SU1039013A1 - Reversible converter separate control method - Google Patents

Abstract

A METHOD FOR SEPARATED CONTROL OF A REVERSIBLE TRANSMITTER, consisting of forming minimum and maximum limit of control angles, comparing control and reference voltage signals, comparing the result with the minimum and maximum limit of control angles and generating control pulses, applying differences, and applying difference signals, and applying individual signals of minimum and maximum control angles; that, in order to increase speed, in the cument of the end-of-current pause blocking the signals of the minimum and maximum limitation, and at the time of generation of the control pulse for the first pair of thyristors. (P

Description

with

UD

The invention relates to electrical engineering, in particular, to methods for controlling thyristor converters, and can be used to control the switching of thyristor groups of reversible rectifiers and frequency converter with separate control of thyristor groups. A known method of joint control of reversible thyristor converters, consisting in simultaneously supplying control pulses to thyristors of oppositely directed rectifying groups Cl. The disadvantage of this method is the presence of a circulating control current, additional reactor equipment, low reliability. But, moreover, its closest to the technical essence of the present invention is a method of separate control of the converter, which consists in generating signals of the maximum and maximum limitation of the control angles, the signals of the control and reference voltages are compared, the result of the comparison is compared with the signal of minimum and maximum limitation of the control angles and produce control pulses for the thyristors of the Gz converter}. The disadvantage of this method is the limitation of the minimum and maximum control angles, which does not allow the initial opening of any pair of thyristors after a dead time, which reduces the speed and deteriorates the dynamic properties of the appliance. The purpose of the invention is to increase the speed of interaction. The goal is achieved by blocking the minimum and maximum limit of the control angles at the time of the dead-end pause for the first thyristor pair. FIG. 1 shows a device diagram for implementing a method for separately controlling a converter; in fig. 2 shows an example of the implementation of a phase control unit; in FIG. 3, temporary diagrams, according to the operation of the device, are implemented. In FIG. Figure 3 shows a - phase voltage diagrams, b - ranges of change of control angles for each thyristor taking into account the minimum (5 e. Deg.) And maximum (150 e.h.) of control angle angles, c - sequence n, ary of 1F key pulses from the angle of control. oL 150 el.grad, g — sawtooth-shaped reference voltages of each thyristor, voltages determining the minimum and maximum limitation of the control angles, diagrams of the output voltage of the transformer when the inverter is switched to the nocyie current-free pause with blocking of the limiting signals Cranking control angles when generating the first pulse, e, without blocking the limit signals. The device for implementing the method of separate control of the converter on thyristors 1-1.2 f by the driving motor 13 comprises a phase control unit 14 (HFC), the inputs of which are connected to the sources of the control 15 and the reference 16 signals directly and to the source 17 of the minimum and maximum control angles through block 18 of the limit signals (BSO) .. The output of the VFU 14 is connected to the input of the switch of 19 groups (PG), the outputs of which are connected to the control of the thyristors 1-6 and 7-12, respectively. PG 19 input is connected to the output of the source 20 signal from the Convention, which is also connected via a single-selector 21 to the BSO 18 control input. Phase 14 unit 14 can be executed on the zero indicator 23 of the maximum limiting angle zero limitation, element: And 25 and 26, the amplifier 27 pulses. The device implementations works as follows. . The reference signal source 16 forms a reference voltage with a duration of linearly increasing voltage sections of about 200 electrical degrees (Fig. 2). The voltage of the source 15 of the control signal varies from 0 to U ,, f, pjncixr which corresponds to 150 electrical degrees. The signal source 17 (of the finite and maximum limit of control angles imposes a ban on the fs signaling of the thyristor control pulses of the converter in the range of 0–15 electrical degrees and 150,200 electrical degrees (Fig. 2). while decreasing the voltage of one of the phases. However, this signal does not need to be generated by a control pulse for the first pair of thyristors, if the thyristors were closed before. The signal that is necessary and to avoid gaps of the control pulses in the invert mode , Vyzyvaptsih tipping inverter. With the arrival of the signal after the dead time of the source 20. Reversing zaluskaets eschnovibrator 21, PG 19 and permits supplying control pulses to the thyristors corresponding rectifier group.

At the time of a single-pulse pulse, a 21 BSO 18 interrupts the arrival of the oats signal; 1 "C" (x BFU 14, which makes it possible to formulate a pre-emption pulse for the initial opening of any pair of thyristors.

When reversed in the spinning mode, the control pulses go to several thyristors, but only a pair of thyristors remain in operation. with the largest amount of shock voltage m.

At 4mg. 2 (D, e), it can be seen that without blocking (when the signals are reversed, the thyristors are unlocked, which can

60 el.grssh .. or 3.3 ms. The duration of the currentless naystj when reversing the thyristor converters is (4-6) ms.

After disconnecting 1 and the pulse of the one-shot 21 signals

iob

from

mefx

gtcp

source 17 is fed to the inputs of the BFU 14, which continues to operate in normal mode.

Thus, by blocking the minimum and maximum pitch angle signals after a dead pause for the duration of the control pulses generated by the first pair of thyristors, an increase in the speed of control of the thyristor converter is achieved.

CuHXf.

Claims (1)

THE METHOD FOR SEPARATE CONTROL OF THE REVERSE CONVERTER, which consists in generating the minimum and maximum 'control angle limitation signals, comparing the control and reference voltage signals, comparing the result with the kinematic and maximum angle limiting control signals and generating control pulses, characterized in that , in order to improve performance, at the time of the end of a dead time pause, the signals of the minimum and maximum control angle limits for BP The volume of the control pulse for the first pair of thyristors.