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Papers by yusef esa

2023 IEEE PES Conference on Innovative Smart Grid Technologies - Middle East (ISGT Middle East)

2017 IEEE Industry Applications Society Annual Meeting, 2017

2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA), 2017

2018 IEEE Energy Conversion Congress and Exposition (ECCE), 2018

This paper investigates the effect of wireless communication technologies latency on the converte... more This paper investigates the effect of wireless communication technologies latency on the converters and the bus voltage of centrally communication based controlled DC microgrids (MGs) during islanding. A DC microgrid with its communication based control scheme was modeled to show the impact of latency. Simulation results show that the impact may be severe depending on the design, and the operational condition of the microgrid before latency occurs.

2017 IEEE Industry Applications Society Annual Meeting, 2017

B. Regenerative energy Eregen Regenerative energy of the train during deceleration. ET Total ener... more B. Regenerative energy Eregen Regenerative energy of the train during deceleration. ET Total energy during a train complete cycle. Ksp Rate of the train speed during deceleration. Pelec Electrical power of the train during a cycle. Pregen Regenerative power of the train during deceleration. Pm Mechanical Power. s Motor slip. to Starting time of the powering mode. tc Staring time of the coasting mode. td Starting time of the braking mode. ts Time when the train stops. Vmax Maximum speed of the train just before it starts decelerating.

2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA), 2017

2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT), 2017

IEEE Transactions on Sustainable Energy, 2018

Maintaining a sustainable and reliable source of energy to supply critical loads within a renewab... more Maintaining a sustainable and reliable source of energy to supply critical loads within a renewable energy based microgrid (MG) during blackouts is directly related to its bus voltage variations. For example, voltage variation might trigger protection devices and disconnect DERs within the MG. Centrally controlled MGs (CCMGs) type is dependent on communication. Therefore, it is very important to analyze the impact of communication networks performance degradation, such as latency, on the bus voltage of CCMGs. This paper investigates the effect of wireless communication technologies latency on the bus voltage and performance of DC CCMGs and how to mitigate it. Two mathematical models were developed to describe and predict the behavior of MGs during latency. As a case study, a renewable energy-based DC MG with its centralized control scheme was simulated to validate and compare the developed mathematical models. Results verify the accuracy of the developed models and show that the impact may be severe depending on the design, and the operational condition of the MG before latency occurs.

Energies, 2018

This paper provides a review of the research conducted on complex network analysis (CAN) in elect... more This paper provides a review of the research conducted on complex network analysis (CAN) in electric power systems. Moreover, a new approach is presented to find optimal locations for microgrids (MGs) in electric distribution systems (EDS) utilizing complex network analysis. The optimal placement in this paper points to the location that will result in enhanced grid resilience, reduced power losses and line loading, better voltage stability, and a supply to critical loads during a blackout. The criteria used to point out the optimal placement of the MGs were predicated on the centrality analysis selected from the complex network theory, the center of mass (COM) concept from physics, and the recently developed controlled delivery grid (CDG) model. An IEEE 30 bus network was utilized as a case study. Results using MATLAB (MathWorks, Inc., Nattick, MA, USA) and PowerWorld (PowerWorld Corporation, Champaign, IL, USA) demonstrate the usefulness of the proposed approach for MGs placement.

IEEE Transactions on Smart Grid, 2019

Centralized communication-based control is one of the main methods that can be implemented to ach... more Centralized communication-based control is one of the main methods that can be implemented to achieve autonomous advanced energy management capabilities in DC microgrids. However, its major limitation is the fact that communication bandwidth and computation resources are limited in practical applications. This can be often improved by avoiding redundant communications and complex computations. In this paper, an autonomous communication-based hybrid state/event driven control scheme is proposed. This control scheme is hierarchical and heuristic, such that on the primary control level, it encompasses state-driven local controllers, and on the secondary control level, an event-driven MG centralized controller (MGCC) is used. This heuristic hybrid control system aims at reducing the communication load and complexity, processor computations, and consequently system cost while maintaining reliable autonomous operation during all possible scenarios. A mathematical model for the proposed control scheme using Finite State Machines (FSM) has been developed and used to cover all the possible modes/sub-modes of operation, and assure seamless transitions among them during various events. Results of some case studies involving severe operational scenarios were presented and discussed. Results verify the validity and effectiveness of the proposed communication-based control scheme.

