Method and system for starting synchronous motor

A synchronous motor, output current technology, applied in the starter, motor generator/starter, starting device of a single synchronous machine, etc., can solve the problems of system instability, resource loss, difficulty in starting the synchronous motor, etc., and achieve alleviation The effect of resource consumption, smooth acceleration, and system stability improvement

Active Publication Date: 2019-03-22
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The present invention provides a method and system for starting a synchronous motor, the purpose of which is to solve the problem of difficulty in starting a synchronous motor and further alleviate the resource loss caused by the failure of starting a synchronous motor and system instability

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  • Method and system for starting synchronous motor
  • Method and system for starting synchronous motor

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Embodiment Construction

[0038] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] The invention provides a method for starting a synchronous motor, such as figure 1 As shown, the method includes the following steps:

[0040] Step S11, connecting the static frequency converter connected with the synchronous motor to an AC power supply;

[0041] Step S12, controlling the inverter of the static frequency converter to enter the intermittent current commutation mode; and controlling the rectifier of the static frequency converter to accelerate the rotor of the synchronous motor by using a current closed-loop control mode;

[0042] Step S13, when the rotor speed of the synchronous motor reaches 10% of its rated speed, control the inverter of the static frequency converter from the current discontinuous commutation mode to the counter electromotive force commutation control mode; and use the speed-current T...

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Abstract

The invention provides a method and system for starting a synchronous motor. The method comprises the steps of enabling the synchronous motor to be started and accelerated until reaching a set speed through controlling the output current of a static frequency converter; re-establishing the output current by means of supplementing the pulse and adjusting the pulse width when the establishment of the output current is failed; and determining the adopted control mode according to the output current when the speed of the synchronous motor reaches 10% or above at the same time so as to enable thesynchronous motor to continue to accelerate. The technical scheme provided by the invention is wide in application range, can quickly and accurately recover the output current when the establishment of the output current is failed, and can solve the problems such as speed oscillation of the synchronous motor.

Description

technical field [0001] The invention relates to the field of motors and power electronics, in particular to a method and system for starting a synchronous motor. Background technique [0002] Large-scale AC synchronous motors are widely used in industrial high-power occasions such as gas-fired power generation, pumped storage, and large-scale oil and gas transmission due to their advantages such as adjustable power factor and high motor efficiency. However, the start-up process of large-scale synchronous units is difficult, which often causes problems such as high energy consumption and low stability. In the field of high-voltage and high-power frequency conversion, the current source AC-DC-AC load commutation frequency converter is the mainstream of the large-scale synchronous motor frequency conversion starting device because of its simple structure, large capacity, high reliability, low cost and mature technology. technology. [0003] Static variable frequency start has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20H02P1/46
CPCH02P1/46H02P6/20
Inventor 姬联涛付建忠王德顺刘英军俞斌梁国辉杨波苏小娟
Owner STATE GRID CORP OF CHINA
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