Power Dispatch for an Input-Series and Output-Series-Parallel DC/DC Isolated Converter with Wide Input Voltage Range by Particle Swarm Algorithm

• Main Authors: Wei-Han Lin, 林慰翰
• Other Authors: Chung-Ming Young
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/4eq87a

碩士 === 國立臺灣科技大學 === 電機工程系 === 104 === This thesis proposes an input-series and output-series-parallel DC/DC isolated converter, which is suitable for application with wide voltage range, such as wind turbine generator. The proposed structure consists of three phase-shift H-bridge converters with different power ratings and a series-parallel-switching circuit. The input ports of the H-bridge converters are in parallel directly, while the output ports can connect in parallel and/or series through a switching mechanism, which provides nine different configurations of the output ports of the three H-bridges. The level of input voltage and power determine which configuration to select. The series configurations provide high voltage gain for low level of input voltage, while the parallel ones operate under higher voltage and share the power. In this thesis, through the perturbation and observation method to achieve the maximum power point tracking for obtaining the maximum power from the input source. Moreover, this paper investigates the strategy of power dispatch when parallel configuration operating. The efficiency characteristics of the three different-rating H-bridge converters are measured in advance, and an off-line particle swarm algorithm solves the optimal power dispatch to maximize the system efficiency for a certain power range. A DSP-based controller (TMS320F28069) produced by Texas Instruments which executes the necessary progress of the proposed system. For simplicity, three nearly linear distribution equations for each H-bridge converter is established in the digital controller to dispatch suitable power of each converter for maximizing system efficiency under parallel configuration. Finally, this paper establishes a 400V/5kW prototype to verify, measure, and evaluate the proposed system. The proposed system worked well under the input range varying from 45V to 400V. Both simulation and experimental results demonstrate the validity of the proposed converter.