The principle and components of solar photovoltaic power generation system

”; Photovoltaic effect quot; , hereinafter referred to as 'photovoltaic effect'. Refers to the uneven illumination semiconductor or generate an electrical potential difference between different parts of the semiconductor and metal combination. It is first and foremost by the photon ( Light waves) Into electronic, light energy into electrical energy

quot photovoltaic effect, hereinafter referred to as 'photovoltaic effect'. Refers to the lighting in the nonuniform semiconductor or between different parts of the semiconductor and metal combination causes the phenomenon of electric potential difference. First of all, this is a photon ( Light waves) Into electronic, the process of convert light energy into electrical energy. Second, it is a process of voltage form. A voltage as built a dam. If the two are linked together, can form a current loop. Solar cell manufacturing based mainly on semiconductor materials. According to different materials, the solar pv cells can be divided into: 1. Silicon solar cell; 2. By inorganic salts such as gallium arsenide iii - V compounds, cadmium sulfide, copper indium selenium and other multicomponent compounds made of battery; 3. Functional polymer materials solar battery: 4. Nanocrystalline solar cells, solar panels, etc. Solar power generation system according to whether or not connected to the electricity grid and grid systems can be divided into off-grid system. According to its applications, can be divided into household power systems, commercial power generation systems and solar power generation system. The composition of the system has varied from different categories. 我。 Off-grid system. Standard off-grid system is mainly composed of solar panels and brackets, off-grid inverter, battery, charge controller and the distribution box. Off-grid inverter convert solar panels or storage battery dc into alternating current (ac), for the use of household appliances. Charge controller to control charging. When the panels generate more energy than the system energy, the controller for battery charging, and vice versa. This system is usually only a few kilowatts. There is no detailed description of non-standard off-grid system. Its system is very simple, only need to output direct current (dc). This kind of non-standard system is mainly used in the poor areas. The system about the size of dozens to hundreds of watts. two Grid system. Grid system is the most widely used system. It is divided into pure grid system and dual function interconnection system. At present, most of the grid system is pure interconnection system on the market. The main component of the system are: solar panels, grid inverter and distribution box. Parallel system must be connected to the grid. When the system to produce electricity than the consumption of electric power system, redundant power to the grid will be for sale. If the system generated power is less than the system power consumption, the system will automatically get power from power grid and the output to the user load. When power grid failure or is cut off, however, the grid system will be unable to work. In addition to the interconnection function, dual function system also has the function of off-grid. As a result, its system structure is more complex, but also the most expensive system. First of all, its inverter design more complex than ordinary grid inverter. It supports the panels of the DC input and storage battery DC input. General inverter only supports the DC input from the panels. In addition, the double function system must have a storage battery. If there is no charging grid inverter control, equipped with charge controller is needed. The size of the public system is also a few kilowatts.