弱电网下三相CSR并联耦合及其稳定性研究  

Parallel Coupling and Stability of Three-phase Current-source PWM Rectifier Under Weak Grid

作　　者：陈斌 彭元修[1] 李俊[1] 刘斌[1] 蔡木良 范瑞祥 CHEN Bin;PENG Yuan-xiu;LI Jun;LIU Bin;CAI Mu-liang;FAN Rui-xiang(School of Information Engineering,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Electric Power Research Institute of State Grid Corporation of China,Nanchang 330077,China;Jiangxi Key Laboratory of New Energy Power System Operation Control,Nanchang 330000,China)

机构地区：[1]南昌航空大学信息工程学院,南昌330063 [2]国网江西省电力有限公司电力科学研究院,南昌330077 [3]江西省新能源电力系统运行控制重点实验室,南昌330000

出　　处：《南昌航空大学学报（自然科学版）》2023年第1期68-76,共9页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：国家自然科学基金(61963030);省政府重点研发计划(20223BBE51013)。

摘　　要：三相电流型PWM整流器(CSR)在整流过程中的输入电流为脉冲状,通常需在交流侧加入滤波器来进行谐波抑制。但在弱电网下,电网阻抗不可忽略,使得CSR通过滤波器产生耦合,进而引发谐振。本文对弱电网下三相电流型PWM整流器的稳定性进行研究,针对弱电网下CLC滤波器谐振问题提出一种有源阻尼控制策略。同时发现弱电网下多CSR并联在电网阻抗及节点电压影响下相互耦合的谐振问题更加严重,由此建立输入输出关系耦合矩阵对系统谐振问题进行分析。最后通过仿真和实验结果,验证了本文所提控制方法的有效性。The input current of three-phase current type PWM rectifier(CSR)is pulse in the rectification process,and the filter is usually added to the AC side to suppress the harmonics.However,in the weak current network,the grid impedance cannot be ignored,which makes CSR couple through the filter,thereby causing resonance.In this work,the stability of three-phase current source PWM rectifier in weak power grid was studied,and an active damping control strategy was proposed for the resonance of CLC filter.At the same time,influenced by the grid impedance and node voltage in weak current networks,the resonance problem of multiple CSRs coupled in parallel is much more serious.Therefore,the input-output coupling matrix is established to analyze the system resonance problem.Finally,the effectiveness of the control method herein is verified by the simulation and experimental results.

关 键 词：CSR 谐波抑制 CLC滤波器 有源阻尼 并联稳定性 

分 类 号：TM461[电气工程—电器]