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Single-stage isolated PFC (power factor correction) converter direct-current control system and control method based on DAB (dual active bridge)

A technology of current control and converter, which is applied in the control/regulation system, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc., which can solve the problems of increasing the difficulty of the control system and reducing the system bandwidth. , achieve the effect of reducing cost, improving stability and rapidity

Active Publication Date: 2019-02-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current inner loop will reduce the bandwidth of the system and increase the difficulty of control system design
Therefore, how to reasonably control the DAB converter to make the input current sinusoidal, so as to realize direct control of the input current, has become a major challenge for the new generation of isolated PFC converters in the direction of high frequency and high power density.

Method used

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  • Single-stage isolated PFC (power factor correction) converter direct-current control system and control method based on DAB (dual active bridge)
  • Single-stage isolated PFC (power factor correction) converter direct-current control system and control method based on DAB (dual active bridge)
  • Single-stage isolated PFC (power factor correction) converter direct-current control system and control method based on DAB (dual active bridge)

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Embodiment 1

[0044] see image 3 , is a specific example of the present invention. Its main parameters are as follows:

[0045] ●Input voltage

[0046] ●Output reference voltage V ref = 400V;

[0047] ●Switching frequency f s = 50kHz;

[0048] ●Inductance L=40uH;

[0049] ●Transformer turns ratio N:1=0.59:1;

[0050] ●EMI filter parameter L di =50uH;L fi =50uH;R di = 5Ω; C i =7uF; C o = 1mF;

[0051] ●With resistive load.

[0052] Figure 4 are the output voltage and output current waveforms of the AC power supply, as shown in the figure, the direct current control method of the present invention is used to make the output current waveform of the power supply track the voltage waveform, thereby realizing power factor correction. At this moment, the power factor PF of the converter is 0.995, and the input current THD is 2.5%.

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Abstract

The invention discloses a single-stage isolated PFC (power factor correction) converter direct-current control system and control method based on a DAB (dual active bridge). The original edge whole bridge inside phase shift ratio, the secondary edge whole bridge inside phase shift ratio and the phase shift ratio between original secondary edges of a DAB converter are coordinated, an additional current controller is omitted when inputted current is controlled, sine inputted current can be achieved by directly coordinating an outputted voltage controller, inputted voltage and current modulation,so that the cost of the system and the design difficulty of the controller are reduced, the stability of the control system is improved, and dynamic performance is improved.

Description

technical field [0001] The invention relates to power conversion, in particular to a direct current control system and control method of a single-stage isolated PFC converter based on a bidirectional active bridge converter (hereinafter referred to as a DAB converter). Background technique [0002] With the development of power electronics technology, high-frequency isolated power conversion will be more and more applied to the power grid, becoming an important means to realize fast and flexible control in the power grid. However, the wide application of power electronic devices in AC / DC occasions increases the harmonic content of the grid current and seriously endangers the normal operation of the grid. In order to reduce the harmonic pollution caused by power electronic devices and improve the power quality of the power grid, the International Electrotechnical Commission promulgated and revised IEC61000-3-2, IEC555-2 and other harmonic standards, and the harmonics required...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/4258H02M3/33584H02M3/33592H02M3/3382H02M3/33515Y02B70/10H02M1/0003H02M1/425H02M7/219
Inventor 李国杰童安平杭丽君
Owner SHANGHAI JIAO TONG UNIV
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