面向柔直换流站高频谐振问题的换流变压器建模与参数辨识  

Modeling and Parameter Identification of Converter Transformer for High-Frequency Resonance Problem of Flexible DC Converter Station

作　　者：胡应宏 李雨 李阳[2] 陈继开[2] 张扬[3] Hu Yinghong;Li Yu;Li Yang;Chen Jikai;Zhang Yang(Electric Power Research Institute of State Grid Jibei ElectricPower Co.Ltd,Beijing,100045,China;Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education Northeast Electric Power University,Jilin,132012,China;School of Electrical Engineering Nanchang Institute of Technology,Nanchang,330099,China)

机构地区：[1]国网冀北电力有限公司电力科学研究院,北京100045 [2]东北电力大学现代电力系统仿真控制与绿色电能新技术教育部重点实验室,吉林132012 [3]南昌工程学院电气工程学院,南昌330099

出　　处：《电工技术学报》2024年第22期7154-7166,共13页Transactions of China Electrotechnical Society

基　　金：国网冀北电力有限公司科技资助项目(52018K22001C)。

摘　　要：围绕张北柔直康保站空母线高频谐振问题,重点研究换流变压器在高频段呈现的阻抗特性与建模方法,并应用于模块化多电平换流器(MMC)空母线高频谐振问题的分析。首先介绍换流变压器的高频特性,建立考虑电容效应的换流变压器高频等效模型;其次基于康保站换流变压器实测的频率响应数据,利用改进鲍威尔算法反演计算得到换流变压器的高频等效模型参数,并与实测数据进行对比,校验换流变压器关键参数并确定模型适用范围;再次分析换流变压器等效电容参数对其高频阻抗的影响规律;最后基于换流变压器高频等效模型,仿真复现康保站MMC空母线高频谐振现象,验证了所建换流变压器高频等效模型的准确性以及对研究MMC空母线高频谐振的重要性。In December 2020,a high-frequency resonance of around 3200 Hz occurred during the no-load starting process of Kangbao station,triggering high-frequency component protection,which resulted in the converter station blockage and system trip.When the resonance occurred,the converter station charged the converter transformer.However,the bus was not connected to any AC overhead line,which means that the converter transformer participated in the high-frequency resonance of a modular multilevel converter(MMC)with the no-load bus.The modeling method that the converter transformer is equivalent to the leakage reactance can not reflect the high-frequency characteristics of the converter transformer,failing to analyze this high-frequency resonance accurately.For the high-frequency resonance problem in Zhangbei Kangbao MMC with the no-load bus,the research focuses on the physical characteristics of the converter transformer and the modeling method in the high-frequency range.Firstly,the high-frequency equivalent model is established considering the interturn capacitance,the coupling capacitance,and the capacitance to ground.The high-frequency model of the converter transformer is simplified by neglecting the capacitance to ground.Then,based on the measured frequency response data of the Kangbao converter transformer,the improved Powell algorithm is used to calculate the high-frequency equivalent model parameters.The critical parameters are checked,and the application scope of the model is determined.Moreover,the effects of equivalent capacitance parameters on the high-frequency impedance of the converter transformer are analyzed.Finally,based on the high-frequency equivalent model,the high-frequency resonance phenomenon is reproduced in Kangbao MMC with the no-load bus.The simulation results verify the accuracy of the equivalent model.Different from the power frequency model,interturn and coupling capacitances should be considered in converter transformer modeling at the high-frequency band.The capacitance effect makes the eq

关 键 词：换流变压器 高频等效模型 反演计算 高频谐振 模块化多电平换流器 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM41