The Engineering Design And System Analysis Of Large Scale Photovoltaic Power Station

In the context of today's worldwide energy crisis,renewable energy has become more and more used due to its pollution-free and reproducible advantages.As an impqrtant part of renewable energy,the photovoltaic grid-connected power generation is of great significance to alleviate China's energy shortage and actualize energy strategic transformation.This paper takes a large-scale grid-connected photovoltaic power plants project in Yulin area as an engineering example,which analyzed and computed the wire schemes,the equipment selections,and the generation capacity calculation in the design process of this photovoltaic power plant.The design of the photovoltaic power generation array and confluence schemes at all levels had completed.The electrical system simulation model and short-circuit current of computing system were built by the ETAP software,which ensured the main selections of the photovoltaic power plant equipment.The PVSYST software is used to estimate the annual power generation in 25-year life cycle of the project.Taking the key issues in the design as the research objects,the research on the maximum power tracking scheme of photovoltaic power station was carried out.After summarizing the research status of MPPT,grid-connected and grounding systems of large-scale photovoltaic power plants,according to the engineering model of silicon solar cells,The MPPT scheme of the photovoltaic panel was compared and simulated.In order to solve the problem of voltage oscillation at the output end caused by the fixed step size of the admittance incremental method,a variable step size scheme was proposed,and the actual effect was verified by simulation.The PSCAD/EMTDC power system simulation analysis software was used to build a three-phase grid-connected photovoltaic power plant equivalent simulation model,which verified the correctness of the simulation model and the dynamic response characteristics of the grid-connected photovoltaic power plant.Combined with the project survey results,the grounding scheme affecting the safety of the power station was analyzed and compared;the grounding scheme applicable to the project was determined also,which completed the design of the entire photovoltaic project.