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Papers by Silvanus D'silva

Research paper thumbnail of Artificial Intelligence-based Frequency Trajectory Prediction to Enhance Power Electronics-Dominated Grid Resiliency

2023 IEEE Power and Energy Conference at Illinois (PECI)

Research paper thumbnail of Multi-time Scale Synchronization and Adaptive Power Sharing Control Scheme for Grid Forming Inverters in a Power Electronics Dominated Grid

2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

Research paper thumbnail of Optimal Ratio of Grid-Forming to Grid-Following Inverters Towards Resilient Power Electronics Dominated Grids

2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

Research paper thumbnail of Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

IEEE Transactions on Industrial Electronics, 2023

Research paper thumbnail of AI-based Technique to Enhance Transient Response and Resiliency of Power Electronic Dominated Grids via Grid-Following Inverters

IEEE Transactions on Industrial Electronics

This paper presents a frequency restoration method to enhance power electronic dominated grid (PE... more This paper presents a frequency restoration method to enhance power electronic dominated grid (PEDG) resiliency and transient response via redefining grid following inverters (GFLIs) role at the grid-edge. An artificial intelligence-based power reference correction (AI-PRC) module is developed for GFLIs to autonomously adjust their power setpoints during transient disturbances. A detailed analytical validation is provided that shows control rules in PEDG intrinsically follow the underlying dynamic of the swing-based machines to extend its stability boundary. Considering this fact, comprehensive transient and steady state-based mathematical models are used for constructing the learning database of the proposed AI-PRC. The proposed training approach can deal with grid's characteristics alterations and uncertainties. Thus, this approach incorporates PEDG's effective variables that shapes its dynamic response during transient disturbances. Subsequently, a neural network is trained by Bayesian regularization algorithm (BRA) to realize the proposed AI-PRC scheme for frequency support via GFLIs. Several simulation and experimental case studies results validate the functionality of the proposed AI-PRC towards enhancing the PEDG's transient response and resiliency via GFLIs. The provided case studies demonstrate significant improvement in frequency restoration in response to transient disturbances.

Research paper thumbnail of On Design Challenges of Portable Nuclear Magnetic Resonance System

Journal of nuclear engineering, Apr 18, 2023

Research paper thumbnail of Grid-friendly photovoltaic systems via autonomous power reserve function

Master of ScienceDepartment of Electrical and Computer EngineeringHaitham Abu-RubMohammad Shadman... more Master of ScienceDepartment of Electrical and Computer EngineeringHaitham Abu-RubMohammad ShadmandThe ever-increasing energy demand along with the depleting fossil fuel reserves and climate change has compelled the incorporation of renewables-based energy generation in the conventional power systems. Furthermore, the abundant availability of solar energy coupled with the rapid advances in photovoltaic (PV) technology and their low deployment and maintenance costs facilitate the large share of PV generated power amongst the total contribution from renewable generation. However, the intermittent nature of solar irradiation causes stability issues in the high PV penetrated grid. This limits the large-scale integration of PV sources in the power grid. A potential solution to address this issue is mitigation using energy storage systems. However, the downsides are the high cost, low reliability, and short lifetime of the currently available energy storage technologies. Another alternativ...

Research paper thumbnail of Coordinated Power Reserve Control of PV Sources For Frequency Restoration in Power Electronics Dominated Grid

2022 3rd International Conference on Smart Grid and Renewable Energy (SGRE)

Research paper thumbnail of Smart Battery Cells for Maximum Utilization in Power Electronics Dominated Grids

2022 3rd International Conference on Smart Grid and Renewable Energy (SGRE)

Research paper thumbnail of Resonance Suppression based on Predictive Control of Grid-following Inverters with LCL Filter in Weak Grid Condition

This paper presents an effective resonance suppression control when grid interactive inverter wit... more This paper presents an effective resonance suppression control when grid interactive inverter with LCL filter experience weak grid conditions. The resonance suppression mechanism is based on finite-set model predictive control (FS- MPC) with adaptive cost function to alter the controller objectives seamlessly. The large parasitic impedance and low short circuit ratio (SCR) of weak grid challenges the operation of grid- connected inverters. Specifically, the LCL filter resonance may get excited, resulting in collapse of the inverter operation. To address this issue, an effective active damping approach is implemented in the proposed control. In the proposed active damping scheme for resonance suppression, the feedback currents are switched based on the operating conditions of inverter. During the stiff grid conditions, grid current serves as feedback to the controller. While in the weak grid conditions, the inverter current is selected as feedback signal. The toggling action between ...

