变流器输出端RLC-plus-C新型过电压滤波器研究  

Research on novel overvoltage filter of RLC-plus-C at converter output

作　　者：郑海旺 何山[1] 王维庆[1] 王冉旭 董佳林 董广凯 Zheng Haiwang;He Shan;Wang Weiqing;Wang Ranxu;Dong Jialin;Dong Guangkai(Research Center for Renewable Energy Generation and Grid Control Engineering,Ministry of Education,School of Electrical Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学电气工程学院(教育部可再生能源发电与并网控制工程研究中心),乌鲁木齐830047

出　　处：《电测与仪表》2022年第12期124-130,共7页Electrical Measurement & Instrumentation

基　　金：新疆维吾尔自治区重点研发项目(2022B01003-3);新疆维吾尔自治区重点实验室开放课题项目(2022D04029);国家重点研发计划项目(2021YFB1506902)。

摘　　要：为进一步抑制永磁风电机组PWM变流器高频脉冲波经长电缆传输反射造成的机侧过电压,并降低电机轴承电流,文章基于共模电流衰减法,提出一种新型RLC-plus-C无源滤波器及其设计方法。首先建立长电缆传输等效电路模型,分析过电压产生机理,引入传递函数,优化滤波器参数。其次对新型滤波器的参数R_(f)、C_(c)和C_(f)进行设计,在此基础上,针对电感L_(f)的取值在Matlab中设计一套完整的计算方法。最后通过Matlab/simulink软件搭建PWM变流器-长电缆-发电机的仿真模型,引入新型滤波器,分析其过电压抑制效果,轴承电流衰减量以及功率损耗,并对比RLC和RL-C滤波器。结果表明:RLC-plus-C滤波器进一步抑制了机端过电压,同时显著地降低了轴承电流。In order to further suppress the over-voltage on the generator side caused by the high frequency pulse wave of the PWM converter of the permanent magnet wind turbine transmitted through the long cable and reduce the motor bearing current,a novel type of RLC-plus-C source passive filter and its design method is proposed in this paper.Firstly,an equivalent circuit model for long cable transmission is established,the overvoltage generation mechanism is analyzed,the transfer function is introduced,and the filter parameters are optimized.Secondly,the parameters of the novel filter R_(f),C_(c)and C_(f)are designed.Based on this,a complete calculation method is designed in Matlab for the value of the inductance L_(f).Finally,a simulation model of PWM converter-long cable-generator is built by Matlab/simulink software.A novel type of filter is introduced to analyze its overvoltage suppression effect,bearing current attenuation and power loss,and compare RLC with RL-C_(f)ilters.The results show that the RLC-plus-C_(f)ilter further suppresses the over-voltage at the machine end and significantly reduces the bearing current.

关 键 词：永磁风电机组 RLC-plus-C 过电压 轴承电流 功率损耗 

分 类 号：TM614[电气工程—电力系统及自动化]