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Micro-sources mostly connect to converters to output voltage and frequency demanded. PWM converters can improve the generatorspsila power factor to be unit, and produce less harmonics. So PWM converters have good effects on improving the power quality. By changing voltage amplitude and phase of PWM converter, generators may create active and reactive power neatly to meet the load demand. And thus maintain the voltage and frequency stability. In this paper, a PWM converter model is given and a kind of software named PSCAD is used to simulate. The simulation results show that the conclusions above are right.