Research On Small-scale Wind And Solar Complementary Power-generating System

Nowadays energy and environment has become the two important issues facing the world. Mankind is hard to find clean, efficient, renewable energy to replace conventional energy sources such as oil, coal and so on. The development and utilization of renewable energy resources become a basic choice of energy development strategy in the 21st century.The small-sized wind and solar hybrid power generation system is designed to compensate for the deficiencies of conventional electricity generation system. It is the most reasonable and independent power system, such as the most rational allocation of resources,the most reasonable technical proposal and the most reasonable price performance.Reasonable performance can assure a high reliability of the wind and solar hybrid power generation system. Therefore, it has important theoretical significance and practical value to study the technology of wind solar hybrid power generation.In this paper is to wind power system is made as the research object. First of all, the development of wind and solar power generation system status is at home and abroad. The principle of photovoltaic arrays and wind turbine operating characteristics is analyzed.Battery charge and discharge process of electrochemical reaction mechanism and battery charge and discharge control principle is also introduced. These have laid a theoretical foundation for the proposed control strategy and the design of the whole system. Secondly,DC/DC Chopper, the traditional solar, wind maximum power point tracking (MPPT)algorithms and other aspects is discussed and researched. A improved adaptive particle swarm optimization algorithm is proposed. This algorithm can quickly and accurately track the maximum power point, and increase energy efficiency. The DC/DC circuit is designed to achieve MPPT of photovoltaic arrays and wind. Battery charging strategy in this paper adopted three paragraphs charging method that is constant current-constant voltage-float method. The strategy can increase the battery cycle life. Then, parts of the system model for the MATLAB are built and are simulatd by SIMULINK. The simulation results show that the maximum power point tracking control method is practical in this paper. Finally,according to the control strategy of the system, the wind and solar controller based on ATmega8 is designed. It includes solar energy, wind maximum power tracking circuit, the battery charging and discharging control circuit, voltage and current sampling circuit,MOSFET drive circuit, and the auxiliary power supply circuit and so on. The paper also gives the software design flow chart, including the main program of the system, the battery charge and discharge control subroutine, the solar and wind energy maximum power tracking subroutine, etc.. The system hardware and software not only play the advantages of faster computing hardware, but also take use of the advantages of the software easy to use.