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Calculation method for input active current of high-voltage inverter, control system and power unit

A high-voltage frequency converter and power unit technology, applied in the direction of conversion equipment that can be converted to direct current without intermediate conversion, can solve the problems of low carrier frequency, large output voltage harmonics, and low calculation accuracy of input active current, etc., to achieve The effect of reducing hardware cost, accurate value, and improving calculation accuracy

Active Publication Date: 2018-02-02
SHENZHEN INVT ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carrier frequency of the output side of the power unit is low and the harmonics of the output voltage are large, so the measurement accuracy of the output voltage cannot be guaranteed at all, which will also cause the calculation accuracy of the input active current to be low

Method used

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  • Calculation method for input active current of high-voltage inverter, control system and power unit
  • Calculation method for input active current of high-voltage inverter, control system and power unit
  • Calculation method for input active current of high-voltage inverter, control system and power unit

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Embodiment 1

[0041] see figure 2 , Embodiment 1 of the present invention discloses a method for calculating the input active current of a power unit of a high-voltage frequency converter to improve the calculation accuracy of the input active current of a power unit of a high-voltage frequency converter in series with units, including:

[0042] Step 201: Acquiring the operation information of the unit-series high-voltage inverter, the operation information including the grid voltage, the output current of the inverter, and the output voltage modulation information of the power unit;

[0043] Step 202: Calculate and obtain the input voltage of the power unit according to the grid voltage.

[0044] Step 203: Calculate and obtain the output voltage of the power unit according to the output voltage modulation information;

[0045] Step 204: Calculate and obtain the input active current of the power unit according to the output current of the whole inverter, the input voltage and the output vol...

Embodiment 2

[0073] see image 3 , Embodiment 2 of the present invention discloses a high-voltage frequency converter control system, which is applied to a unit-series high-voltage frequency converter to improve the calculation accuracy of the input active current of the power unit of the unit-serial type high-voltage frequency converter, including a main control board 100 and a power unit control board 200, wherein:

[0074] The power unit control board 200 includes a logic controller 201 and a digital signal processor 202; the logic controller 201 is connected between the main control board 200 and the digital signal processor 202;

[0075] Specifically, the main control board 100 is used to obtain the grid voltage and the output current of the whole inverter when the unit series high-voltage inverter is running, and send it to the logic controller 201;

[0076] The logic controller 201 is used to obtain the output voltage modulation information of the power unit when the unit series hi...

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Abstract

The present application discloses a method for calculating the input active current of a power unit of a high-voltage frequency converter, which includes: obtaining the operation information of the high-voltage frequency converter connected in series, the operation information including the grid voltage, the output current of the whole machine of the frequency converter and the output of the power unit voltage modulation information; calculate the input voltage of the power unit according to the grid voltage; calculate the output voltage of the power unit according to the output voltage modulation information; calculate the output voltage of the power unit according to the inverter output current, the The input voltage and the output voltage are calculated to obtain the input active current of the power unit, so as to improve the calculation accuracy of the input active current of the power unit. In addition, the present application also discloses a high-voltage frequency converter and its control system.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a calculation method for input active current of a power unit of a high-voltage frequency converter, a high-voltage frequency converter and a control system thereof. Background technique [0002] The power unit of the unit series high-voltage inverter generally adopts a topology structure of three-phase input and single-phase output, such as figure 1 shown. This topology determines that the instantaneous output power of the power unit fluctuates, and the purpose of improving system performance must be achieved by stabilizing the bus voltage of the power unit. At the same time, according to the conservation of active power, it can be known that the input active current of the power unit must also fluctuate accordingly. . [0003] Since the input active current of the power unit fluctuates, when performing PWM (PulseWidth Modulation, Pulse Width Modulation) con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/14
Inventor 钟声李忠锋
Owner SHENZHEN INVT ELECTRIC