| The development of microgrid is a hotspot of the construction in theworld wide electric power grid in the next decade. This dissertation focuses on thewide application of high frequency isolation DCDC convertors. Chapter Onepresents several future applications, particularly for photovoltaic power generationand the development of electric vehicle charging stations for the special attention,proposes a circuit topology of hybrid energy systems, including solar and electricvehicle charging stations combined through high frequency isolation DCDC circuitsfor efficient energy management. It is proposed that the full-bridge topology mostsuitable applications for micro-power grid circuit topology by comparing the varioustypes of high-frequency isolation circuit topology. Chapter Three analyses the circuitcomposed of various aspects of hardware, focusing on the comparison of severalapplicable switches. The voltage and current double closed-loop control algorithm isanalyzed. By the circuit steady-state and transient mathematical model analysis, thereare several issues which affect the regulated output voltage. The first one is the deadtime of high-frequency voltage waveform is increased due to the load currentvibration. The diode reverse recovery issue causes the disturbance of the system,which not only produces a resonant process circuit commutation but also increasesthe dead time. These two issues are non-linear interference factors of the outputvoltage control system. The interference factors will impact on the stability of thesystem in rapid fluctuations in current load conditions. On basic of the analysis of themathematical model, an add robust control algorithm is proposed, in which a voltagecompensation channel is added for compensation of fluctuations caused by thesenonlinear interference. In Chapter Five, experimental prototype platform and thedevelopment of experimental results are displayed, basic experimental prototype hascompleted an efficient power supply with a precise voltage control. |
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