North China Electrical Power University

www.ncepu.edu.cn
Baoding, China

North China Electric Power University is a university based in Beijing, People's Republic of China under the national Ministry of Education that specializes in polytechnic disciplines. Wikipedia.

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Li P.,North China Electrical Power University | Yu X.,North China Electrical Power University | Zhang J.,J and P Renewable Engineering Co. | Yin Z.,North China Electrical Power University
IEEE Transactions on Smart Grid | Year: 2015

Microgrid allows high penetration of renewable energy sources, and provides technical foundation for the grid connection and operation of distributed generations (DGs). The negative impacts caused by DGs should be reduced inside the microgrid. Photovoltaic (PV) generation is one of the major distributed energy sources, and the performance of PV generation systems connected to microgrid directly affects power quality and other technical indexes of the microgrid. Thus, the research of flexible microgrid connection control for PV generation system has both theoretical significance and practical value. This paper makes a concise exposition on the H∞ control theory and applies this theory to the flexible microgrid connection control for PV generation systems. This paper focuses on the specific situation where the microgrid is grid tied to the main power grid. We establish the mathematical model of PV generation system and adopt the H∞ control theory to design a voltage tracking controller. Theoretical analysis proved that our control system is internally stable. Simulations under six different conditions are performed using MATLAB/Simulink, and the results demonstrate that the grid-tied PV generation system using H∞ controller has high control accuracy and robustness. © 2010-2012 IEEE.

Document Keywords (matching the query): renewable energy resources, photovoltaic generation, renewable energy source, distributed energy sources, distributed generations dgs.


Ma J.,North China Electrical Power University | Wang X.,North China Electrical Power University | Zhang Y.,North China Electrical Power University | Yang Q.,North China Electrical Power University | Phadke A.G.,University of Virginia
International Journal of Electrical Power and Energy Systems | Year: 2012

An adaptive current protection scheme is proposed for the protection of power systems with penetration of distributed generation (DG). In this scheme, steady state fault current of the related power transmission lines is derived from steady state network equivalent reduction. Then, settings criteria for adaptive primary and backup protection are established on the basis of the steady state fault current. The simulated results of a realistic power network verify the ranges of adaptive primary and backup protection are immune to implementation of DG and the fault types. Furthermore, compared with traditional current protection schemes, the proposed method has extended the primary and backup protection regions considerably. © 2012 Elsevier Ltd. All rights reserved.

Document Keywords (matching the query): distributed generation, energy resources, distributed power generation.


Patent
State Grid Corporation of China, North China Electrical Power University and STATE GRID LIAONING Electrical POWER COMPANY Ltd ECONOMIC RESEARCH INSTITUTE | Date: 2014-07-26

A renewable energy-based hybrid bi-directionally interactive DC traction power supply system includes two traction substations. Each substation includes transformers, rectifiers, bidirectional AC-DC converters, a DC bus, a catenary, a steel rail and a section post. A DC bus between two adjacent traction substations is provided with a DC renewable energy system constructed by an electric vehicle charging-discharging system, a distributed generation and more than one low voltage DC microgrid. The DC renewable energy system is connected to the DC bus between two adjacent traction substations through a high voltage DC bus, thus a DC circular microgrid being formed in a power supply section post. The electric vehicle charging-discharging system is formed by more than one bidirectional DC-DC charging-discharging equipments which are intended for in connection with the power batteries of the electric vehicle. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system of the invention realizes effective usage of distributed generation and recycling of electric locomotive braking energy, reducing DC voltage fluctuation, thus improving reliability of the DC traction power supply system.

Claims which contain your search:

