Method for acquiring a transmission coefficient of a source-load equivariant symmetrical power in an AC main.

Abstract

The present invention belongs to the field of electric power engineering, and relates to a method for acquiring a transmission coefficient of a source-load equivariant symmetrical power in an AC main. An linear functional relationship of a transmission power of a lossy branch related to a node voltage phase is established according to a nonlinear function of a transmission power of a branch, parameters of the AC main and operating characteristics, and a symmetrical linear functional relationship of node power of a power source and a load related to the node voltage phase is established by the combination of the node power of the power source and the load, hereby, a symmetrical linear functional relationship of the node voltage phase related to the node power of the power source and the load is established, and a symmetrical power transmission coefficient of the node power of the power source and the load to the transmission power of the lossy branch is acquired by the combination of the linear functional relationship when the node power of the power soure and the load in an equivariant state, thereby, the substrantive characteristic is acquired, wherein, the substrantive characteristic has an only result, follows a circuit rule, adapts to the node power of the power source and the load in an equivariant state, and really represents the power transmission from the node power to the branch transmission power in the practical situation that a loss exists in the AC main.

Description

technical field [0001] The invention belongs to the field of electric power engineering, and in particular relates to a method for obtaining symmetrical power transmission coefficients of covariant source and load in an AC power network. Background technique [0002] At present, the AC power network not only needs to use the power transfer coefficient from the node power to the branch transmission power in the real-time operation of the normal state to ensure real-time economy, but also needs to use this coefficient in the control of the fault state to ensure the real-time performance of safe and stable control . Therefore, the power transfer coefficient from node power to branch transmission power is an important tool for the safe, stable and economical operation of AC power grids. [0003] The existing method for obtaining the power transfer coefficient from the node power to the branch transmission power in the AC power network is based on the node power balance equation...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for obtaining the symmetrical power transfer coefficient of the same variable source and load in the AC power network, aiming at solving the problems existing in the existing method for obtaining the power transfer coefficient from the node power to the branch transmission power in the AC power network The obtained results do not conform to the uniqueness principle in the circuit electromagnetic field theory, do not follow the circuit law, do not adapt to the actual situation where the node power of the power supply and load changes at the same time and the AC power network has losses, and cannot truly reflect the power transmission from the node power to the branch transmission power The question of the essential characteristics of

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