辐射状配电网支路电流法潮流计算的收敛特性研究

对支路电流法收敛机理进行了理论分析，阐述了该方法在辐射状配网潮流计算时具有线性收敛的特性，指出支路电流法收敛特性与线路的尺／义无关，其收敛条件在一般的配电系统中都能够得到满足。对配网潮流支路电流法在给定收敛精度和恒定阻抗负荷条件下达到收敛时所需的迭代次数进行了深入研究，得到配网潮流支路电流法用于2节点系统时迭代次数的估算公式。在此基础上给出了多节点配电系统潮流计算迭代次数的估算公式，给出的算例验证了得出的估算公式是可行的。

RESEARCH ON CONVERGENCY OF BRANCH CURRENT METHOD BASED POWER FLOW CALCULATION FOR RADIAL DISTRIBUTION NETWORK

Theoretical research on the convergency mechanism for branch current method based power flow calculation is performed and it is expounded that this method is linear convergent in the power flow calculation for radial distribution network. The research results show that for ordinary distribution networks the convergent feature of branch current method does not depend on the ratio of R to X and its convergent condition can be satisfied. For the power flow calculation for distribution network which is performed under the condition of specified convergence accuracy and the load with constant impedance, the detailed research on the iteration times at which the convergence appears is carried out, and the formula to estimate the iteration times is obtained while branch current method is applied to the power flow calculation of a 2-node system. On this basis, an estimation formula of the iteration times for the power flow calculation of distribution network with multi-nodes is put forward. The feasibility of the proposed estimation formula is verified by given calculation examples.