1. A renewable energy-based hybrid bi-directionally interactive DC traction power supply system comprising at least two traction substations ( 1) for supplying DC energy to an electric locomotive ( 2), wherein each traction substation ( 1) has more than one first transformer ( 11) connected to a AC bus ( 5) and more than one second transformer ( 17) connected to the AC bus ( 5); the other end of each first transformer ( 11) is correspondingly coupled to a rectifier ( 12), and the other end of each second transformer ( 17) is correspondingly coupled to a bidirectional AC-DC converter ( 18); the other end of each rectifier ( 12) and bidirectional AC-DC converter ( 18) is coupled to a DC bus ( 13) of a corresponding traction substation ( 1); the positive and negative ends of the DC bus ( 13) are connected to a catenary ( 14) and steel rail ( 15) respectively; the positive and negative ends of the electric locomotive ( 2) are connected to the catenary ( 14) and steel rail ( 15) respectively; the catenary ( 14) of each traction substation ( 1) is coupled with a section post 16; the both ends of the section post 16 are connected to positive end of a corresponding DC bus ( 13); a DC bus ( 13) between two adjacent traction substations ( 1) is provided with a DC renewable energy system ( 3) constructed by an electric vehicle charging-discharging system, a distributed generation and more than one low voltage DC microgrid ( 31); the DC renewable energy system ( 3) is connected to the DC bus ( 13) between two adjacent traction substations ( 1) through a high voltage DC bus ( 4), thus a DC circular microgrid being formed in a power supply section post, and wherein the electric vehicle charging-discharging system is formed by more than one bidirectional DC-DC charging-discharging equipments ( 32) which are intended for in connection with the power batteries of the electric vehicle.

3. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system as recited in claim 1, wherein the distributed generation includes more than one micro gas turbine ( 33), more than one wind turbine generator 35, more than one fuel cell ( 37), and more than one solar photovoltaic cell ( 39); each of the micro gas turbine ( 33) and wind turbine generator 35 is connected respectively to the high voltage DC bus ( 4) by a unidirectional AC-DC converter ( 34/ 36); and each of the fuel cell ( 37) and solar photovoltaic cell ( 39) is connected respectively to the high voltage DC bus ( 4) by a unidirectional DC-DC converter ( 38/ 40).

4. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system as recited in claim 1, wherein the low voltage DC microgrid ( 31) comprises a circular low voltage DC bus ( 311 a) connected to the high voltage DC bus ( 4) via a bidirectional DC-DC converter ( 312), more than one energy storage device ( 3110), more than one micro gas turbine ( 316), more than one solar photovoltaic cell ( 317), more than one fuel cell ( 318), more than one wind turbine generator ( 319), more than one unidirectional DC-AC converter ( 3111), more than one bidirectional DC-DC charging-discharging equipment ( 3112), and more than one unidirectional DC-DC converter ( 3113); each of the solar photovoltaic cell ( 317) and fuel cell ( 318) is connected respectively to the circular low voltage DC bus ( 311 a) by a unidirectional DC-DC converter ( 3117/ 3116); each of the micro gas turbine ( 316) and wind turbine generator ( 319) is connected respectively to the circular low voltage DC bus ( 311 a) by a unidirectional AC-DC converter ( 3114/ 3115); each energy storage device ( 3110) is connected to the circular low voltage DC bus ( 311 a) through a bidirectional DC-DC converter ( 3118); an output end of each unidirectional DC-AC converter ( 3111) is connected to an AC load ( 313); the other end of each bidirectional DC-DC charging-discharging equipment ( 3112) is connected to the battery of the electric vehicle ( 314); and an output end of each unidirectional DC-DC converter ( 3113) is connected to a DC load ( 315).

5. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system as recited in claim 1, wherein the low voltage DC microgrid ( 31) comprises a radial low voltage DC bus ( 311 b) connected to the high voltage DC bus ( 4) via a bidirectional DC-DC converter ( 312), more than one energy storage device ( 3110), more than one micro gas turbine ( 316), more than one solar photovoltaic cell ( 317), more than one fuel cell ( 318), more than one wind turbine generator ( 319), more than one unidirectional DC-AC converter ( 3111), more than one bidirectional DC-DC charging-discharging equipment ( 3112), and more than one unidirectional DC-DC converter ( 3113); each of the solar photovoltaic cell ( 317) and fuel cell ( 318) is connected respectively to the radial low voltage DC bus ( 311 b) by a unidirectional DC-DC converter ( 3117/ 3116); each of the micro gas turbine ( 316) and wind turbine generator ( 319) is connected respectively to the radial low voltage DC bus 311 b by a unidirectional AC-DC converter ( 3114/ 3115); each energy storage device ( 3110) is connected to the radial low voltage DC bus ( 311 b) through a bidirectional DC-DC converter ( 3118); an output end of each unidirectional DC-AC converter ( 3111) is connected to an AC load ( 313); the other end of each bidirectional DC-DC charging-discharging equipment ( 3112) is connected to the battery of the electric vehicle ( 314); and an output end of each unidirectional DC-DC converter ( 3113) is connected to a DC load ( 315).

