农村电网优化电压制式及经济供电半径的研究

Research on optimized voltage pattern and economic power supply radius of rural grid

随着中国农村电气化的发展,农网的用电负荷和用电量与日俱增,现行的电压制式已不能满足需求,如何选取更好的电压等级制式方案成为迫切需要解决的问题。该文在对电网结构模型进行合理设计的基础上,通过对电网经济参数、费用的计算,建立以单位供电面积年费用最小为目标函数,以电网各电压等级供电半径为优化变量的有约束非线性规划模型。应用该模型优化所得的目标值对不同电压等级制式方案进行经济比较,研究结果表明未来中国农网电压制式应简化电压等级,中压配电电压应发展到20kV及35kV,农网供电半径应根据经济供电半径的参考取值进行适时调整。

With the development of rural electrification,electricity load and consumption of rural power network are increasing.The current voltage pattern can not meet the demand,and how to select better voltage pattern programs become an urgent problem to be solved.Based on rational design of the network structure model,and through calculations of the economic parameters and the cost on the grid,a constrained nonlinear programming model was established,which the objective function is to minimize annual cost of unit power supply area and optimization variable is the power supply radius.Economic comparison between different voltage pattern programs were conducted using the objective value optimized by this model.The results show that voltage pattern of rural power network in our country should be simplified in the future,and medium distribution voltage should be developed to 20 kV and 35 kV,and power supply radius of rural power grid should be adjusted according to the reference values of economic power supply radius.