三相Vienna整流器无网压传感器预测电流控制策略  

Predictive Current Control of Three-Phase Vienna Rectifier Without Grid Voltage Sensors

作　　者：肖蕙蕙 苏新柱 郭强 李山 陈岚 Xiao Huihui;Su Xinzhu;Guo Qiang;Li Shan;Chen Lan(School of Electrical and Electronic Engineering Chongqing University of Technology,Chongqing 400054 China;Chongqing Engineering Research Center of Energy Internet,Chongqing 400054 China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054 [2]重庆市能源互联网工程技术研究中心,重庆400054

出　　处：《电工技术学报》2021年第6期1304-1312,共9页Transactions of China Electrotechnical Society

基　　金：重庆市基础科学与前沿技术研究项目(cstc2016jcyj A1527);重庆市教委科学技术研究项目(KJZD-K201901102)资助。

摘　　要：设计三相Vienna整流器的闭环控制系统时需要采集电网电压信息,而使用传感器会增加系统硬件成本和复杂度,为此该文提出一种适用于三相Vienna整流器的无网压传感器控制策略。首先,在两相静止坐标系中建立三相Vienna整流器的虚拟磁链数学模型,利用二阶低通滤波器来改进电压观测器,对电网电压进行估算,在不增加算法复杂性的前提下避免了纯积分运算。其次,由于该方法估算的电网电压存在一定误差,因此运用预测电流控制策略构建控制系统,并针对实际系统中采集与处理环节所引起的信号滞后问题,提出二步预测电流法以补偿信号滞后。最后,对所提出控制策略进行仿真分析和实验验证。其结果表明,网侧输入电流谐波含量低,直流侧输出电压准确跟踪给定值,保持单位功率因数运行,系统具有良好的动态、稳态性能,从而验证了该文所提策略的正确性和可行性。Designing the closed loop control system of the Vienna rectifier requires the collection of grid voltage information.However,the use of sensors will increase the cost and complexity of the system hardware.Therefore,a grid voltage sensorless control strategy for Vienna rectifier is proposed.Firstly,the virtual flux mathematical model of the Vienna rectifier was established in the two-phase static coordinate system,and the second-order low-pass filter was used to improve the voltage observer and estimate the grid voltage,which avoids the pure integral operation without increasing the algorithm complexity.Secondly,because the grid voltage estimated by this algorithm has errors,the predictive current control strategy is used to construct the control system.Aiming at the signal lag problem in the acquisition and processing stage of the actual system,a two-step predictive current method is proposed.Finally,the control strategy is proposed for the simulation analysis and experimental verification.The results show that the grid side input current has low harmonic content,the DC output voltage can accurately track the given value and keep running unit power factor, and the system has good dynamicand steady state performance.

关 键 词：VIENNA整流器 无网压传感器 虚拟磁链 预测电流控制 

分 类 号：TM461[电气工程—电器]