As an efficient and environmentally friendly power generation technology, microgrid is different from traditional grids in relay protection because its grid operation affects the structure of distribution networks and the size and distribution of short-circuit currents in distribution networks. After the microgrid is connected to the grid, it will cause several impacts on the original grid: reduce the sensitivity of the line protection; if the adjacent line fails, it may cause the line protection to malfunction; the impact on the reclosing, the impact on the protection scope, etc. . The unique operating characteristics of the microgrid determine that its protection technology is different from that of the traditional power system. As the microgrid is in the demonstration stage in China, the domestic R&D of its relay protection products is insufficient or lagging behind. The research and development of protection products for the operation of microgrids is the key to the application of microgrids from the demonstration to the practical application in China.
There are two main points in the protection of microgrid protection products:
(1) Products with quick current cut-off and current limit cut-off
The research and development of the product can inherit the research and development ideas of the traditional current quick-disconnect and limited-time current quick-disconnect products. In research and development, it can combine the intelligent elements of the micro-grid, such as the collection of certain parameter values ​​of the protection point or the line, facilitating the development of the micro-grid in the later period. Information interaction or fusion.
(2) Current direction protection and power direction protection
The connotation of the microgrid is to realize the two-way flow of energy flow, and the selectivity and reliability of the microgrid will not be met after it is connected to the large power grid. Therefore, it is very important to adopt directional current protection and directional power protection. Necessary and effective. Since the microgrid has a relatively large environmental impact, the importance of the protection's operating frequency and protection is obviously higher than that of traditional protection. Sensitivity, directionality, and reliability all require targeted improvements.
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