Modeling And Grid-Connected Analysis Of Photovoltaic System Based On The PSASP

Solar energy for its wide distribution, inexhaustible, clean and safe, etc., is becoming a new generation of renewable energy. The photovoltaic technology is one of the most promising use of solar energy technology. Now, the large-scale photovoltaic power plants are connected to the grid, to analyze the impact of the plants gets more and more attention, but, because current domestic network analysis software lacks for the PV model. it is urgent to develop the PV model according to the program needs to facilitate understanding the operational characteristics of power system for researchers and operating personnel.it can provide better reference for the photovoltaic power plants connected to grid.In this paper, based on the UD modules of power system analysis software (PSASP6.28), the model of single-stage photovoltaic power generation and two-stage photovoltaic power generation was constructed,in which the model of photovoltaic cells, power converter, booster, maximum DC Power control and protection of the grid were set up, through their combination of complete connection between the single-stage model and the two-stage model of photovoltaic power generation, the model of photovoltaic power generation was added to program.Through the debugging and verification for simulation model in the case of static,dynamic and network failure in Single machine infinite bus system,it can reflect the actual operation of the photovoltaic system when connected to the grid, the simulation results proved accurate, the model is facilitate and reasonable and can be used in photovoltaic engineering simulation.The influence between the photovoltaic system and the power system is analyzed in detail through static and dynamic methods. The main contents are as follows:(1) Steady-state power flow analysis of the interconnected system in practical operating conditions; (2) Power system dynamic response with sunshine variations; (3) Influence of the photovoltaic system and the power system in the case of network failure; (4) Suggestions and rules of practical system operation.