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YANG Changye,CHEN Yanfeng,ZHANG Bo,QIU Dongyuan,CHEN Xi.Applications of Chaotic Control Scheme Based on Parameter-perturbation in Buck-Boost Converter[J].JOURNAL OF POWER SUPPLY,2018,16(2):32-37
Applications of Chaotic Control Scheme Based on Parameter-perturbation in Buck-Boost Converter
Received:November 30, 2017  Revised:January 23, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.32
Keywords:Buck-Boost converter  chaotic control  parameter-perturbation method  periodic-1 orbit
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
              
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YANG Changye School of Electric Power, South China University of Technology, Guangzhou , China
CHEN Yanfeng School of Electric Power, South China University of Technology, Guangzhou , China
ZHANG Bo School of Electric Power, South China University of Technology, Guangzhou , China
QIU Dongyuan School of Electric Power, South China University of Technology, Guangzhou , China
CHEN Xi School of Electric Power, South China University of Technology, Guangzhou , China
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Abstract:
      In the distributed DC microgrids, a DC-DC converter(e.g., Buck-Boost converter) is usually selected as the interface converter between the DC bus and the large power grid, such that the output voltage of PV arrays or other energy storage units can be boosted or lowered to match the DC bus voltage. As a system with strong nonlinearity, some unexpect-ed situations such as bifurcation and chaos will occur when the circuit parameters(i.e., input voltage, reference current, etc) of the Buck-Boost converter change, which degrade the performance of the converter or even result in its failure. In this paper, a strobe mapping model is built based on a peak-current mode controlled Buck-Boost converter, and its nonlinear dynamics characteristics are analyzed. Based on the principle of chaotic control of parameter-perturbation, a chaotic control scheme is designed, which can be applied to the peak-current mode controlled Buck-Boost converter. Under this scheme, the converter operating in a chaotic state can quickly return to a periodic state. Meanwhile, the performances of the converter, like its steady-state behavior and ripples of output voltage, can be improved evidently.
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