EPE Association: EPE 2018 - DS3i: Micro-Grids

EPE 2018 - DS3i: Micro-Grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2018 - DS3i: Micro-Grids

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   Active Damping of Torsional Vibrations due to the Sub-harmonic Instability on a Synchronous Generator
By Saeed PEYGHAMI [View]
[Download]

Abstract: Sub-harmonic stability issues due to the interaction between a load-commutated motor drive and a synchronous turbo-generator train in a Liquefied Natural Gas (LNG) station are studied in this paper. The sub-harmonic current injected by motor drives may excite the mechanical torsional modes of turbo-generator train. In this paper, the electro-mechanical interaction phenomenon is investigated and an active damper is proposed to absorb the sub-harmonic currents of motor drives and increase the damping of the electro-mechanical system. Simulations and experiments validate the instability problem and effectiveness of the proposed solution.

   Analytical design and modelling of power converters equipped with synthetic inertia control
By Alberto BOLZONI [View]
[Download]

Abstract: This paper deals with a design strategy for the provision of fast-response synthetic inertia services fromelectronic converters interfaced to the grid by means of a constant power control structure, like the onetraditionally adopted for renewables generators. The novelty introduced lies in the inclusion of theexternal grid characteristics in the definition of the current-controlled inertia loop; this analyticalapproach allows to predict the properties of the power network and converter dynamics during inertiaprovision.

   Bidirectional Operation of the Power Electronic Interface for Nearly Zero Energy Buildings
By Indrek ROASTO [View]
[Download]

Abstract: Nearly-zero energy buildings (NZEB) are buildings with extremely efficient energy usage and localenergy generation capability. By the definition, the annual net energy consumption of NZEB should bezero, which can be achieved via a flexible energy management system (EMS). This paper proposes anEMS based on a bidirectional power electronic interface (PEI). The proposed PEI can have a variety offunctions at the PCC, e.g., ancillary services, load DSM, on/off-grid operation mode, power qualitycontrol. As a result, the NZEB transforms into a hierarchically controlled nanogrid, which forms a smallindependent building block of the future microgrid. Synchronous and asynchronous operations of theNZEB were studied and the bidirectional energy flow control is demonstrated. The functionality andcontrol strategies of the proposed PEI were verified by the computer simulations.

   Model Predictive Voltage Control applied to a Nested NPC to micro-grid applications
By Margarita NORAMBUENA [View]
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Abstract: Microgrids are subsystems of the distribution grid operating as a single controllable system either connected or isolated from the grid. In this paper the frequency and voltage regulation loops are coordinated by a non-linear Model Predictive Control (MPC) controller, and the controllable resources aresequentially dispatched, the proposes a Model Predictive Voltage Control is applied to a 4-level Nested Neutral Point Clamped converter. The performance of the proposed converter is verified by simulations.

   Modeling of Islanded Microgrids Using Static and Dynamic Equivalent Thevenin Circuits
By Mobin NADERI [View]
[Download]

Abstract: In this paper, a new modeling method based on the equivalent Thevenin circuit is proposed for inverterinterfaced microgrids. The proposed method approximates the entire network connected to eachinverter with an equivalent Thevenin circuit. The equivalent circuit is studied in two forms: staticimpedance and dynamic second-order RL branch. The static impedance equivalent circuit provides agood steady state but not a good transient response. To cope with this issue, the static impedance isreplaced with a dynamic second-order RL branch, which results in appropriate transients. Both staticand dynamic models are validated using a microgrid test system simulated inMATLAB/SimPowerSystems.

   Modelling and Experimental Set-up of an Microgrid based on Photovoltaic Car Parks
By Emilien DUVERGER [View]
[Download]

Abstract: The development of microgrids improves the effective integration of Distributed Generation (DG),especially Renewable Energy Sources (RES). Due to the intermittency of electricity production fromrenewable energies such as solar or wind, Energy Storage System (ESS) is important to achieve higherflexibility and reliability of network. The massive development of smart grid should take intoconsideration the following issues such as modeling, monitoring and management. This paper presentsthe microgrid modelling which is used to manage it optimally. This microgrid consists of distributedgeneration, storage system, loads, communication and control system. The proposed microgridmanagement strategies to minimize operating cost are based on a Dynamic Programming (DP)algorithm. They are implemented with a load control scheduling for controllable loads such as theElectric Vehicle (EV) charging. The developed DP algorithm generates a two-days microgrid controlscheduling to optimize an objective function. The control parameters are the battery power and theactivation of the controllable loads considering their constraints. In the first part, we detail ourexperimental microgrid named 'Rivesaltes-Grid'. In the second part, we focus on the models of themicrogrid components: PV array, Lithium Battery, Electric Vehicle and Loads. In the third part, wepresent our first management strategies based on DP. Finally, we conclude and present the futureperspectives.

   Parallel Operation of Dual VSCs Regulated by FCS-MPC Using Droop Control Approach
By Mohammed ALHASHEEM [View]
[Download]

Abstract: This paper introduces an improvement in the coordination of two different voltage source converters(VSCs) controlled by the improved finite control set model predictive control (FCS-MPC). It investigates the transient performance of both converters and the alleviation of the circulating power in caseof different output impedances. In order to ensure proper load sharing, a suitable coordination is applied and utilizing droop control. Simulation and experimental results validate the better performanceof the proposed improved FCS-MPC and its appropriate droop characteristics to enable proper paralleloperation.

