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Method for suppressing DC component in alternating current of bidirectional full-bridge converter

A full-bridge converter, DC component technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., can solve the problems of high-frequency transformer T DC bias, affecting the normal operation of the device, etc. The effect of DC bias

Inactive Publication Date: 2017-04-19
西安奥特迅电力电子技术有限公司
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Problems solved by technology

[0010] The above analysis of the bidirectional full-bridge converter is carried out under stable operation, and the transient analysis can be found in the adjustment lag time D*T hs in the process of i ac A DC component is generated in the middle, and the DC current will cause the DC bias of the high-frequency transformer T, thereby affecting the normal operation of the device

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  • Method for suppressing DC component in alternating current of bidirectional full-bridge converter
  • Method for suppressing DC component in alternating current of bidirectional full-bridge converter
  • Method for suppressing DC component in alternating current of bidirectional full-bridge converter

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[0032] The present invention is described in further detail below in conjunction with accompanying drawing:

[0033] see figure 1 and figure 2 , let the parameter D be D before adjustment and after adjustment respectively 1 and D 2 (D 2 >D 1 >0, that is, the power flows from H-bridge A to H-bridge B and the transmission power increases), then i ac The current at different time points is shown in Equation 3

[0034]

[0035] i ac The DC component in is shown in Equation 4

[0036] i dc = i 1 + i 3 / 2=nV dcB T hs / 2L×(2D 2 -2D 1 ) (4);

[0037] It can be seen from Equation 4 that the DC component is positive at this time, so the DC component can be reduced by increasing the duty cycle of the output voltage of the H-bridge inverter B, so the modulation wave of the H-bridge inverter B is adjusted to 0.5 in the rising half cycle of the carrier wave -(D 2 -D 1 ) / 2, and it is still 0.5 in the falling half cycle of the carrier, at this time i ac The current at d...

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Abstract

The invention discloses a method for suppressing the DC component in the alternating current of a bidirectional full-bridge converter. The DC component is reduced by increasing the duty ratio of the output voltage of an H-bridge inverter B. The modulated wave of the H-bridge inverter B is adjusted to 0.5-(D2-D1) / 2 (D*Ths is defined as the time that the carrier of the inverter B exceeds or lags behind the carrier of an inverter A, and Ths is half the carrier period) in the half rising period of carrier, and is still 0.5 in the half falling period of carrier. The modulated wave of the H-bridge inverter B is adjusted according to the parameter D of two calculation periods, and thus, the DC component in the alternating current of the bidirectional full-bridge converter is suppressed. Therefore, the DC magnetic bias of a high-frequency transformer is eliminated, and safe and stable operation of the converter is realized.

Description

[0001] Technical field: [0002] The invention belongs to the field of electric power and relates to a method for suppressing a DC component in an AC current of a bidirectional full-bridge converter. [0003] Background technique: [0004] Due to the intermittent nature of new energy generation such as solar energy and wind energy, in order to maximize the utilization of new energy and stabilize the energy fluctuations caused by new energy generation, the system needs to be equipped with an energy storage link. The bidirectional DC / DC converter is an indispensable link to realize the bidirectional flow of the DC bus and the energy storage link, while the bidirectional full bridge converter can not only realize the bidirectional flow of energy, but also replace the power frequency transformer with a high frequency transformer to achieve electrical isolation. It reduces the weight and volume of the equipment, improves the power density of the equipment, and adopts the full-bridge...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/36
CPCH02M3/3353H02M1/36
Inventor 李计亮
Owner 西安奥特迅电力电子技术有限公司
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