基于分散式微电网的虚拟同步发电机无通信预同步并网方案

doi:10.19595/j.cnki.1000-6753.tces.L80765

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Abstract The new decentralized micro-grid structure has become the focus of research in recent years because of no communication between equipments, low cost and good stability, but its multi machine pre-synchronous grid connection has become a technical difficulty. In view of the decentralized structure, a non-communication pre-synchronous control scheme is proposed by using single VSG, and the current limitation is adopted to solve the circulation. Firstly, there are introductions to the principle of pre-synchronization based on virtual power and three pre-synchronization methods of multi-parallel VSGs. Secondly, the performance of two phase pre-synchronization controllers is analyzed by the small signal model; the theoretical analysis on the active power circulation problem is carried out by equivalent frequency model for parallel VSGs in the pre-synchronization process; the parameters of first-order virtual inertia link are designed by equivalent VSG. Finally, the simulation and experiment results of three pre-synchronization methods show that the proposed pre-synchronization method can not only reduce the dynamic power circulation of parallel VSGs but also actualize the fast-pre-synchronization control, and then the seamless switching control of DGs can be realized.

Key words： VSG pre-synchronization virtual power decentralized power circulation

Received: 11 July 2018 Published: 12 October 2019

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TM74

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	Yan Xiangwu
	Wang Desheng
	Jia Jiaoxin

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Yan Xiangwu,Wang Desheng,Jia Jiaoxin. Non-Communication Pre-Synchronization Scheme of VSGs Based on Decentralized Microgrids[J]. Transactions of China Electrotechnical Society, 2019, 34(19): 4143-4153.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80765 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I19/4143

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