三电平中点钳位型变换器线性自抗扰离散建模与稳定控制  

Discrete Modeling and Stability Control of Linear Active Disturbance Rejection Control for Three-Level Neutral Point Clamped Converter

作　　者：伍文俊[1] 蔡雨希 兰雪梅 Wu Wenjun;Cai Yuxi;Lan Xuemei(School of Electrical Engineering,Xi’an University of Technology,Xi’an,710048,China)

机构地区：[1]西安理工大学电气工程学院

出　　处：《电工技术学报》2020年第S01期37-48,共12页Transactions of China Electrotechnical Society

基　　金：陕西省重点学科建设专项基金资助项目（00X1501）

摘　　要：在离散域下,建立三电平并网变换器线性自抗扰控制的数学模型,设计系统的稳定域范围。该方法设计的稳定域范围与控制周期密切相关,将原来无上界的控制器参数的选取范围大大缩小了,对现代广泛使用的数字化控制器设计具有更加实际的指导意义。该文结合三电平并网变换器的仿真,分析控制器参数对观测精度和系统控制性能的影响,确定三电平并网变换器线性自抗扰控制器参数的最佳取值范围。根据设计的离散控制器参数,针对电网电压、并网电抗以及直流侧中点电位等扰动工况,对三电平并网变换器线性自抗扰控制系统进行仿真。结果表明建立的离散控制模型正确,离散控制器参数设计方法可行,参数选择方便、准确;三电平并网变换器线性自抗扰控制器的响应速度快、控制精度高、抗扰能力强。In discrete domain,the mathematical model of three-level NPC grid-connected converter was established in this paper,and its stable domain was designed,in which linear active disturbance rejection control was adopted.The stable domain designed by this method was closely related to the control period,and it was much smaller than the previously unbounded one,that was more significant to guide to project practical digitalized controller.Combining with simulating analyses of three level grid-connected converter,the influences of controller parameters on the observer accuracy and control performance were analyzed,and the optimum parameters range of linear active disturbance rejection controller was determined.According to the designed discrete controller parameters,the linear active disturbance rejection control system of three level grid connected converter was simulated,while these disturbances about grid voltage,grid connected reactance and the neutral point voltage in DC side happened.The simulating results show that the discrete control model was correct in this paper,the designed method was feasible,and the controller parameters were more convenient and accurate to be determined.The linear active disturbance rejection control system of three level grid-connected converter has owned fast response,high control accuracy and good active disturbance rejection disturbance too.

关 键 词：三电平并网变换器 线性自抗扰控制 离散 建模 稳定域 

分 类 号：TM464[电气工程—电器]