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结合南方电网±200 Mvar链式静止同步补偿器(STATCOM)的应用实践,研究了大容量STATCOM对电网电压的控制策略。基于STATCOM装置的动态无功补偿原理,介绍了STATCOM装置4种控制模式,指出正式运行时仅采用稳态调压和暂态电压控制2种模式,根据目标母线电压自动进行模式识别和切换。介绍了稳态调压控制基本参数的设计,分析了该模式下STATCOM对电网电压的调节范围和效果。通过对电网故障的针对性分析,设计了STATCOM暂态电压控制逻辑,指出近端故障时可进入零无功的主动闭锁状态。对比全日电网电压曲线和STATCOM无功曲线,印证了STATCOM稳态调压模式可跟踪电网电压进行实时调节。分析故障录波数据,验证了STATCOM在电网故障时可在20 ms左右达到90%的最大暂态输出的设计要求。实践证实了所述的STATCOM的电网电压控制策略的可行性和有效性。
Combined with the application of ± 200 Mvar STATCOM in China Southern Power Grid, the control strategy of large capacity STATCOM for grid voltage is studied. Based on the principle of dynamic reactive power compensation of STATCOM, four kinds of control modes of STATCOM are introduced. It is pointed out that only two modes of steady state voltage regulation and transient voltage control are adopted during the formal operation, and pattern recognition and switching are automatically performed according to the target bus voltage. The design of the basic parameters of steady-state voltage regulation control is introduced. The adjustment range and effect of STATCOM on the grid voltage in this mode are analyzed. Through the targeted analysis of the power grid fault, the STATCOM transient voltage control logic is designed, and the active-active state of zero reactive power input is pointed out when the near-end fault occurs. Compared with the full-day power grid voltage curve and STATCOM reactive power curve, it confirms that STATCOM steady-state voltage regulation mode can track the grid voltage for real-time adjustment. Analysis of fault recording data verifies that STATCOM achieves 90% of the maximum transient output design requirement in about 20 ms in case of grid fault. The feasibility and effectiveness of the proposed grid voltage control strategy for STATCOM has been demonstrated.