RU1805536C - Device for controlling rectifiers with intermediate sequentially commutated current inverter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the development of controlled rectifiers with a transformerless input based on thyristor series high-frequency resonant inverters. An object of the invention is to increase reliability in parallel operation under a common load. The control device comprises a voltage regulator 4, the input of which is connected to the output of the rectifier, and the output is

Description

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dinene with the input of the pulse generator 5. amplifier 6 and T-trigger 7, coupled outputs connected to the inputs of two amplifiers-shapers 8.9. The outputs of the latter are connected to the control electrodes of the valves of the intermediate parallel current inverter 2. The amplifier 6 is connected with the output to: the pin of connector 14. 8 distinguishing from the known one, the device is equipped with one vibrator 15 and two clock buses. The aforementioned pulse generator 5 is equipped with a synchronization input connected to the output of the single-vibrator 15, the contact a of the connector 14 is connected to the first synchroshina, and the second synchroshina is connected via the pin b of the connector 14 to the negative terminal of the power supply. The device allows to equalize the power taken from each of the m rectifiers during their parallel operation to the total load, ensures reliable operation when the generator of any control unit fails. 1 ill.

The invention relates to electrical engineering, in particular to rectifier control devices with an intermediate current inverter.

The purpose of the invention is to increase the reliability of several rectifiers connected in parallel to the total load.

The drawing shows a diagram of the proposed device.

The power part of each of the m rectifiers with an intermediate current inverter consists of a three-phase valve bridge with a smoothing capacitor at the output 1, an intermediate series current inverter 2, an output rectifier 3. The rectifier control device contains a voltage regulator 4 connected in series, the input of which is connected the output is rectified, and the output is connected to the input of the generator 5, amplifier 6 and T-flip-flop 7, coupled by phase-to-phase outputs connected to the inputs of two amplifiers - shapers 8.9, the outputs of which are assigned to connect to the control electrodes of the valves of the intermediate serial current inverter 2, the amplifier 6 is connected to a power source 10 and consists of a transistor 11, the base of which is connected to the generator 5, the emitter to the anode of the diode 12, the cathode of which forms the output of the amplifier b connected to pin a of connector 14, pin b of which is connected through a resistor 13 to the emitter of the transistor. 11, while the input of the single-vibrator 15 is connected to the terminal a of the connector 14 connected to the first sync bus, the output of the single-vibrator 15 to the synchronization input of the generator 5, and the second sync bus is connected via the terminal b of the connector 14 to the negative bus of the power supply 10.

The device operates as follows. Generator 5 generates pulses whose frequency is determined by the voltage from the regulator. These pulses are coming

to amplifier b, the output of which is simultaneously transmitted to the inputs of the trigger 7 and the one-shot 15 and through pin / a of the connector 14 and the synchronization cable to the first

synchroshina, while the second synchroshina through the synchronization cable and pin 6 of the connector 14 provides the closure of the passage of the clock pulses. From the output of the trigger 7, the pulses are fed to the shaper amplifiers 8.9 and then to the control electrodes of the thyristors of the serial inverter 2.

If the generator 5 rectifier 1 generated a pulse before the generator 5 rectifier P, then, going through the circuit, the output of amplifier 6, connector 14, the synchronization cable. Rectifier rectifier 1, synchroshina, synchronization cable, connector 14, trigger 7 rectifier mitel P. The synchronization pulse will cause

the operation of the second rectifier at the frequency of the first rectifier. The same impulse, coming through a single vibrator 15 to the synchronization input of the generator 5, will cause it to be forced on the second rectifier

actuation.

Due to the fact that there is a delay in the operation of the generator 5 during synchronization and it is possible to split the pulse in the synchro, one-shot 15 extends

the pulse of the generator 5 for a time exceeding the delay, which eliminates the fragmentation of the clock pulse when several generators are connected in parallel. le m rectifiers.

Since the duration of the power pulses of identical units in serial inverters is the same, when they operate at the same frequency, the powers taken from each rectifier are equalized.

The proposed device provides increased reliability of the operation of several rectifiers with parallel connection to the total load by synchronization; generator frequencies of all

rectifiers, and failure of any generator will not cause a malfunction of the rectifiers / since redundancy of the generators is provided.

With a percentage redundancy of the rectifier installation, consisting of m rectifiers equipped with the proposed device, upon failure of any rectifier, including the clock generator, the rectifier installation functions normally, since the generator of any other rectifier with the highest frequency. Replacing a failed unit is carried out without turning off the rectifier installation, so when installing a spare unit its frequency is imposed on the generator at which the system of rectifiers m operates, regardless of the frequency ratio, which can reach 2-3 orders of magnitude upon start-up.

Claims (1)

SUMMARY OF THE INVENTION A device for controlling m rectifiers with an intermediate series current inverter, comprising m identical units, each of which includes a series-connected voltage regulator, the input of which is designed to connect to the output the corresponding rectifier, a controlled pulse generator, an amplifier and a T-trigger connected to the inputs of two amplifiers with paraphase outputs shapers, the outputs of which are designed to be connected to the control inputs of the valves of an intermediate serial current inverter, the aforementioned amplifier being connected to a source The power supply is made up of a transistor, the base of which is connected to the input of the amplifier, and the emitter to the anode of the diode, the cathode of which forms the output of the amplifier, connected to pin a of the connector, pin b through a resistor connected to the emitter of the transistor, and the same pins of the connector with each the unit are interconnected, characterized in that, in order to increase reliability during parallel operation on the total load, it is equipped with a single-vibrator and two synchroshimes, the pulse generator is equipped with a synchronization input, sub li ne to the output of monostable multivibrator whose input is connected to a connector contact, connected to the first synchroshina, while the second synchroshina is connected via pin b of the connector to the negative terminal of the power supply.