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Brandao M.,Swan Energy | Johal H.,General Electric | Ion L.,General Electric
2011 IEEE PES Innovative Smart Grid Technologies, ISGT Asia 2011 Conference: Smarter Grid for Sustainable and Affordable Energy Future | Year: 2011

Energy Storage has always been an attractive proposition for utilities. In fact, having more flexibility in managing demand and supply of electricity can help to improve the operational stability and efficiency of the power system which is an objective of both electricity industry and governments. Energy Storage has the capability of being the mediator between demand and supply and its adoption would increase the flexibility of the electricity supply system. In particular, on the Low Voltage side, DNSPs could benefit from having distributed storage in particular points on the grid. Storage could take the form of new systems or use spent EV batteries with enough capability for grid-connected stationary applications. There are a range of different benefits that can be harvested by different actors in the electricity value chain, which makes the task of identifying the value proposition for Energy Storage in LV systems a rather complex one. The Energy Storage device can be owned and/or operated by one of the identified actors. Whichever ownership and control method is chosen, there are important challenges in the creation of market rules for appropriate valuation of the benefits from distributed storage. Suggestions for more research are given. © 2011 IEEE. Source


Wojszczyk B.,General Electric | Brandao M.,Swan Energy
2011 IEEE PES Innovative Smart Grid Technologies, ISGT Asia 2011 Conference: Smarter Grid for Sustainable and Affordable Energy Future | Year: 2011

High penetration of DG can present significant challenges to utility design/engineering practices as well as to the reliable operation of the electric grid. This paper examines the impact of large-scale DG implementation on electric grid operational performance. © 2011 IEEE. Source


Brandao M.,Swan Energy | Panosyan A.,General Electric | Walling R.,General Electric
2011 IEEE PES Innovative Smart Grid Technologies, ISGT Asia 2011 Conference: Smarter Grid for Sustainable and Affordable Energy Future | Year: 2011

Residential Solar PV is being deployed in Australia at increasing rates. The distribution grid wasn't designed to accommodate local generation so impacts are expected to happen and challenge the way the LV network is being run today. From the various identified effects, this paper explores Voltage control aspects in particular. A set of 5 different options to deploy and use customer-owned inverters for reactive power compensation are presented, ranging from pure stand-alone inverter control and management to DNSP centralized control scheme. All options come with challenges which are also highlighted in this paper. There are also additional opportunities that could be brought by some of the propositions discussed and contribute to a more efficient and resilient grid. The paper concludes with a brief layout of what regulatory, tariff and standard implications would be implicit by the options forwarded. © 2011 IEEE. Source


Jitaru I.D.,Swan Energy
INTELEC, International Telecommunications Energy Conference (Proceedings) | Year: 2014

The paper will present two novel Soft Switching Half Bridge Topologies used in a 1KW DC-DC Converter, operating after a PFC and providing an isolated 12V at 83A. The two topologies are derived from a conventional Half Bridge topology and through different means are converted to "true" soft switching topology. A "true" soft switching topology combines zero current at turn off in the secondary through the synchronous rectifiers and zero voltage switching across the primary switchers. This is accomplished in the first topology without any additional hardware, just through sizing and intelligent control. In the second topology, we add two small current "injectors" aimed in shaping the current through the rectifier means and primary switchers just during the transitions. In combination to a novel magnetic structure and intelligent control, this converter efficiency crosses the 99% efficiency barrier. © 2014 IEEE. Source


Jitaru I.,Swan Energy
PCIM Europe Conference Proceedings | Year: 2014

The paper will present a novel Soft Switching Flyback Topology which utilizes the energy contained in the parasitic resonant circuit formed by the capacitance across the primary power switch and magnetizing inductance to create soft commutation for the primary power switch. The energy contained in the parasitic resonant circuit creates ringing across the primary power switch during the dead time. This energy is typically dissipated or dampened during the dead time period. The ringing across the primary switch during the dead time period can disturb the control IC that drives the synchronous rectifier in the secondary leading to accidental turn on which impact the efficiency and the reliability of the converter. The proposed technology eliminates this ringing by "freezing" the energy contained in the parasitic resonant circuit and by using that energy to create soft switching condition for the primary switch. © VDE VERLAG GMBH. Source

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