摘要
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。
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.
出处
《电工技术学报》
EI
CSCD
北大核心
2010年第3期66-72,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点资助项目(50737002)
