变电站三绕组变压器阻抗值优化设计方法

The Impedance Optimization Method of Three-Winding Transformer for Substation Design

文章通过考虑变电站三绕组变压器不同电压等级侧的短路电流约束、变压器生产制造约束,以变电站无功补偿设备单组容量最大为目标函数建立优化模型,并采用广义既约梯度(GRG)算法求解该非线性规划问题。结合江苏电网实际工程设计,变电站无功补偿设备的单组容量可从6 Mvar提高至8 Mvar,大幅节省变电站占地面积及一次性建设投资,优化效果明显,具有重大工程应用意义。

In this research, one optimized model was built to solve the problem of impedance design, considering the short-circuit constraint and the manufacturing condition constraint, and the optimizing goal is to maximize the capacity of the single reactive-power compensation. The Generalized Reduced Gradient Algorithm is adopted to solve the proposed non-linear programming problem. The proposed method was applied on the design of substation in Jiangsu power system, and the result shows the beneft of the optimization method. With the method applied, the capacity of single reactive-power compensation can be increased from 6Mvar to 8Mvar, which makes the floor area and the cost of the substation much decreased. The practice application verifes the optimizing efect of the proposed method, and shows the deep signifcance in engineering application.