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Knowledge of real-time impedance parameters of overhead lines can significantly enhance power system monitoring and control applications such as dynamic line rating and fault location. To ensure high accuracy of the determined parameters, methods for error detection and correction are required. In this paper the impact and correction of systematic errors in the voltage phasors are considered and corrected...
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AMPS 2015, sponsored by the IEEE Instrumentation and Measurement Society and organized by the TC39 "Measurements in Power Systems", is the 6th edition of the international workshop on Applied Measurements for Power Systems. It is primarily focused on the analysis of measurement issues in modern electric power networks as well as on encouraging discussion among experts coming from academia,...
The increasing interest versus the employment as measuring transformer of air-core current transformers, such as for example Rogowski coils, is mainly due a combination of factors: linearity, bandwidth, no saturation, small size, lightweight. International standard are therefore endorsing specific requirements and the performance of this kind of current sensors must be stressed under different working...
PEM fuel cell (FC) operation is likely to be characterized by voltage dips on time scales shorter than 1 s, arising from temporary flooding of gas channels or porous layers, particularly when the FC is operated at high humidity levels. If supercapacitors are employed together with the FC as energy storage systems, they can make up for the temporary lack of energy produced by the FC. However, the steep...
The development of the smart grid requires new monitoring systems feasible to support automation functionalities as control of DER. As the key element in the monitoring system, the real time distribution system state estimation (DSSE) integrated with bad data processor is presented in this work. The developed DSSE is suitable for the real time application because it has the benefits of more computational...
The paper presents a technique based on the use of single-variable Kalman filters (KFs) to track the frequency variation of signal components in multifrequency phasor analysis. KFbased tracking is employed for accurate frequency estimation of both harmonic and inter-harmonic components in a Compressive Sensing Taylor Fourier Multifrequency (CSTFM) algorithm. This novel approach improves robustness...
Harmonic levels and their propagation in the power system are mainly determined by the network harmonic impedance. It is also an essential parameter for the calculation of harmonic current emission limits. Different methods for measuring the network harmonic impedance have been developed in the last decades, but all of them assume that the impedance is constant within a cycle at fundamental frequency,...
The Phasor Measurement Units (PMUs) are becoming an important element for the measurement systems of the electrical grid. To assure the high penetration of these measurement devices, the interoperability of the PMUs from different vendors must be ensured. The IEEE Standard C37.118.1-2011, with its amendments of 2014, defines two accuracy classes, P and M, and provides the steady state and the dynamic...
Power transformer bushings are among the least reliable components in high voltage systems, therefore the knowledge of their wear condition is very important for a proper network management. The aim of this work is to study the limits of applicability of an on-line monitoring method for transformer bushings previously presented by the authors. The technique allows to continuously estimate the variation...
The quantification of harmonic emission requires an accurate representation of the network harmonic impedances. A number of techniques have been proposed to make the assessment of the network harmonic impedances practical and less invasive. Using actual event data, captured at a solar farm, this paper aims to utilize existing assessment techniques to develop an online network harmonic impedances assessment...
The feasibility of accurate monitoring a high voltage is investigated, which based on measuring a current through a capacitor, which is already installed in the grid. A current clamp based measuring system with high-resolution digitizer was developed. In order to adapt the system for different capacitors, the current clamp sensor is designed for a.c. currents in the rant of 150 μA to 12 A, while the...
Linear Hall IC can be used for the low price openloop Hall Effect current sensor thanks to its high sensitivity. However, according to the experimental results, its thermal performance is greatly related to the thermal drift coefficient of linear Hall IC and the gain of the amplifying circuit. In this paper, the thermal drift of the zero offset will be improved by two methods. One is to use two Hall...
Next-generation Phasor Measurement Units (PMU) must exhibit superior performances in order to meet the accuracy requirements of active distribution grids. Till now most researchers have focused their efforts on mitigating the impact of intrinsic amplitude and phase fluctuations as well as harmonic and inter-harmonic disturbances, since they are usually the largest sources of intrinsic uncertainty...
In this paper we introduce a numeric method to resolve a non-contact voltage sensor equation and track the original voltage in the measured surface for medium and high alternated voltage systems. We introduce the non-contact sensor itself, its principle of operation and equations, and also the method we use to increase the sensitivity of the measurement. The numeric method is then presented in detail,...
In modern power systems, several conducted disturbances and power quality phenomena are commonly experienced also at medium voltage level. Therefore, voltage and current transducers, which scale voltage/current waveforms down to levels compatible with the measuring instruments, are expected to accurately work over a proper range of amplitudes and frequencies, keeping the signal integrity needed to...
The mercury vapor lamp is the oldest high intensity discharge technology lamp that uses an electric arc, and comes in different shapes and designs. It creates a very bright light by using an arc through vaporized mercury in a high pressure tube. This lamp can cause unwanted interference to the smart-grid network or power line communications channel when connected to the channel’s wiring system. In...
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