Carrier phase-shifting controller based on multi-winding transformer

A multi-winding transformer and carrier phase shifting technology, which is applied in the application field of power electronic converter technology, can solve the problems of uneven current and uneven voltage of power modules, and achieve the effects of improving device efficiency, reducing switching frequency and simple control method.

Active Publication Date: 2015-05-20
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art, and to provide a carrier phase shift controller based on a multi-winding transformer, which can solve the problem of uneven voltage and uneven flow problem

Method used

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  • Carrier phase-shifting controller based on multi-winding transformer
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  • Carrier phase-shifting controller based on multi-winding transformer

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] like figure 2 As shown, a multi-winding transformer-based converter applied to DC transmission, the AC interface (4) is connected to the AC grid, the DC interface (5) is connected to the DC grid, and the power module (6) is connected to the secondary winding of the multi-winding connected, the power module uses a single inductor filter.

[0026] like figure 1 As shown, a carrier phase-shift controller based on a multi-winding transformer includes: a main controller, a current sharing controller, and a carrier phase-shift modulator.

[0027] The main controller is used to generate the modulation wave Ur according to the control instruction Ord;

[0028] Current sharing controller: It is composed of a proportional control module, a subtraction module, a proportional integral controller, and a multiplier in series. The modulation wa...

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Abstract

The invention discloses a carrier phase-shifting controller based on a multi-winding transformer. The carrier phase-shifting controller comprises a carrier phase-shifting modulator (2), wherein carrier Uci amplitudes of N power modules (6) are the same, and phases are respectively 0, Ts / M, Ts*2 / M, ..., Ts*(M-1) / M, wherein Ts is a carrier period, a phase-shifting coefficient M is any integer smaller than and equal to N. Modulating waves Uri of the N power modules (6) use carrier Uci to perform SPWM (sinusoidal pulse width modulation), so that PWM (pulse-width modulation) pulses are generated. In order to solve non-current sharing, caused by carrier phase shifting, of power modules (6), a current-sharing controller (3) is introduced. The carrier phase-shifting controller improves equivalent switching frequency of the system by M times (M being a module number of carrier phase shifting), effectively lowers switching frequency, reduces system switching loss and improves device efficiency. Meanwhile, the simple current-sharing controller (3) is adopted to restrain non-current sharing of the power modules.

Description

technical field [0001] The invention belongs to the application field of electric power electronic conversion technology, in particular to a carrier wave phase shift controller of a converter based on a multi-winding transformer. Background technique [0002] At present, the voltage level of the power switching device that can be turned off is only a few thousand volts at most. Using the method of connecting the converter units in series will significantly reduce the requirements of the converter on the voltage and current bearing capacity of the switching device. Connect the DC terminals of low-voltage voltage source converter units in series to realize high-voltage DC output, thereby constructing a high-voltage DC transmission converter suitable for DC transmission applications; connect the AC terminals of low-voltage voltage source converter units to To a multi-winding transformer to achieve electromagnetic isolation and energy input. [0003] The converter with switchin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
CPCH02M7/219H02M7/25
Inventor 连建阳方太勋谢晔源姜田贵刘洪德欧阳有鹏段军朱铭炼
Owner NR ELECTRIC CO LTD
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