改进一阶LADRC的微网逆变器零序环流抑制  

Improved Zero-sequence Circulating Current Suppression of First-order LADRC Microgrid Inverter

作　　者：周雪松[1] 郭凯瑞 马幼捷[1] 钟伟宝 ZHOU Xuesong;GUO Kairui;MAYoujie;ZHONG Weibao(Tianjin Key Laboratory for Control and Application in Complicated Systems,Tianjin University of Technology,Tianjin 300384,China;School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学天津市复杂控制理论重点实验室,天津300384 [2]天津理工大学电气电子工程学院,天津300384

出　　处：《电气传动》2022年第23期28-35,共8页Electric Drive

基　　金：国家自然科学基金面上项目(51877152);天津自然科学基金(18JCZDJC97300)。

摘　　要：微网系统中逆变器并联使得系统容量增加,但也形成了环流通路,提供了零序环流(ZSCC)产生的条件。为解决系统中零序环流引起的损耗问题,设计了零序环流控制器。该控制器在传统线性自抗扰控制(LADRC)的基础上,改进了线性状态误差反馈(LSEF)控制律,增加了对总扰动估计误差的补偿,提高了控制器的性能。从而得到准确的零矢量分配因子调节占空比,消除逆变器之间的差异,抑制零序环流。最后通过理论分析说明了改进型LADRC的抗扰性以及系统的稳定性,仿真结果验证了该控制策略对零序环流抑制的参考作用。Although the parallel connection of inverters in a microgrid system increases the system capacity,it creates a circulation path which provides the conditions for the generation of zero-sequence circulating current(ZSCC).In order to solve the problem of system loss caused by ZSCC,a ZSCC controller was designed.Based on the traditional linear active disturbance rejection control(LADRC),in the proposed controller,the linear state error feedback(LSEF)control law was improved,the compensation for the total disturbance estimation error was increased,and the performance of the controller was enhanced.Thus,the accurate zero-vector allocation factor could be obtained to adjust duty cycle,eliminate the difference between inverters,and then suppress ZSCC.Finally,the immunity of the improved LADRC and the stability of the system were illustrated through theoretical analysis.The simulation results verify the reference effect of the control strategy on the suppression of ZSCC.

关 键 词：微网 逆变器并联 零序环流 线性自抗扰控制 零矢量分配因子 

分 类 号：TM464[电气工程—电器]