The development prospects of independent photovoltaic power generation?

: ac, dc power supply system of pv systems can provide power for dc and ac load at the same time, the system structure is more than the above three kinds of system on the inverter, used to convert dc to ac to meet the needs of the ac load. Usually this is

ac and DC power supply system, the photovoltaic system can be power supply for DC and ac load at the same time. Compared with the above three kinds of system, it is on the system structure more inverter, converts DC power to ac power, in order to meet the requirements of the ac load. Usually, the system load power consumption also relatively large, so the size of the system is also relatively large. It has been applied in some communication base stations with ac and DC load as well as the other with ac and DC load of photovoltaic power station. Simple DC system: this system is characteristic of load in the system for DC load, the use of load time no special requirements. Load is mainly used in the daytime, so do not use the battery or controller in the system. The system structure is simple, direct use of pv modules supply power to load, save the battery energy storage and release process and the energy loss in the controller, to improve the efficiency of energy utilization. It commonly used light volt pump system, some temporary facilities in the day and some tourist facilities. The figure below shows a simple DC photovoltaic pump system. This system has been in developing countries do not have clean water area of the widely used, and has produced good social benefits. Grid system: the main characteristics of the solar photovoltaic system is photovoltaic array produced by direct current (dc) through the grid inverter converted to meet the requirements of the commercial power grid alternating current (ac), and then direct access to the commercial power grid. In a grid system, in addition to the ac load, photovoltaic array still feedback to the electricity grid. On a rainy day or night, when the pv array to generate electricity or produce electricity will not meet the demand of load, the power supply. Because of the direct input electricity grid, saves the configuration of the battery, save the battery storage and release process, photovoltaic array to produce electric energy can be fully used, thus reducing the energy loss and the cost of the system. But the system requires a special grid inverter, to ensure that the power output to meet the requirements of the indexes of power grid frequency and voltage. Because of the efficiency of the inverter, there are still some energy loss. This system can usually use commercial power and solar photovoltaic modules in parallel array as a local ac load of power supply. To reduce the load of the entire system losing electricity rates. In addition, the grid photovoltaic (pv) system can be on the public power grid peak sharpening effect. However, grid as a distributed power generation systems, photovoltaic power generation system can produce some of the traditional centralized power supply system of power grid, such as harmonic pollution, such as islanding. Hybrid power supply system: in addition to solar photovoltaic module array, the solar photovoltaic system also USES an oil engine as backup power supply. Using hybrid power supply system is the purpose of comprehensive use of the advantages of all kinds of power generation technology, avoid their shortcomings. Using hybrid power supply system can better use of renewable energy power generation. Shijiazhuang solar power system classification has high practicability. Less maintenance, less fuel consumption; Fuel efficiency is higher. Load matching more flexible.