High voltage stator for a flywheel energy storage system

Aanstoos, T.A.; Kajs, J.P.; Brinkman, W.G.; Liu, H.P.; Ouroua, A.; Hayes, Richard; Hearn, C.S.; Sarjeant, J.; Gill, H.

doi:10.1109/20.911830

Cited by 31 publications

(9 citation statements)

References 2 publications

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“…두 번째 시스템은 95% 이상의 높은 효율과 충· 방전 시간의 고 신뢰성, 긴 수명 및 낮은 유지보수비를 가지는 초전도 저장 (Superconducting Magnetic Energy Storage : SMES) 시스템이다 [5] . 그러나 생산성의 한계, 번째는 플라이훨 에너지 저장 시스템(Flywheel Energy Storage System)이다 [6], [7] . 이 시스템은 짧은 방전 시간 과 짧은 시간 내에서 높은 전력 밀도를 가지므로 장기 간 에너지를 저장해야하는 도시철도 변전설비에는 적합 하지 못하다.…”

Section: 서 론unclassified

A Study on the Compensation Method for Unbalance Parallel Operation of Parallel Connected Thyristor Dual Converters using Circulating Current

Kim¹,

Han²,

Moon³

et al. 2016

The Transactions of the Korean Institute of Power Electronics

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This study proposes a performance improvement for parallel-connected thyristor dual converters using a circulating current with an unbalanced parallel operation compensator. The proposed control method determines a variable reference value for the voltage PI controller according to voltage error at firing angle control applied to a difference current control. This method uses circulating current control to maintain a stable voltage and excellent current response during parallel operation. The effectiveness of the proposed control is verified with a simulation and an experiment based on the comparison of the performance of the proposed control method with other conventional methods.

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Section: 서 론unclassified

A Study on the Compensation Method for Unbalance Parallel Operation of Parallel Connected Thyristor Dual Converters using Circulating Current

Kim¹,

Han²,

Moon³

et al. 2016

The Transactions of the Korean Institute of Power Electronics

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“…This flywheel could store 2 kWh and was rated for 150 kW of continuous power [41,42]. They reported a flywheel for pulsed loads in a military vehicle in 2001 [43]. Another study presented the use of a small flywheel buffer for a fuel cell bus [44].…”

Section: Busesmentioning

confidence: 99%

Flywheel Energy Storage for Automotive Applications

et al. 2015

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A review of flywheel energy storage technology was made, with a special focus on the progress in automotive applications. We found that there are at least 26 university research groups and 27 companies contributing to flywheel technology development. Flywheels are seen to excel in high-power applications, placing them closer in functionality to supercapacitors than to batteries. Examples of flywheels optimized for vehicular applications were found with a specific power of 5.5 kW/kg and a specific energy of 3.5 Wh/kg. Another flywheel system had 3.15 kW/kg and 6.4 Wh/kg, which can be compared to a state-of-the-art supercapacitor vehicular system with 1.7 kW/kg and 2.3 Wh/kg, respectively. Flywheel energy storage is reaching maturity, with 500 flywheel power buffer systems being deployed for London buses (resulting in fuel savings of over 20%), 400 flywheels in operation for grid frequency regulation and many hundreds more installed for uninterruptible power supply (UPS) applications. The industry estimates the mass-production cost of a specific consumer-car flywheel system to be 2000 USD. For regular cars, this system has been shown to save 35% fuel in the U.S. Federal Test Procedure (FTP) drive cycle.

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“…During Flywheel Assisted Acceleration (T C <0) (8) (9) Given the inclusion of these torques, the equilibrium for the transmission should comply with (10) Therefore, the torque at the sun and ring should be calculated with the inclusion of the mechanical efficiency as presented below.…”

Section: 2mentioning

confidence: 99%

“…The answer was the use of a highspeed flywheel. The use of flywheels in hybrid vehicles has been proposed by a number of authors [10][11][12][13], but typically this involves the use of a motor generator to transmit power to and from the flywheel. This type of system carries a substantial efficiency penalty, due to the mechanical-electricalmechanical energy conversion required.…”

Section: Introductionmentioning

confidence: 99%

The mechanical hybrid vehicle: An investigation of a flywheel-based vehicular regenerative energy capture system

Diego‐Ayala

Martinez-Gonzalez

McGlashan

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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The mechanical hybrid vehicle: an investigation of a flywheel-based vehicular regenerative energy capture system. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 222(11), pp. 2087-2101. doi: 10.1243 This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract: Capturing braking energy by regeneration into an on board energy storage unit, offers the potential to reduce significantly the fuel consumption of vehicles. A common technique is to generate electricity in the motors of a hybrid electric vehicle when braking, and use this to charge an on board electrochemical battery. However, such batteries are costly, bulky and generally not amenable to fast charging as this affects battery life and capacity. In order to overcome these problems, a mechanical energy storage system capable of accepting and delivering surges of power is proposed and investigated. A scale physical model of the system, based around a flywheel, a planetary gear set and a brake, was built and operated in a laboratory. Tests showed that the proposed system could be used to store and provide braking energy between a flywheel and a vehicle, the latter emulated by an air-drag dynamometer. This validated the operating principle of the system and its computational model. Further, a computational analysis of a full size vehicle incorporating the mechanical energy storage system was conducted. The results showed that the utilisation of this system in a vehicle, when compared to a conventional vehicle, led to reductions in emissions and fuel consumption. PermanentKeywords: regenerative braking, braking energy, hybrid vehicle, planetary gear set, epicyclic, flywheel.

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High voltage stator for a flywheel energy storage system

Cited by 31 publications

References 2 publications

A Study on the Compensation Method for Unbalance Parallel Operation of Parallel Connected Thyristor Dual Converters using Circulating Current

A Study on the Compensation Method for Unbalance Parallel Operation of Parallel Connected Thyristor Dual Converters using Circulating Current

Flywheel Energy Storage for Automotive Applications

The mechanical hybrid vehicle: An investigation of a flywheel-based vehicular regenerative energy capture system

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