Study on Three-phase PWM Rectifier Controller Based on H_∞ Control Algorithm

An H∞ control method for the inner current loop of three-phase PWM rectifier was presented.Based on the mathematic model of three-phase PWM rectifier in d-q reference,the problem of the current loop controller is turned into standard setup H∞control problem.State equations of the current loop are established with suitable state variables.In order to derive the designed controller,the definite solution of Riccati inequation is solved.The system can still work well under the condition of model perturbance and external disturbance.Simulation and experiment results demonstrate that the designed controller system is suitable and effort for the PWM rectifier.