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Linearization control method of single phase shift modulation DAB converter

A technology of phase-shift modulation and control method, which is applied in the direction of adjusting electrical variables, control/regulation systems, and output power conversion devices, and can solve problems such as deterioration of dynamic characteristics of converters, instability, and reduction of converter stability margins. Achieve the effect of enhancing the ability to resist load disturbance and reference input disturbance

Inactive Publication Date: 2018-10-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] However, for DAB converters, when using SPSM modulation, the system presents nonlinear characteristics
When the load of the converter is reduced or the reference voltage is reduced, the stability margin of the converter will be reduced, which will deteriorate the dynamic characteristics of the converter and bring potential instability factors

Method used

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  • Linearization control method of single phase shift modulation DAB converter
  • Linearization control method of single phase shift modulation DAB converter
  • Linearization control method of single phase shift modulation DAB converter

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0023] see first figure 1 , figure 1 It is a structural diagram of the linearization control system of the DAB converter of the single phase shift modulation of the present invention. As can be seen from the figure, the DAB converter of the present invention consists of a DC voltage source, a primary side single-phase full bridge H 1 , Secondary side single-phase full bridge H 2 , a high-frequency isolation transformer, a high-frequency inductor L and a controller, the primary side single-phase full-bridge H 1 4 fully controlled switching devices S 1 ~S 4 , secondary single-phase full-bridge H 2 Four fully controlled switching devices Q 1 ~Q 4 ; The positive pole of the DC bus of the primary single-phase full bridge is connected to the positive pole of the correspon...

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Abstract

The linearization control method of a single phase shift modulation DAB converter is disclosed. Through adding a linearization unit between a digital PI controller and a DAB converter, the nonlinear characteristic of a single phase shift modulation DAB converter is restrained. In the method, a DAB converter system is approximately set to be a linear system and oscillation caused by load sudden changes or reference input sudden changes is prevented so as to guarantee the global stability of the DAB converter under different loads and different reference voltages. The method has low operationalcomplexity and is easy to realize, the dynamic performance of a converter system can be increased and the disturbance resistance capability of the converter is enhanced.

Description

technical field [0001] The invention relates to DC / DC high-frequency isolation conversion, in particular to a linearization control method of a single phase-shift modulation DAB converter. Background technique [0002] With the development of power electronics technology, high-frequency isolated power conversion technology will be more and more applied to the power grid, becoming an important means to realize fast and flexible control in the power grid. The Dual Active Bridge-Isolated Bidirectional DC / DC Converter (DAB converter for short) based on Phase shift modulation scheme (PSMS) technology has high power density, fast dynamic response, and easy implementation of soft With the advantages of switching and bidirectional flow of power, it is very popular in uninterruptible power supplies, electric vehicles, solid-state transformers and other occasions. The control mode of the common DAB converter is phase-shift control. A voltage square wave with relative phase shift is g...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33576H02M1/0038
Inventor 童安平李国杰
Owner SHANGHAI JIAO TONG UNIV
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