Research paper thumbnail of Differential and Common Mode Active Resonance Damping Control for Shunt-less LCL Filter Based Grid-Connected PV Inverters

2019 IEEE Power and Energy Conference at Illinois (PECI), 2019

This paper presents a generalized Differential Mode (DM) and Common Mode (CM) active resonance da... more This paper presents a generalized Differential Mode (DM) and Common Mode (CM) active resonance damping control scheme for grid-connected Photovoltaic (PV) inverters that are based on a shunt-less LCL filter. The proposed technique is useful for applications where the utility grid is weak. This is because weak grid’s large stray inductance challenges the DM control stability. Likewise, it will be indicated in this work that weak grid’s improperly designed ground resistance influences the CM control stability. Thereby, this paper develops an active resonance damping scheme for both the DM and CM controls. The developed scheme requires sensing the filter capacitors’ DM and CM currents. Then, these supplementary parameters are fed-back in their respective control loop with a proportional gain. This scheme emulates a virtual damping resistor in-parallel with the filter capacitors in each control mode. The stability achievement of the modified control system is examined using Pole-Zero plots. Also, the theoretical analyses are confirmed on a 10 kW PV system that is synchronized with a 240VRMS/50Hz weak grid.

Research paper thumbnail of Towards Grid of Microgrids: Seamless Transition between Grid-Connected and Islanded Modes of Operation

IEEE Open Journal of the Industrial Electronics Society, 2020

With the ever-increasing number of blackouts in distribution systems arising from a variety of na... more With the ever-increasing number of blackouts in distribution systems arising from a variety of natural and manmade disasters, the frequent and necessary isolation/reconnection of loads without power deviations/fluctuations has become an important issue. Grid of microgrids (MG)s is a promising solution towards a highly resilient and efficient power grid operation. To facilitate this implementation, seamless transition with the utility grid is a key feature the today's MG control needs to possess. This transition ability is of great prominence, especially after the accelerated adaptation of distributed renewable energy sources (RES) in MGs. This ability of the MGs should ensure uninterrupted energy services to critical loads and infrastructures. Thus, the implementation of MG control strategies to enable smooth transition between grid-connected (GC) and islanded (IS) operation modes is mandatory. The control scheme implemented should therefore be capable of mitigating the stirring...

Research paper thumbnail of Microgrid Control Strategies for Seamless Transition Between Grid-Connected and Islanded Modes

2020 IEEE Texas Power and Energy Conference (TPEC), 2020

This paper provides a review of the control schemes implemented for microgrids (MGs) or grid clus... more This paper provides a review of the control schemes implemented for microgrids (MGs) or grid clusters to enable seamless transition between grid-connected (GC) and islanded (IS) modes of operation. Grid of MGs is a potential solution towards a resilient power grid with high penetration of renewable energy resources (RES). The deployed MGs must be capable of operating in both GC as well as IS mode of operation in the occurrence of anomalies or natural disasters. Such required ability of the MG will ensure uninterrupted energy services to critical loads and infrastructures. This mandates the implementation of control strategies to enable smooth transition of the MG between GC and IS modes and avoid deviations in voltage/current due to misalignment in phase and frequency during the transition process. The main purpose of this paper is to provide an overview of the challenges and existing techniques in literature to mitigate voltage and frequency (pmbV/pmbf)(\pmb{V}/\pmb{f})(pmbV/pmbf) fluctuations at the ...

Research paper thumbnail of On Stability of Hybrid Power Ramp Rate Control for High Photovoltaic Penetrated Grid

2020 IEEE Energy Conversion Congress and Exposition (ECCE)

This paper proposes a hybrid constant power generation - power ramp rate control (CPG-PRRC) schem... more This paper proposes a hybrid constant power generation - power ramp rate control (CPG-PRRC) scheme to regulate the ramp-rate of the power injected into the grid by a cluster of photovoltaic (PV) sources. The ramp-rate regulation of the injected PV active power is achieved dynamically in real-time under highly fluctuating PV ambient conditions and without considering PV forecasting data. The proposed hybrid CPG-PRRC control scheme integrates the concept of constant power generation with power ramp rate control to ensure mitigation of the potential voltage/ power fluctuations seen by the grid and protects it from source side instabilities. Moreover, the proposed scheme is capable of regulating the PV power ramp-rate within the set limit during power ramp-up as well as ramp-down scenarios and does so without the use of energy storage devices. The ramp-rate is regulated by maintaining the PV operation set– point on the left side of the maximum power point (MPP) and dynamically increasing or decreasing the power reference at a rate which is within the ramp limit. Furthermore, this paper addresses potential stability concerns for the PV architecture in hand with the CPG-PRRC. Several test scenarios are provided to verify the theoretical expectations.

