Pub Date : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548174
D. Banks, Johannes Cornelius Bekker, H. Vermeulen
This paper proposes the use of the Pseudo-Random Impulse Sequence as perturbation signal for estimating the parameters of a lumped parameter circuit model commonly used in the wideband modelling of distributed transformer windings. Impedance and voltage ratio transfer functions are derived analytically for the model and the associated frequency responses are determined. These results are used to validate the frequency responses simulated using a Pseudo-Random Impulse Sequence perturbation signal. A constrained Globalsearch optimisation algorithm is used to estimate the model parameters, where the cost function is defined in terms of the frequency responses of various transfer functions. A total of five case studies are investigated. The results show that the proposed method is suitable for estimating the parameters of the target system with a fair degree of accuracy. Inclusion of a midpoint voltage in the parameter estimation process allows for most parameters to be estimated with accuracy of the order of 1%.
{"title":"Parameter Estimation of a Two-Section Transformer Winding Model using Pseudo-Random Impulse Sequence Perturbation","authors":"D. Banks, Johannes Cornelius Bekker, H. Vermeulen","doi":"10.1109/UPEC50034.2021.9548174","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548174","url":null,"abstract":"This paper proposes the use of the Pseudo-Random Impulse Sequence as perturbation signal for estimating the parameters of a lumped parameter circuit model commonly used in the wideband modelling of distributed transformer windings. Impedance and voltage ratio transfer functions are derived analytically for the model and the associated frequency responses are determined. These results are used to validate the frequency responses simulated using a Pseudo-Random Impulse Sequence perturbation signal. A constrained Globalsearch optimisation algorithm is used to estimate the model parameters, where the cost function is defined in terms of the frequency responses of various transfer functions. A total of five case studies are investigated. The results show that the proposed method is suitable for estimating the parameters of the target system with a fair degree of accuracy. Inclusion of a midpoint voltage in the parameter estimation process allows for most parameters to be estimated with accuracy of the order of 1%.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127800910","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548218
Lydia S. M. Robinson, Ransheng Xu, S. Simdyankin, A. Gallant, A. Horsfall
The short circuit performance of silicon carbide MOSFETs has been evaluated in a 270 V system designed to mimic the characteristics of a commercial airliner power system. The devices demonstrated the ability to withstand being short–circuited for a period of 8 µs before suffering a catastrophic failure when that coincided with the turn–off transient for a 9 µs pulse. At the point of turn off the junction temperature in the transistor is calculated to have risen to approximately 950 °C. The withstand period for a transistor held at a case temperature of 150 °C was 7 µs, indicating the failure is of a thermal origin and this reduction needs to be addressed for devices operating in high temperature environments, such as those found in aerospace.
{"title":"MOSFETs under short circuit conditions for aeronautical applications","authors":"Lydia S. M. Robinson, Ransheng Xu, S. Simdyankin, A. Gallant, A. Horsfall","doi":"10.1109/UPEC50034.2021.9548218","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548218","url":null,"abstract":"The short circuit performance of silicon carbide MOSFETs has been evaluated in a 270 V system designed to mimic the characteristics of a commercial airliner power system. The devices demonstrated the ability to withstand being short–circuited for a period of 8 µs before suffering a catastrophic failure when that coincided with the turn–off transient for a 9 µs pulse. At the point of turn off the junction temperature in the transistor is calculated to have risen to approximately 950 °C. The withstand period for a transistor held at a case temperature of 150 °C was 7 µs, indicating the failure is of a thermal origin and this reduction needs to be addressed for devices operating in high temperature environments, such as those found in aerospace.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127383229","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548165
Andrea Schaefer, J. Hanson, G. Balzer
Harmonic and resonance analyses demand an appropriate frequency-dependent network model with specific network characteristics. Often these characteristics are not reflected in benchmark network models or a lack of data does not allow a precise network modeling. In this report, a methodology how to set up a simplified generic network model with desired characteristics based on the honeycomb approach is enhanced by frequency-dependent modeling. This includes new modeling approaches for external and downstream networks. Further, the harmonic background distortion is mapped including the zero and negative sequence to consider asymmetries in the network model for detailed harmonic studies. The methodology is demonstrated on an exemplary real transmission grid. The homogeneous network set-up leads to homogeneous busbar impedances and harmonic voltages, so that the impact of changes to the grid can be quantified easily. Consequently, it can be utilized for a large scope of applications such as harmonic studies on the impact of the rising use of underground cables in the transmission grid, or the increasing number of harmonic feed-ins due to the integration of renewable energy sources.
{"title":"Frequency-dependent Modeling of Generic Honeycomb Networks","authors":"Andrea Schaefer, J. Hanson, G. Balzer","doi":"10.1109/UPEC50034.2021.9548165","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548165","url":null,"abstract":"Harmonic and resonance analyses demand an appropriate frequency-dependent network model with specific network characteristics. Often these characteristics are not reflected in benchmark network models or a lack of data does not allow a precise network modeling. In this report, a methodology how to set up a simplified generic network model with desired characteristics based on the honeycomb approach is enhanced by frequency-dependent modeling. This includes new modeling approaches for external and downstream networks. Further, the harmonic background distortion is mapped including the zero and negative sequence to consider asymmetries in the network model for detailed harmonic studies. The methodology is demonstrated on an exemplary real transmission grid. The homogeneous network set-up leads to homogeneous busbar impedances and harmonic voltages, so that the impact of changes to the grid can be quantified easily. Consequently, it can be utilized for a large scope of applications such as harmonic studies on the impact of the rising use of underground cables in the transmission grid, or the increasing number of harmonic feed-ins due to the integration of renewable energy sources.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127462509","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548160
Abdulhamid Atia, Fatih Anayi, G. Min
It has been widely accepted in the literature that partial shading of a photovoltaic (PV) solar cell and light irradiance reduction among its whole surface have the same effect on its characteristics and parameters. This paper presents an experimental comparison between those two cases applied to a mono-crystalline silicon (mono-Si) solar cell. Two cases of opaque partial shading were compared with the corresponding irradiance levels on the whole cell surface. The comparison includes the electrical parameters, the current-voltage (I-V) curve and the power-voltage (P-V) curve. The results show that there is no significant difference observed between the two operational cases. Hence, the assumption that partial shading of a single cell is equivalent to irradiance reduction on its surface is valid.
{"title":"Comparing Shading With Irradiance Reduction Effects on Solar Cells Electrical Parameters","authors":"Abdulhamid Atia, Fatih Anayi, G. Min","doi":"10.1109/UPEC50034.2021.9548160","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548160","url":null,"abstract":"It has been widely accepted in the literature that partial shading of a photovoltaic (PV) solar cell and light irradiance reduction among its whole surface have the same effect on its characteristics and parameters. This paper presents an experimental comparison between those two cases applied to a mono-crystalline silicon (mono-Si) solar cell. Two cases of opaque partial shading were compared with the corresponding irradiance levels on the whole cell surface. The comparison includes the electrical parameters, the current-voltage (I-V) curve and the power-voltage (P-V) curve. The results show that there is no significant difference observed between the two operational cases. Hence, the assumption that partial shading of a single cell is equivalent to irradiance reduction on its surface is valid.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133764666","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548240
Jacopo Andrea Di Antonio, M. Longo, D. Zaninelli, F. Ferrise, Andrea Labombarda
The present work is aimed at finding a correspondence between registered consumes for a Battery Electric Vehicle, using a dedicated algorithm, and data available installing a MEMS sensors platform in a scenario which recreates on-road driving conditions. The Virtual Reality (VR) setup is described in its composition together with the placement of MEMS equipment to configurate optimal conditions for driving tests. In specific, the use of SensorTile.box by STMicroelectronics was described in its functioning and for the measurement acquisition chain process. Also, the consumption model is implemented through Unity3D and Matlab software to obtain an estimation of power, State of Charge (SoC) and energy required to perform the simulation path. Afterwards, considering the available literature, it is posed in consideration how the obtained measures from sensors can be useful for a primary characterization of drivers' behavior. Finally, these results for single users are related to the energy requests to determine if and at which level these parameters are also indicators of impact on consumers.
