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从能量保持恒定的角度采用直流侧电压控制方法对三相动态无功补偿器进行设计,在三相负荷不对称的情况下,提取三相不对称负荷的基波负序分量,对动态无功补偿器的算法进行了负序分量补偿。同时,通过对稳定谐波源进行谐波分析,提取其特征谐波进行补偿,可以起到补偿无功和谐波的作用。仿真结果表明在不对称谐波源情况下,叠加负序分量补偿后的三相系统电流完全对称,并可滤除负荷特征谐波含量。采用上述算法的动态无功补偿器可以通过对负荷的分析,根据负荷及实际的装置进行控制策略调整,具有较大的工程实际意义。
The DC voltage control method is adopted to design the three-phase dynamic VAR compensator from the perspective of maintaining constant energy. When the three-phase load is asymmetric, the negative sequence components of the three-phase asymmetric load are extracted, and the dynamic reactive power Compensator algorithm for negative sequence component compensation. At the same time, by harmonic analysis of the stable harmonic source, extracting its characteristic harmonic for compensation, it can play the role of compensating reactive and harmonics. The simulation results show that in the case of asymmetric harmonic sources, the three-phase system current compensated by the superimposed negative sequence components is completely symmetrical and the harmonic content of the load characteristic can be filtered out. The dynamic reactive power compensator using the above algorithm can analyze the load, adjust the control strategy according to the load and the actual device, and has great practical significance.