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Polaris Smart Grid Online: First, the application prospect of microgrid
1. Grids at all levels: Including the national grid, regional grids, provincial networks, and local grids, etc., provide multi-level emergency response mechanisms for natural disasters and platforms for rural electrification.
2. Different types of work departments: including power planning, power dispatch, and market transactions, etc., provide new working mechanisms and platforms for various departments.
3, different types of industry sectors: including government agencies, fire, hospitals and military, etc., to provide uninterrupted power for all important loads to ensure reliability of power supply.
4. Research unit: As a new research branch of the theory and application of micro-grid technology system.
Second, the basic structure of microgrid
The schematic diagram of the structure of the microgrid is shown in the figure. It may form part of a medium-voltage or low-voltage distribution network, and the load is supplied through a distributed power supply. According to the operating characteristics of the microgrid, the microgrid may be connected to the large-scale power grid through the PCC and can also be disconnected from it into the isolated grid operation mode (IG). When the microgrid is connected to the grid, the operation and control modes of the microgrid also switch between the two states, namely, the Grid Dependent (GD) and the Grid Independent (GI). . The difference between GD and GI mode is whether there is power exchange between the microgrid and the large grid.
According to the structure, the microgrid can be divided into three types: micro-grid, industrial micro-grid, and remote micro-grid.
1. Area microgrid
There are two kinds of microgrids in the area, one is the urban network and the other is the rural feeder. The former is mainly used in the prosperous areas of the city, while the latter is used to plan the rural power grid. The development momentum of the grid power grid is the need for outage management and integration of renewable energy power generation. The main role of the micro grid in the area lies in
Reduce the emission of greenhouse gases; provide a variety of energy supply to users; block management; delay the upgrade of power networks. In addition, the microgrids in the area can provide auxiliary services such as local reactive voltage support and high power quality.
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