提升电网运行的交直流系统协调控制策略研究  

Study on AC/DC system coordinated control strategy for grid operation performance enhancement

作　　者：陈汉雄[1] 李婷 李奥 CHEN Hanxiong;LI Ting;LI Ao(POWER CHINA Sichuan Electric Power Engineering Co.,Ltd.,Chengdu 610016,China;State Grid Sichuan Economic Research Institute,Chengdu 610041,China)

机构地区：[1]四川电力设计咨询有限责任公司,四川成都610016 [2]国网四川省经济技术研究院,四川成都610041

出　　处：《电力系统保护与控制》2021年第10期123-134,共12页Power System Protection and Control

基　　金：国家电网公司科技项目资助(SGSCJY00GHJS1800026)。

摘　　要：四川西部电网建设有多回水电送出500 kV交流输电通道,大容量水电送出通道严重故障方式下电网交流系统可能出现一定的低频运行风险。为改善川西交流电网严重故障方式下系统全网暂稳水平及帮助恢复交流系统频率,提出了提升电网运行性能的交直流系统协调控制策略。该策略具体包括:4回±800 kV特高压直流输电系统利用直流功率调制功能与交流系统间实现协调控制;协调控制目标效果;不同故障点交直流协调控制模式的选择(分散/集中两种协调控制模式);直流调制功率释放转移至交流电网后,其对交流电网热稳安全与电网经济性运行的影响分析。所提特高压直流输电系统与交流电网间的协调控制策略,可作为帮助分析研究交直流混联系统电网运行状况与提升电网安全经济运行水平举措的技术参考。The hydropower which sends out corridors in the Sichuan west provincial grid consists of multi-circuit 500 kV AC transmission lines.The AC system of the Sichuan grid bears the low frequency operational risk when serious faults occur on large capacity AC system transmission corridors.To promote Sichuan grid transient stability and help to recover AC system frequency,a study is performed on the AC/DC system coordinated control strategy to improve Sichuan grid operation performance.The coordinated control strategy includes:4 circuit±800 kV UHVDC to obtain coordinated control with the AC system using a DC power modulation function.This provides the desired outcome of coordinated control,optional modes of coordinated control for different fault locations(distributed/centralized control modes),an analysis of the influence on AC grid heat stability security and grid operation economical efficiency when UHVDC DC modulation power transferred to the AC system.The AC/DC system coordinated control strategy introduced by this paper can help to analyze the AC/DC system operating condition of a AC/DC co-existent grid and be regarded as the technological measure reference for grid security and economical operation enhancement.

关 键 词：电力系统 低频 特高压直流输电 直流功率调制 交直流协调控制 

分 类 号：TM721.3[电气工程—电力系统及自动化]