3레벨 인버터로 구동되는 IPMSM의 고주파 주입센서리스 운전에서 중성점 전압 리플 저감
Neutral-Point Voltage Ripple Reduction of High Frequency Injection Sensorless Control of IPMSM Fed by a Three-Level Inverter
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초록
본 논문에서는 3레벨 인버터로 구동되는 IPMSM의 고주파 주입 센서리스 운전에서 중성점 전압 리플 저감을 제안한다. 고주파 전압 주입 기반의 센서리스 제어는 IPMSM의 저속 영역에서 일반적으로 사용하는 센서리스 제어 기법이다. 고주파 전압 주입을 이용한 IPMSM의 센서리스 제어 과정에서 중성점에서의 전압 리플이 증가하는 문제가 발생한다. 중성점에서의큰 전압 리플은 출력 전류를 왜곡시킬 뿐만 아니라 직류단 커패시터의 수명을 단축시키므로 저감되어야 한다. 본 논문에서제안하는 기법은 지령 전압에 적절한 값을 보상하여 중성점 전압 리플을 저감하며, 보상값은 지령 전압과 전류를 이용하여간단히 계산한다. 제안하는 중성점 전압 리플 저감 기법의 타당성은 시뮬레이션을 통해 검증한다.
Abstract
This paper proposes a neutral-point voltage ripple reduction of high frequency injection sensorless control of IPMSMfed by a three-level inverter. The high frequency voltage injection method has been successfully applied to sensorlesscontrol for IPMSM at low speed region. In the process of high frequency voltage injection sensorless control for IPMSM,the neutral-point voltage ripple is increased. It should be reduced because it distorts the output current and decreases alife time of DC-link capacitor. The proposed method in this paper reduces the neutral-point voltage ripple by compensatingthe reference voltage, and the compensation value is calculated simply with reference voltages and currents. Theeffectiveness of the proposed method is verified by simulation results.
참고문헌 (18)
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