Node disturbance power transfer distribution balance degree analyzing method

Abstract

The invention discloses a node disturbance power transfer distribution balance degree analyzing method. The method comprises the steps of conducting load flow calculation on an electric system when the electric system operates and obtaining a sensitivity matrix of branch power to node injection power, obtaining a load flow transfer rate matrix according to the sensitivity matrix and the active power margin of a branch, obtaining the probability distribution condition of each element in a column vector corresponding to each node in the load flow transfer rate matrix in a load flow transfer rate statistical interval, calculating the improved information entropy according to the probability distribution condition to serve as the index for reflecting each node disturbance power transfer distribution balance degree, and conducting safety assessment on the system under the disturbance of each node according to the transfer distribution balance degree indexes. The method is used for quick assessment of the node injection power anti-interference capacity of the large-scale electric system, computing speed and accuracy can meet the requirements for online safety assessment of the large-scale electric system, and guidance can be provided for load management of the electric system and error control of a grid-connected wind power unit.

Description

technical field [0001] The invention belongs to the field of power system steady-state analysis, and relates to a method for analyzing the distribution balance degree of node disturbance power transfer. Background technique [0002] The interconnection, dynamics, nonlinearity, randomness and real-time characteristics of modern large-scale power systems have brought great difficulties to power system security analysis and put forward higher requirements. With the rapid growth of load and its diversification, and the access of intermittent energy sources, the large-scale power system under the interactive environment of "source-grid-load" is facing more uncertain factors. These uncertain factors will cause the transfer of the power flow of the system, which may lead to the system exceeding the limit and so on. Therefore, it is necessary to study the impact of the disturbance of node injected power in the power system on system security, and then provide guidance for power sys...

AI Technical Summary

Problems solved by technology

Power flow balance analysis is an effective method for power grid steady-state analysis. When the power flow distribution balance of the system is poor, it is easy to exceed the limit and other situations. In serious cases, it is more likely to cause large-scale cascading failures, which will bring adverse consequences to the safe operation of the power system.

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