一种计算电力系统电压稳定临界点新模型

摘要

对有载调压变压器模型进行修正,在有载可调变压器模型中引入虚拟节点,并通过该节点的电压来表示理想变压器对功率、电压的转换关系,建立了有载调压变压器的二次型模型,由此在直角坐标系中提出了新型电压稳定临界点非线性规划模型.该模型的二阶导数是常数,其海森矩阵是精确的常系数矩阵,在预测校正原对偶内点法迭代过程中只需要计算一次,不需每次迭代都进行更新,从而缩短了每次迭代的计算时间.基于标准IEEE14、30、118、300和模拟1338节点系统(S-1338)的5个测试系统进行了仿真计算.算例结果表明:所提模型的迭代次数和计算结果与常规模型一致,但计算速度却有较大提高.%A new voltage stability critical point nonlinear programming model in rectangular form is proposed. In this model, the load tap changing transformer branch is represented by an ideal transformer and its series impedance connected by a dummy node. Instead of the turn ratio of the load tap changing transformer, the voltages on the two sides of the ideal transformer are used to change the model to quadratic. The Hessian matrices in this model are constants and need to be calculated only once in the entire optimal process using the predictor-corrector primal dual interior point method, which greatly speed up the calculation. The simulation results from five test systems ranging from 14 to 1388 buses indicate that the proposed mode! Is accurate and faster than conventional model.