6. A renewable energy-based hybrid bi-directionally interactive DC traction power supply system comprising a traction substations ( 1) for supplying DC energy to an electric locomotive ( 2), wherein each traction substation ( 1) has more than one first transformer ( 11) connected to a AC bus ( 5) and more than one second transformer ( 17) connected to the AC bus ( 5); the other end of each first transformer ( 11) is correspondingly coupled to a rectifier ( 12), and the other end of each second transformer ( 17) is correspondingly coupled to a bidirectional AC-DC converter ( 18); the other end of each rectifier ( 12) and bidirectional AC-DC converter ( 18) is coupled to a DC bus ( 13) of a corresponding traction substation ( 1); the positive and negative ends of the DC bus ( 13) are connected to a catenary ( 14) and steel rail ( 15) respectively; the positive and negative ends of the electric locomotive ( 2) are connected to the catenary ( 14) and steel rail ( 15) respectively; a DC bus ( 13) is provided with a DC renewable energy system ( 3) constructed by an electric vehicle charging-discharging system, a distributed generation and more than one low voltage DC microgrid ( 31); the DC renewable energy system ( 3) is connected to the DC bus ( 13) of the traction substations ( 1) through a high voltage DC bus ( 4), thus a DC circular microgrid being formed in a power supply section post, and wherein the electric vehicle charging-discharging system is formed by more than one bidirectional DC-DC charging-discharging equipments ( 32) which are intended for in connection with the power batteries of the electric vehicle.

8. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system as recited in claim 6, wherein the distributed generation includes more than one micro gas turbine ( 33), more than one wind turbine generator ( 35), more than one fuel cell ( 37), and more than one solar photovoltaic cell ( 39); each of the micro gas turbine ( 33) and wind turbine generator ( 35) is connected respectively to the high voltage DC bus ( 4) by a unidirectional AC-DC converter ( 34/ 36); and each of the fuel cell ( 37) and solar photovoltaic cell ( 39) is connected respectively to the high voltage DC bus ( 4) by a unidirectional DC-DC converter ( 38/ 40).

9. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system as recited in claim 6, wherein the low voltage DC microgrid ( 31) comprises a circular low voltage DC bus ( 311 a) connected to the high voltage DC bus ( 4) via a bidirectional DC-DC converter ( 312), more than one energy storage device ( 3110), more than one micro gas turbine ( 316), more than one solar photovoltaic cell ( 317), more than one fuel cell ( 318), more than one wind turbine generator ( 319), more than one unidirectional DC-AC converter ( 3111), more than one bidirectional DC-DC charging-discharging equipment ( 3112), and more than one unidirectional DC-DC converter ( 3113); each of the solar photovoltaic cell ( 317) and fuel cell ( 318) is connected respectively to the circular low voltage DC bus ( 311 a) by a unidirectional DC-DC converter ( 3117/ 3116); each of the micro gas turbine ( 316) and wind turbine generator ( 319) is connected respectively to the circular low voltage DC bus ( 311 a) by a unidirectional AC-DC converter ( 3114/ 3115); each energy storage device ( 3110) is connected to the circular low voltage DC bus ( 311 a) through a bidirectional DC-DC converter ( 3118); an output end of each unidirectional DC-AC converter ( 3111) is connected to an AC load ( 313); the other end of each bidirectional DC-DC charging-discharging equipment ( 3112) is connected to the battery of the electric vehicle ( 314); and an output end of each unidirectional DC-DC converter ( 3113) is connected to a DC load ( 315).

