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SUMMARY The home applications of distributed generations facilities such as photovoltaic and gas engine cogeneration systems are growing and many distributed generations are connected to a grid by a DC/AC inverter. The DC/AC inverter is controlled by a phase-locked loop (PLL) in order to be synchronized with the power system frequency. However, the control scheme of stand-alone operation uses voltage control, and the PLL is unnecessary. Therefore, it is hard to realize uninterrupted change between stand-alone and grid-connected operation. In this paper, we propose a virtual synchronous generator control scheme in order to use the same control scheme in stand-alone and grid-connected operation. We carried out experiments to demonstrate the control characteristics. [ABSTRACT FROM AUTHOR]

For the past few years, hybrid generation systems including solar panel and gas cogeneration have been used for residential houses. Solar panels can generate electronic power at daytime but not at night. But the power consumption of residential houses usually peaks in the evening. The gas engine cogeneration system can generate electronic power without such a restriction, and it also can generate heat power to warm up a house or to produce hot water. In this paper we propose a solar panel and gas engine cogeneration hybrid system with an energy storage device, combined by a DC bus. If a blackout occurs, the system still can supply electronic power for special house loads. We propose a control scheme for the system related to the charging level of the energy storage device and the voltage of the utility grid, which can be applied to both grid-connected and standalone operation. Finally, we report experiments designed to demonstrate system operation and calculations for loss estimation. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 182(4): 29-46, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com).DOI 10.1002/eej.22321 [ABSTRACT FROM AUTHOR]