EPE Association: EPE 2016 - DS3h: Micro-grids

EPE 2016 - DS3h: Micro-grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 06: Grids and Smart Grids > EPE 2016 - DS3h: Micro-grids

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   A Hybrid AC/DC Microgrid Control Scheme With Voltage-Source Inverter-Controlled Interlinking Converters
By Fei LUO [View]
[Download]

Abstract: This paper proposes a fully decentralized control scheme for hybrid AC/DC microgrids. It proportionallyshares the loads in a hybrid AC/DC microgrid among its sub-grids. By controlling the interlinkingconverters as voltage source inverters, the scheme enables the hybrid microgrid to operate with or withoutAC sources. It is possible to shut down all the power sources in the AC sub-grid to minimize the fuelconsumption. Moreover, any fault in the AC sources will not cause the collapse of the entire AC sub-grid.Consequently, the hybrid microgrid under the control scheme can have higher efficiency, reliability andflexibility as compared to the existing decentralized schemes.

   Battery Energy Storage Effect on AC/DC Microgrids Efficiency
By Elahe DOROUDCHI [View]
[Download]

Abstract: This paper compares the efficiency of AC and DC microgrids from a new perspective. It studies the effect of adding a battery energy storage on a microgrid efficiency. A new designed Finnish townhouse building is applied to model the power flow and converter types. Losses related to wirings, converters and dis/charging of the energy storage are calculated in a minute resolution to enhance the accuracy of the results. Ultimately, efficiency is derived for a range of converters' switching frequencies from 4 to 15 kHz while considering the microgrid possible voltage fluctuations in both AC and DC systems. Results represent higher efficiency in the DC microgrid in both cases with and without the existence of the storage. Furthermore, less discrepancy is obtained in the DC microgrid efficiency when the storage is added comparing to the AC microgrid. Accordingly, switching to DC distribution inside the building concerning the fast developments in power conversion devices seems promising in increasing the efficiency of the power systems.

   DC Micro-grid Power Coordination Based on Fuzzy Logic Control
By Rashid ALBADWAWI [View]
[Download]

Abstract: The power coordination in DC microgrids has a vital role in enhancing the performance and management of multi generation units. Renewable Energy Sources (RES) are limited to their available power with intermittent nature. Battery-based energy storage sources have limitations in the charging and discharging capabilities to avoid depleting the battery and preserve the State of Charge (SOC) within its satisfactory limits. The battery balances the power difference between RES and loads. However, in severe cases where the SOC is very low, load shedding is crucial. In this paper, a Fuzzy Logic Controller (FLC) has been proposed to coordinate the power flow of PV unit and battery to satisfy the load by full use of the available PV power. It controls the PV's output power and keeps the SOC and charging / discharging power of the battery within their required margins regardless of the variations in load. Furthermore, load shedding of low priority load has been implemented when the battery couldn't balance the microgrid power flow. Simplicity in managing multi input-multi output system by FLC is the main merit. Matlab/Simulink results are presented to validate the performance of the proposed controller.

   Distributed Coordination of Electric Vehicle Charging in a Community Microgrid Considering Real Time Price
By CHENDAN LI [View]
[Download]

Abstract: The predictable increasing adoption of EV by residential users imposes the necessity of ElectricVehicle charging coordination, in order to charge effectively while minimizing the impact on the grid.In this paper, a two-stage distributed coordination algorithm for electric vehicle charging managementin a community microgrid is proposed. Each local EV charging controller is taken as an agent, whichcan manage the charging to achieve the optimization of the whole community by communicating in asparse network. The proposed algorithm aims at optimizing real-time, which manages the chargingactivity based on the real-time price, while meeting the requirement of technical constraints of thedistribution system.

   Local Grid Load Coordination for Load-Shiftable Domestic Appliances in a Variable-Tariff Environment
By Karl Stephan STILLE [View]
[Download]

Abstract: Some domestic appliances can shift their load by a least-cost optimization in a variable-tariff environment.As decisions of all appliances are highly correlated, high load peak arise.With the presented coordination in an optimization hierarchy, load peak is significantly lowered by load distribution in time.

   Multi-Agent System for Day-Ahead Energy Management of Microgrid
By Elvira AMICARELLI [View]
[Download]

Abstract: The decentralization of control and management in electrical grid is an important evolution to integrate distributed generation into the power grids ensuring power reliability, quality and safety. Microgrids and Multi-Agent Systems are considered the key to apply this evolution. This paper presents a Multi-Agent System architecture (developed in JADE) for Microgrid operation. Furthermore, a rule-based algorithm for day-ahead energy management of Microgrid considering dynamic market prices is presented.

