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针对实际应用中独立可靠稳定运行的静止同步补偿器(STATCOM)在规模化并联补偿时会出现谐振现象,建立了单个STATCOM的诺顿等效电路以及电网侧的戴维南等效电路,得出了较高的网侧阻抗是导致系统谐振的主要原因的结论;建立了多个STATCOM并联时的数学模型,推导了系统的闭环传递函数;利用所建立的数学模型分析了STATCOM数量、负载变化以及有源阻尼反馈系数对系统闭环频率特性的影响。最后,通过仿真证明了所提数学模型的有效性。
In order to solve the problem that the STATCOM with independent and stable operation can resonate in large-scale parallel compensation, the Norton equivalent circuit of single STATCOM and the Thevenin equivalent circuit in the grid side are established, and the higher The impedance of the grid side is the main reason of the system resonance. The mathematical model of multiple STATCOMs in parallel is established, and the closed-loop transfer function of the system is deduced. The mathematical model of the STATCOM is used to analyze the quantity of STATCOM, load variation and active damping Effect of Feedback Coefficient on Closed-loop Frequency Characteristics of System. Finally, the simulation results show the validity of the proposed mathematical model.