变压器支路处理新方法与配电网三相潮流计算

A Novel Method for Transformer Branch Processing and Three-phase Power Flow Calculation in Distribution Networks

针对配电网中处理变压器支路繁琐、工作量大等问题,提出了一种新的变压器支路处理方法,并可方便地引入配电网三相潮流算法中。该方法根据变压器两侧序状态量的相移关系,建立相位变换矩阵,简化了变压器支路的处理,利用不对称线路三序解耦—补偿模型和配电网三序解耦特点,基于回路分析法生成各序网道路矩阵,建立节点序电压与注入序电流之间的关联公式,从而实现了含多变压器支路的不平衡配电网三相解耦潮流计算。算法中的三序解耦及并行计算降低了计算规模,提高了计算速度和效率,节省了存储空间。最后,通过测试算例验证了该方法的正确性和有效性。

Transformer branches have been difficult to handle in three phase distribution power flow calculations.A novel method of processing transformer branches is proposed.It can be efficiently introduced into three-phase power flow algorithm for distribution networks.In the proposed method,according to the phase shift relations of the sequence state variables between the two sides of transformers,the phase transformation matrix can be established and the processing of transformer branches can be simplified.Using the structures of three-sequence decoupled distribution networks and the three-sequence decoupling-compensation models of unsymmetrical branches,the sequence path matrices can be generated with the loop analysis method.The relationship between node sequence voltage and injection sequence current can be derived.The three-phase decoupled power flow calculation for unbalanced distribution network containing multi-transformer branches can be realized successfully.Parallel computation can be used for the three-sequence decoupled power flow calculation to achieve higher computational efficiency.Finally,the simulation results of test examples are provided to demonstrate the correctness and effectiveness of the proposed method.