Abstract
This paper presents various control methods to improve the quality of recently developed power conversion equipment. Compared to diode rectifier, voltage-source PWM converter controls input current in an actively manner and is widely used as a stable power conversion device. A control operation characteristic of a conventional PWM converter is identified. The conventional voltage sensing position to derive the control angle of the PWM converter required for system control is complexly installed in the hardware and the weight increases as the capacity increases because the system includes the L filter. In order to compensate for these drawbacks, the proposed system is configured to have the flexibility of the system by changing the voltage sensing position to the input terminal of the converter. At this time, since the existing control angle and phase voltage must be estimated, the phase voltage at the changed position was followed by the power source side using LPF and DSOGI-PLL, and this was compared and confirmed through a simulation.
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