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PhD defence by Esmaeil Ebrahimzadeh on Electrical Oscillations in Wind Power Plants - Modeling, Control, and Mitigation

Time

15.05.2018 kl. 13.00 - 15.05.2018 kl. 16.00

Description

Esmaeil Ebrahimzadeh, Department of Energy Technology, will defend the thesis "Electrical Oscillations in Wind Power Plants - Modeling, Control, and Mitigation"

TITLE

Electrical Oscillations in Wind Power Plants - Modeling, Control, and Mitigation

PHD DEFENDANT

Esmaeil Ebrahimzadeh

SUPERVISOR

Professor Frede Blåbjerg

MODERATOR

Associate Professor Huai Wang

OPPONENTS

Professor Zhe Chen, Dept. of Energy Technology, Aalborg University (Chairman)
Professor Marta Molinas, NTNU, Norway
Professor Jianhui Wang, Argonne National Laboratory, USA

ABSTRACT

Nowadays, the amount of integration of Wind Turbines (WTs) and Wind Power Plants (WPPs) into the electrical grid is increasing. Besides the advantages like sustainability, eco-friendly, and controllability, a high penetration of WPPs is challenging the stability, reliability, and power quality of the electrical grid.  Among power quality issues, harmonics and electrical oscillations around and above the fundamental frequency are common phenomena in WPPs and gaining more and more attention. In the literature, these electrical oscillations have been called different names such as harmonic stability, small signal stability, dynamic stability, harmonic resonance, dynamic resonance, or electromagnetic transient stability. This project is focusing on modeling, analysis, control, design, and mitigation of such electrical oscillations in WPPs.  In this regard, comprehensive research are done about electrical modeling of WTs and power electronic converters, harmonics and resonances, as well as optimization and mitigation of the problem.

As time-domain simulation analysis has a high computational burden for large systems, in this thesis, a WPP is modelled in the linearized frequency-domain by a Multi-Input Multi-Output (MIMO) transfer function matrix. The oscillatory modes and electrical resonances of the WPP are identified by the determinant of the MIMO matrix. The effects of the various phenomena on electrical oscillations, including the number of WTs, grid Short-Circuit Ratio (SCR), cable lengths, and controller bandwidths, are discussed.

In order to find the main source of the oscillations and resonances, Participation Factor (PF) and sensitivity analysis based on the MIMO matrix are presented. PF analysis can locate which WT can contribute more in the electrical oscillations or which bus can excite the resonances.   A bus with the largest PF can be selected as the best place for doing active or passive damping activities.

In order to reduce the electrical oscillations and resonance probability, an optimum design procedure in the frequency-domain is presented to put the oscillatory modes of the WPP into the desired locations with acceptable damping. The optimum design can guarantee a stable operation of the WPP and damp the oscillations, while it is also robust against variations in the system.

Non-linear time-domain simulations of a 400-MW WPP in the PSCAD/EMTDC software environment are provided to confirm the effectiveness of the proposed model, analysis, and design.

Keywords: Wind Power Plant (WPP), Wind Turbine (WT), Modeling, Participation Factor (PF) Analysis, Control, Design, Optimization, Electrical Oscillations, Harmonic Stability, Small Signal Stability, Harmonic Resonance, Electromagnetic Transient Stability.

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PhD defence by Esmaeil Ebrahimzadeh on Electrical Oscillations in Wind Power Plants - Modeling, Control, and Mitigation

ALL ARE WELCOME. THE DEFENCE WILL BE IN ENGLISH.

AFTER THE DEFENCE THERE WILL BE AN INFORMAL RECEPTION AT PONTOPPIDANSTRAEDE 111 IN ThE COFFEE ROOM.

 

 

Host

Department of Energy Technology

Address

Pontoppidanstræde 111, auditorium 1.177

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