Risks of breakdown of the solar cell network:
1. Due to the reduction of the current of a single cell, it will affect the electrical performance of the entire component and reduce the power.
2. In future grid-connected power plants, due to the hot spot effect inside the components, the local heat will be too high, which will affect the life of the components and burn them seriously.
Dangers linked to photovoltaic energy production: risk of fire, hidden fault in power plant equipment, risk of grounding failure.
1. Fire risk
Photovoltaic power generation equipment has been operating in an outdoor environment for a long time. Light erosion, rain, sand, etc. will speed up the cable. Aging of equipment such as connectors and equipment leads toa decrease in equipment insulation performance, causing equipment failures and even fires.
Therefore, it is necessary to regularly test the electrical wiring and power generation equipment of the photovoltaic system, and make necessary repairs or replacements for aging cables and equipment to ensure safe operation of the system and reduce risks. of fire.
2. Hidden defects of power plant equipment
Irregular operation of photovoltaic modules during transportation and installation will cause internal cracks, trees and weeds or the shielding. Bird droppings will cause hot spots to form on components. These hidden defects will not only affect the output performance of components, but also lead to fires in severe cases.
Given qBecause these hidden defects cannot be detected directly with the naked eye, it is necessary to use professional instruments to regularly detect components, eliminate hidden defects in a timely manner, and prevent safety accidents.
3. Risk of Grounding Failure
Like all electrical equipment, photovoltaic modules and mounting systems must be grounded to reduce the potential risk of electric shock and damage. 'fire. If the performance of the grounding system degrades over time, this increases the risk of electric shock to personnel approaching and coming into contact with metal parts of the photovoltaic system.
In the event of an electric shock, damage can be significant due to the high voltage of the photovoltaic field. Therefore, it is necessary to regularly perform testing and maintenance of the performance of mgrounded to effectively prevent degradation of grounding performance.
Principle of photovoltaic power generation:
The main principle of photovoltaic power generation is the photoelectric effect of semiconductors. When a photon irradiates a metal, all of its energy can be absorbed by an electron in the metal. The energy absorbed by the electron is large enough to overcome the Coulomb force inside the metal atom to do work, escape from the metal surface and become. a photoelectron.
Silicon atoms have 4 outer electrons. If atoms with 5 outer electrons, such as phosphorus atoms, are doped with pure silicon, they become an N-type semiconductor; if 3 atoms are doped with pure silicon, the atoms; with external electrons, such as boron atoms, form a P-type semiconductor.
When P-types andN are combined, a potential difference is formed on the contact surface and becomes a solar cell. When sunlight hits the P-N junction, current flows from the P-type side to the N-type side, forming a current.
The photoelectric effect is an important and magical phenomenon in physics. Under the irradiation of electromagnetic waves above a certain frequency, the electrons contained in certain substances absorb energy and escape to form an electric current, that is, photoelectricity.
Reference for the above content: Baidu Encyclopedia-Photovoltaic Power Generation