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PROJECT TITLE :

Dynamic Phasor Modeling of Type 3 DFIG Wind Generators (Including SSCI Phenomenon) for Short-Circuit Calculations

ABSTRACT:

Short-circuit modeling of wind generators is crucial to determine protecting relay and control settings, equipment ratings, and to produce data for cover coordination. The short-circuit contribution of a Kind three wind farm connected to a series-compensated line is tormented by subsynchronous interactions, making it essential to model such behavior. Fundamental frequency models are unable to represent the bulk of critical wind generator fault characteristics. The complete electromagnetic transient (EMT) models, though correct, demand high levels of computation and modeling experience. This paper proposes a novel modeling technique for a Kind three wind farm primarily based on the generalized averaging theory, where system variables are represented using time-varying Fourier coefficients referred to as dynamic phasors. The novelty and advantage of the proposed modeling technique is that it will not simply embody 60-Hz frequencies however additionally other dominant frequencies, such as 36 Hz, that are gift due to the SSCI in the system. Methods currently used by the business mostly rely on fundamental frequency-based analysis. Only the acceptable dynamic phasors are selected for the specified fault behavior to be represented, improving computational potency. Once the SSCI behavior (waveforms showing resonant frequency at the purpose of common coupling) of a series-compensated Type three wind farm from real-time field knowledge is on the market, the developed model may be used to simulate the situation while not essentially having to know the precise control blocks of the wind generator controls. A 450-MW Sort three wind farm, consisting of 150 units, was modeled using the proposed approach. The tactic is shown to be accurate for representing faults at the purpose of interconnection of the wind farm to the grid for balanced and unbalanced faults along with for nonfundamental frequency parts gift in fault currents during subsynchronous interactions.


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