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Virtual Synchronous Generator Based Current Synchronous Detection Scheme for a Virtual Inertia Emulation in SmartGrids

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Energy and Power Engineering 2019年第3期11卷 99-131页

作者： Arvind Parwal martin fregelius Dalmo Cardosa Silva Tatiana Potapenko Johannes Hjalmarsson James Kelly Irina Temiz Janaina Goncalves de Oliveira Cecilia Bostrom Mats Leijon Division of Electricity Department of Engineering SciencesUppsala UniversityUppsalaSweden Department of Electrical Engineering Universidade Federal de Juiz de ForaJuiz de ForaBrazil MaREI—Centre for Marine and Renewable Energy Ireland University College CorkCorkIreland Department of Electrical Engineering Chalmers University of TechnologyGothenburgSweden

Renewable energy sources, such as photovoltaic wind turbines, and wave power converters, use power converters to connect to the grid which causes a loss in rotational inertia. The attempt to meet the increasing energy demand means that the interest for the integration of renewable energy sources in the existing power system is growing, but such integration poses challenges to the operating stability. Power converters play a major role in the evolution of power system towards SmartGrids, by regulating as virtual synchronous generators. The concept of virtual synchronous generators requires an energy storage system with power converters to emulate virtual inertia similar to the dynamics of traditional synchronous generators. In this paper, a dynamic droop control for the estimation of fundamental reference sources is implemented in the control loop of the converter, including active and reactive power components acting as a mechanical input to the virtual synchronous generator and the virtual excitation controller. An inertia coefficient and a droop coefficient are implemented in the control loop. The proposed controller uses a current synchronous detection scheme to emulate a virtual inertia from the virtual synchronous generators. In this study, a wave energy converter as the power source is used and a power management of virtual synchronous generators to control the frequency deviation and the terminal voltage is implemented. The dynamic control scheme based on a current synchronous detection scheme is presented in detail with a power management control. Finally, we carried out numerical simulations and verified the scheme through the experimental results in a microgrid structure.

关键词： Current Synchronous Detection Dynamic Droop Control Energy Storage Virtual Inertia Virtual Synchronous Generator

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