Detection method, detection device, frequency converter, frequency conversion system and storage medium

A frequency conversion system and detection method technology, applied in the direction of measuring devices, electrical devices, measuring electrical variables, etc., can solve the problems of electric power errors, inability to accurately reflect the actual power of the motor, and inability to reflect it

Active Publication Date: 2022-02-15
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The electric power obtained by adding the product of the direct-axis voltage and the direct-axis current, and the product process of the quadrature-axis voltage and the quadrature-axis current, since the direct-axis voltage and the quadrature-axis voltage need to be regulated by PI, at least one control The cycle can be applied to the motor, and the electric power has a large error compared with the actual power
[0004] (2) Using torque T n Although the *ω method can accurately measure the output mechanical power of the motor, it cannot reflect the copper loss and iron loss generated by the conversion from electrical power to mechanical power, as well as the electric energy consumed by the motor for magnetic field weakening after the field is weakened. Therefore, this method cannot accurately reflect the actual power of the motor

Method used

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  • Detection method, detection device, frequency converter, frequency conversion system and storage medium
  • Detection method, detection device, frequency converter, frequency conversion system and storage medium
  • Detection method, detection device, frequency converter, frequency conversion system and storage medium

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Embodiment 1

[0098] The power detection method of the frequency converter according to another embodiment of the present invention, such as Figure 4 As shown, the current sampling module is set at one input end of the inverter module. The current sampling module is formed by a parallel connection of sampling resistors and RC filters. The DC bus current is determined according to the sampling results of the current flowing through the sampling resistors; the DC bus current The input RC filter performs the filtering operation to configure the average DC bus current.

[0099] The AD calibration configuration is performed on the average DC bus current to generate a calibration current; the AD calibration configuration is performed on the DC bus voltage to generate a calibration voltage, and the inverter power is determined according to the calibration current and the calibration voltage.

[0100] In this embodiment, AD correction is performed on the average DC bus current and DC bus voltage r...

Embodiment 2

[0104] The power detection method of the frequency converter according to another embodiment of the present invention, such as Figure 5 As shown, the current sampling module includes three sampling resistors connected in series with the switching devices in the three-phase lower bridge arm of the frequency converter, and an RC filter. One end of the RC filter is respectively connected to the switching devices and the corresponding sampling resistors connected in series The connection point between them, the other end of the RC filter is grounded, and the three-phase sampling current is collected through three sampling resistors respectively; the three-phase sampling current is input into the RC filter to perform filtering operation, so as to configure the average DC bus current.

[0105] The AD calibration configuration is performed on the average DC bus current to generate a calibration current; the AD calibration configuration is performed on the DC bus voltage to generate a...

Embodiment 3

[0109] According to another embodiment of the present invention, the detection method of the frequency converter input current, such as Figure 4 As shown, the current sampling module is set at one input end of the inverter module. The current sampling module is formed by a parallel connection of sampling resistors and RC filters. The DC bus current is determined according to the sampling results of the current flowing through the sampling resistors; the DC bus current The input RC filter performs the filtering operation to configure the average DC bus current.

[0110] The AC input signal is a three-phase AC signal, and the power factor at the input terminal is determined according to the rectification module and the frequency band of the AC signal.

[0111] In this embodiment, for a three-phase AC input inverter, when a single inverter operates in the medium and high-speed frequency band, the input current I is estimated ac makes sense because I ac It is generally used to ...

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Abstract

The invention provides a detection method, a detection device, a frequency converter, a frequency conversion system and a storage medium, wherein the power detection method of the frequency converter includes: configuring the corresponding average DC bus current according to the current sampling module in the frequency conversion drive circuit; The average DC bus current and DC bus voltage determine the output power, and the output power is recorded as the power of the inverter. Power supply, the DC bus voltage is the input terminal voltage of the inverter module. The technical solution of the present invention is conducive to improving the reliability of the detection of the frequency converter power. Compared with the calculation method of the frequency converter power in the related art, the calculation of the frequency converter electric power can be effectively improved without increasing the hardware cost. precision.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a power detection method of a frequency converter, a power detection device of a frequency converter, a frequency conversion system and a computer-readable storage medium. Background technique [0002] In related technologies, when the power of the variable frequency motor system is calculated in the following manner, there are corresponding defects: [0003] (1) The electric power obtained by adding the product of the direct-axis voltage and the direct-axis current, and the product process of the quadrature-axis voltage and the quadrature-axis current, since the direct-axis voltage and the quadrature-axis voltage need to be regulated by PI, at least one control The cycle can be applied to the motor, and the electric power has a large error compared with the actual power. [0004] (2) Using torque T n Although the *ω method can accurately measure the output mechanical power of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/00G01R19/00G01R19/02G01R21/06G01R21/00G01R1/30
CPCG01R19/003G01R19/02G01R21/06G01R21/006G01R1/30
Inventor 周超小仓健钱雄王豪浩
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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