极坐标系下主动配电网三相线性潮流计算方法

Three-phase linear flow calculation method for active distribution network in polar coordinate system

线性潮流计算方法可以提高主动配电网集中优化控制的鲁棒性和快速性。随着分布式电源在主动配电网中的广泛接入,配电网中的电压控制节点逐步增多,以保持正常的电压水平。现有直角坐标系下三相线性潮流无法处理本地压控节点,现有极坐标下的线性潮流模型未能详尽考虑分布式电源控制特性、网损分摊特性与配电网三相特点。因此提出三相极坐标系下的线性潮流计算方法来解决这个问题。所提方法考虑了Y或Delta型连接ZIP负荷、单相或三相分布式电源(Distributed Generators, DGs)等类型。同时考虑了DGs的详细控制模型和分布式松弛母线模型。最后通过三相不平衡的IEEE 13,34,37和123节点系统验证所提方法的精度和对各种节点类型的适应性。

The linear power flow calculation method can improve the robustness and rapidity of the centralized optimization control of active distribution network.With the wide access of distributed generation in active distribution network,voltage control nodes in distribution network gradually increase to maintain normal voltage level.Existing three-phase linear power flow under a rectangular coordinate system cannot cope with local voltage control nodes,the existing linear power flow model under the polar coordinate system failed to consider detailed control characteristics of DGs,network loss allocation and three-phase characteristics of distribution network.Therefore,this paper proposes a linear power flow calculation method in the three-phase polar coordinate system to solve the problem.The proposed method considers the types of Y-connection ZIP load,Delta-connection ZIP load and single-phase or three-phase Distributed Generators(DGs),etc.DGs detailed control model and distributed slack bus model are also considered.Finally,the proposed method’s accuracy and adaptability of various node types are verified by the three-phase unbalanced IEEE 13,34,37 and 123 nodes system.