What is the preliminary work of building a large scale centralized grid connected photovoltaic power station?
Introduced earlier Composition and configuration of photovoltaic system. Solar photovoltaic power generation systems are classified according to their system composition and load types. They are usually divided into two categories: independent operation and grid connected operation.Next, we will introduce the preliminary work of building a large scale centralized grid connected photovoltaic power station..
To build a large scale centralized grid connected photovoltaic power station, we must first do the preliminary work of the project, including site selection, site inspection, collection and sorting of relevant data, etc., and on this basis, conduct overall design and feasibility studies.
Large scale and super large centralized grid connected photovoltaic power stations are mostly built in open desert areas, such as the Gobi Desert, tidal flat islands, and barren hills, where crops are not suitable for growth but are rich in solar energy resources. Due to the need to connect to the public grid, in addition to mastering the solar resource data, meteorological data, hydrogeological data and surrounding environment in the area, it is also necessary to conduct on-site inspections and research on the current status of the local power system, power supply requirements and development plans.
For large scale centralized grid connected photovoltaic power station application documents and feasibility study reports, in addition to content that meets the general text requirements of the national project application report: application unit and project overview; development planning, industrial policy and industry access analysis; resources Development and comprehensive utilization analysis; energy saving plan analysis: land use, land acquisition, etc.; environmental and ecological impact analysis: safe operation and economic and social benefit analysis, etc., should also include the overall technical plan content of the proposed photovoltaic power station, namely the initial design . For this reason, the following relevant information and data should be obtained during the preliminary site selection research stage.
(1) The natural environment and traffic profile of the station site
① Geographical overview (longitude, latitude, etc.).
②Traffic conditions (land, water, aviation, etc.).
(2) Meteorological data of the site
①Temperature: The highest temperature over the years, the lowest temperature over the years, the annual average temperature, the monthly average temperature, the monthly average maximum temperature, the monthly average minimum temperature, and the freezing period.
②Wind conditions: the dominant wind direction over the years, the maximum wind speed over the years, the average wind speed over the years, the number of days with the most wind and the least number of winds greater than 8 in a year.
③Rainfall: the average precipitation over the years, the maximum precipitation over the years, the longest rainy days in the past years, the number of consecutive rainy days in the past years, and the rainfall period.
④Air pressure and business conditions: average atmospheric pressure, average water pressure, fog conditions, the most foggy days in the past years, the least foggy days in the past years, and the average foggy days in the past years.
⑤Relative humidity: the minimum relative humidity over the years, the average relative humidity over the years.
⑥Snowfall: Average snowfall over the years, maximum snowfall over the years, extreme weather in the west, typhoons, hail, etc.
(3) Construction conditions of the site
① Hydrology and meteorology.
②Four topography and landforms.
(4) Solar energy resources at the site
①Total solar radiation on half of the water, monthly average data.
②Total radiation on the inclined surface.
③The average annual utilization (monthly utilization) sunshine hours.
(5) Current status and existing problems of the power system in the area where the site is located
① Current status of the power system.
②There is a problem.
③Power demand and development plan.
The above is the preliminary work of building a large scale centralized grid connected photovoltaic power station.