基于NCAV和电路等效替换的PWM整流器容错控制系统  

Fault-tolerant Control System of PWM Rectifier Based on NCAV and Circuit Equivalent Replacement

作　　者：秦伟[1] 冯延晖[1] 黄凯[1] 邱颖宁[1] QIN Wei;FENG Yanhui;HUANG Kai;QIU Yingning(Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学,江苏南京210094

出　　处：《电力工程技术》2017年第6期84-89,131,共7页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51505225);江苏省自然科学基金资助项目(BK20131350);中央高校基本科研业务费专项资金资助项目(30915011324)

摘　　要：三相脉冲宽度调制(pulse width modulation,PWM)整流器因其具有可控的功率因数、网侧三相电流趋于正弦、直流侧电压稳定等优点,在电机控制、风力发电并网、柔性直流输电和微电网等领域得到广泛应用。为了提高三相PWM整流器可靠性,文中提出了一种PWM整流器容错控制系统,该系统结合了归一化电流平均值(normalised current average value,NCAV)故障检测法和基于电路等效替换的容错方法。该控制系统在功率开关管单管开路故障情况下能够实现故障检测和诊断,并进行快速的容错控制,从而减少单管开路故障对系统造成的影响,改善故障下三相电流波形,减小输出电压纹波,提升系统的整体性能和可靠性。通过仿真验证了该控制系统的有效性。Three-phase pulse width modulation(PWM)rectifier is widely used in motor control,wind power generation,flexible HVDC and micro grid due to the controllable power factor,sinusoidal grid side three-phase current waveform,stable DC side voltage and so on.In order to improve the reliability of three-phase PWM rectifier,a PWM fault-tolerant control system based on NCAV fault detection method is proposed in this paper.The control system can implement fault-tolerant control in a short time in the case of an open circuit fault has occurred on a single power switch,reduce the impact to the system caused by the single open circuit fault.This system can effectively improve the three-phase current waveform,reduce the output voltage ripple and enhance the overall system performance and reliability when an open circuit fault has occurred on a single power switch.The usefulness of this paper is verified through simulation results.

关 键 词：整流器 开路故障 故障诊断 容错控制 

分 类 号：TM461[电气工程—电器]