Fairfield, CT, United States

General Electric

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Fairfield, CT, United States

General Electric is an American multinational conglomerate corporation incorporated in New York and headquartered in Fairfield, Connecticut. The company operates through the following segments: Energy , Technology Infrastructure, Capital Finance as well as Consumer and Industrial.In 2011, GE ranked among the Fortune 500 as the 26th-largest firm in the U.S. by gross revenue, as well as the 14th most profitable. However, the company is listed the fourth-largest in the world among the Forbes Global 2000, further metrics being taken into account. Other rankings for 2011/2012 include No. 7 company for leaders , No. 5 best global brand , No. 63 green company , No. 15 most admired company , and No. 19 most innovative company . Wikipedia.

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Patent
General Electric | Date: 2017-01-04

Systems 100 and methods 500 for controlling the state of charge of an energy storage system 200 used in conjunction with a renewable energy source or other power generation system are provided. More particularly, a future output requirement of the energy storage system 200 can be predicted based at least in part on data indicative of anticipated conditions, such as weather conditions, wake conditions, or other suitable conditions. A control system 250 can adjust a state of charge setpoint from a nominal setpoint (e.g. 50%) to an adjusted setpoint based at least in part on the future output requirement. In this way, the energy storage system 200 can better accommodate the output requirements of the energy storage system 200 during varying weather conditions.

Claims which contain your search:

1. A method (500) for controlling an energy storage system (200) associated with a power generation system (100), comprising:accessing (502), by one or more control devices (250), data indicative of anticipated conditions for a predetermined time period;determining (504), by the one or more control devices, a future output requirement of the energy storage system for the predetermined time period based at least in part on the data indicative of the anticipated weather conditions;adjusting (506), by the one or more control devices, a state of charge setpoint for the energy storage system based at least in part on the future output requirement; andcontrolling (512), by the one or more control devices, the delivery of power to or from the energy storage system based at least in part on the state of charge setpoint.

4. The method (500) of claim 3, wherein the adjusted setpoint is greater than the nominal setpoint when the future output requirement is determined to be increased relative to a current output requirement of the energy storage system.

5. The method (500) of any preceding claim, wherein controlling (512), by the one or more control devices, the delivery of power to or from the energy storage system (200) comprises:receiving (508), by the one or more computing devices, a signal indicative of the current state of charge of the energy storage system; andgenerating (510), by the one or more computing devices, a power command for the power generation system based at least in part on the signal indicative of the current state of charge of the energy storage system and the state of charge setpoint.

6. The method (500) of claim 5, wherein the power command is determined based at least in part on a maximum output power for the power generation system (100) when the state of charge setpoint is greater than the current state of charge of the energy storage system.

7. The method (500) of any preceding claim, wherein controlling (512|), by the one or more control devices, the delivery of power to or from the energy storage system (200) comprises delivering power generated by the power generation system that is in excess of an output power requirement for the power generation system during the predetermined time period to the energy storage system to increase the state of charge of the energy storage system.

10. The method (500) of any preceding claim, wherein the energy storage system (200) comprises a battery energy storage system.

11. A control system (250) for controlling an energy storage system (200) associated with a renewable energy system (100), the control system (250) comprising:a state of charge adjustment module (310) implemented by one or more control devices, the state of charge adjustment module configured to adjust a state of charge setpoint for the energy storage system based at least in part on data indicative of anticipated weather conditions;a renewable energy control module (320) implemented by the one or more control devices, the renewable energy control module configured to generate a power command for the renewable energy system based at least in part on the state of charge setpoint and a current state of charge for the energy storage system; anda charge control module (330) implemented by the one or more control devices, the charge controller configured to control the delivery of power to or from the energy storage system based at least in part on the state of charge setpoint.

12. The control system (250) of claim 11, wherein the state of charge adjustment module is configured to adjust the state of charge setpoint to accommodate a future output requirement of the energy storage system (200).

