With the high proportion of new energy access,the three-phase imbalance problem of power grid is becoming more and more prominent,and it is urgent to analyze the three-phase power flow algorithm suitable for engineering.The traditional three-phase power flow algorithm has problems such as strong initial value dependence,complex model,low computational efficiency and limited applicable scenarios.The holomorphic embedding method is a new analytical method for solving nonlinear power flow equations,which has the advantages of independent of initial values and constant matrix in the solution process.Therefore,based on the characteristics of the three-phase element model of the power grid,this paper first uses the phase sequence transformation matrix to construct the holomorphic embedding model of the three-phase power flow.Secondly,based on the principle of equal power series coefficients,the recursive relationship of model coefficients is derived,and the matrix paradigm technique is used to simplify the calculation model.Thirdly,the zero-sequence constraint equation is reconstructed analytically,and the matrix row-column replacement technology is used to realize the efficient solution of three-phase power flow under different grounding modes.Finally,the proposed method has been verified on IEEE 33,modified IEEE 123 and a regional power grid system in China,demonstrating its the advantages of high efficiency,reliable convergence and independence from the initial value of calculation.
关键词
三相潮流/全纯嵌入法/通用算法/矩阵范型/接地方式
Key words
three-phase power flow/holomorphic embedding method/general algorithm/matrix paradigm/grounding method
维普
万方数据