The design and analysis of the pi regulator of three-phase voltage source PWM rectifier

In order to quicken the dynamic response and strengthen the ability against the disturbance of nonlinear load, three-phase voltage source PWM rectifier widely employs dual loop PI control scheme which consists of inner current controller and external voltage controller. The parameters of dual loop PI regulators have significant influence on the dc-link voltage, AC harmonic components and power factor of three-phase voltage source PWM rectifier. The design of dual loop PI regulator parameters is a very important, complicated and empirical work. With the simulation tool of Matlab/Simulink, this paper analyzes the influence of different dual loop PI regulator parameters on the operating characteristics of three-phase voltage source PWM rectifier. Based on that, a adjustment approach of dual loop PI regulator parameters which is simple and convenient is proposed. The simulation results show the effectiveness and feasibility of the proposed approach.