Both-way DC-DC convertor control method based on transition process arrangement

A converter control, transition process technology, applied in adaptive control, general control system, control/regulation system, etc., can solve problems such as weak controller robustness

Inactive Publication Date: 2017-08-18
SOUTHEAST UNIV
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  • Description
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Problems solved by technology

The common control method of bidirectional DC-DC converter is double closed-loop PID control, but it often leads to weak robust

Method used

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  • Both-way DC-DC convertor control method based on transition process arrangement
  • Both-way DC-DC convertor control method based on transition process arrangement
  • Both-way DC-DC convertor control method based on transition process arrangement

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[0020] The technical scheme of the present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Such as figure 1 Shown is the block diagram of the bidirectional DC-DC converter, where U dc Is the output voltage of the bidirectional DC-DC converter, I d Charge and discharge current for lithium battery. According to the different control objects of the bidirectional DC-DC converter under different working conditions, a dual closed-loop control strategy is adopted. The outer loop 1 controls the output voltage, and the inner loop 2 controls the charge and discharge current. As shown in the dashed box, 3 is a bidirectional DC- DC converter output direction option.

[0022] Using system identification non-parametric modeling to describe the dynamic characteristics of the bidirectional DC-DC converter, the step response characteristic curve of the converter running under certain excitation conditions is approximately equivalent to a linear...

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Abstract

The present invention discloses a both-way DC-DC convertor control method based on transition process arrangement. The method comprises: employing a system identification nonparametric modeling description both-way DC-DC converter dynamic features to allow the step response feature carve of a converter to be equivalent to a linear second-order model, and calculating system parameters required for identification; employing backward difference approximation of differential terms and integral terms in an original PID controller difference equation, arranging a transition process; and employing the accelerated speed function of the transition process of the both-way DC-DC converter, and finally obtaining an arranged process function. On the basis of obtaining a converter second-order linear model transfer function through adoption of the identification method, the both-way DC-DC convertor control method based on the transition process arrangement employs the PID controller of arrangement of the transition process to control the DC-DC convertor, and the arrangement of the transition process can eliminate overshoot of output voltage and current in the initial operation stage of the converter to solve the contradictory problem between the system overshoot and the transient time to a certain extent, take the time reaching stability as control standard and realize that the system reaches a stable state without overshoot.

Description

technical field [0001] The invention relates to a bidirectional DC-DC converter control method, in particular to a bidirectional DC-DC converter control method based on arranging transition process. Background technique [0002] With the rapid development of the new energy industry, the importance of energy storage systems has become increasingly significant. As a key part of the energy storage system, the bidirectional DC-DC converter provides guarantee for the safe operation of the system, and its control method is extremely important in the process of electric energy storage. The common control method of bidirectional DC-DC converter is double closed-loop PID control, but it often leads to weak robustness of the controller, and there is a contradiction between the overshoot of the energy storage system and the adjustment time. [0003] The DC-DC converter is a key component of the energy storage system, and there are many types of topologies. In order to ensure the norm...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 金龙韦星潘鹏潘非非戴德嵩
Owner SOUTHEAST UNIV
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