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Current stress optimization double-phase-shift control method for double active full-bridge DC-DC converter

A DC-DC, phase shift control technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the problems of slow dynamic response and complex control structure, and achieve fast dynamic response and efficiency. The effect of high and strong practicality

Active Publication Date: 2018-05-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a current stress optimized dual phase shift control of a dual active full bridge DC-DC converter that can solve the problems of slow dynamic response and complex control structure in the existing current stress optimal control algorithm. method

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  • Current stress optimization double-phase-shift control method for double active full-bridge DC-DC converter
  • Current stress optimization double-phase-shift control method for double active full-bridge DC-DC converter
  • Current stress optimization double-phase-shift control method for double active full-bridge DC-DC converter

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Embodiment Construction

[0053] The present invention will be further described in detail below with reference to the drawings and specific embodiments. This embodiment is based on figure 1 The shown topological structure diagram of the dual active full bridge DC-DC converter describes in detail the current stress optimization dual phase shift predictive control method for the dual active full bridge DC-DC converter.

[0054] First, according to the average model of the output voltage of the dual active full-bridge DC-DC converter, the state average space model of the converter output voltage and its state differential equation are constructed.

[0055] Such as figure 2 As shown, when the dual active full-bridge DC-DC converter is under dual phase shift control, the phase shift amount satisfies 0≤D 1 ≤D 2 When the relationship is ≤1, according to the voltage and current waveform diagram of the converter under dual phase shift control, the dual active full-bridge converter at this time has a total of eight...

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Abstract

The invention discloses a current stress optimization double-phase-shift control method for a double active full-bridge DC-DC converter, including the following steps: constructing a state average space equation of the output voltage of a double active full-bridge DC-DC converter according to an average model of the output voltage; discretizing the differential term of the output voltage in the state average space equation of the output voltage to obtain a predicted value of the output voltage of the converter; obtaining the internal phase shift D1 of the converter under a current stress optimization control strategy according to the Lagrange function and a power model of the double active full-bridge DC-DC converter under double-phase-shift control; constructing an evaluation function J according to the predicted output voltage and a reference voltage; and taking the derivative of the evaluation function J to obtain the external phase shift D2 of the double active full-bridge DC-DC converter under a current stress optimization double-phase-shift predictive control strategy. The method of the invention has the advantages of fast dynamic response, high efficiency, simple control process, easy digital realization and the like, and has strong practicability.

Description

Technical field [0001] The invention relates to the technical field of power electronics, in particular to a current stress optimization dual-phase shift control method of a dual-active full-bridge DC-DC converter. Background technique [0002] Dual active full-bridge DC-DC converters are widely used in electric vehicles, photovoltaic power generation, uninterruptible power supplies, energy storage, etc. due to their high power density, electrical isolation, two-way energy flow and easy realization of soft switching. Technical field. [0003] Currently, there are two commonly used control methods for dual active full-bridge DC-DC converters: [0004] Pulse width modulation control, this method is simple and easy to implement, but because the effective value of the full-bridge inverter output AC voltage can only be lower than the input DC voltage, its voltage regulation range is limited. In addition, the dynamic characteristics of the down-converter controlled by this method are poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 宋文胜安峰杨柯欣
Owner SOUTHWEST JIAOTONG UNIV
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