SU120583A1 - Synchronous generator excitation control system - Google Patents

Description

The proposed excitation control system of a synchronous generator refers to a well-known type of systems of the same purpose, based on the use of a strong excitation controller containing measurable elements perceiving a change in the operating mode of the generator, amplifiers and differentiating devices inputting to the OUTPUT signal of the control system derivatives of the selected control parameters.

A feature of the proposed system is that the gains of the differentiating devices of the excitation controller are chosen equal to the time constant of the elements of the excitation control circuit itself.

This makes it possible to eliminate the effect of the constant time of the generator control system, thereby achieving simpler calculations of the generator stability and facilitating the setup of the excitation controller.

The proposed auto.mathic control system, whose structural diagram is shown in the drawing, makes it possible to relate the value of the gain factors to the time constant of the control circuit and, with an appropriate choice of these coefficients, to ensure a change in the emf. generator by law:

D / SOR,

where A / 7 is the increment of the control parameter, / Co-gain by deviation, D is the change in e-ds. generator.

This makes it possible to reduce the calculations of the static stability of regulated systems and the adjustment of the regulators themselves to a determination of the values; 1

A;:;, jч,;.; - 1 ,, / I for objectionable ;, to;; 1oros is chosen either,.; I.; P1, m:; 1 iiriiiii i / Ke. or pz conditions of provision I, i g: ;; h - .. (; I;, .- ifH -;,: (ii p. to the regulator circuit must

 i ;; i.;) ;; (K: I,;.,;.); pfKTOpil iKHlp i Ke: i;:;).

and c., 4:,: ii: chtul-ltora includes two measuring elements, IE and JE2,:; :): 1L: i) .p; 4; iiHi.iii the current nepeMCiiHoro current is rectified and then (i; .., i;) (pi.lrj / i;: fiaH the time of these elements is 0.05 sec.); , (L1: 7eL: Y, U) f; 1 amplitude gain / Co (time constant is equal to - 0); h (myre di (.) (|: for the output of the element with the coefficient M1 of the gain of the derivative Kf, r ,, - Kaa (, Kf and Kj, respectively TiTiiciiHt); three adders Ci, C2 and C3.

(15 and 1 aedey terms of A and L are denoted, respectively, ciijixpoHHoe and transient synchronous resistance of the generator along the extended axis HG.)

When changing the mode of operation of the generator, changes in the number of the rectifier and the meter of current I and current (along the longitudinal axis of the generator) are applied to the measuring elements of the IE and JaEg.

In the first cascade, the direct current signal obtained at the output of the IE element is amplified in the amplifier Y and fed to the input of the adder C. Pa. The same adder gives the signal from the output of the amplifier U, prodif (hrenzirpvaniyy in the DE element with a gain K) AEg, differentiated in the element D52, with a gain factor - (d - a}

In the second stage, the signal from the output of the dry.m.mator Ci is fed to the input of the adder Ci, firstly, directly and, secondly, through the differentiating element of the DES with the gain factor Kf ..

The work of the third stage is similar to the work of the second: the adder C ;: the signal comes directly from the output of the adder C and through the differentiating element DEg, with the gain Kp. In addition, a sipgal Vf is fed to the adder Sz, along the voltage correction circuit, which includes the measuring element of the YaE, the corrector itself / C and the integrating element. X.

From the output of the adder Sz, the signal is fed through the power unit to the excitation winding of the exciter B.

The selection of the gain factors of the differentiating elements D51-D5 is made on the basis of an analysis of the equations of the transient process of the generator excitation system. 1 oeff 1cytes of differentiating elements are determined only by the parameters of the regulation system and the generator: K, tto Tdo and Kp T, where T is 0-constant of the excitation winding time of the generator G, G., is the time constant of the excitation winding of the exciter B, Tp - constant time of the measuring element of the regulator.

In this case, the regulation of the excitation is carried out according to the law 1.

Prev invented and

1. A system for regulating the excitation of a synchronous generator with a strong excitation regulator, containing from measuring elements, perceiving a change in the operating mode of the generator, amplifiers and differentiating devices, introducing P. an output signal of the regulating system, derivatives of the selected pairs. ::: characterized in that, in order to simplify the calculations of generator stability by eliminating the influence of constant time-rot of the generator control system, as well as for ease of: trig and regulator excitations, differential coefficients