EPE Association: EPE 2019 - DS3g: Other Renewable Energy Systems, Energy Harvesting; Energy Storage

EPE 2019 - DS3g: Other Renewable Energy Systems, Energy Harvesting; Energy Storage
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 05: Renewable Energy Power Systems > EPE 2019 - DS3g: Other Renewable Energy Systems, Energy Harvesting; Energy Storage

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   A Novel Intermittent Energy Capturing Method and Performance Analysis of Electromagnetic Energy Harvester for a Tire Application
By Hanju CHA [View]
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Abstract: In this paper, a power conversion system for an energy harvester of electromagnetic generator for a tire application is proposed, and the energy harvesting system is experimentally verified. The power conversion system with the proposed energy capturing method consists of a full-bridge rectifier, a boost converter and a lithium-ion battery, and is designed to weigh less than 3g with a size of 25mm by 14mm due to a restricted installation inside a tire. In this power conversion system, a novel intermittent energy transfer method is proposed so as to charge the battery with minimal losses, which can be occurred in the power conversion. Since power of the energy harvester is very small, performance is analyzed to find the optimal parameters through of simulation and experiment.

   A novel model-based approach for the energy management of distributed storage systems in utility-scale PV fields
By Giovanni NOBILE [View]
[Download]

Abstract: The integration of energy storage systems (ESS) in PV plants is a very topical subject. In recent years, many research activities have been addressed to PV plants combined with batteries. Most of the papers in literature refer to plants for residential or industrial users with significant self-consumptions. Only a few papers investigate on ESS for utility-scale PV plants and on the optimal energy management strategies, some examples are in [1], [2]. As a contribution to fill this gap, this paper presents a study on a specific power layout in which the ESS is distributed into the PV field and no longer centralized close to the inverter cabin, as for the majority of the existent PV plants with ESS. Focus is on the design and implementation of suitable models for both the PV field and the ESS with the purpose to establish optimal energy management strategies. The validation process of such models has been carried out through laboratory tests as well as exploiting data coming from the monitoring system of a real PV plant in Central Italy.

   A Novel Topology and Control System for Interconnected Wave Energy Converters (IWECs)
By Mauricio ESPINOZA [View]
[Download]

Abstract: Recently, the extraction of energy from the incoming waves has taken more importance in the energy generation based on renewable resources. However, most of the attention has been directed towards the Power-Take-Off systems more than in the interaction between several generating units. Consequently, in this work, there are presented and carefully analysed a novel topology of Interconnected Wave-Energy Converters (IWECs) and its associated control system. A representative set of data of a real wave frequency and height variation from the South Uist island, in Scotland, and a proof-of-concept simulation show that the energy requirements of the proposed IWEC are lower than those required for individual WECs.

   An Experimental Analysis of Boost-type Current-improving Passive Rectifier for Vibration Generators with LC Resonance
By Masataka MINAMI [View]
[Download]

Abstract: Energy-harvesting system has attracted increased attention. One of the energy sources for energy harvesting system is mechanical vibration. This research investigates the improvement in the output power from the vibration generator by using all passive devices. This report numerically and experimentally verifies the validity of the proposed circuit.

   Capacitance Requirements in Three-Phase MMCs for LV Systems: Review of Different Minimization Approaches
By Tarek YOUNIS [View]
[Download]

Abstract: This paper presents a review for different techniques of low frequency capacitor voltage ripple reduction for low voltage five-level Modular Multilevel Converters (MMCs). This study is performed on two MMC topologies: a conventional MMC topology, and a modified reduced capacitance MMC topology. Two possible control techniques have been discussed and compared with numeric simulation results in terms of capacitor voltage ripple, inductor peak current, switch peak and rms current. These control techniques are: circulating current injection and third harmonic voltage injection. This paper focuses mainly on the amount of capacitor voltage ripple reduction attained by each technique. Simulation results are obtained from 10-kW, 400V, 50 Hz three-phase five-level MMC.

