Power Quality Analysis of Wind Turbines. Part II-Dynamic Analysis

Abstract

This is the second part of a study on Power Quality (PQ) analysis of Wind Turbines (WT) installed in wind farms. A specifically designed measurement system has been installed in three wind farms with three different types of asynchronous generators of 600 kW and 700 kW classes.

This part is focused on the analysis of transient events, connections and disconnections and power fluctuations. A new method to study power fluctuations based in joint time-frequency analysis is proposed.

Transient events such as connection of capacitor banks are studied with the waveforms. The firing of thyristors during soft start is also studied through waveforms. The whole evolution during the connection of the generator is analyzed through the RMS value of each cycle of the grid because it is a longer transient. Power fluctuations are also studied through values of current and power each cycle or half-cycle.