H∞ control of line-side converter in electric multiple unit

This paper presents a robust H
_∞
control method for the PWM rectifiers to improve the control performance. First, a state space model of line-side pulse rectifier in Electric Multiple Unit (EMU) is constructed. The outer voltage loop controllers based on d-q frame are designed respectively, and the state equations are built and the weighting functions are selected. Then, the controllers are derived by solving the Riccati inequalities. Simulation results demonstrate that the designed H
_∞
, controller is suitable for the PWM rectifiers and has better external disturbance rejection capability compared with the conventional PI-based instantaneous current control (ICC) scheme.