EPE Association: EPE 2017 - DS1j: Other renewable Energy Systems and Storage Systems

EPE 2017 - DS1j: Other renewable Energy Systems and Storage Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - DS1j: Other renewable Energy Systems and Storage Systems

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   Calendar Ageing of LiFePO4/C Batteries in the Second Life Applications
By Maciej SWIERCZYNSKI [View]
[Download]

Abstract: Lithium-ion battery second life usage might be an interesting solution for certain applications and it can bring not only environmental benefits but also e.g. lower electric vehicles or hybrid electric vehicles total cost of ownership. However, the electrical performance and performance degradation of the battery systems in the second life application are still unknown what brings significant economic risk and hinders second life battery usage.This work investigates the capacity and power degradation of the 2.5Ah nanophosphate LiFePO4/C cells under different the second life calendar ageing regimes.

   Considering the Power Quality in the Power-Hardware-in-Loop simulation of the water electrolyzers
By Vesa RUUSKANEN [View]
[Download]

Abstract: Considering the effect of current and voltage frequency content in the power-hardware-in-loop (PHIL) simulation of water electrolyzers is studied as the AC components may cause additional losses in the electrolyzer stack. A transistor based power supply is used to excite DC current with selected AC components for an alkaline electrolyzer and a PHIL simulator. The practical current and voltage waveforms are analyzed, and the possibilities to take the power quality aspects in consideration in the PHIL simulation is discussed.

   Design and implementation of low-loss non-inverting buck-boost for lithium-ion batteries charging applications
By Federico RODIGHIERO [View]
[Download]

Abstract: This article is going to describe the design and implementation of a non-inverting buck-boost converter for lithium-ion battery chargers. The described modulation strategy allows to achieve a high efficiency and high power density converter. The prototype is made up of off-the-shelf components and the elab- orated current predictive control algorithm avoids the use of a current sensor. Only voltage sensing is needed. Both the designed strategy for the prototype and the implementation of the control algorithm on MCU are described. Experimental measurements on device prove the capabilities of the prototype.

   Design of a PM-Generator for a Straight Flow Counter-Rotating Micro-Hydro Turbine
By Domenico VIOLANTE [View]
[Download]

Abstract: This paper presents the design and the measurement of two identical PM-generators driven by an axial counter-rotating micro-turbine, called DuoTurbo-microturbine. This prototype for drinking water networks has been jointly developed by the HES-SO Valais//Wallis, the EPFL-Laboratory for Hydraulic Machines and industrial partners. The modular in-line 'plug & play' technology requires low investment, reaching economic feasibility with an available power between 5 kW and 25 kW. One stage of the microturbine consists of two axial counter-rotating runners that form a compact independent unit. Each runner of the turbine holds its own rim generator, the DuoTurbo-configuration involving that each hydraulic runner is integral with each electrical rotor [1].

   Design of Current Controller with Circulation Current Reduction for Parallel Three Phase Voltage Inverter
By Kiryong KIM [View]
[Download]

Abstract: A circulating current is a major problem introduced by directly connecting voltage source inverter (VSI)in parallel. This circulating current occurs as a zero-sequence current between the inverters by specicswitch states. Its alternatives were presented by hardware and software methods in many papers. Whencoupled inductor (CI) are employed for the high frequency circulating current, a circulating current controlleris required to avoid the saturation of the CIs by the low frequency circulating current. In thischapter, the zero sequence circulating current (ZSCC) and its alternatives are investigated by the hardwareand mathematical descriptions. A high performance circulating current controller is proposed byapplying are repetitive controller (RC) to the zero-sequence current control loop. The proposed controllercan effectively minimize the low frequency circulating current without any data sharing betweenthe inverters in unfavorable conditions. Furthermore, this can be applicable to modular congurations ofparallel three-phase VSIs. The performance of the proposed controller is veried by the simulations andexperiments.

   Effect of Sudden Variation of Grid Voltage in Primary Frequency Control Application Using Converter Based Energy Storage Systems for Weak Grid Systems
By NILANJAN MUKHERJEE [View]
[Download]

Abstract: One of the main revenue streams of the power system industries is provide a stable frequency all the time.Energy storage systems are well suited for the purpose because of their bidirectional capabilities. Recently converter based energy storage system has been gaining interests for providing frequency responsereplacing traditional generator based solutions due to the speed of the power electronic converters. One of the emerging problems has been how to control the converter or ride-through when there is a fault or sudden variation in grid voltage and what could be the possible impact on frequency. This paper analyses the effect of variation of grid voltage on the frequency control through the dynamics of the phase locked loop. The paper brings in a unique issue arises in frequency control structure especially under sudden grid voltage variation/fault conditions. It has been found that the frequency may undergo some unwanted oscillations during fault duration and the converter may be unstable. The detailed analysis of the frequency control stability issue under weak grid scenario is presented followed by a brief solution of the problem is discussed through comprehensive simulation studies.

