Frequency Stability Control Strategy for Large-scale Grid Connections with DFIG Units

doi:10.11930/j.issn.1004-9649.202003163

Abstract

Abstract: The penetration rate of wind power in the power grid has been increasing year by year. A lot of contributions have been made to optimize the power supply structure, energy conservation and emission reduction, however, due to the natural fluctuation and uncertainty of wind speed, grid integration with large-scale wind power is bound to impact the frequency stability of the power grid. With regard to this problem, the doubly-fed induction generator (DFIG) control system was studied in this paper and then the primary frequency modulation control strategy following large-scale DFIG connection was established. On the basis of the existing droop control and virtual inertia control strategy, the droop control part is implemented by virtue of variable coefficient according to the input wind speed and the frequency fluctuation of grid side, as to improve the droop control characteristics. Additionally, the operating conditions of DFIG are classified, and the load reduction coefficient is used to reduce the curtailment of wind while the DFIG is running at limited power level. The effectiveness of the proposed primary frequency modulation control strategy is verified by means of the simulation of an actual power grid model with large-scale wind power grid connection.

Key words: DFIG, frequency stability, variable coefficient droop control, virtual inertia control, variable coefficient offload control, large-scale wind power grid connection

YANG Lei, WANG Zhichao, ZHOU Xin, LI Shengnan, HE Peng, XIANG Chuan, ZHANG Jie, WANG Delin. Frequency Stability Control Strategy for Large-scale Grid Connections with DFIG Units[J]. Electric Power, 2021, 54(5): 186-194.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202003163

https://www.electricpower.com.cn/EN/Y2021/V54/I5/186

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