The Design And Research Of Intelligent Household Photovoltaic Power Generation Systems

The solar energy is rich,and is a clean,pollution-free,environmentally friendly new e nergy,it has been favored by many countries.At present,the world are very important to the future development of photovoltaic power generation technology,everyone believed that solar energy will be the most important source of energy in the future energy composition.But there are many factors that restrict the development of photovoltaic power generation technology.The most serious problem is energy efficiency.In addition,in terms of hardware,The PV inverter is the power conversion core of the entire photovoltaic power plant,its quality will directly affect the entire system work on the stability,reliability and security.Therefore,it is of great significance to study the maximum power point tracking(MPPT)technology and photovoltaic inverter control technology.In view of the ordinary household electricity load,this paper mainly studies the maximum power point control,DC/DC inverter,battery charging method and the grid inverter control and other related content.TMS320F28035 is the control core of the whole system.In order to be able to achieve energy storage and grid inverter at the same time,this paper compared and analyzed different grid inverter topology at the first time.Finally,we use two levels of the isolation structure of grid inverter,former level with the help of DC Boost converter,we can realize output voltage booster function and realize MPPT,after level DC/AC part adopts classic full bridge inverter circuit to complete the system of grid inverter function.After analyzing the advantages and disadvantages of the commonly used MPPT algorithm,this paper proposes a new control algorithm based on self-optimizing + PI,The MATLAB simulation shows that the new algorithm can achieve the maximum power point of 280 W in the standard environment,and it is very small to meet the actual needs of the project.In addition,when the environment suddenly changed,In about 0.01 s,the system can return to the new maximum power point in that situation.Compared to the general algorithm,the system's fastness and stability are greatly improved.In battery charging control,this paper use a three-stage charging control strategy,it is also contain the MPPT technology.In the collected data show that the charging voltage can reach about 14.2V to ensure that the battery is fully charged,and the method has a very good charging effect,while the loss of the battery is also small.In this paper,SVPWM-based control technology is used in this paper.A mathematical model of three-phase grid-connected inverter is established.In the model analysis,it is found that there is a coupling phenomenon.After the feedforward decoupling link is added,the SVPWM control technique based on feedforward decoupling can adjust the sinusoidal alternating current with the output voltage amplitude of 380 V,and is in phase with the grid voltage,To achieve a power factor of 1 to meet the grid and inverter operation requirements,and the operation effect is good.Finally,based on the theoretical analysis and simulation analysis,DSP is used as the core of the control system in practical application and the realization scheme of the whole PV system is given.