   Multipurpose emulation platform for research in microgrids
By TOMAS LLEDO-PONSATI [View]
[Download]

Abstract: This paper proposes the outline design of a platform that can be used to implement multiple emulatorsto replicate the behaviour of different energetic resources, storage systems, loads or electric grids. Thisplatform can be used to test control algorithms of microgrids with different elements connected into it.

   Power Management for Self-Powered SiC Based AC Smart-Breaker for Nano-grid Applications
By Masafumi OTSUKA [View]
[Download]

Abstract: This work targets a novel self-powered Smart Circuit Breaker (SCB) for monitoring and controlling power inemerging small-scale AC nano-grids. The SCB concept is intended as a direct replacement of standard(120 Vac, 15 Arms) household circuit breakers, which imposes several challenging constraints. The SCB must therefore generate its own internal supply from the small AC voltage drop across the main switch when the breaker is closed. The SCB is composed of the following key blocks: 1) back-to-back 900 V Silicon Carbide (SiC) MOSFETs as the main power switches, 2) a low-voltage energy harvesting circuit, 3) a high-voltage step-down converter, and 4) low-power digital controller and wireless communication circuits. In order to stabilize the internal supply voltage under a wide range of AC load currents, a novel approach of dynamic on-resistance control is implemented, through adaptive gate-drive and MOSFET segmentation. The fabricated SCB prototype dissipates only 7.4 W for a 13 Arms AC load, corresponding to an efficiency of 99.5\%.

   Research on Circulating Current Reduction of Droop-Controlled Parallel Inverters
By MIng'ao LIU [View]
[Download]

Abstract: The technology of inverters parallel connection has become a new research hotspot. In this paper, a modified droop control strategy, cooperated with virtual impedance technology, has been presented in order to suppress circulating current. Simulation and experiment of two three-phase inverters proved this theory.

   Smart Power Management of DC Microgrids in Future Milligrids
By SAEED PEYGHAMI-AKHULEH [View]
[Download]

Abstract: In this paper a novel droop approach for power management in low voltage dc MicroGrids (MGs) based on a master-slave concept is presented. A virtual frequency is injected by a master unit, which is proportional to its output power. Other slave units determine their output power according to the corresponding frequency based droop characteristics. Unlike the dc voltage-droop methods, the proposed virtual frequency-droop approach can be smartly applied for proportional power management among the energy units and loads as well as adding zero net energy capability to the MG. Both power flow and energy flow can be performed without utilizing an extra communication system. Simulation results validate the effectiveness of the proposed scheme.

EPE 2016 - DS3h: Micro-grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 06: Grids and Smart Grids > EPE 2016 - DS3h: Micro-grids
	[return to parent folder]

	A Hybrid AC/DC Microgrid Control Scheme With Voltage-Source Inverter-Controlled Interlinking Converters By Fei LUO	[View] [Download]
Abstract: This paper proposes a fully decentralized control scheme for hybrid AC/DC microgrids. It proportionallyshares the loads in a hybrid AC/DC microgrid among its sub-grids. By controlling the interlinkingconverters as voltage source inverters, the scheme enables the hybrid microgrid to operate with or withoutAC sources. It is possible to shut down all the power sources in the AC sub-grid to minimize the fuelconsumption. Moreover, any fault in the AC sources will not cause the collapse of the entire AC sub-grid.Consequently, the hybrid microgrid under the control scheme can have higher efficiency, reliability andflexibility as compared to the existing decentralized schemes.

	Battery Energy Storage Effect on AC/DC Microgrids Efficiency By Elahe DOROUDCHI	[View] [Download]
Abstract: This paper compares the efficiency of AC and DC microgrids from a new perspective. It studies the effect of adding a battery energy storage on a microgrid efficiency. A new designed Finnish townhouse building is applied to model the power flow and converter types. Losses related to wirings, converters and dis/charging of the energy storage are calculated in a minute resolution to enhance the accuracy of the results. Ultimately, efficiency is derived for a range of converters' switching frequencies from 4 to 15 kHz while considering the microgrid possible voltage fluctuations in both AC and DC systems. Results represent higher efficiency in the DC microgrid in both cases with and without the existence of the storage. Furthermore, less discrepancy is obtained in the DC microgrid efficiency when the storage is added comparing to the AC microgrid. Accordingly, switching to DC distribution inside the building concerning the fast developments in power conversion devices seems promising in increasing the efficiency of the power systems.

