Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867077
K. Brown, A. Mcclaine, D. Bowen
A new paradigm is needed for electricity storage in the renewables energy market. Today, what passes for “grid storage” are technologies that provide, at most, eight to 12 hours of discharge. If we are to successfully go to 100% renewables and to wean electricity generation from fossil fuels, we need storage to have up to 592 hours (88,800MWh/150MW from Tables 2 and 3 column 3) of discharge time to back up the modeled wind farm that is intermittent. Sometimes the wind does not blow and the sun does not shine for long periods of time. Long discharge time gives us reliability.
{"title":"Hydrogen and a New Paradigm for Electricity Storage","authors":"K. Brown, A. Mcclaine, D. Bowen","doi":"10.1109/OSES.2019.8867077","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867077","url":null,"abstract":"A new paradigm is needed for electricity storage in the renewables energy market. Today, what passes for “grid storage” are technologies that provide, at most, eight to 12 hours of discharge. If we are to successfully go to 100% renewables and to wean electricity generation from fossil fuels, we need storage to have up to 592 hours (88,800MWh/150MW from Tables 2 and 3 column 3) of discharge time to back up the modeled wind farm that is intermittent. Sometimes the wind does not blow and the sun does not shine for long periods of time. Long discharge time gives us reliability.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121909793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867047
Yi-chung Chen, J. Radcliffe, Yulong Ding
Decarbonising heating sector is one of the key challenges in reducing carbon emissions. In the UK, the offshore wind energy potential is more than the energy consumption, however, energy storage is needed due to the intermittency of wind energy. A conceptual system is proposed that directly converts wind to heat at the offshore wind farm, stores heat in thermochemical storage, transported to heat users, and discharging upon demand. The LCOE of this system is compared with a reference system and the result shows that the new system has the potential to reduce the cost of transfer energy from the offshore wind farm to the coast. Loading and storing containers at the offshore wind farm need further investigation by marine engineering expertise. Developing a suitable TES system that can be operating under the offshore environment, easy to store and transport, and have low energy loss are the key criteria of this offshore wind system.
{"title":"Concept of offshore direct wind-to-heat system integrated with thermal energy storage for decarbonising heating","authors":"Yi-chung Chen, J. Radcliffe, Yulong Ding","doi":"10.1109/OSES.2019.8867047","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867047","url":null,"abstract":"Decarbonising heating sector is one of the key challenges in reducing carbon emissions. In the UK, the offshore wind energy potential is more than the energy consumption, however, energy storage is needed due to the intermittency of wind energy. A conceptual system is proposed that directly converts wind to heat at the offshore wind farm, stores heat in thermochemical storage, transported to heat users, and discharging upon demand. The LCOE of this system is compared with a reference system and the result shows that the new system has the potential to reduce the cost of transfer energy from the offshore wind farm to the coast. Loading and storing containers at the offshore wind farm need further investigation by marine engineering expertise. Developing a suitable TES system that can be operating under the offshore environment, easy to store and transport, and have low energy loss are the key criteria of this offshore wind system.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127930741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867342
A. Hoskin, S. Garvey, J. Rouse, B. Cárdenas
Inertia plays an important role in the function of electrical grid stability. When there is a difference between supply and demand grid frequency will change. Inertia resists this change and limits the rate of change of frequency (RoCoF) giving time for power stations to change their supply to match demand. Traditional thermal power stations have significant amounts of inertia in their generators and steam turbines. Renewable energy sources such as wind and solar tend to have little or no inertia and as a result grid inertia has reduced and will continue to do so in the future, causing issues of grid stability. There are various ways to address this problem including: replacing grid inertia, increasing the maximum level of RoCoF allowed, or minimising the largest generator or load on the grid. Inertia hasn't traditionally been a traded commodity as it has been a by-product of large thermal power generation. This is likely to change in the future with the increase in non-synchronous generation. The costs and methods of creating grid inertia are somewhat novel fields. This paper surveys some of the options of creating grid inertia. It also presents SHyKESS which is a flywheel based method of creating grid inertia and primary frequency control.
