Comparison of the back-stepping and PID control of the three-phase inverter with fully consideration of implementation cost and performance

The three-phase inverter with LC filter has been widely applied in many industrial areas, mainly for non-connected grid utilization. Meanwhile, the standard of power quality needed in industrial applications tends to grow as time goes by, requiring more advanced and economical control strategies to fulfil this objective without comprising the stability of the system. For this reason, a comparative study of Back-stepping control strategy and PID control method are presented in this paper, based on an unconnected-to-grid three-phase inverter with LC filter. The control purpose is to produce sinusoidal load currents with amplitude and frequency fixed by a reference signal, where both steady state performance as well as transient performance are examined and compared, with fully consideration of implementation cost. Two controllers have been built in a Matlab/Simulink environment, where Park transformation (abc/dq0) and bipolar Sinusoidal Pulse Width Modulation (SPWM) strategy are implemented. For validation, hardware verification is also presented based on dSPACE DS1103 control-based prototype.