EPE Association: EPE 2021 - Microgrids and HIL Simulators

EPE 2021 - Microgrids and HIL Simulators
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 07: Power Supplies > EPE 2021 - Microgrids and HIL Simulators

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   Control and Fault Monitoring of Modular Dual Active Bridge Converters
By Samar AIDRUS [View]
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Abstract: Modular DC-DC converters are a promising solution for many applications due to their flexible adaption to various voltage and power levels. However, this modularization involves an increased control effort to achieve symmetrical voltage and current distribution among the converter modules. In this work, a threephase modular Dual Active Bridge (DAB3) converter is considered, wherein the individual converters are connected in input-series-output-parallel (ISOP) configuration. In order to address the problems of unequal power distribution among the modules, a new control strategy with uniform input-voltage distribution is proposed and verified using real-time simulation. Furthermore, the fault ride-through (FRT) capability of two ISOP connected DAB3 converters is simulated for a short circuit DC fault at the output. Finally, a novel pulse pattern generator (PPG), executed in VHDL, is used to verify the modulation strategy employed for FRT.

   Fuzzy control-based energy management system for interconnected residential microgrids using the forecasts of power generation and load demand
By Diego ARCOS AVILES [View]
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Abstract: The continuous growth of residential rooftop photovoltaic systems carries with it the problem of the penetration of renewable energy in the utility network, which can lead to its saturation. For thisreason, the efficient use of the generated renewable power is of great interest today. This paper presents an energy management system design based on fuzzy logic control to perform the powerexchange between two neighboring interconnected residential grid-connected microgrids to reduce the power supply by the mains. Each of the microgrids comprises rooftop photovoltaic generation and energy storage systems. The proposed strategy uses generation and demand forecasts for powersharing from the microgrid with excess energy to the energy deficit microgrid. Simulation results show the improved performance of the proposed energy management compared to each microgrid's behavior when they do not share power.

   Model predictive control-based energy management system for isolated electro-thermal microgrids in rural areas of Ecuador
By Antonio SALAZAR [View]
[Download]

Abstract: The electricity demand in the world is increasing rapidly, so technological advances have focused on developing systems that can supply energy in a safe, reliable, and environmentally friendly way. Likewise, the access to electricity of isolated communities in developing countries plays a fundamental role in improving the quality of life of their inhabitants. In this context, Microgrids become potential alternatives to provide electricity to locations in Ecuador where the National Interconnected System does not reach. In this work, an Energy Management System (EMS) for an isolated MG based on Model Predictive Control is developed with the aim to minimize the MG operating costs, reliably and safely electricity supply while satisfying the users' comfort requirements in an isolated rural area of Ecuador. The electro-thermal MG considered is composed of a photovoltaic generator, a diesel generator, a lead-acid battery bank, electrical loads, and a Domestic Hot Water system consisting of an Electric Water Heater and a water storage tank. Simulations are carried out using weather data obtained through Solcast API for the year 2020. The performance of the proposed EMS is compared to a Unit Commitment standard, showing a reduction in MG operating costs and in the greenhouse gas emissions while maximizing the utilization of renewable energy.

   Small-Signal Stability Analysis of Synthetic Inertia-Based Photovoltaic Generators
By Edris POURESMAEIL [View]
[Download]

Abstract: Frequency stability is a consequential issue in power systems dominated by inverter - based generators. To mitigate potential frequency stability problems, inertia emulation concept must be employed in the control of interfaced inverters. This study presents the small - signal state - space realization of a double - stage photovoltaic (PV) generator augmented with synthetic inertia emulator (SIE). The inertia power is provided by the inverter dc - link ultracapacitor. Synchronization of the generator with the host grid is performed using a fast but accurate frequency - locked loop (FLL). The impact of synthetic inertia loop and FLL bandwidth on the PV generator stability is scrutinized as the main contribution. The accuracy of theoretical studies and proper operation of the PV generator are examined through simulations in MATLAB / Simulink.

