Pulse Width Modulation Control of a Direct ...

This paper presents pulse width modulation technique for a direct ac-ac converter. The converter has five-phase input supply and three-phase output. The input supply may be obtained from a five-phase wind energy generation system with variable output voltage magnitude and frequency. The output of the proposed converter topology may be fed to the three-phase stiff grid system. Thus the requirement of the modulation of the ac-ac converter is to produce fixed voltage and fixed frequency output while the input can be variable. Additionally the output voltage gain should be high. Simple carrier-based PWM technique is suggested and harmonic injection scheme is proposed to enhance the output voltage magnitude. The output voltage reaches 89.2% of the input supply voltage with the proposed technique. An additional control block is used to stabilize the output voltage and frequency of the converter. Simulation and experimental results are shown in the paper for the verification of the proposed scheme.