Optimized design of modified proportional-resonant controller for current control of active filters

With the recent advances in power electronic technology, the increase of non-linear loads such as power converters has deteriorated power quality and sparked the research in power quality issue. Shunt Active filter(SAF) is a power electronic device developed to improve power quality. Proportional-resonant(PR) type controller appears to be appropriate for the control system in active filters, where the precise tracking performance of harmonic currents is required. However, due to the complexity of the controller structure, to obtain suitable controller parameters, it requires considerable design effort in particular for a non-expert. This paper presents an automated design procedure to optimize a modified proportional-multiple resonant controller for the compensation of all main order harmonics, the 5^th, 7^th, 11^th, 13^th, 17^th and 19^th harmonics. The principle of the proposed control method and the optimization procedure based on genetic algorithms are described in detail. The excellent control performance has been carried out by simulations.