{"title":"On the Costs of Grid Inertia","authors":"A. Hoskin, S. Garvey, J. Rouse, B. Cárdenas","doi":"10.1109/OSES.2019.8867342","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867342","url":null,"abstract":"Inertia plays an important role in the function of electrical grid stability. When there is a difference between supply and demand grid frequency will change. Inertia resists this change and limits the rate of change of frequency (RoCoF) giving time for power stations to change their supply to match demand. Traditional thermal power stations have significant amounts of inertia in their generators and steam turbines. Renewable energy sources such as wind and solar tend to have little or no inertia and as a result grid inertia has reduced and will continue to do so in the future, causing issues of grid stability. There are various ways to address this problem including: replacing grid inertia, increasing the maximum level of RoCoF allowed, or minimising the largest generator or load on the grid. Inertia hasn't traditionally been a traded commodity as it has been a by-product of large thermal power generation. This is likely to change in the future with the increase in non-synchronous generation. The costs and methods of creating grid inertia are somewhat novel fields. This paper surveys some of the options of creating grid inertia. It also presents SHyKESS which is a flywheel based method of creating grid inertia and primary frequency control.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131142512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867170
C. Cutajar, T. Sant, D. Buhagiar, R. Farrugia
With a continuously growing demand for fresh water, water resources are increasingly being stressed with currently over two thirds of the global population living in water-stressed and water-scarce countries. One way to address this is to augment the supply of potable water through desalination. However, several challenges arise pertaining to the development of desalination plants, including the substantial amounts of land resources and energy required. In fact, powering such plants using renewable energy sources, such as the wind, is being considered as a leading alternative. A novel system is being proposed comprising of an offshore wind-powered reverse osmosis desalination unit. A hydropneumatic energy storage system is also integrated within the system to smoothen out the pressure fluctuations and mitigate the supply-demand mismatch while providing a stabilising upthrust to the floating structure.
{"title":"Modelling of a Hybrid Floating Wind, Energy Storage and Desalination Unit","authors":"C. Cutajar, T. Sant, D. Buhagiar, R. Farrugia","doi":"10.1109/OSES.2019.8867170","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867170","url":null,"abstract":"With a continuously growing demand for fresh water, water resources are increasingly being stressed with currently over two thirds of the global population living in water-stressed and water-scarce countries. One way to address this is to augment the supply of potable water through desalination. However, several challenges arise pertaining to the development of desalination plants, including the substantial amounts of land resources and energy required. In fact, powering such plants using renewable energy sources, such as the wind, is being considered as a leading alternative. A novel system is being proposed comprising of an offshore wind-powered reverse osmosis desalination unit. A hydropneumatic energy storage system is also integrated within the system to smoothen out the pressure fluctuations and mitigate the supply-demand mismatch while providing a stabilising upthrust to the floating structure.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131299163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867334
Antoine Debille, Corentin Simon, R. Loisel, David Guyomarc'h, Thibault Neu, L. Lemiale
This study investigates the system benefits of the integration of an underwater CAES storage technology to support variable renewables integration. The case study is the French island of Guadeloupe, where power specificities are the high share of fossil fuels, i.e. diesel and coal, and the significant seasonal variability of the load. An optimization model is built to test energy scenarios targeting 100% renewables on the island such as to minimize the waste of energy, i.e. the power curtailed, subject to hourly supply-demand balance. The underwater Isothermal-CAES storage system under consideration seems suitable for coupling with large-scale fluctuating energy renewable power plants and to attain carbon emission targets, due to higher efficiency rate (70%) than conventional CAES, and to free of natural gas requirements. The model shows that using I-CAES storage allows the system to avoid curtailment of fluctuating renewables, and that fast adjustment speeds and the resilience to frequent start-ups and shut-downs effects are the suitable features for attaining political energy targets of the island in 2030.
