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63-65 Type Selection of Photovoltaic Piling Foundation

Author: Source: Datetime: 2016-12-27 16:31:33
Through the above wind load, snow load calculation, the general engineering selection of 50 angle and 100 channel steel as a support matrix of solar cell matrix material. Material selection basis:
a.  According to the wind pressure and snow pressure calculation results, as well as the square array of solar cells for selection;
b.  According to the bending deformation formula of material mechanics, the optimal cross-section of connecting parts is calculated, and the selected material and structure mode are determined.
c. Select the anti-rust treatment stent.

As for the rust-preventive treatment, the following measures are generally adopted.
• Hot dip zinc method, when the material thickness is more than 5mm, the coating thickness is more than 86μ, the anticorrosion life of the steel structure is more than 25 years. The thickness of the coating is less than 5mm, and the coating thickness is not less than 65μm.
Coating method of coating material, the coating is generally done 4 to 5 times, the total dry film thickness of 150μm, 125μm indoor engineering, to allow errors of 25μm. Photovoltaic project in the beach beach implementation is in a more corrosive atmosphere, the total dry film thickness to be increased to 200 ~ 220μm.
In areas where sea salt particles are eroded, such as islands and coasts, reinforced concrete support structures may also be considered to prevent corrosion of the support.

 (6) PV array foundation engineering (refer to GB 50010-2002 "concrete structure design planning">
As a solar photovoltaic array based on the role of the load, we must first consider the wind pressure load. Because the array itself is subject to the wind area of the structure, to be considered to be strong winds, collapse, winds and other consequences.
In the coastal areas such as the construction of photovoltaic power plants, the basis of its photovoltaic array, must be able to meet the stability and deformation requirements. The structure of the structure has been discussed in front of the choice of strong wind resistance of structural materials, when subjected to strong winds, the PV array based on the following issues should be considered:
1. By the impact of lateral wind, the foundation may slip or fall;
2. Foundation subsidence (the vertical force exceeds the vertical support force);
3. The foundation itself is destroyed;
4. The air blown into the back of the battery causes the structure to float;
5.The battery side of the wind under the vortex, causing pressure changes, so that the battery to the ground to attract.
As shown in Table 4-6, the infrastructures can be divided into six types.

Table 4-6 The type of infrastructure

Base type

Basic scope of application


Direct foundation

Support layer shallow occasions

Pile foundation

Support the depth of the occasion

Deep foundation pile foundation

Tower and so on the basis of use

Caisson foundation

Load-scale occasions with large (such as the bridge foundation)

Steel pipe sheet pile foundation

Used in the construction of bridges in Hanoi

Continuous basis

The depth of the support layer used in the occasion

 

According to the geological data of PV power station construction address, the stability analysis of the foundation is carried out. In such as coastal beaches, landfills and other places to build photovoltaic power plants, the square matrix should pay attention to geological conditions. At this point the PV array based on the proposed selection of the proposed pile foundation or protruding base of the composite base. The former project costs larger, the latter second, should be based on the actual situation on the spot discretion. Pile foundation is shown in Figure 4-9. A composite foundation is a foundation that is supported by two or more struts. Protrusion of the composite base, is to prevent sliding, increase the basic shear resistance measures (see Figure 4-10)


Figure-4-9-solar--Piling-Foundation

                   Figure-4-9-solar--Piling-Foundation                

Figure-4-10-Composite-base-with-protrusionsFigure-4-11-ground-support-system

Figure-4-11-ground-support-system


Of course, the continuum of integration is also the basis for consideration.
Figure 4-11 is a kind of ground support system called ezRack solar Terrace. The stand system for outdoor open terrain surface of the solar panel mounting system, the unique aluminum track, Z-shaped pieces of cards and caps, you can quickly and easily a number of units Connect to meet the actual requirements of the installation site, low cost, fast installation, good stability, strong wind resistance. The technical parameters are as follows:


Figure-4-12-Type-Selection-of-Photovoltaic-Piling-Foundation

 

Installation Location: Outdoor.

Installation angle: according to requirements.

Installation height: according to requirements.

Wind resistance: 60m / s.

Snow load: 1.4 kN / m2.

Solar PV Module Type: Framed or frameless.

Component arrangement: horizontal or vertical.

Implementation of standards: in line with AS / NZS1170 and other national standards.

Color: natural color.

Figures 4-12 are new ground supports and subterranean structures that do not require cement concrete foundations.

(7) PV automatic tracking technology options

As we all know, in order to improve the photovoltaic power generation capacity, reduce electricity costs, increase the economic benefits of investment, you can use PV automatic tracking technology.

 

From the domestic technology, the non spotlight form has the following 3 tracking technology

Horizontal single axis: the power output increased 10% ~ 20%, the cost increased by 3% ~ 5%, the largest single 50KW (end of 2008).

Tilted single axis (polar axis): power output increased by 20% ~ 30%, the cost is increased by 10%, the largest single 3 3kW (end of 2006).

Biaxial: power generation improving from 30% to 40%, a 15% increase in the cost of a single, maximum power 10KW (end of 2008). ^

Now, of course, some professional organizations or companies have done better. Do you want to track a photovoltaic power plant design, and should vary, entirely by the comprehensive technology economics to determine, from the above 3 kinds of tracking technology, usually oblique single axis tracking effect is good, suitable for horizontal single axis lower latitudes (30 DEG). The square flat plate solar battery, after has slashed prices in solar cell components, generally do not have to choose the dual axis tracking, dual axis tracking often because the reliability is not high, and will bring trouble to the maintenance, the The loss outweighs the gain. Figure 4-14 is the oblique single axis tracking system schematic front view of manually adjustable bracket in the season, without increasing the cost situation, improve the generation capacity of 3% ~ 8%. This aspect of the Profit many, interested readers can access.

Figure-4-13-Slant-single-axis-(polar-axis)

Figure-4-13-Slant-single-axis-(polar-axis) Trace system schematic

The maximum deviation tracking for polar tracking is: ±23.5°

Cos23.5°=0.917,only 8.3%, Annual average deviation: 4%




Figure-4-14-Slant-single-axis-(Polar-axis)-tracking-system-front-view


Figure 4-14    Slant single axis (Polar axis) tracking system    front view

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