SU1150716A1 - Device for shared control of reversible rectifier converter - Google Patents

Abstract

THE DEVICE DOLLS SEPARATE CONTROL OF THE REVERSIBLE VENTILAL TRANSMITTER A drive array containing three null-bodies, two of which are two-position, and the output of the third is connected to the input of the delay element, and the inputs of the zero-organs are connected to the corresponding frequency control unit, and the electromotive devices are connected to the input of the delay element, and the inputs of the zero-organs are connected to the control unit, and the electromotive devices are connected to the input of the delay element; according to the frequency of rotation and the transducer load current sensor, which is distinguished by the fact that, in order to increase the reliability of the converter, It is three AND-OR logical elements and a logical element NOT, the output of the delay element is NOT connected to the input of the element, the first output of the first zero-body is connected to the first inputs of the first and second logical elements AND-OR, the inverse output of the first zero-body is connected to the third input of the first AND-OR logic element and the first input of the third AND-OR logic element, the direct output of the second nullorgan is connected to the fourth input of the first AND-OR logic element and the third input of the third logical The AND-OR element, the inverse output of the second (the left zero-body is connected to the second input of the first AND-OR logic element and the third input of the second AND-OR logic element, the output of the logical element is NOT connected to the fourth inputs of the second and third logical AND elements -OR, the output of the first AND-OR logic element is connected to the second inputs of the second and third AND-OR logic elements, the outputs of the second and third AND-OR elements are intended to connect 35 to the valve group control system tel.

Description

The invention relates to electrical engineering, in particular, to converter technology, and can be used to control the switching of groups of reverse valve converters with separate control. The device is one of the possible schemes for separate control of a reversible valve converter, in which one set of a pulse-phase control system is used, connected to the Forward or Back group of thyristors. The device can be used to control the switching of groups in reversible valve converters. . The pulse-phase control system can be performed by any of the known schemes. Load reversible valve l. is a direct current motor. A device for separate control of a reversible valve converter is known, containing three zero-bodies, logic elements AND, OR, delay element, trigger lj. However, this device is not reliable enough in operation because at currents lower than the current sensor response threshold, switching logic is not compatible switches valve groups; in addition, when using a single device of a pulse-phase control, switching groups disrupts the alternation of control pulses, the interval between pulses is extended and tvetstvenno to lengthen dead time. The closest in technical essence and the achieved result to the invention is a device for separate control of a reversible ventilation converter of a direct current electromotor containing three zero-organs, two of which are two-position, and the output of the third is connected to the input of the delay element, and the inputs are zero -organisms are designed to be connected respectively to the setpoint frequency of rotation of the electric drive, the node determining the error in rotational frequency and the transducer load current sensor 2. The device also insufficiently reliable in operation since. that when using one set of a pulse-phase control system, it is necessary to have additional means (control system keys) that must connect the device for separate control of the reversible valve converter with the pulse-phase control system. The purpose of the invention is to increase the reliability of the converter. The goal is achieved by the fact that a device for separate control of a reversible valve converter containing three nullorgans, two of which are two-position, and the third of them is connected to the input of the delay element, and the inputs of the zero-organs are connected respectively to the setpoint frequency of rotation of the electric drive , the node determining the error in rotational frequency and the load current sensor is equipped with three AND-OR logic elements and NOT logical elements, with the input element and the output of the delay element is NOT connected, the direct output of the first zero-body is connected to the first inputs of the first and second AND-OR logic elements, the inverse output of the first zero-body is connected to the third input of the first I-IPI logic element and the first input of the third AND logic element -OR, the direct output of the second zero-body is connected to the fourth input of the first AND-OR logic element and the third input of the third AND-OR logic element, the inverse output of the second nullorgan is connected to the second input of the first logic element AND-OR and the third input of the second logical element AND-OR, the output of the logic element is NOT connected to the fourth inputs of the second and third logical elements AND-OR, the output of the first logical element AND-OR is connected to the second inputs of the second and third logical elements AND-OR, the outputs of the second and third AND-OR elements are intended to be connected to the control system of the valve group of the valve converter. The drawing shows a block diagram device: a dual for controlling the valve separately. The device consists of three null-bodies 1-3, delay element A,

a logical element NOT 5, three logical elements AND-OR 6-8. Input 9 is designed to be connected to the setpoint frequency of rotation of the electric drive, input 10 to the node for determining the error in rotational frequency, input 11 to the load current transducer of the converter. Outputs 12 and 13 are designed to be connected to the control system of the valve converter valve groups.

The zero-bodies 1 and 2 respond, respectively, to the polarity of the reference signal according to the frequency of rotation and the error in rotational frequency, and in the case of a positive polarity of the signal at input 1, it appears at the direct output of the zero-organ, and at negative polarity - at the inverse . The null organ 3 is tuned so that 1 appears on its output in the presence of current in the circuit, and O in its absence.

The device works as follows.

With the occurrence of 1 on the direct output of the zero-organ 1 and on the inverse output of the zero-organ 2 (which corresponds to the task, for example, in the positive direction), the output of the logical element I-ШШ 6 is 1. the output of the first zero-organ and the output of the logical element I-EPI 6 is 1, the output of the logical element AND-OR 7 is Vits 1. The output

logical element AND-OR S is present O.

When the polarity of the error signal varies in rotational frequency (which corresponds to the current value of the rotational frequency exceeding the specified frequency) 1, they are present on the first mechanisms 1 and 2. As a result, the output of the AND-OR 6 logic element is O. O is also present, as a result of which the output of the AND-OR 7 and 8 logic elements is O, therefore, 0 appears at the output of the null organ 3. After a time determined by the delay time 4, the output of the delay element is O, and output logic which element is NOT 5 1, therefore 1 in accordance with the output of the logical element AND-OR 8, and the output of the logical element AND-OR 7 is O, i.e. the braking process begins, which will occur until the current value of the rotation frequency is equal to the specified frequency.

When the reference signal changes to the opposite (which corresponds to the reverse of the rotational speed), the device operates in the same way.

The application of the proposed device allows to increase the reliability of operation, reduce the dead time, exclude additional means (keys of the control system) when using one set of the system of pulse-phase control.

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Claims (1)

A DEVICE FOR SEPARATE CONTROL OF A REVERSE VALVE CONVERTER of a DC electric drive, containing three null organs, two of which are two-position, and the output of the third is connected to the input of the delay element, and the inputs of the zero-organs are designed to be connected respectively to the speed controller of the electric drive, the unit for determining the mismatch rotation and the load current sensor of the converter, which is characterized in that, in order to increase the reliability of the converter, it is equipped with using logical four-input AND-OR elements and a NOT logical element, and the output of the delay element is NOT connected to the input of the element, the direct output of the first zero-organ is connected to the first inputs of the first and second logical AND-OR elements, the inverse output of the first zero-organ is connected to the third the input of the first AND-OR logic element and the first input of the third AND-OR logic element, the direct output of the second null organ is connected to the fourth input of the first AND-OR logic element and the third, input of the third AND logic element -OR, the inverse output of the second zero-organ is connected to the second input of the first AND-OR logic element and the third input of the second AND-OR logic element, the output of the logic element is NOT connected to the fourth inputs of the second and third AND-OR logic elements, the output of the first logical element The AND-OR is connected to the second inputs of the second and 'third AND-OR gates, the outputs of the second and third i-OR gates are designed to be connected to the valve group valve control system.