Direct-current power supply system

Abstract

The invention discloses a direct-current power supply system which comprises a direct-current power supply device I, a direct-current power supply device II, a direct-current power supply device III, a first bidirectional DC / DC converter, a second bidirectional DC / DC converter, a first direct-current bus and a second direct-current bus. According to the invention, a plurality of direct-current power supply devices are mutually physically isolated and do not interfere with each other; a circulating current risk caused by parallel connection does not occur at any time, and the safety and the reliability of a direct-current power supply system are greatly improved; a plurality of direct current power supply devices and the bidirectional DC / DC converter can form a plurality of power supply paths, so that a plurality of standby power supply paths are provided for a plurality of loads, direct and indirect cost losses caused by faults are reduced, and sharing and maximum utilization of the direct current power supply devices are realized; and according to the invention, remote control can be realized, so that the workload caused by manual on-site operation in the prior art is avoided, and the labor cost is further reduced.

Description

technical field [0001] The invention relates to the field of DC power supply equipment, in particular to a DC power supply system. Background technique [0002] The DC power supply equipment in the substation is a power supply equipment that can provide DC power to various equipment and can be operated independently. It can provide certain protection for switch control, emergency lighting, signal equipment, and system monitoring. It is usually not affected by the system. influence on the way it operates. If the external AC power of the system is suddenly interrupted, the battery can be used to supply power to the DC power supply equipment, so that the system can operate normally. Since the battery pack is connected in series, its performance and life are difficult to predict. If a single battery cell is open or fails, the entire battery pack will lose its backup capability. Once the battery pack fails or there is a circulating current between two DC power supply equipment ...

AI Technical Summary

Problems solved by technology

The two sets of DC power supply equipment are connected through a bus tie switch, and when necessary, the knife switch is closed by manual operation for mutual backup. During the closing process, the two sets of batteries will be connected in parallel for a short time, causing the risk of circulation, and manual on-site operation is required , it is impossible to realize remote automatic operation and real-time backup. Some substations try to use electric control bus tie to realize remote control, but once the electric control switch fails, the direct parallel connection of two sets of batteries will increase the probability of the above risks

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