Design and loss analysis of a high speed flywheel energy storage system based on axial-flux flywheel-rotor electric machines

Zhang, C.; Tseng, King Jet; Nguyen, Tho Duc; Zhang, S.

doi:10.1109/ipecon.2010.5697091

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…This compensation eliminates the effect of delay time by estimating the output of the controlled object G(s) after the lapse of delay time. The characteristic equation is given by (6). Therefore, the control performance can be improved from this equation.…”

Section: Power Control Methods With Smith Predictormentioning

confidence: 99%

“…Additionally, the kinetic energy which stored in the flywheel is proportional to the square of the rotational speed. For this reason, ultra high speed rotation using magnetic bearings have been studied in order to achieve high energy density [1][2][3][4][5][6]. The magnetic bearing to hold the rotating shaft without mechanical contact has been studied.…”

Section: Introductionmentioning

confidence: 99%

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Power control method using time delay compensation scheme based on Smith predictor for flywheel power leveling system

Tanaka

Itoh

Matsuo

et al. 2013

2013 IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS)

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This paper introduces the performance of a power leveling system with a 3.0-MJ, 9500-r/min flywheel energy storage. In term of the cost reduction, this system uses low cost flywheel and the general purpose products. Therefore, the time delay of the measurement device limits the control performance. In order to overcome this problem, the time delay compensation scheme based on Smith predictor is applied in the control in order to improve the control performance of the power regeneration. As a result, the overshoot of the regeneration power is eliminated by applying the compensation. In addition, the effectiveness of the power leveling control in a prototype is evaluated by experiment. As a result, it is confirmed that the power fluctuation is reduced by 84.6 %.

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Section: Power Control Methods With Smith Predictormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power control method using time delay compensation scheme based on Smith predictor for flywheel power leveling system

Tanaka

Itoh

Matsuo

et al. 2013

2013 IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS)

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show abstract

“…An analytical loss model of a novel outer rotor FESS validated based on measurements is presented in [12]. The design and analysis of the losses in a high-speed flywheel system are discussed in [13]. The former calculates the mechanical loss of the FESS while the latter studies the friction loss, core loss and the copper loss of the designed flywheel system, however, both papers ignore the losses due to windage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Standby Losses and Charging Cycles in Flywheel Energy Storage Systems

Amiryar

Pullen

2020

Energies

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Aerodynamic drag and bearing friction are the main sources of standby losses in the flywheel rotor part of a flywheel energy storage system (FESS). Although these losses are typically small in a well-designed system, the energy losses can become significant due to the continuous operation of the flywheel over time. For aerodynamic drag, commonly known as windage, there is scarcity of information available for loss estimation since most of the publications do not cover the partial vacuum conditions as required in the design of low loss energy storage flywheels. These conditions cause the flow regime to fall between continuum and molecular flow. Bearings may be of mechanical or magnetic type and in this paper the former is considered, typically hybridized with a passive magnetic thrust bearing. Mechanical bearing loss calculations have been extensively addressed in the open literature, including technical information from manufacturers but this has not previously been presented clearly and simply with reference to this application. The purpose of this paper is therefore to provide a loss assessment methodology for flywheel windage losses and bearing friction losses using the latest available information. An assessment of windage losses based on various flow regimes is presented with two different methods for calculation of windage losses in FESS under rarefied vacuum conditions discussed and compared. The findings of the research show that both methods closely correlate with each other for vacuum conditions typically required for flywheels. The effect of the air gap between the flywheel rotor and containment is also considered and justified for both calculation methods. Estimation of the bearing losses and considerations for selection of a low maintenance, soft mounted, bearing system is also discussed and analysed for a flywheel of realistic dimensions. The effect of the number of charging cycles on the relative importance of flywheel standby losses has also been investigated and the system total losses and efficiency have been calculated accordingly.

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“…A high-speed flywheel design and analyses of the losses of a flywheel were presented in [12]. Magnetic bearing was proposed to reduce the mechanical losses and it was reported that windage losses can be neglected if vacuum housing is used.…”

Section: Introductionmentioning

confidence: 99%

Sizing design and implementation of a flywheel energy storage system for space applications

Aydin¹,

Aydemir²

2016

Turk J Elec Eng & Comp Sci

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Flywheel energy storage systems have become an important research subject in recent years. They are also considered for space applications instead of hazardous and bulky electrochemical batteries. In this paper, a flywheel energy storage system has been designed for satellite attitude control systems. Power requirements of a small commercial satellite have been used as the starting point of the design. The designed system includes a BLDC motor. The machine is run as a motor for 60 min and the stored energy is discharged during the following 30 min to simulate low orbit satellite operation. Experimental results show that these systems can be used in space applications.

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Design and loss analysis of a high speed flywheel energy storage system based on axial-flux flywheel-rotor electric machines

Cited by 17 publications

References 10 publications

Power control method using time delay compensation scheme based on Smith predictor for flywheel power leveling system

Power control method using time delay compensation scheme based on Smith predictor for flywheel power leveling system

Analysis of Standby Losses and Charging Cycles in Flywheel Energy Storage Systems

Sizing design and implementation of a flywheel energy storage system for space applications

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