13. The control system (250) of claim 11 or claim 12, wherein the state of charge adjustment module (310) is configured to adjust the state of charge setpoint from a nominal setpoint to an adjusted setpoint, the adjusted setpoint being greater than the nominal setpoint when the future output requirement of the energy storage system is greater than a current output requirement of the energy storage system.

14. The control system (250) of any of claims 11 to 13, wherein the renewable energy control module (320) is configured to generate the power command based at least in part on a maximum output power for the renewable energy system when the state of charge setpoint is greater than the current state of charge of the energy storage system.

15. A wind turbine system (100), comprising:a wind driven generator (106);a power converter (162) coupled to the wind driven generator, the power converter comprising a DC bus;a battery energy storage system (200) coupled to the DC bus of the power converter, the battery energy storage system comprising one or more battery cells;a control system (250) configured to control the delivery of power to or from the battery energy storage system (250) based at least in part on a state of charge setpoint;wherein the control system (250) is configured to adjust the state of charge setpoint for the battery energy storage system (200) based at least in part on data indicative of anticipated weather conditions for a predetermined time period.


InteGrids vision is to bridge the gap between citizens, technology and the other players of the energy system. The project will demonstrate how DSOs may enable all stakeholders to actively participate in the energy market and distribution grid management and develop and implement new business models, making use of new data management and consumer involvement approaches. Moreover, the consortium will demonstrate scalable and replicable solutions in an integrated environment that enables DSOs to plan and operate the network with a high share of DRES in a stable, secure and economic way, using flexibility inherently offered by specific technologies and by interaction with different stakeholders. To achieve these objectives, a complementary partnership covering the distribution system value chain has been established. The consortium includes three DSOs from different countries and their retailers, innovative ICT companies and equipment manufacturers as well as customers, a start-up in the area of community engagement and excellent R&D institutions. InteGrids concepts and approaches are based on the these two elements: 1. the role of the DSO as system optimiser and as market facilitator and 2. the integration of existing demonstration activities in three different regions allowing to move from single solutions to an integrated management at a higher scale while focusing on the scalability and replicability considering current and evolving market (and regulatory) conditions. The three conceptual pillars proactive operational planning with DER, business models for flexible DER, information exchange between different power system actors offer an opportunity to maximize the economic, societal and environmental gains from the combined integration of DRES and flexible DER. A market hub platform coupled with smart grid functions and innovative business models will open opportunities for new services and an effective roll-out of emerging technologies in the short-term.


Grant
Agency: European Commission | Branch: H2020 | Program: MSCA-ITN-ETN | Phase: MSCA-ITN-2015-ETN | Award Amount: 3.53M | Year: 2015

The continuous increase of the share of renewable energy sources is redefining the electrical networks. In future infrastructures, an important number of agents (sources, storage devices and consumers) will have intelligent interfaces allowing the regulation of the injection and extraction of power into the grid. This context will create multiple alternatives to increase the efficiency in electricity generation and consumption, to reduce energy costs and to provide a more reliable operation of electrical grids. These future networks will be only possible with suitable control algorithms. INCITE is a multi-sectoral consortium gathering experts on control and power systems, from academia and industry with the purpose of providing innovative control solutions for the future electrical networks.


Soloveichik G.L.,General Electric
Annual Review of Chemical and Biomolecular Engineering | Year: 2011

In recent years, with the deployment of renewable energy sources, advances in electrified transportation, and development in smart grids, the markets for large-scale stationary energy storage have grown rapidly. Electrochemical energy storage methods are strong candidate solutions due to their high energy density, flexibility, and scalability. This review provides an overview of mature and emerging technologies for secondary and redox flow batteries. New developments in the chemistry of secondary and flow batteries as well as regenerative fuel cells are also considered. Advantages and disadvantages of current and prospective electrochemical energy storage options are discussed. The most promising technologies in the short term are high-temperature sodium batteries with β″-alumina electrolyte, lithium-ion batteries, and flow batteries. Regenerative fuel cells and lithium metal batteries with high energy density require further research to become practical. © Copyright 2011 by Annual Reviews. All rights reserved.

Document Keywords (matching the query): high energy physics, energy storage, renewable energy source, electrochemical energy storage, high energy densities.


