Analysis of Measured Harmonic Currents and Voltages Contributed by a Commercial Wind Power System

This paper presents the measured results and harmonics generated by a commercial wind power generation system (WPGS) consisting of four identical 660 kW wind-turbine induction generators (WTIGs). The studied WPGS is connected to an 11.4 kV bus inside a large petroleum-chemical industrial mill located around the middle coast of Taiwan. The field measured results of total harmonic distortion (THD) in the current and voltage contributed by the WPGS are analyzed using a probabilistic approach since the measured quantities are random in nature. The IEEE harmonic limit is employed to check the level of penetration due to the WPGS. It is found that the THD in the current at the point of common coupling (PCC) connecting four WTIGs is larger than the 5 % limitation of IEEE.