The use of solar photovoltaic power generation system and classification

Photovoltaic power generation systems, according to its use place is different, can be divided into two major categories of space and ground application. On the ground can be used as an independent power supply, can also with wind generator or diesel engine and so on hybrid power generation system, can also be connected to power grid, the electric

photovoltaic power generation system, according to its use place is different, can be divided into two major categories of space and ground application. On the ground can be used as an independent power supply, can also with wind generator or diesel engine and so on hybrid power generation system, can also be connected to power grid, sending electricity to the grid. The more widely used photovoltaic power generation system is mainly used as an independent power supply ground. Usually independent photovoltaic power generation system is mainly composed of solar cell phalanx, battery, controller and blocking diode, the role of, respectively, as follows: 1. Photovoltaic phalanx: the square matrix is used to convert solar radiation directly into electricity, using supply load. In general are connected by a number of solar cell components in a certain way, deserve to go up again the appropriate support and connection box. 2. Battery: the battery is solar cell phalanx can storage device, its role is to square unwanted electrical energy stored in the sunshine when, in the evening or rainy days for the use of the load. In photovoltaic power generation system, the battery is in floating charge and discharge state, large amount of summer sunshine, in addition to supply load power, also for battery charging; Less sunshine in the winter, this part of the storage of electrical energy gradually released, on the basis of the seasonal cycle with a much smaller, circulation, square to the battery during the day, At the same time square to load electricity) And all the load power supplied by battery at night. Therefore, requires little self-discharge of battery and charging efficiency, should also consider factors such as price and use is convenient. Commonly used lead-acid batteries and battery silica gel batteries, to demand higher occasion there are prices more expensive nickel cadmium battery. 3. Controller: in different types of photovoltaic power generation system controller each are not identical, its function and complex degree difference is very big, how many should be according to the requirement of the power system and to determine important degree. Controller is mainly composed of electronic components, instruments, relays, switches, etc. In a simple solar battery, the battery in the system, the role of the controller is to protect the storage battery, avoid overcharge, discharge. If grid pv power plant, controller need to have automatic monitoring, control, regulation, conversion and other functions. If the load using an alternating current between the load and battery should also be equipped with inverter, LED street lamps, the role of the inverter is to square and battery low voltage dc into 220 v ac inverter, supply load is used. 4. Blocking diode: also known as reverse filling diode or isolation diodes, its action is one way of using diode electrical conductivity to prevent battery discharge through the solar cell phalanx without sunshine. The requirement to the blocking diode is work, must be greater than the maximum output of current reverse pressure is higher than that of battery voltage. While she was working in a square block on both ends of the diode voltage drop to a certain extent, the silicon diode usually is 0. 6 v ~ 0。 8V； Schottky tube or germanium 0. About 3 v.