非平衡条件下三相逆变电源相位对称性的研究

Study on Phase Symmetry of Three-phase Inverter in Unbalanced Load

针对常规三相逆变电源不能满足任意不平衡负载的缺点,提出了一种组合式三相逆变电源, 其电路和磁路完全解耦。各相电压独立调节,相位分别采用锁相环进行闭环控制,使输出电压的相位跟踪各自的基准相位,保证了输出电压和相位的对称性。实验证明了电路设计的正确性,该方案已应用到SFC-D系列逆变电源中。

According to the disadvantage of conventional three-phase inverter unsuited for any unbalanced load, a combinatorial three-phase inverter is presented. Its electrocircuit and magnetic circuit are completely decoupling. Every phase voltage is adjusted independently and every phase uses independently close-loop-control in the form of phase-locked-loop, which make output voltage phase follow the phase of reference, ensuring the symmetry of output voltage and phase. The experiment shows that the proposed design is right. This scheme has been applied in SFC-D family inverters.