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A method of AC variable frequency speed regulation for simulating the soft characteristics of series-excited DC motor

A technology of AC frequency conversion and series excitation DC, applied in the direction of AC motor control, electrical components, control systems, etc., can solve problems such as mechanical characteristic curves are too hard, and achieve the effects of extending cruising range, improving power factor and operating efficiency

Active Publication Date: 2018-12-14
TAIYUAN INST OF CHINA COAL TECH & ENG GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the mechanical characteristic curve of the existing low-voltage DC / AC variable frequency speed regulation system is too hard, the present invention provides an AC variable frequency speed regulation method for simulating the soft characteristics of the series excitation DC motor

Method used

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  • A method of AC variable frequency speed regulation for simulating the soft characteristics of series-excited DC motor

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Embodiment Construction

[0012] An AC frequency conversion speed regulation method for simulating the soft characteristics of a series-excited DC motor, the method is realized by the following steps:

[0013] 1) Assume that the highest speed of the AC motor when outputting the maximum torque is n1, assume that the rated speed of the AC motor is n2, assume that the highest speed of the AC motor is n3, and n1

[0014] 2) Constant torque section control: When the AC motor is used for heavy-load starting and full-load climbing, the inverter adopts the torque vector control method to control the torque of the AC motor to maintain the maximum torque and limit the maximum power of the AC motor is the rated power, and at the same time limit the maximum speed of the AC motor to n1; when the load torque > the torque of the AC motor, the speed of the AC motor is automatically reduced; when the load torque < th...

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Abstract

The invention relates to the frequency conversion speed regulation technology for a mine special battery vehicle, and particularly relates to an AC frequency conversion speed regulation method simulating series excitation DC motor soft features, so as to solve the problem that the mechanical feature curve of the existing low-voltage DC / AC frequency conversion speed regulation system is over rigid. The method is realized by adopting the following steps: 1) the input end of the AC motor and the output end of a frequency converter are connected; 2) when the AC motor is used for heavy-load starting and full-load climbing, the frequency converter adopts a torque vector control mode to control the torque of the AC motor to be maintained as the maximal torque; 3) when the AC motor is used for full-load level road driving, the frequency converter adopts a frequency given control mode to control the power of the AC motor to be the rated power; and 4) when the AC motor is used for idling driving, the frequency converter adopts a torque given control mode to control the torque of the AC motor to be maintained to be constant. The method of the invention is applied to the mine special battery vehicle.

Description

technical field [0001] The invention relates to the frequency conversion speed regulation technology of mine-used special storage battery vehicles, in particular to an AC frequency conversion speed regulation method for simulating the soft characteristics of a series-excited DC motor. Background technique [0002] At present, low-voltage DC / AC frequency conversion speed regulation system is generally used for traction of special mine battery vehicles to replace traditional series-excited DC motors. However, practice has shown that, compared with the traditional series-excited DC motor, although the low-voltage DC / AC variable frequency speed control system has many advantages, due to its own limitations, it cannot have the low-speed, high-torque, high-speed and small-rotation capabilities of the traditional series-excited DC motor. The soft characteristics of the moment lead to the problem of the mechanical characteristic curve being too hard, which leads to the problem of lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/00H02P27/06
Inventor 曹建文冯化刘国鹏姜铭许连丙布朋生呼守信贾运红薛志勇张小刚张爱荣
Owner TAIYUAN INST OF CHINA COAL TECH & ENG GROUP
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