Reading: international standard 'regulations of micro electrical planning and design,

A few days ago, China can build Planning group hunan institute participated in micro grid international standard of the IEEE it Practice for the Planning and Design of the Microgrid '( Micro power grid planning and design procedures) Official release, the standard proposed micro power grid in the key consideration of planning and design phase, the micro grid system planning, design and evaluation of proposals are put forward.

the rp covers planning and design should consider the factors in micro grid. It provides the need to consider in the planning and design method and the good practice, including system configuration, electrical system design, safety, power quality monitoring, energy metering and scheme evaluation. The rp power grid can be attached or independent of communication networks.

the micro grid is a distributed power supply, power load, power distribution facilities, monitoring and protection devices such as small distributing electricity system ( Hair change energy [2017] no. 1339 'promote interconnection type micro power grid construction trial measures') 。

reading: micro power grid is contains the source and net, the Netherlands, the small distributing electricity storage system, the configuration complete control protection system, it may be said the sparrow is small, all-sided. Have the following four characteristics.

mainly embodied in the micro grid access to distribution network side, low voltage level and the capacity is small, and generally in 35 kv and below capacity of the system ( Maximum load) In principle is not more than 20 mw.

　　“ Source & throughout; In renewable energy sources such as photovoltaic, wind power, tidal power is given priority to, or in more than gas installations ( CHP) Comprehensive utilization of energy as the objective form of electricity generation, such as clean and environmental protection.

through source, the Netherlands, the coordinated control of storage, realize the exchange between power grid and power control is adjustable, can reduce the impact of large-scale distributed power supply access to grid.

(micro power grid Micro- 网格) Also called 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 distribution system.

in the micro grid power supply for more capacity of small distributed power supply, power electronic interface which contains small units, including the micro gas turbine, fuel cells, photovoltaic cells, small wind turbine, etc.

including battery, thermal energy storage, such as excess energy stored in the form of electrical or other energy, when you need to use, so that the micro grid to realize the internal power supply and demand balance, to stabilize the voltage and frequency.

load refers to the micro grid electricity capacity. If you are established for a mobile phone micro power grid, the load may be very small. But if it is for a hospital to build micro power grid, the load is bigger, the corresponding energy storage devices may be larger.

grid type micro grid is connected with external power grid operation. When the micro grid and large power grid together, will automatically turn off the circuit breaker, have large grid work, own power generation system startup grid-connected power generation mode at the same time, and provids the exchange of power distribution system.

once the power grid failure or power quality can't meet the demand, micro power grid will be fast and large power grid disconnection and run independently. The switch in the ear of complete, smooth transition, not a trace. At this point, the micro grid into an island mode, completely on their own to generate electricity.

first, micro power grid construction of relatively low cost in local place. For example, in an isolated island, through large power supply, cable laying submarine cables and set up the tower, time-consuming and laborious, micro power grid of the system costs are lower than those of erection of large power grid way, more economical and practical.

the micro grid is very flexible, which can realize new energy on the given. Such as: the west wind, solar energy resources are rich in remote parts, micro power grid using these new energy power generation, and realize the in situ given, for the use of local residents, the extra electricity can also store will use later.

in recent years, the national renewable energy advocates promote the water in the proportion of energy consumption, to guide the development of distributed photovoltaic, wind power and other green energy. Large amount of distributed power supply, the power grid operation caused a certain influence. Due to grid interconnection decay has perfect hair distribution system, through the energy storage device and load of power and stability and can help power grid control, green energy for large-scale development has positive significance.