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《工程(英文)》 >> 2022年 第19卷 第12期 doi: 10.1016/j.eng.2022.04.017

大规模新能源发电经直流送出的技术挑战与思考

State Key Laboratory of the Operation and Control of Renewable Energy and Storage Systems, China Electric Power Research Institute, Beijing 100192, China

收稿日期: 2021-12-30 修回日期: 2022-03-30 录用日期: 2022-04-25 发布日期: 2022-06-26

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摘要

新能源发电经直流送出成为碳达峰、碳中和战略背景下新能源大基地、规模化开发利用的主导形式之一。在高压直流输电送端已初步形成高比例新能源、高比例电力电子的局部双高电力系统。与以同步发电机为主导的传统电力系统相比,系统运行特性发生了深刻变化,逐渐出现宽频振荡和暂态过电压等新型稳定问题,导致大规模新能源脱网事故频发,传统电力系统的分析方法和设计原则面临挑战。本文针对双高电力系统的特性认知、作用机理、分析方法、研究手段、工程应用开展研究,明确宽频振荡和暂态过电压产生机理,提出小信号阻抗分析方法和电磁暂态仿真研究手段相结合的技术路线,研究成果已在我国华北、西北和东北地区新能源基地经直流送出重大工程中得到验证。最后,针对未来建设以新能源为主体的新型电力系统给出思考与建议。

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