Analysis of wind farm islanding experiment

Pedersen, J.K.; Akke, Magnus; Poulsen, Niels Kjølstad; Pedersen, Knud Ole Helgesen

doi:10.1109/60.849125

Cited by 17 publications

(4 citation statements)

References 7 publications

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“…The higher harmonics stemmed presumably from the induction machines, coinciding with the results of previous studies (Pedersen et al, 2000). 50 Hz as in Denmark) were present in the measured current.…”

Section: Measured Behavioursupporting

confidence: 90%

Full‐Scale Verification of Dynamic Wind Turbine Models

Akhmatov

2012

Wind Power in Power Systems

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The share of electricity-producing wind turbines in the electric power supply mix has increased dramatically world-wide. From a promising electric energy source just a few years ago, wind power has transformed into a mainstream power technology. Nowadays, the rated power of each wind turbine in a wind power plant (WPP) is in the range of several megawatts and the wind turbines typically use converter-controlled generators; that is, Types III and IV wind turbines (Johnson et al., 2009;Kn€ uppel et al., 2010). 1 However, fixed-speed, inductiongenerator-based wind turbines (that is, Type I wind turbines) are still a relevant technology used by specific manufacturers, markets and projects (Akhmatov, 2006). The rated power of such Type I commercial wind turbines is up to 2.3 MW.Independent of wind turbine technology, many projects require a validated wind turbine model as a code, a description, or both (AEMO, 2008;Energinet.dk, 2010; NGET, 2010; RED, 2008). A common requirement has been that models are sufficiently accurate, validated by measurements on physical wind turbines and suitable for investigations of power system stability (AEE, 2007;Fortmann et al., 2009;FWG, 2009). Mostly, short-term voltage stabilitythat is, the response of the wind turbines to three-phase, balanced short-circuit faults of different depths and durations -is typically the scope of such models and investigations.Currently, manufacturers are also asked to supply models suitable for simulations of singlephase-ground, phase-phase and two-phase-ground unbalanced short-circuit faults (Akhmatov et al., 2010;Fortmann et al., 2009). In certain power systems, for instance in Australia, twophase-ground short-circuit faults (followed by a temporary outage and automatic reconnection

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Section: Measured Behavioursupporting

confidence: 90%

Full‐Scale Verification of Dynamic Wind Turbine Models

Akhmatov

2012

Wind Power in Power Systems

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“…Therefore, an increase in the electrical speed will lead in the increase of the mechanical speed. While the wind turbines remain in island operation, their speed will rise until it reaches the over-speed limit that will stop their operation [10].…”

Section: Introductionmentioning

confidence: 99%

Transient Model Validation of Fixed-Speed Induction Generator Using Wind Farm Measurements

Rogdakis

García-Valle

Arana

2012

IEEE Trans. Power Syst.

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Section: Introductionmentioning

confidence: 99%

“…That means that the expected distortions of signals are determined during off-nominal frequency conditions and during the rapid frequency changes. The importance of described experiments has grown up since the use of ASGs in the production of wind energy [1,2].In modern power plants, microprocessors are commonly used in protection, monitoring, control and measurement devices. Each microprocessor is programmed with the suitable numerical algorithm (software) providing the desired function.…”

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confidence: 99%

Asynchronous generator behavior after a sudden load rejection

Rebizant

Terzija²

2003 IEEE Bologna Power Tech Conference Proceedings,

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Abstract--In the paper load rejection test, performed at a hydro power plant in Sweden, equipped with asynchronous generators, is described and analysed from the electromechanical transient processes and signal distortions points of view. During the test voltages and currents at shunt capacitor and generator terminals are digitised, recorded and thereafter off-line processed. Two adaptive methods are applied for signal processing: the Newton-Type Algorithm (NTA) and the Adaptive Fourier Filter (AFF) Scheme. The features of both methods during nominal frequency conditions and severe frequency changes and signal distortions are investigated. It is proved that the adaptive approach proposed is well suited for voltage and current measurements when the signal frequency changes in a wide range.Index Terms--asynchronous generator, transient analysis, load rejection, frequency, distortions, adaptive measurements. I. INTRODUCTIONN the paper an asynchronous generator (ASG) is investigated during load rejection test. The measurements are performed at a small hydro power plant in Knisslinge, Sweden. The main goal was to analyze the transients and ASG behavior after a sudden load rejection, i.e. after its sudden disconnection from the external grid. The transients are analyzed through digital processing of recorded voltages. As expected, signals processed were distorted and frequency modulated. At the very beginning of the transient the generator mechanical driving power remains constant, thus the difference, the so-called power of inertia, accelerated the generator's shaft speed. That means that the expected distortions of signals are determined during off-nominal frequency conditions and during the rapid frequency changes. The importance of described experiments has grown up since the use of ASGs in the production of wind energy [1,2].In modern power plants, microprocessors are commonly used in protection, monitoring, control and measurement devices. Each microprocessor is programmed with the suitable numerical algorithm (software) providing the desired function. The review of modern signal processing algorithms that are usually used can be found in [3]. Unfortunately, most of the traditional estimation algorithms are designed to operate at the nominal power system frequency (within a narrow margin W. Rebizant is with the Institute of Electrical Power Engineering, Wroclaw University of Technology, Poland (e-mail: rebizant@ieee.org).V. Terzija is with the ABB Calor Emag Mittelspannung (Mediumvoltage), Ratingen, Germany (e-mail: vladimir.terzija@de.abb.com). around 50 or 60 Hz). This makes them inadequate for applications when the frequency may vary in a wider range. In this paper two efficient adaptive wide-frequency band algorithms are proposed for the processing of recorded data and for the simultaneous estimation of signal power spectrum and frequency. The Total Harmonics Distortion (THD) factor is further calculated from the harmonics measured in the first algorithm stage. In the paper the load rejection test is desc...

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Analysis of wind farm islanding experiment

Cited by 17 publications

References 7 publications

Full‐Scale Verification of Dynamic Wind Turbine Models

Full‐Scale Verification of Dynamic Wind Turbine Models

Transient Model Validation of Fixed-Speed Induction Generator Using Wind Farm Measurements

Asynchronous generator behavior after a sudden load rejection

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