Patent
General Electric | Date: 2013-12-20

An energy storage system for use in a renewable energy power system is provided. More particularly, an energy storage system can be coupled to the DC bus of a power converter in a renewable energy power system. A switching power supply can be coupled between the energy storage device and the DC bus of the power converter. The switching power supply can include a bi-directional resonant DC to DC converter. The bi-directional resonant converter can include a plurality of switching elements, a resonant circuit coupled to the at least one switching element, and a filtering circuit coupled to the resonant circuit. The bi-directional resonant converter can be configured to accommodate power flow in at least two directions.

Claims which contain your search:

1. A renewable energy power system, comprising: a power converter having a DC bus; an energy storage system coupled to the DC bus of the power converter, the energy storage system comprising an energy storage device and a switching power supply coupled between the energy storage device and the DC bus of the power converter; and a control system configured to operate the energy storage system in a first mode where power flows in a first direction from the DC bus to the energy storage device and in a second mode where power flows in a second direction from the energy storage device to the DC bus; wherein the switching power supply comprises a bi-directional resonant DC to DC power converter, the bi-directional resonant DC to DC power converter configured to accommodate bi-directional power flow between the energy storage device and the DC bus.

2. The renewable energy system of claim 1, wherein the bi-directional resonant DC to DC power converter comprises a plurality of switching elements, a resonant circuit coupled to the plurality of switching elements, and a filtering circuit coupled to the at least one resonant circuit.

3. The renewable energy system of claim 2, wherein the plurality of switching elements comprise a first switching element and a second switching element coupled in series with another, the resonant circuit being coupled to a node between the first switching element and the second switching element.

4. The renewable energy system of claim 3, wherein the first switching element is a first insulated gate bipolar transistor having a gate, a collector, and an emitter, the second switching element is a second insulated gate bipolar transistor having a gate, collector, and an emitter, wherein the collector of the first switching element is coupled to a positive terminal of the DC bus, the emitter of the first switching element is coupled to the collector of the second insulated gate bipolar transistor, and the emitter of the second switching element is coupled to a negative terminal of the DC bus.

5. The renewable energy system of claim 4, wherein the first switching element is coupled in parallel with a first diode and the second switching element is coupled in parallel with a second diode.

6. The renewable energy system of claim 3, wherein the resonant circuit comprises a first LC circuit having a first inductor and a first capacitor, the first inductor coupled to the node between the first switching element and the second switching element, the first capacitor coupled between the first inductor and a negative terminal of the DC bus.

7. The renewable energy system of claim 6, wherein the filtering circuit comprises a second LC circuit having a second inductor and a second capacitor, wherein the second inductor is coupled to a node between the first inductor and the first capacitor and the second capacitor is coupled between the second inductor and the negative terminal of the DC bus.

8. The renewable energy system of claim 2, wherein the control system is configured to coordinate the switching of the first switching element or the second switching element with zero current crossings of a current flowing in the respective switching element.

9. The renewable energy system of claim 1, wherein the resonant DC to DC power converter is a buck converter, boost converter, zero current switching (ZCS) converter, zero voltage switching (ZVS) converter, or a buck-boost converter.

10. The renewable energy system of claim 1, wherein the DC bus is coupled between an AC to DC converter and a DC to AC converter in a wind power system.

11. The renewable energy system of claim 1, wherein the DC bus is coupled between a DC to DC converter and an AC to DC converter in a solar power system.

16. A method of operating an energy storage system, comprising: selecting operation of the energy storage system in a first mode; providing power from a DC bus to an energy storage device via a bi-directional resonant DC to DC converter coupled between the DC bus and the energy storage device; and controlling the bi-directional resonant DC to DC converter such that power flows in a first direction from the DC bus to the energy storage device; wherein the bi-directional resonant DC to DC power converter is configured to accommodate bi-directional power flow between the energy storage device and the DC bus

17. The method of claim 16, wherein the method further comprises selecting operation of the energy storage system in a second mode; providing power from energy storage device to the DC bus via the bi-directional resonant DC to DC converter coupled between the DC bus and the energy storage device; and controlling the bi-directional resonant DC to DC converter such that power flows in a second direction from the energy storage device to the DC bus.

