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Research on High Input Voltage and High Power Bi-directional DC-DC Converter

Author: YaoYuan
Tutor: XieShaoJun
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: bi-directional DC-DC converter regenerative braking energy buck/boost interleaved ZVS input series connected voltage sharing control hybrid current control
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 149
Quote: 4
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Abstract


A bi-directional DC-DC converter for the supercapacitor-based absorption and feedback system of regenerative braking energy in urban mass transit is researched in this thesis. Compared to the general applications, this system has some other significant features, such as, the line input voltage is high, the instantaneous power energy to be deal with is huge and changes quickly, and the voltage range of the supercapacitor is wide. As a result, several specific requests for the converter are proposed: ability of withstanding high voltage stress, fast dynamic response, and wide range of the output voltage.The analysis and design of the high voltage and high power bi-directional converter system are studied firstly. With introducing the selection of the topologies for high voltage and high power conversion applications and comprehensive analysis of several schemes, the modular design approach for the system is proposed. And, the whole power circuit configuration and control strategy for the bi-directional DC-DC converter are also presented.For the single module, a multiphase interleaved Buck/Boost bi-directional DC-DC converter is researched detailed in this paper. The inductor is appropriately designed to satisfy the ZVS for all power devices independent of load conditions. A control scheme adopting voltage regulated on high voltage side and current regulated with voltage limited on the low voltage side is proposed to realize the energy transfer freely in bi-directional. The output filter can be reduced effectively with interleaved control, which may also help to improve the dynamic properties.The key issue of input series connected modular converters is the voltage sharing control of input port. To investigate the necessity of voltage sharing control on high voltage side, the relationship between voltage sharing and power equalizing and the relationship between voltage sharing and current sharing are analyzed in this paper. Based on mathematical method, the voltage sharing control scheme on high voltage side suitable for the input series connected modular bi-directional DC-DC converter is deduced. The simulation and experiment results verify the validity of the control scheme.Finally, In order to improve the dynamical response of the converter, this paper researches on a novel hybrid current control technique. Principle of the control technique is analyzed and design rules for realizing constant switching frequency are explained. By simulation and experimental tests, it is confirmed that hybrid current control technique takes advantages of both conventional linear control technique using pulse width modulation (PWM) and nonlinear hysteresis current control technique. For the situation in which fast dynamitic response is required, such as the absorption of instantaneous energy mentioned in this paper, hybrid current control technology has a significant application value.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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