Design Of Grid-connected Photovoltaic System With The Control Of Improved MPPT And Research On Transient Simulation

Grid-connected PV project promotes the transformation of solar energy from"auxiliary energy" to "alternative energy". To connect to grid, it needs fast and accuratemaximum power point tracking control strategy and reliable grid-connected controltechnology. It needs reliable, economical and flexible design scheme. It also needs toresearch and analyze the transient stability of Grid-connected PV.Firstly, the mathematical model of photovoltaic cell for engineering is set up, then amodified maximum power point tracking control method with a high tracking speed andprecision is adopted. In addition, grid-connected control strategy with the character ofhigh stability and dynamic response speed is studied. Through the simulation ofDIgSILENT/Power Factory, the advantages of the maximum power point trackingmethods and integration control strategy are verified. It provides a theoretical basis fordesigns of grid-connected photovoltaic power engineering.Secondly, combining with the grid-connected photovoltaic power generating projectof Henan college of finance and taxation, the engineering program of510kW photovoltaicpower generating system connected to grid is designed, the detailed design and elaborationfor PV system, the energy storage system and the micro-grid control system areresearched.Finally, the510kW grid-connected photovoltaic power generation project based onthe DIgSILENT/Power Factory simulation software is modeled, then the transientsimulation for load mutation, short-circuit fault and light mutation is made. All kinds ofpower system stability problems after the connection to grid of photovoltaic system arestudied and analyzed. The simulation results provide the feasibility evaluation and analysisfor engineering design, which have engineering application value.