摘要
通过对500kV电网短路电流超标问题进行研究,考虑抑流效果与主网完整性、系统电压安全稳定性之间的关系,提出一种基于综合灵敏度分析限制短路电流的多目标决策线路开断优化方法。首先通过分析受端电网开断线路对超标站点自阻抗、三相短路电流及节点电压的灵敏度,建立了综合灵敏度多目标优化模型。再对灵敏度进行归一化处理,借助组合权重因子及帕雷托(Pareto)最优前沿集的定义,求得综合灵敏度值,对其降序排列得到以综合效果最佳为目标的断线措施优先级,进行短路电流校验,从而可快速地寻找到最优断线措施方案。通过对广东电网某500kV层简化网络仿真验证,结果表明了所提方法的有效性,该方法能够快速获取限流的最优断线决策方案。
This paper performed researches on excessive short-circuit current of 500 kV power grid, considering relationship among suppression effect, main network integrity and security and stability of system voltage, and proposed a multi-objective line-outage optimization method based on comprehensive sensitivity analysis to limit short-circuit current. Firstly, it analyzed sensitivities of breaking-lines to excessive site self-impedance, three-phase short-circuit current and node voltage at grid end, building a multi-objective optimization model of comprehensive sensitivity. Then getting sensitivity normalized, it obtained comprehensive sensitivity values by means of combining weighting factor and definition of Pareto optimal front set. Descending the values to get priority of measures of the best combined effect, optimal line-outage measure was quickly found after checking short-circuit current. Effectiveness of this method is verified with simulation results of a 500 kV simplified network in Guangdong power grid, and the method can quickly obtain optimal line-outage measure to limit short-circuit current.
出处
《电网技术》
EI
CSCD
北大核心
2016年第1期309-315,共7页
Power System Technology
