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Mine Locomotive DC to AC Inverter and Torque Control System

An AC inverter, locomotive technology, applied in control systems, vector control systems, motor generator control and other directions, can solve the problems of device current level limitation, increase manufacturing cost, small starting torque, etc., achieve low manufacturing cost, The effect of short starting time and large starting torque

Active Publication Date: 2017-07-21
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to suppress the starting overcurrent, most of the power electronic devices with high current margin are used, which is acceptable in small-capacity devices, but when applied to medium and large-capacity frequency conversion speed regulation systems, they are limited by the current level of existing devices
In order to suppress the starting overcurrent, soft start can be used, but the starting torque is small and the starting time is long
Most of the power electronic devices with high current margin are used, which greatly increases the manufacturing cost

Method used

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  • Mine Locomotive DC to AC Inverter and Torque Control System
  • Mine Locomotive DC to AC Inverter and Torque Control System
  • Mine Locomotive DC to AC Inverter and Torque Control System

Examples

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Effect test

Embodiment 1

[0018] Such as figure 1 As shown in the figure, a mining locomotive DC-to-AC inverter has three branches connected in parallel between the positive and negative poles of the DC power supply. The first one is the resistor R1 and the resistor R2 after series connection, and the second one is the start-up circuit after series connection. Rheostat RS and IGBT tube T7, the third is the IGBT conversion module; the overvoltage protection module is located between the first branch circuit and the second branch circuit, and the output terminal is connected to the output terminal of the fault signal processing unit. It is used to detect the voltage at the input terminal of the DC power supply, and when the voltage exceeds the threshold value, protection is provided; the overcurrent detection module is located between the first branch circuit and the second branch circuit, and the output terminal is connected to the input terminal of the fault signal processing unit connection, used to d...

Embodiment 2

[0021] Such as figure 2 As shown, the present invention also discloses a mining locomotive torque control system, which is characterized in that it includes: a speed controller for comparing the actual measured speed with a given speed to control the actual speed; the magnetic flux reference The task of the controller is to control the amplitude of the stator magnetic flux within the allowable range through the stator voltage space vector, so that the trajectory of the magnetic flux is close to a circle, calculate according to the received magnetic flux optimization amount, and output a magnetic flux range to the torque The control module calculates; the torque reference controller is used to realize the direct control of the torque, or through the positive and negative regulator, while adjusting the torque, the correct flux linkage switch signal is given by the DMC algorithm to control the stator flux The rotation direction of the chain is used to strengthen the regulation o...

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Abstract

The invention discloses a DC-to-AC inverter and a torque control system for a mining locomotive, and relates to the technical field of devices or systems for controlling motors through magnetic field direction control. There are three branches connected in parallel between the positive and negative poles of the DC power supply of the inverter. The first is the resistor R1 and the resistor R2 connected in series, the second is the starting rheostat RS and the IGBT tube T7 connected in series, and the third is IGBT conversion module; also includes overvoltage protection module, overcurrent detection module, current detection module, DC voltage monitoring module, pump voltage detection module, microprocessor module, three-phase monitoring circuit, low-pass filter and IGBT overheating monitoring module. The system has shorter start-up time, larger start-up torque, smaller start-up current, and lower manufacturing cost of the inverter.

Description

technical field [0001] The invention relates to the technical field of a device or system for controlling a motor by controlling the direction of a magnetic field, in particular to a DC-to-AC inverter and a torque control system for a mining locomotive. Background technique [0002] Starting performance is almost one of the most important indicators to measure all variable frequency speed regulation systems, especially in AC drive locomotives and other large inertia load systems, it is generally expected to have a large starting torque during the mechanical starting process, and at the same time, the electrical starting current should be as low as possible. Small, and constant torque start, constant power operation. The 14-ton and 18-ton direct-current transmission system motors for mining often have insufficient output torque when starting, but often have a large inrush current, which may even cause damage to the switching devices in the inverter. However, during the test,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30H02P21/34
Inventor 高锋阳陶彩霞路颜
Owner LANZHOU JIAOTONG UNIV