A hybrid active islanding detection technique for single-phase inverter-based distributed generation system

2015 ◽  
Author(s):  
Nimish Kothari ◽  
B. G. Fernandes
Keyword(s):  
Distributed Generation ◽  
Single Phase ◽  
Detection Technique ◽  
Islanding Detection ◽  
Generation System ◽  
Phase Inverter ◽  
Single Phase Inverter

scholarly journals Modified phase locked loop for grid connected single phase inverter

2019 ◽  
Vol 9 (5) ◽  
pp. 3934 ◽  
Author(s):  
Eyad Radwan ◽  
Khalil Salih ◽  
Emad Awada ◽  
Mutasim Nour
Keyword(s):  
Time Delay ◽  
Distributed Generation ◽  
Phase Angle ◽  
Single Phase ◽  
Phase Locked Loop ◽  
Accurate Information ◽  
Major Drawback ◽  
Phase Inverter ◽  
Grid Synchronization ◽  
Single Phase Inverter

Connecting a single-phase or three-phase inverter to the grid in distributed generation applications requires synchronization with the grid. Synchronization of an inverter-connected distributed generation units in its basic form necessitates accurate information about the frequency and phase angle of the utility grid. Phase Locked Loop (PLL) circuit is usually used for the purpose of synchronization. However, deviation in the grid frequency from nominal value will cause errors in the PLL estimated outputs, and that’s a major drawback. Moreover, if the grid is heavily distorted with low order harmonics the estimation of the grid phase angle deteriorates resulting in higher oscillations (errors) appearing in the synchronization voltage signals. This paper proposes a modified time delay PLL (MTDPLL) technique that continuously updates a variable time delay unit to keep track of the variation in the grid frequency. The MTDPLL is implemented along a Multi-Harmonic Decoupling Cell (MHDC) to overcome the effects of distortion caused by gird lower order harmonics. The performance of the proposed MTDPLL is verified by simulation and compared in terms of performance and accuracy with recent PLL techniques.

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