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Overvoltage protection device, overvoltage protection method and electrolytic-capacitor-free motor driving system

A technology of overvoltage protection device and motor drive system, which is applied in the direction of emergency protection circuit device, control system, AC motor control, etc., and can solve problems such as damage to the motor drive system without electrolytic capacitors

Active Publication Date: 2015-09-23
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide an overvoltage protection device, an overvoltage protection method and a motor drive system without electrolytic capacitors, so as to solve the problem in the prior art that the motor drive system without electrolytic capacitors is damaged due to instantaneous overvoltage

Method used

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  • Overvoltage protection device, overvoltage protection method and electrolytic-capacitor-free motor driving system
  • Overvoltage protection device, overvoltage protection method and electrolytic-capacitor-free motor driving system
  • Overvoltage protection device, overvoltage protection method and electrolytic-capacitor-free motor driving system

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Embodiment approach

[0024] According to an embodiment of the present invention, the first PI controller 122 uses the following formula according to the difference V dc_err Calculate the Q-axis current compensation value I q_com0 :

[0025] I q _ c o m 0 = K p · V d c _ e r r + K i ∫ 0 t V d c _ e r r ( τ ) d τ ,

[0026] Among them, K p >0, means current control proportional gain coefficient,...

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Abstract

The invention relates to the field of motor control, and discloses an overvoltage protection device, an overvoltage protection method and an electrolytic-capacitor-free motor driving system. The overvoltage protection device comprises a voltage detection module for detecting direct-current bus voltage Vdc in real time, a current compensation dosage calculation module which is connected with the voltage detection module and is used for calculating a current compensation value according to the detected direct-current bus voltage Vdc and a preset safety voltage Vdc_max, and a current control module which is connected with the current compensation dosage calculation module and is used for generating a final current instruction value according to the calculated current compensation value and an initial current instruction value and adjusting three-phase current input into a motor by an inverter according to the final current instruction value in order to avoid overvoltage damage of the electrolytic-capacitor-free motor driving system. Through adoption of the voltage protection device and method and the electrolytic-capacitor-free motor driving system, the three-phase current of the motor can be adjusted according to the direct-current bus voltage detected in real time and the preset safety voltage, so that over high direct-current bus voltage is lowered, and the aim of overvoltage protection is fulfilled.

Description

technical field [0001] The invention relates to the field of motor control, in particular to an overvoltage protection device, an overvoltage protection method and an electrolytic capacitor motor drive system. Background technique [0002] With the improvement of consumers' energy-saving requirements for electromechanical products, variable frequency motor drives with higher efficiency have been more and more widely used. The DC bus voltage of the conventional variable frequency drive is in a stable state, and the inverter part is relatively independent of the input AC voltage, so that the control of the inverter part does not need to consider the instantaneous change of the input voltage, which is convenient for the realization of the control method. However, this design method needs to be equipped with an electrolytic capacitor with a large capacitance, which makes the size of the driver larger and the cost is correspondingly increased. In addition, electrolytic capacitor...

Claims

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Application Information

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IPC IPC(8): H02H7/09H02P27/08
Inventor 张国柱
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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