{"title":"MEMS-based Measurements in Virtual Reality: Setup an Electric Vehicle","authors":"Jacopo Andrea Di Antonio, M. Longo, D. Zaninelli, F. Ferrise, Andrea Labombarda","doi":"10.1109/UPEC50034.2021.9548240","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548240","url":null,"abstract":"The present work is aimed at finding a correspondence between registered consumes for a Battery Electric Vehicle, using a dedicated algorithm, and data available installing a MEMS sensors platform in a scenario which recreates on-road driving conditions. The Virtual Reality (VR) setup is described in its composition together with the placement of MEMS equipment to configurate optimal conditions for driving tests. In specific, the use of SensorTile.box by STMicroelectronics was described in its functioning and for the measurement acquisition chain process. Also, the consumption model is implemented through Unity3D and Matlab software to obtain an estimation of power, State of Charge (SoC) and energy required to perform the simulation path. Afterwards, considering the available literature, it is posed in consideration how the obtained measures from sensors can be useful for a primary characterization of drivers' behavior. Finally, these results for single users are related to the energy requests to determine if and at which level these parameters are also indicators of impact on consumers.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124553324","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548198
Akhtar Hussain Javed, P. Nguyen, J. Morren, J. Slootweg
Traditionally, distribution networks were designed for unidirectional flow of electricity, but due to integration of distributed energy resources there is bidirectional flow of power in the system. This bidirectional flow of power has given rise to new challenges in the distribution network. These challenges include voltage variations, fairness issue, protection problems and power system stability. Grid operators also require that all converters connecting these distributed energy resources with distribution network should have the fault ride through capabilities for system reliability. In this paper a summary of these challenges occurring due to integration of distributed energy resources in distribution network is described. Also, a review about the solutions for these challenges available in literature is presented.
{"title":"Review of Operational Challenges and Solutions for DER Integration with Distribution Networks","authors":"Akhtar Hussain Javed, P. Nguyen, J. Morren, J. Slootweg","doi":"10.1109/UPEC50034.2021.9548198","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548198","url":null,"abstract":"Traditionally, distribution networks were designed for unidirectional flow of electricity, but due to integration of distributed energy resources there is bidirectional flow of power in the system. This bidirectional flow of power has given rise to new challenges in the distribution network. These challenges include voltage variations, fairness issue, protection problems and power system stability. Grid operators also require that all converters connecting these distributed energy resources with distribution network should have the fault ride through capabilities for system reliability. In this paper a summary of these challenges occurring due to integration of distributed energy resources in distribution network is described. Also, a review about the solutions for these challenges available in literature is presented.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123943895","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548234
Marco Bertoncin, K. Sunderland, R. Turri
In this paper, the reasons behind the necessity for accurate and reliable test systems for network analysis are addressed, and the almost total absence of representative models for the European LV network is considered. Further, the possibility to exploit non-synthetic electric and geographical data, to build real networks is debated, along with a thorough demonstration of the potential in the work by Koirala et al. to prove the versatility of the tool – which also allows modular implementation of synthetic data – an altered version of the Non-Synthetic European Low Voltage Test System is developed. Distributed photovoltaic (PV) generation and plug-in electric vehicle (PEV) representative loads are integrated in a daily time series power flow analysis for different penetration levels. The results obtained from the stress test comply with the assertions of prior studies, with some exceptions. A moderated PV implementation – up to around 40% of the base energy absorption – is possible for appropriate voltage management, and widely improves the energy conditions, whilst PEV contributions to the load cannot be reduced because of mismatch. Furthermore, the research demonstrates that LV network capability to accommodate PV penetration is inversely proportional to PEV contribution to the load. To facilitate penetration, the implementation of regulation controls within the grid should be evaluated. Finally, concerns regarding power and voltage daily rate of change in the presence of high PV and PEV penetration are raised.
