Learn about photovoltaic power generation in 3 minutes! | 1 article is amazing and makes it clear!

Learn about photovoltaic power generation in 3 minutes!

​​As a green industry, photovoltaic power generation has been rising in popularity in recent years. According to statistics, China’s photovoltaic installed capacity will rise rapidly in 2022, with an additional grid-connected capacity of 87.408GW, of which distributed photovoltaic power stations will be 51.114GW, accounting for approximately 58.48% of the total.

Why can photovoltaic installed capacity continue to grow? What is photovoltaic power? What’s so magical about it? Today we will take a look at the relevant knowledge about photovoltaic power generation with everyone.

What is photovoltaic power generation?

Photovoltaic power generation refers to a power generation method that uses solar radiation to directly convert into electrical energy. High-efficiency solar cells can significantly improve the efficiency of photovoltaic power, allowing more solar energy to be converted into electrical energy. Photovoltaic power generation is the mainstream of solar power generation today. Therefore, what people often call solar power generation now is photovoltaic power.

What is distributed photovoltaic power generation?

Distributed photovoltaic power generation refers to equipment built near user sites. The operation mode is mainly self-consumption on the user side. The excess electricity is connected to the Internet and is a photovoltaic power generation facility characterized by balanced regulation of the power distribution system.

Photovoltaic power generation is a sustainable and renewable energy source
Photovoltaic power generation is a sustainable and renewable energy source

How do photovoltaic cells generate electricity?

A photovoltaic cell is a semiconductor device with light and electricity conversion characteristics. It directly converts solar radiation energy into direct current. A photovoltaic cell is the most basic unit of photovoltaic power generation. The design principle of photovoltaic modules is based on connecting multiple photovoltaic cells in series or parallel to achieve the required voltage and current output.

The unique electrical properties of photovoltaic cells are achieved by doping certain elements (such as phosphorus or boron) into crystalline silicon, thereby creating a permanent imbalance in the molecular charge of the material and forming a semiconductor material with special electrical properties.

Free charges can be generated within semiconductors with special electrical properties when exposed to sunlight. These free charges move in directions and accumulate, producing electrical energy when their ends are closed.

This phenomenon is called the “photovoltaic effect”, or photovoltaic effect for short.

distributed photovoltaic power generation system

The distributed photovoltaic grid-connected power generation system mainly consists of photovoltaic modules, inverters, brackets and cables, combiner boxes, AC and DC distribution cabinets, and monitoring systems.

Among them, the combiner box, AC and DC distribution cabinet, and monitoring system can be installed according to the actual situation of the user.

Why is it said that photovoltaic power is green and low-carbon energy?

Photovoltaic power generation has significant energy, environmental protection, and economic benefits. It is one of the highest-quality green energy sources. If a 1 kilowatt photovoltaic power generation system is installed under China’s average sunshine conditions, it can generate 1,200 kilowatt hours of electricity in one year, which can reduce coal (standard coal) The usage amount is about 400 kilograms, reducing carbon dioxide emissions by about 1 ton. According to the research results of the World Wildlife Fund (WWF):

In terms of the effect of reducing carbon dioxide, installing 1 square meter of photovoltaic power generation system is equivalent to planting 100 square meters of trees. Currently, the development of renewable energy sources such as photovoltaic power generation is one of the effective means to fundamentally solve environmental problems such as haze and acid rain.

How much sunlight do we have available? Can it become the dominant energy source in the future?

The solar radiation received by the earth’s surface can meet 10,000 times the global energy demand. The average annual radiation received per square meter of the earth’s surface varies between 1000-2000KWH depending on the region. According to the International Energy Agency, in 4% of the world’s deserts Installing solar photovoltaic systems will be enough to meet global energy needs. Solar photovoltaics enjoys broad development space and its potential is huge.

According to preliminary statistics, the market potential of photovoltaic power generation in China using existing building installations alone is about 3 trillion kilowatts. In addition, the vast Gobi photovoltaic power generation market potential in the West is about billions of kilowatts. With the growth of photovoltaic power generation With technological advancement and large-scale application, its power generation cost will be further reduced, becoming a more competitive energy supply method, gradually changing from supplementary energy to alternative energy, and hoping to become the dominant energy source in the future.

Which locations are suitable for installing distributed photovoltaic power generation systems?

Industrial plant

In factories with relatively large electricity consumption and relatively expensive online electricity purchases, the roof area of ​​the factory is usually large open, and flat, which is suitable for installing photovoltaic arrays. Due to the large power load, the distributed photovoltaic grid-connected system can be used for on-site consumption. This will offset part of the electricity purchased online, thus saving electricity bills. Before installing a photovoltaic array, a photovoltaic module testing project needs to be conducted to ensure the safety and efficiency of the system.

Commercial Building

The effect is similar to that of an industrial park, but the difference is that most commercial buildings have cement roofs, which is more conducive to the installation of photovoltaic arrays. However, there are often requirements for architectural aesthetics, based on the characteristics of commercial buildings, office buildings, carports, hotels, conference centers, resorts, and other building categories. User load characteristics are generally higher during the day and lower at night, which can better match the photovoltaic power generation characteristics.

agricultural facilities

There are a large number of available rooftops in rural areas, including self-owned residences, vegetable greenhouses, fish ponds, etc., but they are often at the end of the public power grid and have poor power quality. Building distributed photovoltaic systems in rural areas can improve power security and power quality.

Remote agricultural and pastoral areas and islands

Due to the distance from the power grid, there are still millions of people without electricity in remote agricultural and pastoral areas in Tibet, Qinghai, Xinjiang, Inner Mongolia, Gansu, Sichuan, and other provinces as well as in my country’s coastal islands.

Photovoltaic power generation converts sunlight directly into electricity using solar panels
Photovoltaic power generation converts sunlight directly into electricity using solar panels

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