This paper presents the results of field measure-ments of the impedance of two commercial available wind turbine reactors, performed by a sweep frequency response analyzer, sFRA. The measurements were taken in the frequency range from 20Hz to 20MHz. Comparable frequency behavior was found in all performed measurements with significant resonances at 1MHz for the 3.6 MW reactor and 2MHz for the 2.3MW reactor. Quadratic approximation was found to be suitable for the normalized resistance variation of the 2.3MW reactor in frequencies from 20Hz to 10kHz. At frequencies below 1kHz, the normalized resistance was nearly identical for both reactors. Additionally, the accuracy of the measurement instrument was validated by comparing measurement results from two simple systems, comprising of a coil (L-system) and a series combination of coils and resistors (RL-system) with the results obtained from two high precision instruments. High accuracy of the sFRA instrument was confirmed.
Proceedings of Ipst2013, 2013
Wide band models; sFRA; Reactors; Wind turbines; Frequency domain measurements
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International Conference on Power Systems Transients, 2013