{"title":"Impact Analysis of PV and PEV integration with a Non-Synthetic European LV Test System","authors":"Marco Bertoncin, K. Sunderland, R. Turri","doi":"10.1109/UPEC50034.2021.9548234","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548234","url":null,"abstract":"In this paper, the reasons behind the necessity for accurate and reliable test systems for network analysis are addressed, and the almost total absence of representative models for the European LV network is considered. Further, the possibility to exploit non-synthetic electric and geographical data, to build real networks is debated, along with a thorough demonstration of the potential in the work by Koirala et al. to prove the versatility of the tool – which also allows modular implementation of synthetic data – an altered version of the Non-Synthetic European Low Voltage Test System is developed. Distributed photovoltaic (PV) generation and plug-in electric vehicle (PEV) representative loads are integrated in a daily time series power flow analysis for different penetration levels. The results obtained from the stress test comply with the assertions of prior studies, with some exceptions. A moderated PV implementation – up to around 40% of the base energy absorption – is possible for appropriate voltage management, and widely improves the energy conditions, whilst PEV contributions to the load cannot be reduced because of mismatch. Furthermore, the research demonstrates that LV network capability to accommodate PV penetration is inversely proportional to PEV contribution to the load. To facilitate penetration, the implementation of regulation controls within the grid should be evaluated. Finally, concerns regarding power and voltage daily rate of change in the presence of high PV and PEV penetration are raised.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"1954 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129600769","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548237
Steven Deacon, G. Taylor, I. Pisica
As the penetration of distributed energy resources in low voltage distribution systems continue, the risk that their integration presents to the smooth operation of power networks continues to rise. This is because, unlike traditional generation, renewable resources are unpredictable and generally attached to less flexible parts of the power transmission network. The solution is to encourage customers to make decisions in their usage of the power distribution network that ultimately helps keep the system stable and allow further distributed energy resources to be integrated into the network. In this context, a new peer-to-peer energy trading market is proposed, which offers prosumers an incentive to reduce trades between peers with high Impedance between them. These are usually peers located furthest from one another; this helps reduce line losses and congestion on the network. The market designed marketplace uses topology and impedance identification methods to calculate a fee reduction for each trade completed on the market. In addition, the market will use a continuous double auction clearing method to pair buyers and sellers efficiently while allowing them the opportunity to maximize the benefits they receive from taking part in the peer-to-peer market. Finally, power flow tracing is proposed to allow participants to see how their power flows through the network. The designed flow tracing graph will allow them the satisfaction of knowing that the power is being sent to/received from their trade partner, giving increased confidence in the peer-to-peer market.
{"title":"Peer-to-peer energy transactioning –a DSO-centric proposal","authors":"Steven Deacon, G. Taylor, I. Pisica","doi":"10.1109/UPEC50034.2021.9548237","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548237","url":null,"abstract":"As the penetration of distributed energy resources in low voltage distribution systems continue, the risk that their integration presents to the smooth operation of power networks continues to rise. This is because, unlike traditional generation, renewable resources are unpredictable and generally attached to less flexible parts of the power transmission network. The solution is to encourage customers to make decisions in their usage of the power distribution network that ultimately helps keep the system stable and allow further distributed energy resources to be integrated into the network. In this context, a new peer-to-peer energy trading market is proposed, which offers prosumers an incentive to reduce trades between peers with high Impedance between them. These are usually peers located furthest from one another; this helps reduce line losses and congestion on the network. The market designed marketplace uses topology and impedance identification methods to calculate a fee reduction for each trade completed on the market. In addition, the market will use a continuous double auction clearing method to pair buyers and sellers efficiently while allowing them the opportunity to maximize the benefits they receive from taking part in the peer-to-peer market. Finally, power flow tracing is proposed to allow participants to see how their power flows through the network. The designed flow tracing graph will allow them the satisfaction of knowing that the power is being sent to/received from their trade partner, giving increased confidence in the peer-to-peer market.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130704326","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548152
Zunaib Ali, G. Putrus, M. Marzband, M. B. Tookanlou, K. Saleem, P. K. Ray, B. Subudhi
The increased integration of distributed Renewable Energy Sources (RESs) and adoption of Electric Vehicles (EVs) require appropriate control and management of energy sources and EV charging. This becomes critical at the distribution system level, especially at a microgrid (MG) level. This control is required not only to mitigate the negative impacts of intermittent generation from RESs but also to make better use of available energy, reduce carbon footprint, maximize the overall profit of microgrid and increase energy autonomy by effective utilization of battery storage. This paper proposes a heuristic multi-agent based decentralized energy management approach for grid-connected MG. The MG comprises of active (controlled) and passive (uncontrolled) electrical loads, a photovoltaic (PV) system, battery energy storage system (BESS) and a charging post for electric vehicles. The proposed approach is aimed at optimizing the use of local energy generation from photovoltaic and smart energy utilization to serve electrical loads and EV as well as maximizing MG profit. The aim of the energy management is to supply local consumption at minimum cost and less dependency on the main grid supply. Utilizing energy available from RESs (PV and BESS), customers satisfaction (fulfilling local demand), considering uncertainty of renewable generation and load consumption and also taking into account technical constraint are the main strengths of the presented framework. Performance of the proposed algorithm is investigated under different operating conditions and its efficacy is verified.