   Digital Control of Energy Storage Based Virtual Synchronous Generator
By Yaoqin JIA [View]
[Download]

Abstract: Digital control of the virtual synchronous generator contributes to improve the stability of the system. The discrete-time model of voltage source inverter with LC filter is analyzed and implemented in this paper. Then this paper designs the VSG control parameters in the discrete domain, considering a digital control method of seamless transformation without PLL. The experimental results verify the effectiveness of the proposed method.

   Energy Storage System for Programmable Dispatch of Photovoltaic Generation
By Luiz H. MENEGHETTI [View]
[Download]

Abstract: This paper proposes a structure to compensate for the intermittency of photovoltaic (PV) generation,allowing a programmable dispatch for small generators. The proposed system is based on the integration of a lithium-ion battery bank with a power inverter connected to the AC grid. This integration is made possible using a high voltage gain bidirectional DC-DC converter. With this, the system is able to provide a constant power flow to the grid. To validate the proposed system, real-time HIL (hardware-in-the-loop) simulation with real data of solar irradiance are used.

   GCC Power Production Management Enabling PCC Voltages Control
By Ivan TODOROVIC [View]
[Download]

Abstract: The grid-connected converter control has different objectives that must be achieved, sometimes simultaneously. In recent years, particularly important became those associated with irregular working regimes. In this paper, active and reactive power production strategies with an objective of balanced PCC voltages recovery during unbalanced grid voltage sags are proposed, taking into account current limits. The PCC voltages regulation scheme is seamlessly integrated with regular GCC power production functions. The number of required input parameters for scheme to function is reduced, as only a limited knowledge of the system to which the GCC is connected is necessary. Selected HIL results verify the effectiveness of the proposed algorithm.

   Implementing a power source to study the effect of power quality on the PEM water electrolyzer stack
By Lauri JÄRVINEN [View]
[Download]

Abstract: A power supply unit is implemented to experimentally study the effect of power quality on the water electrolyzer specific energy consumption. The power supply unit consists of a tailored signal generator and a laboratory DC power source used as an amplifier. The unit is capable of emulating the operation of thyristor bridge rectifiers.

   Modelling of Stochastically Dependent Forecast Errors for Load Flow Simulations in the Transmission Grid Using Convolution
By Annika KLETTKE [View]
[Download]

Abstract: The increasing share of renewable infeed results in a more volatile infeed situation. Especially in the grid security assessment, for example in transmission grid operational planning, the prognosis of the infeed from renewable energy systems becomes highly relevant. Uncertainties of this prognosis and possible dependencies have to be taken into account to ensure a stable system operation. Monte Carlo simulation is a common approach used for probabilistic load flow simulation. Due to the long computation time, this article proposes a probabilistic load flow approach using convolution to consider these uncertainties in simulations for large-scale transmission grids. Computation time plays an important role when uncertainties and their effects like cascading failures are to be considered. The methodology is validated using a comparison to deterministic approaches but has to be improved in dealing with correlations. In general, the methodology shows a good performance in simulating cascades.

   Robust supervisory approach for a variable speed micro-hydropower operating as a backup source
By Lakhdar BELHADJI [View]
[Download]

Abstract: Micro hydropower coupled to the variable speed technology represents a good solution in terms ofcost and environmental impact in the new context of electricity merchandizing and regulations.As the primary resource is continuous and predictable, these systems can be used as a backup sourceto insure continuous supply for sensitive charges. This paper describes a robust, fast and soft transitionapproach between grid connected mode (PQ) and islanding mode (Vf), while ensuring a power supplywith a voltage and frequency that meet the requirements of loads and standards

   Stability of a Power Electronics Based Microgrid System
By Mohammad Ashifur RAHMAN [View]
[Download]

Abstract: With the view to have zero CO2 emission from power system, it is expected to shift power generation to renewable energy sources (solar, wind etc.) from traditional fossil fuel (coal, oil, gas etc. ) based power generation. When large scale generation is shifted towards renewable sources, the uncertainty of the sources is a barrier for stable operation. Under uncertainty, it is necessary to analyze the behavior of the grid to be able to shift to renewable based future electricity generations with stable operation. In this paper, a microgrid is modeled in time domain simulation of MATLAB/SIMULINK. Then the stability of the grid is analyzed for different cases with uncertainties.

