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在含有LCL滤波器的静止同步补偿器(STATCOM)中,传统以逆变器侧电流直接反馈控制的策略没有考虑滤波电容支路上电流的影响,造成STATCOM无功补偿能力下降。文中提出了由STATCOM逆变器侧电流估算其注入电网电流的方法,并将计算得到的STATCOM注入电网电流与指令电流进行比较控制,以减小电容支路电流的影响,从而提高了STATCOM的无功补偿能力,分析了该控制方法的稳定性,并进行了仿真研究。仿真结果验证了所提方法的正确性与优越性。
In the static synchronous compensator (STATCOM) with LCL filter, the traditional strategy of direct feedback control of inverter side current does not consider the influence of the current on the filter capacitor branch, resulting in the decrease of STATCOM reactive power compensation capability. In this paper, a method of estimating the injected grid current from the STATCOM inverter side current is proposed, and the calculated STATCOM injected grid current is compared with the commanded current to reduce the influence of the capacitor branch current, thereby increasing the STATCOM’s Power compensation ability, the stability of the control method is analyzed, and the simulation research is carried out. The simulation results verify the correctness and superiority of the proposed method.