   Interleaved Three-Port Boost Converter for Photovoltaic Systems Including Storage
By Ander GONZÁLEZ [View]
[Download]

Abstract: In this manuscript a new interleaved topology based on the three-port boost converter is presented. A new modulation scheme that works for the interleaved and non-interleaved 3-port boost converters is proposed as well.Models for interleaved and non-interleaved converters that describe the behavior in any of the different working modes are developed. These models can be easily averaged in order to obtain system dynamic response omitting the switching behavior. Simulations of the converters in different working points are shown together with the explanations of the advantages and drawbacks of the topology. Experimental results are included for some of the cases that exhibit low current ripple.

   Performance evaluations of load balancing in industrial power grids using vehicle to grid technology
By Sebastian RAAB [View]
[Download]

Abstract: The presented paper evaluates measurement results and reports about further development from the vehicleto grid system presented in [1] and [12]. It uses a number of mass-production electric vehicles in sinkand source mode to balance the load of an industrial plant by cutting off its peak loads. The actual loadis detected and the balancing power is calculated by a predictive algorithm which keeps the total load belowthe setpoint. Analysis show that the goal of peak load shaving is reached using the presented controlstrategy. Although mean availability of balancing performance is lower than assumed. Improvementswere made, reducing DC link ripple current by passively low pass filtering. After evaluating proportionof stations' active to passive times, a standby mode was implemented improving efficiency of overallsystem.

   Stalling Phenomenon Prevention using Artificial Neural Network Based Strategy for Oscillation Water Column Coupled to Wells Turbine
By Salwa YOUSRY [View]
[Download]

Abstract: In this paper, an Artificial Neural Network ANN based algorithm is proposed for energy conversionsystem adapting Oscillating Water Column (OWC) coupled to a Wells turbine. The presented algorithmintegrates with the associated P-Q controlled grid connected Doubly Fed Induction Generator (DFIG)by calculating the optimized turbine speed that grantees stalling phenomenon avoidance.The proposedtechnique effectiveness has been attested by simulating various operation conditions featuring differentinput differential pressure levels. The presented technique offers simplified tuned algorithm in additionto fast transient response with minimal oscillation during steady state operation.

EPE 2017 - DS1j: Other renewable Energy Systems and Storage Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - DS1j: Other renewable Energy Systems and Storage Systems
	[return to parent folder]

	Calendar Ageing of LiFePO4/C Batteries in the Second Life Applications By Maciej SWIERCZYNSKI	[View] [Download]
Abstract: Lithium-ion battery second life usage might be an interesting solution for certain applications and it can bring not only environmental benefits but also e.g. lower electric vehicles or hybrid electric vehicles total cost of ownership. However, the electrical performance and performance degradation of the battery systems in the second life application are still unknown what brings significant economic risk and hinders second life battery usage.This work investigates the capacity and power degradation of the 2.5Ah nanophosphate LiFePO4/C cells under different the second life calendar ageing regimes.

	Considering the Power Quality in the Power-Hardware-in-Loop simulation of the water electrolyzers By Vesa RUUSKANEN	[View] [Download]
Abstract: Considering the effect of current and voltage frequency content in the power-hardware-in-loop (PHIL) simulation of water electrolyzers is studied as the AC components may cause additional losses in the electrolyzer stack. A transistor based power supply is used to excite DC current with selected AC components for an alkaline electrolyzer and a PHIL simulator. The practical current and voltage waveforms are analyzed, and the possibilities to take the power quality aspects in consideration in the PHIL simulation is discussed.

	Design and implementation of low-loss non-inverting buck-boost for lithium-ion batteries charging applications By Federico RODIGHIERO	[View] [Download]
Abstract: This article is going to describe the design and implementation of a non-inverting buck-boost converter for lithium-ion battery chargers. The described modulation strategy allows to achieve a high efficiency and high power density converter. The prototype is made up of off-the-shelf components and the elab- orated current predictive control algorithm avoids the use of a current sensor. Only voltage sensing is needed. Both the designed strategy for the prototype and the implementation of the control algorithm on MCU are described. Experimental measurements on device prove the capabilities of the prototype.

