1-션트 인버터의 고조파 저감을 위한 새로운 상전류 복원에 관한 연구
A study on the novel phase current reconstruction for harmonic reduction of 1-shunt inverter
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초록
본 논문에서는 2-Level 3상 인버터의 DC Link단의 1-션트 저항으로부터 상전류를 복원하는 방법을 제시한다. 이를위해 션트 저항으로부터 정확한 위상 전류를 얻기 위해서는 최소한의 시간이 필요하며 이 시간 때문에 SVPWM의 출력전압 육각형에 측정 할 수 없는 영역이 존재한다. 모터를 제어하기 위해서는 측정 불가능 영역에서도 위상 전류를 복원이 필요하다. 종래의 방법들에서는 SVPWM의 스위칭 패턴을 변경하거나 전압을 인가함으로써 복원한다. 그러나, 이러한방법은 복원된 상전류에서 높은 고조파 특성을 가진다. 상전류의 THD를 줄이기 위해, 본 논문에서는 지령전류에 의한상전류 추정 방법과 최적 전압 주입 방법으로 상전류 복원을 제안한다. 시뮬레이션을 통해 제안한 방법의 타당성과 유효성을 검증하였으며 SPMSM(표면 장착형 영구 자석 동기 모터)에 적용한다.
Abstract
This paper presents the results of a phase current reconstruction method obtained from a DC Link 1-shunt resistor of a 3-phase inverter. An accurate phase current from the shunt resistor can be acquired in a minimal time interval. As a result, there are unmeasurable areas in the output voltage hexagon of space vector pulse width modulation (SVPWM). It is necessary to reconstruct the phase current even in the unmeasurable areas in order to control the motor. In conventional methods, the phase currents are reconstructed by modifying the switching pattern of the SVPWM or injecting the voltages. However, these methods are encumbered by a high total harmonic distortion (THD) in the reconstructed phase current. This paper proposes a phase current reconstruction method using the estimated current and injection of the optical voltage to reduce the THD of the phase current. The feasibility and effectiveness of the proposed method were verified via simulation which was performed on a surface mounted permanent magnet synchronous motor (SPMSM).
참고문헌 (10)
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