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MW-stage cage-type asynchronous machine starting circuit and method

A technology of starting circuit and soft starting circuit, applied in electrical components, motor generator control, control system, etc., can solve problems such as uncontrolled, large starting current, etc.

Active Publication Date: 2013-03-13
XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a starting circuit and starting method for a MW-level cage-type asynchronous motor to solve the problem that the existing MW-level cage-type asynchronous motor has a large starting current and is out of control

Method used

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  • MW-stage cage-type asynchronous machine starting circuit and method
  • MW-stage cage-type asynchronous machine starting circuit and method
  • MW-stage cage-type asynchronous machine starting circuit and method

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Embodiment Construction

[0019] Description will be made below in conjunction with the accompanying drawings.

[0020] Startup circuit embodiment

[0021] like figure 1 , The MW-level starting circuit of the present invention is mainly composed of a MW-level full-power converter (two parts of the grid-side converter and the machine-side converter) and a soft-start circuit. The grid-side converter realizes the stable control of the DC bus voltage and the unit power factor control of the AC input current, and the machine-side converter is connected with the stator of the cage-type asynchronous machine to realize the start-up and speed regulation control of the MW-level asynchronous motor.

[0022] The grid-side converter is mainly composed of three half-bridge power modules IPM1, IPM2, and IPM3. Ld1, Lg1, Cg11, and Cg12 are grid-side second-order filters; soft-start contactor KM3, soft-start resistors R11-R14, rectifier Bridge REC1, a soft start circuit composed of F1-F2; DL3 is a circuit breaker at t...

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Abstract

The invention relates to an MW-stage cage-type asynchronous machine starting circuit and method. The starting method comprises the following steps of: closing a soft start contactor, and charging a direct current bus through a soft start circuit; establishing stable direct current bus voltage by modulation of a grid-side converter, and controlling input current to be a unit power factor; closing a ram side contactor to implement constant current closed loop starting at a set current amplitude Ipeak, wherein the initial value of a start frequency f is zero; and converting into a constant voltage frequency ratio control manner when the current frequency f reaches up to a frequency switching point fc. By adopting the method, on one hand, start current can be effectively reduced, on the other hand, smooth switching from a start way to a normal operating way can be achieved.

Description

technical field [0001] The invention relates to a starting circuit and a starting method of a MW-level cage-type asynchronous machine. Background technique [0002] The starting of the cage-type asynchronous motor has always been concerned by people. For example, when an ordinary squirrel-cage motor is started directly at full voltage, the starting current reaches 5 to 7 times the rated current, and causes a sharp drop in the grid voltage, which reduces the starting torque, causes starting failure, and affects the normal operation of other electrical equipment. run. At the same time, direct starting will inevitably bring great impact to the motor itself, resulting in overheating and affecting the service life. The larger the motor capacity, the deeper the impact. Traditional solutions include step-down starting methods such as star-delta starting, autotransformer starting, etc. Although the starting current is reduced, the starting torque is also reduced at the same time,...

Claims

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Application Information

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IPC IPC(8): H02P8/04
Inventor 姚为正肖鹏刘刚许恩泽何庆冯宇鹏刘海舰李海鲲
Owner XJ ELECTRIC
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