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提出一种应用静止同步补偿器(static synchronous compensator,STATCOM)抑制次同步谐振(subsynchronous resonance,SSR)的模态互补电流控制方法。该方法采用发电机转速偏差信号作为反馈,动态生成与各模态频率互补的补偿电流信号。STATCOM实时跟踪该电流信号,向机组定子注入幅值和相位均可控的次同步和超同步补偿电流,进而在机组内部激发出与扭振模态频率一致的电磁转矩,从而对SSR起到抑制作用。从理论上推导出补偿电流与电气阻尼系数之间的定量关系,并设计控制器参数的优化方法。以某典型厂对网串联补偿输电系统为实例,通过电磁仿真验证上述机制及控制策略的有效性。通过与同背景下采用静止无功补偿器(static var compensator,SVC)抑制SSR方案的比较分析,表明基于上述方法的STATCOM抑制SSR的方案具有一定的技术/经济优越性。
This paper proposes a modal complementary current control method to suppress subsynchronous resonance (SSR) using static synchronous compensator (STATCOM). The method uses generator speed deviation signal as feedback to dynamically generate a compensation current signal complementary to each modal frequency. STATCOM real-time tracking of the current signal to the unit stator injection amplitude and phase controllable subsynchronous and super-synchronous compensation current, and then in the unit excited with the torsional vibration mode frequency electromagnetic torque consistent with the SSR played Inhibition. The quantitative relationship between compensation current and electrical damping coefficient is deduced theoretically and the optimization method of controller parameters is designed. Taking a typical plant network compensation transmission system as an example, the effectiveness of the above mechanism and control strategy is verified by electromagnetic simulation. The comparative analysis of inhibition of SSR with static var compensator (SVC) in the same background shows that the scheme of STATCOM inhibiting SSR based on the above method has some technical and economical advantages.