{"title":"Heuristic Multi-Agent Control for Energy Management of Microgrids with Distributed Energy Sources","authors":"Zunaib Ali, G. Putrus, M. Marzband, M. B. Tookanlou, K. Saleem, P. K. Ray, B. Subudhi","doi":"10.1109/UPEC50034.2021.9548152","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548152","url":null,"abstract":"The increased integration of distributed Renewable Energy Sources (RESs) and adoption of Electric Vehicles (EVs) require appropriate control and management of energy sources and EV charging. This becomes critical at the distribution system level, especially at a microgrid (MG) level. This control is required not only to mitigate the negative impacts of intermittent generation from RESs but also to make better use of available energy, reduce carbon footprint, maximize the overall profit of microgrid and increase energy autonomy by effective utilization of battery storage. This paper proposes a heuristic multi-agent based decentralized energy management approach for grid-connected MG. The MG comprises of active (controlled) and passive (uncontrolled) electrical loads, a photovoltaic (PV) system, battery energy storage system (BESS) and a charging post for electric vehicles. The proposed approach is aimed at optimizing the use of local energy generation from photovoltaic and smart energy utilization to serve electrical loads and EV as well as maximizing MG profit. The aim of the energy management is to supply local consumption at minimum cost and less dependency on the main grid supply. Utilizing energy available from RESs (PV and BESS), customers satisfaction (fulfilling local demand), considering uncertainty of renewable generation and load consumption and also taking into account technical constraint are the main strengths of the presented framework. Performance of the proposed algorithm is investigated under different operating conditions and its efficacy is verified.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126856479","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 : 2021-08-31DOI: 10.1109/UPEC50034.2021.9548185
M. Atsever, O. Karacasu, M. H. Hocaoğlu
Over-current relay coordination plays a critical role for effective protection of networks since primary protection is based on over-current detection in distribution systems. Thus, optimal relay coordination must be ensured between relays in faulted condition, providing selectivity and fast operation. Therefore, relay coordination can be designed as an optimization problem with highly constrained equations in such networks.Linear programming, which is simple to be implemented and requires less computation time when compared other optimisation techniques, is widely employed for solving relay coordination problems. To achieve faster and selective protection a number of optimisation algorithms have, also, been customised for the purpose. Water Cycle Algorithm (WCA) is among them and has promising results, already, depicted in the literature.However, capacitive currents may jeopardize traditional optimisation process for earth faults. Thus, in this paper, performance analysis is carried out for earth faults in sample distribution networks constructed with overhead lines and underground cables, separately. The results show that in cabled networks, additional constraints are needed for the optimisation process to provide selectivity. Consequently, optimal relay settings and selective protection are ensured by adding proper constraints into optimisation problem in this paper.
{"title":"Optimal Overcurrent Relay Coordination in Distribution Networks","authors":"M. Atsever, O. Karacasu, M. H. Hocaoğlu","doi":"10.1109/UPEC50034.2021.9548185","DOIUrl":"https://doi.org/10.1109/UPEC50034.2021.9548185","url":null,"abstract":"Over-current relay coordination plays a critical role for effective protection of networks since primary protection is based on over-current detection in distribution systems. Thus, optimal relay coordination must be ensured between relays in faulted condition, providing selectivity and fast operation. Therefore, relay coordination can be designed as an optimization problem with highly constrained equations in such networks.Linear programming, which is simple to be implemented and requires less computation time when compared other optimisation techniques, is widely employed for solving relay coordination problems. To achieve faster and selective protection a number of optimisation algorithms have, also, been customised for the purpose. Water Cycle Algorithm (WCA) is among them and has promising results, already, depicted in the literature.However, capacitive currents may jeopardize traditional optimisation process for earth faults. Thus, in this paper, performance analysis is carried out for earth faults in sample distribution networks constructed with overhead lines and underground cables, separately. The results show that in cabled networks, additional constraints are needed for the optimisation process to provide selectivity. Consequently, optimal relay settings and selective protection are ensured by adding proper constraints into optimisation problem in this paper.","PeriodicalId":325389,"journal":{"name":"2021 56th International Universities Power Engineering Conference (UPEC)","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121140715","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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