Adaptive fuzzy based three-loop composite control of subway auxiliary inverter

Aiming at the problem of output waveform distortion and slow dynamic response, an adaptive-fuzzy based on three-loop compound control strategy is investigated for subway auxiliary inverter system with nonlinear loads and loads switch or busbar voltage fluctuation. In the process of control system design, the appropriate fuzzy sets are derived according to actual operation characteristics of the system at first. Then through Matlab/simulink platform, simulation experiments for the combined fuzzy control system are carried out, and the results prove the validity of the designed control algorithm. Finally, the advocated composite controller is applied to a 2.5KVA test prototype, and the experimental results show that the control strategy has significant inhibitory effect on both the nonlinear loads and busbar voltage fluctuation of the inverter system.