Closed loop dual-mode reduced-order model prediction control method for Buck type DC-DC converter

A model predictive control, DC-DC technology, applied to conversion equipment without intermediate conversion to AC, DC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of limited application and large amount of calculation

Active Publication Date: 2016-06-01
ZHEJIANG UNIV
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Problems solved by technology

The model predictive control algorithm has the advantage of being able to solve multi-variable optimization problems, so it has been widely used in traditional and complex process industries, but its algorithm itself requires a large number of online rolling optimization calculations, and the amount of calculation is large, which limits the use of the algorithm in Application in fast controlled objects (such as DC-DC converters)

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  • Closed loop dual-mode reduced-order model prediction control method for Buck type DC-DC converter
  • Closed loop dual-mode reduced-order model prediction control method for Buck type DC-DC converter
  • Closed loop dual-mode reduced-order model prediction control method for Buck type DC-DC converter

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Embodiment Construction

[0066] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] The modeling work of the present invention is based on the switching converter working in the CCM mode, obtains the constant frequency dynamic model by the state-space averaging method:

[0068] G o ( S ) = u ^ o ( s ) d ^ ( s ) = [ U i n ...

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Abstract

The invention discloses a closed loop dual-mode reduced-order model prediction control method for a Buck type DC-DC converter. A closed loop dual-mode reduced-order model prediction control algorithm is adopted; a closed loop feedback gain coefficient is introduced in a rolling optimization process so as to ensure the stability of the control system; meanwhile, the dual-mode structure is subjected to order reduction by adopting an SVD decomposition method, so that the overall calculation process is simplified twice in order to reduce the online calculated amount; and in addition, an off-set free idea is adopted in the algorithm implementation process, so that the output can stratify a set point value, and the control for the DC-DC converter is realized.

Description

technical field [0001] The invention belongs to the technical field of DC-DC converter control, and in particular relates to a closed-loop dual-mode reduced-order model predictive control method for a Buck type DC-DC converter. Background technique [0002] The generation of fuel cell electric energy depends on the continuous supply of fuel. Fuel supply fluctuations often lead to unstable or even large-scale fluctuations in the output voltage of fuel cells. In addition, various workloads in real life have different rated operating voltages. , how to match the output voltage of the fuel cell with it is a problem. Therefore, it is very important to design a safe, reliable and efficient DC-DC converter, so that it can raise the voltage of the fuel cell to the DC bus voltage, and then step down the voltage of each step-down circuit to supply power to the load. When the battery input voltage fluctuates, it can still Ensure the stability of the DC bus voltage. [0003] Such as ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
CPCH02M3/07H02M1/0012H02M3/072
Inventor 谢磊刘振李修亮
Owner ZHEJIANG UNIV
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