线电压调制的PWM逆变器相电流重构策略  

Phase current reconstruction strategy for PWM inverter based on line voltage modulation

作　　者：程明[1] 姜云磊 王伟[1] 王青松[1] 

机构地区：[1]东南大学电气工程学院,江苏南京210096

出　　处：《电机与控制学报》2018年第2期9-16,共8页Electric Machines and Control

基　　金：国家自然科学基金重大国际(地区)合作研究项目(51320105002);国家重点基础研究发展计划项目(973项目)(2013CB035603)

摘　　要：为了实现脉冲宽度调制(pulse width modulation,PWM)逆变器驱动系统在相电流传感器故障情况下的容错运行,提出了一种基于线电压调制的相电流重构策略。首先根据线电压调制的原理得到电机三相占空比;然后,从占空比合理分布的角度对三相占空比进行调整;最后,依据伏秒原则,根据一个开关周期内总占空比不变的原则计算出补偿占空比。分析了母线电流成分并指出了缓冲电路与母线寄生参数对电流重构性能的影响,在此基础上提出的π型缓冲电路,能够在保证电路性能的前提下,最大限度地减少缓冲电路对相电流重构性能的影响。最后进行了实验研究,证明了所提出的相电流容错控制方法的正确性和可靠性。To ensure that pulse width modulation （PWM） inverter driving system can operate reliably once faults of phase current sensors occur, a phase current fault tolerant method based on line voltage modulation is proposed. Considering the principles of line voltages modulation, duty cycles of three bridges was calculated firstly.Then, duty cycles were rearranged in order to meet the sampling requirements by applying modification to the calculation results.Finally, compensation duty cycles were obtained for the purpose of balancing the changes added. Besides, causes of reconstructed current errors were analyzed in detail and a modified π type snubber circuit was given, which aims to eliminate current errors from the resonant process between DC link and cushion capacitance while performance of snubber circuit was kept to a large extent. The effectiveness and reliability of the proposed fault tolerant method are verified by both simulated and experimental results.

关 键 词：PWM逆变器 相电流传感器 容错控制 线电压调制 

分 类 号：TM921.51[电气工程—电力电子与电力传动]