Phasor measurement accuracy assessment method and assessment apparatus for synchronized phasor measurement unit

Abstract

The invention discloses a phasor measurement accuracy assessment method and assessment apparatus for a synchronized phasor measurement unit. The phasor measurement accuracy assessment method for a synchronized phasor measurement unit includes the following steps: according to synchronous recording data and synchronous phasor measurement data, acquiring a fundamental wave reconstruction waveform so as to obtain a residual error waveform; acquiring an in-band signal to noise ratio and an outband signal to noise ratio of the residual error waveform; by means of the in-band signal to noise ratio and the outband signal to noise ratio, respectively acquiring the uncertainty of synchronous phasor measurement and the signal to noise ratio of a power grid sampling signal; according to the input standard signal source setting, the in-band signal to noise ratio and the outband signal to noise ratio, obtaining the phasor measurement error caused by fundamental wave and interference; and acquiring the comprehensive assessment result about system measurement accuracy. The phasor measurement accuracy assessment method can realize on-line estimation of the uncertainty of synchronous phasor measurement when a PMU (Phasor Measurement Unit) is running normally, and can realize accuracy verification of the PMU by means of combination of a medium accuracy standard test signal source during the process of testing the PMU performance, thus improving the reliability and accuracy of assessment.

Description

technical field [0001] The invention relates to the technical field of electromagnetic measuring instruments, in particular to a phasor measurement accuracy evaluation method and evaluation device of a synchronized phasor measurement unit. Background technique [0002] PMU (Phasor Measurement Unit, synchronized phasor measurement unit) is called the infrastructure of the smart grid, and the PMU-based WAMS (Wide Area Measurement System, Wide Area Measurement System) plays an increasingly important role in the monitoring, control and protection of power grids. more important role. Continuous and reliable data provided by PMU is the prerequisite for WAMS to carry out various applications. In order to ensure the reliability of the PMU measurement data, on the one hand, the PMU must be calibrated before deployment, and it needs to be checked regularly during use to confirm that it is in a normal state; on the other hand, if the quality of the measurement data can be evaluated on...

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Problems solved by technology

However, this idea has obvious defects. When the observed signal contains interference such as harmonics and noise, the value of the residual SNR is mainly determined by the interference and cannot reflect the size of the error.

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