Noise power estimation device during electrical parameter metering process

Abstract

The present invention discloses a noise power estimation device during the electrical parameter metering process. The device comprises a waveform processing module, a signal compensation module and a noise power estimation module. The waveform processing module is used for sampling an analog signal, converting the analog signal into a first digital signal and outputting the first digital signal to the noise power estimation module. The noise power estimation module is used for converting the first digital signal into a second digital signal and outputting the second digital signal to the signal compensation module. The signal compensation module is used for subjecting the signal components of the second digital signal to the synchronous tracking and the reverse-phase compensation so as to generate a third digital signal and outputting the third digital signal the to the noise power estimation module. The noise power estimation module is used for estimating and metering the average power of the noise according to the third digital signal. According to the technical scheme of the invention, the key component of the noise is extracted by utilizing a signal itself, and then the average power of the noise is estimated. Through the adaptive estimation and the compensation of the signal waveform, the dependency of the noise power estimation on the signal strength is reduced. The precision of noise power estimation is improved. The metering performance of small signals is improved.

Description

technical field [0001] The invention relates to a noise power estimation device in the electric parameter measurement process, in particular to an adaptive noise power estimation device in the electric parameter measurement process. Background technique [0002] With the rapid development and popularization of grid intelligence, electricity metering at smart grid terminals has also put forward higher and higher requirements. In addition to the continuously enhanced communication, information processing and rich application capabilities, as its basic function, intelligent electrical parameter metering The primary impact is the substantial improvement of measurement accuracy or performance. For example, achieving a measurement accuracy of 1 / 10000 within a signal dynamic range of 1 / 10,000 has become a reality, and this has become a focus of many manufacturers. The improvement of metering performance is a systematic project, spanning analog circuits, digital circuit design and d...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a device for estimating noise power in the process of electrical parameter measurement in order to overcome the defect of insufficient signal adaptability of the noise estimation method in the electrical parameter measurement process in the prior art

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