一种实用的电压源型换流器及直流电网机电暂态建模方法  

A Practical Modeling Method of VSC-HVDC and DC-Grid Electromechanical Transient

作　　者：丁平[1] 安宁[1] 赵敏[1] 徐希望[1] 江涵[1] Ding Ping;An Ning;Zhao Min;Xu Xiwang;Jiang Han(China Electric Power Research Institute Beijing 100192 China)

机构地区：[1]中国电力科学研究院,北京100192

出　　处：《电工技术学报》2017年第10期69-76,共8页Transactions of China Electrotechnical Society

基　　金：国家电网公司科技项目(电压源换流器与直流电网建模仿真与协调控制的基础理论)

摘　　要：提出一种在大规模机电暂态仿真中建立电压源型换流器和直流电网模型的实用方法。阐述建立该模型的原则、各部分实现方法以及主要功能,并通过如下步骤实现所提方法。VSC换流器模型与机电暂态网络分别采用不同积分步长的模型接口;无源孤岛的频率控制方法;换相阻抗支路d、q轴电流解耦计算;考虑电磁特性的直流网络积分处理方法以及保证调节快速平稳的措施。给出完整的VSC换流器和直流电网解算流程。最后通过与PSCAD中搭建的MMC-HVDC电磁暂态模型对比等算例证明了所提方法的有效性。A practical modeling method of VSC-HVDC and DC-grid electromechanical transient in simulating bulk grid was put forward.The principle of building,the way realizing of each element and the major function of this model were stated.The practical processing was created as follow:interfaces with different integration step lengths used by VSC-HVDC and AC grid respectively,the way controlling frequency in isolated electric island,decoupling calculation of d-axis and q-axis current on phase impedance,integration of DC-grid including property of electromagnetic transient,and measures assuring fast and smooth regulation.Flow chart of whole calculation on VSC-HVDC and DC-grid in one small step was given.Comparisons of MMC-HVDC transmission system electromagnetic transient models in PSCAD and others indicate the validity of this model.

关 键 词：电压源换流器型高压直流输电 直流电网 机电暂态 接口 建模方法 

分 类 号：TM74[电气工程—电力系统及自动化]