What does photovoltaic energy production mean?

The production of photovoltaic energy for fishing is a new way of producing energy. It combines fishing photovoltaic engineering with photovoltaic power generation technology and realizes solar photovoltaic power generation by constructing a fishing photovoltaic platform with ocean photovoltaic power generation function . The production of photovoltaic energy through fishing has many advantages, for example: it can balance fish production and solar energy production, does not occupy land resources, is not limited by climatic conditions and presents high economic benefits.

Fishing photovoltaic power generation projects have been built in many regions of China, such as Zhangpu, Fujian, Zhanjiang, Guangdong and other places. The first photovolt energy production demonstration projectThe world's largest fishing and photovoltaic project is being built in Zhangpu, Fujian. The project covers an area of ​​approximately 3,000 acres and is comprised of 12 complementary fishing and photovoltaic platforms. 10 million kilowatt hours. The fishing and photovoltaic hybrid power generation project built in Zhanjiang, Guangdong, is covered by photovoltaic power generation panels on the fishing and photovoltaic platform, with annual power generation capacity of more than 4 million kilowatt hours.

Photovoltaic energy production through fishing is a direction for future energy development. It functions both in electricity generation and fisheries production, and can improve the overall use of marine resources. In the future, with continued technological advancements and increased investments, power generation projectsPhotovoltaic energy in the fishing sector will be more widely promoted and applied at home and abroad, becoming one of the important means to promote the development of renewable energy.

Is it expensive to build photovoltaic power generation on water?

Solar cell components are the essential components of power generation systems solar energy that converts light energy into electrical energy. cells are these essential components. The key part of the component is a kind of radiant energy, which needs to be converted into electrical energy using an energy converter. This energy converter which converts light energy into electrical energy is a solar cell. The basis of the principle of silicon solar cells is the photovoltaic effect of the PN junction of the semiconductor. It is an effect according to which when an object is exposed to light, the state of distributionn charges in the object change and generate an electromotive force and current. When sunlight or other light irradiates the PN junction of a semiconductor, a voltage appears on both sides of the PN junction. This phenomenon is called photovoltage, which is the famous photovoltaic effect. If the PN junction is shorted, a current occurs. be generated. As we all know, atoms of matter are composed of nuclei and electrons. Nuclei are positively charged and electrons are negatively charged. The electrons orbit the nucleus in a certain orbit, just like the planets orbit the sun. The atoms of monocrystalline silicon are arranged according to certain rules. The outermost electronic shell of silicon contains 4 electrons.

The outer electrons of each atom have a fixed position and are bound by the nucleus. When excited by external energy, such as solar radiation,they break away from the chains of the atomic nucleus and become free electrons, while leaving free space in their original place, the so-called "hole" in semiconductor physics. . Since electrons are negatively charged, holes appear to be positively charged. Electrons and holes are charges that can move in single crystal silicon. In a pure silicon crystal, the number of free electrons and holes is equal. If a silicon crystal is doped with impurity elements such as boron, aluminum, gallium and indium that can capture electrons, a hole-type semiconductor is formed, called a hole-type semiconductor. hole.P-type semiconductor. If the silicon crystal is doped with impurity elements such as phosphorus, arsenic or antimony which can release electrons. It then forms an electronic semiconductor, called an N-type semiconductor. If these two semiconductorsWhen they are combined, a PN junction will form at the interface due to the diffusion of electrons and holes, and a built-in electric field, also known as the barrier electric field, will form on both sides of the junction. Since the resistance here is particularly high, it is also called a barrier layer. When sunlight illuminates the PN junction, the atoms of the semiconductor release electrons due to obtaining light energy and as a result, electron-hole pairs are generated. Under the action of the barrier electric field, electrons are directed toward the N-type region and holes are directed toward the P-type region, resulting in an excess of electrons in the N-type region. There are excess holes in the P-type region. As a result, a photogenerated electric field opposite the barrier electric field strength is formed near the PN junction.

Part of the photogenerated electric field comthink the barrier electric field, and the remaining part charges the P-type region positively. The N-type region is negatively charged; thus, the thin layer between the N-type region and the P-type region generates an electromotive force, that is, a photovoltaic electromotive force. When the external circuit is connected, electrical energy will be produced. This is the basic principle of power generation by PN junction contact monocrystalline silicon solar cells. If dozens or hundreds of solar cells are connected in series or parallel, an output power of several tens of watts to more than two hundred watts can be obtained to form a solar cell module. The solar cell module is then connected in series or parallel to form. a solar cell. The square array of batteries can produce enough power for charging.

In terms of building systemsPure water photovoltaic systems are mainly divided into water pile type and water floating platform type.

1. Since the construction of the foundation of the water pile photovoltaic system is more difficult, the cost will also increase to a certain extent. (For example, pump water, then drive the stakes, then attach the support)

2. The advantages and disadvantages of floating water photovoltaics are as follows:

1. the advantages are as follows:

② Increase power generation: Water has a cooling effect on photovoltaic modules, which can suppress the increase in surface temperature of modules, thereby achieving power generation higher. According to a comparative analysis of experiments carried out in alarge-scale floating photovoltaic power plant in Hyogo Prefecture, Japan, the panel's power output increased by about 14% due to the cooling effect of the water surface.

③ Reduce evaporation and algae reproduction: Covering solar panels on the water surface can theoretically reduce water evaporation and inhibit algae reproduction in water, which is beneficial for the protection of water resources.

④ Convenient operation and maintenance: Photovoltaic power plants are built in water, which can reduce dust pollution on components and facilitate cleaning of components. At the same time, it is difficult for users and animals to access the components. which can effectively prevent people and animals from damaging the components.

⑤ Tourist advantages: the photovoltaic modules carefully arranged on the vThis water surface can be used as a unique attraction and become a landscape in the region, bringing tourism benefits.

⑥ Avoid shading of modules: Compared with land, the water surface is relatively open, which can effectively avoid shading of modules by mountains, woods, etc. Block, the solar irradiation area is uniform and the lighting duration is long.

⑦ Reduce the cost of the tracking system: The angles and spacing of the components are consistent, making it easier to install and operate the solar tracking system. There is no need to install a two-axis tracking system for each. solar panel, which greatly reduces the cost of the tracking system.

⑧Cost saving: No foundation and component supports are required, saving the cost of foundation and supports and reducing costs.

⑨ Practical consumption: Built ins waters close to villages and towns, it can be consumed nearby, thereby reducing adverse factors such as network connection difficulties and power outages, and improving efficiency.

2. There are some disadvantages:

① High requirements for floating equipment: floating water photovoltaics requires floating equipment to support the photovoltaic panels, and the floating frame has corrosion resistance, low density , and frost heave resistance, wind and wave resistance, service life, bearing capacity, etc. must all be high.

② High requirements for site selection: the site of the floating water photovoltaic farm should be selected in a location with a large area, stable runoff, low wind speed, good water conditions. lighting, low changes in water level, good development conditions, et no large-scale navigation, ecologically non-sensitive areas and other waters.

③There are many uncertain factors: strong winds, water level, ice and other factors have a greater impact. At the same time, it is necessary to monitor whether photovoltaic modules have adverse effects on water. quality, fish, plants, etc.

④ Construction difficulty: Many factors need to be considered during the construction process. It is difficult to use a large number of heavy machines for high-efficiency construction in water operations. The process requirements are relatively higher. and the construction period is also increased accordingly. There are many jobs that require diving or being on a boat. Balance and safety must be considered when operating on board, and facilities such as swimming pools and barsrages must not be damaged.