Tag Archives: power quality

944–960 N. Shabbir, L. Kütt, M. Jarkovoi, M.N. Iqbal, A. Rassõlkin and K. Daniel
An overview of measurement standards for power quality
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An overview of measurement standards for power quality

N. Shabbir*, L. Kütt, M. Jarkovoi, M.N. Iqbal, A. Rassõlkin and K. Daniel

Tallinn University of Technology, School of Engineering, Department of Electrical Power Engineering & Mechatronics, Ehitajate tee 5, 19086, Tallinn, Estonia
*Correspondence: noshab@taltech.ee

Abstract:

Power Quality (PQ) is a vital aspect of electrical power systems, which cannot be neglected anymore, as an ample PQ guarantees the essential compatibility between consumer equipment and the electricity network. The analysis of electrical parameters related to distributing electricity is recognized as a complex engineering problem. It remains a critical task to maintain and improve PQ in modern evolving networks as the overall system performance highly depends on it. Future smart grids will also require a further increase in PQ levels in terms of observability, affordability, data exchange, flexibility, and net metering, thus making the network much more complex as it will be featuring a large amount of variable renewable-based distributed generation. This will further require the need for the introduction of novel, efficient and intelligent monitoring, control, and communication systems with various demand manageable resources. In this paper, a review and comparisons have been made for different IEEE and IEC measurement standards that are used for PQ with a specific focus on harmonic distortion as it is one of the most important parameters in PQ and some guidelines have been suggested for future electricity networks.

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2639–2652 T. Vinnal, H. Puusepp, N. Shabbir, L. Kütt and M. N. Iqbal
Case study of non-linear PV inverter devices attached to the LV distribution network
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Case study of non-linear PV inverter devices attached to the LV distribution network

T. Vinnal, H. Puusepp, N. Shabbir, L. Kütt and M. N. Iqbal

Tallinn University of Technology, School of Engineering, Department of Electrical Power Engineering and Mechatronics, Ehitajate tee 5, EE19086 Tallinn, Estonia.

Abstract:

Every year, more and more solar power plants are connected to the grid, producing electricity in an environmentally sustainable manner. The increasing number of photovoltaic (PV) installations and their integration into the low voltage (LV) distribution network (DN) is having an impact in terms of power quality (PQ). For example, the voltage in the DN can sustain high distortion values. The impact of a PV installation on the LV network is analysed in this research. The field measurements were carried out over a 3-week period at a solar power plant with a total output power of 160 kW in an Estonian rural municipality. The measurement results provide the opportunity to look more closely at the effect of the solar power plant on the supply voltage of the LV DN. Parameters such as voltage variation within a one-minute period, the asymmetry of the voltages and the total harmonic distortion of the voltages are discussed here.

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553-562 M. Märss,, A. Annuk, A. Allik and J. Uiga
AC-link based new microgrid system for research of local power flow management
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AC-link based new microgrid system for research of local power flow management

M. Märss¹⋅²,*, A. Annuk¹, A. Allik¹ and J. Uiga¹

¹Institute of Technology, Estonian University of Life Sciences, Kreutzwaldi 56, EE51014 Tartu, Estonia 2Tallinn University of Technology, Department of Electrical Engineering, Ehitajate tee 5, EE19086 Tallinn, Estonia; *Correspondence: maido.marss@emu.ee

Abstract:

This paper gives an overview of a distributed energy technology laboratory, where diverse approaches are studied to effectively integrate distributed generation into power systems. The laboratory is equipped with small-scale power generation devices including wind turbine (3.5 kW), PV array (2.5 kW), synthetic energy generator (3.6 kW) and also batteries, ultra capacitor, programmable load (6.2 kW), weather station, power flow and power quality control and monitoring system. The laboratory is used for researching and applying energy-management technics to control energy storage and increasing power reliability and power quality in small-scale generation units. On-site measured data of power consumption and production can be linked to the laboratory and simulated online with synthetic energy generator and programmable load. It is also possible to scale the measured data and model systems with variable sizes. As a result the stability of variable systems can be tested with different storage capacities and load management techniques.

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