Abstract
PWM rectifiers which can realize unity power factor and sinusoidal input current have been widely investigated to overcome problems of reactive power and harmonic current in electric power systems. However, in such PWM rectifiers, an LC filter which is necessary for absorption of carrier harmonics and for reduction of commutation spike voltage may cause waveform distortion and transient oscillation of the ac input current. As a solution to these problems, a new control method introducing state feedback control of the LC filter was proposed in our previous paper. To achieve stable operation in this method, the control frequency or carrier frequency of the PWM rectifier must be higher than 5 times the resonant frequency of the LC filter. So, a method to reduce the required carrier frequency is necessary to implement high power PWM rectifiers.In this paper, a parallel connection of two bridge circuits is introduced to reduce the required carrier frequency. A new control method for the parallel connected PWM rectifiers is proposed. The main circuit configuration and inter-bridge current between the two component bridge circuits are investigated. To achieve the reduction of the required carrier frequency without affecting the controllability, a new method of generating PWM pattern is developed. The effectiveness of the proposed control method is confirmed by some experimental results employing a test system.
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