Symmetric obtaining method for coefficient of active power transmission from nodes to branches in power network

Abstract

The invention belongs to the field of electric power engineering, and provides a symmetric obtaining method for a coefficient of active power transmission from nodes to branches in a power network. According to the method, a linear function relationship between branch active power and node voltage phase angles is established according to known alternating current power network parameters and alternating current power network running characteristics, a symmetric linear function relationship between the node voltage phase angles and node injected active power is established according to the linear function relationship and the node injected active power, a symmetric linear function relationship between the branch active power and the node injected active power is established according to the linear function relationship and the known symmetric linear function relationship, and the coefficient of the active power transmission from the nodes to the branches is obtained according to the symmetric linear function relationship and the function relationship between the branch active power and the coefficient of the active power transmission from the nodes to the branches. The problems that existing obtaining methods for the coefficient of the active power transmission from the nodes to the branches go against a physical symmetry rule and a circuital law, and cannot reflect the characteristics of the active power transmission from the nodes to the branches truly are solved.

Description

technical field [0001] The invention belongs to the field of electric power engineering, and in particular relates to a symmetrical acquisition method of the active power transmission coefficient from a node to a branch in a power network. Background technique [0002] At present, the power network needs to obtain the active power transmission coefficient from the node to the branch to efficiently formulate the power network planning scheme, efficiently regulate the safe state and stable state of the power network operation, and ensure the safe, reliable and economical operation of the power network. [0003] The existing method for obtaining the active power transfer coefficient from node to branch is based on the DC power flow equations of the reference node. In this method, in order to ensure that the DC power flow equations are solvable or that the coefficient matrix is ​​invertible, it is necessary to delete the active power balance equations of the reference nodes from...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a symmetrical acquisition method of the active power transfer coefficient from the node to the branch in the power network, aiming to solve the violation of the physical symmetry law and the Circuit law, and can not truly reflect the problem of active power transfer characteristics from node to branch

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