EPE 2021 - Microgrids and HIL Simulators
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 07: Power Supplies > EPE 2021 - Microgrids and HIL Simulators
	[return to parent folder]

	Control and Fault Monitoring of Modular Dual Active Bridge Converters By Samar AIDRUS	[View] [Download]
Abstract: Modular DC-DC converters are a promising solution for many applications due to their flexible adaption to various voltage and power levels. However, this modularization involves an increased control effort to achieve symmetrical voltage and current distribution among the converter modules. In this work, a threephase modular Dual Active Bridge (DAB3) converter is considered, wherein the individual converters are connected in input-series-output-parallel (ISOP) configuration. In order to address the problems of unequal power distribution among the modules, a new control strategy with uniform input-voltage distribution is proposed and verified using real-time simulation. Furthermore, the fault ride-through (FRT) capability of two ISOP connected DAB3 converters is simulated for a short circuit DC fault at the output. Finally, a novel pulse pattern generator (PPG), executed in VHDL, is used to verify the modulation strategy employed for FRT.

	Fuzzy control-based energy management system for interconnected residential microgrids using the forecasts of power generation and load demand By Diego ARCOS AVILES	[View] [Download]
Abstract: The continuous growth of residential rooftop photovoltaic systems carries with it the problem of the penetration of renewable energy in the utility network, which can lead to its saturation. For thisreason, the efficient use of the generated renewable power is of great interest today. This paper presents an energy management system design based on fuzzy logic control to perform the powerexchange between two neighboring interconnected residential grid-connected microgrids to reduce the power supply by the mains. Each of the microgrids comprises rooftop photovoltaic generation and energy storage systems. The proposed strategy uses generation and demand forecasts for powersharing from the microgrid with excess energy to the energy deficit microgrid. Simulation results show the improved performance of the proposed energy management compared to each microgrid's behavior when they do not share power.

	Model predictive control-based energy management system for isolated electro-thermal microgrids in rural areas of Ecuador By Antonio SALAZAR	[View] [Download]
Abstract: The electricity demand in the world is increasing rapidly, so technological advances have focused on developing systems that can supply energy in a safe, reliable, and environmentally friendly way. Likewise, the access to electricity of isolated communities in developing countries plays a fundamental role in improving the quality of life of their inhabitants. In this context, Microgrids become potential alternatives to provide electricity to locations in Ecuador where the National Interconnected System does not reach. In this work, an Energy Management System (EMS) for an isolated MG based on Model Predictive Control is developed with the aim to minimize the MG operating costs, reliably and safely electricity supply while satisfying the users' comfort requirements in an isolated rural area of Ecuador. The electro-thermal MG considered is composed of a photovoltaic generator, a diesel generator, a lead-acid battery bank, electrical loads, and a Domestic Hot Water system consisting of an Electric Water Heater and a water storage tank. Simulations are carried out using weather data obtained through Solcast API for the year 2020. The performance of the proposed EMS is compared to a Unit Commitment standard, showing a reduction in MG operating costs and in the greenhouse gas emissions while maximizing the utilization of renewable energy.

	Small-Signal Stability Analysis of Synthetic Inertia-Based Photovoltaic Generators By Edris POURESMAEIL	[View] [Download]
Abstract: Frequency stability is a consequential issue in power systems dominated by inverter - based generators. To mitigate potential frequency stability problems, inertia emulation concept must be employed in the control of interfaced inverters. This study presents the small - signal state - space realization of a double - stage photovoltaic (PV) generator augmented with synthetic inertia emulator (SIE). The inertia power is provided by the inverter dc - link ultracapacitor. Synchronization of the generator with the host grid is performed using a fast but accurate frequency - locked loop (FLL). The impact of synthetic inertia loop and FLL bandwidth on the PV generator stability is scrutinized as the main contribution. The accuracy of theoretical studies and proper operation of the PV generator are examined through simulations in MATLAB / Simulink.