高压大容量直流变压器模块化离散解耦等效建模方法  

Modular Discrete Decoupling Equivalent Modeling Method for High-voltage Large-capacity DC Transformer

作　　者：安峰 崔彬 白睿航 许建中 赵彪[1] 宋强[1] AN Feng;CUI Bin;BAI Ruihang;XU Jianzhong;ZHAO Biao;SONG Qiang(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]新能源电力系统国家重点实验室(华北电力大学),北京市102206

出　　处：《电力系统自动化》2021年第7期79-86,共8页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(XT71-18-030)。

摘　　要：高压大容量直流变压器是直流电网的重要设备,在可再生能源汇集与直流系统互联等能量变换环节中具有关键作用。为了在降低建模复杂度的同时保留详细模型的所有电气特性,文中提出了一种模块化离散解耦等效建模方法,以实现高压大容量直流变压器的快速电磁暂态仿真分析。该方法通过引入受控源传递二次信息以实现直流变压器子模块外部端口与内部端口的离散解耦,从而将系统中的高维度节点导纳矩阵转换为多个低维度的子系统进行同时求解以实现仿真提速。所提出的等效模型不仅建模方法简单且保留了详细模型所有电气特性,同时可以准确地仿真直流变压器系统的暂态、稳态特性及一些特殊的运行工况,包括:预充电、直流短路故障及传输功率反转等,并显著地缩短了仿真时间、提高了仿真效率。最后,通过PSCAD/EMTDC仿真分析验证了所提出的建模方法的正确性与有效性。The high-voltage large-capacity DC transformer(DCT)is important equipment of the DC grid and plays a key role in renewable energy collection and DC system interconnection.In order to realize fast electromagnetic transient simulation analysis of the DCT on the premise of reducing modelling complexity and keeping all electrical characteristics of the detailed model,a modular discrete decoupling equivalent modeling method is proposed in this paper.In this method,the controlled source is introduced to transfer the secondary information so as to realize the discrete decoupling between the external port and the internal port in the submodules of the DCT.Thus,the high-dimensional admittance matrix of the system is divided into the low dimensional matrices which can be solved simultaneously to speed up the simulation.The proposed equivalent model not only has a simple modeling process,but also retains all the electrical characteristics of the detailed model.At the same time,it can accurately simulate the transient and steady-state characteristics of the DCT system,as well as some special operation conditions,including pre-charging,DC short-circuit faults and power reversals.It also significantly reduces the simulation time and improves the simulation efficiency.Finally,the correctness and effectiveness of the proposed modelling method are verified by PSCAD/EMTDC simulation analysis.

关 键 词：高压大容量直流变压器 等效建模 电磁暂态分析 仿真效率 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM40