Special Issue "Flywheel Energy Storage Systems and Applications"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Energy Storage and Application".

Deadline for manuscript submissions: 31 May 2020.

Special Issue Editor

Prof. Keith Robert Pullen
E-Mail Website
Guest Editor
Department of Engineering, School of Mathematics, Computer Science and Engineering, City University of London, London, UK
Interests: flywheel energy storage; power systems; high-speed machines; hybrid power systems; energy recovery; small turbomachines

Special Issue Information

Dear colleagues,

Flywheel energy storage has the potential to play a significant role in the transformation of electrical power systems to those with the highest sustainability yet lowest cost. The penetration of renewable energy generation has created new challenges, which ultimately can only be solved by means of fast response energy storage. For example, as synchronous generation is removed from electricity grids, the ability of the system to maintain a steady frequency is compromised. Here lies the opportunity for flywheel storage, whose characteristics typically place it between ultra-capacitors and electrochemical batteries. Although electrochemical batteries are currently dominating the market for fast response storage, flywheels offer a very high cycle and calendar life, and are fully sustainable in terms of raw materials’ ease of recycling. Flywheels may also be hybridized with batteries in order to benefit from the strengths of each technology. As well as stationary grid applications, flywheels may be deployed for energy recovery in transport, either on board the vehicles or at strategic locations, for instance, in railway stations.

Contributions are invited in the following areas:

  • Rotor research including safety and containment
  • Low loss bearing systems
  • Novel motor-generator technologies and drives
  • Integrated flywheel motor-generator systems
  • Vacuum systems
  • Rotor dynamics
  • Hybrid micro and mini grids—integration of renewables with flywheel storage
  • Hybrid storage system—integration of flywheel storage with batteries or other storage systems
  • Trackside storage in electrified rail transport
  • Vehicle kinetic energy recovery

Prof. Keith Robert Pullen
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • flywheel energy storage
  • low friction bearings
  • vacuum systems
  • mini grids
  • kinetic energy recovery

Published Papers (2 papers)

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Research

Open AccessArticle
Design and Modeling of an Integrated Flywheel Magnetic Suspension for Kinetic Energy Storage Systems
Energies 2020, 13(4), 847; https://doi.org/10.3390/en13040847 - 14 Feb 2020
Abstract
The paper presents a novel configuration of an axial hybrid magnetic bearing (AHMB) for the suspension of steel flywheels applied in power-intensive energy storage systems. The combination of a permanent magnet (PM) with excited coil enables one to reduce the power consumption, to [...] Read more.
The paper presents a novel configuration of an axial hybrid magnetic bearing (AHMB) for the suspension of steel flywheels applied in power-intensive energy storage systems. The combination of a permanent magnet (PM) with excited coil enables one to reduce the power consumption, to limit the system volume, and to apply an effective control in the presence of several types of disturbances. The electromagnetic design of the AHMB parts is carried out by parametric finite element analyses with the purpose to optimize the force performances as well as the winding inductance affecting the electrical supply rating and control capability. Such investigation considers both the temperature dependence of the PM properties and the magnetic saturation effects. The electrical parameters and the force characteristics are then implemented in a control scheme, reproducing the electromechanical behavior of the AHMB-flywheel system. The parameter tuning of the controllers is executed by a Matlab/Simulink code, examining the instantaneous profiles of both the air-gap length and the winding ampere-turns. The results of different dynamic tests are presented, evidencing the smooth air-gap changes and the optimized coil utilization, which are desirable features for a safe and efficient flywheel energy storage. Full article
(This article belongs to the Special Issue Flywheel Energy Storage Systems and Applications)
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Open AccessArticle
A Novel Energy Recovery System Integrating Flywheel and Flow Regeneration for a Hydraulic Excavator Boom System
Energies 2020, 13(2), 315; https://doi.org/10.3390/en13020315 - 09 Jan 2020
Abstract
Implementing an energy recovery system (ERS) is an effective solution to improve energy efficiency for hydraulic excavators (HEs). A flywheel energy recovery system (FERS) is proposed based on this concept. A hydraulic pump motor (PM) is employed as the energy conversion component and [...] Read more.
Implementing an energy recovery system (ERS) is an effective solution to improve energy efficiency for hydraulic excavators (HEs). A flywheel energy recovery system (FERS) is proposed based on this concept. A hydraulic pump motor (PM) is employed as the energy conversion component and a flywheel is used as the energy storage component. Since the pressure is low because the bucket is usually empty as the boom lowers, a relatively large PM should be used in the FERS. To overcome this drawback, a novel compound energy recovery system integrating flywheel and flow regeneration (FFERS) is proposed in this paper. The working principle of the system is analyzed in detail. The introduction of flow regeneration has two benefits; one is downsizing the displacement of PM and the other one is an extra improvement of energy efficiency. The primary parameters of both are matched based on a 4 t excavator. Compared with the PM used in the FERS, the PM displacement in the FFERS is reduced by 71%. For comparison, a general model that can operate in either the FERS mode or the FFERS mode is developed in AMESim. The modeling results show that the FFERS with a downsized PM contributes a 13% increase in energy recovery and reutilization efficiency (62%) as compared with the FERS. Full article
(This article belongs to the Special Issue Flywheel Energy Storage Systems and Applications)
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