Z源PWM整流器直流侧控制策略的研究
三相电压型Z源PWM整流器既能实现传统PWM整流器的功能,又能实现输出电压的降压变换,并提高了桥臂开关管的抗干扰能力。将Z源整流器等效为交流侧PWM整流和直流侧Z源网络降压变换两级控制系统,重点研究了直流侧的状态空间平均建模方法,得到了系统的小信号控制模型,并推导了从直通占空比到输出电压的传递函数。针对直流侧Z源网络采用电压单闭环控制系统时,输出电压纹波大、稳定性差的问题,提出了引入Z源网络电感电流内环与输出电压外环的双闭环控制系统,并分析了双闭环PI调节器的参数设计方法。仿真和实验结果表明,所建立的Z源整流器模型以及控制系统的设计是正确可行的。...
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| Published in | 电机与控制学报 Vol. 19; no. 1; pp. 16 - 22 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
哈尔滨工业大学 电气工程及自动化学院,黑龙江 哈尔滨,150001
2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1007-449X |
| DOI | 10.15938/j.emc.2015.01.003 |
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| Summary: | 三相电压型Z源PWM整流器既能实现传统PWM整流器的功能,又能实现输出电压的降压变换,并提高了桥臂开关管的抗干扰能力。将Z源整流器等效为交流侧PWM整流和直流侧Z源网络降压变换两级控制系统,重点研究了直流侧的状态空间平均建模方法,得到了系统的小信号控制模型,并推导了从直通占空比到输出电压的传递函数。针对直流侧Z源网络采用电压单闭环控制系统时,输出电压纹波大、稳定性差的问题,提出了引入Z源网络电感电流内环与输出电压外环的双闭环控制系统,并分析了双闭环PI调节器的参数设计方法。仿真和实验结果表明,所建立的Z源整流器模型以及控制系统的设计是正确可行的。 |
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| Bibliography: | Z-source;rectifier;control strategy;small signal model;shoot-through zero vector;buck conversion 23-1408/TM LIU Bo, BEN Hong-qi, MENG Tao （School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001 , China） Three phase voltage source Z-source PWM rectifier can not only achieve conventional PWM rectifier’ s function, but also achieve the output voltage buck conversion, and improve the anti-jamming capability of leg-switching tube. The Z-source PWM rectifier is equivalent to two control systems： the PWM rectifier of AC side and the Z-source network buck conversion of DC side. Focus of the study was the state space average modeling approach of DC side. Then the small-signal control system model and the transfer function from shoot-through duty to output voltage were obtained. For the problems of output voltage’ s large ripple and poor stability when DC-side Z-source network used voltage single-loop control system, a double-loop control system was proposed which contains inner loo |
| ISSN: | 1007-449X |
| DOI: | 10.15938/j.emc.2015.01.003 |