10. The renewable energy-based hybrid bi-directionally interactive DC traction power supply system as recited in claim 6, wherein the low voltage DC microgrid ( 31) comprises a radial low voltage DC bus ( 311 b) connected to the high voltage DC bus ( 4) via a bidirectional DC-DC converter ( 312), more than one energy storage device ( 3110), more than one micro gas turbine ( 316), more than one solar photovoltaic cell ( 317), more than one fuel cell ( 318), more than one wind turbine generator ( 319), more than one unidirectional DC-AC converter ( 3111), more than one bidirectional DC-DC charging-discharging equipment ( 3112), and more than one unidirectional DC-DC converter ( 3113); each of the solar photovoltaic cell ( 317) and fuel cell ( 318) is connected respectively to the radial low voltage DC bus ( 311 b) by a unidirectional DC-DC converter ( 3117/ 3116); each of the micro gas turbine ( 316) and wind turbine generator ( 319) is connected respectively to the radial low voltage DC bus ( 311 b) by a unidirectional AC-DC converter ( 3114/ 3115); each energy storage device ( 3110) is connected to the radial low voltage DC bus ( 311 b) through a bidirectional DC-DC converter ( 3118); an output end of each unidirectional DC-AC converter ( 3111) is connected to an AC load ( 313); the other end of each bidirectional DC-DC charging-discharging equipment ( 3112) is connected to the battery of the electric vehicle ( 314); and an output end of each unidirectional DC-DC converter ( 3113) is connected to a DC load ( 315).


Yuan J.,North China Electrical Power University | Shen J.,North China Electrical Power University | Pan L.,North China Electrical Power University | Zhao C.,North China Electrical Power University | Kang J.,Nuclear Power Institute of China
Renewable and Sustainable Energy Reviews | Year: 2014

Smart grid is the direction of power system development and it has aroused wide attention. It is also the physical infrastructure to integrate renewable energy into the power system. In China power grid companies are the pioneer in developing smart grids. Propelled by strong demand, China has made encouraging progress in smart grid development, especially in the aspect of ultra-high voltage transmission system. However, in other aspects as distributed generation, microgrid and intelligent demand management etc., the progress is slow and limited. In this paper we analyze the policy, pilot projects, achievements and barriers of developing smart grids in China. We find that lack of a clear national strategy is one main institutional barrier. The current industrial structure of the electric power sector, or the vertical integration of power transmission with distribution and supply, is another institutional barrier. Finally we provide an outlook on smart grid development in China. © 2014 Elsevier Ltd.

Document Keywords (matching the query): renewable energy resources, integrate renewable energies, distributed power generation.


Pingkuo L.,Shanghai University of Electric Power | Pingkuo L.,North China Electrical Power University | Zhongfu T.,North China Electrical Power University
Renewable and Sustainable Energy Reviews | Year: 2016

One purpose of the reformation of electric power system in China is to enable the power system to absorb a higher proportion of renewable energy. Currently, there are still such problems for China's renewable energy as high cost price, poor power regulating ability and insufficient consumptive space. As an important means of developing renewable energy power generation, distributed generation becomes a highlight in this reformation of electric power system. Under the background of reformation in power system, we describe the current overall market situation of distributed generation and the situation of distributed photovoltaic generation in China and further analyze the future policy environment of distributed generation. At the same time, we also analyze the system, technical and economic obstacles in the development of distributed generation. Market designs are made on various aspects like the objective principle, market types (spot market, futures market, financial market, ancillary service market and retail market) and transaction modes (bilateral contract, multilateral transaction platform and power pool). We also build institutional arrangement for smooth transition mechanism, problem-solving mechanism, independent accounting mechanism in power transition and distribution, full acquisition mechanism and Renewable Portfolio Standard. Discussions on the operation mode for the distributed generation are also shown in this paper based on the policies, regulations of the reformation and technical condition (micro-grid). Through our research, we finally put forward five policy proposals to provide support to the development of distributed generation during the reformation. © 2016 Elsevier Ltd

Document Keywords (matching the query): renewable energy power, renewable energy resources, photovoltaic generation, distributed power generation, distributed generation.


Liu Z.,North China Electrical Power University | Liu G.,North China Electrical Power University | Liu X.,Yulin Power Supply Corporation
Dianwang Jishu/Power System Technology | Year: 2013

In allusion to economic operation of distributed generation (DG) system considering demand response, a comprehensive optimal mathematical model, in which the fuel cost and the cost of operation and management, the interaction cost, the compensation cost for the outage of interruptible loads and electricity cost of demand side are taken into account, is established. Meanwhile, to implement effective interaction of energy a demand side response model is added to the established optimal model. A kind of quantum differential evolution (QDE) algorithm is proposed to solve the established optimal model. Based on the idea of differential evolution and using parallel and collapse properties of the quantum calculation theory and considering probabilistic nature of quantum bit in the selection strategy, the proposed algorithm possesses strong robustness and global searching ability. Calculation results of a microgrid containing different kinds of DGs show that the established coordinated optimal dispatching model and the proposed algorithm are reasonable and effective.

