Non-floating charging type substation direct current power supply system based on iron lithium battery

Abstract

The invention discloses a non-floating charging type substation direct current power supply system based on an iron lithium battery. The positive output end and the negative output end of a high-frequency switch charging module are respectively connected with a positive pole and a negative pole of a direct current bus; the positive pole and the negative pole of an iron lithium battery group are connected with the positive pole and the negative pole of the direct current bus by a fourth air switch K4; a plurality of output branches are connected in parallel on the positive and negative poles of the direct current bus; a plurality of high-frequency switch charging modules are connected in parallel; each high-frequency switch charging module is connected with a monitor with a model of BMJ-FPC; an insulated monitoring device is connected with the monitor; and the output end of a current transformer (CT) which is arranged on each output branch is connected with the insulated monitoring device. According to the system, the iron lithium battery group realizes hot spare and automatic power supply in a non-floating charging mode, and the system has the characteristics that the service life of power supply equipment is prolonged, the safety performance is improved, and the degree of automation is improved.

Description

technical field [0001] The present invention relates to a direct current power supply system for power system substations, specifically a battery pack based on the performance characteristics of ferrous phosphate lithium ion battery pack, which adopts battery pack charging and discharging circuits and corresponding control and protection devices to keep the iron lithium battery pack in a non-floating state. A DC power system for substations with charging but not offline operation. Background technique [0002] The DC power supply for power system substation is the working power supply for protection, control and communication of power transmission and transformation equipment. When the AC power supply is interrupted due to a grid accident, its battery pack is used for accidents such as substation protection, control, and accident lighting. The power system substation has always adopted the online floating charging operation mode of the battery pack, mainly: ① To supplement t...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a non-floating substation DC power supply system based on iron-lithium batteries based on the characteristics that lithium iron phosphate batteries are not suitable for floating charging operation, aiming to solve the problem caused by long-term floating charging of iron-free lithium batteries. The problem of capacity decline and life reduction of the

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