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Energies 2018, 11(6), 1486; https://doi.org/10.3390/en11061486

Small-Signal Performance of Type 4 Wind Turbine Generator-Based Clusters in Power Systems

1
School of Electrical and Information Engineering, The Jiangsu University, Zhenjiang 212013, China
2
School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518100, China
3
School of Electrical and Information Engineering, The University of Sydney, Sydney, NSW 2006, Australia
*
Authors to whom correspondence should be addressed.
Received: 28 April 2018 / Revised: 3 June 2018 / Accepted: 4 June 2018 / Published: 7 June 2018
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Abstract

The impact of Type 4 wind turbine generator (WTG)-based 10 million megawatt clusters (TMMC) on small-signal dynamics of power systems was investigated using the second-generation generic models (GM) of Western Electricity Coordinating Council (WECC). A WTG participation index (WTG PI) was defined to investigate the impact of Type 4 WTGs on the traditional interarea electromechanical modes. To identify the new electromechanical modes dominated by Type 4 WTGs, an identification factor (IF) was also defined using participation factors. Given the increasing penetration of Type 4 WTGs replacing synchronous generators, the changed law of damping and frequencies of the traditional interarea modes was also investigated using the WTG PI. One new type of electromechanical mode dominated by Type 4 WTGs was identified by using the defined IF. These new modes can be divided into two categories: strong-interaction modes and weak-interaction modes, depending on the number of participating WTGs. The strong-interaction modes dominated by Type 4 WTGs can result in widely spread power oscillations in power systems. The results of small-signal analysis were validated by time domain simulation and mode detection. View Full-Text
Keywords: generic model (GM); wind turbine generators (WTGs); damping ratio; small-signal stability generic model (GM); wind turbine generators (WTGs); damping ratio; small-signal stability
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Chen, W.; Teng, Z.; Zhao, J.; Qiu, J. Small-Signal Performance of Type 4 Wind Turbine Generator-Based Clusters in Power Systems. Energies 2018, 11, 1486.

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