Additional Damping Cooperative Control Method of Virtual Synchronous Wind Farm and Photovoltaic Power Stations

doi:10.11930/j.issn.1004-9649.202011043

Abstract

Abstract: The rapidly growing grid-connected capacity of new energy units may cause low-frequency oscillations in the power system, and thus new energy units based on wind power and photovoltaic (PV) should have the ability to restrain low-frequency oscillations. This paper takes the system including wind farm and PV power stations as the research object and clarifies the principle of virtual synchronous generator (VSG) control and additional damping control for doubly-fed induction generator (DFIG) to increase system damping. With the change of active power at the grid-connection point of DFIG as input, additional damping controllers are designed on the active power control loop of the VSG wind farm and the controller of PV power stations respectively. Then, the cooperative control strategies are designed according to the operating areas of DFIG. When DFIG is operating in the constant speed zone, considering the slow response speed of the pitch control and the unsatisfactory effect of suppressing oscillations, DFIG no longer participates in the additional damping control, and the PV power station outputs additional power to compensate the shortcomings of DFIG. Finally, a simulation system including wind farm and PV power stations is established, and the effectiveness and correctness of the cooperative control method are verified through Prony analysis and time-domain simulation verification.

Key words: virtual synchronous wind farm, PV power stations, additional damping control, low-frequency oscillation

SHENG Shixian, ZHOU Xin, WANG Delin, LIAO Jiasi, LI Jingqi, KANG Jitao. Additional Damping Cooperative Control Method of Virtual Synchronous Wind Farm and Photovoltaic Power Stations[J]. Electric Power, 2022, 55(3): 177-186.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202011043

https://www.electricpower.com.cn/EN/Y2022/V55/I3/177

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