SU1631680A1 - One-channel device for control of pulse static converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control thyristors of rectifying and inverting installations. The purpose of the invention is to increase the reliability and extend the electrical equipment life by reducing the likelihood of subharmonic self-oscillatory modes, as well as reducing the level of non-canonical harmonics in the spectrum of the input and output variables of the static converter. This device contains the shaper 1 reference signal codes, a comparator 2, logic elements 2I 3 and 6, a distributor of 4 pulses, a synchronization unit 5, a generator 7 of a random signal, an inverter 8 and a logic node 9. 1 c.p. f-ly, 4 ill.

Description

FIG. 2

 I I I I I I I I I I I I

Output 7 n I-1P

Si I

Trick or

Hi P

in.

Claims (2)

Claim 1 = 1, 2 ..... t / 2, ... and as t / 2 we take the nearest larger integer to half the pulse m of the converter, the first input of the first AND element is connected to the output of the comparator, the second input to the output of the inverter, and the output to the aforementioned input a of the driver of the reference signal and the input of the pulse distributor. 1 = 1 where CH 1-1) · 2 π / m, Si - signals at the output of the synchronization block; yi are the signals at the output of the pulse distributor; 1 = 41 = 1 I = jl I = m2 Bm / 2 = V (yi — E.-S |) V (y _t + -CL-S |):, ² 1-1 -I B = V C | -B |, 1. A single-channel device for controlling an m-pulse static converter, comprising a synchronization unit, the inputs of which are designed to be connected to the buses of the supply network and forming at the output S _{o a} sequence of short pulses in phase with m points of natural switching of thyristors, a pulse distributor, outputs yi ... y _m which are intended for connection to the control inputs of the converter and the series connection of the reference signal generator with data inputs B and a for the control input & input and the initial conditions from the synchronization unit and the input "to control the instantaneous change in the phase of the reference signal by an angle equal to 2l / t, a comparator, the first input connected to the output of the reference driver, the second input connected to the terminal for connection to the source of the control signal, the inverter and the first element And, characterized in that, in order to increase the reliability and extend the life of electrical equipment by reducing the likelihood of subharmonic self-oscillating modes, as well as reducing the level non-canonically harmonics in the spectrum of the input and output variables of the static converter 5, it is equipped with a random signal generator, a second AND element, a logical node whose outputs are connected to the information inputs B of the reference signal driver, the output of the second element 10 AND is connected to the control input L of the reference signal driver and the input of the inverter, a first input - with the output of random signal generator and the second input - to the output So a synchronization block 15 that is configured with additional outputs Si ... S _m for pulse shaping with a duration equal to the interval between the natural switching currents of the 1st and (1 + 1) -th thyristors, and the 20 mentioned outputs of the Si ... Sm synchronization unit together with the outputs yi ... ym of the pulse distributor are connected to the inputs of the logical node, which performed by implementing logical expressions 25. I —m Bi = V (y] = 1 Si) Vy _m Si; l = 2 i = mI = 2 B ₂ = V (yi -2Si) V (yi + m -2 -Si); i = 31 = 1 I = mI = 3 83 = V (yi-3Si) V (y j + m - 3'Si); 2. The device according to claim 1, characterized in that, in order to ensure the invariance of the control characteristics of the converter when the frequency of the supply network changes, the driver of the reference signal is made with a tunable natural frequency, the input for control of which is connected to the output So of the synchronization block. Figure 2 Φαι.3