Document Keywords (matching the query): energy interactive, distributed power generation, distribution generation.


Zhang O.,North China Electrical Power University | Yu S.,North China Electrical Power University | Liu P.,North China Electrical Power University
Renewable and Sustainable Energy Reviews | Year: 2015

Distributed generation (DG) units can provide approaches and methodologies for the utilization and development of renewable energy. Meanwhile, electricity pool (EP), as a mode which can adapt to China's energy and power market, can effectively promote the market competition. After analyzing China's energy and power market, this paper, combining characteristics of distributed generation units with electricity pool, proposes Base-Market-Assist (BMA) in the pool mode. BMA mode not only makes a rational division according to China energy resources' endowment, but also utilizes agent operators to conduct operation management of distributed generation units, providing new methods for China renewable energy development in aspects of technology, market and policy. © 2015 Elsevier Ltd. All rights reserved.

Document Keywords (matching the query): renewable energy power, distributed generation units, energy resources, renewable energy development, renewable energy, electric power generation, distributed power generation, renewable energy resources, renewable energies.


Huang X.-C.,North China Electrical Power University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

The large scale penetration of Distributed Generation (DG) within distribution networks will significantly impact on the operation of future distribution systems. It will also be possible to take advantage of DG with regard to the service restoration in distribution networks. For example, when there is not enough capacity to restore the entire out-of-service area, the network operator can implement intentional island operation with the support of black-start DG to keep the electricity supply of important users. Furthermore, from the viewpoint of making full use of renewable energy sources, the network operator is required to ensure the interconnection of the renewable units that are installed in the out-of-service area. Based on these assumptions, this paper establishes a new optimization model for the solution of the service restoration problem of power grid with DG and applies NSGA-II to solve the model. Numerical analysis verifies the feasibility and correctness of the model.

Document Keywords (matching the query): distributed generations, renewable energy source, distributed power generation, distributed generation, energy policy.


Wei M.Y.,North China Electrical Power University
Applied Mechanics and Materials | Year: 2014

For the study of distributed generation and its impact on power system, this paper briefly introduces the basic concept, the advantages of distributed generation, and the concept and basic structure of micro-grid. From the power system planning, system voltage, power quality, island effect, relay protection and other aspects, this paper analysis and discusses the influence of distributed power on power system. To properly resolve the grid-connected distributed generation power influence, it will be helpful for the development of future of distributed power generation. Distributed power generation can be used not only as an important supplement of the traditional centralized power supply mode, but also as a very important role in energy utilization, it will become an important area of research and development in future energy. © (2014) Trans Tech Publications, Switzerland.

Document Keywords (matching the query): distributed power, energy utilization, future energies, distributed power generation, distributed generation dg.


Jiancheng Z.,North China Electrical Power University | Liantao J.,North China Electrical Power University
Proceedings of the 2010 5th IEEE Conference on Industrial Electronics and Applications, ICIEA 2010 | Year: 2010

All stand-alone distributed generation systems require an energy buffer to bridge the mismatch between available and required energy. The lead acid battery, which has a high energy density, is the most popular form of energy storage utilized. Nevertheless, it is impossible to supply the load with an instantaneous large power, due to its low power density. Accordingly, in this paper, a new hybrid energy storage system which is composed of battery and electrical double layer capacitor (EDLC) connected in parallel is established, it could make the best use of the characteristics of high energy density of battery and high power density, long circle life of EDLC. A buck and a bi-directional converter are also proposed to charge the battery and the EDLC with an additional function to stabilize the DC bus voltage. In comparison with the battery alone energy storage system, the proposed scheme can significantly improve the performance of the distributed generation system, enhance the energy using efficiency and reduce the battery capacity. Furthermore, the life of the battery can be lengthened for the reduced charging/recharging frequency of the battery when the generated power and the load power vary quickly. The high stability and high efficiency of the proposed system is verified through simulation and experiment results under various conditions. © 2010 IEEE.

Document Keywords (matching the query): high energy densities, distributed generation system, energy storage systems, high energy physics, distributed genertion system, hybrid energy storage, energy storage.

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