计及线路电阻随温度变化影响的电力系统最优潮流

摘要

Despite the overall consideration by the conventional optimal power flow(OPF)of the economy,safety and quality of power system,the OPF model is based only on the electric model to the neglect of the branch thermal model,which is a great deviation from the dispatch of an actual power system.On the basis of the theory of electric coordination and the relationship between resistance and temperature of the branch,a temperature-dependent OPF model with electro-thermal coupling is proposed.To further improve the efficiency of the algorithm,the electric model and thermal model are decoupled and then solved by the interior-point method.Finally,it is shown by the simulation results of IEEE 5-bus,Case 30-,2736-,and 3012-bus of MATPOWER and actual 1856-bus test systems that the proposed model and method are successful and correct.%传统最优潮流(OPF)虽然将电网的经济性、安全性和电能质量进行了很好的统一,但在其数学模型中,仅考虑了电网线路的电气模型,而忽略了实际情况下线路的电热耦合关系,因此采用传统 OPF 计算结果作为实际电网调度运行的参考有着较大的偏差。在电热协调理论的基础上,根据线路温度和线路电阻之间的电热联系,建立了考虑电热耦合关系的温度 OPF 模型。此外,为进一步提高算法的计算效率,对电、热模型进行解耦计算,然后基于内点法进行求解。最后,通过对IEEE 5节点系统,MATPOWER 中的 Case 30、Case 2736、Case 3012节点系统以及一个实际1856节点系统进行仿真测试,验证了该模型和算法的有效性与正确性。