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Papers by Mehmet Emin akdogan

Research paper thumbnail of Energy Storage System (ESS) for Compensating Unbalanced Multi-microgrids Using Modified Reverse Droop Control

arXiv (Cornell University), Apr 9, 2021

The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality... more The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality problems such as unbalanced voltage and voltage rise at the point of common coupling (PCC) of the MGs. In this paper, a modified reverse droop control (MRDC) scheme in the Energy Storage System (ESS) is proposed to improve the three-phase PCC voltage quality in multi-microgrids (MMG). The MRDC consists of a reactive power compensator (RPC) and a voltage compensator. The controller regulates the reactive power and voltage unbalance of the MMG by using the reactive power produced by the ESS. The effectiveness of this proposed scheme is verified in real-time simulation using the Opal-RT OP5600 real-time simulator. The voltage unbalance factor (VUF) at the PCC is decreased from 3.6 percent to 0.25 percent, while the reactive power is reduced significantly at the single-phase load. Index Terms-Unbalanced voltage compensation, reactive power compensation, reverse droop control, distributed generations, PV islanded, energy storage system, voltage controlled inverters, multi-microgrids, power quality.

Research paper thumbnail of In-depth analysis of SARS-CoV-2–specific T cells reveals diverse differentiation hierarchies in vaccinated individuals

Research paper thumbnail of Improving Power Quality and Power Sharing in Unbalanced Multi-Microgrids Using Energy Storage System

2021 IEEE Applied Power Electronics Conference and Exposition (APEC), 2021

The integration of single-phase distributed generations (DG) and unbalanced loads to three-phase ... more The integration of single-phase distributed generations (DG) and unbalanced loads to three-phase DGs brings challenges to the operating system of the microgrids (MGs). These challenges include unbalanced voltage and unequal power flow at the point of common coupling (PCC) of the MGs. The aim of this paper is to develop an Energy Storage System (ESS) with multi-function control for islanded multi-microgrids (MMG) consisting of single and three PV-DGs to enhance its power quality and power sharing of the MMGs. The proposed multifunction control consists of a reactive power compensation (RPC), a PCC power balance regulator (PBR) and a reactive power sharing algorithm (RPSA). The RPC and the PBR improve the three-phase PCC voltage and power unbalance of the MMG and the RPSA regulates the reactive power sharing among the MMGs. The proposed strategy is experimentally validated on the Opal-RT OP5600 real-time simulator. The voltage unbalance factor (VUF) at the PCC is reduced from 4.3 percent to 0.03 percent, while the three phase and the single phase reactive powers are shared proportionally between different rated DGs.

Research paper thumbnail of Control Hardware-in-the-loop for Voltage Controlled Inverters with Unbalanced and Non-linear Loads in Stand-alone Photovoltaic (PV) Islanded Microgrids

2020 IEEE Energy Conversion Congress and Exposition (ECCE), 2020

Unbalanced and nonlinear loads connected to micro grids (MG) with local distributed energy resour... more Unbalanced and nonlinear loads connected to micro grids (MG) with local distributed energy resources (DERs) are two of the leading causes of power quality problems. Nonlinear loads introduce voltage and current harmonics, and single phase loads can cause voltage and current imbalances in a three phase network. This paper presents a hierarchical control scheme for voltage controlled photovoltaic (PV) inverters with unbalanced and nonlinear loads in micro-grids. The hierarchical control consists of primary control and voltage compensation control (VCC) and a DC voltage regulator (VR). The primary control scheme controls active and reactive power sharing and the VCC regulates the unbalanced voltage and harmonics distortion. The effectiveness of the scheme is verified using Opal-RT real-time simulation and experimentally using control hardware-in-theloop. The voltage distortion at point of common coupling (PCC) decreased from 6.38 percent to 1.91 percent after compensation, while the unbalanced and harmonic load are shared proportionally among the DG units. Index Terms-Unbalanced and harmonic compensation, distributed generations, PV islanded, voltage controlled inverters, microgrid

Research paper thumbnail of Energy Storage System (ESS) for Compensating Unbalanced Multi-microgrids Using Modified Reverse Droop Control

2021 IEEE Applied Power Electronics Conference and Exposition (APEC), 2021

The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality... more The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality problems such as unbalanced voltage and voltage rise at the point of common coupling (PCC) of the MGs. In this paper, a modified reverse droop control (MRDC) scheme in the Energy Storage System (ESS) is proposed to improve the three-phase PCC voltage quality in multi-microgrids (MMG). The MRDC consists of a reactive power compensator (RPC) and a voltage compensator. The controller regulates the reactive power and voltage unbalance of the MMG by using the reactive power produced by the ESS. The effectiveness of this proposed scheme is verified in real-time simulation using the Opal-RT OP5600 real-time simulator. The voltage unbalance factor (VUF) at the PCC is decreased from 3.6 percent to 0.25 percent, while the reactive power is reduced significantly at the single-phase load. Index Terms-Unbalanced voltage compensation, reactive power compensation, reverse droop control, distributed generations, PV islanded, energy storage system, voltage controlled inverters, multi-microgrids, power quality.