19. The method of claim 18, wherein controlling the bi-directional resonant DC to DC converter such that power flows in a first direction from the DC bus to the energy storage device comprises coordinating the switching of the first switching element with zero current crossings of a current flowing in the first switching element.

20. The method of claim 18, wherein controlling the bi-directional resonant DC to DC converter such that power flows in a second direction from the energy storage system to the DC bus comprises coordinating the switching of the second switching element with zero current crossings of a current flowing in the second switching element.


Patent
General Electric | Date: 2015-07-01

An energy storage system 200 for use in a renewable energy power system 100 is provided. More particularly, an energy storage system 200 can be coupled to the DC bus 136 of a power converter 162 in a renewable energy power system 100. A switching power supply 220 can be coupled between the energy storage device 210 and the DC bus 136 of the power converter 162. The switching power supply 220 can include a bi-directional resonant DC to DC converter 420. The bi-directional resonant converter 420 can include a plurality of switching elements, a resonant circuit 330 coupled to the at least one switching element, and a filtering circuit 340 coupled to the resonant circuit 330. The bi-directional resonant converter 420 can be configured to accommodate power flow in at least two directions.

Claims which contain your search:

1. A renewable energy power system (100), comprising:a power converter (162) having a DC bus (136);an energy storage system (200) coupled to the DC bus (136) of the power converter (162), the energy storage system (200) comprising an energy storage device and a switching power supply (220) coupled between the energy storage device (210) and the DC bus of the power converter (162); anda control system (174) configured to operate the energy storage system (200) in a first mode where power flows in a first direction from the DC bus (136) to the energy storage device (210) and in a second mode where power flows in a second direction from the energy storage device (210) to the DC bus (136);wherein the switching power supply (220) comprises a bi-directional resonant DC to DC power converter (420), the bi-directional resonant DC to DC power converter configured to accommodate bi-directional power flow between the energy storage device (210) and the DC bus (136).

2. The renewable energy system (100) of claim 1, wherein the bi-directional resonant DC to DC power converter (420) comprises a plurality of switching elements, a resonant circuit (330) coupled to the plurality of switching elements, and a filtering circuit (340) coupled to the at least one resonant circuit (330).

3. The renewable energy system (100) of any preceding claim, wherein the plurality of switching elements comprise a first switching element and a second switching element coupled in series with another, the resonant circuit being coupled to a node between the first switching element and the second switching element.

4. The renewable energy system (100) of any preceding claim, wherein the first switching element is a first insulated gate bipolar transistor having a gate, a collector, and an emitter, the second switching element is a second insulated gate bipolar transistor having a gate, collector, and an emitter, wherein the collector of the first switching element is coupled to a positive terminal of the DC bus (136), the emitter of the first switching element is coupled to the collector of the second insulated gate bipolar transistor, and the emitter of the second switching element is coupled to a negative terminal of the DC bus.

5. The renewable energy system (100) of any preceding claim, wherein the first switching element is coupled in parallel with a first diode (324) and the second switching element is coupled in parallel with a second diode.

6. The renewable energy system (100) of any preceding claim, wherein the resonant circuit (330) comprises a first LC circuit having a first inductor and a first capacitor, the first inductor coupled to the node between the first switching element and the second switching element, the first capacitor coupled between the first inductor and a negative terminal of the DC bus.

7. The renewable energy system (100) of any preceding claim, wherein the filtering circuit (340) comprises a second LC circuit having a second inductor and a second capacitor, wherein the second inductor is coupled to a node between the first inductor and the first capacitor and the second capacitor is coupled between the second inductor and the negative terminal of the DC bus.

8. The renewable energy system (100) of any preceding claim, wherein the control system (174) is configured to coordinate the switching of the first switching element or the second switching element with zero current crossings of a current flowing in the respective switching element.

