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为了研究特高压交流输变电工程的建设对华东电网安全稳定性的影响,结合多个与华东落点相关的特高压输变电工程,采用电力系统仿真软件BPA对特高压交流电网发生单一或复杂故障的情况进行计算,分析了特高压交流电网建成后华东电网的安全稳定水平。计算结果表明,当徐州-南京北双回线路发生异名相跨线故障时,电压逐渐滑落同时伴随功角逐步摆大,系统暂态失稳;对所提出的3种安全稳定控制方案进行比较后确定了推荐方案。进一步分析徐州-南京北双回线路N-2故障时失稳情况特殊性的内在机理,是随着华东电网分层分区的进行,在大量受入有功功率或缺乏无功电源支撑的地区可能因线路故障从而引发电压稳定问题。
In order to study the impact of the construction of UHV AC transmission and transformation project on the safety and stability of East China Power Grid, combined with a number of UHV power transmission and transformation projects related to East China’s point of deployment, the power system simulation software BPA is used to detect single- Complex fault conditions are calculated, the analysis of the UHV AC power grid after the completion of East China Power Grid security and stability. The results show that when the Xinyu-Nanjing North double-circuit line has an alien-phase over-line fault, the voltage gradually slips and the power angle gradually increases and the system transient instability occurs. The proposed three kinds of safety and stability control schemes are compared After determining the recommended program. Further analysis of the inherent mechanism of the instability of N-2 failure of Xuzhou-Nanjing North double-circuit line is due to the hierarchical division of East China Power Grid. Due to the large number of areas supported by active power or lack of reactive power source, Fault thus triggering voltage stability problems.