Control method and system for realizing current stress optimization and multi-target decoupling
A technology of current stress and control method, applied in the direction of control/regulating system, electrical components, regulating electrical variables, etc., can solve the problems of difficulty in control of DC transformers, reduce industrial costs and time, simplify control methods, and achieve mutual decoupling Effect
Active Publication Date: 2021-06-04
HUAZHONG UNIV OF SCI & TECH
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However, there is a strong coupling between these control objectives, which brings many difficulties to the control of DC transformers.
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[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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The invention discloses a control method and system for realizing current stress optimization and multi-target decoupling, and belongs to the field of direct current converter control, and the method comprises the steps: converting a coefficient matrix in a small-signal model matrix expression into a product of a diagonal matrix and a conversion matrix, and decoupling the control of the input voltage of each DAB module and the output voltage of the direct current transformer; respectively performing output voltage stabilization control and input voltage sharing control of each DAB module according to a control relational expression in the decoupled matrix expression; and respectively calculating an optimal intra-bridge phase shift angle and an optimal inter-bridge phase shift angle of each DAB module when the current stress of each DAB module is minimum and the transmission power is the per-unit transmission power, so as to control the intra-bridge phase shift angle and the inter-bridge phase shift angle of each DAB module. According to the control method, mutual decoupling among the three control targets of accurate control of the output voltage of the direct-current transformer, balanced control of the input voltage of each DAB module and current stress minimization of each DAB module is realized, and the operation efficiency of the transformer is improved.
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...
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IPC IPC(8): H02M3/335H02M1/32
CPCH02M3/33576H02M3/33584H02M1/32
Inventor 张宇胡燕陈杨帆
Owner HUAZHONG UNIV OF SCI & TECH