Distributed maintenance-free intelligent direct current power supply system based on single batteries and control method thereof

Abstract

The invention discloses a distributed maintenance-free intelligent direct current power supply system based on single batteries and a control method thereof. The system comprises at least one group of storage batteries and a distributed maintenance module connected with the storage batteries, the distributed maintenance module is connected with an intelligent control system, and the intelligent control system is connected with the storage batteries through an online bridge connection module and a UPS direct current system. According to the system, the newest power electronic technology and the embedded technology are employed, and a distributed intelligent charging, discharging, and monitoring integrated module is developed; determination of failed batteries, online bridge connection of failure batteries, and online capacity checking are realized; the conventional mode of a direct current cabinet, battery tour inspection, and manual regular maintenance is replaced by the extensible distributed module and a unified background; the conventional mode of regular checking of the capacity of the storage battery and discharging and charging maintenance is changed, and a technical realization method of the intelligent direct current power supply system for distributed online monitoring, online balanced maintenance, online activation, online capacity checking, online bridging of the failure batteries, and data remote transmission monitoring of the single batteries is provided.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of on-line monitoring and maintenance of storage batteries in substations, and relates to a distributed maintenance-free intelligent DC power supply system based on single batteries and a control method thereof. [0003] 【Background technique】 [0004] In the power industry, in order to ensure the safety and normal operation of the power system, a large number of relay protection systems, various automation systems, communication systems and various information management systems have been installed, and the reliability of these systems has been raised with the development of the power grid. higher requirements. In order to ensure that these systems can function normally, the uninterruptible power supply system (DC system or AC system) has become a hot spot of people's attention and research. The energy core that constitutes the DC power system is the battery. Under normal operating conditions, the battery o...

AI Technical Summary

Problems solved by technology

[0007] (1) The long-term operation of the battery pack will further increase the parameter difference between each battery;

[0008] (2) Only the charging cabinet can charge the entire battery pack uniformly; due to the existence of differences in capacity and internal resistance among the batteries, charging the entire pack may easily lead to unbalanced voltages of the individual cells. Charging slowly vulcanizes, and some batteries lose water due to long-term overcharging

[0009] (3) The old and new batteries cannot be shared, and when the battery parameters are seriously inconsistent, the entire set of batteries must be replaced, which is not only wasteful, but also causes environmental problems;

[0010] (4) The failure of a single battery will cause the failure of the entire battery pack;

[0012] (6) It is necessary to carry out maintenance activation discharge on a regular basis, etc.

Regular activation maintenance consumes manpower, material resources and time

Images