Minimum time current control of three-phase PWM rectifier with LCL filter interface

This paper proposes a minimum time current optimal controller for three-phase pulse width modulation (PWM) rectifier with LCL filter. The proposed scheme is realized by choosing the optimal control voltage for the current reference tracking with minimum time under the maximum voltage and maximum current limit constraint. The solutions of this optimization model are obtained by solving the Hamiltonian function. Simulation and experimental results demonstrate that the proposed optimal controller could achieve smaller transient current response time than the conventional synchronous proportional-integral (PI) controller, and performance of dc-link voltage is greatly improved, which, at the same time, could suppress DC-bus voltage variations by way of reactive current control.