Abstract：This paper mainly investigates sub-synchronous control interaction (SSCI) caused by open-loop modal resonance between static synchronous compensator (STATCOM) and multiple permanent magnet synchronous generators (multi-PMSGs). The open-loop linearized analysis model of the STATCOM is derived, and the closed-loop interconnected dynamic model of the multi-PMSGs power system with a STATCOM is worked out. When the parameters of controllers of STATCOM are not properly turned, open-loop modal resonance may occur between STATCOM and PMSG, triggering the sub-synchronous control interaction. A new estimate index based on the residual theory is proposed to effectively evaluate the SSCI between STATCOM and PMSG caused by open-loop modal resonance. Case study shows that the reactive current control interaction between STATCOM and PMSG is much heavier than DC control interaction in the event of open-loop modal resonance, which may cause severe sub-synchronous oscillation instability. Nonlinear simulation verifies the correctness of the theoretical analysis. It is shown that the output power of PMSG is proportional to the SSCI caused by modal resonance, while the electrical equipment space and power grid strength are inversely proportional to the SSCI. In addition, constant voltage control is more threatening to system stability than constant reactive power control for the STATCOM.
任必兴, 杜文娟, 王海风. 静止同步补偿器与直驱永磁风机的次同步控制交互研究[J]. 电工技术学报, 2018, 33(24): 5884-5896.
Ren Bixing, Du Wenjuan, Wang Haifeng. Analysis on Sub-Synchronous Control Interaction between Static Synchronous Compensator and Permanent Magnet Synchronous Generator. Transactions of China Electrotechnical Society, 2018, 33(24): 5884-5896.
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