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Unpredictable power quality (PQ) events such as, balanced and unbalanced voltage sag/swell, frequency shift, phase jump and harmonic distortions in the utility grid voltage drastically affects the performance of a grid interfaced distributed generation (DG) systems due to unreliable synchronization. This paper presents adaptive synchronization based dq-current control technique for three-level NPC...
This paper presents comparative performance evaluation of conventional SRF-PLL, existing adaptive notch filter (ANF) and an amplitude adaptive notch filter (AANF) based synchronization techniques used for converter-interfaced renewable energy systems. In addition, real time implementation and extraction of frequency and amplitude of the input grid voltage signal by all the three techniques has been...
A rapid grid synchronization technique is proposed for enhanced low voltage ride-through (LVRT) operation of voltage source inverter based distributed energy resource (DER). The proposed synchronization method aims at enhancing the LVRT capability by providing fast information of the fundamental positive and negative sequence components of the grid voltage vector. This is achieved by a novel pre-filter,...
Synchronous reference frame phase-locked loop (SRF PLL) is extensively employed for grid converter synchronization applications. When the input contains the fundamental positive sequence (FPS) component alone, it performs exceedingly well. However, with harmonic contamination and unbalance in the input, its performance degrades. For this purpose, many structural modifications are proposed. In this...
To ensure safe and reliable operation of power system based on wind energy, usually plant operators should satisfy grid code requirements such as grid stability, fault ride through (FRT), power quality improvement, grid synchronization and power control etc. To satisfy the grid code requirements of wind turbine, usually grid side converter is playing a major role. So in order to improve the operation...
In this paper an implementation of improved voltage oriented control for AC-DC converter has been presented and investigated. Algorithm is based on independent control of positive and negative current sequences. It contains different blocks responsible for grid synchronization, mitigation of 100 Hz component, current control and sequence extraction. Different line voltage feedforwards have been implemented...
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