Electrical Characteristics Analysis Of Renewable Energy Power Generation And Optimal Design Of Hybrid Renewable Energy Power Generation System

With the rapid consumption of fossil fuels such as coal, oil and natural gas, the energy crisis and environmental pollution have become serious threat to economic development and people's health which are intensified day by day. In recent years, countries around the world are seeking and developing a new, clean, safe and renewable energy to satisfy the increasing and urgent demand for energy, especially, the electric power supply. Renewable energy power generation modes include solar, fuel cell and wind power generation. However, solar energy and wind energy have disadvantages of low energy density, poor stability and influenced by weather and environmental factors. In addition, although the fuel cell output is stable, the high cost is also the character of it. Considering each renewable energy power generation mode of the hybrid system can make up from each other's strong points and offset its weakness to keep the system stability and reliability, hybrid renewable energy power generation system will be a major trend of renewable energy development and utilization.Firstly, this thesis described the operation principle, output characteristics and operation forms of solar, fuel cell and wind power generation. Based on the theories, the thesis did the electrical characteristics experiment of renewable energy power generation and the simulation and modeling of the hybrid system.Experiments include the following contents: current-voltage-power relationships of solar cell which is under the constant light intensity; the relationships of photovoltaic array output characteristics and the solar irradiation, module temperature of four seasons based on the data which were collected by the data logger; the relationships of internal voltage rise, internal voltage drop, time constant, load variety during the transient response process of proton exchange membrane fuel cell including the single fuel cell, series-type fuel cell and parallel-type fuel cell.Using HOMER(Hybrid Optimization Model for Electric Renewables) simulation software, it simulated, modeled and compared the input-output conditions of residential hybrid power generation systems consisted of the same types of photovoltaic array, wind generator and fuel cells under the different solar irradiation and wind speed in Gwangju, Korea and Tungchitao, Taiwan, China. The simulation results include economic value evaluation of hybrid system; the hybrid system performance of balance between supply and demand under different meteorological conditions and load demands of different season, weeks and weekends, 24 hours of a day. Furthermore, get the best model of power supply, capacity size, devices quantity and power cost to decide the optimal design of power supply schedule.