A PMU for the Measurement of Synchronized Harmonic Phasors in Three-Phase Distribution Networks

Abstract

Owing to the extension of electric distribution networks, monitoring and control issues rely on large-scale distributed measurement systems, which are able to carry out simultaneous measurements of electrical quantities in several points of the monitored systems. In this paper, the implementation of digital procedures that are suitable for the evaluation of the synchronized harmonic phasors in a flexible phasor measurement unit (PMU) based on PXI modular hardware is presented. The results of the experimental tests are shown to characterize the measurement system to evaluate the behavior of the designed instrument under real operating conditions on three-phase electric distribution networks

An ECSIT‐centric view of Alzheimer's disease (Comment on DOI 10.1002/bies.201100193)

“…In order to experimentally evaluate the metrological performance of the proposed synchronization system, an ad hoc laboratory setup has been used. The system is constituted by PMUs designed by the authors and presented in previous works 12, 15, 16.…”

“…In particular, this work studies a mixed structure able to combine the worldwide availability of GPS with the excellent accuracy of the modern synchronization systems based on PTP and designed for communication networks. The considered application field is the measure of synchrophasors and harmonic synchrophasors 12–14. Commercial devices are mainly focused on phasors at fundamental frequency, whereas inadequate attention is paid to the measurement of harmonic quantities.…”

Harmonic PMU Algorithm Based on Complex Filters and Instantaneous Single-Sideband Modulation

“…Proliferation of non-linear loads along with the growth of distributed generation systems are some of the main causes of power quality problems related to harmonic pollution in modern power systems [1]. This pollution compromises the system reliability, e.g., producing additional losses in transmission or distribution lines, overheating of electrical machines and relays breakdowns [2,3]. At the same time, the development of new power system topics, such as smart grids and renewable energies, increases the requirements of methodologies for power quality monitoring [4][5][6][7], including the analysis of both the fundamental component and the harmonic components [8].…”

“…Regarding the harmonic synchrophasor implementations, few strategies have been presented. For instance, in [2,12], the FT and a zero-crossing technique is used to calculate the fundamental and harmonic components, in which unreliable results can be obtained when a frequency fluctuation appears. In [18], an improved FT version is presented where several windows to reduce the spectral leakage are compared; besides that, it uses a curve fitting approach with fundamental frequency information for estimation of the harmonic phasors.…”

Estimating the Frequency Coupling Matrix From Network Measurements

“…In this paper, we estimate the FCM and line admittances from PMU measurements. Signal processing tools such as the fast Fourier transform can be used to decompose the voltage and current measurements into fundamental and harmonic phasors [23]- [25]. The maximum harmonic order K depends on the sampling rate of the PMU.…”