PWM 방식을 이용한 옵셋 전압 주입에 따른 MMC 시스템 내부 에너지 맥동 분석
Analysis of Internal Energy Pulsation in MMC System According to Offset Voltage Injection with PWM Methods
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초록
전압형 컨버터의 다양한 전압 합성 방법을 구현하기 위해서, 옵셋 전압을 주입하는 방법이 널리 사용되고 있다. 즉, 전압변조 방식(pulse width modulation; PWM)들은 교류 측 전압 지령에 적절한 옵셋 전압을 주입하는 것과 수학적으로 동일하다. 이러한 옵셋 전압을 이용한 AC 단 출력 전압 합성 방법에 따라 DC 단 전압의 전압 이용률이 달라지며, 이는 모듈형 다단컨버터(modular multilevel converter; MMC) 시스템에서도 동일하다. 따라서, DC 단의 용량이 정해져 있는 고압 직류(highvoltage DC; HVDC) 송전 시스템의 경우에도 AC 단에 옵셋 전압을 이용함에 따라 AC 단으로 공급 가능한 최대 무효 전력의 크기를 변화시킬 수 있다. 본 논문에서는 대표적인 전압 변조 방식을 적용한 옵셋 전압 주입 시 합성된 AC 측 출력 전압에 따라 MMC 시스템의 레그 에너지 맥동을 수학적으로 분석하였다. 또한, 이를 실제 스케일의 400MVA급 MMC 시스템 시뮬레이션을 통해 수학적 분석의 경향성을 검증하였다.
Abstract
In general, there are various pulse width modulation(PWM) methods simply using the offset voltage injection involtage source converter(VSC). In accordance with the AC side voltage synthesis method with the offset voltage, DCside voltage utilization factor in VSC is changed. Also, this can apply equally to the MMC system. In other words, ifthe DC side capacity of the high voltage DC(HVDC) transmission system is determined, the maximum reactive powerwhich can be supplied to the AC side can be changed according to the applied output voltage synthesis method withthe offset voltage. In this paper, the leg energy pulsation in MMC system according to the AC side output voltagesynthesis method with offset voltage which several representative PWM are applied to are mathematically analyzedand compared with each other. Finally, the above results are verified by simulation emulating the 400MVA full-scaleMMC system to determine the consistency of the mathematical analysis.
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