SU1501211A1 - Device for monitoring operability of control system of multiphase thyristor converter - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to expand the scope. This goal is achieved due to the fact that control of the control system with both wide and narrow control pulses is ensured. When a spurious control pulse occurs, or a next control pulse is passed, one logical level appears at the output of one of the EXCLUSIVE OR elements 15-18, which through the OR 13 element and the first delay element 11 triggers the executive of element 12. With simultaneous disappearance of pulses on adjacent even and odd output channels of control system 1, the element OR-NOT 14 is triggered and at its output there is a single logic level, which d through the OR gate 13 and the first delay element 11, triggers the actuator 12. 1-yl.

Description

3150

The invention relates to electrical engineering and can be applied in devices for protecting and controlling valve converters.

The purpose of the invention is to expand the field of use of the control device.

The drawing shows a block diagram of the proposed device.

The device for controlling the control system 1 by a multiphase thyristor converter 2, the corresponding control inputs connected to n odd 3-6 and even 7-10 output channels of the control system .1, contains the first delay element 11 connected by the output to the actuator 12, and the input - to the output (n + 1) of the input element ШШ 13, one input of which is connected to the output of the element IL11-HE 14, and its other inputs are connected to the outputs of the corresponding elements EXCLUSIVE OR 15-18, one and the other inputs are connected respectively to one and the other inputs of the corresponding two-input elements OR 19 22- and connected to the outputs of the corresponding one-shot 23-30. Additional n delay elements 31-34 are connected by inputs to the corresponding odd output channels 3, 4, 5 and 6 of control system 1, and the outputs of additional delay elements are connected to the inputs of the corresponding n single vibrators 23, 25, 27 and 29, whose outputs are connected to one of the inputs of the elements. SELECTING SHSh 15-18, the other n single vibrators 24, 26, 28 and 30 are connected by inputs to the Corresponding even output channels 7, 8, 9 and 10 of the control system 1. The outputs of the two-input elements SH 19 19 20, 21 and 22 are connected to the corresponding inputs of the SHSh-HE 14 element.

The control device operates as follows.

At the outputs of the control system 1 of the thyristor converter 2 to turn on the thyristors, voltages are formed in the form of pulses of arbitrary duration. The pulses taken from the odd 3, 4, 5 and 6 output channels of the control system 1 are delayed (when) by the delay elements 31-34 (at) by an angle of 60 electrical degrees. Odd output channel delay pulses

0 5 0 s o s

0

five

and pulses of even output 1-1X channels. control systems are fed to the inputs of one-shot 23-30, which convert these pulses into wide pulses, the duration of which (when) is 120 eh grades.

During normal operation of the control system at the outputs of the EXCLUSIVE SHSh 15-18 elements there is a zero logic level. Also, the zero logic level is present at the input of the multi-input element OR 13, since there is always a single logic level at one of the inputs of the ШШ-НЕ 14 element.

Thus, at the output of the element OR 13, a zero logic level is maintained, which informs about the normal (without failures and false pulses) operation of the control system.

In the presence of a false and (or) no pulses at one of the outputs of the control system 1, a single logic level appears at the output of one of the EXCLUSIVE OR elements 15-18, which, having passed through the SHSh 13 element and the first delay element 11, triggers the executive item 12.

With simultaneous disappearance of pulses on adjacent even and odd output channels of the control system, the W-NOT 14 element is triggered and at its output a single logic level appears, which, having passed through the OR 13 element and the first delay element 11, triggers the actuating element 12.

Claims (1)

Invention Formula A device for monitoring the operability of a control system of a multiphase thyristor converter having n even and n odd output channels, containing (n + 1) -WH element and a delay element connected by an output to the actuator input, characterized in that , it is equipped with 2n one-shot, additional n delay elements, two-input OR elements, n EXCLUSIVE OR elements and 515 elements an OR-NOT volume with n inputs, the output of the OR element is connected to the input of the delay element, one input of the (n + 1) input element OR is connected to the output of the OR-NOT element, and each of the other n inputs is connected to the output of the corresponding element EXCLUSIVE OR, the first and second inputs of each element EXCLUSIVE OR are combined with the first and second inputs of the corresponding two-input element OR and connected to the outputs of the corresponding one-shot, additional delay elements are pre- 14 assigned to connect the inputs to the corresponding odd output channels of the control system, the outputs of additional delay elements are connected to the inputs of those n one-vibrators, whose outputs are connected to the first inputs of the EXCLUSIVE OR elements, the inputs of the other n one-vibrators are connected to the corresponding even-numbered channels of the control system, and the outputs two-input elements OR .connected to the corresponding inputs of the element OR NOT.