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Power supply mode control method, control device and three-phase variable-frequency power supply

A technology of power supply mode and control device, applied in the field of power supply, can solve the problems of single working mode of three-phase power supply, failure to meet test conditions and test standards, etc., achieve high stability, improve utilization rate, and expand applicable scenarios and fields.

Pending Publication Date: 2017-08-04
POWER SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The working mode of the three-phase power supply in the prior art is single, which cannot meet the new test conditions and test standards

Method used

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  • Power supply mode control method, control device and three-phase variable-frequency power supply
  • Power supply mode control method, control device and three-phase variable-frequency power supply
  • Power supply mode control method, control device and three-phase variable-frequency power supply

Examples

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Embodiment 1

[0038] In one embodiment of the present invention, a power supply mode control method is provided for setting the working mode of a three-phase variable frequency power supply, the method comprising:

[0039] Set the voltage of the three phases as the voltage of one of the single phases, that is, the set value of the single-phase voltage is used as the given value of the three-phase voltage, for example, the set value of the U-phase voltage is simultaneously used as the given value of the U-phase voltage, The given value of V-phase voltage and the given value of W-phase voltage set the frequency of the three phases as the frequency of the single phase, that is, the set value of the single-phase frequency is used as the given value of the three-phase frequency, for example, set U The phase frequency setting value is simultaneously used as the U-phase frequency given value, the V-phase frequency given value and the W-phase frequency given value, and the phase angles of the three ...

Embodiment 2

[0043] The power supply mode control method in Embodiment 1 is realized by relying on the power supply mode control device, see figure 1 , the power supply mode control device includes a first voltage setting module, a first frequency synthesis module, a second voltage setting module, a second frequency synthesis module, a third voltage setting module, a third frequency synthesis module and a controller;

[0044] The controller is used to control the first voltage setting module, the second voltage setting module and / or the third voltage setting module to set the three-phase voltage of the power supply, and control the first frequency synthesis module, the second The frequency synthesis module and / or the third frequency synthesis module sets the three-phase frequency of the power supply.

[0045] When the first frequency synthesis module, the second frequency synthesis module or the third frequency synthesis module sets the frequency of the three phases, the first frequency synt...

Embodiment 3

[0058] In one embodiment of the present invention, a three-phase variable frequency power supply is provided, see image 3 , the main circuit of the three-phase frequency conversion power supply includes 12 IGBTs (Insulated Gate Bipolar Transistor), 3 filter units and 3 isolation transformer units, and each phase of the three-phase frequency conversion power supply is composed of 4 IGBTs to form a full-bridge inverter circuit, the filter unit and the isolation transformer unit are in one-to-one correspondence with the three phases, the main circuit of the three-phase variable frequency power supply uses 12 IGBTs to implement the inverter unit, and each phase is inverted by 4 IGBTs in a full-bridge manner, and each Phase-independent LC filter and independent isolation transformer enable the three-phase power supply to be used as three completely independent single-phase power supplies. The three-phase variable frequency power supply based on this circuit design uses the power s...

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Abstract

The invention discloses a power supply mode control method, control device and three-phase variable-frequency power supply. The control method is used for setting a working mode of a three-phase variable-frequency power supply, and the method includes the following steps: setting the voltages of three phases to be the voltage of a single phase of the three phases, setting the frequencies of the three phases to be the frequency of the single phase, independently setting phase angles of the three phases, and then controlling the power supply to work in a first mode; independently setting the voltages of the three phases, setting the frequencies of the three phases to be the frequency of a single phase of the three phases, independently setting the phase angles of the three phases, and then controlling the power supply to work in a second mode; and independently setting the voltages and frequencies of the three phases, and then controlling the power supply to work in a third mode. The power supply mode control method realizes various usages of the three-phase variable-frequency power supply, can satisfy the requirements of a traditional variable-frequency power supply, and can also simulate various state network voltages, satisfies various test standards, is suitable for a plurality of test industries, and improves the utilization rate of the power supply itself.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a power supply mode control method, a control device and a three-phase variable frequency power supply. Background technique [0002] The output voltage and output frequency of the existing three-phase power supply are the same, the phase angle is fixed at 240° and 120°, the phase angle cannot be adjusted arbitrarily, and the voltage cannot be adjusted independently for each phase. The application field is limited and cannot be applied. In the current new test conditions and test standards. [0003] Corresponding to some power equipment test products, according to the national / industry standards, it is necessary to use a three-phase variable frequency power supply for testing. Once a problem is found, it is necessary to use variable frequency power supplies with different parameters for further testing and analysis. However, it is necessary to purchase one or more variable frequenc...

Claims

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Application Information

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IPC IPC(8): H02M5/32H02M7/5387H02M7/539
CPCH02M5/32H02M7/5387H02M7/539Y02E40/50
Inventor 宋志强
Owner POWER SUZHOU
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