研究了三相四线统一电能质量调节器(UPQC)系统的串联变流器控制策略,该策略将串联变流器控制为正弦电流源,通过在静止ABC坐标系下对串联变流器三相输入电流分别进行独立控制,实现了电网输入电压非正弦、不平衡条件下的三相输入电流的基本平衡与正弦,且直流母线2组电容电压稳定平衡。实验结果表明该控制策略是有效的,为三相四线UPQC系统对电网侧电能质量的改善及其并联变流器的正常运行提供了可靠的保障。 The control strategy of series converter in three-phase four-wire unified power quality regulator (UPQC) system is studied. The strategy of the series converter is controlled as the sinusoidal current source. By using the static ABC coordinate system, The input current is independently controlled. The basic balance and sinusoidal three-phase input current under non-sinusoidal and unbalanced input voltage of the power grid are realized, and the capacitance voltage of the two DC buses is balanced and balanced. The experimental results show that this control strategy is effective and provides a reliable guarantee for the power quality improvement and the parallel operation of the parallel converter in three-phase four-wire UPQC system.