9. The renewable energy system (100) of any preceding claim, wherein the resonant DC to DC power converter (420) is a buck converter, boost converter, zero current switching (ZCS) converter, zero voltage switching (ZVS) converter, or a buck-boost converter.

11. A method of operating an energy storage system (200), comprising:selecting operation of the energy storage system (200) in a first mode;providing power from a DC bus (136) to an energy storage device (210) via a bi-directional resonant DC to DC converter (162) coupled between the DC bus and the energy storage device; andcontrolling the bi-directional resonant DC to DC converter (420) such that power flows in a first direction from the DC bus (136) to the energy storage device (210);wherein the bi-directional resonant DC to DC power converter (162) is configured to accommodate bi-directional power flow between the energy storage device and the DC bus

12. The method of claim 11, wherein the method further comprisesselecting operation of the energy storage system (200) in a second mode;providing power from energy storage device (210) to the DC bus (136) via the bi-directional resonant DC to DC converter (162) coupled between the DC bus and the energy storage device; andcontrolling the bi-directional resonant DC to DC converter (162) such that power flows in a second direction from the energy storage device (210) to the DC bus (136).

14. The method of any of claims 11 to 13, wherein controlling the bi-directional resonant DC to DC converter (420) such that power flows in a first direction from the DC bus (136) to the energy storage device (210) comprises coordinating the switching of the first switching element with zero current crossings of a current flowing in the first switching element.

15. The method of any of claims 11 to 14, wherein controlling the bi-directional resonant DC to DC converter (420) such that power flows in a second direction from the energy storage system (200) to the DC bus (136) comprises coordinating the switching of the second switching element with zero current crossings of a current flowing in the second switching element.


Patent
General Electric | Date: 2015-07-01

Systems and methods for controlling the state of charge of an energy storage system used in conjunction with a renewable energy source or other power generation system are provided. More particularly, a future output requirement of the energy storage system can be predicted based at least in part on data indicative of anticipated conditions, such as weather conditions, wake conditions, or other suitable conditions. A control system can adjust a state of charge setpoint from a nominal setpoint (e.g. 50%) to an adjusted setpoint based at least in part on the future output requirement. In this way, the energy storage system can better accommodate the output requirements of the energy storage system during varying weather conditions.

Claims which contain your search:

1. A method for controlling an energy storage system associated with a power generation system, comprising: accessing, by one or more control devices, data indicative of anticipated conditions for a predetermined time period; determining, by the one or more control devices, a future output requirement of the energy storage system for the predetermined time period based at least in part on the data indicative of the anticipated weather conditions; adjusting, by the one or more control devices, a state of charge setpoint for the energy storage system based at least in part on the future output requirement; and controlling, by the one or more control devices, the delivery of power to or from the energy storage system based at least in part on the state of charge setpoint.

4. The method of claim 3, wherein the adjusted setpoint is greater than the nominal setpoint when the future output requirement is determined to be increased relative to a current output requirement of the energy storage system.

5. The method of claim 1, wherein controlling, by the one or more control devices, the delivery of power to or from the energy storage system comprises: receiving, by the one or more computing devices, a signal indicative of the current state of charge of the energy storage system; and generating, by the one or more computing devices, a power command for the power generation system based at least in part on the signal indicative of the current state of charge of the energy storage system and the state of charge setpoint.

6. The method of claim 5, wherein the power command is determined based at least in part on a maximum output power for the power generation system when the state of charge setpoint is greater than the current state of charge of the energy storage system.

7. The method of claim 1, wherein controlling, by the one or more control devices, the delivery of power to or from the energy storage system comprises delivering power generated by the power generation system that is in excess of an output power requirement for the power generation system during the predetermined time period to the energy storage system to increase the state of charge of the energy storage system.

10. The method of claim 8, wherein the energy storage system comprises a battery energy storage system.

11. A control system for controlling an energy storage system associated with a renewable energy system, the control system comprising: a state of charge adjustment module implemented by one or more control devices, the state of charge adjustment module configured to adjust a state of charge setpoint for the energy storage system based at least in part on data indicative of anticipated weather conditions; a renewable energy control module implemented by the one or more control devices, the renewable energy control module configured to generate a power command for the renewable energy system based at least in part on the state of charge setpoint and a current state of charge for the energy storage system; and a charge control module implemented by the one or more control devices, the charge controller configured to control the delivery of power to or from the energy storage system based at least in part on the state of charge setpoint.