{"title":"Underwater CAES assessment: economic and engineering references for energy mix sizing in islands grids","authors":"Antoine Debille, Corentin Simon, R. Loisel, David Guyomarc'h, Thibault Neu, L. Lemiale","doi":"10.1109/OSES.2019.8867334","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867334","url":null,"abstract":"This study investigates the system benefits of the integration of an underwater CAES storage technology to support variable renewables integration. The case study is the French island of Guadeloupe, where power specificities are the high share of fossil fuels, i.e. diesel and coal, and the significant seasonal variability of the load. An optimization model is built to test energy scenarios targeting 100% renewables on the island such as to minimize the waste of energy, i.e. the power curtailed, subject to hourly supply-demand balance. The underwater Isothermal-CAES storage system under consideration seems suitable for coupling with large-scale fluctuating energy renewable power plants and to attain carbon emission targets, due to higher efficiency rate (70%) than conventional CAES, and to free of natural gas requirements. The model shows that using I-CAES storage allows the system to avoid curtailment of fluctuating renewables, and that fast adjustment speeds and the resilience to frequent start-ups and shut-downs effects are the suitable features for attaining political energy targets of the island in 2030.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121790543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867323
M. Ebrahimi, R. Carriveau, D. Ting, A. McGillis, Davin Young
Experience with Toronto's Underwater Compressed Air Energy Storage (UWCAES) facility has shown the technology to be more versatile than originally anticipated. Beyond typical steady-state operations, potentially valuable ancillary grid service roles can be assumed in the transient phase of its operation. This study examines the challenge to operate efficiently during UWCAES ramping events. A conventional and advanced exergy analysis is here conducted for the world's first grid connected UWCAES facility located in Toronto, Canada. A conventional exergy analysis showed that under real working conditions, the exergy efficiency of the plant is low during start-up. The exergy destruction rate, under unavoidable conditions, 2 minutes after the start of the transient phase is 42%, and this decreases asymptotically to 25%. An advanced analysis of exergy efficiency through a complete charge/discharge cycle suggested that the first improvement priority be given to the Heat Exchangers group. This should then be followed by the Ancillary, Compressor, Turbine, Motors and Generator and Pipelines groups. In terms of the rate of exergy destruction the analysis indicated that improvement priority for the Compressor group was higher than that for Heat Exchangers followed by Ancillary, Motors and Generator, Turbine and Pipelines groups. The advanced exergy analysis also revealed that 67% of the exergy destruction was endogenous and avoidable, highlighting the significant potential for performance improvement. Moreover, it was shown that with improvement in the system's component efficiencies, the plant exergy efficiency could be exogenously improved. This effect could further reduce the total exergy destruction to 76%, where only 9% is due to component-component interaction.
{"title":"Transient Thermodynamic Assessment of the World's First Grid Connected UWCAES Facility by Exergy Analysis","authors":"M. Ebrahimi, R. Carriveau, D. Ting, A. McGillis, Davin Young","doi":"10.1109/OSES.2019.8867323","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867323","url":null,"abstract":"Experience with Toronto's Underwater Compressed Air Energy Storage (UWCAES) facility has shown the technology to be more versatile than originally anticipated. Beyond typical steady-state operations, potentially valuable ancillary grid service roles can be assumed in the transient phase of its operation. This study examines the challenge to operate efficiently during UWCAES ramping events. A conventional and advanced exergy analysis is here conducted for the world's first grid connected UWCAES facility located in Toronto, Canada. A conventional exergy analysis showed that under real working conditions, the exergy efficiency of the plant is low during start-up. The exergy destruction rate, under unavoidable conditions, 2 minutes after the start of the transient phase is 42%, and this decreases asymptotically to 25%. An advanced analysis of exergy efficiency through a complete charge/discharge cycle suggested that the first improvement priority be given to the Heat Exchangers group. This should then be followed by the Ancillary, Compressor, Turbine, Motors and Generator and Pipelines groups. In terms of the rate of exergy destruction the analysis indicated that improvement priority for the Compressor group was higher than that for Heat Exchangers followed by Ancillary, Motors and Generator, Turbine and Pipelines groups. The advanced exergy analysis also revealed that 67% of the exergy destruction was endogenous and avoidable, highlighting the significant potential for performance improvement. Moreover, it was shown that with improvement in the system's component efficiencies, the plant exergy efficiency could be exogenously improved. This effect could further reduce the total exergy destruction to 76%, where only 9% is due to component-component interaction.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133377324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867314
Sjors de Rooij, A. Laguna
Oscillating-water-column (OWC) devices are a very important type of wave energy converters which have been extensively studied over the years. Although most designs of OWC are based on floating or fixed structures exposed above the surface level, little is known from completely submerged systems which can benefit from reduced environmental loads and a simplified structural design. The submerged type of resonant duct consists of two OWCs separated by a weir and air chamber instead of the commonly used single column. Under conditions close to resonance, water flows from the first column into the second one, resulting in a positive flow through the system from which energy can be extracted by a hydro turbine. While existing work has looked at the study of the behaviour of one OWC, this paper addresses the dynamic interaction between the two water columns including the mass transfer mechanism as well as the associated change of momentum. A numerical time-domain model is used to obtain some initial results on the performance and response of the system for different design parameters. The model is derived from 1D conservation of mass and momentum equations, including hydrodynamic effects, adiabatic air compressibility and turbine induced damping. Preliminary results indicate that the mass transfer has an important effect both on the resonance amplification and on the phase between the motion of the two columns. Simulation results are presented for the system performance over several weir heights and regular wave conditions. Further work will continue in design optimization and experimental validation of the proposed model.
