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Research On Bi-directional DC-DC Converter In The Energy Recovery Of Super-capacitor

Posted on:2016-09-10Degree:MasterType:Thesis
Country:ChinaCandidate:W T MaFull Text:PDF
GTID:2322330482478605Subject:Motor and electrical appliances
Abstract/Summary:PDF Full Text Request
Environmental pollution, depletion of oil resources and other issues are increasing sparked the development of new environmentally friendly energy boom. The super capacitor, as a physical storage model element,has advantages which are high current charge discharging, high power density, long cycle life, no memory effect and so on;It has been widely used in the power system, new energy vehicles, uninterrupted power supply systems, scenery complementary power generation system, industrial control and other fields.Energy storage system composed of super capacitor usually requires bi-directional flow, and the application of bi-directional DC-DC converter can greatly reduce the volume,weight and cost in the system, and it is of an important research value. In this paper,we propose an interleaving magnetic integration of soft switching bi-directional DC-DC converter,through the study of the super capacitor and the various types of bi-directional DC-DC converter topological structures.The bi-directional DC-DC converter can reduce its output current ripple through interleaving and magnetic integration of soft switching technology, improving the dynamic response, reducing switching loss. Aiming at the power flow in the different working modes, analyzing the working mode of interleaving magnetic bidirectional DC-DC converter, deducing the basic equations of stable work, obtaining the steady voltage gain, giving the realization of soft switching condition,which can achieve zero voltage switches (ZVS) conduction.Through the analysis of the relationship between the equivalent inductance output ripple and steady dynamic response and integrated inductance coupling coefficient, giving a design scope; Using the array magnetic coupled inductance, and it presents the design method. Setting the appropriate control objectives for different working modes in composite power, establishing the corresponding modal small signal model to the variable state. Energy management controller is designed based on the polynomial algorithm and its parameters are tuning. We describes composite power bi.directional conversion system hardware circuits and software control processes. Finally, the correctness of the theoretical analysis is confirmed by simulation and experiments.
Keywords/Search Tags:supercapacitor, interleaving and magnetic integration, soft switching, bi-directional DC-DC converter
PDF Full Text Request
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