Use of renewable power technology in urban area can help the buildings to minimize the carbon footprint, meet the electricity needs and achieve the nearly zero-energy building. In this study, the design results of the rooftop grid-tied PV power system with the capacity of 56.7kW for a research institute building in Vietnam are analyzed. The study results have calculated the electricity generation, performance of the rooftop grid-tied PV power system as well as reduction potential of the amount of CO 2 emitted into the environment. The design results of the rooftop grid-tied PV power system for a research institute building will be compared with the actual power generation results of an installed rooftop grid-tied PV power system at a building of General Directorate of Energy-Vietnam Ministry of Industry and Trade in the same city.

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At the present, the grid-tied solar power system is the most promising as a renewable energy technology for replacing the fossil energy sources. The usage efficiency of the power conditioner system in the grid-tied solar power system is not high because the electricity generation from solar panels depends on the weather. The utilization rate of the power conditioner system can be increased by adding the small scale wind turbine to the existing grid-tied solar power system. We introduced a novel design solution in the previous study to connect the small wind turbine with the power conditioner system of the grid-tied solar power system by emulating technical characteristics of the solar panel in series connection mode. By which, the utilization rate of the power conditioner system has been increased. However, this improved utilization rate of the power conditioner system is not high in the cloudy and rainy days because the voltage of the solar panel changes slightly and the maximum input voltage of the power conditioner system is limited. Therefore, we propose a novel performance enhancement method for solar-wind hybrid power plant using photovoltaic cell emulating system in this research.

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