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Future power systems will include the massive utilization of distributed generation mainly based on renewable energy resources. These renewable energy resources can be interconnected to the utility grid by means of power electronics converters working as Voltage Source Inverters (VSIs) which must be synchronized with the utility voltage. Synchronization methods are mandatory to make possible a correct...
This paper presents an active method in detecting islanding for Dispersed Generation (DG) by injecting small amount (0.5%) of negative current into the point of common coupling (PCC), and then the negative system impedance will be measured. In this study, Adaptive Notch Filter (ANF) makes a debut as a synchronous part instead of Phase-Locked Loop (PLL) and as a signal processing unit as well. The...
In this paper, grid synchronization for gird-connected power generation systems in the presence of voltage unbalance and frequency variation is considered. A new extended Kalman filter based synchronization algorithm is proposed to track the phase angle of the utility network. Instead of processing the three-phase voltage signal in the abc natural reference frame and resorting to the symmetrical component...
This paper briefly reviews the adaptive notch filter (ANF) based synchronization techniques for single and three-phase converter-interfaced distributed generation (DG) systems. These techniques are compared in terms of their capability in tracking the grid frequency variations in the presence of low order harmonics and unbalance conditions. The techniques introduced in this paper are applicable for...
This paper briefly reviews the synchronization techniques for single-phase converter-interfaced distributed generation (DG) systems. These techniques are compared in terms of their capability in tracking frequency variations, and the phase angle of the grid signal in the presence of low order harmonic. The techniques introduced in this paper are applicable for a wide range of equipment like converter-interfaced...
This paper introduces a new adaptive synchronization tool for use in single-phase grid-connected converters. The proposed technique is simple and capable of extracting harmonics, tracking the frequency variations, and providing the amplitude and phase angle of the grid signal. The methodology is applicable for a wide range of equipment such as converter-interfaced distributed generation (DG) units,...
The number of equipments based on static converters such as uninterrupted power systems, series or shunt compensators and distributed generations systems is increasing in the actual power distribution systems. For a correct operation in grid connected condition, these equipments need the information about amplitude, phase angle and frequency of the grid fundamental voltages and currents. Since noise...
This paper introduces a new adaptive notch filtering (ANF) approach as a powerful tool for synchronization of the single-phase converter-interfaced DG systems. The technique is simple and capable of extracting harmonics, tracking the amplitude and frequency variations, and providing the phase angle of the grid signal. The methodology is applicable for a wide range of equipment like converter- interfaced...
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