2015 International Conference on Smart Grid and Clean Energy Technologies (ICSGCE), 2015

In this paper, the impact of clustering multiple microgrids during blackouts, on their stability ... more In this paper, the impact of clustering multiple microgrids during blackouts, on their stability and supply availability, will be investigated. Microgrids have the capability of satisfying their emergency loads during blackouts. However, distributed energy resources (DERs)-dominated microgrids are affected by the uncertainty of their input energy supply, e.g. impact of solar irradiance on photovoltaic (PV) output. Moreover, an individual islanded microgrid is prone to instability issues due to large sudden load/generation changes. In order to increase the supply security, and enhance system stability, we propose to use the existing distribution grid infrastructure, if applicable, during blackouts to form microgrid clusters. The paper discusses the required control hierarchy required to manage the microgrid clusters, and communicate with the Distribution Network Operator (DNO). A case study based on the 13-bus standard distribution feeder, and two microgrid models, is presented. Results show that microgrids clustering helps improve their performance and that the microgrid generator inertia has a direct impact on the stability of the microgrid cluster.

2016 IEEE Industry Applications Society Annual Meeting, 2016

In this paper, the impact of clustering multiple microgrids during blackouts, on their stability ... more In this paper, the impact of clustering multiple microgrids during blackouts, on their stability and supply availability, will be investigated. Microgrids have the capability of satisfying their emergency loads during blackouts. However, distributed energy resources (DERs)-dominated microgrids are affected by the uncertainty of their input energy supply, e.g. impact of solar irradiance on photovoltaic (PV) output. Moreover, an individual islanded microgrid is prone to instability issues due to large sudden load/generation changes. In order to increase the supply security, and enhance system stability, we propose to use the existing distribution grid infrastructure, if applicable, during blackouts to form microgrid clusters. The paper discusses the required control hierarchy required to manage the microgrid clusters, and communicate with the Distribution Network Operator (DNO). A case study based on the 13-bus standard distribution feeder, and two microgrid models, is presented. Results show that microgrids clustering helps improve their performance and that the microgrid generator inertia has a direct impact on the stability of the microgrid cluster.

2023 IEEE PES Conference on Innovative Smart Grid Technologies - Middle East (ISGT Middle East)

2017 IEEE Industry Applications Society Annual Meeting, 2017

2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA), 2017

2018 IEEE Energy Conversion Congress and Exposition (ECCE), 2018

This paper investigates the effect of wireless communication technologies latency on the converte... more This paper investigates the effect of wireless communication technologies latency on the converters and the bus voltage of centrally communication based controlled DC microgrids (MGs) during islanding. A DC microgrid with its communication based control scheme was modeled to show the impact of latency. Simulation results show that the impact may be severe depending on the design, and the operational condition of the microgrid before latency occurs.

2017 IEEE Industry Applications Society Annual Meeting, 2017

B. Regenerative energy Eregen Regenerative energy of the train during deceleration. ET Total ener... more B. Regenerative energy Eregen Regenerative energy of the train during deceleration. ET Total energy during a train complete cycle. Ksp Rate of the train speed during deceleration. Pelec Electrical power of the train during a cycle. Pregen Regenerative power of the train during deceleration. Pm Mechanical Power. s Motor slip. to Starting time of the powering mode. tc Staring time of the coasting mode. td Starting time of the braking mode. ts Time when the train stops. Vmax Maximum speed of the train just before it starts decelerating.

2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA), 2017

2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT), 2017

IEEE Transactions on Sustainable Energy, 2018

Maintaining a sustainable and reliable source of energy to supply critical loads within a renewab... more Maintaining a sustainable and reliable source of energy to supply critical loads within a renewable energy based microgrid (MG) during blackouts is directly related to its bus voltage variations. For example, voltage variation might trigger protection devices and disconnect DERs within the MG. Centrally controlled MGs (CCMGs) type is dependent on communication. Therefore, it is very important to analyze the impact of communication networks performance degradation, such as latency, on the bus voltage of CCMGs. This paper investigates the effect of wireless communication technologies latency on the bus voltage and performance of DC CCMGs and how to mitigate it. Two mathematical models were developed to describe and predict the behavior of MGs during latency. As a case study, a renewable energy-based DC MG with its centralized control scheme was simulated to validate and compare the developed mathematical models. Results verify the accuracy of the developed models and show that the impact may be severe depending on the design, and the operational condition of the MG before latency occurs.

