System and method for accurately measuring battery properties of power distribution terminal

Abstract

The invention discloses an apparatus and method for accurately measuring battery properties of power distribution terminal. The system includes a sine AC current source, a first blocking capacitor, a voltage sampling unit, an A / D converting unit, a D / A converting unit, a relay, an electronic load and a controller. The controller is connected to the sine AC current source through the D / A converting unit. The sine AC current source is connected to a to-be-tested battery through the first blocking capacitor. The voltage sampling unit is connected to the to-be-tested battery and is connected to the controller through the A / D converting unit. The to-be-tested battery is connected to the controller through the A / D converting unit. The controller is connected to the electronic load through the D / A converting unit. The electronic load is connected to the to-be-tested battery through the relay. The method includes the following steps: measuring the AC internal resistance and / or the DC internal resistance of the to-be-tested battery; measuring the capacity of the to-be-tested battery. According to the invention, the apparatus and the method not only can measure the internal resistance of the battery, but also can measure the capacity of the battery, can conduct comprehensive and accurate estimation on the battery properties and has high measuring precision.

Description

technical field [0001] The invention relates to the technical field of power distribution network, in particular to a system and method for accurately measuring the performance of a power distribution terminal battery. Background technique [0002] The power distribution terminal is an important part of the construction of distribution automation. It is mainly used in 10kV overhead lines to complete the operation detection and monitoring functions of the distribution lines, and to realize the on-off substations, ring main unit, and pole-mounted switches of the 10kV / 20kV distribution network. , Real-time monitoring of primary equipment such as distribution transformers and capacitors. The power distribution terminal collects real-time operation data of the distribution network, detects and identifies faults, and the operating conditions of the switchgear for processing and analysis. Through wired / wireless communication and other means, upload information and receive control c...

AI Technical Summary

Problems solved by technology

[0007] In addition, there is no mention of the magnitude of the AC current source in the prior art, that is, the small current magnitude makes the battery voltage drop small, and the small voltage is easily disturbed, which increases the difficulty of signal sampling and processing in the subsequent stage, thereby affecting the measurement accuracy of internal resistance

[0008] In short, the accuracy of battery internal resistance measurement according to the existing technology is not ideal enough

Moreover, it is impossible to accurately calculate the battery capacity only by measuring the internal resistance, that is, it is impossible to make a comprehensive and accurate evaluation of the battery performance.

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