With the rapid development of the modern power system, the grid structure is becoming more and more complex. One single fault or disturbance can bring system a huge risk. The assessment only based on present power flow section cannot fulfill the requirement of the grid safety any more. In this paper, the riskmethod and optimization algorithm are combined together, and a multi-objective optimal model based on optimal power flow with the object function of fuel cost is set up in order to coordinate the safety and the fuel economy, in which the low voltage risk is taken into consideration. And the primal-dual interior point algorithm is applied to solve the multi-object nonlinear optimization problem. The power grid of a city in Henan Province is adopted to test the effect of the low voltage risk optimal control, and the voltage safety and the operation economy after the outage of the branch are analyzed. The test results proved the validty of the algorthm and the calculation efficiency.%随着现代电力系统的飞速发展与日趋复杂,一次故障或者扰动有可能给系统带来极大的风险.仅仅对当前潮流断面进行风险评估已无法满足安全性的要求.文中将风险理论与优化方法相结合,在以发电费用最小的最优潮流基础上,考虑对事故后低电压风险的优化控制,建立了一个多目标的优化模型,用以协调故障后系统运行的安全性与经济性;采用矢量化原对偶内点算法对该模型进行求解;选取河南某市电网作为算例,进行低电压风险优化控制的测试,分析了该电网故障后的电压安全性与运行经济性.算例测试结果与该电网运行情况相符,验证了算法的正确性与计算效率.
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