Research On The Key Technologies Of Modular Photovoltaic Power Supply

Environmental problems and the energy crisis have forced humankind to start developing new energy sources actively.Solar energy has become one of the most promising new sources of energy because of its cleanliness,accessibility and sustainability.Photovoltaic power generation is the most efficient way to use solar energy.This paper mainly studies the distributed modular photovoltaic power generation technology.Photovoltaic modular power supply can be divided into two types of AC and DC.The DC modular photovoltaic power supply represented by the power optimizer,while AC modular is represented by micro-inverter.Modular photovoltaic power ·supply has the characteristics of low power,distributed,simple function and so on.In a PV system application,there is a large number of PV module installed usually,so the requirements of efficiency and cost are higher.The 1st chapter of this article introduces the application background and development direction of modular power supply,and briefly analyzes and summarizes previous work.In the 2nd chapter,from the perspective of cost optimization of the module power supply,an analog MPPT control design for DC power supply is proposed.The design can realize the full analog control of the DC photovoltaic power generation module to replace the more expensive digital control system and greatly reduce the cost of the module power supply.The 3rd chapter on the basis of the second chapter to improve the simulation method,and extended to the AC power module-micro-inverter system.A feasible design of photovoltaic inverter is proposed theoretically and the simulation is given.Due to limited conditions,no experimental verification is given.Chapter 4 presents a new MPPT method.In view of the fact that MPPT mostly uses P&O and INC method in mainstream PV power control,and these two methods have more or less irreversible defects.This chapter proposes a MPPT method based on Power Control which provides a new idea for MPPT design.In the 5th chapter,based on the actual design of UAV photovoltaic power system,a strategy method to improve the efficiency of the series optimizer system is given from the system design level.The strategy can improve the efficiency of the entire system through reasonable control without optimizing the single-stage efficiency.Finally,the article summarizes the scientific research achievements since the postgraduate life and the research directions in the future.