Research On Application Of PV Remote Monitoring System And Its Maximum Power Point Tracking

With the continuous development of society,the use and consumption of energy is increasing,mankind is facing the energy crisis and environmental crisis and other urgent problems to be solved,so that people continue to find and develop new green energy,and solar energy as a renewable Green clean energy more and more people's attention.Photovoltaic power generation is an important way of using solar energy,through the construction of photovoltaic power plants to convert solar energy into electricity for people to use.As solar photovoltaic power station construction is relatively fragmented,however,is not easy to manage,so research and development of photovoltaic(pv)remote monitoring system for the unification of the photovoltaic power station monitoring and management.In addition,the photovoltaic conversion efficiency problem is also an important factor to influence solar energy utilization,based on the existing photovoltaic cell conversion efficiency improve the output efficiency of photovoltaic cells is also a key Point of the current study,the main research for Maximum Power Point Tracking(MPPT,Maximum Power Point Tracking)control.In this paper,a remote monitoring system based on GPRS network communication is researched and developed for the remote monitoring and maximum power point of photovoltaic power generation system.At the same time,MPPT algorithm is adopted to add MPPT control in the bottom control module of remote monitoring system.The microcontroller controller controls the output duty cycle to drive the MPPT control circuit so that the PV output power reaches the maximum power point(MPP).Firstly,the overall design of the PV remote monitoring system is carried out,and the distributed design structure of the system is divided into two parts: the control module and the transmission module.According to the application requirements,the STM32 microcontroller is used as the controller of the system control module and the transmission module,system is mainly studied the design of hardware circuit and software process implementation,realization of data acquisition,MPPT of photovoltaic system control and data remote transmission,and other functions.Secondly,through the comparison of the commonly used remote communication methods,GPRS wireless communication network is selected to construct the remote communication link of the monitoring system,and the function realization of the GPRS module in the system is introduced in this paper.Then this article focuses on remote monitoring center website design,use ASP.NET to design and build remote monitoring system website,use SQL server database configuration manager for database design and data storage and call.Then,MPPT control algorithm is studied in this paper.First of all,the commonly used several kinds of MPPT algorithm are comparatively analyzed,and then in view of the uneven illumination conditions photovoltaic output P-V curves present multimodal features,this paper uses the global scanning and variable step disturbance observation method of maximum power point tracking control by global scanning location near to the global optimal point,and then through the disturbance variable step length to reduce the disturbance of oscillation near MPP,thus reducing the system energy loss.Finally,this paper builds the system experiment platform to carry on the experiment and the test,respectively,carries on the test to the GPRS communication and the remote monitoring system website.The test results show that the wireless communication link is constructed successfully,which can realize the data transmission between the transmission module and the server side,and the monitoring page can meet the design requirements.