Accurate and Less-Disturbing Active Antiislanding Method Based on PLL for Grid-Connected Converters
- 12 January 2010
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 25 (6), 1576-1584
- https://doi.org/10.1109/tpel.2010.2040088
Abstract
An accurate and less-disturbing active antiislanding method suitable for grid-connected converters using phase-locked loop (PLL) based grid synchronization is proposed in this paper. The orthogonal signal generator required by a single-phase PLL is built using a second-order generalized integrator. The inverter current reference is slightly modified each output cycle by an injected signal, and a feedback signal is extracted from the voltage of the point of common coupling (PCC). When the grid becomes unavailable, the feedback signal moves outside of a preset threshold value. The disturbance caused by this method is small compared to other active antiislanding methods, such as active frequency drift or frequency shift up/down. The method does not affect the zero crossing of the injected current, can be used to estimate the grid impedance, and is highly robust to different grid disturbances and stiffness. The performance of the proposed method has been studied through extensive simulations using MATLAB/Simulink and experiments. Selected results are presented to confirm its validity.Keywords
This publication has 29 references indexed in Scilit:
- Accurate and less-disturbing active anti-islanding method based on PLL for grid-connected PV InvertersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- Offset rejection for PLL based synchronization in grid-connected convertersAPEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition, 2008
- Islanding Detection Assessment of Multi-Inverter Systems With Active Frequency Drifting MethodsIEEE Transactions on Power Delivery, 2007
- On-line grid impedance estimation based on harmonic injection for grid-connected PV inverterPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- Online grid impedance estimation for single-phase grid-connected systems using PQ variationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- Line Impedance Estimation Using Active and Reactive Power VariationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- A new single-phase PLL structure based on second order generalized integratorPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- A Digital Controlled PV-Inverter With Grid Impedance Estimation for ENS DetectionIEEE Transactions on Power Electronics, 2005
- Implementation and Test of an Online Embedded Grid Impedance Estimation Technique for PV InvertersIEEE Transactions on Industrial Electronics, 2005
- Automatic phase-shift method for islanding detection of grid-connected photovoltaic invertersIEEE Transactions on Energy Conversion, 2003