Abstract：Recently, the long-standing sub-synchronous oscillation (SSO) in wind farms has greatly affected the operation of power systems. Large-scale wind farms comprise various types of wind turbine generators (WTGs) and dynamic reactive power compensation devices, further increasing the complication. Based on the practical phenomenon for further study, this paper focuses on the interactions among the direct-drive permanent synchronous generator (D-PMSG)-based wind farm, static var compensator (SVC), and connected grid. First, the impedance-frequency characteristics of SVC are studied based on the time-domain model of SVC and the frequency scanning method. Moreover, a state-space model of the D-PMSG-based wind farm equipped with an SVC is established to calculate the modes and their participation factors. The sub-synchronous interaction between the SVC and the D-PMSG-based wind farm will then be observed. Results indicate that the SVC may weaken the damping of the wind farm integrated power system and increase the risk of SSO. Furthermore, there is an obvious interaction between the SVC and the D-PMSG-based wind farm, which will lead to oscillation. System strength and control parameters of the SVC and D-PMSG-based wind farms can influence the oscillation characteristics. Theoretical results are verified by simulation.
黄碧月, 陈雅皓, 孙海顺, 毛俞杰, 韩应生, 王东泽. 考虑静止无功补偿器的直驱风电并网系统次同步振荡[J]. 清华大学学报（自然科学版）, 2021, 61(5): 446-456.
HUANG Biyue, CHEN Yahao, SUN Haishun, MAO Yujie, HAN Yingsheng, WANG Dongze. Sub-synchronous oscillation in wind farm integrated power system considering static var compensator. Journal of Tsinghua University(Science and Technology), 2021, 61(5): 446-456.
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