不平衡电网电压下精简矩阵变换器扩展直接功率模型预测控制  

Extended Direct Power Model Predictive Control for Reduced Matrix Converter Under Unbalanced Grid Voltage Operation Condition

作　　者：韩思鹏 宋卫章[1] 胥少杰 李佳耿 杜晓斌 Han Sipeng;Song Weizhang;Xu Shaojie;Li Jiageng;Du Xiaobin(School of Electrical Engineering and Automation 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,西安710048

出　　处：《电工技术学报》2023年第S01期147-156,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51877176);陕西省重点研发计划一般项目(2021GY-293);陕西省教育厅服务地方专项计划项目(18JC024);西安市科技计划项目(22GXFW0085)资助。

摘　　要：针对精简矩阵变换器(RMC)传统直接功率预测控制在电网电压不平衡工况下网侧电流畸变严重、输入功率和直流侧输出电压存在较大波动的问题。该文提出一种适用于RMC的扩展直接功率预测控制方法。推导分析不平衡输入电压下有功功率和无功功率的二倍频波动表达式,利用1/4电网周期延迟法提取电网电压、电流正负序分量,采用扩展瞬时功率理论重新构建瞬时功率的参考值,实现网侧功率和直流电压纹波波动的自抑制,最后搭建一台实验样机对所提方法进行了验证。实验结果表明,电网电压不平衡下所提方法使直流侧输出电压、有功功率和无功功率波动相较传统直接功率预测得到了有效抑制,实现了RMC网侧电流正弦且单位功率因数运行,验证了所提出方法的有效性和正确性。Aiming at the abnormal condition of unbalanced grid voltage,the grid side of RMC has double frequency power pulsation.The active and reactive power in RMC cannot track the power reference value at the same time,whose pulsation cannot also be eliminated using the instantaneous reactive power control strategy of traditional direct power prediction,thus leads to current distortion in grid side and instability in DC side.The topology of RMC is different from the three-phase PWM rectifier because a high-frequency transformer is used to couple the front and rear stages.The method is not applicable completely.Therefore,the problem of larger pulsation it must be solved.In order to solve the above problems,this paper proposes an extended direct power predictive control method in an RMC system.Firstly,the double frequency fluctuation expressions of active and reactive power under unbalanced input voltage are derived and analyzed.The positive and negative sequence components of grid voltage and current are extracted by using the quarter grid cycle delay method.Secondly,an extended instantaneous power theory more suitable for unbalanced power grid is introduced,and a model predictive extended power control method is proposed.By reconstructing the reference value of instantaneous power,the self-suppression of grid side power and DC voltage ripple fluctuation is realized.Then,aiming at the problem that the input active power still contains large pulsation when the extended power predictive control under unbalanced grid voltage,the adjacent two-beat error of the active power is added to the cost function on the minimum cost function of the model predictive control to reduce the error of active power tracking.The new cost function is constructed to suppress the input active power pulsation and suppress the grid side current distortion under unbalanced grid voltage conditions.Finally,the effectiveness of proposed method was verified in an RMC experimental prototype.A comparative experiment between the traditional direct power pre

关 键 词：精简矩阵变换器 直接功率预测控制 电网非正常工况 扩展功率控制 

分 类 号：TM461[电气工程—电器]