Research And Design Of The Controller Of Hybrid Wind/Photovoltaic Generation System

As the world "energy crisis" in the growing, Governments speed up their paces to develop new energy sources. Among these, wind and solar power have attracted a great attention because of their advantages. they are applied widely and successfully, and become a focus of the research. It is not only reduced the costs of a single PV power generation system or a single wind one, but also greatly improved the stability and reliability of the power supply system due to the fully use of the advantages and natural complementarity of the tow energies in the Wind/Photovoltaic hybrid generation system.In this thesis, we designed a Wind/Photovoltaic hybrid generation controller,24V for the rating voltage and10A for the rating current, and it will be used for DC load. In order to knowing more about the characteristics of the photovoltaic cell, we built a simulation module of the photovoltaic cell according to its engineering mathematical model by Matlab. In this thesis we designed a MPPT(maximum power point tracing) function module in the system for the purpose of fully use of the energy, then a simulation model of photovoltaic power generation system with the most common algorithms of MPPT(Perturd&Observe algorithms) was built due to the simulation module of the photovoltaic cell. But at last we adopted the improved method of climbing to realize the function of MPPT, because it is more stable and higher efficiency than P&O algorithms.A MPPT method should be also taken to maximize the wind generator’s output power in principle, but it will increase the cost of the system greatly which is a small power generating system under the power of lkW. In this thesis, stem from the efficient consideration, the output power of the wind generator is being used selectively according to the need of the system. In order to balance the output of the system, the energy storage module (lead-acid battery) was used in it, and then we designed the charging and discharging management and the display function of the battery capacity. In order to improve the charging efficiency of the battery and extend its life, a three-step battery charging strategy has been studied.In this thesis, we designed some protection modules which insure the safe running of the system, such as reverse connection protection of the battery and photovoltaic cell, over-voltage protection of the wind generator, short circuit protection of the load.In addition, in order to better manage the system and increase the amicability of the system and realize the on-line monitoring and measuring function, we designed the function and interface of the upper device. According to the practical needs, the system also involves voltage, current sampling, temperature sampling and data operation. All the functions of control and data operation will be realized by the STC12C5410AD microcontroller. At last, a controller of Wind/Photovoltaic hybrid generation was made. All the tests have been practiced on its capability, and the results show that all the indexes could meet the requirement, and the system works well.