关键词: 有源电力滤波器, T-S模糊控制, 电容分裂中点, 均压控制, 参考补偿电流

Abstract: Capacitor splitted midpoint three-phase-four-wire Active Power Filter（APF） is an effective tool for harmonics abatement and three-phase-four-wire power quality improvement, but the difficulty of individual voltage control to the splitted capacitor impresses that it reduces the efficiency of compensation. To tackle this problem, by analysis of the main circuit, it employs Takagi-Sugeno（T-S） fuzzy control method to build the model of voltage equilibrium of the three-phase-four-wire APF in which the two voltages in DC side considered as input variables, and the source currents are feedback controlled. Satisfying the T-S fuzzy control model, the designed T-S fuzzy controller makes a balanced midpoint voltage, meeting the requirement of harmonics compensation. Computer simulations and examination results show the validity of the T-S fuzzy controller and the efficacy of equilibration of the midpoint voltage. The controller is able to carry out the operation in good steady-state accuracy and high quality dynamic characteristics.

Key words: active power filter, T-S fuzzy control, capacitor splitted midpoint, voltage equilibrium control, reference compensation currents