English 
厦門興林グリーンガーデン木材産業会社 396KW
プロジェクトについて
The rooftop photovoltaic power station project by Xiamen Xinglin Green Garden Wood Industry Co., Ltd. follows the principles of local adaptability, clean and efficient energy use, decentralized planning, and nearby energy utilization. It operates under the model of “self-consumption with surplus power fed into the grid.” Covering a rooftop area of approximately 2,197.69 square meters, the system has an installed capacity of 396KWp, using 900 monocrystalline silicon single-sided photovoltaic modules, each with a capacity of 440Wp. By harnessing solar energy, the project not only generates economic benefits for the company but also contributes positively to society. The facility includes core components such as PV modules, inverters, transmission cables, and mounting structures. The construction timeline is around two months, encompassing phases such as site survey and design, procurement of materials and equipment, installation, system testing, and final commissioning.
Analysis of the Impact of Meteorological Conditions
The Temperature Conditions
The extreme maximum temperature in the area where the project is located is 41.3°C, and the extreme minimum temperature is -5.7°C over many years. It is evident that the high temperatures during the summer season in the project area pose higher requirements for the operating temperature of the components. Additionally, the winter temperatures, which are slightly below zero, are beneficial for improving the power generation efficiency of the components during the winter.
the Impact of Thunderstorms
The area where the project is located has an average of 65.3 thunderstorm days per year over many years, classifying it as a region with frequent thunderstorms. During thunderstorm weather, the safety of the rooftop photovoltaic power station may be greatly threatened. Therefore, when implementing this project, it is essential to consider taking lightning protection measures for both the components and the building.
Key Points of Project Design
Selection of Photovoltaic Modules
Considering the light exposure, power generation, and cost analysis, for Xiamen, where the annual total radiation amount is between 4500 and 5600 MJ/m², crystalline silicon modules are superior to amorphous silicon modules in both cost and power generation. Moreover, the monocrystalline silicon module scheme has better technical indicators and higher conversion efficiency. In light of the actual situation of this project, and considering the limited roof area, choosing modules with larger size, higher operating voltage, and higher peak power can relatively save roof space, construction volume, and bracket materials. Therefore, this project selects monocrystalline silicon cell modules with a peak power of 575Wp for the entire project.
Selection of Photovoltaic Array Operating Mode
The power generation of the solar cell array is related to the intensity of sunlight. The power generation is maximized when the light is perpendicular to the plane of the solar cell array, and it will significantly decrease with the change of the incidence angle. Typically, there are simple fixed brackets and more complex tracking systems for photovoltaic array supports. Considering the actual situation of this project, the available areas and sizes on the factory roof are relatively scattered, so the installation method of the project components chooses fixed mount structure.
Selection of Inverters
Since the total installed capacity of photovoltaic components on each roof of this project is different, to ensure that each factory area has an independent power generation unit, and considering the number of strings of battery components and the matching characteristics of the inverter, to minimize the loss of DC current collection, the inverter selected for this project is a string-type. The altitude in the Xiamen area is relatively low, and the inverter capacity that corresponds to the capacity of the photovoltaic power generation unit can meet the demand. Considering the annual decline of photovoltaic components and the overload capacity of the inverter, the inverter and components in this project are matched at a ratio of 1:1. Combining the layout of the photovoltaic cell components and electrical parameters of this project, a string-type inverter with a maximum output power of 100kW is selected from four different capacities of string-type inverters.
Photovoltaic Array Design
The azimuth angle is the angle between the horizontal projection of the sunlight and the true south direction on the horizontal plane. It represents the deviation of the horizontal projection of the sunlight from the true south direction, with true south direction as the starting point (i.e., 0°), positive to the west, and negative to the east. Since this project is located north of the equator, generally, the photovoltaic array faces true south (i.e., the angle between the vertical face of the array and true south is 0°), the power generation of the solar cells is maximized. To facilitate subsequent construction, the photovoltaic azimuth angle of each building’s roof in this project is the same as the azimuth angle of the building.
In the design of photovoltaic power supply systems, the placement and tilt angle of the photovoltaic module array have a significant impact on the solar radiation received by the photovoltaic system, thereby affecting the power generation capacity of the photovoltaic power supply system. Therefore, determining the optimal tilt angle of the array is an essential part of the photovoltaic power generation system design.The total solar radiation obtained from the meteorological department is on the horizontal surface, and photovoltaic modules usually have a certain tilt angle when installed to capture as much solar energy as possible.The factory area of this project has a color steel tile roof, which is subject to the constraints of the roof structure, and the tilt angle of the components should be consistent with the steel structure, considering a flat layout, and the installation tilt angle is the same as the roof tilt angle.
The components on the color steel plate roof of this project are affected by some shadows and need to avoid the shadow of the roof equipment and the office building. The avoidance principle is that there is no obstruction from 9 am to 3 pm on the winter solstice, and the installation angle follows the roof installation.
Determination of the Number of Modules in Series Circuit
Based on the meteorological data from the reference meteorological station, the extreme maximum temperature in Xiamen area is 41.3℃ and the extreme minimum temperature is -3.7℃. Considering the installation location and characteristics,according to the requirements of the “Design Code for Photovoltaic Power Stations” (GB50797), it is calculated that:
The series connection method of the components in this project is 15 or 17 modules in series for one string.
Design and Installation of Photovoltaic Brackets
The factory buildings of this project are all steel structure factories, and their roofs are made of color steel plates. The photovoltaic brackets in the field area are all in the form of color steel tile roof clip photovoltaic brackets. The solar cell components are laid out at the same slope as the roof. The design uses support pieces fixed on the purlins of the roof, and then zinc-aluminum-magnesium gutters are installed on them. The photovoltaic components are laid on the zinc-aluminum-magnesium gutters, and the gutters are connected to the photovoltaic components with pressure codes or screws. This installation scheme not only does not damage the original building structure, but also does not adversely affect the roof drainage and will not cause roof leakage. In addition to ensuring the service life of the original roof, it also has an effective waterproof and heat insulation effect.
Project Outcomes and Benefits:
The total installed capacity of this project is 396KWp, with an annual full load utilization rate of 1450 hours, and an estimated average annual power generation of 434,000 kWh. This not only brings economic benefits to the owner by reducing the cost of electricity generation but also has significant social benefits. By providing green energy, it supports the sustainable development of regional power supply.
By utilizing photovoltaic power generation as a substitute for traditional coal-fired power generation, this project has made a notable contribution to the protection of the ecological environment. It is expected to save approximately 154.8 tons of coal consumption annually, effectively reducing the emission of “three wastes,” which plays an important role in reducing air pollution and improving air quality.
According to the data from the “China Electricity Industry Annual Development Report 2020,” this project is expected to reduce the following pollutant emissions annually:
- Dust emission by about 0.015 tons
- Sulfur dioxide (SO2) emission by about 0.008 tons
- Nitrogen oxides (NOx) emission by about 0.078 tons
- Carbon dioxide (CO2) emission by about 428.71 tons
In addition, the operation of the solar photovoltaic power station does not consume water resources, thus saving water and reducing the pollution of the water environment caused by wastewater from flue gas desulfurization and warm water discharge from thermal power generation.
If you want to learn more about SOEASY’s professional solutions in the field of photovoltaic power generation or wish to explore cooperation opportunities, we sincerely welcome your inquiries. No matter where you are, we look forward to establishing contact with you to explore the infinite possibilities brought by photovoltaic projects together. Let’s join hands to create a future of green energy!
プロジェクト・プレビュー
