Author
Ioulia T. Papaioannou
Bio: Ioulia T. Papaioannou is an academic researcher from Aristotle University of Thessaloniki. The author has contributed to research in topics: Photovoltaic system & Grid-connected photovoltaic power system. The author has an hindex of 9, co-authored 15 publications receiving 471 citations.
Papers
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TL;DR: In this article, the application of battery-based storage systems for household demand smoothening in electricity-distribution grids was analyzed in case studies of Denmark, Portugal, Greece, France and Italy.
96 citations
TL;DR: In this paper, the authors investigate the impact of the penetration of photovoltaic (PV) units in the low-voltage (LV) network and investigate the acceptable penetration level of PV systems in several scenarios, depending on the topology of the LV network, the number, size, and locations of loads and PV units.
Abstract: The operation of photovoltaic (PV) units connected to the grid is characterized by several uncertainties due to the number of currently operating units, the points where these units are sited, the exported power, and the injection of harmonic currents. The objective of this paper is to investigate the impact of the penetration of PV units in the low-voltage (LV) network. Thus, a model has been developed for the computation of load flows, harmonics, and voltages in the feeders. A PV panel is modeled as an irradiance-driven current generator, with an embodied maximum power point (MPP) tracking algorithm; it is connected to the network via electronic switches that represent the PV inverter. Simulations are performed with PSIM and Harmoniques simulator packages. Results from the simulated model are validated with data acquired from field measurements and bibliography. Finally, the acceptable penetration level of PV systems is investigated for several scenarios, depending on the topology of the LV network, the number, size, and locations of loads and PV units.
66 citations
DOI•
01 Jan 2012
TL;DR: The purpose of this report is to provide background information on potentials, barriers, best practices, state of the art and measures of promotion of District Heating and Cooling to aid policy mak decisions.
Abstract: The purpose of this report is to provide background information on potentials, barriers, best practices, state of the art and measures of promotion of District Heating and Cooling to aid policy mak ...
65 citations
28 May 2008
TL;DR: In this paper, the harmonic impact of a 20 kWp photovoltaic (PV) system connected to the low voltage (LV) distribution network in Greece is investigated. But the analysis is limited to the case of a single PV plant, and the level of penetration of PV systems in the LV distribution network has not been investigated.
Abstract: Since the penetration of photovoltaic (PV) systems in the low voltage (LV) distribution network is increasing, the need to register and model the contribution of these systems to the harmonic distortion of current and voltage waveforms is becoming an up-to-date issue. As PV systems incorporate power conditioning units, which are harmonic generating devices, they will have an influence on quality of supply, reliable operation of system equipment as well as component life expectancy. This paper investigates the harmonic impact of a 20 kWp PV system connected to the LV distribution network in Greece. The harmonic behavior of the PV plant as a function of the solar radiation under several weather conditions is analyzed. Measurements results are compared to those obtained from the power simulator package PSIMcopy. The level of penetration of PV systems in the LV distribution network without harmonic limits been exceeded is investigated.
65 citations
TL;DR: In this article, the authors examined the penetration of distributed generation from a technical point of view and explored the possible barriers that may arise under high penetration conditions, and suggested that, in critical cases, customers at the end of the LV feeder would be the main contributors to ensuring the uninterrupted operation of distributed generators within power quality standards.
46 citations
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TL;DR: In this article, the authors summarized existing research on PV self-consumption and options to improve it, namely energy storage and load management, also called demand side management (DSM), and showed that it is possible to increase the relative selfconsumption with a battery storage capacity of 0.5-1. kW.
701 citations
TL;DR: In this article, the authors proposed a maximum power point tracking (MPPT) method using Cuckoo Search (CS) method for large and medium-sized PV systems. And the results show that CS is capable of tracking MPP within 100-250 ms under various types of environmental change.
476 citations
TL;DR: In this article, an overview of the different types of batteries used for large-scale electricity storage is carried out, in particular, the current operational large scale battery energy storage systems around the world with their applications are identified and a comparison between the different kinds of batteries, as well as with other types of large scale energy storage system systems, is presented.
Abstract: In this work, an overview of the different types of batteries used for large-scale electricity storage is carried out. In particular, the current operational large-scale battery energy storage systems around the world with their applications are identified and a comparison between the different types of batteries, as well as with other types of large-scale energy storage systems, is presented. The analysis has shown that the largest battery energy storage systems use sodium–sulfur batteries, whereas the flow batteries and especially the vanadium redox flow batteries are used for smaller battery energy storage systems. The battery electricity storage systems are mainly used as ancillary services or for supporting the large scale solar and wind integration in the existing power system, by providing grid stabilization, frequency regulation and wind and solar energy smoothing.
406 citations
TL;DR: In this article, a comprehensive overview on important issues affecting the distribution system as a result of PV penetration is presented, including voltage fluctuation, voltage rise, voltage balance, and harmonics and their effect on the system.
Abstract: The solar energy generation has grown significantly in the past years. The importance of PV penetration in power system as a major element of renewable energy source has seen it being widely used on a global scale. Despite its promising success, PV penetration presents various issues and its impact on the distribution system has to address for seamless integration in the power system. In this paper, a comprehensive overview on important issues affecting the distribution system as a result of PV penetration is presented. Pertinent issues such as voltage fluctuation, voltage rise, voltage balance, and harmonics and their effect on the system are discussed in details. The islanding issues, which are of critical importance to the stability and integrity of the system, are also thoroughly reviewed. Details on different islanding techniques – remote and local techniques and their advantage and disadvantages are shown. Therefore, this paper can provide useful information and serve as a reference for researchers and utility engineers on issues to be considered with regards to PV penetration.
403 citations
TL;DR: In this article, the authors extensively review the technical challenges associated with the integration of large-scale PV into the power system and discuss the technical solutions to overcome these challenges, and summarize the research findings about the technical solution to overcome power system stability challenges regarding the large scale PV integration into the transmission and subtransmission or medium voltage distribution system.
Abstract: Global warming is the main driving force behind worldwide interest for the generation of bulk electrical energy from renewable sources. As a consequence of advancements in solar cell fabrication and converter technology, solar PV has emerged as one of the most promising renewable sources for bulk power generation. If the current commissioning rate continues, PV power would lead to the modification of several aspects of power system and could influence the stability of the system. This paper extensively reviews the technical challenges, on particular, the stability issues associated with the integration of large-scale PV into the power system. In addition, the paper also reviews the dynamic model of large-scale PV for stability studies as well as the grid codes for large-scale PV integration into the system. Finally, this paper summarizes the research findings about the technical solutions to overcome the power system stability challenges regarding the large-scale PV integration into the transmission and sub-transmission or medium voltage distribution system.
362 citations