12. The control system of claim 11, wherein the state of charge adjustment module is configured to adjust the state of charge setpoint to accommodate a future output requirement of the energy storage system.

13. The control system of claim 12, wherein the state of charge adjustment module is configured to adjust the state of charge setpoint from a nominal setpoint to an adjusted setpoint, the adjusted setpoint being greater than the nominal setpoint when the future output requirement of the energy storage system is greater than a current output requirement of the energy storage system.

14. The control system of claim 11, wherein the renewable energy control module is configured to generate the power command based at least in part on a maximum output power for the renewable energy system when the state of charge setpoint is greater than the current state of charge of the energy storage system.

15. A wind turbine system, comprising: a wind driven generator; a power converter coupled to the wind driven generator, the power converter comprising a DC bus; a battery energy storage system coupled to the DC bus of the power converter, the battery energy storage system comprising one or more battery cells; a control system configured to control the delivery of power to or from the battery energy storage system based at least in part on a state of charge setpoint; wherein the control system is configured to adjust the state of charge setpoint for the battery energy storage system based at least in part on data indicative of anticipated weather conditions for a predetermined time period.

16. The wind turbine system of claim 15, wherein the control system is configured to adjust the state of charge setpoint to accommodate a future output requirement of the battery energy storage system during the predetermined time period, the future output requirement being determined based at least in part on the data indicative of anticipated weather conditions.

19. The wind turbine system of claim 15, wherein the control system is configured to control energy production by the wind driven generator based at least in part on a maximum output power for the wind driven generator when a current state of charge of the battery energy storage system is less than the state of charge setpoint.

20. The wind turbine system of claim 15, wherein the control system is configured to deliver power generated by the wind generator that is in excess of an output power requirement for the renewable energy system during the predetermined time period to the battery energy storage system to increase the state of charge of the battery energy storage system


Systems and methods 600 for controlling a renewable energy system 200 based on actual reactive power capability of the renewable energy system are provided. The reactive power output of the renewable energy system 200 can be controlled based at least in part on an initial reactive power limit. The initial reactive power limit can be determined based on rated reactive power for the power generation units 202 in the renewable energy system 200. When a difference between a reactive power demand and the actual reactive power production of the renewable energy system fall outside a threshold, the initial reactive power limit can be adjusted to a corrected reactive power limit that is closer to the actual reactive power capability of the renewable energy system.

Claims which contain your search:

1. A method (600) for controlling a renewable energy system (200), comprising:controlling (602), by one or more control devices, a reactive power output for a renewable energy system (200) based at least in part on an initial reactive power limit for the renewable energy system;determining (604), by the one or more control devices, a difference between a reactive power demand and an actual reactive power production for the renewable energy system (200);wherein when the difference falls outside a threshold, the method comprises:determining (608), by the one or more control devices, a correction factor for the initial reactive power limit;adjusting (610), by the one or more control devices (360), the initial reactive power limit to a corrected reactive power limit based at least in part on the correction factor; andcontrolling (612), by the one or more control devices, the reactive power output for the renewable energy system (200) based at least in part on the corrected reactive power limit.

3. The method (600) of any preceding claim, wherein the initial reactive power limit is determined by aggregating a rated reactive power for each of a plurality of power generation units (202) in the renewable energy system (200).

4. The method (600) of any preceding claim, wherein the correction factor results in adjusting the initial reactive power limit towards the actual reactive power capability of the renewable energy system (200).

7. The method (600) of any preceding claim, wherein the threshold comprises 5% of rated reactive power for the renewable energy system (200).

8. The method (600) of any preceding claim, wherein the corrected reactive power limit is used to limit a reactive power command for the renewable energy system (200).