{"title":"Modelling of submerged oscillating water columns with mass transfer for wave energy extraction","authors":"Sjors de Rooij, A. Laguna","doi":"10.1109/OSES.2019.8867314","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867314","url":null,"abstract":"Oscillating-water-column (OWC) devices are a very important type of wave energy converters which have been extensively studied over the years. Although most designs of OWC are based on floating or fixed structures exposed above the surface level, little is known from completely submerged systems which can benefit from reduced environmental loads and a simplified structural design. The submerged type of resonant duct consists of two OWCs separated by a weir and air chamber instead of the commonly used single column. Under conditions close to resonance, water flows from the first column into the second one, resulting in a positive flow through the system from which energy can be extracted by a hydro turbine. While existing work has looked at the study of the behaviour of one OWC, this paper addresses the dynamic interaction between the two water columns including the mass transfer mechanism as well as the associated change of momentum. A numerical time-domain model is used to obtain some initial results on the performance and response of the system for different design parameters. The model is derived from 1D conservation of mass and momentum equations, including hydrodynamic effects, adiabatic air compressibility and turbine induced damping. Preliminary results indicate that the mass transfer has an important effect both on the resonance amplification and on the phase between the motion of the two columns. Simulation results are presented for the system performance over several weir heights and regular wave conditions. Further work will continue in design optimization and experimental validation of the proposed model.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117251931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867350
A. Ioannou, F. Brennan
Non-grid connected (NGC) floating offshore wind (OW) turbines can signify a solution for harvesting wind energy far offshore, addressing some key issues including the deep waters and lack of grid connection, while also exploiting the higher capacity factors. Towards this direction, on-board energy storage in the form of hydrogen production is one of the most promising solutions, often cited in literature. This study aims to perform a preliminary techno-economic analysis to assess the trade-offs, in terms of cost, between a far offshore grid-connected (GC) floating wind farm and a NGC wind farm integrated with an electrolyser for the production of hydrogen. To this end, a lifecycle techno-economic model coupled with an O&M model developed for offshore wind installations are employed. The model is applied to a hypothetical wind farm located 200km from the shore. For the GC system, O&M costs along with the costs of acquisition of the electric system (offshore cable and offshore substation) appeared to be the main contributors to the Levelised Cost of Electricity (LCOE). As far as the NGC system is concerned, it was concluded that a higher annual capacity factor (>60%) could potentially achieve viability of the investment.
{"title":"A preliminary techno-economic comparison between a grid-connected and non-grid connected offshore floating wind farm","authors":"A. Ioannou, F. Brennan","doi":"10.1109/OSES.2019.8867350","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867350","url":null,"abstract":"Non-grid connected (NGC) floating offshore wind (OW) turbines can signify a solution for harvesting wind energy far offshore, addressing some key issues including the deep waters and lack of grid connection, while also exploiting the higher capacity factors. Towards this direction, on-board energy storage in the form of hydrogen production is one of the most promising solutions, often cited in literature. This study aims to perform a preliminary techno-economic analysis to assess the trade-offs, in terms of cost, between a far offshore grid-connected (GC) floating wind farm and a NGC wind farm integrated with an electrolyser for the production of hydrogen. To this end, a lifecycle techno-economic model coupled with an O&M model developed for offshore wind installations are employed. The model is applied to a hypothetical wind farm located 200km from the shore. For the GC system, O&M costs along with the costs of acquisition of the electric system (offshore cable and offshore substation) appeared to be the main contributors to the Levelised Cost of Electricity (LCOE). As far as the NGC system is concerned, it was concluded that a higher annual capacity factor (>60%) could potentially achieve viability of the investment.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126043927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867204
Ho-Seong Yang, Hyeonsoo Park, Young-Ho Lee
In this paper, unlike existing generation methods of using wind and ocean current energy, a combined power generation method is used. This device uses a kite to generate higher amount of energy generation compare to turbine type generation assuming that the rotor disc area and kite area are same. The method of using the kite has advantages in terms of cost and the quantity of energy that could be secured. The windy coastal areas have a fast ocean current velocity. So it is possible to increase total energy generation by combining wind and ocean current power on one platform. The ultimate conclusions are as follows: (1) Enlarging the kite area increases the available energy and reduce the costs of installation and unit generation. (2) Compared with existing wind and ocean current power generators that use turbine, maintenance is easier than original. (3) In complex power generation as mentioned, the parts of obtaining energy are different with general wind power generation and ocean power generation. This parts are not fixed but moving in the side of wind direction and the side of ocean current flow direction. So more large energy can be obtained even at low wind and ocean current flow. Particularly, the ESS method of using the head of water drop is easy to apply to this complex power generation platform.
