Development of a Robust Phase Locked Loop System under Distorted Utility Conditions
نویسندگان
چکیده
Increased level of automation by using sophisticated equipment employing switched mode supplies, use of power electronic controllers and non-linear loads have increased disturbances and distortions in electric grid. These distorted utility conditions create additional problems of synchronization for line interactive power converters with grid. Further certain transient events like unsymmetrical faults, load unbalance, supply imperfections result in deviation of voltage of one or more phases leading to mis-operation of many phasecontrol applications. The situations are worst at point of interface of renewable energy sources connected through weak system. This paper proposes a simpler solution based on the detection of positive sequence voltages for tracking grid voltage and phase under unbalanced and highly distorted grid situations. The proposed detection method together with evaluation of PLL through a simulation study is described. Keywords— Phase Locked Loop (PLL), Utility Disturbances, Positive Sequence Detectors
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