Design and simulation experiment of photovoltaic power generation systems for zero-energy solar houses
[Objective]The construction industry in China,as a major energy consumer,plays a critical role in achieving the nation's"double-carbon"goal.According to the statistics,residential energy consumption is the highest among all types of building energy consumption and is currently the focal point of China's energy-saving and carbon reduction initiatives.Solar energy has significant potential to reduce energy use and carbon emissions in the construction sector owing to its widespread availability,non-polluting nature,and easy integration with buildings.This paper explores the design of a photovoltaic(PV)power generation system for solar-powered residences in Xuzhou,aiming to achieve zero energy consumption for homes throughout the year.The design features passive buildings and low-energy design principles along with advanced PV technology.[Methods]The PV system capacity was determined based on the maximum value of the average daily electricity consumption of houses in Xuzhou.The number and parameters of PV modules were selected accordingly.The main circuits,including DC/DC converters,DC/AC converters,and filters of the PV grid-connected power generation system,were designed.Parameters were calculated by analyzing input/output relationships,voltage/current ripple,filtering characteristics of each part of the circuit,and other constraints to ensure normal and stable operation.Next,appropriate control strategies for each level of the converter were to meet system requirements,such as maximum power tracking,grid current tracking without a static difference,and DC bus voltage stabilization.Parameters were designed based on these control strategies.Finally,to verify the feasibility of the proposed design,a Simulink simulation model of the PV power generation system was constructed,and relevant experiments were conducted.[Results]The experimental results reveal the following:1)The PV grid-connected power generation system operated stably,meeting the target requirements for bus voltage,system output power,and total harmonic distortion of grid-connected current.2)During strong light conditions,the PV system generated sufficient power to meet residential electricity demands and sent excess power back to the grid.Under weak light conditions,the PV system generated insufficient power,supplementing power from the grid.3)Household appliances maintained stable voltage,ensuring normal operation regardless of light intensity.[Conclusion]A two-stage grid-connected PV power generation system was designed for zero-energy solar homes in Xuzhou.The system ensured normal operation of household appliances under both strong and weak light and effectively controlled circuit voltage and current.Additionally,the design process provides a typical interdisciplinary engineering case suitable for conducting comprehensive,advanced,and design-oriented experimental training in undergraduate education.This allows students to acquire relevant practical knowledge about PV systems and cultivate their ability to solve complex engineering practical problems.
zero-energy buildingssolar-powered residencesphotovoltaic power generationsimulation experiments
万方数据
维普
