Energy-storage type alternating current and direct current mixed micro-grid and control method thereof

Abstract

The invention discloses an energy-storage type alternating current and direct current mixed micro-grid and a control method thereof. The energy-storage type alternating current and direct current mixed micro-grid comprises an alternating current micro-grid, a direct current micro-grid, a battery energy-storage system and an energy management system EMS, which are connected with an external grid control center. The control method of the energy-storage type alternating current and direct current mixed micro-grid comprises the following steps of initializing the EMS to acquire information data of the alternating current micro-grid, the direct current micro-grid and the battery energy-storage system; acquiring information data of an external public grid in real time; regulating and controlling the alternating current micro-grid, the direct current micro-grid and the battery energy-storage system according to the acquired data. The energy-storage type alternating current and direct current mixed micro-grid and the control method thereof have the advantages that the energy utilization efficiency can be improved, the size of a transformer can be reduced, networking and controlling are more flexible, the cost is reduced, and the power supply reliability of the whole system is improved.

Description

technical field [0001] The invention relates to an energy storage type AC-DC hybrid microgrid and a control method thereof. Background technique [0002] At present, whether it is in a large-scale power supply system or other micro-grid systems, it is mainly a single micro-grid system of an AC micro-grid or a DC micro-grid. For a single micro-grid system, there are many deficiencies: more and more electrical equipment needs DC power supply. Compared with converting DC to DC through the AC grid, not only the converter equipment is large in size and high in cost, Moreover, the AC conversion efficiency is low and the energy loss is serious; a single AC or DC microgrid has many power conversion devices, large volume, and low reliability of system power supply; at the same time, with the increasing emphasis on energy conservation and environmental protection, solar distributed power generation, elevator energy-saving energy recovery The system, etc. output DC power, which needs ...

AI Technical Summary

Problems solved by technology

For a single micro-grid system, there are many deficiencies: more and more electrical equipment needs DC power supply. Compared with converting DC to DC through the AC grid, not only the converter equipment is large in size and high in cost, Moreover, the AC conversion efficiency is low and the energy loss is serious; a single AC or DC microgrid has many power conversion devices, large volume, and low reliability of system power supply; at the same time, with the increasing emphasis on energy conservation and environmental protection, solar distributed power generation, elevator energy-saving energy recovery The system, etc. output DC power, which needs to facilitate the flexible access of renewable energy; in addition, most micro-grid systems are simple to control and manage, and there is no effective energy control method that fully considers the energy utilization efficiency of the system

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