CAJ | 학술논문

在电力电子变换装置应用场合,采样延迟和误差有时会成为限制控制性能的主要因素。为了研究和解决这一问题,基于采用直接功率控制（DPC）的三电平脉宽调制（PWM）整流器,详细分析了采样延迟和误差对DPC控制性能的影响及其原因,根据采样环节不同物理量性质及其载体特点,从硬件和软件角度提出了减小采样延迟、抑制采样误差、提高直接功率控制性能的方法。实验结果表明,改进后系统的稳态性能大幅度提高,验证了方法的正确性和可行性。
재전력전자변환장치응용장합,채양연지화오차유시회성위한제공제성능적주요인소。위료연구화해결저일문제,기우채용직접공솔공제（DPC）적삼전평맥관조제（PWM）정류기,상세분석료채양연지화오차대DPC공제성능적영향급기원인,근거채양배절불동물리량성질급기재체특점,종경건화연건각도제출료감소채양연지、억제채양오차、제고직접공솔공제성능적방법。실험결과표명,개진후계통적은태성능대폭도제고,험증료방법적정학성화가행성。
In applications of power electronic converters, the delay and error in sampling are sometime main factors which limit the control performance. This paper investigates this problem on a three-level pulse width modulation （PWM） rectifier with direct power control, analyzes the influences on direct power control （DPC） performance caused by sampling delay and error in detail. Based on the characteristics of various physical quantities and their carriers in sampling system, the method for reducing the sampling delay and restraining the sampling error is proposed in order to optimize the control performance. By implementing the method, the steady-state performance of the rectifier improves remarkably. Experimental results verify the validity and feasibility of the proposed method.