Distribution network power flow calculation method based on forward and backward substitution method

Abstract

The invention discloses a distribution network power flow calculation method based on a forward and backward substitution method. According to the invention, calculation is performed segment by segment from a tail end to an initial end according to the load power by taking a feeder as a basic calculating unit and taking assumption voltage to be rated voltage, only the power loss of each component is calculated, node voltage is not calculated, the current and power loss of each branch are solved, initial end power is acquired according to the solved current and power loss, the voltage drop is calculated segment by segment from the initial end to the tail end according to the given initial end voltage and the solved initial end power, voltage of each node is solved, the process is repeated in the above manner until power deviation of each node meets a permissive condition. The distribution network power flow calculation method has the characteristics of simple programming, high calculation speed, good convergence and good numerical stability. The calculation method is an effective algorithm for distribution network power flow calculation, and has extremely high practicability.

Description

Technical field: [0001] The invention relates to the technical field of distribution network analysis, operation and control, and more specifically relates to a distribution network power flow calculation method. Background technique: [0002] Distribution network power flow calculation is an important basis for power grid economic operation and system analysis. The distribution network not only has a radial operation structure, but also has many branches, and there is basically no connection between the feeders, which is obviously different from the transmission network structure. The normal operation distribution network has a radial network structure, a large number of load nodes, and the line R / X is large and other characteristics, so traditional power flow calculation methods such as: Newton's method, PQ decomposition method, etc. are no longer applicable in distribution network power flow calculation. The distribution network power flow calculation problem is mathema...

AI Technical Summary

Problems solved by technology

Although some scholars have made some beneficial attempts to make the fast decoupling method continue to be applied in the distribution network, such as applying compensation technology to deal with lines with large R / X, these methods complicate the algorithm and lose the fast The original decoupling algorithm has the characteristics of small calculation amount and reliable convergence

At present, there is no good method that can meet the requirements of distribution network power flow calculation, so it is urgent to develop a power flow calculation method suitable for distribution network.

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