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A control method and system for realizing current stress optimization and multi-objective decoupling

A technology of current stress and control method, applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve problems such as the difficulty of DC transformer control, reduce industrial costs and time, improve operating efficiency, and achieve mutual decoupling Effect

Active Publication Date: 2022-03-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, there is a strong coupling between these control objectives, which brings many difficulties to the control of DC transformers.

Method used

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  • A control method and system for realizing current stress optimization and multi-objective decoupling
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  • A control method and system for realizing current stress optimization and multi-objective decoupling

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0034] In the present invention, the terms "first", "second" and the like (if any) in the present invention and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0035] figure 1 It is a flowchart of a control method for realizing current stress optimization and multi-objective decoupling provided by an embodiment of the pr...

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Abstract

The invention discloses a control method and system for realizing current stress optimization and multi-objective decoupling, and belongs to the field of DC converter control. The method includes: converting a coefficient matrix in a small signal model matrix expression into a diagonal matrix and a conversion matrix to decouple the control of the input voltage of each DAB module and the control of the output voltage of the DC transformer; respectively perform output voltage stabilization control and input voltage equalization control of each DAB module according to the control relation in the matrix expression after decoupling; Calculate the optimal intra-bridge phase shift angle and optimal inter-bridge phase shift angle of each DAB module when the current stress of each DAB module is minimized and the transmission power is the standard unit transmission power, so as to control the intra-bridge phase shift of each DAB module angle and phase shift angle between bridges. The control method realizes the precise control of the output voltage of the DC transformer, the balanced control of the input voltage of each DAB module, and the minimization of the current stress of each DAB module. The mutual decoupling among the three control objectives improves the operating efficiency of the transformer.

Description

technical field [0001] The invention belongs to the field of DC converter control, and more specifically relates to a control method and system for realizing current stress optimization and multi-objective decoupling. Background technique [0002] With the development of smart grid, the flexible access of distributed energy and energy storage systems has become an important goal of smart grid. The DC distribution network can effectively solve the problems of efficient utilization of distributed energy and flexible access to energy storage systems, gradually replacing the traditional AC distribution network. The DC solid-state transformer is the core device of the DC distribution network, and the transformation and distribution of electric energy are realized through the power electronic converter. High-performance DC converters are of great significance to the development of DC distribution networks. DC conversion technology is the key technology of DC solid-state transfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/32
CPCH02M3/33576H02M3/33584H02M1/32
Inventor 张宇胡燕陈杨帆
Owner HUAZHONG UNIV OF SCI & TECH
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