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Method for preventing bus voltage from excessing

A bus voltage, DC bus voltage technology, applied in the direction of electrical components, control generator, motor generator control, etc., to achieve the effect of smooth deceleration process, prevent overvoltage fault, and ensure accuracy

Inactive Publication Date: 2002-06-19
SOMER LEROY ELECTRO TECH FUZHOU CO LTD
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  • Abstract
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is how to control the DC bus voltage in the vector control system of the motor, so as to ensure that the system decelerates smoothly at the fastest speed under the premise of no overvoltage fault, thereby preventing the DC The purpose of the bus voltage pump is too high

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  • Method for preventing bus voltage from excessing

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Embodiment Construction

[0023] The method proposed by the present invention is to form a closed-loop control of the DC bus voltage of the frequency converter during the deceleration process of the motor, and ensure that the DC bus voltage of the frequency converter will not exceed the set voltage threshold by adjusting the speed of the motor, thereby preventing the bus voltage from pumping too high caused by the failure. How to add the frequency converter DC bus closed-loop control to the vector control system is the key point of the method of the present invention.

[0024] In the vector control system of the AC motor, the motor operates below the fundamental frequency for constant flux control, at this time the stator current excitation component is the no-load current value of the motor, and above the motor fundamental frequency for constant power control, at this time the stator excitation current Changes according to the law of field weakening control, that is to say, the excitation current comp...

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Abstract

The invention relates to a method for preventing the voltage of dc bus in transducer from raising. The method includes following steps:. The voltage of dc bus in the transducer is controlled in closed loop, based on detected voltage. The closed loop control is realized by following procedure. Whether the negative operation for the outputting value of the voltage closed loop carriers on or not is dependent on the moving direction of electric motor. That is: when the motor moves in positive direction, the operation needs to execute; when the motor in negative direction, the operation does not need to execute. The invented method can effectively prevent dc bus in transducer from over voltage fault in slowdown process. The invention guarantees the accuracy and smoothness in controlling speed.

Description

technical field [0001] The invention relates to motor technology, in particular to a method for preventing the DC bus voltage of a frequency converter from rising too high in a vector control system of an AC motor. Background technique [0002] In the prior art, the vector control of the AC motor has been widely used in the transmission field. The control idea is to decompose the stator current of the AC motor into two parts, the excitation current and the torque current, and to control the motor separately according to the control idea of ​​the DC motor. Magnetic flux (excitation current component of stator current) and output torque (torque current component of stator current), figure 1 It is the structure diagram of the most widely used vector control system using voltage source PWM inverter in the prior art. [0003] figure 1 The shown stator current torque component command and excitation current component command are the current values ​​in the synchronous rotating c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/18
Inventor 李俊田刘宏鑫裔杰
Owner SOMER LEROY ELECTRO TECH FUZHOU CO LTD
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