三電平超級電容儲能變流器的直接電流控制策略的研究
[Abstract]:With the rapid development of economy, people pay more and more attention to the problem of energy saving and environmental protection. Supercapacitors are widely used in urban rail, electric vehicle, lifting system and power system because of their advantages such as large capacity, high power density, rapid charge and discharge, high efficiency, long cycle life, no pollution and so on. The main contents of this paper are as follows: firstly, the principle of the three-level converter is described. The relationship between the input and output voltage and the continuous and intermittent critical inductance is derived in different operation modes. The relationship between the current ripple and duty cycle of the three-level super capacitor energy storage converter is drawn and compared with the two-level bi-directional converter. Secondly, the effect of switching vector on DC neutral point potential of three-level bi-directional DC-DC converter is analyzed, and the three-level bi-directional DC-DC converter controlled by interleaving is simulated. Aiming at the problem that the neutral point potential of DC side can not be adjusted in real time, the effect of switching vector of three-level converter in Boost and Buck mode on inductance current is analyzed. In this paper, direct current control is used to control the charge and discharge of a three-level super capacitor energy storage converter. The three-level redundant switching vector is used to adjust the DC neutral point potential in real time. The model of three level bidirectional DC-DC super capacitor energy storage converter is built by using PSIM simulation software, and the correctness of this algorithm is verified. The method is simple in structure, quick in response and good in balancing the midpoint potential of DC side. Finally, a three-level bidirectional DC-DC super capacitor energy storage converter with TMS320F28335 as the control core is built, and the related algorithm experiment is completed.
【學位授予單位】:西安理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM46
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