NDLI: Volt-ampere ratings in electronically tuned linear alternators for thermoacoustic engines

Content Provider	IET Digital Library
Author	Iacchetti, Matteo F. Shuttleworth, Roger Zhang, Min
Abstract	Linear alternators (LAs) coupled to thermoacoustic engines (TAEs) provide a viable solution to extract energy from a heat source in a variety of applications such as waste heat, energy harvesting, solar thermal and biomass power generation. For the electrical power to be maximised, the acoustic impedances of LA and TAE have to match. This requirement cannot, in general, be met by relying only on the design of the LA, but can be achieved at the control level, by using a fraction of the LA inverter current to create ‘electronic stiffness’ which contributes to the overall stiffness tuning the resonance frequency. The same concept can, in principle, be used to replace part of the mechanical spring stiffness in order to overcome the limitations in the mechanical design, at the expense of an increase in LA and inverter ratings. The impact of electronic stiffness on LA power capability and ratings is analysed here. Two meaningful scenarios are considered in the analysis: the LA derating for resonance frequency tuning and the oversizing when springs are partially replaced by electronic stiffness. The study is supplemented with experiments on a small-scale LA test rig.
Starting Page	1256
Ending Page	1262
Page Count	7
ISSN	17521416
Volume Number	12
e-ISSN	17521424
Issue Number	Issue 11, Aug (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/12/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2017.0134
Journal	IET Renewable Power Generation
Publisher Date	2018-04-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acoustic Impedances Acoustic Property (mechanical Engineering) Acoustics Alternators Biomass Power Generation Electronic Stiffness Electronically Tuned Linear Alternators Energy Harvesting Engines Heat Source LA Inverter Current LA Power Capability Mechanical Mechanical Design Mechanical Spring Stiffness Resonance Frequency Tuning Small-scale LA Test Rig Solar Thermal Springs Stiffness Tuning Synchronous Machine TAE Thermoacoustic Engines Volt-ampere Ratings Waste Heat
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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