A Secondary Ripple Suppression Method of Single-phase PET Post-stage DC-DC Converter
A technology of DC-DC and secondary ripple, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electric variables, etc., and can solve the problem that the power of isolated bidirectional DC-DC converters cannot The voltage contains secondary ripples, low-frequency voltage ripples with large amplitude, etc., to achieve the effect of reducing the capacitance value, reducing the impact on the load, and relaxing constraints
Active Publication Date: 2021-02-26
CHENGDU GUOJIA ELECTRICAL ENG CO LTD
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Problems solved by technology
[0003] Since the single-phase rectifier circuit will generate AC fluctuating power twice the frequency of the grid-side voltage, this fluctuating power will cause secondary voltage ripples on the DC output side of the single-phase AC-DC converter. In traditional control, the isolated bidirectional DC-DC The power of the converter cannot fluctuate inversely with the amplitude of the input voltage, causing the output voltage to also contain secondary ripples
The large amplitude of DC-DC output low-frequency voltage ripple will have adverse effects on the power quality output by the converter, system stability and converter components
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[0038] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the implementations shown and described in the drawings are only exemplary, intended to explain the principle and spirit of the present invention, rather than limit the scope of the present invention.
[0039] The control principle of the isolated DC-DC controller is to control the phase shift angle between the midpoint voltage of the primary and secondary side bridge arms of the isolated DC-DC converter The duty cycle of the midpoint voltage of the primary side bridge arm D 1 and secondary arm midpoint voltage duty cycle D 2 , so that the output voltage of the DC-DC converter is flat under the condition that the input voltage obviously contains secondary ripples. Since the control signal of the isolated DC-DC converter is given by the voltage feedback on the output side after being adjusted by the controller, and th...
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The invention discloses a secondary ripple suppression method of a single-phase PET post-stage DC-DC converter, which uses the phase information θ of the secondary voltage ripple on the input side of the isolated DC-DC converter 2 The feedback control system of the converter is introduced in real time, and the corresponding control parameters are obtained after calculation. By controlling the phase shift angle between the midpoint voltage of the primary and secondary side bridge arms of the isolated DC-DC converter, the primary side is obtained through the modulation module. Bridge arm midpoint voltage duty ratio D 1 and secondary arm midpoint voltage duty cycle D 2 , so that the secondary voltage ripple on the output side of the isolated DC-DC converter is reduced, the power quality and system stability output by the converter are greatly improved, and the adverse effects on the devices in the converter are reduced.
Description
technical field [0001] The invention belongs to the technical field of electrical control, and in particular relates to the design of a secondary ripple suppression method for a single-phase PET post-stage DC-DC converter. Background technique [0002] Currently, AC-DC-DC converters (Power Electronic Transformer, PET) are widely used in charging stations and isolated AC-DC converters. The isolated bidirectional DC-DC converter is used as the post-stage of the AC-DC converter, and its input and output are both DC. This kind of converter also has the characteristics of wide input and output voltage range, input and output electrical isolation, and easy soft switching. [0003] Since the single-phase rectifier circuit will generate AC fluctuating power twice the frequency of the grid-side voltage, this fluctuating power will cause secondary voltage ripples on the DC output side of the single-phase AC-DC converter. In traditional control, the isolated bidirectional DC-DC The po...
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IPC IPC(8): H02M3/335H02M1/08H02M1/14H02M1/15
CPCH02M1/08H02M1/14H02M1/15H02M3/33584H02M1/0025
Inventor 舒泽亮王天翔孟令辉李若愚何晓琼
Owner CHENGDU GUOJIA ELECTRICAL ENG CO LTD