Modified direct-current power flow algorithm suitable for online analysis of distribution network

Abstract

The invention discloses a modified direct-current power flow algorithm suitable for online analysis of a distribution network and belongs to the field of power flow analysis for power systems. The algorithm is applicable to the fields such as online analysis of the distribution network and real-time optimal control. The algorithm includes solving active and reactive power flows of branches of the distributed network by forward sweeping of node injection powder from the tail end of the distribution network to a root node; solving voltage phase angles of nodes of the distributed network by back substitution from the root node of the distributed network to a distribution terminal; acquiring linear equations of node voltage amplitudes and node injection powers by omitting deviation second-order terms of node voltage amplitudes of the distributed network, and solving the linear equations to obtain node voltage amplitudes. The algorithm has the advantages that the advantages of the standard direct-current power flow method are retained, no hypothesis is made to line parameters, the algorithm is suitable for radial power grids of any parameters, both the node voltage amplitudes and the node voltage phase angles can be computed, and the solving precision and the value stability are greatly improved as compared with those acquired by the standard direct-current power flow algorithm.

Description

technical field [0001] The invention relates to the field of power system power flow analysis, in particular to an improved DC power flow algorithm suitable for on-line analysis of distribution networks Background technique [0002] Due to the intermittent and random nature of renewable energy, its massive access will have a wide impact on the distribution network, mainly in: changing the voltage level of the distribution network, improving the short-circuit capacity of the distribution network, and relay protection strategies The complexity of the network is increased, the reliability of the power supply of the network is affected, and the deterioration of the power quality is exacerbated. In response to this situation, the C6.11 project team of the 2008 International Conference on Large Power Grids (CIGRE) Power Distribution and Distributed Generation Special Committee (C6) proposed that the future distribution network should be able to use flexible network topologies to s...

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Problems solved by technology

[0004] In order to overcome the problems that the existing standard DC power flow algorithm has low calculation accuracy and cannot be directly used for distribution network power flow analysis, the present invention proposes an improved DC power flow algorithm that can be applied to online power flow analysis for radial distribution networks

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