Ana MORALES, Jean-Claude MAUN
ULB, Power Systems Department – Bruxelles
The purpose of this paper is to discuss the grid impedance assessment method at wind farm terminals. The non-intrusive method uses variations of the wind power production, and this permanent variability allows us to apply the source impedance identification process, assuring its assessment. New algorithms are developed taking as a reference the accurate GPS synchronized measurement of phase at a very stable power plant, to evaluate the source impedance at a wind farm point of common coupling (PCC) where complex variations of the voltage are expected. The instantaneous value of the grid impedance will, not only, allow assigning responsibilities but also will facilitate the design of equipments, network components, control systems tuning and protections configuration. The development of dispersed generation will be positively influenced by the capacity of measuring the network strength.
THE TRUE HARMONIC EMISSION LEVEL
Standards are ready  providing recommendations for preparing the measurements and assessment of power quality characteristics of wind turbines. One important question is raised: Are these fluctuations caused by the wind turbine or by other fluctuating loads? In other words, who is responsible? Generally, the influence of a wind turbine on the voltage quality of the grid depends not only on the turbine but also on the grid where it is connected. The European Wind Turbine Testing Procedure (EWTTP)  report has illustrated that the grid impedance angle and short circuit power have an important influence on power quality. We are then facing a very complex problem: how to assess the emission level of a particular distorted generation taking into account the instantaneous fundamental and harmonic source impedance variations of a power... [continues]
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(2011, 09). Power Quality Responsibilities by Grid Impedance Assessment at a Wind Power Production. StudyMode.com. Retrieved 09, 2011, from http://www.studymode.com/essays/Power-Quality-Responsibilities-By-Grid-Impedance-784606.html
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