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Method for controlling parallel operation of current transformer

A control method and converter technology, which is applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems that the converter cannot share the current, the load voltage adjustment rate increases, etc.

Inactive Publication Date: 2008-12-03
ABLEREX ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the droop control method omits the mutual transmission of current distribution signals between the converters, there are disadvantages such as the inability to equalize the current of each converter and increase the load voltage regulation rate.

Method used

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  • Method for controlling parallel operation of current transformer
  • Method for controlling parallel operation of current transformer
  • Method for controlling parallel operation of current transformer

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Embodiment Construction

[0032] figure 1 It discloses a schematic diagram of the structure of the parallel operation of the converters of the preferred embodiment of the present invention; FIG. 2 discloses a schematic diagram of the control block of the control method of the parallel operation of the converters of the preferred embodiment of the present invention.

[0033] Please refer to figure 1 As shown, N converters operate in parallel, and each converter has a DC power supply connected to its DC input terminal, and a low-pass filter composed of an inductor and a capacitor is connected to its output terminal to filter out the power electronics of the converter. Switching elements switch harmonics at high frequency, and all converter outputs are operated in parallel after being passed through a low-pass filter and sent to a load for use.

[0034] Please refer to FIG. 2 , the output current Iinv and the load voltage Vac are sampled from the converters for the control method of the parallel operatio...

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Abstract

This invention discloses a control method for current transformer parallel operation in which, its control loop includes a voltage feed-back circuit and a current supply circuit and the said first one includes a regulation control circuit and a wave control circuit, the said regulation control circuit provides a load voltage amplitude at a certain value, the wave control circuit improves the general harmonic distortion rate of the output voltage, the said current supply circuit takes out the output current of the transformer to divide it into a basic wave and harmonic wave then to be amplified and the basic wave is taken as the damp between the current transformers and the amplified harmonic as the damp of the output filter.

Description

technical field [0001] The invention relates to a control method of a converter, in particular to a control method for the parallel operation of the converters, so as to reduce the circulating current among the converters and reduce the total harmonic distortion rate of the output voltage under nonlinear load. Background technique [0002] In order to provide high-capacity and high-quality AC power, a single large-capacity converter (inverter) or multiple small-capacity converters can be connected in parallel. Considering the scalability and reliability of the system, the parallel operation of multiple small-capacity converters is better than the single operation of a single large-capacity converter. [0003] However, the main problem of parallel operation of converters lies in the distribution of load current. Overloading of individual converters caused by uneven distribution of load current should be avoided; Losses increase, reducing overall converter efficiency and poss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 张耀仁吴晋昌周宏亮沈南英
Owner ABLEREX ELECTRONICS CO LTD
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