파라미터 보정을 가지는 풍력 동기발전기의 센서리스 최대전력 제어
Sensorless maximum power control of wind power synchronous generator with compensated parameter
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초록
풍력발전용 영구자석 동기발전기의 전력제어를 위해서는 회전자의 속도 및 위치 정보가 반드시 요구된다. 그러나위치 및 속도 센서들은 경제적인 문제점, 추가적인 센서의 부착 공간, 취약한 환경에서 신뢰도 감소 등의 단점을 가진다. 따라서 이러한 문제점들을 개선하기 위하여 회전자의 위치 검출기나 속도 센서가 없는 센서리스 제어 방식이 많이 연구되고 있다. 본 논문은 풍력발전용 동기발전기의 최대전력 제어에서 위치 및 속도센서를 제거하는 센서리스 제어에 관한연구이다. 대부분의 센서리스 제어 방식은 전압방정식으로부터 역기전력 정보와 속도 정보를 구하게 된다. 따라서 파라미터 오차는 센서리스 제어 성능에 큰 영향을 미치게 된다. 본 논문에서는 영구자석 동기발전기의 센서리스 제어 성능을 개선하기 위해 역기전력 상수의 오차를 d축 전류의 측정치와 추정치를 이용하여 보상하는 방식을 제안하고 시뮬레이션과 실험을 통해 본 논문에서 제안한 방식을 검증한다.
Abstract
The power control of a permanent magnet synchronous generator for the wind power generation is typically implemented through measuring the rotor speed or position. However, speed and position sensors require additional mounting space, reduce their reliability in harsh environments, and increase the cost of a generator. Various control algorithms for the elimination of speed and position sensors have been proposed. This paper investigates a sensorless control that eliminates the position and speed sensors in the maximum power control of a permanent magnet synchronous generator for the wind power generation system. Most sensorless control algorithms are based on the back-EMF and speed estimations obtained from voltage equations. Therefore, the sensorless control performance is largely affected by the parameter error of a generator. A novel sensorless control with the parameter compensation is proposed for the maximum power control in this paper. The proposed parameter compensation is obtained from the d-axis current error between the real and estimated currents. The proposed algorithm is verified through simulations and experiments.
참고문헌 (16)
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