Research on the topological structure of unified power quality conditioner for threephase four-line system

This paper introduces basis structure of unified power quality conditioner. According to the different compensation methods of series and parallel connection, introduces several topology structures. Through the comparison among several topological structure performances, selects a suitable proposal for three-phase four-line control system, and carries the experiments of the typical harmonic source in power grids and the simulation analysis of Three-phase rectifier bridge, gives the experimental waveform. The results prove that the selected topological structure is flexible and effective.