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Lenos Hadjidemetriou
University of Cyprus
50Publications
10H-index
398Citations
Publications 55
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Last.Elias KyriakidesH-Index: 26
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1 CitationsSource
#1Andreas Kotsonias (UCY: University of Cyprus)
#2Lenos Hadjidemetriou (UCY: University of Cyprus)H-Index: 10
Last.Elias Kyriakides (UCY: University of Cyprus)H-Index: 26
view all 3 authors...
The forward/backward sweep is the most commonly used power flow method in radial Low Voltage Distribution Grids (LVDGs). In most cases, Kron's reduction is used to merge the neutral conductor with the phase conductors. However, important information can be lost by ignoring the effect of the neutral conductor through the Kron's reduction method, since in LVDGs the majority of loads are single-phase connected and are supplied through a phase conductor and the neutral. In this paper, a modification...
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#1Lenos Hadjidemetriou (UCY: University of Cyprus)H-Index: 10
#2Anastasis Charalambous (UCY: University of Cyprus)H-Index: 1
Last.Elias Kyriakides (UCY: University of Cyprus)H-Index: 26
view all 3 authors...
Low-voltage distribution grids face several challenges due to the high penetration of renewable energy sources, the increasing demand (electrification of thermal and transportation sector), and the limited observability (absence of smart metering infrastructure). These challenges impose problems regarding the integrity, stability, power quality and efficiency of distribution grids. Therefore, intelligent solutions are required in order to overcome these problems. This paper proposes a centralize...
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#1Lysandros Tziovani (UCY: University of Cyprus)H-Index: 1
#2Panayiotis Kolios (UCY: University of Cyprus)H-Index: 10
Last.Elias Kyriakides (UCY: University of Cyprus)H-Index: 26
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The intermittent character of renewable energy sources (RES) creates market potentials for the emerging energy storage technologies. Energy storage systems can be utilized to support the grid, compensate the intense variation of RES production, and create opportunities for prosumers to maximize their profit under a variable electricity pricing scheme. In this paper, an optimal scheduling method is designed for a hybrid photovoltaic-storage system in a non-residential building. The scheduling sch...
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#1Andrews Kotsonias (UCY: University of Cyprus)
#2Lenos Hadjidemetriou (UCY: University of Cyprus)H-Index: 10
Last.Yiannakis Ioannou (Electricity Authority of Cyprus)
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The operation of a typical 4-wire, radial, Low Voltage Distribution Grid (LVDG) in the Cyprus power system, where the neutral conductor is grounded only at the MV/LV transformer, is investigated under different scenarios. These include seasonal loading profiles and different penetration levels of photovoltaics (PVs) and electric vehicles (EVs). The analysis is focused on the impact of PVs and EVs on the voltage profile of the LVDG, the loading conditions of the distribution lines/cables and on t...
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#1Lazaros Zacharia (UCY: University of Cyprus)H-Index: 2
#2Lysandros Tziovani (UCY: University of Cyprus)H-Index: 1
Last.Salem Al-Agtash (German-Jordanian University)H-Index: 9
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Microgrids are becoming one of the main components of future smart grids. Ensuring their optimal and stable operation is of crucial importance and can be a challenging task. In this paper, two optimization algorithms are implemented for scheduling the microgrid operation in grid-connected and islanded modes, according to the priorities and objectives in each mode. For achieving an optimal operation at each mode, the proposed scheme is able to shed loads, define the generation level of the photov...
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#1Anastasis Charalambous (UCY: University of Cyprus)H-Index: 1
#2Lenos Hadjidemetriou (UCY: University of Cyprus)H-Index: 10
Last.Elias Kyriakides (UCY: University of Cyprus)H-Index: 26
view all 3 authors...
Power electronics converters can enable grid support functionalities under abnormal grid conditions. In this paper, a voltage-frequency support strategy based on the reactance to resistance (X/R) ratio of the grid impedance is proposed for a flywheel energy storage system. Unlike conventional support schemes where voltage and frequency support is decoupled, the proposed strategy considers the coupling between voltage and frequency due to the resistive characteristics of the grid impedance in low...
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#1Lenos Hadjidemetriou (UCY: University of Cyprus)H-Index: 10
#2Anastasis Charalambous (UCY: University of Cyprus)H-Index: 1
Last.Elias Kyriakides (UCY: University of Cyprus)H-Index: 26
view all 4 authors...
This work proposes a sensor-less controller for grid tied photovoltaic (PV) inverters to enable phase balancing functionalities for compensating asymmetric loading conditions imposed by building loads in low voltage distribution grids. For enabling such an advanced functional operation by PV inverter, the first step is to enable the inverter to estimate the equivalent grid impedance. Then, the grid impedance is utilized to approximate the nearby load asymmetries without using any additional curr...
Source
#1Andreas Kotsonias (UCY: University of Cyprus)
#2Lenos Hadjidemetriou (UCY: University of Cyprus)H-Index: 10
Last.Elias Kyriakides (UCY: University of Cyprus)H-Index: 26
view all 4 authors...
Low voltage distribution grids (LVDGs) are evolving from their traditional passive behavior into highly active systems. Their secure and reliable operation will require effective control schemes which in return require reliable and accurate monitoring systems. Most of the related existing works rely on the three-phase Weighted Least Squares (WLS) state estimation method which is used mainly on Medium Voltage Distribution Grids (MVDGs). However due to different characteristics between MVDGs and L...
2 CitationsSource
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