• Title/Summary/Keyword: Flywheel energy storage system

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Design of Micro Flywheel Energy Storage System (초소형 플라이휠 에너지 저장장치의 설계)

  • Yi, Ji-Eun;Yoo, Seong-Yeol;Noh, Myoung-Gyu
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.879-884
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    • 2007
  • Flywheel energy storage systems have advantages over other types of energy storage devices in such aspects as unlimited charge/discharge cycles and environmental friendliness. In this paper we propose a millimeter scale flywheel energy storage device. The flywheel is supported by a pair of passive magnetic bearings and rotated by a toroidally wound electric motor/generator. The geometry of the bearings is optimized for the maximum dynamic performance.

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Development of Flywheel Energy Storage System (플라이휠에 의한 에너지 저장 장치 개발)

  • Kim, W.H.;Kim, J.S.;Rim, G.H.
    • Proceedings of the KIEE Conference
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    • 1997.07f
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    • pp.1924-1926
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    • 1997
  • With the development of power electronics, many new energy storage systems such as the superconducting magnetic energy storage, the flywheel energy storage, and the capacitive energy storage, etc. are being intensively studied recently in order to replace battery in some special applications, Among these innovative energy storage systems, the flywheel system exhibits some unique features such as high power density, easy maintenance and longer lifetime. This paper introduces the novel flywheel energy storage system. Operation and features of the system are illustrated and verified on a 6kVA, 20kHz IPM based experimental circuit for O/A application. The Halbach Array Motor is selected of the design of the three phase motor/generator for the flywheel energy storage system.

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Designing for the Off-line UPS using SMB Flywheel Energy Storage System (초고속 플라이휠 에너지 저장시스템을 이용한 Off-line UPS 제작)

  • 최재호
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.689-692
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    • 2000
  • This paper presents a designing for the Off-line UPS usig SMB Flywheel Energy Storage System. This described flywheel energy storage system is designed to replace of the conventional EMB(Electro Mechanical Battery) system. To realize the high efficiency and to minimize the torque ripple the waveform of the inverter output current is controlled to be sinusoidal. The actual performance of the Off-line UPS using flywheel energy storage system is described. The prototype device was manufactured, The experimental result has good characteristics at a time of power transition region and regeneration modes,

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Design and Construction of 10 kWh Class Flywheel Energy Storage System (10 kWh급 플라이휠 에너지 저장 시스템 설계 및 제작)

  • Jung, S.Y.;Han, S.C.;Han, Y.H.;Park, B.J.;Bae, Y.C.;Lee, W.R.
    • Progress in Superconductivity
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    • v.13 no.1
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    • pp.40-46
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    • 2011
  • A superconductor flywheel energy storage system (SFES) is an electro-mechanical battery which transforms electrical energy into mechanical energy for storage, and vice versa. A 10 kWh class flywheel energy storage system (FESS) has been developed to evaluate the feasibility of a 35 kWh class SFES with a flywheel $I_p/I_t$ ratio larger than 1. The 10 kWh class FESS is composed of a main frame, a composite flywheel, active magnetic dampers (AMDs), a permanent magnet bearing, and a motor/generator. The flywheel of the FESS rotates at a very high speed to store energy, while being levitated by a permanent magnetic bearing and a pair of thrust AMDs. The 10 kWh class flywheel is mainly composed of a composite rotor assembly, where most of the energy is stored, two radial and two thrust AMD rotors, which dissipate vibration at critical speeds, a permanent magnet rotor, which supports most of the flywheel weight, a motor rotor, which spins the flywheel, and a central hollow shaft, where the parts are assembled and aligned to. The stators of each of the main components are assembled on to housings, which are assembled and aligned to the main frame. Many factors have been considered while designing each part of the flywheel, stator and frame. In this study, a 10 kWh class flywheel energy storage system has been designed and constructed for test operation.

A magnetic bearing capacity due to unbalance mass in a flywheel energy storage system (자기베어링을 이용한 플라이휠 에너지 저장 시스템의 불평형 질량에 의한 베어링의 동적 부하 용량)

  • Kim, Bong-Soo;Bae, Yong-Chae;Lee, Wook-Ryun;Kim, Hee-Soo;Lee, Doo-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.176-181
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    • 2009
  • In this article, excitation forces due to unbalance mass in a flywheel energy storage system will be discussed, which mainly consists of a composite flywheel and active magnetic bearings and a motor/generator. Unbalance mass causes moments as well as centrifugal forces to the center of the flywheel when the flywheel rotates. The moment excites the flywheel to revolve in the shape of conical revolution and in real operation, the flywheel shows an aspect that conical revolution is a main mode when system failure occurs. Although there are several excitation sources to the flywheel including unbalance mass, an excitation from motor and control issues of the magnetic bearings, we could infer unbalance mass is the main cause of the failure from a comparison between a composite flywheel and a steel flywheel in the same condition. In this of view, excitation forces and moments induced by unbalance mass should be carefully considered in dynamics of the flywheel so that the energy storage system can be operated in more stable conditions.

