Electrical analog acquisition device and impedance adaptive numerical compensation system and method

Abstract

The invention relates to an electrical analog acquisition device. The device comprises an analog board card, at least one functional board card and a backplane which is electrically connected with theanalog board card and the functional board cards separately. The invention further relates to an impedance adaptive numerical compensation system and method. The system comprises an electrification detection module, a signal jump detection module, a logic or module, a signal high-level statistics module and an analog numerical compensation module. Accordingly, a voltage signal of the analog boardcard can be shared by the multiple functional board cards, synchronization of voltage and current acquisition of each monitoring line is guaranteed, the functional board cards are same in configuration, and the cost of production and maintenance is greatly reduced. By automatically detecting the input impedance, the acquired electrical analog values are compensated, and the accuracy of electricalanalog acquisition is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power distribution terminals in stations, in particular to an electrical analog quantity acquisition device and an impedance self-adaptive numerical compensation system and method. Background technique [0002] The power distribution terminal of the station is an important component of power distribution automation. It relies on real-time collection of primary voltage and current signals of the power grid to monitor the working status of multiple 10kV power circuits. Therefore, the real-time and accuracy of electrical analog acquisition are very demanding. high. In a 10kV power distribution automation system, the high-voltage side voltage or current signal is converted into a 220V or 100V large voltage signal (5A current or 1A current signal) by a primary voltage (current) transformer, and the signal is input into the power distribution terminal and then passed through a micro-transformer. The converter ...

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Problems solved by technology

Due to the large number of monitoring channels, there are also many micro-transformers required correspondingly, and the size of the micro-transformers is too large to be concentrated on one circuit board. At present, there are two main ways to solve this problem: one is the transformer Centrally distributed to several circuit boards, and other components such as processors are distributed to other boards, so there are many types of boards, and the production and maintenance costs are high; another method is distributed distribution of transformers, each There are analog-to-digital converters and MCUs on the block transformer board. The analog signals are converted into digital signals by the analog-to-digital converters and then collected to the data processing unit. However, there are differences in the sampling time of voltage and current in this way, and the power distribution terminal It is not only necessary to monitor the voltage and current status of the monitored line, but also to calculate the power delivered by the monitoring node. The calculation of power requires that the phases of the voltage signal and the current signal are strictly synchronized, otherwise the calculation result will be inaccurate

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