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Duty ratio compensation-based bidirectional buck-boost DC converter control method

A technology of a DC converter and a control method, which is applied in the direction of converting DC power input to DC power output, control/regulation system, output power conversion device, etc., can solve the problems of reducing the performance of the converter, large current ripple, etc. The effect of improving power density, good application and development prospects

Pending Publication Date: 2022-08-09
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ripple of this type of converter under the traditional modulation strategy is still large, which will reduce the performance of the converter

Method used

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  • Duty ratio compensation-based bidirectional buck-boost DC converter control method
  • Duty ratio compensation-based bidirectional buck-boost DC converter control method
  • Duty ratio compensation-based bidirectional buck-boost DC converter control method

Examples

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Embodiment Construction

[0060] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0061] like figure 1 As shown, a flying capacitor bidirectional buck-boost DC converter includes: an H-shaped bridge arm, a filter inductor L, and a resistor R L , two flying capacitors C f1 and C f2 , two filter capacitors C 1 and C 2 . The two opposite bridge arms in the H-shaped bridge arm are the first bridge arm and the second bridge arm respectively, and the first bridge arm includes the first to fourth switch tubes S connected in series in sequence 11 -S 14 , the second bridge arm includes the first to fourth switch tubes S connected in series in sequence 21 -S 24 , the connecting bridge arm in the H-shaped bridge arm has a series filter inductance L and resistor R L , since the specific connection mode of the H-type bridge arm switch tube is well known to those skilled in the art, it will not be described in detail here. Flyi...

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Abstract

The invention discloses a bidirectional buck-boost DC converter control method based on duty ratio compensation, and relates to the technical field of power electronics, and the method comprises the steps: when a bidirectional buck-boost DC converter works in a boost mode and a buck mode of a buck-boost mode, on the basis of a conventional phase-shift modulation strategy, a phase-shift modulation strategy is established; and positive compensation is carried out on the duty ratio of a conduction switch tube at the input side of the H-shaped bridge arm, and negative compensation is carried out on the duty ratio of a conduction switch tube at the output side of the H-shaped bridge arm, so that inductive current ripples when the converter works are reduced, and meanwhile, the overall power density of the converter is improved. The method has good application and development prospects for the energy storage link of a new energy distribution power generation system such as light, wind and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method for a bidirectional buck-boost DC converter based on duty cycle compensation. Background technique [0002] Energy storage is an important link in photovoltaic and wind power generation systems. The use of energy storage batteries in conjunction with renewable energy can make renewable energy generation match the power grid demand in terms of time and intensity, and reduce the randomness of renewable energy generation. Reduce the voltage fluctuation of the DC microgrid and improve the quality of power generation. The energy storage medium is usually connected to the high-voltage bus through a bidirectional DC / DC converter, which can realize the bidirectional flow of energy between the energy storage medium and the DC bus, and can realize the control and efficient utilization of energy in the system. [0003] At present, the commonly used bidirectional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/158H02M3/157H02M1/42
CPCH02M1/08H02M3/1582H02M3/157H02M1/42Y02E70/30
Inventor 毕恺韬庄煜刘柳李安龙朱一昕樊启高
Owner JIANGNAN UNIV
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