	Design of a PM-Generator for a Straight Flow Counter-Rotating Micro-Hydro Turbine By Domenico VIOLANTE	[View] [Download]
Abstract: This paper presents the design and the measurement of two identical PM-generators driven by an axial counter-rotating micro-turbine, called DuoTurbo-microturbine. This prototype for drinking water networks has been jointly developed by the HES-SO Valais//Wallis, the EPFL-Laboratory for Hydraulic Machines and industrial partners. The modular in-line 'plug & play' technology requires low investment, reaching economic feasibility with an available power between 5 kW and 25 kW. One stage of the microturbine consists of two axial counter-rotating runners that form a compact independent unit. Each runner of the turbine holds its own rim generator, the DuoTurbo-configuration involving that each hydraulic runner is integral with each electrical rotor [1].

	Design of Current Controller with Circulation Current Reduction for Parallel Three Phase Voltage Inverter By Kiryong KIM	[View] [Download]
Abstract: A circulating current is a major problem introduced by directly connecting voltage source inverter (VSI)in parallel. This circulating current occurs as a zero-sequence current between the inverters by specicswitch states. Its alternatives were presented by hardware and software methods in many papers. Whencoupled inductor (CI) are employed for the high frequency circulating current, a circulating current controlleris required to avoid the saturation of the CIs by the low frequency circulating current. In thischapter, the zero sequence circulating current (ZSCC) and its alternatives are investigated by the hardwareand mathematical descriptions. A high performance circulating current controller is proposed byapplying are repetitive controller (RC) to the zero-sequence current control loop. The proposed controllercan effectively minimize the low frequency circulating current without any data sharing betweenthe inverters in unfavorable conditions. Furthermore, this can be applicable to modular congurations ofparallel three-phase VSIs. The performance of the proposed controller is veried by the simulations andexperiments.

	Effect of Sudden Variation of Grid Voltage in Primary Frequency Control Application Using Converter Based Energy Storage Systems for Weak Grid Systems By NILANJAN MUKHERJEE	[View] [Download]
Abstract: One of the main revenue streams of the power system industries is provide a stable frequency all the time.Energy storage systems are well suited for the purpose because of their bidirectional capabilities. Recently converter based energy storage system has been gaining interests for providing frequency responsereplacing traditional generator based solutions due to the speed of the power electronic converters. One of the emerging problems has been how to control the converter or ride-through when there is a fault or sudden variation in grid voltage and what could be the possible impact on frequency. This paper analyses the effect of variation of grid voltage on the frequency control through the dynamics of the phase locked loop. The paper brings in a unique issue arises in frequency control structure especially under sudden grid voltage variation/fault conditions. It has been found that the frequency may undergo some unwanted oscillations during fault duration and the converter may be unstable. The detailed analysis of the frequency control stability issue under weak grid scenario is presented followed by a brief solution of the problem is discussed through comprehensive simulation studies.

	Interleaved Three-Port Boost Converter for Photovoltaic Systems Including Storage By Ander GONZÁLEZ	[View] [Download]
Abstract: In this manuscript a new interleaved topology based on the three-port boost converter is presented. A new modulation scheme that works for the interleaved and non-interleaved 3-port boost converters is proposed as well.Models for interleaved and non-interleaved converters that describe the behavior in any of the different working modes are developed. These models can be easily averaged in order to obtain system dynamic response omitting the switching behavior. Simulations of the converters in different working points are shown together with the explanations of the advantages and drawbacks of the topology. Experimental results are included for some of the cases that exhibit low current ripple.

	Performance evaluations of load balancing in industrial power grids using vehicle to grid technology By Sebastian RAAB	[View] [Download]
Abstract: The presented paper evaluates measurement results and reports about further development from the vehicleto grid system presented in [1] and [12]. It uses a number of mass-production electric vehicles in sinkand source mode to balance the load of an industrial plant by cutting off its peak loads. The actual loadis detected and the balancing power is calculated by a predictive algorithm which keeps the total load belowthe setpoint. Analysis show that the goal of peak load shaving is reached using the presented controlstrategy. Although mean availability of balancing performance is lower than assumed. Improvementswere made, reducing DC link ripple current by passively low pass filtering. After evaluating proportionof stations' active to passive times, a standby mode was implemented improving efficiency of overallsystem.

	Stalling Phenomenon Prevention using Artificial Neural Network Based Strategy for Oscillation Water Column Coupled to Wells Turbine By Salwa YOUSRY	[View] [Download]
Abstract: In this paper, an Artificial Neural Network ANN based algorithm is proposed for energy conversionsystem adapting Oscillating Water Column (OWC) coupled to a Wells turbine. The presented algorithmintegrates with the associated P-Q controlled grid connected Doubly Fed Induction Generator (DFIG)by calculating the optimized turbine speed that grantees stalling phenomenon avoidance.The proposedtechnique effectiveness has been attested by simulating various operation conditions featuring differentinput differential pressure levels. The presented technique offers simplified tuned algorithm in additionto fast transient response with minimal oscillation during steady state operation.