基于状态矩阵和摄动理论的双馈风力发电机与同步机小扰动互作用机理

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Abstract With the increasing applications of doubly-fed induction generators (DFIGs), the study on the mechanism of small signal dynamic interaction between DFIGs and synchronous generators becomes increasingly important. In order to reveal the interaction mechanism, in this paper, the relationship between the terminal voltage phase and rotor side vector control of DFIG is analyzed firstly. And then, the relation expression considering the variation of terminal voltage phase and the angular frequency deviation between the phase locked loop (PLL) of the DFIG and the power grid is established. On this basis, the state matrix that reflects the coupling property between the PLL of DFIG and the power angle of synchronous generator is established based on the system containing a single synchronous generator, an infinite bus, and a single DFIG. Furthermore, the coupling interaction between the modes of the state matrix is studied using the perturbation theories and the modal analysis method. Then the interaction mechanism between the oscillatory modes of the synchronous generator and the PLL is revealed. In the end, the correctness of the analysis is verified by the comparison of the oscillatory modes and their dominant state variables and participation factors.

Key words： Doubly-fed induction generator (DFIG) small-signal dynamic interaction state matrix perturbation theories phase-locked loop

Received: 01 July 2015 Published: 20 April 2016

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TM712

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	Bi Tianshu
	Wang Qing
	Xue Ancheng
	Xia Deming

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Bi Tianshu,Wang Qing,Xue Ancheng等. The Mechanism of Small Signal Dynamic Interaction Between DFIG and Synchronous Generator Based on State Matrix and Perturbation Theories[J]. Transactions of China Electrotechnical Society, 2016, 31(7): 126-135.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I7/126

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