Abstract
In order to compute and analyze power flow of a distribution network with distributed generations(DGs) and eliminate various problems caused by placing of the DGs, several improved Newton methods were proposed successively, and initial value choice is one of the non negligible issues. The traditional initial value choice method also cannot ensure convergence under some circum stances, and the convergence problem is aggravated by the placing of the DGs. For the convergence problem in the computation for the distribution network with vast DGs accessed by the Newton method, this article proposes an approximation algorithm based on series expansion for computing voltage approximation as the computed initial value of power flow so as to improve algorithm convergence. Furthermore, effects of the number of the DGs, node types, their locations, etc. on error between the voltage approximation and the exact voltage value are analyzed through examples. Example verification shows that the error between the voltage approximation computed by the method described in this article and the obtained final value through calculation is small, and replacing the traditional initial value with the voltage approximation can effectively improve convergence of the power flow computation and reduce iterations.
Published Version
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