Two-phase DC-DC Buck Converter In Solar-hydrogen System

Hydrogen burning high calorific value and energy density, the energy conversion process without pollution, is an ideal energy carrier; the same time, solar energy is inexhaustible clean energy for humans, human beings have a more mature way of solar energy conversion, and solar energy conversion system costs are also reduced year by year. The use of solar energy to prepare the hydrogen is a flexible, non-polluting energy storage; of this thesis is intended to constitute a distributed hydrogen production systems with digital power conversion module, photovoltaic power conditioning system design closed-loop to provide proper operating current for the electrolyzerDue to the solar input unstable, and the port voltage can not directly match the electrolyzer, so in a high-performance power conditioning link must exist between the PV and electrolyzer. This system of digital power conversion modules in the system play a photovoltaic power regulation function, the input voltage instability in photovoltaic energy conversion for the stability of output constant current power, to the alkaline electrolyzer;the same time as the light intensity PV output power level, the corresponding supply electrolyzer current level should be adjusted accordingly. This design uses a current feedback digital control, digital control of power converters under the premise of the system voltage information; view of the basic requirements of the system output must be adjustable, the use of digital control technology. The system uses the TI TMS320F2812as the master chip sampling speed, real-time and processing speed to meet the system requirements, and good control of the DC-DC buck converter switch turns on and off.The paper work can be divided into the following steps:First, photovoltaic and hydrogen production technology and principle understanding through literature, followed to determine the structure of the light hydrogen systems, and selected the topology of the power conversion module for two-phase step-down DC converter; Next on the system input power converter, the load modeling, the establishment of small-signal dynamic model, and finally system parameter design and digital implementation, allowing the system to meet the stability and dynamic requirements, and finally verified by experiment to prove the design feasiblesex.