Dynamic Coordination Mechanism of DFIGs Based on Inertia Response

doi:10.11930/j.issn.1004-9649.202108078

Abstract

Abstract: Large-scale wind power integration occupies the capacity space of synchronous generators with moments of inertia and weakens the inertia level and frequency regulation ability of the power system. Therefore, the participation of wind power generation in system frequency regulation is urgently needed. On the basis of the frequency response model of the doubly-fed induction generator (DFIG), an inertia expression is obtained analytically, and the influence of phase-locked loop (PLL) control parameters on the inertia characteristics of DFIG is analyzed. It is then concluded that the inertia response of DFIG can be achieved by optimizing PLL control parameters when unbalanced power disturbance occurs in the system. With a parallel system of two DFIGs as an example, the law of unbalanced power distribution between the DFIGs during inertia response is analyzed and extended to multi-machine parallel systems. A frequency response model of a system of integrated DFIGs and synchronous generators is built, and the frequency response characteristics in each stage of power disturbance are analyzed. Finally, the effectiveness of the theoretical analysis is verified by time-domain simulation.

Key words: wind power generation, unbalanced power, frequency response, phase-locked loop, inertia characteristics

LIU Zhaorui, JIA Qi, YAN Gangui, ZHAI Wenchao, SUN Yong, LI Baoju. Dynamic Coordination Mechanism of DFIGs Based on Inertia Response[J]. Electric Power, 2022, 55(7): 142-151.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202108078

https://www.electricpower.com.cn/EN/Y2022/V55/I7/142

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