SU1228204A1 - Device for controlling converter - Google Patents

Abstract

The invention relates to electrical engineering and is used in control systems for thyristor pulse converters of 1 mi. The purpose of the invention is to enhance functionality and increase reliability. The device contains a generator (G 1, adjustable delay blocks (RHL) 2 and 3, amplifiers 4 and 5 with antiphase regulating characteristics, element OR 6. The entered G 1 generates pulses whose frequency is much lower than the operating frequency of the converter. RHL 2 forms them Tguls delayed and starts RHL 3, ensuring reliable start of the converter, while the minimum control signal of RHL 3 does not start. As the control signal increases, the delay time of the pulse generated by RH 3 decreases, and the delay time of RHR 2 increases. G1 does not interfere with RHL 2 and 3. When the control signal is reduced to a minimum, RHR 3 stops generating the main thyristor control pulses, and the switching thyristor control pulses will form G 1, which will ensure reliable locking of the main thyristor . 1 il. (O (L

Description

The invention relates to electrical engineering and can be used in control systems of thyristor pulse converters for regulating the voltage on a direct current motor or regulating the resistance in the rotor circuit of an induction motor.

The aim of the invention is to expand the functionality of the device and increase the case rate.

The drawing shows the block diagram of the device.

The device contains a generator) 1 with a blocking input, blocks 2 and 3 in series of adjustable delay, amplifiers 4 and 5 with antiphase control characteristics, an OR element, the output of which is connected to the start input of block 2.

The device works as follows.

1 Operator 1 generates pulses whose frequency is much lower than the operating frequency of the converter. Simultaneously, a minimum voltage is applied to the first inputs of amplifiers 4 and 5. Block 2, upon arrival of the first pulse from generator 1, generates a pulse with a minima delay, which triggers block 3 and generates a control pulse of the switching thyristor, ensuring a smooth start of the converter.

As long as the control signal is minimal, block 3 is not channeled.

Three increases of the control signal start block 3 first with a maximum delay time, ensuring the cyclic start of block 2. As the signal increases, control 1a delays the pulse generated by block 3 to decrease and the delay time of block 2 increases. In this case, the period of operation of the converter remains unchanged, and the turn-on factor of the main thyristor increases. Iri is. Pulses from block 3 block the gene (rator 1, which does not interfere with the operation of the oscillator composed of blocks 2 and 3.

When the signaling signal is controlled, the control unit to the minimum of the unit 3 moves to form the main thyristor pulses.

and the control thyristor impulses continue to form under the action of generator 1, which, after the refinishing of operation of unit 3, again starts to block unit 2 at a low frequency, ensuring reliable closing of the thyristor OCHOBHOIXJ.

Note: 1 ;; e 1p) of the device provided allows simultaneously controlling the switch-on and transfer coefficient of the converter by a control signal, which extends its functionality. Ensuring priority in setting switching thyristor m. Provides an increase in reliability of the device in operation.

Claims (1)

Invention Formula A device for controlling a converter with a commutator and head of thyristors, containing two series-connected blocks of adjustable delay, the outputs of which are intended to be connected to the control electrodes, respectively, of the commutator and main thyristors of the converter, characterized by expanding the functionality and increasing the 1 level of reliability, it is equipped with double-sided bass; 1c) looper, and an input, an OR element, and two wuxi: n-1 glasses with antiphase or | M) voc1p) 1st characteristics, outputs to- RL lx are connected to the control inputs of the co: T5tstv - blocks of adjustable backplane. moreover, the output of the generator with b.yukir.u.unlm input through the first input of the output of the 1st OR OR ITO.T- is connected to the triggering input of the first b. Adjustable delay delay, the output of which is connected to the start-up input of the second adjustable-delay unit, the output of the latter through the second input of the Io W element is connected to the start-up input of the first adjustable delay block and the generator input with a blocking input, the first inputs of the amplifiers are connected to the signal source control, the second output of the first amplifier is a pre-step e d; 1I is connected by a source of n; 1P1) of a mix.