Symmetry method for obtaining mlutiterminal direct current power network nonlinear active power flow

Abstract

The invention relates to a symmetry method for obtaining multitermianl direct current power network nonlinear active power flow. First a symmetric nonlinear indeterminate equation system (S1) of node injected active power with respect to node voltage offset is buit, then a symmetric linear linear indeterminate equation system (S2) of a node injected active power increment with respect to a node voltage offset increment is built according to the symmetric nonlinear indeterminate equation system, node voltage offset of each node and the total quantity of node voltage (S3) in the multiterminal durect current power network are obtained according to the symmetric linear indeterminate equation system and known node injected active power, and finally nonlinear active power flow (S4) of each branch in the multiterminal durect current power network is obtained according to the node voltage offset of each node in the multierminal direct current power network, whrein the node voltage offset of all nodes in the multiterminal direct current power network is equally treated, the obtained all node voltage offset always draws close to zero, a reference node does not need to be selected, and obtained nonlinear active power flow is uniqud and reasonable.

Description

technical field [0001] The invention belongs to the field of electric power engineering, and in particular relates to a symmetrical method for obtaining the nonlinear active power flow of a multi-terminal DC power network. Background technique [0002] Currently, multi-terminal DC power grids are booming with the development of renewable energy generation. This kind of power network is inseparable from the nonlinear active power flow in both the planning and operation stages. The acquisition method of the nonlinear active power flow is an important tool to ensure the efficient planning and operation of the multi-terminal DC power network. [0003] The existing method for obtaining nonlinear active power flow in a multi-terminal DC power network needs to manually select a node in the multi-terminal DC power network and specify its voltage. This node is called a reference node. Differences in the preferences of different personnel will cause them to choose different reference...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a symmetrical method for obtaining the nonlinear active power flow of the multi-terminal DC power network, aiming at solving the asymmetry of the acquisition method and the non-unique acquisition result existing in the existing methods for obtaining the nonlinear active power flow of the multi-terminal DC power network Unreasonable and unreasonable and the need to repeatedly calculate the nonlinear active power flow

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