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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Optical isolators and optical current transducers are both based on Faraday magneto-optical effect. This paper study the feasibility of modifying optical isolators for a modified new type of electrical current measurement. The modification method is introduced at first, then the parameters measurement and calculation method are discussed. Preliminary experimental tests have been carried out to test...
Recent developments of variable frequency applications have accelerated the demand to look at the measurement technology on variable frequency signals. Most low voltage (LV) circuit breakers are designed to operate at a fixed frequency. Therefore, it is necessary to propose a variable-frequency measuring concept for LV protection devices. In this paper, we propose a novel combined alternate current...
Harmonics identification in distribution systems has always been a difficult task, due to the variety of the loads, more and more often nonlinear and unbalanced, and the spread of the harmonics along the grid. Typically, few real measurements are available in distribution systems, commonly in the HV-MV substations, whereas monitoring of power quality phenomena requires specific methodologies and measurement...
The definition and the method to characterize a rapid voltage change (RVC) are defined in the standard IEC 61000-4-30. Other standards, such as IEC 61000-3-7, IEC 61000-2-12 or EN 50160, limit the number and magnitude of RVCs for compatibility level or for planning levels in medium and low voltage public supply systems. Those limits control the effect of RVCs on light flicker. This work analyses the...
Phasor measurement units (PMUs) are the key measurement devices of modern power networks monitoring systems. The high accuracy and fast reporting rates required for PMU implementations ask for improvements in both hardware and software solutions. Depending on the characteristics of the monitored voltages and currents, the accuracy of PMU algorithms may represent the main contribution to the overall...
This paper deals with the problem of synchronizing phasor measurements in different nodes of a power network. Usually, this issue is faced by using a synchronization signal provided by wired or wireless communication infrastructure. As it is well known, the most common implementation of such a solution is the so-called Phasor Measurement Unit (PMU) which relies on a time reference signal coming from...
Power quality (PQ) analysis requires to calculate a lot of different parameters (e.g. unbalance, THD, harmonic powers, harmonic impedances, …) based on measured voltages and currents (fundamental and harmonics). Respective standards and data sheets of measurement equipment define the measurement accuracies only for these measured quantities. The resulting uncertainty of parameters derived from these...
A new method is developed for synchrophasor-based determination of three-phase transmission line impedance parameters, applicable for both fully transposed and untransposed transmission lines. The method is based on accurate time-synchronised measurements of the voltage and current phasors at both ends of the transmission line. The method estimates the line impedance values using a robust estimator...
The proliferation of estimation algorithms for Phasor Measurement Units (PMUs) makes performance analysis and comparison between different techniques a challenging task. This paper presents a testbed conceived to perform a flexible and accurate characterization of different estimation algorithms in various testing conditions reported in the IEEE Standard C37.118.1-2011 and its Amendment C37.118.1a-2014...
This paper describes the design and setup of different measuring systems for the calibration of commercial voltage and current transformer test sets for non-conventional instrument transformers. The calibration systems are recently developed at the national metrology institutes VSL, PTB, METAS and TUBITAK within the frame of the European project “FUTURE GRID — Non-conventional voltage and current...
Several applications, such as phasor measurements in Phasor Measurement Unit (PMU), require to retrieve only one spectral component of the whole signal. In such situations, the classical DFT and FFT algorithms may become computationally inefficient and several alternative methods have been proposed to measure a single spectral component in an efficient way. This paper proposes a modified Taylor-Fourier...
Distribution system operators (DSOs) require accurate knowledge of the status of the network in order to ensure the continuity and quality of power supply. In this context, the National Physical Laboratory (NPL) and the Power Network Demonstrations Centre (PNDC) have been working together in the development and validation of optimal sensor placement and network topology estimation algorithms. This...
During the last years, the installation of Distributed Energy Resources (DERs) and the expected diffusion of Electrical Vehicles (EVs), is increasing the complexity of the distribution grid, making the management of the grid operated by Distribution System Operators (DSOs) more difficult. The Smart Grid approach tries to provide a response to these troubles, by means of a strong interaction between...
During the last few years, Smart Electricity Meters have been deployed in several countries all around the world, replacing the trustable Electromechanical meter and even other electronic meters. Since the early deployments, many concerns and complaints from customers which do not trust Smart Meters accuracy have appeared. As a result, researchers of different institutions have been testing electricity...
The most recent estimation algorithms for Phasor Measurement Units (PMUs) rely on increasingly complex signal models. The rationale of this general approach is that such models can support algorithms able to estimate not only amplitude, phase, frequency and rate of change of frequency (ROCOF) of the waveform fundamental component, but also the parameters of possible disturbances, thus reducing their...
Harmonic emission assessment in a distribution network with existing background voltage harmonics is a challenge for Renewable Power Producers (RPP) aiming to achieve grid code compliance. Dynamic interaction of harmonic sources at a Point of Common Coupling (PCC) renders the general summation law in IEC 61000-3-6 impractical, as harmonic phasors do not conform to the addition of rms values using...
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