J. Prousalidis - Academia.edu (original) (raw)

Papers by J. Prousalidis

Journal of Marine Engineering & Technology, 2015

Power supply quality (PSQ) problems in ship electrical systems are a major concern nowadays due t... more Power supply quality (PSQ) problems in ship electrical systems are a major concern nowadays due to the electrification of most equipment on board. Among PSQ problems, voltage transients and spikes are probably the most important as they can cause a range of malfunctions and even damage. The most efficient method of protection against spikes and transients is the installation of surge protection devices (SPDs). This paper presents a holistic methodology of selecting the most appropriate installation points in the ship's electricity grid on the one hand while not resulting in new problems on the other.

Journal of Marine Engineering & Technology, 2014

ABSTRACT Passenger ships have very high requirement for on-board reliability and constant power a... more ABSTRACT Passenger ships have very high requirement for on-board reliability and constant power availability which is very critical for the safety of the passengers and the vessel. Thus, the adaptation of an IPS was early evaluated to be very beneficial. As technology advances, the need for a simulation of the all-electric ship becomes evident, in order to investigate the effect of integrating the appealing DC into the power distribution subsystem of a ship grid, on the overall performance of the vessel. In this paper, a MVDC all-electric ship IPS is modeled from the power generation module to the several distribution loads. In the second part of this work, the effect of a potential fault at the DC subsystem is investigated, in order to fully understand the fault characteristics and impacts. Finally, the necessity of DC grid protection is discussed and some of the dominant fault-interrupting techniques are presented.

2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2018

The 44 km long underground and 132 km long submarine cables constitute the 150 kV AC interconnect... more The 44 km long underground and 132 km long submarine cables constitute the 150 kV AC interconnection between Peloponnese and Crete one of the most technically challenging worldwide. In this paper, the occurrence of the zero-missing phenomenon is examined This phenomenon is attributed to the large percentage of reactive power compensation through shunt reactors needed in long HVAC cables and is represented by a current not crossing zero for several cycles after the cable energization. It poses a significant risk to the power system, since in the case of a faulted cable during energization it may become impossible to open the healthy-phase poles of a circuit breaker without damaging the breaker. The basic circuit of the interconnection is modelled in the EMTP-RV software and the conditions causing the zero-missing phenomenon are simulated. The results reveal the observance of the zero-missing phenomenon under various possible energization schemes, both for faulted and healthy cables. Moreover, the conducted sensitivity analysis indicates the effect of various parameters, including the switching angle of the circuit breaker and the degree of reactive compensation of the cable, on the duration of the zero-missing phenomenon. Finally, various preventive or mitigation countermeasures of the zero-missing phenomenon are proposed.

Abstract: Power Supply Quality (PSQ) has become an important concern for ship electric systems. T... more Abstract: Power Supply Quality (PSQ) has become an important concern for ship electric systems. Thus, deviations of voltage from nominal values and wave-shapes could cause several problems onboard. Considering that ship system electrification eventually dominates according to the All Electric Ship concept, PSQ will be a key-factor of the normal operation, survivability and safety aboard. The paper provides a coherent description and categorisation of the PSQ phenomena (causes, consequences, characteristic parameters etc.) highlighting similarities and differences between terrestrial systems and ship systems in terms of these phenomena. This overview is enriched by

The modern ship constitutes a complex power-train comprising different types of equipment, main a... more The modern ship constitutes a complex power-train comprising different types of equipment, main and auxiliary. Recently, the extensively electrified ship, with most of the systems onboard (including propulsion) being electrically connected according to the concept of All Electric Ship (AES), has been appreciated as the most interesting “green” solution. In this environmentally friendly design concept, the thermal engines are coupled to electric generators, and used only for the production of electric energy. To this end, this paper focuses on a brief but succinct overview of the results of research projects regarding several AES innovations, in which the authors have been cooperating.

