Power quality monitoring device for power distribution network based on data acquisition card

Abstract

The invention discloses a power quality monitoring device for power distribution network based on a data acquisition card, which comprises a power supply circuit, a voltage and electric current acquisition circuit, a synchronous phase-lock circuit, a signal conditioning circuit, a filter circuit, a programmable control amplifying circuit, a frequency measurement circuit, a data acquisition card and a computer, wherein the voltage and electric current acquisition circuit, the synchronous phase-lock circuit, the signal conditioning circuit and the filter circuit are connected in sequence; the filter circuit is connected with the programmable control amplifying circuit and the frequency measurement circuit respectively; the programmable control amplifying circuit and the frequency measurement circuit are connected with the data acquisition card; the data acquisition card is connected with the computer; and the circuits are also connected with the power supply circuit respectively. Through the adoption of the high-precision multi-channel data acquisition card, the power quality monitoring device, provided by the invention, has the advantages that simultaneous sampling by multiple channels can be realized; the data sampling precision is high; the conversion precision reaches 14 bits; the sampling speed is high; and the highest sampling velocity can reach 2.5 us.

Description

technical field [0001] The invention relates to a power quality monitoring device, in particular to a distribution network power quality monitoring device based on a data acquisition card. Background technique [0002] The power system needs a large number of intelligent terminals for data collection, especially the distribution network system with massive data. Most of the existing power quality monitoring devices on the market are suitable for the main grid with a voltage level of 110kV and above, but there are relatively few power quality monitoring devices designed for the characteristics of the distribution network (mainly referring to the voltage level of 10kV and 0.4kV). The structural characteristics of the distribution network and the main power grid are obviously different. There are a large number of monitoring points and the wiring methods are complex and changeable. In addition, there are many communication methods for intelligent devices in the distribution net...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many types and varieties of electric energy collection devices or meter reading systems on the market, but most of these products have the following shortcomings in the actual application of distribution networks: 1) Most products can only complete the measurement of a single measurement point, and cannot Real-time collection of multiple electric energy data from multiple monitoring points; 2) Data sampling accuracy and speed are limited; 3) Mainly designed for the main power grid, the cost is high, and it is not suitable for large-scale promotion and application in the distribution network; 4) Communication means It is relatively simple, which is not conducive to the realization of networked monitoring of distribution network power energy

Images