Classifications of Solar Cells (Part Two)

Classifications of Solar Cells (Part Two)


1.6 Hybrid power supply systems
In addition to the solar photovoltaic module array, this solar photovoltaic system also uses an oil generator as a backup power supply. The purpose of using a hybrid power supply system is to comprehensively utilize the advantages of various power generation technologies and avoid their respective disadvantages. For example, the advantage of the above-mentioned independent photovoltaic systems is that they require less maintenance, but the disadvantage is that the energy output depends on the weather and is unstable. A hybrid power supply system that uses a combination of diesel generators and photovoltaic arrays can provide energy that is independent of the weather compared to independent systems with a single energy source.
 
1.7 Grid-connected hybrid power supply systems
With the development of the solar optoelectronics industry, grid-connected hybrid power supply systems that can comprehensively utilize solar photovoltaic module arrays, mains power and backup oil generators have emerged. This kind of system usually integrates the controller and the inverter. It uses computer chips to fully control the operation of the entire system, comprehensively utilizes various energy sources to achieve the best working condition, and can also use batteries to further improve the load power supply guarantee rate of the system. For example, AES's SMD inverter system. The system can provide qualified power to local loads and can operate as an online UPS (uninterruptible power supply). Power can also be supplied to or obtained from the grid. The system usually works by running the mains power and solar power in parallel. For local loads, if the power generated by the photovoltaic modules is enough for the load, it will directly use the power generated by the photovoltaic modules to supply the load needs. If the electric energy generated by the photovoltaic modules exceeds the immediate load, the excess electric energy can be returned to the grid; if the electric energy generated by the photovoltaic modules is not enough, the mains power will automatically start and the mains power will be used to supply the local load. Moreover, when the power consumption of the local load is less than 60% of the rated mains capacity of the SMD inverter, the mains will automatically charge the battery to ensure that the battery remains in a floating charge state for a long time. If the mains fail, that is, a mains power outage or an unqualified mains power, the system will automatically cut off the mains power and switch to the independent working mode, with the battery and inverter providing the AC power required by the load. Once the mains power returns to normal, that is, the voltage and frequency return to the above-mentioned normal state, the system will disconnect the battery and switch to grid-connected mode to be powered by the mains power. In some grid-connected hybrid power supply systems, system monitoring, control and data acquisition can also be integrated into the control chip. The core components of this system are the controller and inverter.