特高压交直流接入对江西电网暂态稳定的影响分析

Transient stability impact analysis of UHV AC/DC access to Jiangxi power grid

雅中特高压直流及华中特高压交流环网接入江西电网后,电网特性发生根本性变化,暂态稳定约束成为江西电网运行及控制主要约束条件。深入研究交直流混联背景下江西电网暂态稳定水平及其影响因素具有现实指导意义。基于PSASP程序建立江西电网220 kV以上交流系统及±800 kV分层直流模型,仿真分析了直流系统典型故障、直流近区交流系统典型故障及交流环网对电网暂态稳定的影响。提出了提升暂态稳定水平的控制策略及应对措施,为特高压入赣后电网安全稳定运行奠定了基础。

Since the Yazhong UHVDC and Huazhong UHVAC ring networks are connected to Jiangxi power grid, power grid characteristics have changed completely. Transient stability constraints become the main reason of constraints for operation and control of Jiangxi power grid. Under the background of AC-DC hybrid, it has practical significance that studying deeply on the transient stability level and its influenced factors of Jiangxi power grid. Based on the PSASP program, this paper establishes a voltage level above 220 kV system and a ±800 kV layered DC model in Jiangxi power grid. It simulates and analyses typical faults in DC systems, typical faults in DC near-area AC systems, and effects of AC ring network on grids transient stability, presenting control strategies and countermeasures to improve the level of transient stability, which lays the foundation for safe and stable operation of UHV AC/DC access to Jiangxi power grid.