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53-55 Design of Large Centralized Grid - Connected Solar Power Station

Author: Source: Datetime: 2016-12-26 09:46:19
Large-scale centralized grid-connected PV power plants, installed capacity is generally in the tens of megawatt-class and even more than Jiwa class. Figure 4-1 shows the Golmud 200MWp large-scale grid-connected photovoltaic power plant aerial view of China Yellow River Hydropower Company on October 29, 2012. With the rapid development of photovoltaic power generation technology in recent years, the cost continued to decline, greater capacity, large-scale desert and the grid, the power plant is also planning to build. Figure 4-2 shows the schematic diagram of grid-connected PV power plant with large-scale desertification. It shows the characteristics of photovoltaic power generation module structure: large-scale and super-large PV power plant of the same scale as conventional power generation and nuclear power generation can be built, Can also be small to households with roof photovoltaic power supply.

200MWp large-scale grid-connected photovoltaic power station

Figure 4-1 Bird's eye view of the 200MWp large-scale grid-connected photovoltaic power station of the China Yellow River Hydropower Company
Schematic diagram of grid-connected PV power station for GWA-scale super-scale desertification
Figure 4-2 Schematic diagram of grid-connected PV power station for GWA-scale super-scale desertification

The construction of large-scale, large-scale grid-connected PV power station, the initial one-time investment, especially solar panels and grid-connected inverter and other hardware equipment investment is the largest, so before the program and technology design is particularly important. To know that each decision made in the design of photovoltaic power generation system will affect the system cost and cost of electricity, inappropriate choice will make PV power plant investment costs increase a lot, or that the investment benefits greatly reduced. Therefore, master the correct design methods, matching the appropriate hardware equipment must be done.

Strictly speaking, the factors affecting the on-grid electricity price include the local solar energy resources, the efficiency and power generation of photovoltaic power generation system, the reliability and the quality of the grid, the initial investment scale, operation and maintenance costs, loan ratio, interest rate, taxation and profit level. condition. Among them, the local solar energy resources, system efficiency and the initial investment scale are the main factors affecting the electricity price. In the government concession bidding benchmark pricing policy and the subsequent grid electricity price subsidy policy, driven by large-scale photovoltaic power station in western China ushered in a period of rapid development, but with the photovoltaic power generation costs continue to decline and develop the domestic market needs to gold Solar engineering as the representative of the roof grid-connected photovoltaic power station (or power) or will become mainstream. However, in the current cost of photovoltaic power is still higher than conventional power case, through the scale of the ground PV power plant than the roof of photovoltaic power plants, its economy is still slightly better - chips.

Construction of large-scale centralized grid-connected PV power plant, first of all to do the project pre-production, including power plant site, site visits, data bribes collected and arranged, and in this base for the overall design and feasibility study.

Large, large-scale centralized grid-connected PV power station built in the open desert areas, such as the Gobi Desert, beach islands and barren hills and barren crops should not grow, but solar energy resources due to access to public power grid, so in addition to master the area Solar energy resource data, meteorological data, hydrogeological data and surrounding environment, etc., on-site inspection, the investigation of the local power system status, power supply needs and development planning is also necessary.

For large-scale centralized grid-connected photovoltaic power plant project application documents and feasibility study report, in addition to the national project application report to meet the requirements of the contents of the general text: reporting units and project profiles; development planning, industrial policy and industry access analysis; Development and comprehensive utilization analysis; analysis of energy-saving schemes; land use, land acquisition, etc .; environmental and ecological impact analysis; safe operation and economic and social analysis, should also include the overall technical program content of the proposed PV power station, . To this end, in the pre-site research phase, to obtain the following information and data.

(1)) site of the natural environment and traffic profiles

① geographical overview (longitude, latitude, etc.);

② traffic conditions (land, sea, aviation, etc.);

③ natural environment.

(2) meteorological data at the site

The average monthly temperature; the average monthly minimum temperature; the freezing period; the average temperature; the average monthly temperature;

② wind conditions: over the years the dominant wind direction; over the years the maximum wind speed; over the years the average wind speed; more than 8 wind years, the least number;

③ rainfall: the average precipitation over the years; maximum precipitation over the years; calendar years the longest number of days of rain; calendar years of continuous rainfall days;

④ the average fog; over the years the most foggy days; over the years at least fog date; over the years the average fog, said;

⑤ relative humidity: calendar year minimum relative humidity; over the years the average relative humidity;

⑥ snow: the average snowfall over the years; the largest snowfall over the years;

⑦ extreme weather: typhoons, hail and so on.

(3) construction site conditions

① Hydrometeorology;

② topography;

③ engineering geology.

(4) the location of the site of solar energy resources

① the total solar radiation in the horizontal plane, the monthly average data;

② the total amount of radiation;

③ average annual use (monthly use) sunshine hours.

(5) The present situation and existing problems of power system in the area where the site is located

① power system status;

② existent problems;

③ electricity demand and development planning.

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