基于扩展状态观测器的三相PWM整流器控制研究  

Three-phase PWM rectifier control research based on the extended state observer

作　　者：刘俊伟[1] Liu Junwei(Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学,陕西汉中723000

出　　处：《江苏科技信息》2022年第3期42-45,共4页Jiangsu Science and Technology Information

基　　金：陕西理工大学青年基金项目,项目编号:SLG1816,项目名称:陕西省教育厅专项科研计划,项目编号:15JK1120。

摘　　要：三相PWM整流器大多数采用双环PI控制。然而,该控制方法对负载变化不具有良好的适应能力。针对此问题,文章提出在三相PWM整流器的电压外环增加扩展状态观测器,通过扩展状态观测器实时观测负载扰动变化,同时对扰动进行前馈补偿。所提方法无须改变传统三相整流器的总体控制结构,仅通过负载扰动前馈补偿即可有效地改善系统的控制性能。仿真结果表明,与传统的PI控制相比,在负载发生变化时,所提控制方法电压波动小、电压恢复时间短,电网电流THD小,具有更好的负载自适应能力。Most of the three-phase PWM rectifiers adopt dual-loop PI control. However, this control method does not have good adaptability for load disturbance. For this problem, this paper proposes to add an ESO observer in the voltage outer loop of the three-phase PWM rectifier, it can observe load disturbance changes in real time through the Extended-State Observer( ESO) and perform feedforward compensation for the disturbance. The proposed control method does not need to change the overall control structure of the traditional three-phase rectifier and can effectively improves control performance of the system through the load disturbance feedforward compensation. Simulation results show that, compared with the traditional PI control, the proposed control method has less voltage fluctuation and shorter voltage recovery time, smaller grid-current THD and has better load adaptability when load changes.

关 键 词：三相PWM整流器 负载扰动 双环PI控制 ESO 

分 类 号：TM464[电气工程—电器]