Fast Power Flow Calculation of Three-Phase Unbalanced Low-Voltage Distribution Network Considering Distributed Photovoltaic
With the continuous promotion of the"Carbon Peak and Carbon Neutral"strategy,the construction of distributed photovoltaic access distribution network project is also developing rapidly.In order to meet the needs of a large number of distributed photovoltaic con-nected power grid,a fast power flow algorithm for three-phase unbalanced low-voltage distribution network considering distributed photo-voltaic is proposed.Firstly,the component model of distribution network including distributed photovoltaic is established.Secondly,upper triangular impedance matrix with power flow direction and topological parameters is proposed,which is a sparse matrix,and which improves the speed of power flow calculation.Thirdly,in order to analyze the neutral point displacement of low-voltage distribution network caused by the imbalance of three-phase topology or load(distributed photovoltaic as a negative load),the voltage of the far-end node of the neutral line is approximately calculated,so that the node is equivalent to the three-phase current concentrated loop node.Fourthly,algorithm flow of fast power flow calculation is proposed.Finally,the ultra-realtime characteristics and accuracy of the algorithm are verified by an im-proved IEEE 33 node example,which provides a strong support for large-scale distributed photovoltaic access.
low voltage distribution networkthree phase unbalancedistributed photovoltaicpower flow calculationneutral point dis-placement
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