Converter tilting DC control system and current sharing method

A DC control system, converter technology, applied in the control system, DC motor speed/torque control, electrical components, etc., can solve the problems of explosive and fast melting, uneven current, and performance differences of the silicon controlled rectifiers of the four devices, etc. Achieve the effect of ensuring safe production and improving current sharing

Inactive Publication Date: 2016-12-14
DALIAN HUAYELIAN AUTOMATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest problem it has is the average current distribution of each device. If the system pulse is deviated by some kind of interference, or the performance of the thyristors of the four devices is different, it will cause serious unevenness of current, and even continuous explosions. fast melting phenomenon

Method used

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  • Converter tilting DC control system and current sharing method

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Embodiment

[0042] Remove the parallel connection on the output side of the four speed control devices in the original plan to realize decoupling control electrically. In actual operation, due to the accumulated gear clearance of the multi-stage reduction box, the four motors are no longer rigidly connected in theory, but It is by no means a theoretically flexible connection. It is called a rigid connection with gaps. There is no master-slave distinction in control, and it is relatively independent in speed control. Therefore, to transform the existing scheme, the structure of the converter tilting DC control system is shown in figure 1 :

[0043] An independent rectifier transformer is installed for each speed regulating device on the AC incoming line side, and it also plays the role of electrical isolation among the units. Set smoothing reactors for each speed control device on the AC incoming line side. Add 10% softening resistance to each motor armature on the output side of the dev...

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Abstract

The invention relates to a converter tilting DC control system and a current sharing method. The converter tilting DC control system comprises four control units. Each control unit controls one motor. Each control unit comprises a speed adjusting device, a rectification transformer, an inlet wire reactor, a smoothing reactor, a softening resistor and a current diverter. An AC inlet wire end is connected with the input side of the rectification transformer. The output side of the rectification transformer is connected with the speed adjusting device through the inlet wire reactor. The speed adjusting device is connected with the motor through the softening resistor and the current divider. The motor is connected with the speed adjusting device through the smoothing reactor. The rotating speed difference of the four motors is less than 10r / m so that the armature current difference of the motors is ensured to be within 55A. The advantages are that parallel connection of the DC side is eliminated and changed into independent control by using the decoupling mode and the mode of master-slave control is not adopted so that current sharing of the four speed adjusting devices can be guaranteed and safe production of the tilting system can be guaranteed.

Description

technical field [0001] The invention belongs to the field of metallurgical converters, in particular to a converter tilting direct current control system and a current equalization method. Background technique [0002] The converter tilting system generally uses four debugging devices to drive four motors to run. The output sides of the four driving devices are connected in parallel, and are controlled by master / slave control. The master device has a speed loop and a current loop, and the slave device has neither a current loop nor a speed loop. The slave device receives the control pulse of the master device, thus Follow the master device to control the current output of the slave device. The biggest problem it has is the average current distribution of each device. If the system pulse is deviated by some kind of interference, or the performance of the thyristors of the four devices is different, it will cause serious unevenness of current, and even continuous explosions. ...

Claims

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Application Information

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IPC IPC(8): H02P7/285
CPCH02P7/285
Inventor 张丽严树平赵中杨郭一鸣
Owner DALIAN HUAYELIAN AUTOMATION
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