Direct-current microgrid and coordinated operation method thereof

Abstract

The invention relates to a direct-current microgrid and a coordinated operation method thereof. The invention belongs to the technical field of direct-current distribution networks. The direct-currentmicrogrid comprises a direct current energy storage system, a new energy direct-current power generation system, a bidirectional direct-current charger and a controller. The controller is used for controlling the coordinated operation of the direct-current microgrid. When the power generation amount of the new energy direct-current power generation system cannot meet the load power consumption inthe isolated grid operation process of the direct-current microgrid, the direct-current energy storage system is switched on. Meanwhile, the direct-current energy storage system is controlled to serve as a discharging power supply. When the battery remaining capacity of the direct-current energy storage system is lower than a set lower limit value, the direct-current energy storage system is in adischarging state and the maximum output of the new energy direct-current power generation system is smaller than a power supply load, the bidirectional direct-current charger is switched on to serveas a discharging power supply. The direct current microgrid can realize the coordinated operation among the direct current energy storage system, the new energy direct current power generation systemand the bidirectional direct current charger during isolated grid operation. The power supply switching control is reliable, and the stable and uninterrupted power supply of loads can be ensured.

Description

technical field [0001] The invention belongs to the technical field of direct current distribution networks, and in particular relates to a direct current microgrid and a coordinated operation method thereof. Background technique [0002] In recent years, with the increasingly prominent energy demand and environmental problems, distributed power generation based on clean energy has received extensive attention, and microgrids have also emerged as a result. Microgrids are mostly AC-based, but DC microgrids have a simple system structure, small energy conversion, and high power supply quality, which is more advantageous than AC microgrids. With the development of power distribution system, DC microgrid has attracted more and more attention. Due to the intermittent and random nature of the output power of renewable energy, the DC energy storage system has become an important part of the DC microgrid and has important research significance. [0003] The DC microgrid is current...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a DC microgrid and its coordinated operation method, which is used to solve the problem that the existing DC microgrid cannot perform reliable power switching control

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