Photovoltaic power stations

As the price of photovoltaic power stations continues to decrease, how to improve the return on investment of Pre galvanized z section steel power plants has become a concern of all power station developers, and the refined design of power stations has gradually been put on the agenda. Recently, there have been many articles on the horizontal and vertical arrangement of photovoltaic modules. We have discussed the horizontal and vertical arrangement of components around the issues that everyone cares about.

What are the horizontal and vertical rows of components?

As the name implies, the horizontal row of components means that when the component is mounted on the bracket, the long side is parallel to the east-west direction, and the vertical row of the component means that the short side is parallel to the east-west direction when the component is mounted on the bracket.

The horizontal row of components is more than the vertical row to occupy the ground and the bracket?

1, horizontal row vertical row area comparison

The components line up in the same vertical row. Let’s first talk about land occupation. Some people say that the horizontal row of components is more than the vertical row. Let’s study that the component occupies the ground in a certain inclination condition. The front row components do not block the rear row (usually according to the winter solstice sun 9: 00-15:00 The front row does not block the rear row). Then, as long as the component capacity is constant, the inclination angle is constant, and the horizontal row of the components is as much as the vertical row, which can be calculated by using a simple parallelogram. After the so-called components are horizontally arranged, the brackets become higher and the array spacing is increased. This is only an intermediate visual process, and the actual occupation is almost the same.

We take the 30° inclination angle, 3.0 shadow magnification, 40 components with a size of 1650*992, and the components and components are separated by 0.01 meters as an example. The horizontal row of the components is 4 blocks in the north-south direction and 10 blocks in the east-west direction. The vertical row of the components is 2 blocks in the north-south direction and 20 blocks in the east-west direction.

2, the amount of steel used in horizontal row of vertical brackets

The amount of steel used for the bracket is theoretically the same. The bracket is a structure that fixes the component on the upper side and supports the component’s own weight, wind and snow load, and the like. Under the condition that the wind and snow load in the same area is fixed and the inclination angle of the components is the same, the number of components supported by the bracket is certain, and the amount of steel used for the bracket is the same. In the actual design, the four rows of components in the assembly require 5 beams, and the amount of steel used in the horizontal row may be slightly more, but the amount of the purlins in the north and south directions will be less. After optimization by some experts in the design institute, the components are horizontally and vertically arranged in practical applications. The amount of steel used is almost the same.

3, horizontal row vertical installation difficulty

Horizontal installation is slightly more difficult. After the components are horizontally aligned, the height of the brackets is usually slightly higher than the vertical row, and it is difficult to install four rows of components in the north-south direction. However, with the development of the photovoltaic industry in recent years, the component installation team has become more and more experienced, and various component mounting auxiliary mechanisms have been produced, which can adapt to various bracket heights and forms. The difficulty of bracket installation is not hindering the popularization of components. Constraints.

The cost of component installation accounts for about 1% of the total investment of photovoltaic power plants. Even if the horizontal row is 10% higher than the vertical installation cost, it will only increase one-tenth of the cost, which is at least one order of magnitude compared to the increase in power generation.

4, horizontal and vertical hidden income

(1) The array spacing is increased and the operation is convenient

Above we talked about the increase in the horizontal row of brackets, the difficulty of installation is slightly increased, and now its advantages are reflected. In areas with small latitudes or small bracket angles, we will find that the array spacing is small, and a slightly larger vehicle is difficult to pass when the components are cleaned. In addition, in power plants combined with other forms such as photovoltaics and agriculture, the array spacing is small, and it is very inconvenient in agricultural operations or other operations.

Under the same shadow magnification condition, the higher the bracket, the larger the array spacing, the higher the bracket in the horizontal row, the correspondingly the array spacing, and the spacing can be applied.

(2) Reduction of the amount of photovoltaic special cable

In addition, the components can be installed in 2 rows in 4 rows. After the U-shaped string of photovoltaic special cable, the DC side is more concentrated. The cable of each string can be completed by using the positive and negative wires. 1×4mm2 The cable usage will decrease and the line loss will decrease accordingly. When the components are vertically arranged, two additional cables need to be connected to the combiner box, the amount of cables is increased, and the line loss is also increased.

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