Modeling method of generator excitation system

A technology of excitation system and modeling method, which is applied to control generators, control generators through magnetic field changes, control systems, etc. , unsatisfactory accuracy, etc., to achieve the effect of clear physical concepts, easy to popularize and apply, and easy to master

Inactive Publication Date: 2008-09-24
SHANDONG ELECTRIC POWER RES INST
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Problems solved by technology

The current modeling methods of the generator excitation system mainly include the online identification method and the complete on-site measurement method, both of which have some shortcomings, and cannot meet the requirements of engineering application convenience and measurement accuracy at the same time
On-line identification method, the model parameters obtained cannot be one-to-one correspondence with the main parts of the actual equipment, and the accuracy is not satisfactory; the complete on-site measurement method cannot conveniently measure the control parameters of the microcomputer excitation regulator

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  • Modeling method of generator excitation system
  • Modeling method of generator excitation system
  • Modeling method of generator excitation system

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Embodiment Construction

[0021] The main working steps of the generator excitation system modeling method of the present invention are: collecting basic data--complete field experiment--data processing--establishing original model--applying MATLAB to carry out simulation calculation--data verification--model reduction- - Parameter checking under the power system analysis program. Specifically follow the steps below:

[0022] 1. Determine the exciter model according to the exciter used (DC exciter, AC exciter or static exciter).

[0023] 2. Study the hardware structure of the excitation regulator and the mathematical expression of software programming and its logical relationship, draw the block diagram of each functional block of the automatic voltage regulator and the logical relationship diagram between them, and determine the original model of the automatic voltage regulator.

[0024] 3. Study the working principles and implementation methods of various restrictions and protections, and the logica...

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Abstract

The invention provides a modeling method for a generator excited system which comprises the following steps: (1) obtaining the idle load characteristic of the generator, the idle load and the load characteristics of an exciting dynamo, the time constants of the generator and the exciting dynamo, the phase position and frequency characteristic of the generator excited system and the damping effects of low frequency oscillation by experiments; (2) building a field system model; (3) analyzing the obtained basic data to obtain normalized model parameters, building an original simulation model in a Matlab emulator to carry out step response simulation and carrying out corresponding corrections of the parameters in the model according to simulation calculation and field experiment errors until the errors meet the requirements; (4) transforming the parameters into practically useful model parameters in a power system analyzing program and carrying out further correction of the model parameters in the program according to the specific characteristics of the original model. The model parameters of the field system obtained by the invention have the advantage of enough precision, which can really reflect the performance indexes of the field system.

Description

technical field [0001] The invention relates to a method for establishing a mathematical model of an excitation system of a generator. Background technique [0002] Due to the tremendous development of generator excitation control technology and the improvement of system performance, the role of excitation system in power grid voltage quality and system stability is becoming more and more important, making the performance of excitation system a factor that cannot be ignored in the calculation and analysis of power system stability. The increasing scale of power system puts forward higher requirements for the accuracy of power system stability calculation. The low-frequency oscillation analysis of the power system and the parameter design of the power system stabilizer require the accurate mathematical model of the excitation system and accurate parameters for the calculation of the power system. The current modeling methods of generator excitation system mainly include on-l...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P9/14G06F17/00G06F17/50
Inventor 贾善杰雷鸣刘延华刘世富
Owner SHANDONG ELECTRIC POWER RES INST
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