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LTS Flywheel - Long Term Storage-Flywheel: New approaches for increasing the economically usable storage time and safety
Within this research project the fundamentals for a Long Term Storage (LTS)-flywheel for decentralized storage of electrical energy (e.g. from wind or PV power plants), with a significant increase in storage time (goal: 12 hours) and safety, featuring low system costs. Therefore, the LTS-Flywheel is an essential contribution to the building of the future.
Titel und Synopse
Entwickelt werden die Grundlagen für ein Long Term Storage (LTS)-Flywheel zur dezentralen Zwischenspeicherung von elektrischer Energie (z.B. aus Windkraft- oder PV-Anlagen), mit wesentlich höherer Speicherzeit (Ziel: 12h) und Betriebssicherheit bei geringen Systemkosten. Dieses Projekt stellt die Basis für einen weiteren Schritt Richtung Plus-Energie-Haus dar.
Project description / tasks
Status
ongoing
Summary
Starting point / motivation
Flywheels are a sustainable solution for decentralized energy storage. They offer longer life cycles (over 25 years), no requirement for maintenance, and usage of harmless, easily available materials, compared with other storage technologies, as for example accumulators. Flywheels, available up to now, are designed for short term energy storage in the region of minutes.
Contents and goals
The technological challenge within this research project is the development of fundamentals for a technology leap - Long Term Storage flywheel. Aim is a significant increase in storage time (12 hours at 80% load efficiency). Additionally, high reliability and low system costs are defined as project aims. This LTS-flywheel shall allow decentralized storage of electrical energy, for instance produced in in-house photovoltaic systems. Therefore, it is an essential contribution for developing the technological basis for the building of the future, especially the plus energy house.
Methods of treatment
For realizing the research aims, the project comprises the following focuses:
- Exploratory focus on a full parametric simulation model
Development of a full parametric simulation model for optimizing a flywheel regarding to a freely definable performance function: Definition of all required optimization parameters, determination of all interdependences, modeling of all flywheel components as MATLAB-Simulink simulation models, optimized regarding to minimal computing time.
- Exploratory focus on bearings
Development of fundamentals of a magnetic bearing system with significantly increased energy efficiency compared with present magnetic bearing systems, and high reliability - cascaded hybrid magnetic bearing system with high reliability for radial and axial stabilization. This means permanent magnetic bearings for the application of static bearing forces, highly efficient active magnetic bearings (AMBs) for minimum energy consumption during normal operation with fully-adaptive control. Further, an additional add-on high performance AMB system for start-up, interception of large external forces (e.g. earthquake) or emergency operation, as well as a redundant high performance AMB system in case of a power supply collapse or a malfunction within the regular highly efficient/high performance AMB-system.
- Exploratory focus on the rotor
Development of fundamentals for an optimum rotor design with respect to high energy storage capacity, small necessary control inputs concerning the bearing, integration of all required bearing and motor/generator components and optimum utilization of material properties (density, young's modulus, tensile strength, internal damping) with respect to rotor configuration (eigenfrequencies, material combinations, winding and lamination technology, costs of materials and manufacturing, balancing, et cetera).
- Exploratory focus on the rotor
Development of fundamentals for an optimum rotor design with respect to high energy storage capacity, small necessary control inputs concerning the bearing, integration of all required bearing and motor/generator components and optimum utilization of material properties (density, young's modulus, tensile strength, internal damping) with respect to rotor configuration (eigenfrequencies, material combinations, winding and lamination technology, costs of materials and manufacturing, balancing, et cetera).
- Exemplary optimization for 12h-energy storage for photovoltaic systems and experimental validation of the research results
Exemplary optimization of the whole system as LTS-flywheel with 12h-storage time for photovoltaic systems using MATLAB-Simulink and PSpice co-simulation. Validation of the research results, using a test arrangement based on the optimization results. Investigation of total power losses dependent on diverse operational states (rotary speed, load momentum, behaviour in case of component faults or sudden high bearing forces, power supply collapse).
Expected results / conclusions
The results of the proposed research project will serve as a basis for a cooperative technology development with an industry partner, or a company founding, respectively.
Project partners
Project management
Dipl.-Ing. Dr.techn. Alexander Schulz
Vienna University of Technology, department for mechanics and mechatronics
Contact address
Technische Universität Wien, Institut für Mechanik und Mechatronik
Abteilung 4: Messtechnik und Aktorik
Dipl.-Ing. Dr.techn. Alexander Schulz
Wiedner Hauptstrasse 8-10/E325
A-1040 Wien, Österreich
Tel.: +43 (1) 58801 - 30313
Fax: +43 (1) 58801 - 30399
E-Mail: alexander.schulz@tuwien.ac.at
