Direct-current micro-grid battery energy storage energy management method, management equipment and storage medium

Abstract

The invention relates to a direct-current micro-grid battery energy storage energy management method, management equipment and a storage medium, which are applied to a direct-current micro-grid, the direct-current micro-grid comprises a grid-connected inverter, a photovoltaic power generation device, a direct-current load and a battery energy storage device, and when the direct-current micro-grid is in an isolated grid state, a first control strategy is executed; when the direct-current micro-grid is in a networking state and the absolute value delta Vdc of the voltage fluctuation amplitude of the direct-current bus is greater than or equal to a first fluctuation amplitude threshold value, a second control strategy is executed; and when the direct current micro-grid is in a networking state and the absolute value delta Vdc of the fluctuation amplitude of the direct current bus voltage is smaller than the first fluctuation amplitude threshold value, a third control strategy is executed. According to the invention, through adjustment of bus voltage and energy storage SOC control of the direct current micro-grid in different operation modes, the coordination control requirement of a distributed power supply interface converter under island and grid-connected operation is considered, and the provided method can enable the direct current micro-grid to keep stable operation even under the fault condition.

Description

technical field [0001] The present invention relates to the technical field of DC microgrid, in particular to a DC microgrid battery energy storage energy management method, management equipment, and a computer-readable storage medium. Background technique [0002] In recent years, due to the increase of greenhouse gas emissions and energy demand, environmental issues have attracted increasing attention, and microgrids have become a sustainable solution to such problems; microgrids have the advantages of low operating costs, high operating efficiency, and high power quality; among them , compared with AC microgrids, DC microgrids can effectively integrate distributed power into the grid, so it has received extensive research and attention; in addition, the disadvantages of AC microgrids, such as complex active and reactive power control, Issues such as frequency stability and inefficiency caused by multiple AC-DC conversions do not exist in DC microgrids. [0003] In a DC m...

AI Technical Summary

Problems solved by technology

In previous studies, the focus has been on precise power sharing between distributed sources and loads; however, if the energy of the battery energy storage device is not properly managed, the battery energy storage device in the DC network will face deep discharge and overcharge. risk

In addition, most of the existing DC microgrid energy management methods do not consider the transient response of the grid disturbance. However, the voltage regulation of the DC grid requires energy storage to participate in the system voltage stability.

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