Park's Transformation for Electric Power Quality Recognition and Classification in Distribution Networks

This paper presents a novel algorithm for recognizing and classifying the power quality events based on Park's transformation, where the three rotating abc phases are transferred to three equivalent stationary dq0 phases d-q reference frame. This transformation is implemented, either for three-phase or single phase circuits. The proposed algorithm transferred the utility signal to a complex phasor transformation from time domain to frequency domain. The magnitude of this phasor depends on the magnitude of the signal either a three-phase or a single phase signal. The proposed technique produces the complex phasor loci that depend on the type of power quality event; voltage sags, voltage flickers, voltage swell, and harmonics. The time of starting the disturbance is chosen randomly and the length of disturbance is arbitrary. Implementation of this technique is succeeded in recognizing and classifying the power quality events. Simulated results are presented within the text, for three-phase and single phase events.

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