提升金沙江二期特高压直流外输电举措

Measures for Improving UHVDC Delivery Output in Second Phase of Jinsha Ｒiver Project

摘要:

为实现金沙江下游白鹤滩水电站电能东送区外电网负荷中心，国网“十四五”期规划建设金沙江二期 2 回 ± 800 kV 特高压直流输电工程。根据白鹤滩水电站水电出力特性、“十四五”期四川电网大量富余清洁电能可供外送 的电力发展状况，结合金沙江二期 2 回特高压直流输电工程本身的特点与优势等，提出了提升金沙江二期特高压直流 外输电的电力举措: 丰水期白鹤滩水电站参与四川电网调峰运行，金沙江二期特高压直流输电平台全年差异化接收四 川电网部分富余清洁能源( 丰水期季节性水电与平枯期新能源电量) ，研究表明: 所提电力举措，2025 年丰水期可实现减 少四川电网弃水约 5000 GW·h，同时亦可增加金沙江二期 2 回 ± 800 kV 特高压直流输电线路年利用小时数约 470 h 。

Abstract:

Double － circuit ± 800 kV UHVDC transmission project in the second phase of Jinsha Ｒiver project of State Grid are planned and constructed in the year of 2021 ～ 2025． According to the hydrologic output characteristics of Baihetan hydropower station and the substantial surplus of Sichuan green clear energy in the year of 2021 ～ 2025，and combined with the characteristics and advantages of double － circuit ± 800 kV UHVDC transmission project in the second phase of Jinsha Ｒiver project， the measures for improving UHVDC delivery output in the second phase of Jinsha Ｒiver project are proposed． The research results show that: by taking the measures，the quantity of abandoning energy in high flow period of Sichuan power grid can be decreased about 5000 GW·h and the annual utilization hours of double － circuit ± 800 kV UHVDC transmission lines in the second phase of Jinsha Ｒiver project can be increased about 470 hours．