含分层接入特高压直流的交直流混联电网机电— 电磁暂态混合仿真研究

特高压直流分层接入系统在提升受端电网电压支撑的同时也带来了不同层间系统耦合关系复杂等问题。为准确研究特高压分层接入后交直流混联系统运行特性，结合±800 kV雅中—江西分层接入特高压直流输电工程，基于ADPSS搭建含特高压分层直流输电系统的交直流电网混合仿真模型。首先通过仿真对比验证了纯电磁暂态模型的正确性。然后对比分析关断角独立控制指令阶跃响应下混合仿真模型和纯电磁暂态模型的仿真结果，验证了混合仿真模型的准确性和优越性。最后与机电暂态模型进行故障仿真对比。仿真分析表明，混合仿真能够准确反映特高压直流分层接入后混联系统动态特性，提供很好的仿真模型基础。

Electromechanical-electromagnetic transient hybrid simulation of an AC/DC hybrid power grid with UHVDC hierarchical connection mode

UHVDC hierarchical connection to a system not only improves the voltage support of the receiving end grid but also brings problems such as the complex coupling relationship between different layers of the system. In order to study the operating characteristics of an AC/DC hybrid system with a UHVDC hierarchical connection, this paper examines the ±800 kV Yazhong-Jiangxi UHVDC transmission project. An AC/DC hybrid simulation model with UHVDC hierarchical connection mode is built based on ADPSS. First, the correctness of the electromagnetic transient model is verified. Then the accuracy and superiority of the hybrid simulation model are verified by comparing the simulation results under extinction angle step response of independent control command with the electromagnetic transient model. Finally, the fault simulation of the hybrid model is compared with the electromechanical transient model. Results show that hybrid simulation can accurately reflect the dynamic characteristics of a hybrid system and provide a simulation foundation model. This work is supported by National Natural Science Foundation of China (No. 51577075).