基于直流系统故障响应特征的机电暂态建模方法  

Electromechanical Transient Modeling Method Based on HVDC Fault Response Characteristics

作　　者：朱林[1] 陈宇川[1] 蔡泽祥[1] 苏海林[1] 杨欢欢[1] 金小明 周保荣 张东辉 

机构地区：[1]华南理工大学电力学院,广州市510640 [2]南方电网科学研究院,广州市510080

出　　处：《电力建设》2016年第2期18-24,共7页Electric Power Construction

基　　金：国家自然科学基金项目(51407079)~~

摘　　要：针对机电暂态下直流及其控制系统模型不能反映实际系统动态特性的问题,提出了一种基于直流电压故障响应特征的直流系统建模新方法。分析了直流系统机电暂态模型与电磁暂态模型的差异,确定了影响直流系统动态特性的关键性因素。进而提出利用直流系统电磁暂态模型在故障期间的特征,来改善机电暂态模型的关键思路。最后,借助PSCAD/EMTDC下的详细仿真,提炼了直流电压故障响应特征,并以交流系统故障类型和换流母线电压跌落情况为条件,将该响应特征引入机电暂态直流换流器模型中。利用所提方法在PSS/E环境下搭建了直流系统的自定义模型,相关仿真结果验证了建模方法的实用性。Aiming at the dynamic characteristics of HVDC and its control model in electromechanical transient simulation unable to correspond accurately with the ones of actual systems, this paper proposes a HVDC modeling method based on DC voltage fault response characteristics. Firstly, we analyze the differences between the electromechanical transient model and electromagnetic transient model of DC system, and identify the key factor that influences HVDC dynamic characteristics. Secondly, we present the key idea which utilizes the characteristics of HVDC electromagnetic transient model under fault to improve the electromechanical transient model. Finally, based on the detailed simulation in PSCAD/EMTDC, we extract the fault response characteristics of DC voltage, and introduce the response characteristics into the electromechanical transient model of DC converter according to AC system fault type and converter bus voltage variation. Based on the method, a user- defined HVDC model has been built in PSS/E, and the simulation results verify the practicality of the modeling method.

关 键 词：直流系统 故障响应特征 自定义建模 机电暂态 PSS/E 

分 类 号：TM743[电气工程—电力系统及自动化]