EPE 2019 - DS3g: Other Renewable Energy Systems, Energy Harvesting; Energy Storage
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 05: Renewable Energy Power Systems > EPE 2019 - DS3g: Other Renewable Energy Systems, Energy Harvesting; Energy Storage
	[return to parent folder]

	A Novel Intermittent Energy Capturing Method and Performance Analysis of Electromagnetic Energy Harvester for a Tire Application By Hanju CHA	[View] [Download]
Abstract: In this paper, a power conversion system for an energy harvester of electromagnetic generator for a tire application is proposed, and the energy harvesting system is experimentally verified. The power conversion system with the proposed energy capturing method consists of a full-bridge rectifier, a boost converter and a lithium-ion battery, and is designed to weigh less than 3g with a size of 25mm by 14mm due to a restricted installation inside a tire. In this power conversion system, a novel intermittent energy transfer method is proposed so as to charge the battery with minimal losses, which can be occurred in the power conversion. Since power of the energy harvester is very small, performance is analyzed to find the optimal parameters through of simulation and experiment.

	A novel model-based approach for the energy management of distributed storage systems in utility-scale PV fields By Giovanni NOBILE	[View] [Download]
Abstract: The integration of energy storage systems (ESS) in PV plants is a very topical subject. In recent years, many research activities have been addressed to PV plants combined with batteries. Most of the papers in literature refer to plants for residential or industrial users with significant self-consumptions. Only a few papers investigate on ESS for utility-scale PV plants and on the optimal energy management strategies, some examples are in [1], [2]. As a contribution to fill this gap, this paper presents a study on a specific power layout in which the ESS is distributed into the PV field and no longer centralized close to the inverter cabin, as for the majority of the existent PV plants with ESS. Focus is on the design and implementation of suitable models for both the PV field and the ESS with the purpose to establish optimal energy management strategies. The validation process of such models has been carried out through laboratory tests as well as exploiting data coming from the monitoring system of a real PV plant in Central Italy.

	A Novel Topology and Control System for Interconnected Wave Energy Converters (IWECs) By Mauricio ESPINOZA	[View] [Download]
Abstract: Recently, the extraction of energy from the incoming waves has taken more importance in the energy generation based on renewable resources. However, most of the attention has been directed towards the Power-Take-Off systems more than in the interaction between several generating units. Consequently, in this work, there are presented and carefully analysed a novel topology of Interconnected Wave-Energy Converters (IWECs) and its associated control system. A representative set of data of a real wave frequency and height variation from the South Uist island, in Scotland, and a proof-of-concept simulation show that the energy requirements of the proposed IWEC are lower than those required for individual WECs.

	An Experimental Analysis of Boost-type Current-improving Passive Rectifier for Vibration Generators with LC Resonance By Masataka MINAMI	[View] [Download]
Abstract: Energy-harvesting system has attracted increased attention. One of the energy sources for energy harvesting system is mechanical vibration. This research investigates the improvement in the output power from the vibration generator by using all passive devices. This report numerically and experimentally verifies the validity of the proposed circuit.

	Capacitance Requirements in Three-Phase MMCs for LV Systems: Review of Different Minimization Approaches By Tarek YOUNIS	[View] [Download]
Abstract: This paper presents a review for different techniques of low frequency capacitor voltage ripple reduction for low voltage five-level Modular Multilevel Converters (MMCs). This study is performed on two MMC topologies: a conventional MMC topology, and a modified reduced capacitance MMC topology. Two possible control techniques have been discussed and compared with numeric simulation results in terms of capacitor voltage ripple, inductor peak current, switch peak and rms current. These control techniques are: circulating current injection and third harmonic voltage injection. This paper focuses mainly on the amount of capacitor voltage ripple reduction attained by each technique. Simulation results are obtained from 10-kW, 400V, 50 Hz three-phase five-level MMC.