10. A control system for controlling a renewable energy system (200), the control system comprising:a voltage regulator (310) implemented by one or more control devices (360), the voltage regulator (310) configured to provide a reactive power command based at least in part on a voltage error signal;a limiter implemented by the one or more control devices (360), the limiter configured to limit the reactive power command based at least in part on an initial reactive power limit for the renewable energy system (200);a reactive power limit correction module implemented by the one or more control devices (360), the reactive power limit correction module configured to adjust the initial reactive power limit to a corrected reactive power limit when a difference between the reactive power command for the renewable energy system (200) and an actual reactive power production for the renewable energy system (200) falls outside of a threshold;wherein the corrected reactive power limit corrects the initial reactive power limit towards the actual reactive power capability of the renewable energy system (200).

11. The control system of claim 10, the initial reactive power limit is determined by aggregating a rated reactive power for each of a plurality of power generation units (202) in the renewable energy system (200).

12. The control system of claim 10 or claim 11, wherein the threshold comprises 5% of rated reactive power for the renewable energy system (200).

13. The control system of any of claims 10 to 12, wherein the corrected reactive power limit is determined based at least in part on a correction factor, the correction factor determined based on the difference between the reactive power demand for the renewable energy system (200) and the actual reactive power production for the renewable energy system (200).

14. The control system of any of claims 10 to 13, wherein the reactive power command is determined based at least in part on a power factor setpoint for the renewable energy system (200).


Patent
General Electric | Date: 2014-04-15

Renewable energy power systems, DC to DC converters, and methods for operating energy storage systems are provided. A system includes a power converter having a DC bus, and an energy storage system coupled to the DC bus of the power converter. The energy storage system includes an energy storage device and a switching power supply coupled between the energy storage device and the DC bus of the power converter. The switching power supply includes a plurality of switching elements, and an energy storage device protection circuit coupled between the plurality of switching elements and the energy storage device, the energy storage device protection circuit including a solid state switch. The switching power supply further includes a fuse coupled to the energy storage device protection circuit.

Claims which contain your search:

1. A renewable energy power system, comprising: a power converter having a DC bus; an energy storage system coupled to the DC bus of the power converter, the energy storage system comprising an energy storage device and a switching power supply coupled between the energy storage device and the DC bus of the power converter, the switching power supply comprising:a plurality of switching elements;an energy storage device protection circuit coupled between the plurality of switching elements and the energy storage device, the energy storage device protection circuit comprising a solid state switch; anda fuse coupled to the energy storage device protection circuit.

2. The renewable energy power system of claim 1, wherein the energy storage device protection circuit further comprises an antiparallel diode coupled in parallel with the solid state switch.

3. The renewable energy power system of claim 1, wherein the energy storage device protection circuit further comprises a resistor coupled in series with the solid state switch.

4. The renewable energy power system of claim 1, wherein the solid state switch is a silicon-controlled rectifier.

5. The renewable energy power system of claim 1, wherein the plurality of switching elements comprise a first switching element and a second switching element coupled in series with one another.

6. The renewable energy power system of claim 5, wherein the fuse is coupled to a node between the first switching element and the second switching element.

7. The renewable energy power system of claim 5, wherein the fuse is coupled to a positive terminal of the DC bus.

8. The renewable energy power system of claim 1, wherein the energy storage device comprises a battery module, the battery module comprising a first switch, a battery, a second switch, and a fuse coupled in series to the first switch.

9. The renewable energy power system of claim 1, wherein the switching power supply further comprises a normal mode filter coupled between the plurality of switching elements and the energy storage device protection circuit, and a common mode filter coupled between the normal mode filter and the energy storage device protection circuit.

10. A DC to DC power converter comprising: a first transistor having a gate, a collector, and an emitter; a second transistor having a gate, a collector, and an emitter, the collector of the second transistor being coupled to the emitter of the first transistor; an energy storage device protection circuit, the energy storage device protection circuit comprising a solid state switch and an antiparallel diode coupled in parallel with one another; and a plurality of fuses coupled to the energy storage device protection circuit.

15. The DC to DC power converter of claim 10, wherein the energy storage device protection circuit further comprises a resistor coupled in series with the solid state switch and the antiparallel diode.

