大直流弱送端系统安全稳定控制策略

Research on Security and Stability Control Strategy for Weak Sending-End System of Large Capacity HVDC Power Transmission System

呼辽直流作为呼盟火电基地直流外送通道,与呼盟交流外送通道并列运行,送端交流系统相对薄弱,属于典型的大直流弱送端系统,并且在特定条件下可能转入直流孤岛运行模式。根据呼辽直流的运行特点,针对呼辽直流在交直流并联运行、联网转孤岛、孤岛运行模式3种情况下分别存在的问题及其要的控制措施展研究,分析并提出了各种运行模式下发生故障后要采取的安全稳定控制策略。

As an HVDC power outward transmission channel for thermal power base located in Hulunbeir league, Inner Mongolia Autonomous Region, the HVDC power transmission line from Hulunbeir league to Liaoning province can be parallelly operated with HVAC power outward transmission channel located in Hulunbeir league, however the AC system at the sending end of the HVDC power transmission line is relatively weak, so it remains with typical weak sending-end system of large capacity HVDC power transmission system and under particular situation it is possible for this system to be turned into isolated operating mode. According to operational characteristics of the HVDC power transmission line, problems respectively existed under three operating conditions of the HVDC power transmission line, namely the parallel operating mode of HVDC power transmission with HVAC power transmission, turning from grid-connected operating mode into isolated operating mode and isolated operating mode, as well as the needed control measures are researched, and security and stability control strategies to be adopted after the occurrence of faults under above-mentioned three operating conditions are proposed and analyzed.