This paper proposes a boost type inverter system to compensate the voltage sag has appeared in voltage sources. If the voltage sag has appeared in input voltage, a boost converter would be operated to compensate it in the boost type inverter system. The boost converter would not be operated when the magnitude of input voltage is more than 90 %, and the output voltage is kept constant by a direct-quadrature frame controller in the single-phase PWM inverter. A 300 W class boost type inverter system was simulated, and the validity of the proposed system was verified by carrying out experiments.
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