Microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage

Abstract

The invention relates to a microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage. The method comprises the following steps: a current limiter and a quick energy storage device are cooperatively controlled to promote fault crossing capability of a microgrid under some conditions, considering the difference among fault positions and interaction needs of a high penetration power when the microgrid encounters an external short circuit fault; the fault current limiter and the quick energy storage device are cooperatively controlled to ensure that the microgrid realizes smooth transition between a grid-connected mode and an island mode when such special conditions occur that as a microgrid link circuit is in short circuit, the microgrid must be disconnected from the main grid. The microgrid transient performance intensification device exerts positive effect on suppressing the microgrid power fluctuation and promoting electric energy quality so as to improve resistance capability of the microgrid to an external short circuit fault, and ensure the operation reliability of the microgrid.

Description

technical field [0001] The invention belongs to the field of electric power system and automation, and in particular relates to a micro-grid transient performance enhancement device and method based on fault current limiting-fast energy storage coordinated control, which is used to improve the robustness of high-permeability micro-grid against external short-circuit faults , to ensure its transient operation performance. Background technique [0002] Under the dual pressure of energy demand and environmental protection, both at home and abroad are focusing on the research field of distributed generation (DG) of renewable energy, and building a sustainable energy system has become the consensus and inevitable development trend of all countries. Existing research and practice results show that wind power generation, solar photovoltaic, fuel cell and other DGs connected to energy storage devices and loads to form a micro-grid operation can give full play to the efficiency and a...

AI Technical Summary

Problems solved by technology

The IEEE1547 standard stipulates the exit conditions for distributed power generation when the main grid fails, but after the distributed power generation is connected to the grid in the form of a microgrid, the situation is quite different.

If any external fault triggers the switch on the tie line of the common coupling point to isolate the microgrid, it will have a negative impact on the reliability and flexibility of the operation of the microgrid, and in a sense, it does not meet the original intention of building a microgrid.

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