Research paper thumbnail of On Stability of PV Clusters With Distributed Power Reserve Capability

IEEE Transactions on Industrial Electronics

Research paper thumbnail of Artificial Intelligence-based Frequency Trajectory Prediction to Enhance Power Electronics-Dominated Grid Resiliency

2023 IEEE Power and Energy Conference at Illinois (PECI)

Research paper thumbnail of Multi-time Scale Synchronization and Adaptive Power Sharing Control Scheme for Grid Forming Inverters in a Power Electronics Dominated Grid

2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

Research paper thumbnail of Optimal Ratio of Grid-Forming to Grid-Following Inverters Towards Resilient Power Electronics Dominated Grids

2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

Research paper thumbnail of Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

IEEE Transactions on Industrial Electronics, 2023

Research paper thumbnail of AI-based Technique to Enhance Transient Response and Resiliency of Power Electronic Dominated Grids via Grid-Following Inverters

IEEE Transactions on Industrial Electronics

This paper presents a frequency restoration method to enhance power electronic dominated grid (PE... more This paper presents a frequency restoration method to enhance power electronic dominated grid (PEDG) resiliency and transient response via redefining grid following inverters (GFLIs) role at the grid-edge. An artificial intelligence-based power reference correction (AI-PRC) module is developed for GFLIs to autonomously adjust their power setpoints during transient disturbances. A detailed analytical validation is provided that shows control rules in PEDG intrinsically follow the underlying dynamic of the swing-based machines to extend its stability boundary. Considering this fact, comprehensive transient and steady state-based mathematical models are used for constructing the learning database of the proposed AI-PRC. The proposed training approach can deal with grid's characteristics alterations and uncertainties. Thus, this approach incorporates PEDG's effective variables that shapes its dynamic response during transient disturbances. Subsequently, a neural network is trained by Bayesian regularization algorithm (BRA) to realize the proposed AI-PRC scheme for frequency support via GFLIs. Several simulation and experimental case studies results validate the functionality of the proposed AI-PRC towards enhancing the PEDG's transient response and resiliency via GFLIs. The provided case studies demonstrate significant improvement in frequency restoration in response to transient disturbances.

Research paper thumbnail of On Design Challenges of Portable Nuclear Magnetic Resonance System

Journal of nuclear engineering, Apr 18, 2023

Research paper thumbnail of Grid-friendly photovoltaic systems via autonomous power reserve function

Master of ScienceDepartment of Electrical and Computer EngineeringHaitham Abu-RubMohammad Shadman... more Master of ScienceDepartment of Electrical and Computer EngineeringHaitham Abu-RubMohammad ShadmandThe ever-increasing energy demand along with the depleting fossil fuel reserves and climate change has compelled the incorporation of renewables-based energy generation in the conventional power systems. Furthermore, the abundant availability of solar energy coupled with the rapid advances in photovoltaic (PV) technology and their low deployment and maintenance costs facilitate the large share of PV generated power amongst the total contribution from renewable generation. However, the intermittent nature of solar irradiation causes stability issues in the high PV penetrated grid. This limits the large-scale integration of PV sources in the power grid. A potential solution to address this issue is mitigation using energy storage systems. However, the downsides are the high cost, low reliability, and short lifetime of the currently available energy storage technologies. Another alternativ...

Research paper thumbnail of Coordinated Power Reserve Control of PV Sources For Frequency Restoration in Power Electronics Dominated Grid

2022 3rd International Conference on Smart Grid and Renewable Energy (SGRE)

Research paper thumbnail of Smart Battery Cells for Maximum Utilization in Power Electronics Dominated Grids

2022 3rd International Conference on Smart Grid and Renewable Energy (SGRE)

Research paper thumbnail of Resonance Suppression based on Predictive Control of Grid-following Inverters with LCL Filter in Weak Grid Condition

This paper presents an effective resonance suppression control when grid interactive inverter wit... more This paper presents an effective resonance suppression control when grid interactive inverter with LCL filter experience weak grid conditions. The resonance suppression mechanism is based on finite-set model predictive control (FS- MPC) with adaptive cost function to alter the controller objectives seamlessly. The large parasitic impedance and low short circuit ratio (SCR) of weak grid challenges the operation of grid- connected inverters. Specifically, the LCL filter resonance may get excited, resulting in collapse of the inverter operation. To address this issue, an effective active damping approach is implemented in the proposed control. In the proposed active damping scheme for resonance suppression, the feedback currents are switched based on the operating conditions of inverter. During the stiff grid conditions, grid current serves as feedback to the controller. While in the weak grid conditions, the inverter current is selected as feedback signal. The toggling action between ...