EPE 2018 - DS3i: Micro-Grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2018 - DS3i: Micro-Grids
	[return to parent folder]

	Active Damping of Torsional Vibrations due to the Sub-harmonic Instability on a Synchronous Generator By Saeed PEYGHAMI	[View] [Download]
Abstract: Sub-harmonic stability issues due to the interaction between a load-commutated motor drive and a synchronous turbo-generator train in a Liquefied Natural Gas (LNG) station are studied in this paper. The sub-harmonic current injected by motor drives may excite the mechanical torsional modes of turbo-generator train. In this paper, the electro-mechanical interaction phenomenon is investigated and an active damper is proposed to absorb the sub-harmonic currents of motor drives and increase the damping of the electro-mechanical system. Simulations and experiments validate the instability problem and effectiveness of the proposed solution.

	Analytical design and modelling of power converters equipped with synthetic inertia control By Alberto BOLZONI	[View] [Download]
Abstract: This paper deals with a design strategy for the provision of fast-response synthetic inertia services fromelectronic converters interfaced to the grid by means of a constant power control structure, like the onetraditionally adopted for renewables generators. The novelty introduced lies in the inclusion of theexternal grid characteristics in the definition of the current-controlled inertia loop; this analyticalapproach allows to predict the properties of the power network and converter dynamics during inertiaprovision.

	Bidirectional Operation of the Power Electronic Interface for Nearly Zero Energy Buildings By Indrek ROASTO	[View] [Download]
Abstract: Nearly-zero energy buildings (NZEB) are buildings with extremely efficient energy usage and localenergy generation capability. By the definition, the annual net energy consumption of NZEB should bezero, which can be achieved via a flexible energy management system (EMS). This paper proposes anEMS based on a bidirectional power electronic interface (PEI). The proposed PEI can have a variety offunctions at the PCC, e.g., ancillary services, load DSM, on/off-grid operation mode, power qualitycontrol. As a result, the NZEB transforms into a hierarchically controlled nanogrid, which forms a smallindependent building block of the future microgrid. Synchronous and asynchronous operations of theNZEB were studied and the bidirectional energy flow control is demonstrated. The functionality andcontrol strategies of the proposed PEI were verified by the computer simulations.

	Model Predictive Voltage Control applied to a Nested NPC to micro-grid applications By Margarita NORAMBUENA	[View] [Download]
Abstract: Microgrids are subsystems of the distribution grid operating as a single controllable system either connected or isolated from the grid. In this paper the frequency and voltage regulation loops are coordinated by a non-linear Model Predictive Control (MPC) controller, and the controllable resources aresequentially dispatched, the proposes a Model Predictive Voltage Control is applied to a 4-level Nested Neutral Point Clamped converter. The performance of the proposed converter is verified by simulations.

	Modeling of Islanded Microgrids Using Static and Dynamic Equivalent Thevenin Circuits By Mobin NADERI	[View] [Download]
Abstract: In this paper, a new modeling method based on the equivalent Thevenin circuit is proposed for inverterinterfaced microgrids. The proposed method approximates the entire network connected to eachinverter with an equivalent Thevenin circuit. The equivalent circuit is studied in two forms: staticimpedance and dynamic second-order RL branch. The static impedance equivalent circuit provides agood steady state but not a good transient response. To cope with this issue, the static impedance isreplaced with a dynamic second-order RL branch, which results in appropriate transients. Both staticand dynamic models are validated using a microgrid test system simulated inMATLAB/SimPowerSystems.

	Modelling and Experimental Set-up of an Microgrid based on Photovoltaic Car Parks By Emilien DUVERGER	[View] [Download]
Abstract: The development of microgrids improves the effective integration of Distributed Generation (DG),especially Renewable Energy Sources (RES). Due to the intermittency of electricity production fromrenewable energies such as solar or wind, Energy Storage System (ESS) is important to achieve higherflexibility and reliability of network. The massive development of smart grid should take intoconsideration the following issues such as modeling, monitoring and management. This paper presentsthe microgrid modelling which is used to manage it optimally. This microgrid consists of distributedgeneration, storage system, loads, communication and control system. The proposed microgridmanagement strategies to minimize operating cost are based on a Dynamic Programming (DP)algorithm. They are implemented with a load control scheduling for controllable loads such as theElectric Vehicle (EV) charging. The developed DP algorithm generates a two-days microgrid controlscheduling to optimize an objective function. The control parameters are the battery power and theactivation of the controllable loads considering their constraints. In the first part, we detail ourexperimental microgrid named 'Rivesaltes-Grid'. In the second part, we focus on the models of themicrogrid components: PV array, Lithium Battery, Electric Vehicle and Loads. In the third part, wepresent our first management strategies based on DP. Finally, we conclude and present the futureperspectives.

	Parallel Operation of Dual VSCs Regulated by FCS-MPC Using Droop Control Approach By Mohammed ALHASHEEM	[View] [Download]
Abstract: This paper introduces an improvement in the coordination of two different voltage source converters(VSCs) controlled by the improved finite control set model predictive control (FCS-MPC). It investigates the transient performance of both converters and the alleviation of the circulating power in caseof different output impedances. In order to ensure proper load sharing, a suitable coordination is applied and utilizing droop control. Simulation and experimental results validate the better performanceof the proposed improved FCS-MPC and its appropriate droop characteristics to enable proper paralleloperation.