Storage battery performance on-line monitoring system and monitoring method

Abstract

The invention discloses a storage battery performance on-line monitoring system and a storage battery performance on-line monitoring method. Each storage battery on-line monitoring unit comprises an acquisition unit, an internal resistance measuring unit and a communication unit; batteries in a storage battery pack are divided into a plurality of units; a load and the batteries in each unit form a closed-loop circuit, and the batteries are discharged; the acquisition unit acquires discharging parameters of each battery; the internal resistance measuring unit calculates the internal resistance of each battery according to acquired information and uploads the internal resistance to the communication unit; the communication unit accesses a local area network and transmits data to a server; after receiving the data, the server analyzes, processes and stores the data; the data are published in a webpage form through a built-in web publishing function; and a computer in the local area network checks the situation of each storage battery pack by accessing a webpage. By adoption of a multi-cycle on-line testing method, safety and reliability are realized, the discharging internal resistance is tested in a grouped mode, and during test, safety operation of a power system is not influenced. The invention has the advantages of stable and accurate test result and convenient testing process.

Description

technical field [0001] The invention relates to an online battery performance monitoring system and a monitoring method, belonging to the technical field of substation detection. Background technique [0002] At present, the user's monitoring of the substation battery is mainly to monitor the voltage of the battery, but because most of the battery is in the floating charge state, the battery inspection instrument only measures the floating charge voltage of the battery. This parameter is very important for judging the performance of the battery. limited. like figure 1 Shown is an actual test example, the voltage measured by the No. 3 battery during floating charging is within the normal range, but its internal resistance is measured and found to be far from the standard range, such as figure 2 , Do check discharge and find that its capacity is lower than 80% of the nominal capacity. [0003] The most accurate way to evaluate the performance of the battery is to conduct a...

AI Technical Summary

Problems solved by technology

[0010] Due to the voltage change during the float charge to discharge process, it is necessary to select a stable area to calculate the voltage change amplitude. In actual measurement, the repeatability of the data obtained by this method is poor.

The discharge of the whole group has a great impact on the DC system, especially for batteries with a certain number of years. After the battery has been used for several years, the performance of some batteries will inevitably decline. When the discharge of the whole group and the discharge current is large, the performance of the battery with the worst performance Several batteries are easily damaged by over-discharge

[0011] No automatic measurement: It is inconvenient to realize automatic measurement by connecting the switches in series; when measuring the internal resistance, the air breaker must be operated, and the air breaker must be closed by a person on site

[0012] Poor safety and inaccurate measurement: Due to the series connection of switches and the addition of diodes, there is a problem of step-by-step coordination in terms of safety. If it is disconnected during a large current impact, it will cause a major accident

Moreover, the quality of the selected products and the on-site construction technology both increase the unreliability of the normal use of the monitoring products and the original monitored objects, and there are hidden dangers

[0013] In addition, since the discharge adopts a pure resistive load, the discharge current is different for different group voltages, which will cause inaccurate measurement

In the actual application process, the measurement error is as high as 100% or more by this method

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