Energies, 2018

This paper provides a review of the research conducted on complex network analysis (CAN) in elect... more This paper provides a review of the research conducted on complex network analysis (CAN) in electric power systems. Moreover, a new approach is presented to find optimal locations for microgrids (MGs) in electric distribution systems (EDS) utilizing complex network analysis. The optimal placement in this paper points to the location that will result in enhanced grid resilience, reduced power losses and line loading, better voltage stability, and a supply to critical loads during a blackout. The criteria used to point out the optimal placement of the MGs were predicated on the centrality analysis selected from the complex network theory, the center of mass (COM) concept from physics, and the recently developed controlled delivery grid (CDG) model. An IEEE 30 bus network was utilized as a case study. Results using MATLAB (MathWorks, Inc., Nattick, MA, USA) and PowerWorld (PowerWorld Corporation, Champaign, IL, USA) demonstrate the usefulness of the proposed approach for MGs placement.

IEEE Transactions on Smart Grid, 2019

Centralized communication-based control is one of the main methods that can be implemented to ach... more Centralized communication-based control is one of the main methods that can be implemented to achieve autonomous advanced energy management capabilities in DC microgrids. However, its major limitation is the fact that communication bandwidth and computation resources are limited in practical applications. This can be often improved by avoiding redundant communications and complex computations. In this paper, an autonomous communication-based hybrid state/event driven control scheme is proposed. This control scheme is hierarchical and heuristic, such that on the primary control level, it encompasses state-driven local controllers, and on the secondary control level, an event-driven MG centralized controller (MGCC) is used. This heuristic hybrid control system aims at reducing the communication load and complexity, processor computations, and consequently system cost while maintaining reliable autonomous operation during all possible scenarios. A mathematical model for the proposed control scheme using Finite State Machines (FSM) has been developed and used to cover all the possible modes/sub-modes of operation, and assure seamless transitions among them during various events. Results of some case studies involving severe operational scenarios were presented and discussed. Results verify the validity and effectiveness of the proposed communication-based control scheme.

2015 International Conference on Smart Grid and Clean Energy Technologies (ICSGCE), 2015

In this paper, the impact of clustering multiple microgrids during blackouts, on their stability ... more In this paper, the impact of clustering multiple microgrids during blackouts, on their stability and supply availability, will be investigated. Microgrids have the capability of satisfying their emergency loads during blackouts. However, distributed energy resources (DERs)-dominated microgrids are affected by the uncertainty of their input energy supply, e.g. impact of solar irradiance on photovoltaic (PV) output. Moreover, an individual islanded microgrid is prone to instability issues due to large sudden load/generation changes. In order to increase the supply security, and enhance system stability, we propose to use the existing distribution grid infrastructure, if applicable, during blackouts to form microgrid clusters. The paper discusses the required control hierarchy required to manage the microgrid clusters, and communicate with the Distribution Network Operator (DNO). A case study based on the 13-bus standard distribution feeder, and two microgrid models, is presented. Results show that microgrids clustering helps improve their performance and that the microgrid generator inertia has a direct impact on the stability of the microgrid cluster.

2016 IEEE Industry Applications Society Annual Meeting, 2016

In this paper, the impact of clustering multiple microgrids during blackouts, on their stability ... more In this paper, the impact of clustering multiple microgrids during blackouts, on their stability and supply availability, will be investigated. Microgrids have the capability of satisfying their emergency loads during blackouts. However, distributed energy resources (DERs)-dominated microgrids are affected by the uncertainty of their input energy supply, e.g. impact of solar irradiance on photovoltaic (PV) output. Moreover, an individual islanded microgrid is prone to instability issues due to large sudden load/generation changes. In order to increase the supply security, and enhance system stability, we propose to use the existing distribution grid infrastructure, if applicable, during blackouts to form microgrid clusters. The paper discusses the required control hierarchy required to manage the microgrid clusters, and communicate with the Distribution Network Operator (DNO). A case study based on the 13-bus standard distribution feeder, and two microgrid models, is presented. Results show that microgrids clustering helps improve their performance and that the microgrid generator inertia has a direct impact on the stability of the microgrid cluster.