ADVANCED CONTROL OF ACTIVE RECTIFIER USING SWITCH FUNCTION AND FUZZY LOGIC FOR NONLINEAR BEHAVIOUR COMPENSATION

Power Semiconductor switches of active rectifier ar e characterized by highly nonlinear property, resul ting in high harmonic distortion and high ripple voltag e on the DC side. This paper presents advanced control using switch function and fuzzy logic for compensat ing nonlinear behaviour. The system applies switch function of time as the input of control strategy, instead of current and voltage in d-q frame. The fu zzy logic controller aims to minimize DC voltage deviat ion by regulating the line current amplitude. This system uses minimum number of sensors, which is the voltage only to avoid the effect of sensor nonlinearity to the system. This performance is dem onstrated and compared with PI-optimized controller . Simulations result have been conducted for variatio n values of capacitance, inductance and loads. The results show that the harmonic distortion and the r ipple voltage on the DC side are 0.036 % compared PIoptimized controller as 5.64 %.

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