Micro-grid operational status changeable power quality control to be a breakthrough

Micro-grid is divided into two forms, that is, networked micro-grid and independent micro-grid. Grid-connected microgrid has two modes of operation: grid-connected and independent. In grid-connected mode of operation, it generally runs in grid connection with medium and low voltage distribution networks and supports each other to achieve bidirectional energy exchange. In the case of external power grid failure, it can be converted into an independent operation mode to continue to supply power to important loads in the microgrid and improve the reliability of power supply for important loads. By adopting advanced control strategies and control measures, it is possible to ensure the high power quality of microgrid power supply, and to achieve seamless switching between the two operation modes.

Independent microgrids are not connected to conventional grids and utilize their own distributed energy to meet the demands of microgrid loads. When there are regenerative distributed energy in the network, it is often necessary to configure the energy storage system to maintain the power balance between the power supply and the load, and make full use of renewable energy. Such microgrids are more suitable for supplying electricity to users in islands, remote areas and the like.

Grid-connected microgrids can be flexibly switched to their full potential, while stand-alone microgrids must be able to operate independently for long periods of time. Micro-grid operation, load diversity, increased coordination and control difficulties.

Compared with the large power grid, the load fluctuation in the microgrid has a greater impact on the power output, and the operating status of the microgrid is changing, requiring seamless switching during state transition. Therefore, the microgrid is more concerned with issues such as power quality and economy.

In the future, the microgrid will become an integrated energy system that will develop in the direction of structural diversification, intelligent control, concept expansion and complicated functions. Intelligent control of which is to achieve complementary energy control, power plug and play control and power quality control.