Engineering Design Of A Photovoltaic Grid Connected Power Generation System

Energy as the fundamental key of social development,the influence is very far from all walks of life.with a lot of energy consumption,the adverse effects caused by the earth's environment is becoming more and more prominent,the development and utilization of clean energy has become the consensus of the people,is one of the most widely used solar power conversion by photovoltaic cell.As a new generation of power generation,its power generation efficiency is affected by many factors.In order to achieve efficient and rational use of solar power,we need to study various parts of photovoltaic power generation system in detail.Taking a specific photovoltaic power project in Gansu Province as an example,the design and analysis of photovoltaic power generation and electrical system is carried out in detail.First,according to the general situation of the project and the meteorological data,we analyze the feasibility of building solar photovoltaic power station in this area,and confirm that the construction scale of the power plant is 40 MW.During the selection of PV modules,inverters and bus boxes in photovoltaic power generation system,the performance parameters of different types of devices are determined through comparison.Then,according to the latitude of the project,we determine the tilt angle and the distance between the PV array.The calculated results show that the maximum power generation efficiency can be achieved when the components are arranged at 38 degree obliquity and the 8.5m interval is arranged.According to the component parameters,the design scheme of the array is determined by comparing the design scheme of the square array.The total station design is carried out according to the idea of “block power generation and centralized grid connected”.A total of 32 generating units are set,each 1.25 MW,each generating unit contains 241 series of photovoltaic array series and inverter boost equipment composed of 20 solar cells.The power generation of each generation unit can be inversed in place,and then it will be merged into the power grid after the secondary rise of 110 kV booster station.At the same time,the station power system and reactive power compensation device were designed,and the main equipments of the electrical system were selected.The overvoltage protection measures,grounding network design,system lighting and cable laying scheme were introduced.Aiming at the important equipments in the power generation system,the corresponding relay protection devices are equipped,and the operation status of each device is monitored in real time by monitoring system and dispatching automation system in the field area,so as to ensure the safe and stable operation of the whole station.Finally,the power generation and 25 year average generation capacity of the PV power plant in the first year is calculated through simulation.After analysis,the energy saving and emission reduction of the power plant is remarkable,and the economic benefit of the power plant is obvious during operation.