EPE Association: EPE 2020 - DS1j-1: Micro-Grids and Smart grids-1

EPE 2020 - DS1j-1: Micro-Grids and Smart grids-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2020 - DS1j-1: Micro-Grids and Smart grids-1

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   An Improved Control Strategy for Renewable energy sources (RES) based DC microgrid with enhanced System Stability and Control Performance
By MUHAMMAD ADNAN MUMTAZ [View]
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Abstract: With the increasing penetration of renewable energy sources (RESs) into electrical power systems, DC microgrids bring an appealing solution to overcome the integration challenges. Due to the massive integration of RES into the electrical power system among DC microgrids, critical challenges have been aroused in controller design and its operation. In large-scale DC microgrids, complexities and control requirements are complicated than small scale grid. Existing primary and secondary cooperative control structures rely on PI controllers that make them vulnerable at higher nodes. In this paper, by considering the DC microgrid control requirements, structural improvements have been suggested to improve controller stability and performance. A droop-less control scheme has been proposed in this paper by augmenting a finite gain controller in voltage loop with PI controller in the current control loop of DC/DC converter. A different strategy has been employed at distributed secondary control for the estimation of average voltage and current difference. The proposed droop-less controller offers several benefits such as simplicity in the control structure, higher stability, higher scalability, and overall better system reliability. The simulation results in MATLAB/Simulink setup verify the controller efficiency and feasibility. Moreover, voltage control bandwidth comparison analysis is presented while considering communication delays and in the presence of a higher system nodes.

   DC microgrid concept for mine environment
By Jooa PURSIAINEN [View]
[Download]

Abstract: The use of electric vehicles and inverter-controlled ventilation will increase in the future in underground mines. DC microgrids are analyzed during the last years to be used e.g. in solar and wind farms, ships and datacenters. The possibility to use DC microgrid in a mine production area is analyzed in this study. The steady-state calculations are done to choose the suitable DC voltage level, cable type and power level of converters. After that, the dynamic calculations are done by using simulation model to analyze the stability of the system. Based on the calculations, energy storage is added to the grid and the optimal location of the energy storage is analyzed.

   Differential flatness for smooth transition between grid-connected and standalone mode of three-phase inverter
By Abdelhakim SAIM [View]
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Abstract: In this paper, the use of flatness based control to achieve smooth transition between Grid Connected (GC) and Stand-Alone (SA) is investigated. The idea is to exploit the flatness proprieties to ensure smooth transition between GC and SA modes. The flatness control uses planned flat outputs to calculate the inverter controls that achieve disturbances rejection. The design of the proposed control is detailed and its effectiveness is evaluated.

   The Energy Ring to supply the Expoelectric'18 show with Renewable Energy Sources and Electric Vehicles
By Cristian CHILLÓN-ANTON [View]
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Abstract: The Expoelectric fair takes place every year in Barcelona (Spain) and is devoted to Renewable energy and Electric Mobility. Street trade shows and fairs usually use Diesel generators to provide energy to fair booths because the street infrastructure is not designed to supply these events. In the case of Expoelectric and its objectives, the organization has proposed to supply the fair booths with on-site renewable energy and the use of exposed electrical vehicles to provide storage, which makes excellent sense in this kind of events.This paper aims to show this experience and detail the system developed for this objective. The result is the development of a power electronics-based system able to generate the grid where other resources and storage elements are connected. This paper details the system but also the control and operation algorithms to operate the microgrid without any type of communication between all the elements connected to them.During the two days of the fair, the Energy Ring microgrid delivered energy to the booths, assuring the supply and power quality needed for all the equipment connected (lighting, freezers, EV chargers, and computers).

EPE 2020 - DS1j-1: Micro-Grids and Smart grids-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2020 - DS1j-1: Micro-Grids and Smart grids-1
	[return to parent folder]

	An Improved Control Strategy for Renewable energy sources (RES) based DC microgrid with enhanced System Stability and Control Performance By MUHAMMAD ADNAN MUMTAZ	[View] [Download]
Abstract: With the increasing penetration of renewable energy sources (RESs) into electrical power systems, DC microgrids bring an appealing solution to overcome the integration challenges. Due to the massive integration of RES into the electrical power system among DC microgrids, critical challenges have been aroused in controller design and its operation. In large-scale DC microgrids, complexities and control requirements are complicated than small scale grid. Existing primary and secondary cooperative control structures rely on PI controllers that make them vulnerable at higher nodes. In this paper, by considering the DC microgrid control requirements, structural improvements have been suggested to improve controller stability and performance. A droop-less control scheme has been proposed in this paper by augmenting a finite gain controller in voltage loop with PI controller in the current control loop of DC/DC converter. A different strategy has been employed at distributed secondary control for the estimation of average voltage and current difference. The proposed droop-less controller offers several benefits such as simplicity in the control structure, higher stability, higher scalability, and overall better system reliability. The simulation results in MATLAB/Simulink setup verify the controller efficiency and feasibility. Moreover, voltage control bandwidth comparison analysis is presented while considering communication delays and in the presence of a higher system nodes.

	DC microgrid concept for mine environment By Jooa PURSIAINEN	[View] [Download]
Abstract: The use of electric vehicles and inverter-controlled ventilation will increase in the future in underground mines. DC microgrids are analyzed during the last years to be used e.g. in solar and wind farms, ships and datacenters. The possibility to use DC microgrid in a mine production area is analyzed in this study. The steady-state calculations are done to choose the suitable DC voltage level, cable type and power level of converters. After that, the dynamic calculations are done by using simulation model to analyze the stability of the system. Based on the calculations, energy storage is added to the grid and the optimal location of the energy storage is analyzed.

	Differential flatness for smooth transition between grid-connected and standalone mode of three-phase inverter By Abdelhakim SAIM	[View] [Download]
Abstract: In this paper, the use of flatness based control to achieve smooth transition between Grid Connected (GC) and Stand-Alone (SA) is investigated. The idea is to exploit the flatness proprieties to ensure smooth transition between GC and SA modes. The flatness control uses planned flat outputs to calculate the inverter controls that achieve disturbances rejection. The design of the proposed control is detailed and its effectiveness is evaluated.

	The Energy Ring to supply the Expoelectric'18 show with Renewable Energy Sources and Electric Vehicles By Cristian CHILLÓN-ANTON	[View] [Download]
Abstract: The Expoelectric fair takes place every year in Barcelona (Spain) and is devoted to Renewable energy and Electric Mobility. Street trade shows and fairs usually use Diesel generators to provide energy to fair booths because the street infrastructure is not designed to supply these events. In the case of Expoelectric and its objectives, the organization has proposed to supply the fair booths with on-site renewable energy and the use of exposed electrical vehicles to provide storage, which makes excellent sense in this kind of events.This paper aims to show this experience and detail the system developed for this objective. The result is the development of a power electronics-based system able to generate the grid where other resources and storage elements are connected. This paper details the system but also the control and operation algorithms to operate the microgrid without any type of communication between all the elements connected to them.During the two days of the fair, the Energy Ring microgrid delivered energy to the booths, assuring the supply and power quality needed for all the equipment connected (lighting, freezers, EV chargers, and computers).