Micro grid application in the building photovoltaic system and mode is what

The micro grid ( Micro- 网格) Also translated into piconets, it is to point to by the distributed power supply, energy storage device, energy conversion device, load, monitoring and protection devices such as small power distribution system. Micro power grid is proposed to achieve high flexibility of distributed power supply,

piconets is also called the micro network, it is to point to by the distributed power supply, energy storage device, energy conversion device, load, monitoring and protection devices such as small power generation and distribution systems. Micro network is put forward to achieve flexible and efficient application of the distributed generation, to solve the distributed power grid number, various problems. DC micro power grid, a distributed power supply, energy storage device, load, etc. Connected to the DC bus, through the power electronic inverter DC network connection to the external ac power grid. DC micro grid power electronic switching device to different voltage grade of power supply, ac and DC load of distributed power supply and load fluctuation can be adjusted by the DC side of energy storage device. Micro communication network: distributed power, energy storage device, etc. Through the power electronic devices connected to the ac bus. At present, the micro communication network is still the main form of piconets. Through the switch on the control of PCC, can realize the micro grid parallel operation and island operation of the switch. Micro ac/DC hybrid power grid: it contains ac busbar and DC bus, can communicate directly to the load and DC load power supply. Medium voltage power distribution feeder piconets: based on the medium voltage power distribution feeder piconets, effectively integrate the distributed power supply and load. Applies to medium capacity, high power supply reliability requirements, the user of the power supply relatively concentrated area power supply. Low voltage micro grid: through proper integration of the distributed load power and low voltage level to the users without forming micro power grid. Most of these micro power grid for power or energy users all, relatively small. Micro power grid is made up of distributed power supply, load, energy storage, control and protection of autonomous power system, can run independently, can also be run in parallel. Micro network capacity is general not big, but because it can run independently, so it integrates power generation, transmission, distribution and utilization of running and managing characteristics. Compared with large external power grid, the grid is usually a single control unit, can according to need to merge or isolated operation, to meet user demand for the diversification of power quality and power supply reliability, guarantee the important user uninterruptible power supply, improve power supply reliability. At the same time, the net inclusive, flexibility, customization, economy and the characteristics of autonomy. It is an effective supplement for large power grid, it is the effective use of renewable energy, has great development potential. In short, the micro grid is not only a 'small, friendly, independent' three basic characteristics, and has a 'clean, efficient and smooth running state switch' three important characteristics. Building photovoltaic systems are usually built in the center of the load. When the proportion of photovoltaic power generation in certain power supply area is high, It is generally believed photovoltaic power generation by more than 30% of the peak load of power supply area) , will affect the safe and reliable operation of the distribution network. Adopting micro grid can be stable photovoltaic power fluctuations, improve power quality, greatly improve the performance of grid on the building photovoltaic system. At the same time, the use of micro electric wind technology plays a role of peak shift, enable photovoltaic properties to match the load characteristics, real-time tracking price changes, thus improve the building photovoltaic (pv) power generation benefits of the system. Because of its flexible network characteristics, suitable for micro power grid power supply high reliability requirements of users, can also be used as a disaster backup system.