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Frequency-scan approaches for conducting Sub-Synchronous Control Interaction (SSCI) studies of wind farms is becoming a normal practice in the industry. Modern power electronics control used in many wind generators has a characteristic that couples two frequency components, similar to saliency effects of conventional generators. As a consequence, treating both wind farm and grid as single-dimension impedances could generate an inaccurate result. This paper describes a two-dimension transfer function approach that can be practically applied to ensure accuracy when evaluating SSCI aspects of power-electronic equipment such as renewable generation.
Ren et al. (Tue,) studied this question.
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