计及换流站控制特性的多端混合直流输电系统故障暂态计算方法  

Fault Transient Calculation Method for Multi-terminal Hybrid HVDC Systems Considering Control Characteristics of Converter Station

作　　者：李海锋[1] 许灿雄 梁远升[1] 黄炟超 王钢[1] LI Haifeng;XU Canxiong;LIANG Yuansheng;HUANG Dachao;WANG Gang(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,Guangdong Province,China;Maintenance and Test Center of CSG EHV Power Transmission Company of China Southern Power Grid Co.,Ltd.,Guangzhou 510663,Guangdong Province,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]中国南方电网超高压输电公司检修试验中心,广东省广州市510633

出　　处：《中国电机工程学报》2023年第4期1426-1437,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52077082);广东省重点领域研发计划项目(2021B0101230001)。

摘　　要：精确的故障暂态计算是多端混合直流输电系统参数设计及其控制保护策略研究的基础。为此,该文计及不同换流站的控制特性,提出一种适用于多端混合直流输电系统的故障暂态解析计算方法。首先,分别构造考虑LCC整流站和MMC逆变站控制系统的复频域等值模型,建立计及直流架空线路频变特性的分布参数模型,推导多端混合直流系统的节点阻抗矩阵。在此基础上,计算故障节点电压和故障支路电流的复频域值,再利用拉氏反变换获得电压和电流的时域值。最后,基于PSCAD/EMTDC电磁暂态仿真软件搭建三端混合直流输电系统模型,对所提故障计算方法的准确性和快速性进行仿真验证。For multi-terminal hybrid HVDC systems,accurate fault transient calculation is the basis for the parameter design and the control and protection strategy research. In this paper, a fault transient calculation method considering the control characteristics of different converter stations for multi-terminal hybrid HVDC systems is proposed. First, the equivalent model considering the control systems of LCC rectifier station and MMC inverter station is built in complex frequency domain. Then, the distributed parameter model of DC overhead lines considering the frequency-dependent characteristics is established, and the nodal impedance matrix of multi-terminal hybrid HVDC system is derived. On this basis, the fault nodal voltages and fault branch currents are calculated in complex frequency domain. To transfer the calculations to the time domain, the inverse Laplace transform is adopted. Finally, the proposed method can be verified by comparisons with PSCAD/EMTDC simulation. And the results show that the proposed method has advantages of accuracy and high efficiency in fault calculation of the DC side.

关 键 词：多端混合直流输电 故障暂态计算 控制特性 节点阻抗矩阵 拉氏反变换 

分 类 号：TM71[电气工程—电力系统及自动化]