中文摘要：

建立电力系统暂态电压安全分析的微分代数方程组模型,并提出求解其预防控制优化问题的暂态电压安全约束最优潮流模型。在该模型中,暂态电压安全约束包括防止系统发生暂态电压失稳和暂态电压延时恢复2个方面;目标函数为系统运行费用最小;控制变量为发电机的有功输出、无功输出、有载调压变压器变比和并联电容器组投入电纳。基于轨迹灵敏度法,得到暂态电压安全约束函数与控制变量之间的近似线性增量关系,从而将优化控制模型转化为非线性规划模型。引入二次罚函数处理变压器变比和并联电容器组电纳等离散控制变量,并采用非线性原对偶内点法求得优化模型的解。对IEEE39节点系统的分析计算验证了所提出的优化模型和算法的正确性和有效性。

英文摘要：

The differential and algebraic equations based power system model is established for analyzing power system transient voltage security problem first;and the transient voltage security constrained optimal power flow model is then presented to solve the preventive control optimization problem. In this model,Transient voltage security constrains include two aspects of avoiding transient voltage instability and transient delayed voltage recovery. The objective function is the operation cost of the systems,and the control variables include active power output,reactive power output of generators,ratio of on-load tap changing transformers,and switching susceptance of shunt capacitors. Based on the trajectory sensitivity method,the approximate linear relationship between transient voltage security constrained functions and control variables is found,and then the optimisation model is transformed to static nonlinear programming model. The nonlinear primal-dual interior-point algorithm is used to get the solution of the optimisation model,which incorporates a quadratic penalty function to deal with discrete control variables of transformer ratio and shunt capacitor switching susceptance in the optimization process. Case studies using the IEEE 39-bus system validate the proposed optimisation model and algorithm.