计及主变上层油温约束的受端电网的最小切负荷量优化方法

A minimization optimization method of cutting load in receiving power system considering linear constraints of top oil temperature of transformers

提出一种计及主变上层油温约束的受端电网的最小切负荷量优化方法。首先在主变上层油温与主变负荷之间的关系曲线基础上,对其进行了线性等效,建立了主变上层油温线性约束。随后,提出了计及主变上层油温约束的受端电网的最小切负荷量优化模型。该模型以220 k V站所带的110 k V线路开关的0-1状态和220 k V主变负荷的削减量为优化变量,建立了全网切负荷总量最小的目标函数,约束条件包含有功功率平衡约束、110 k V电网辐射型结构约束,并引入上述主变上层油温的线性约束,最终形成所建模型。由于该模型是一个二次整数规划问题,采用CPLEX工具箱对其进行了求解。最后,通过某实际220 k V/110 k V大型受端电网进行了仿真分析,验证了所建模型的有效性。

This paper proposes a minimization optimization method of cutting load in receiving power system considering linearized constraints of top oil temperature of transformers. First, based on relation curve between the transformer oil temperature and loads, the linearized constraint of transformer oil temperature is established. And then, a minimization optimization model of cutting load in receiving power system considering linear constraints of upper oil temperature of transformers is proposed. This model contains optimization variables of 110 kV breaker＇s 0-1 states and cutting loads of 220 k V transformers. The objective functions are the minimization of cutting load in receiving power system, and the constraints include the real power balance equations, the radial 110 kV power grid equation, as well as the above-mentioned linearized constraints of oil temperature of transformers, and the new model is formed eventually. Because this model is a mixed integer quartic programming problem, CPLEX tools are used for solving it. Finally, a large 220 k V/110 k V receiving power system is simulated and analyzed, verifying that the proposed model is effective.