Wireless phasor measurement device and method based on adaptive noise cancellation algorithm

Abstract

The invention proposes a wireless phasor measurement device based on an adaptive noise cancellation algorithm, and the device comprises one or more collectors disposed at phasor collection points of atransformer station, and also comprises a main unit. Each collector comprises a voltage acquisition module, a current acquisition module, and a wireless data transmission module connected with the voltage acquisition module and the current collection module. The main unit comprises a dual-channel EMI receiver, an AD converter and a DSP data processing unit, which are connected in sequence. The two channels of the dual-channel EMI receiver are respectively connected with an antenna A and an antenna B. The DSP data processing unit processes the data which is received by the dual-channel EMI receiver and converted by the AD converter through employing the adaptive noise cancellation algorithm. The antenna A receives sampling signals of the collectors and a signal of the joint effect of the background noise. The antenna B receives the background noise signals. The device reduces the workload of the relay protection personnel in the work of measuring the phasor with a load, and effectivelyeliminates the influence of strong electromagnetic interference of the substation on the data transmission of a wireless phasor analyzer.

Description

Technical field [0001] The invention belongs to the technical field of substation wireless load phasor measurement and analysis, and in particular relates to a wireless phasor measurement device based on an adaptive noise cancellation algorithm. Background technique [0002] The load-bearing phasor measurement analysis of the substation includes phase sequence and phase detection and analysis. In the existing scheme, generally, a collector is set at the phasor measurement point of the substation, and the measurement antenna A is placed at a certain distance d in front of the collector and connected to the A channel of the dual-channel receiving host through a cable, which is responsible for receiving from the acquisition. The signal combined with the background noise. The measurement antenna B is placed at least 10d away from the collector, connected to the B channel of the dual-channel receiving host, and is responsible for receiving the signal from the collector and background...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of this scheme are: (1) It is easily affected by the site environment

Due to the possible blockage of buildings and the long distance between the measuring antenna and the measuring receiver, it is very inconvenient to use a transmission cable to connect

(2) Large attenuation

The transmission loss of the cable may make the measurement receiver unable to accurately measure the measured signal, thus affecting the background noise removal result and the final radio interference field strength measurement value

(3) The wiring is cumbersome, which is not conducive to on-site operations

Corona discharge generates high-frequency pulsed current, which will cause strong electromagnetic interference to the radio communication in the station. In this case, the above-mentioned existing technical solutions are even worse, and often cannot achieve the required accuracy of measurement

[0005] On the other hand, the load phasor measurement and analysis of substations often requires the measurement of phasor information of multiple measurement nodes at the same time. If the above-mentioned existing technical solutions are used, it is impossible to ensure that the phasor information of multiple nodes or equipment The synchronization of time in the measurement is currently generally solved by multiple operation and maintenance personnel recording the data of each node separately, and finally summarizing and analyzing it. However, this processing method is not only time-consuming and labor-intensive, but also has low accuracy.

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