대한전기학회논문지 (The Transactions of the Korean Institute of Electrical Engineers)
- 제41권4호
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- Pages.369-378
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- 1992
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- 0254-4172(pISSN)
인버터 시스템과 상용 전력 계통과의 병렬 운전에 관한 연구
A Study on Parallel Operation Between Inverter System and Utility Line
초록
This paper proposes a utility parallel processing inverter system, which consists of a voltage source PWM inverter, isolation transformer and a reactor linking the inverter to utility line. This system realizes following functions : (1) voltage phase frequency and amplitude synchronization between inverter and utility line at stand-alone mode. (2) current phase synchronization between inverter and load at parallel mode. Therefore, despite sudden increase in load current over setting point at stand-alone mode, inverter system can be transferred into parallel mode immediately without transient current. Furthermore, high frequency(18KHz) PWM control and sinusoidal filtering improve the inverter output waveform by eliminating high order harmonic components as well as low order. As a switching device, IGBT is used for high frequency switching and large current capacity.