Wind turbine optimal control for reduction of structural loads in strong winds

Petrović, Vlaho

prikaz prve stranice dokumenta Wind turbine optimal control for reduction of structural loads in strong winds

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doctoral thesis

Wind turbine optimal control for reduction of structural loads in strong winds

Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2013. urn:nbn:hr:168:121312

Petrović, Vlaho

University of Zagreb
Faculty of Electrical Engineering and Computing
Department of Control and Computer Engineering

Cite this document

APA 6th Edition

Petrović, V. (2013). Wind turbine optimal control for reduction of structural loads in strong winds (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:121312

MLA 8th Edition

Petrović, Vlaho. "Wind turbine optimal control for reduction of structural loads in strong winds." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2013. https://urn.nsk.hr/urn:nbn:hr:168:121312

Chicago 17th Edition

Harvard

Petrović, V. (2013). 'Wind turbine optimal control for reduction of structural loads in strong winds', Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 10 September 2024, https://urn.nsk.hr/urn:nbn:hr:168:121312

Vancouver

Petrović V. Wind turbine optimal control for reduction of structural loads in strong winds [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2013 [cited 2024 September 10] Available at: https://urn.nsk.hr/urn:nbn:hr:168:121312

IEEE

V. Petrović, "Wind turbine optimal control for reduction of structural loads in strong winds", Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2013. Available at: https://urn.nsk.hr/urn:nbn:hr:168:121312

Cite this item: https://urn.nsk.hr/urn:nbn:hr:168:121312

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Metadata

Title	Wind turbine optimal control for reduction of structural loads in strong winds
Title (croatian)	Optimalno upravljanje vjetroagregatom s ciljem smanjenja strukturnih opterećenja pri jakim vjetrovima
Author	Vlaho Petrović
Mentor	Mato Baotić (mentor)
Mentor	Mate Jelavić (komentor)
Committee member	Mato Baotić (član povjerenstva)
Granter	University of Zagreb Faculty of Electrical Engineering and Computing (Department of Control and Computer Engineering) Zagreb
Defense date and country	2013, Croatia
Scientific / art field, discipline and subdiscipline	TECHNICAL SCIENCES Electrical Engineering Automation and Robotics
Universal decimal classification (UDC)	621.3 - Electrical engineering
Abstract	In this thesis, control algorithms for reduction of wind turbine structural loads in strong winds have been researched. Such reduction is essential for prolongation of expected lifetime of wind turbine and for enabling further increase of its dimensions and rated power. Two approaches are considered for achieving reduction of wind turbine structural loads. Firstly, a control algorithm is designed for very high wind speeds (typically present during storms). This control algorithm enables wind turbine operation even when standard control system has to shut the wind turbine down thus improving wind farm behaviour in the electrical grid. An online optimisation for determining worst-case prediction of the wind speed is used, and based on such prediction, wind turbine power reference is changed to avoid excessive wind turbine structural loads. A second approach for reduction of wind turbine structural loads described in the thesis is focused on wind speeds above nominal wind speed. Standard individual pitch control algorithms and higher harmonic control algorithms are extended to enable the reduction of structural loads caused by rotor asymmetry. Furthermore, appropriate transformations of structural loads are defined that enable the use of structural load measurements from any part of the wind turbine, both rotating and non-rotating, to achieve reduction of structural loads. The reduction of structural loads is incorporated in a multi-criteria controller to improve wind turbine performance, with special emphasis on the satisfaction of pitch actuator constraints. To this end, a procedure is derived that allows better integration of the pitch actuator limitations (when considering structural loads reduction) within the model predictive control strategy. Finally, two scaled wind turbine models suitable for experimental validation of control algorithms in wind tunnels are presented. Such scaled models bridge the gap between numerical simulations and field tests, thus improving the procedure for validation of new control algorithms. Reported experimental results indicate that the presented scaled wind turbine models can be used for this purpose.
Abstract (croatian)	U ovoj disertaciji, istraženo je smanjenje strukturnih opterećenja vjetroagregata korištenjem naprednih algoritama upravljanja. Smanjenje opterećenja je nužno za produljenje životnog vijeka vjetroagregata, odnosno za omogućavanje daljnjeg porasta dimenzija i nazivne snage vjetroagregata. Razmatrana su dva pristupa za smanjivanje strukturnih opterećenja vjetroagregata. Prvi pristup odnosi se na algoritam upravljanja projektiran za iznimno jake vjetrove (za olujno vrijeme). Razvijeni algoritam upravljanja omogućuje rad vjetroagregata pri brzinama vjetra kod kojih standardni algoritmi upravljanja isključuju vjetroagregat, čime se postiže povoljnije vladanje vjetroelektrane u elektroenergetskom sustavu. Najprije se koristi linearni optimizacijski problem za predviđanje vjetra koji bi uzrokovao najveća opterećenja, a potom se prilagođava referenca snage vjetroagregata kako bi se izbjegla prekomjerna opterećenja i u slučaju da se ostvari predviđeni vjetar. Drugi pristup za smanjenje strukturnih opterećenja vjetroagregata fokusiran je na brzine vjetra iznad nazivnog iznosa. Standardni algoritmi za pojedinačno zakretanje lopatica su prošireni kako bi se omogućilo smanjenje opterećenja uzrokovanih asimetrijama rotora. Nadalje, definirane su prikladne transformacije opterećenja koje omogućuju smanjenje strukturnih opterećenja korištenjem mjerenja opterećenja u proizvoljnim točkama vjetroagregata. Smanjenje strukturnih opterećenja je uključeno u višekriterijski regulator s ciljem postizanja kvalitetnijeg vladanja vjetroagregata, pri čemu je poseban naglasak dan na poštivanje ograničenja aktuatora za zakret lopatica. U tu svrhu, razvijen je postupak koji omogućava integraciju ograničenja aktuatora za zakret lopatica (uz korištenje pojedinačnog zakretanja lopatica) u algoritme modelsko prediktivnog upravljanja. Naposljetku, opisana su dva skalirana modela vjetroagregata prikladna za eksperimentalnu provjeru algoritama upravljanja u zračnim tunelima. Takvi skalirani modeli predstavljaju poveznicu između numeričkih simulacija i eksperimenata na terenu te unaprjeđuju postupak provjere novih algoritama upravljanja. Prikazani eksperimentalni rezultati pokazuju da su opisani skalirani modeli vjetroagregata prikladni za tu svrhu.
Keywords
Keywords (croatian)
Language	english
URN:NBN	urn:nbn:hr:168:121312
Study programme	Title: Electrical Engineering and Computing Study programme type: university Study level: postgraduate Academic / professional title: Doktor znanosti elektrotehnike i računarstva (Doktor znanosti elektrotehnike i računarstva)
Type of resource	Text
Extent	206 str. ; 30 cm.
File origin	Born digital
Access conditions	Closed access
Terms of use
Repository	FER Repository
Created on	2019-04-19 14:13:31