A DC power supply system for substation and its control method

Abstract

The invention provides a direct current power supply system for a transformer substation and a control method thereof. The direct current power supply system comprises a centralized monitoring module, a direct current operation power module, an uninterruptible power supply (UPS) power module, an inversion power supply module, a communication power supply module and a lithium iron phosphate energy storage module; each module of the direct current power supply system is connected to a common direct current bus through a relay switch, and redundancy backup of each module is realized in a mode that each module is connected in parallel to the common direct current bus through a multi-submodule; the modules of the direct current power supply system are connected with the centralized monitoring module through a controller area network (CAN) communication bus; the centralized monitoring module collects the running state information of each module and manages the modules of the system uniformly; and a battery is charged or discharged slightly through intelligent coordination control, and on-line automatic maintenance of the battery is realized. The invention has the advantages that: the system has high reliability, high shock load resistance, no maintenance, small floor area, energy conservation and environmental friendliness; and the service life of the battery is prolonged and the performance of the battery is improved by the intelligent coordination control method.

Description

technical field [0001] The invention relates to an electric power supply system and its control method, in particular to a DC power supply system for a substation based on a lithium iron phosphate battery and its control method, which is suitable for online automatic maintenance-free control of a DC power supply system for a substation. The system is mainly used for It is used in various substations or switch stations such as power plants, hydropower stations and industrial enterprise power distribution, and can also be extended to DC power supply systems for communication base stations or buildings. Background technique [0002] The DC operating power supply, UPS power supply, inverter power supply, and communication power supply in the existing station DC power supply system are all equipped with their own backup batteries, and the batteries basically use valve-regulated lead-acid batteries. It has been significantly improved, but there are still defects such as low energy...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is: the present invention applies the lithium iron phosphate battery to the DC power supply system for the substation, solves the problems of the battery occupying a large area and serious waste pollution in the existing DC power supply system for the substation, and adopts an intelligent coordination control algorithm at the same time Solve the problems of long-term floating charge of lithium iron phosphate battery to shorten the service life and real automatic online maintenance

Images