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

作者：Li Haifeng; Xu Canxiong; Liang Yuansheng^*; Huang Dachao; Wang Gang

来源：Proceedings of the CSEE, 2023, 43(4): 1426-1437.

DOI：10.13334/j.0258-8013.pcsee.212951

• control characteristics
• fault transient calculation
• inverse Laplace transform
• multi-terminal hybrid HVDC
• nodal impedance matrix

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. ?2023 Chin.Soc.for Elec.Eng.

• 单位
  南方电网科学研究院有限责任公司; test; 华南理工大学