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Name
Aaltodoc Publication Archive
Type
Institutional Repository
Items
8395 Publications
Compatibility
OpenAIRE 3.0 (OA, funding)
OAI-PMH
https://aaltodoc.aalto.fi/oai/openaire
More information
Detailed data provider information (OpenDOAR)

 

  • Integration of variable renewable energy in national and international energy systems: modelling and assessment of flexibility requirements

    Zakeri, Behnam (2016)
    National energy policies seek to increase the share of local renewable energy to meet the targets for climate change mitigation and to enhance the energy security. In this respect, large-scale integration of variable renewable energy (VRE) seems to be a predominant option. To cope with the intermittency of VRE, energy systems need to employ different "flexibility" solutions to match energy supply and demand in different time scales.  This dissertation examines the flexibility of an energy ...

    Impedance matching and tuning of non-resonant mobile terminal antennas

    Valkonen, Risto (2013)
    The volume reserved for antennas in a mobile handset is very limited. Furthermore, the laws of physics state that the efficiency and/or the bandwidth of a small antenna are also limited. Despite this fact, the antennas of the future mobile terminals should operate efficiently at increasingly many frequency bands. This doctoral thesis contributes to solving some of the main challenges arising from the theoretical and practical limitations of handset antennas. Non-resonant capacitive couplin...

    A Combined Position and Stator-Resistance Observer for Salient PMSM Drives: Design and Stability Analysis

    Hinkkanen, Marko; Tuovinen, Toni; Harnefors, Lennart; Luomi, Jorma (2012)
    A reduced-order position observer with stator-resistance adaptation is proposed for motion-sensorless permanent-magnet synchronous motor drives. A general analytical solution for the stabilizing observer gain and stability conditions for the stator-resistance adaptation are derived. Under these conditions, the local stability of the position and stator-resistance estimation is guaranteed at every operating point except the zero frequency, if other motor parameters are known. Furthermore, the ...

    Conformal and multi-band antennas for future mobile handsets and wireless sensors

    Rasilainen, Kimmo (2017)
    Desired performance of handsets and wireless sensors used in communications systems of current and future generations places significant challenges also on designing the antennas used in these devices. The antennas must adhere to requirements of existing frequency allocations, and in the case of handsets, must be compatible with multi-band and multi-antenna implementations for enhanced performance. This thesis studies the operation of electrically small antennas for particular implementations...
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