三相PWM整流器最优控制策略研究

PWM rectifier systems typically use two-loop control method. The inner current loop is a MIMO coupling system .The conventional control method is that the input currents are decoupling and a PI controller is used. This paper presents a linear quadratic regulator (LQR) for the inner current loop control without decoupling. Firstly, the state equations are built and the state variables are selected. Then, a Riccati equation is solved and a constant value adjoint matrix is calculated to derive the designed controller. Simulation and experiment results prove the correctness of the control strategy.