Storage battery online monitoring system and method for measuring internal resistance of storage battery

Abstract

The invention discloses a technical solution of a storage battery online monitoring system. The real-time monitoring in a condition where a storage battery pack works normally is implemented, the on-site and remote real-time display for performance parameters of the storage battery are supported, the data of the storage battery are kept and analyzed, and the overall performance of the storage battery is comprehensively evaluated; a cross-grouped measurement method for the internal resistance of the storage battery is proposed, so that the influence of an internal resistance of a lead wire to the monitoring of the internal resistance of the storage battery is basically eliminated and the measurement precision is improved; a multi-approach fault alarm mode is implemented; once the storage battery is found to have a fault, a site monitoring terminal sends out a sound-light alarm, and sends a serial number of a faulty battery to a mobile terminal via a mobile internet; and meanwhile, an upper computer also can see alarm information of the storage battery.

Description

technical field [0001] The invention relates to an on-line monitoring system for storage batteries used in the field of substations and a method for measuring the internal resistance of storage batteries. Background technique [0002] The battery is used as the backup power source of the substation DC system, and its reliable operation plays an important role in the stability of the DC system. At present, the periodic maintenance strategy is generally adopted for batteries, but there are the following defects: (1) A power outage test is required, and the workload is relatively large. According to the regulations, the operation and maintenance inspection items of the battery include: measuring the floating charge voltage every month, and measuring the internal resistance of the cell every three months , Carry out a checking discharge test every two to three years, and conduct a checking discharge test every year if the operating time exceeds 6 years; (2) The parameters of the...

AI Technical Summary

Problems solved by technology

At present, the periodic maintenance strategy is generally adopted for batteries, but there are the following defects: (1) A power outage test is required, and the workload is relatively large. According to the regulations, the operation and maintenance inspection items of the battery include: measuring the floating charge voltage every month, and measuring the internal resistance of the cell every three months , Carry out a checking discharge test every two to three years, and conduct a checking discharge test every year if the operating time exceeds 6 years; (2) The parameters of the battery under maintenance are inconsistent with those in operation, and it is difficult to reflect all defects. Traditional batteries The acquisition accuracy of the detector is not high, the alarm function is single, and the maintenance personnel cannot grasp the performance of the battery in real time; (3) The maintenance cycle of the battery must exist within the interval between two maintenance cycles

The faults found in periodic maintenance must have existed for a period of time, and periodic inspections cannot detect battery faults in time; (4) Periodic inspections cannot find serious faults in some batteries; (5) Periodic inspections ignore equipment status to formulate maintenance plans, which is easy Cause waste of manpower and material resources, or over-maintenance

The data collected by traditional maintenance technology is scattered and discontinuous, and it is impossible to macroscopically analyze the historical data of the battery over a period of time, and it is impossible to form an evaluation system

[0003] In the existing battery online monitoring technology, the monitoring information is not perfect, and the wire error in the monitoring process is large, which leads to inaccurate internal resistance monitoring, which leads to inaccurate evaluation of the overall performance of the battery

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