Research On Key Technologies Of Distributed Solar Microgrid Photovoltaic Inverter Power Supply

At present,the world is in the environment of great development,the importance of energy for development is increasingly reflected,but because of the non-renewability of traditional energy such as fossil energy,it is urgent to solve the energy problem and develop clean new energy.Solar energy is not only a renewable energy,but also a clean energy,which is of great help to environmental protection.Therefore,the use of solar power has become an important way to deal with energy issues.Distributed solar micro-grid power generation technology is the main form and direction of solar energy utilization in the future.Based on the design of 20 kW solar photovoltaic power generation system,the related technologies of distributed solar micro-grid power generation are deeply studied in this paper.The characteristics of solar photovoltaic cells and traditional MPPT algorithm are simulated and analyzed.The output characteristics of series photovoltaic cells under uniform illumination and local shadows are analyzed respectively.An intelligent MPPT control method based on particle swarm optimization is proposed for the multi-peak characteristics of series photovoltaic cells.It can still track the maximum power point accurately under local shadows and is more intelligent than ordinary MPPT control method.Based on the traditional three-level SVPWM algorithm,the neutral-point potential balance is considered in the inverter module,and the grid-connected inverter control strategy is improved.The current decoupling control and direct power control are adopted,and the neutral-point potential balance control of single inductor is added to the current decoupling control strategy to suppress the neutral-point potential change.The simulation results are verified by using MATLAB.Completed part of the system hardware design.