A State Estimation Method of Power System Based on Least Squares

Abstract

The invention discloses a method for estimating the state of a power system based on least squares, which relates to a power system, including: first, determining the identification parameter matrix as η (n) =(‑[Y LL ] ‑1 Y LG ‑[Y LL ] ‑1 ); Then, collect the power supply voltage phasor on the generator node, the load voltage on the load node and the current phasor; then, solve the identification parameter matrix η (n) The estimated value of is split from the matrix to be identified to obtain the charge and admittance matrix Y LG , the charge-to-charge admittance matrix Y LL , solve the charge-induced admittance matrix Y LG The rate of change of each term; finally, extract the charge development admittance matrix Y LG If the internal change rate of the fault item is greater than the preset value, it is determined that the first transmission line matching the fault item is the fault line. The invention eliminates the data in the preceding item, so that the amount of calculation processing is reduced, and the data that is far away from the current moment is eliminated, thereby effectively improving the estimation accuracy of the system and effectively identifying the fault route of the power system.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for estimating the state of a power system based on least squares. Background technique [0002] The power system is an electric energy production and consumption system composed of power plants, power transmission and transformation lines, power supply and distribution stations, and power consumption. Its function is to convert the primary energy in nature into electric energy through the power generation device, and then supply the electric energy to various users through power transmission, transformation and distribution. In order to realize this function, the power system also has corresponding information and control systems in various links and different levels to measure, adjust, control, protect, communicate and dispatch the production process of electric energy, so as to ensure that users obtain safe and high-quality electric energy. . [0003] The main structure...

AI Technical Summary

Problems solved by technology

[0005] Since the power system is a complex time-varying system, with the operation of the system, the amount of processed data is increasing, which greatly increases the computer processing power required to process data, making data processing slower or processing data costs improve

In addition, in the prior art, the recursion of the least squares method is carried out by weighting the forgetting factor. On the one hand, the old data cannot be completely cleared. On the other hand, in some existing technologies, the total weighted value of the old data and the new data Greater than 1 makes the solution value offset

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