Research paper thumbnail of Differential and Common Mode Active Resonance Damping Control for Shunt-less LCL Filter Based Grid-Connected PV Inverters

2019 IEEE Power and Energy Conference at Illinois (PECI), 2019

This paper presents a generalized Differential Mode (DM) and Common Mode (CM) active resonance da... more This paper presents a generalized Differential Mode (DM) and Common Mode (CM) active resonance damping control scheme for grid-connected Photovoltaic (PV) inverters that are based on a shunt-less LCL filter. The proposed technique is useful for applications where the utility grid is weak. This is because weak grid’s large stray inductance challenges the DM control stability. Likewise, it will be indicated in this work that weak grid’s improperly designed ground resistance influences the CM control stability. Thereby, this paper develops an active resonance damping scheme for both the DM and CM controls. The developed scheme requires sensing the filter capacitors’ DM and CM currents. Then, these supplementary parameters are fed-back in their respective control loop with a proportional gain. This scheme emulates a virtual damping resistor in-parallel with the filter capacitors in each control mode. The stability achievement of the modified control system is examined using Pole-Zero plots. Also, the theoretical analyses are confirmed on a 10 kW PV system that is synchronized with a 240VRMS/50Hz weak grid.

Research paper thumbnail of Towards Grid of Microgrids: Seamless Transition between Grid-Connected and Islanded Modes of Operation

IEEE Open Journal of the Industrial Electronics Society, 2020

With the ever-increasing number of blackouts in distribution systems arising from a variety of na... more With the ever-increasing number of blackouts in distribution systems arising from a variety of natural and manmade disasters, the frequent and necessary isolation/reconnection of loads without power deviations/fluctuations has become an important issue. Grid of microgrids (MG)s is a promising solution towards a highly resilient and efficient power grid operation. To facilitate this implementation, seamless transition with the utility grid is a key feature the today's MG control needs to possess. This transition ability is of great prominence, especially after the accelerated adaptation of distributed renewable energy sources (RES) in MGs. This ability of the MGs should ensure uninterrupted energy services to critical loads and infrastructures. Thus, the implementation of MG control strategies to enable smooth transition between grid-connected (GC) and islanded (IS) operation modes is mandatory. The control scheme implemented should therefore be capable of mitigating the stirring...

Research paper thumbnail of Microgrid Control Strategies for Seamless Transition Between Grid-Connected and Islanded Modes

2020 IEEE Texas Power and Energy Conference (TPEC), 2020

This paper provides a review of the control schemes implemented for microgrids (MGs) or grid clus... more This paper provides a review of the control schemes implemented for microgrids (MGs) or grid clusters to enable seamless transition between grid-connected (GC) and islanded (IS) modes of operation. Grid of MGs is a potential solution towards a resilient power grid with high penetration of renewable energy resources (RES). The deployed MGs must be capable of operating in both GC as well as IS mode of operation in the occurrence of anomalies or natural disasters. Such required ability of the MG will ensure uninterrupted energy services to critical loads and infrastructures. This mandates the implementation of control strategies to enable smooth transition of the MG between GC and IS modes and avoid deviations in voltage/current due to misalignment in phase and frequency during the transition process. The main purpose of this paper is to provide an overview of the challenges and existing techniques in literature to mitigate voltage and frequency (pmbV/pmbf)(\pmb{V}/\pmb{f})(pmbV/pmbf) fluctuations at the ...

Research paper thumbnail of On Stability of Hybrid Power Ramp Rate Control for High Photovoltaic Penetrated Grid

2020 IEEE Energy Conversion Congress and Exposition (ECCE)

This paper proposes a hybrid constant power generation - power ramp rate control (CPG-PRRC) schem... more This paper proposes a hybrid constant power generation - power ramp rate control (CPG-PRRC) scheme to regulate the ramp-rate of the power injected into the grid by a cluster of photovoltaic (PV) sources. The ramp-rate regulation of the injected PV active power is achieved dynamically in real-time under highly fluctuating PV ambient conditions and without considering PV forecasting data. The proposed hybrid CPG-PRRC control scheme integrates the concept of constant power generation with power ramp rate control to ensure mitigation of the potential voltage/ power fluctuations seen by the grid and protects it from source side instabilities. Moreover, the proposed scheme is capable of regulating the PV power ramp-rate within the set limit during power ramp-up as well as ramp-down scenarios and does so without the use of energy storage devices. The ramp-rate is regulated by maintaining the PV operation set– point on the left side of the maximum power point (MPP) and dynamically increasing or decreasing the power reference at a rate which is within the ramp limit. Furthermore, this paper addresses potential stability concerns for the PV architecture in hand with the CPG-PRRC. Several test scenarios are provided to verify the theoretical expectations.

Research paper thumbnail of On Stability of PV Clusters With Distributed Power Reserve Capability

IEEE Transactions on Industrial Electronics