2021 IEEE Electric Ship Technologies Symposium (ESTS), 2021

This paper presents an analysis on how ports can estimate the electric power and energy demands d... more This paper presents an analysis on how ports can estimate the electric power and energy demands due to the implementation of cold ironing, as a solution to minimise the atmospheric pollution provoked by ships at berth. Alternative methods are analysed and discussed. The first one is based on approximate formulae to calculate the power demand as a fraction of the ship installed power. The second one utilizes the monitoring database of ship emissions. A parameters estimation is then realised to show how the approximate method can be tuned to obtain results comparable with those obtained with the emissions analysis.

International Journal of Ocean Systems Management, 2008

Power Supply Quality (PSQ) has become an important concern for ship electric systems. Thus, devia... more Power Supply Quality (PSQ) has become an important concern for ship electric systems. Thus, deviations of voltage from nominal values and wave-shapes could cause several problems onboard. Considering that ship system electrification eventually dominates according to the All Electric Ship concept, PSQ will be a key-factor of the normal operation, survivability and safety aboard. The paper provides a coherent description and categorisation of the PSQ phenomena (causes, consequences, characteristic parameters etc.) highlighting similarities and differences between terrestrial systems and ship systems in terms of these phenomena. This overview is enriched by cross-references to relevant standards applied in shipboard applications.

2009 IEEE Electric Ship Technologies Symposium, 2009

The target of this paper is twofold: primarily to highlight the significant effect of certain pow... more The target of this paper is twofold: primarily to highlight the significant effect of certain power supply quality problems on the normal operation of the entire ship grid, namely inrush currents and voltage dips due to manoeuvring thruster motor starting-ups. At a second stage, the paper aims at recommending some amelioration of standardization status. Hence, the authors suggest the exploitation of existing experience on pulsed load standardizing, taking into account the resemblance between the systems. The study is enriched by actual case studies and simulations in PSCAD computer program. .

Journal of Marine Engineering & Technology, 2015

This paper provides the main concept of reactive power compensation onboard ship electrical energ... more This paper provides the main concept of reactive power compensation onboard ship electrical energy systems mainly as a retrofitting means towards assisting the generator plant and improving the ship efficiency in terms of fuel consumption and emissions. The alternative means are presented and discussed via the support of actual case studies.

Natural gas has been widely recognized as the most promising fuel alternative to oil combining bo... more Natural gas has been widely recognized as the most promising fuel alternative to oil combining both high efficiency and environmental friendliness. To this end, significant investments have been concentrated on ships transporting large quantities of Liquefied Natural Gas, also known as LNG carriers (LNGC). Even more recently, a portion of the LNGC fleet is candidate for conversion or has already been converted to Floating Storage and Regasification Units (FSRU) to service emerging markets. Insular territories are part of those markets, requiring energy production with reduced emissions, especially those not interconnected with the mainland power grid. A rather established concept for such instances is the integration of an FSRU feeding natural gas to the power plant, thus forming a so called “gas-to-power system”. An even more innovative approach is presented in the current study, proposing the conversion of an LNGC to a floating power plant, combing storage, regasification and powe...

Abstract A new transformer model, namedgeometrical', is developed, based on the circuit anal... more Abstract A new transformer model, namedgeometrical', is developed, based on the circuit analysis of its magnetic core. The method is general and can be used for any type of multiphase multiwinding transformer. The model simulates the transformer as a set of ...

2017 IEEE Electric Ship Technologies Symposium (ESTS)

Conference Proceedings of ICMET Oman

The paper deals with the new development perspectives of modern smart ports in an attempt to offe... more The paper deals with the new development perspectives of modern smart ports in an attempt to offer premium services to ships, passengers, commercial business, the environment even the society fully exploiting the smart grid concept. Besides highlighting the courses of actions towards such reformation, it is discussed that of major importance is the proper design of a centralized energy management system providing supervisory monitoring and control of all energy transactions among providers and consumers as well as their optimized co-operation.

