珠三角电网目标网架研究

Research on Target Framework of Pearl River Delta Power Grids

珠三角电网具有负荷密度高、多直流馈入及网架结构复杂特征,存在短路电流超标、交直流交互影响严重、风险控制能力不足等问题。为此,提出以分区互联形态构建珠三角电网目标网架,具体构建了500 kV交流弱联系、1 000 kV特高压交流和异步互联3类方案,仿真分析了分区规模、联络形式等因素对珠三角电网安全性能的影响。结果表明,异步互联方案在故障隔离、提升系统可控性方面具有优势。

Pearl River Delta power grids have characteristics of high load density, multi-DC feed-in and complicated frame-work structure, and there are problems such as excessive short-circuit current, AC/DC interaction, insufficient risk control ability, and so on. Therefore, the paper proposes to construct the target framework of Pearl River Delta power grids by tak-ing a form of partition interconnection. Specific construction of the target framework includes 500 kV AC weak connection, 1 DO kV ultra-high voltage AC and asynchronous interconnection. It also analyzes influence of partition scale and connec-tion types on safety performance of Pearl River Delta power grids by simulating and results indicate asynchronous intercon-nection has advantage in fault isolation and promoting controllability of the system.