	DC Micro-grid Power Coordination Based on Fuzzy Logic Control By Rashid ALBADWAWI	[View] [Download]
Abstract: The power coordination in DC microgrids has a vital role in enhancing the performance and management of multi generation units. Renewable Energy Sources (RES) are limited to their available power with intermittent nature. Battery-based energy storage sources have limitations in the charging and discharging capabilities to avoid depleting the battery and preserve the State of Charge (SOC) within its satisfactory limits. The battery balances the power difference between RES and loads. However, in severe cases where the SOC is very low, load shedding is crucial. In this paper, a Fuzzy Logic Controller (FLC) has been proposed to coordinate the power flow of PV unit and battery to satisfy the load by full use of the available PV power. It controls the PV's output power and keeps the SOC and charging / discharging power of the battery within their required margins regardless of the variations in load. Furthermore, load shedding of low priority load has been implemented when the battery couldn't balance the microgrid power flow. Simplicity in managing multi input-multi output system by FLC is the main merit. Matlab/Simulink results are presented to validate the performance of the proposed controller.

	Distributed Coordination of Electric Vehicle Charging in a Community Microgrid Considering Real Time Price By CHENDAN LI	[View] [Download]
Abstract: The predictable increasing adoption of EV by residential users imposes the necessity of ElectricVehicle charging coordination, in order to charge effectively while minimizing the impact on the grid.In this paper, a two-stage distributed coordination algorithm for electric vehicle charging managementin a community microgrid is proposed. Each local EV charging controller is taken as an agent, whichcan manage the charging to achieve the optimization of the whole community by communicating in asparse network. The proposed algorithm aims at optimizing real-time, which manages the chargingactivity based on the real-time price, while meeting the requirement of technical constraints of thedistribution system.

	Local Grid Load Coordination for Load-Shiftable Domestic Appliances in a Variable-Tariff Environment By Karl Stephan STILLE	[View] [Download]
Abstract: Some domestic appliances can shift their load by a least-cost optimization in a variable-tariff environment.As decisions of all appliances are highly correlated, high load peak arise.With the presented coordination in an optimization hierarchy, load peak is significantly lowered by load distribution in time.

	Multi-Agent System for Day-Ahead Energy Management of Microgrid By Elvira AMICARELLI	[View] [Download]
Abstract: The decentralization of control and management in electrical grid is an important evolution to integrate distributed generation into the power grids ensuring power reliability, quality and safety. Microgrids and Multi-Agent Systems are considered the key to apply this evolution. This paper presents a Multi-Agent System architecture (developed in JADE) for Microgrid operation. Furthermore, a rule-based algorithm for day-ahead energy management of Microgrid considering dynamic market prices is presented.

	Multipurpose emulation platform for research in microgrids By TOMAS LLEDO-PONSATI	[View] [Download]
Abstract: This paper proposes the outline design of a platform that can be used to implement multiple emulatorsto replicate the behaviour of different energetic resources, storage systems, loads or electric grids. Thisplatform can be used to test control algorithms of microgrids with different elements connected into it.

	Power Management for Self-Powered SiC Based AC Smart-Breaker for Nano-grid Applications By Masafumi OTSUKA	[View] [Download]
Abstract: This work targets a novel self-powered Smart Circuit Breaker (SCB) for monitoring and controlling power inemerging small-scale AC nano-grids. The SCB concept is intended as a direct replacement of standard(120 Vac, 15 Arms) household circuit breakers, which imposes several challenging constraints. The SCB must therefore generate its own internal supply from the small AC voltage drop across the main switch when the breaker is closed. The SCB is composed of the following key blocks: 1) back-to-back 900 V Silicon Carbide (SiC) MOSFETs as the main power switches, 2) a low-voltage energy harvesting circuit, 3) a high-voltage step-down converter, and 4) low-power digital controller and wireless communication circuits. In order to stabilize the internal supply voltage under a wide range of AC load currents, a novel approach of dynamic on-resistance control is implemented, through adaptive gate-drive and MOSFET segmentation. The fabricated SCB prototype dissipates only 7.4 W for a 13 Arms AC load, corresponding to an efficiency of 99.5\%.

	Research on Circulating Current Reduction of Droop-Controlled Parallel Inverters By MIng'ao LIU	[View] [Download]
Abstract: The technology of inverters parallel connection has become a new research hotspot. In this paper, a modified droop control strategy, cooperated with virtual impedance technology, has been presented in order to suppress circulating current. Simulation and experiment of two three-phase inverters proved this theory.

	Smart Power Management of DC Microgrids in Future Milligrids By SAEED PEYGHAMI-AKHULEH	[View] [Download]
Abstract: In this paper a novel droop approach for power management in low voltage dc MicroGrids (MGs) based on a master-slave concept is presented. A virtual frequency is injected by a master unit, which is proportional to its output power. Other slave units determine their output power according to the corresponding frequency based droop characteristics. Unlike the dc voltage-droop methods, the proposed virtual frequency-droop approach can be smartly applied for proportional power management among the energy units and loads as well as adding zero net energy capability to the MG. Both power flow and energy flow can be performed without utilizing an extra communication system. Simulation results validate the effectiveness of the proposed scheme.