Journal of Marine Engineering & Technology

Journal of Marine Engineering & Technology, 2015

Power supply quality (PSQ) problems in ship electrical systems are a major concern nowadays due t... more Power supply quality (PSQ) problems in ship electrical systems are a major concern nowadays due to the electrification of most equipment on board. Among PSQ problems, voltage transients and spikes are probably the most important as they can cause a range of malfunctions and even damage. The most efficient method of protection against spikes and transients is the installation of surge protection devices (SPDs). This paper presents a holistic methodology of selecting the most appropriate installation points in the ship's electricity grid on the one hand while not resulting in new problems on the other.

Journal of Marine Engineering & Technology, 2014

ABSTRACT Passenger ships have very high requirement for on-board reliability and constant power a... more ABSTRACT Passenger ships have very high requirement for on-board reliability and constant power availability which is very critical for the safety of the passengers and the vessel. Thus, the adaptation of an IPS was early evaluated to be very beneficial. As technology advances, the need for a simulation of the all-electric ship becomes evident, in order to investigate the effect of integrating the appealing DC into the power distribution subsystem of a ship grid, on the overall performance of the vessel. In this paper, a MVDC all-electric ship IPS is modeled from the power generation module to the several distribution loads. In the second part of this work, the effect of a potential fault at the DC subsystem is investigated, in order to fully understand the fault characteristics and impacts. Finally, the necessity of DC grid protection is discussed and some of the dominant fault-interrupting techniques are presented.

2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2018

The 44 km long underground and 132 km long submarine cables constitute the 150 kV AC interconnect... more The 44 km long underground and 132 km long submarine cables constitute the 150 kV AC interconnection between Peloponnese and Crete one of the most technically challenging worldwide. In this paper, the occurrence of the zero-missing phenomenon is examined This phenomenon is attributed to the large percentage of reactive power compensation through shunt reactors needed in long HVAC cables and is represented by a current not crossing zero for several cycles after the cable energization. It poses a significant risk to the power system, since in the case of a faulted cable during energization it may become impossible to open the healthy-phase poles of a circuit breaker without damaging the breaker. The basic circuit of the interconnection is modelled in the EMTP-RV software and the conditions causing the zero-missing phenomenon are simulated. The results reveal the observance of the zero-missing phenomenon under various possible energization schemes, both for faulted and healthy cables. Moreover, the conducted sensitivity analysis indicates the effect of various parameters, including the switching angle of the circuit breaker and the degree of reactive compensation of the cable, on the duration of the zero-missing phenomenon. Finally, various preventive or mitigation countermeasures of the zero-missing phenomenon are proposed.

Abstract: Power Supply Quality (PSQ) has become an important concern for ship electric systems. T... more Abstract: Power Supply Quality (PSQ) has become an important concern for ship electric systems. Thus, deviations of voltage from nominal values and wave-shapes could cause several problems onboard. Considering that ship system electrification eventually dominates according to the All Electric Ship concept, PSQ will be a key-factor of the normal operation, survivability and safety aboard. The paper provides a coherent description and categorisation of the PSQ phenomena (causes, consequences, characteristic parameters etc.) highlighting similarities and differences between terrestrial systems and ship systems in terms of these phenomena. This overview is enriched by

The modern ship constitutes a complex power-train comprising different types of equipment, main a... more The modern ship constitutes a complex power-train comprising different types of equipment, main and auxiliary. Recently, the extensively electrified ship, with most of the systems onboard (including propulsion) being electrically connected according to the concept of All Electric Ship (AES), has been appreciated as the most interesting “green” solution. In this environmentally friendly design concept, the thermal engines are coupled to electric generators, and used only for the production of electric energy. To this end, this paper focuses on a brief but succinct overview of the results of research projects regarding several AES innovations, in which the authors have been cooperating.

