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Offshore wind power technology has matured significantly and now directly competes with conventional and onshore wind power generation. Thanks to continuous technological developments and significant cost reduction, offshore wind power is closing the gap with the onshore wind power about the levelized cost of electricity; however the technology challenges in the offshore environment still poses threats...
The increased presence of photovoltaic (PV) systems inevitably affects the power quality in the grid. This new reality demands grid power quality studies involving PV inverters. This paper proposes several frequency response models in the form of equivalent circuits. Models are based on laboratory measurements performed on five different commercially available PV inverters, and fitted to obtain circuit...
In modern buildings virtually all electric loads are non-linear. Neither the applicable standards for supply of electrical energy nor those for consumption of electrical energy take into account the replacement of linear loads by non-linear loads. Low power equipment is exempted in standards assuming that all other (linear) loads dominate the power quality. In modern buildings there is a huge number...
This paper presents harmonic distortion measurements in several countries taken during live televised matches of the 2010 Soccer World Cup held in South Africa. The paper provides an analysis of the components involved in the increase of total harmonic distortion of current and voltage. The work also compares the latest measurements with previous events and makes some considerations regarding future...
An analysis of current transients caused by voltage notches in an industrial plant is presented in the paper. The source of current transients in the factory lighting was traced to the operation of the nearby six-pulse AC/DC converter. Because of the short duration of the phenomenon, it was not possible to determine if there is a parallel resonance using a standard power quality analyzer. To determine...
Residual current devices (RCDs) are most commonly used as a part of the protection system in low voltage installations. RCDs are supposed to disconnect the supply whenever the imbalance current between the live conductor(s) and the neutral conductor, i.e. residual current, exceeds the predetermined value. Such an imbalance is sometimes caused by current leakage through the body of a person who is...
An experimental investigation of diversity factors for CFLs (compact fluorescent lamps) in combination with LED (light emitting diode) lamps is presented in this paper. Diversity factors were calculated for different configurations of lamps connected to the same feeder in one phase. It was found that the presence of LED lamps with a high apparent power input can lead to considerable damping of harmonics...
Power quality (PQ) standards are needed to achieve coordination between the characteristics of the quality of a network's power supply and the requirements of the end use equipments. The European standard EN50160 is a reference for the voltage supplied in medium and low voltage European grids. In the recent years, many discussions are done among regulators, network operators and industrial partners...
Modern household customers use many power electronic based devices for their daily usage. Those devices emit harmonic current pollutions and eventually increase harmonic voltage distortion level in the network. In the future network, the background harmonic pollution in the MV and upstream networks could increase with the integration of more distributed generations. Thus, the harmonic related problem...
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