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Design and Construction of 35 kWh Class Superconductor Flywheel Energy Storage System Main Frame (35 kWh급 초전도 플라이휠 에너지 저장 시스템 프레임 설계 및 제작)

  • Jung, S.Y.;Han, Y.H.;Park, B.J.;Han, S.C.
    • Progress in Superconductivity
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    • v.13 no.1
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    • pp.52-57
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    • 2011
  • A superconductor flywheel energy storage system (SFES) is an electro-mechanical battery which transforms electrical energy into mechanical energy for storage, and vice versa. The 35 kWh class SFES is composed of a main frame, superconductor bearings, electro-magnetic dampers, a motor/generator, and a composite flywheel. The energy storing capacity of the SFES can be limited by the operational speed range of the system. The operational speed range is limited by many factors, especially the resonant frequency of the main frame and flywheel. In this study, a steel frame has been designed and constructed for a 35 kWh class SFES. All the main parts, their housings, and the flywheel are aligned and assembled on to the main frame. While in operation, the flywheel excites the main frame, as well as all the parts assembled to it, causing the system to vibrate at the rotating speed. If the main frame is excited at its resonant frequency, the system will resonate, which may lead to unstable levitation at the superconductor bearings and electro-magnetic dampers. The main frame for the 35 kWh class SFES has been designed and constructed to improve stiffness for the stable operation of the system within the operational speed range.

Analysis on Application of Flywheel Energy Storage System for offshore plants with Dynamic Positioning System

  • Jeong, Hyun-Woo;Kim, Yoon-Sik;Kim, Chul-Ho;Choi, Sung-Hwan;Yoon, Kyoung-Kuk
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.7
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    • pp.935-941
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    • 2012
  • This paper describes a study of conventional electrical rig and simulated application of Flywheel Energy Storage system on the power system of the offshore plants with dynamic positioning system with the following aims: improve fuel consumption on engines, prevent blackout and mitigate voltage sags due to pulsed load and fault. Fuel consumption has been analyzed for the generators of the typical drilling rigs compared with the power plant with Flywheel Storage Unit which has an important aid in avoiding power interruption during DP (Dynamic Positioning) operation. The FES (Fly wheel Energy storage System) releases energy very quickly and efficiently to ensure continuity of the power supply to essential consumers such as auxiliary machinery and thrusters upon main power failure. It will run until the standby diesel generator can start and supply the electric power to the facilities to keep the vessel in correct position under DP operation. The proposed backup method to utilize the quick and large energy storage Flywheel system can be optimized in any power system design on offshore plant.

Validation of Flexible Rotor Model for a Large Capacity Flywheel Energy Storage System (유한요소법을 이용한 대용량 플라이휠 에너지 저장 장치의 연성 회전체 모델의 검증)

  • Yoo, Seong-Yeol;Park, Cheol-Hoon;Choi, Sang-Kyu;Lee, Jeong-Pil;Noh, Myoung-Gyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.12
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    • pp.1096-1101
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    • 2008
  • When we design a controller for the active magnetic bearings that support a large rotor, it is important to have an accurate model of the rotor. For the case of the flywheel that is used to store energy, an accurate rotor model is especially important because the dynamics change with respect to the running speed due to gyroscopic effects. In this paper, we present a procedure of obtaining an accurate rotor model of a large flywheel energy storage system using finite-element method. The model can predict the first and the second bending mode which match well with the experimental results obtained from a prototype flywheel energy storage system.

Technical Survey of Highly Efficient Cargo Handling System (고효율 하역장비의 기술동향)

  • Park, Kyoung-Taik;Kim, Kyung-Han;Kim, Doo-Hyung;Cho, Gyu-Baek;Kim, Han-Me
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2010.04a
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    • pp.276-277
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    • 2010
  • This paper deals with energy storage system for saving the energy of RTGC(rubber tired gantry crane). Advantage and disadvantage of battery, super-capacitor, and flywheel as an energy storage system were surveyed. Even if a flywheel energy storage system includes some problems such as manufacturing technique and high price, it is surveyed with a promising energy storage system In addition, RTGCs using battery or flywheel as the energy storage system were quantitatively presented through a survey of literatures. It was found that the both RTGC with those systems can reduced the waste of energy.

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A Study on the Design of the Flywheel Energy Storage Device to Store the Regenerative Energy (회생에너지 저장용 플라이휠 에너지 저장 장치 설계에 관한 연구)

  • Lee, Jun-Ho;Park, Chan-Bae;Lee, Byeong-Song
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.7
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    • pp.1045-1052
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    • 2013
  • In this study we deal with design procedures for the flywheel energy storage system that has the capacity to store the regenerative energy produced from the railway vehicles. The flywheel energy storage system (FESS) stores the regenerative electrical energy into the high speed rotational flywheel, by conversion the electrical energy into the mechanical rotational energy. Thus the FESS is composed of the energy conversion components, such as the motor and generator, mechanical support components, such as the rotational rotor, the magnetic bearings to support the rotor, and the digital controller to control the air gap between the rotor and the magnetic bearings. In this paper the design procedures for the rotor operating at the rigid mode and the magnetic bearings to support the rotational rotor without contact are presented.