2021 IEEE Electric Ship Technologies Symposium (ESTS), 2021

This paper presents an analysis on how ports can estimate the electric power and energy demands d... more This paper presents an analysis on how ports can estimate the electric power and energy demands due to the implementation of cold ironing, as a solution to minimise the atmospheric pollution provoked by ships at berth. Alternative methods are analysed and discussed. The first one is based on approximate formulae to calculate the power demand as a fraction of the ship installed power. The second one utilizes the monitoring database of ship emissions. A parameters estimation is then realised to show how the approximate method can be tuned to obtain results comparable with those obtained with the emissions analysis.

International Journal of Ocean Systems Management, 2008

Power Supply Quality (PSQ) has become an important concern for ship electric systems. Thus, devia... more Power Supply Quality (PSQ) has become an important concern for ship electric systems. Thus, deviations of voltage from nominal values and wave-shapes could cause several problems onboard. Considering that ship system electrification eventually dominates according to the All Electric Ship concept, PSQ will be a key-factor of the normal operation, survivability and safety aboard. The paper provides a coherent description and categorisation of the PSQ phenomena (causes, consequences, characteristic parameters etc.) highlighting similarities and differences between terrestrial systems and ship systems in terms of these phenomena. This overview is enriched by cross-references to relevant standards applied in shipboard applications.

2009 IEEE Electric Ship Technologies Symposium, 2009

The target of this paper is twofold: primarily to highlight the significant effect of certain pow... more The target of this paper is twofold: primarily to highlight the significant effect of certain power supply quality problems on the normal operation of the entire ship grid, namely inrush currents and voltage dips due to manoeuvring thruster motor starting-ups. At a second stage, the paper aims at recommending some amelioration of standardization status. Hence, the authors suggest the exploitation of existing experience on pulsed load standardizing, taking into account the resemblance between the systems. The study is enriched by actual case studies and simulations in PSCAD computer program. .

Journal of Marine Engineering & Technology, 2015

This paper provides the main concept of reactive power compensation onboard ship electrical energ... more This paper provides the main concept of reactive power compensation onboard ship electrical energy systems mainly as a retrofitting means towards assisting the generator plant and improving the ship efficiency in terms of fuel consumption and emissions. The alternative means are presented and discussed via the support of actual case studies.

Natural gas has been widely recognized as the most promising fuel alternative to oil combining bo... more Natural gas has been widely recognized as the most promising fuel alternative to oil combining both high efficiency and environmental friendliness. To this end, significant investments have been concentrated on ships transporting large quantities of Liquefied Natural Gas, also known as LNG carriers (LNGC). Even more recently, a portion of the LNGC fleet is candidate for conversion or has already been converted to Floating Storage and Regasification Units (FSRU) to service emerging markets. Insular territories are part of those markets, requiring energy production with reduced emissions, especially those not interconnected with the mainland power grid. A rather established concept for such instances is the integration of an FSRU feeding natural gas to the power plant, thus forming a so called “gas-to-power system”. An even more innovative approach is presented in the current study, proposing the conversion of an LNGC to a floating power plant, combing storage, regasification and powe...

Abstract A new transformer model, namedgeometrical', is developed, based on the circuit anal... more Abstract A new transformer model, namedgeometrical', is developed, based on the circuit analysis of its magnetic core. The method is general and can be used for any type of multiphase multiwinding transformer. The model simulates the transformer as a set of ...

2017 IEEE Electric Ship Technologies Symposium (ESTS)

Conference Proceedings of ICMET Oman

The paper deals with the new development perspectives of modern smart ports in an attempt to offe... more The paper deals with the new development perspectives of modern smart ports in an attempt to offer premium services to ships, passengers, commercial business, the environment even the society fully exploiting the smart grid concept. Besides highlighting the courses of actions towards such reformation, it is discussed that of major importance is the proper design of a centralized energy management system providing supervisory monitoring and control of all energy transactions among providers and consumers as well as their optimized co-operation.

Journal of Marine Engineering & Technology