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Multi-mode smooth control method and system for cascaded three-level BUCK-BOOST converter

A smooth control, three-level technology, applied in the field of power electronics, can solve the problems of unbalanced capacitor voltage, discontinuous voltage gain, mode oscillation, etc., to achieve the effect of smoothing voltage gain, improving stability, and balancing voltage stress

Active Publication Date: 2021-06-15
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide a multi-mode smooth control method and system for a cascaded three-level BUCK-BOOST converter to overcome the discontinuous voltage gain caused by the dead time. problem, capacitor voltage imbalance problem, and mode oscillation problem

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  • Multi-mode smooth control method and system for cascaded three-level BUCK-BOOST converter
  • Multi-mode smooth control method and system for cascaded three-level BUCK-BOOST converter
  • Multi-mode smooth control method and system for cascaded three-level BUCK-BOOST converter

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Embodiment Construction

[0067] Figure 4 is the modulation signal d of the cascaded three-level BUCK-BOOST converter when the multi-mode smoothing control method of the present invention is not used 1 and d 2 and working mode. Figure 5 For the voltage gain and the operating mode of the cascaded three-level BUCK-BOOST converter when the multi-mode smoothing control method of the present invention is not used, it can be clearly seen that due to the modulation signal d 1 and d 2 With upper and lower limits, the voltage gain of the circuit in the dead zone is discontinuous.

[0068] In order to overcome the discontinuous voltage gain caused by the dead zone, balance the capacitor voltage and alleviate the mode oscillation phenomenon at the same time, the present invention divides the working state of the cascaded three-level BUCK-BOOST converter into four according to the capacitor voltage difference. modal, and apply the multimodal smooth control method proposed by the present invention in these fo...

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Abstract

The invention discloses a multi-mode smooth control method and system for a cascade type three-level BUCK-BOOST converter. The method and the system are applied to the cascade type three-level BUCK-BOOST converter. Aiming at the inherent dead zone, capacitor voltage imbalance and mode oscillation problems of the cascaded three-level BUCK-BOOST converter, the multi-mode smooth control method provided by the invention is used for controlling the converter, so that the problems can be solved, and smooth change of step-up and step-down is realized.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multi-mode smooth control method and system for a cascaded three-level BUCK-BOOST converter. Background technique [0002] With the increasingly prominent problems of global fossil energy shortage and environmental deterioration, and the rapid progress of new energy power generation technology, the field of distributed power generation has received extensive attention and development. In particular, photovoltaic power generation and hydropower generation have become an indispensable part of the energy structure of countries around the world. However, new energy power generation has strong uncertainties, so in order to facilitate the connection of new energy power generation to the existing power grid, the interface circuit often has a higher and wider voltage and current level. [0003] The traditional two-level DCDC converter has disadvantages such as high voltage s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/06H02M1/14
CPCH02M3/1582H02M3/1584H02M3/06H02M1/14
Inventor 马伏军朱真周思邈林立恒严格非匡德兴黄格林章程
Owner HUNAN UNIV
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