Robust state estimation method based on interior point method for electrical power system

Abstract

The invention relates to a robust state estimation method based on an interior point method for an electrical power system, which belongs to the technical field of electrical power system operation and control. The method comprises the following steps: obtaining measurement data, performing topology analysis, and calculating power grid parameters; establishing an exponential function robust state estimation model; introducing a residual variable, and performing an equivalent transformation on the robust state estimation model, so as to specify the robust state estimation model to be in a form which is easy to solve by the interior point method; and solving the state estimation model after the equivalent transformation by virtue of the interior point method, and performing numerical approximation on a Hessian matrix. According to the method disclosed by the invention, due to the equivalent transformation for the state estimation model, the difficulty of robust state estimation for the electric power system is reduced; due to approximation for the Hessian matrix, the calculation efficiency of the robust state estimation for the electric power system is greatly increased; a state estimation result strictly meets a zero-injection equality constraint; and the calculation method is great in robustness.

Description

technical field [0001] The invention relates to a method for estimating a robust state of a power system based on an interior point method, and belongs to the technical field of power system operation and control. Background technique [0002] The state estimation of the power system is to use the real-time measurement collected by the data acquisition and monitoring control system as the data input source, after eliminating the bad data, combined with the power grid model, according to a specific state estimation model, the state quantity of the power grid is optimally estimated . State estimation plays an extremely important role in energy management systems and is an important cornerstone of a series of advanced applications. [0003] Traditional power system state estimation requires the identification and elimination of bad data in order to make accurate estimates. But now it is hoped that the estimation bias caused by bad data can be automatically reduced in the proc...

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Problems solved by technology

[0005] The purpose of this invention is to propose a robust state estimation method for power systems based on the interior point method, and apply the modern interior point method to the robust state estimation to solve the problem of narrow convergence domain of state estimation in actual engineering

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