Shifting Resonances in Wind Farms to Higher Frequencies due to TUPF Converters

Journal of control, automation and electrical systems

article

Almeida, Camila Elias¹  Cardoso Filho, Braz de Jesus¹ 

[1] Graduate Program in Electrical Engineering, Universidade Federal de Minas Gerais

关键词: Wind farms;    Resonance;    Power quality;    Harmonics;    Power converters;   

DOI  :  10.1007/s40313-018-0414-7

学科分类：自动化工程

来源: Springer

【 摘 要 】

The increasing penetration of wind power in power systems is an ongoing trend. In wind farms, harmonic distortion and resonances concern both wind turbine manufacturers and power system operators. The frequency of occurrence and amplification factors of resonances are affected by the number of wind turbines in operation, their connection in series or in parallel through the collecting grid and the type of active front-end converter employed. This paper focuses on the latter and proposes the use of the True Unity Power Factor converter as an alternative, in which the resonance avoidance feature is built-in the wind turbines and is independent of external circumstances. Besides suppressing current harmonics below the 50th order without using filter capacitors, the TUPF converter modifies the parallel resonance characteristics of the wind farm by pushing the frequencies of their occurrences to higher values, making them less likely to be excited. The nearly sinusoidal output current behavior is demonstrated via simulation and experimental results and the variation in resonance peak characteristics is corroborated by modal analysis in a case study wind farm. It is concluded that there is a significant advantage in employing these converters in wind power generation, especially at the buses identified as the most prone to being the center of resonances.

【 授权许可】

CC BY