The engineering design and optimisation of inverter output RILC filter in AC motor drive system

This paper presents an engineering method in VVVF (variable voltage variable frequency) output filter design. This methodology is based on the harmonic characteristics of some commonly used modulation techniques, filter equivalent circuit in high frequency and low frequency. The influence of the filter on motor is taken into consideration. The effect of switching time lag and overmodulation on filter design is discussed. Filter parameters obtained from this design procedure are optimized using fuzzy optimization in consideration of cost factor and elastic constraints. This design method is applied to a VVVF-motor system as an instance. Simulation and experimental results validate the practicability of the proposed method.