	Digital Control of Energy Storage Based Virtual Synchronous Generator By Yaoqin JIA	[View] [Download]
Abstract: Digital control of the virtual synchronous generator contributes to improve the stability of the system. The discrete-time model of voltage source inverter with LC filter is analyzed and implemented in this paper. Then this paper designs the VSG control parameters in the discrete domain, considering a digital control method of seamless transformation without PLL. The experimental results verify the effectiveness of the proposed method.

	Energy Storage System for Programmable Dispatch of Photovoltaic Generation By Luiz H. MENEGHETTI	[View] [Download]
Abstract: This paper proposes a structure to compensate for the intermittency of photovoltaic (PV) generation,allowing a programmable dispatch for small generators. The proposed system is based on the integration of a lithium-ion battery bank with a power inverter connected to the AC grid. This integration is made possible using a high voltage gain bidirectional DC-DC converter. With this, the system is able to provide a constant power flow to the grid. To validate the proposed system, real-time HIL (hardware-in-the-loop) simulation with real data of solar irradiance are used.

	GCC Power Production Management Enabling PCC Voltages Control By Ivan TODOROVIC	[View] [Download]
Abstract: The grid-connected converter control has different objectives that must be achieved, sometimes simultaneously. In recent years, particularly important became those associated with irregular working regimes. In this paper, active and reactive power production strategies with an objective of balanced PCC voltages recovery during unbalanced grid voltage sags are proposed, taking into account current limits. The PCC voltages regulation scheme is seamlessly integrated with regular GCC power production functions. The number of required input parameters for scheme to function is reduced, as only a limited knowledge of the system to which the GCC is connected is necessary. Selected HIL results verify the effectiveness of the proposed algorithm.

	Implementing a power source to study the effect of power quality on the PEM water electrolyzer stack By Lauri JÄRVINEN	[View] [Download]
Abstract: A power supply unit is implemented to experimentally study the effect of power quality on the water electrolyzer specific energy consumption. The power supply unit consists of a tailored signal generator and a laboratory DC power source used as an amplifier. The unit is capable of emulating the operation of thyristor bridge rectifiers.

	Modelling of Stochastically Dependent Forecast Errors for Load Flow Simulations in the Transmission Grid Using Convolution By Annika KLETTKE	[View] [Download]
Abstract: The increasing share of renewable infeed results in a more volatile infeed situation. Especially in the grid security assessment, for example in transmission grid operational planning, the prognosis of the infeed from renewable energy systems becomes highly relevant. Uncertainties of this prognosis and possible dependencies have to be taken into account to ensure a stable system operation. Monte Carlo simulation is a common approach used for probabilistic load flow simulation. Due to the long computation time, this article proposes a probabilistic load flow approach using convolution to consider these uncertainties in simulations for large-scale transmission grids. Computation time plays an important role when uncertainties and their effects like cascading failures are to be considered. The methodology is validated using a comparison to deterministic approaches but has to be improved in dealing with correlations. In general, the methodology shows a good performance in simulating cascades.

	Robust supervisory approach for a variable speed micro-hydropower operating as a backup source By Lakhdar BELHADJI	[View] [Download]
Abstract: Micro hydropower coupled to the variable speed technology represents a good solution in terms ofcost and environmental impact in the new context of electricity merchandizing and regulations.As the primary resource is continuous and predictable, these systems can be used as a backup sourceto insure continuous supply for sensitive charges. This paper describes a robust, fast and soft transitionapproach between grid connected mode (PQ) and islanding mode (Vf), while ensuring a power supplywith a voltage and frequency that meet the requirements of loads and standards

	Stability of a Power Electronics Based Microgrid System By Mohammad Ashifur RAHMAN	[View] [Download]
Abstract: With the view to have zero CO2 emission from power system, it is expected to shift power generation to renewable energy sources (solar, wind etc.) from traditional fossil fuel (coal, oil, gas etc. ) based power generation. When large scale generation is shifted towards renewable sources, the uncertainty of the sources is a barrier for stable operation. Under uncertainty, it is necessary to analyze the behavior of the grid to be able to shift to renewable based future electricity generations with stable operation. In this paper, a microgrid is modeled in time domain simulation of MATLAB/SIMULINK. Then the stability of the grid is analyzed for different cases with uncertainties.