Fault-tolerant Active Power Filter Based on 3-phase 4-switch Structure
Peng Jin-jie · Proceedings of the Chinese Society of Universities for Electric Power System and its Automation · 2013
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.