Optimization of energy-feedback AC electronic load system performance based on improved MPC algorithm and DC bus harmonic suppression
A direct current(DC)energy-feedback alternating current(AC)electronic load device consisting of a single-phase PWM rectifier and a soft-switching phase-shifting full-bridge converter cascade is studied for the problems of low accuracy,single load type and large energy loss of traditional factory power supply test.In view of the static error of the model predictive control(MPC)algorithm used in the front stage,a current compensation link based on the intima principle is designed to correct the given current value,so as to realize the current tracking without static error.The double closed-loop PI(proportional-integral)control strategy with trap filter for the external loop of bus voltage and the internal loop of grid-connected current is adopted in the back stage to suppress the influence of the second harmonics of the DC bus on the grid-connected current.The simulation model and experimental platform of DC energy-feedback AC electronic load are established,and the results show that the improved MPC algorithm can improve the static tracking performance of the input current of the front-stage unit,and the trap filter can effectively improve the quality of the grid-connected current of the back-stage unit.
AC electronic loadimproved model predictive controlstatic errorenergy recycling
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