Microgrid protection control system, method and device and storage medium

Abstract

The invention provides a microgrid protection control system, method and device and a storage medium. The system comprises a first detection device, a second detection device, a calculation module, a judgment module and a control module, wherein the first detection device is arranged at a large power grid side and is used for detecting a first voltage and a first current of the large power grid side; the second detection device is arranged at the micro-grid side and is used for detecting a second voltage and a second current of the micro-grid side; the calculation module is used for obtaining a voltage parameter and/or a current parameter; the judgment module is used for judging whether the voltage parameter and/or the current parameter exceed a threshold value; and the control module is used for controlling the on-off state of a public grid-connected point according to the judgment structure of the judgment module. According to the system, the detection devices are arranged at the two sides of the public grid-connected point, and the states at the large power grid side and the micro power grid side are monitored respectively, so that the fault detection and positioning are rapidly and accurately carried out, the key devices in a direct current micro power grid are protected, and it is ensured that other parts in the system can still operate safely and reliably.

Description

technical field [0001] The present invention relates to the Internet field, in particular to a microgrid protection control system, method, equipment and storage medium. Background technique [0002] The DC microgrid is a microgrid composed of DC, which is an important part of the future intelligent power distribution system and is of great significance for promoting energy conservation and emission reduction and realizing sustainable energy development. Compared with AC microgrids, DC microgrids can more efficiently and reliably receive distributed renewable energy generation systems such as wind and light, energy storage units, electric vehicles and other DC power loads. [0003] At present, for the multi-terminal DC power distribution system based on the voltage source converter, methods such as DC current mutation, DC power or DC power mutation are used to detect whether a DC fault occurs; a multi-terminal DC power distribution system protection scheme is proposed, based...

AI Technical Summary

Problems solved by technology

Due to the access of a large number of distributed power sources, the micro-grid is no longer the single-power radial structure of the traditional distribution network, so some lines will have bidirectional short-circuit currents when there is a short circuit, and the equivalent power capacity on both sides of the fault is quite different. , the fault current contribution ability of the weak-end power supply is small

[0006] (2) The short-circuit current of the microgrid is significantly different under the two modes of grid-connected and island

[0007] (3) The short-circuit current of distributed power supply varies greatly

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