T–S fuzzy H-infinity control for three-phase-three-wire active power filter in power voltage distortion condition

The active power filter(APF) is an effective tool for harmonics abatement and power quality improvement,but the distortion of the power voltage deteriorates the accuracy in current detection and reduces the efficiency of compensation.To tackle this problem,we employ Takagi-Sugeno(T–S) fuzzy control method to build the model of the three-phase-three-wire APF in which the power voltage distortion is considered the disturbance to the idea model,and realize the T–S fuzzy H-infinity control with a given performance index.Satisfying the required stability,the designed T–S fuzzy H-infinity feedback controller makes the APF restoring the distorted power voltage to a voltage with sinusoidal characteristics,meeting the requirements of comprehensive compensation.Computer simulations show the validity of the T–S fuzzy control model and the efficacy of the H-infinity feedback controller.The reference compensation current can be detected accurately,and the controller is able to carry out the operation under the circumstance of non-sinusoidal power voltage.