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중성점 전압 리플 저감이 가능한 3-레벨 NPC 인버터의 새로운 DPWM 방법

A New Discontinuous PWM Method of a Three-Level NPC Inverter for Neutral-Point Voltage Ripple Reduction

초록/요약

A new pulse width modulation (PWM) strategy which is an alternative approach of the discontinuous PWM (DPWM) for a three-level neutral-point-clamped (NPC) inverter is proposed in this paper. A three-level NPC inverter is completely mature and very well established topology in high-power applications. However, the three-level NPC inverter has the inherent problem of neutral-point voltage unbalancing due to the split dc-link capacitors. This structure can cause the large neutral-point voltage ripple. Furthermore, output currents of the three-level NPC inverter can be distorted by the neutral-point voltage ripple. Since the influence of the neutral-point voltage ripple to output, it must be controlled. In this paper, a new DPWM method using two different offsets for the neutral-point ripple reduction is proposed and the effectiveness of the proposed DPWM method is verified by using the simulation and the experimental results.

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목차

제 1 장 서론 1
제 2 장 3-레벨 NPC 인버터 4
제 3 장 기존의 DPWM 기법 8
제 4 장 제안하는 DPWM 기법 10
4.1. 중성점 전류에 대한 분석 10
4.2. MI 0.5 이상에서의 제안하는 DPWM 기법 12
4.3. MI 0.5 이하에서의 제안하는 DPWM 기법 16
4.4. 각 모듈레이션 기법 별 손실 분석 20
제 5 장 시뮬레이션 결과 22
제 6 장 실험 결과 27
제 7 장 결론 31
참고문헌 32

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