Fixed Change-Rate Matrix Correction Algorithm for Processing PV Nodes in Active Distribution Network Power Flow Calculation

Aiming at the traditional forward-backward method not processing PV nodes of active distribution network power flow calculation, a correction algorithm based on a fixed change-rate matrix is proposed. The change-rate matrix is used to solve the reactive power compensations of PV nodes, thereby indirectly transforming PV nodes into PQ nodes. The derivation and solution of the fixed change-rate matrix are studied. Theory proves that there are linear relationships between the voltage corrections and the reactive compensations of PV nodes. The elements of the change-rate matrix are constant and are not related to values of the reactive compensation. The muliple power flow calculation method is used to solve the fixed change-rate matrix, which overcomes the error caused by the direct calculation of transfer reactance, thus improving the convergence of the algorithm. The proposed algorithm is validated by the IEEE 33-node system with PV-type DGs. The simulation results show that the proposed algorithm has good convergence, and the convergence of the algorithm is weakly sensitive to the number and the initial reactive power values of PV-type DGs.