A microgrid transient performance enhancement device and method based on fault current limiting-fast energy storage coordinated control

Abstract

The present invention relates to a micro-grid transient performance enhancement device and method based on fault current limiting-fast energy storage coordinated control, as follows: when the micro-grid encounters an external short-circuit fault, considering the difference in fault location and the interactive demand for high penetration power, Under certain fault conditions, the coordinated control of the current limiter and the fast energy storage device can improve the fault ride-through capability of the microgrid; for some specific conditions such as the short-circuit fault of the tie line of the microdistribution network, the microgrid must be disconnected from the main network At the same time, the coordinated control of the fault current limiter and the fast energy storage device can ensure the smooth transition of the microgrid between the grid connection and the island mode. The present invention can effectively limit the fault current and reduce the voltage drop at the coupling point of the micro-grid, and also play an active role in stabilizing the power fluctuation of the micro-grid and improving the power quality, thereby improving the ability of the high-permeability micro-grid to deal with external short-circuit faults, guarantee its operational reliability.

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 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 adva...

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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