{"title":"The design of combined energy generation using airborne and ocean current kites in offshore","authors":"Ho-Seong Yang, Hyeonsoo Park, Young-Ho Lee","doi":"10.1109/OSES.2019.8867204","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867204","url":null,"abstract":"In this paper, unlike existing generation methods of using wind and ocean current energy, a combined power generation method is used. This device uses a kite to generate higher amount of energy generation compare to turbine type generation assuming that the rotor disc area and kite area are same. The method of using the kite has advantages in terms of cost and the quantity of energy that could be secured. The windy coastal areas have a fast ocean current velocity. So it is possible to increase total energy generation by combining wind and ocean current power on one platform. The ultimate conclusions are as follows: (1) Enlarging the kite area increases the available energy and reduce the costs of installation and unit generation. (2) Compared with existing wind and ocean current power generators that use turbine, maintenance is easier than original. (3) In complex power generation as mentioned, the parts of obtaining energy are different with general wind power generation and ocean power generation. This parts are not fixed but moving in the side of wind direction and the side of ocean current flow direction. So more large energy can be obtained even at low wind and ocean current flow. Particularly, the ESS method of using the head of water drop is easy to apply to this complex power generation platform.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127129670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/OSES.2019.8867322
D. Buhagiar, T. Sant, R. Farrugia
With increasing implementation of offshore wind, power the need for offshore-based energy storage technologies is also expected to grow. This is particularly relevant for floating wind, which will tend to be a late-comer to the grid, and face more significant integration challenges. The present work focusses on such an offshore-tailored solution, relying on a hydro-pneumatic liquid piston concept. A small-scale experimental set-up was installed at a sheltered location in the central Mediterranean island of Malta. The system operated for over a year, undergoing hundreds of charging-discharging cycles. Results from this experimental campaign show that the cycle performance is favorable, with a consistently high thermal efficiency (> 93%) across the year. A numerical tool developed to predict the performance of the proposed storage system is validated against this experimental data. A sensitivity analysis of the heat transfer coefficients, which are particularly difficult to accurately predict numerically, indicates that variations of up to ± 50% in these coefficients translate into very minimal changes in the predicted cycle performance. Overall, the numerical tool was shown to be in good agreement with the experimental data, and is generally more conservative when it comes to predicting the efficiency.
{"title":"Marine Testing of a Small-scale Prototype of the FLASC Offshore Energy Storage System","authors":"D. Buhagiar, T. Sant, R. Farrugia","doi":"10.1109/OSES.2019.8867322","DOIUrl":"https://doi.org/10.1109/OSES.2019.8867322","url":null,"abstract":"With increasing implementation of offshore wind, power the need for offshore-based energy storage technologies is also expected to grow. This is particularly relevant for floating wind, which will tend to be a late-comer to the grid, and face more significant integration challenges. The present work focusses on such an offshore-tailored solution, relying on a hydro-pneumatic liquid piston concept. A small-scale experimental set-up was installed at a sheltered location in the central Mediterranean island of Malta. The system operated for over a year, undergoing hundreds of charging-discharging cycles. Results from this experimental campaign show that the cycle performance is favorable, with a consistently high thermal efficiency (> 93%) across the year. A numerical tool developed to predict the performance of the proposed storage system is validated against this experimental data. A sensitivity analysis of the heat transfer coefficients, which are particularly difficult to accurately predict numerically, indicates that variations of up to ± 50% in these coefficients translate into very minimal changes in the predicted cycle performance. Overall, the numerical tool was shown to be in good agreement with the experimental data, and is generally more conservative when it comes to predicting the efficiency.","PeriodicalId":416860,"journal":{"name":"2019 Offshore Energy and Storage Summit (OSES)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128594309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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