Harmonic Assessment for Wind Parks Based on Sensitivity Analysis

The wind power generation is currently a promising renewable energy technology. A critical feature of wind park is the existence of large distributed capacitance because of the cable laying and offshore cable transmission. This phenomenon is likely to cause harmonic resonance issues, and may threat the safety operation of wind parks. Meanwhile, the operation condition of wind turbines and the topology of wind parks affect the system structure and parameters, then affect the system harmonic resonance. Therefore, a dynamic harmonic model of the most widely used doubly fed induction generator was established to study the behaviors of harmonic resonance. At the same time, other primary electrical components in wind parks are also considered, such as power cables and transformers. In this paper, the harmonic resonance of the wind park is investigated based on the measured data and the modal sensitivity analysis. With considering the impact of various parameters on the frequency and amplitude of resonance, the sensitivity indices for these parameters are also calculated. Finally, the frequency shift method is introduced to solve resonance issue.