16. The DC to DC power converter of claim 10, further comprising a normal mode filter coupled between the first and second transistors and the energy storage device protection circuit, and a common mode filter coupled between the normal mode filter and the energy storage device protection circuit.

17. A method of operating an energy storage system, the method comprising: providing power between a DC bus and an energy storage device via a DC to DC converter coupled between the DC bus and the energy storage device; firing a solid state switch of the DC to DC converter when an overvoltage event occurs; and providing a path for current flow through an antiparallel diode of the DC to DC converter when a negative voltage event occurs, the antiparallel diode coupled in parallel with the solid state switch.


Patent
General Electric | Date: 2015-02-18

Systems and methods for controlling a renewable energy system based on actual reactive power capability of the renewable energy system are provided. The reactive power output of the renewable energy system can be controlled based at least in part on an initial reactive power limit. The initial reactive power limit can be determined based on rated reactive power for the power generation units in the renewable energy system. When a difference between a reactive power demand and the actual reactive power production of the renewable energy system fall outside a threshold, the initial reactive power limit can be adjusted to a corrected reactive power limit that is closer to the actual reactive power capability of the renewable energy system.

Claims which contain your search:

1. A method for controlling a renewable energy system, comprising: controlling, by one or more control devices, a reactive power output for a renewable energy system based at least in part on an initial reactive power limit for the renewable energy system; determining, by the one or more control devices, a difference between a reactive power demand and an actual reactive power production for the renewable energy system; wherein when the difference falls outside a threshold, the method comprises:determining, by the one or more control devices, a correction factor for the initial reactive power limit;adjusting, by the one or more control devices, the initial reactive power limit to a corrected reactive power limit based at least in part on the correction factor; andcontrolling, by the one or more control devices, the reactive power output for the renewable energy system based at least in part on the corrected reactive power limit; detecting, by the one or more control devices, the difference returning to within the threshold; and in response to detecting the difference returning to within the threshold, controlling, by the one or more control devices, the reactive power output based at least in part on the initial reactive power limit.

3. The method of claim 1, wherein the initial reactive power limit is determined by aggregating a rated reactive power for each of a plurality of power generation units in the renewable energy system.

4. The method of claim 1, wherein the correction factor results in adjusting the initial reactive power limit towards the actual reactive power capability of the renewable energy system.

7. The method of claim 1, wherein the threshold comprises 5% of rated reactive power for the renewable energy system.

8. The method of claim 1, wherein the corrected reactive power limit is used to limit a reactive power command for the renewable energy system.

10. A control system for controlling a renewable energy system, the control system comprising: a voltage regulator implemented by one or more control devices, the voltage regulator configured to provide a reactive power command based at least in part on a voltage error signal; a limiter implemented by the one or more control devices, the limiter configured to limit the reactive power command based at least in part on an initial reactive power limit for the renewable energy system; a reactive power limit correction module implemented by the one or more control devices, the reactive power limit correction module configured to adjust the initial reactive power limit to a corrected reactive power limit when a difference between the reactive power command for the renewable energy system and an actual reactive power production for the renewable energy system falls outside of a threshold, and wherein the reactive power limit correction module is configured to detect the difference returning to within the threshold, and in response to detecting the difference returning to within the threshold, control the reactive power output based at least in part on the initial reactive power limit; wherein the corrected reactive power limit corrects the initial reactive power limit towards the actual reactive power capability of the renewable energy system.

11. The control system of claim 10, the initial reactive power limit is determined by aggregating a rated reactive power for each of a plurality of power generation units in the renewable energy system.

12. The control system of claim 10, wherein the threshold comprises 5% of rated reactive power for the renewable energy system.

13. The control system of claim 10, wherein the corrected reactive power limit is determined based at least in part on a correction factor, the correction factor determined based on the difference between the reactive power demand for the renewable energy system and the actual reactive power production for the renewable energy system.

14. The control system of claim 10, wherein the reactive power command is determined based at least in part on a power factor setpoint for the renewable energy system.

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