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Inverse model control method of generator excitation system

A control method and excitation control technology, applied in the direction of controlling generators through magnetic field changes, can solve problems such as poor stability and low control accuracy, and achieve the effects of reliable accuracy and stability, high identification accuracy, and simple calculation.

Inactive Publication Date: 2008-04-16
HUNAN UNIV
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Problems solved by technology

[0004] In order to solve the technical problems of poor stability and low control precision in the existing generator excitation control process, the present invention provides an inverse model control method for generator excitation that is simple, reliable, good in real time, and high in control precision

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  • Inverse model control method of generator excitation system
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  • Inverse model control method of generator excitation system

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Embodiment Construction

[0019] Further description will be made below in conjunction with the accompanying drawings and specific embodiments.

[0020] Referring to Fig. 1, the engine excitation control system implementing the method of the present invention includes two parts: a feedforward inverse model controller and a feedback compensation. The physical meaning of each variable in the figure is: V t * (k) represents the expected value of generator terminal voltage, V t (k) represents the measured value of the generator terminal voltage, Indicates the generator terminal voltage identification value; u c (k) represents the synthetic actual excitation control quantity, u f (k) represents the amount of feedback control, and u(k) represents the amount of feedforward control. The inverse model controller obtains the equivalent linearized inverse model of the generator excitation system, which is used to offset the nonlinear characteristics of the excitation system. The feedforward control method i...

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Abstract

The invention relates to an inverse-model control method for a generator excitation system, including the steps: (1) terminal voltage signal Vt is collected from the generator, and sent to A / D converter for sampling, and Vt (k) is collected after sampling and read into the CPU; (2) the deviation e between the sampling value Vt (k) and the expected value V<*>t (k+1) is calculated, when e is greater than or equal to 0.005, the controlled quantity of excitation is calculated according to Step (3); otherwise, the excitation system does not act; (3) the controlled quantity of excitation is calculated as u(k)=u(k-1)+ triangle u(k), therein, triangle u(k)= V<*>t (k+1)-Vt(k) / f<1>[q(k-1),u(k-1)]; and when | triangle u(k)|is more than Delta (k), triangle u(k)= Delta (k)question mark sign(triangle u(k), herein, sign(question mark) is a symbolic function, Delta (k) is a limit to the physical characteristics of the excitation system; (4) the calculation result triangle u(k) is sent into D / A convertor, and the signal acts onto the excitation system directly. According to the expected value and the calculated value of the terminal voltage of he generator, and inverse-model control of the excitation system is achieved through the control law designed off-line. The invention is easy to implement, the computation is rapid, online study or parameter adjustment is not required, and the generator has excellent terminal-voltage adjusting performance.

Description

technical field [0001] The invention relates to an inverse model control method of a generator excitation system. Background technique [0002] The safety and stability of power system operation, that is, the dynamic safety and reliability problem, is an important issue in power system operation. The main means to improve and enhance the stability of the power system is to adopt new power equipment and control methods. The generator set is an important equipment in the operation of the power system. Its effective control is conducive to the stable, safe and economical operation of the power system, and it is also an effective link to improve the transient stability of the power system. [0003] The excitation control of the generator is one of the main measures to improve the fretting steady-state level of the transmission system. The existing excitation control of the generator has technical problems of poor stability and low control precision. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/14
Inventor 李勇军袁小芳
Owner HUNAN UNIV
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