基于零注入启动法的配电网潮流状态估计

Power flow state estimation of distribution network based on zero injection start method

传统配电网潮流状态估计方法受到各支路网络影响,导致估计结果不精准。基于此,提出基于零注入启动法的配电网潮流状态估计方法。设置迭代数值,根据不同节点对配电网电压和电流复向量分组,得到分解节点电压相量,获得各个分解节点电压幅值。将大地视为零电位参考点,结合零注入启动原理得到电压相量,计算支路网络、支路等效电路及支路等值网络中的负荷阻抗,得到节点导纳矩阵。通过k次迭代处理后,可得到潮流收敛性计算结果,完成潮流状态估计。实验结果表明,该方法对配电网病态潮流适应性较强,且对于一般负荷、最小负荷和最大负荷电压估计结果较为精准。

The traditional power flow state estimation method is affected by each branch network,resulting in inaccurate estimation results.Based on this,a method of power flow state estimation based on zero injection starting method is proposed.Set the iterative value,group the complex vectors of voltage and current of distribution network according to different nodes,get the voltage phasor of decomposition nodes,and get the voltage amplitude of each decomposition node.The earth is regarded as the zero potential reference point,and the voltage phasor is obtained by combining the zero injection starting principle.The load impedance of the branch network,the equivalent circuit of the branch and the equivalent network of the branch is calculated,and the node admittance matrix is obtained.After k iterations,the results of power flow convergence can be obtained and the power flow state estimation can be completed.The experimental results show that this method has strong adaptability to the ill conditioned power flow of distribution network,and it is more accurate for the estimation results of general load,minimum load and maximum load voltage.