【摘要】 提出了一种基于三相四开关结构容错型有源电力滤波器,并提出其控制方法。首先给出了容错型有源电力滤波器的结构和运行模式。逆变器某相故障时,逆变器的容错结构为三相四开关型逆变器,即以两个电容组成的桥臂代替故障相,并分析了其工作原理。提出了稳定直流侧总电压和两个电容电压平衡的方法。仿真结果表明,三相四开关结构容错型有源电力滤波器在正常工作状态和故障状态都能较好地抑制谐波,直流侧电压保持稳定,系统可靠性高。更多还原

【Abstract】 A fault-tolerant active power filter(APF) based on three-phase four-switch with its controlling method were proposed.The structure and running models of APF were given firstly.When the inverter of APF had fault in one phase,its fault structure was the three-phase and four-switch,which used a bridge composed of two capacitors to replace the fault phase.The corresponding working principle was analyzed.The method to stabilize the DC-link voltage and capacitor voltages was proposed.Simulating results showed that harmonic currents were suppressed by the fault-tolerant paralleling APF whether working on the normal state or fault state.The DC-link voltage stayed stable and the system had high reliability.更多还原