Power balance control method of frequency converter multi-motor dragging system and test device

A drag system, power balance technology, applied in the control of electromechanical transmission, motor generator control, electronic commutation motor control, etc., can solve the problem of relying on the performance of liquid viscous transmission and not reaching it.

Active Publication Date: 2012-03-07
CHANGZHOU LIANLI AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this control principle largely depends on the performance of the liquid-viscous transmission device, and it is easily affected by it during long-term use and cannot achieve the expected effect.

Method used

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  • Power balance control method of frequency converter multi-motor dragging system and test device
  • Power balance control method of frequency converter multi-motor dragging system and test device
  • Power balance control method of frequency converter multi-motor dragging system and test device

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Experimental program
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Embodiment Construction

[0018] The power balance control method of the frequency converter multi-machine drive system of the present invention includes the following steps,

[0019] At the beginning, set a frequency converter as the main frequency converter, and determine a benchmark for power balance of the multi-motor drive system. Then set the slave inverter that is hard-connected with the drive motor of the main inverter as the first type of slave inverter. The hard-connected motor mentioned here is the motor that is coaxially connected with the drive motor of the main inverter; The slave frequency converter of the softly connected motor is the second type of slave frequency converter, and the softly connected motor mentioned here refers to the motor connected with the main frequency converter through a belt or other flexible means.

[0020] The first type of slave inverter tracks the torque of the master inverter, and the first type of slave inverter adjusts the torque of the motor connected to ...

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Abstract

The invention relates to power balance control for a multi-motor dragging system, in particular to a power balance control method of a frequency converter multi-motor dragging system for a belt conveying system and a test device. The control method comprises the following steps of: arranging a main frequency converter, and adjusting the torque of a frequency converter in rigid connection with the main frequency converter to be consistent with that of the main frequency converter; and adjusting the rotating speed of a frequency converter in flexible connection with the main frequency converter to be consistent with that of the main frequency converter. The test device comprises a plurality of motors and frequency converters and also comprises coaxial rigid dragging parts formed between every two motors and heteroaxial flexible dragging parts formed between the coaxial rigid dragging parts and other motors; the output ends of the motors are connected with torque rotating speed sensors; and the output end of the test device is connected with a load. By using the control method, the power of the multi-motor dragging system can be enabled to be balanced, and the test device is used for testing.

Description

technical field [0001] The invention relates to power balance control of a multi-motor drive system, in particular to a power balance control method and a test device for a frequency converter multi-machine drive system of a belt transmission system. Background technique [0002] With the country's integration and transformation of coal mines, the output of a single coal mine is getting bigger and bigger, and its coal conveyor belt is getting longer and longer. In coal mines with an annual output of 10 million tons, the length of the belt reaches 8-10Km, and its drive power exceeds 3MW. Therefore, multi-motor drive is often used in the drive scheme. Considering the large power of the motor, the direct start will cause the impact of the grid, the mechanical vibration of the motor is large, and the synchronization of multiple motors is poor, etc.; the belt transportation system uses more and more inverters to drive the motors to form an inverter multi-machine drag system. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P5/74H02P5/747H02P21/14
Inventor 李刚王俊士王建中张仲元李成其陈丽芬
Owner CHANGZHOU LIANLI AUTOMATION TECH
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