Research paper thumbnail of Energy Storage System (ESS) for Compensating Unbalanced Multi-microgrids Using Modified Reverse Droop Control

arXiv (Cornell University), Apr 9, 2021

The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality... more The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality problems such as unbalanced voltage and voltage rise at the point of common coupling (PCC) of the MGs. In this paper, a modified reverse droop control (MRDC) scheme in the Energy Storage System (ESS) is proposed to improve the three-phase PCC voltage quality in multi-microgrids (MMG). The MRDC consists of a reactive power compensator (RPC) and a voltage compensator. The controller regulates the reactive power and voltage unbalance of the MMG by using the reactive power produced by the ESS. The effectiveness of this proposed scheme is verified in real-time simulation using the Opal-RT OP5600 real-time simulator. The voltage unbalance factor (VUF) at the PCC is decreased from 3.6 percent to 0.25 percent, while the reactive power is reduced significantly at the single-phase load. Index Terms-Unbalanced voltage compensation, reactive power compensation, reverse droop control, distributed generations, PV islanded, energy storage system, voltage controlled inverters, multi-microgrids, power quality.

Research paper thumbnail of In-depth analysis of SARS-CoV-2–specific T cells reveals diverse differentiation hierarchies in vaccinated individuals

Research paper thumbnail of Improving Power Quality and Power Sharing in Unbalanced Multi-Microgrids Using Energy Storage System

2021 IEEE Applied Power Electronics Conference and Exposition (APEC), 2021

The integration of single-phase distributed generations (DG) and unbalanced loads to three-phase ... more The integration of single-phase distributed generations (DG) and unbalanced loads to three-phase DGs brings challenges to the operating system of the microgrids (MGs). These challenges include unbalanced voltage and unequal power flow at the point of common coupling (PCC) of the MGs. The aim of this paper is to develop an Energy Storage System (ESS) with multi-function control for islanded multi-microgrids (MMG) consisting of single and three PV-DGs to enhance its power quality and power sharing of the MMGs. The proposed multifunction control consists of a reactive power compensation (RPC), a PCC power balance regulator (PBR) and a reactive power sharing algorithm (RPSA). The RPC and the PBR improve the three-phase PCC voltage and power unbalance of the MMG and the RPSA regulates the reactive power sharing among the MMGs. The proposed strategy is experimentally validated on the Opal-RT OP5600 real-time simulator. The voltage unbalance factor (VUF) at the PCC is reduced from 4.3 percent to 0.03 percent, while the three phase and the single phase reactive powers are shared proportionally between different rated DGs.

Research paper thumbnail of Control Hardware-in-the-loop for Voltage Controlled Inverters with Unbalanced and Non-linear Loads in Stand-alone Photovoltaic (PV) Islanded Microgrids

2020 IEEE Energy Conversion Congress and Exposition (ECCE), 2020

Unbalanced and nonlinear loads connected to micro grids (MG) with local distributed energy resour... more Unbalanced and nonlinear loads connected to micro grids (MG) with local distributed energy resources (DERs) are two of the leading causes of power quality problems. Nonlinear loads introduce voltage and current harmonics, and single phase loads can cause voltage and current imbalances in a three phase network. This paper presents a hierarchical control scheme for voltage controlled photovoltaic (PV) inverters with unbalanced and nonlinear loads in micro-grids. The hierarchical control consists of primary control and voltage compensation control (VCC) and a DC voltage regulator (VR). The primary control scheme controls active and reactive power sharing and the VCC regulates the unbalanced voltage and harmonics distortion. The effectiveness of the scheme is verified using Opal-RT real-time simulation and experimentally using control hardware-in-theloop. The voltage distortion at point of common coupling (PCC) decreased from 6.38 percent to 1.91 percent after compensation, while the unbalanced and harmonic load are shared proportionally among the DG units. Index Terms-Unbalanced and harmonic compensation, distributed generations, PV islanded, voltage controlled inverters, microgrid

Research paper thumbnail of Energy Storage System (ESS) for Compensating Unbalanced Multi-microgrids Using Modified Reverse Droop Control

2021 IEEE Applied Power Electronics Conference and Exposition (APEC), 2021

The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality... more The connection of single-phase microgrids (MG) and loads to three-phase MGs creates power quality problems such as unbalanced voltage and voltage rise at the point of common coupling (PCC) of the MGs. In this paper, a modified reverse droop control (MRDC) scheme in the Energy Storage System (ESS) is proposed to improve the three-phase PCC voltage quality in multi-microgrids (MMG). The MRDC consists of a reactive power compensator (RPC) and a voltage compensator. The controller regulates the reactive power and voltage unbalance of the MMG by using the reactive power produced by the ESS. The effectiveness of this proposed scheme is verified in real-time simulation using the Opal-RT OP5600 real-time simulator. The voltage unbalance factor (VUF) at the PCC is decreased from 3.6 percent to 0.25 percent, while the reactive power is reduced significantly at the single-phase load. Index Terms-Unbalanced voltage compensation, reactive power compensation, reverse droop control, distributed generations, PV islanded, energy storage system, voltage controlled inverters, multi-microgrids, power quality.