溪洛渡—浙西特高压直流投运后系统稳定特性及协调控制策略  

Stability Characteristics and Coordinated Control Strategy of Grid-Integrated UHVDC Transmission Line From Xiluodu to Zhexi

作　　者：吴萍[1] 张健[1] 屠竞哲[1] 卜广全[1] 陈昊[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2014年第7期1873-1878,共6页Power System Technology

摘　　要：溪洛渡—浙西特高压直流投运后,将与复龙—奉贤特高压直流形成我国届时最密集的特高压多直流送出系统。分析了多直流送出系统与交流电网的耦合特性,提出了多直流送端系统故障后送端交直流协调控制策略。多直流送出系统由于电气距离较近,故障后相互支援可靠性较高,且对送端区域电网潮流影响较小;但存在多个直流同时闭锁的风险,需要采取大量的控制措施。研究了溪浙直流投运后与受端交流电网相互影响规律,并对交流系统和直流系统重要参数进行敏感性分析。结果表明,优化参数能有效提升受端电网稳定性。After putting UHVDC power transmission line from Xiluodu to Zhexi into operation, together with the UHVDC power transmission line from Fulong to Fengxian a UHVDC transmission system, which will contains most dense UHVDC sending terminals in China, will be formed. The coupling characteristic between the UHVDC transmission system with multi-sending terminals and the AC power grid is analyzed and the AC/DC coordinated control strategy at the sending end after the fault occurred in the UHVDC transmission system with multi-sending terminals is proposed. In view of closer electric distances among different sending ends in the UHVDC transmission system, the post-fault reliability of mutual support is high, and the impact of the fault occurred in UHVDC system on the power flow in regional power grid at the sending end is not serious; however there may exist the risk that multi UHVDC terminals are simultaneously blocked, so it is necessary to adopt various control measures. After putting the UHVDC power transmission line from Xiluodu to Zhexi into operation, the influencing rule between the UHVDC line and the AC power grid at the receiving end is researched, and the sensitivity analysis on important parameters of the AC power grid and the UHVDC line is performed. Research results show that parameter optimization can enhance the stability of AC power grid at the receiving end effectively.

关 键 词：特高压直流多送出系统 耦合特性 稳态电压波动 协调控制 参数优化配置 

分 类 号：TM721[电气工程—电力系统及自动化]