Based on hybrid algorithm of micro-grid islanding detection

Micro-grids are being developed as a building block for future smart grid system. Islanding detection is a great challenge in connecting distributed generation (DG) in electrical power systems. Islanding detection methods are categorized into three groups, i.e., communication based methods, active, and passive methods. Communication based methods are established upon communication between utilities and DGs and have the inconvenience of being expensive and are limited in use. Active methods perturb the system with a disturbance and the system response to the disturbance is analyzed. This paper proposes a hybrid islanding detection method which uses voltage unbalance (VU) and high-frequency (HF) impedance. The proposed method merges the advantages of both active and passive techniques. In addition, since the active method used in this paper does not change any of the system variables as a disturbance, it will not lead to any instability.

[1]  L.A.C. Lopes,et al.  Performance assessment of active frequency drifting islanding detection methods , 2006, IEEE Transactions on Energy Conversion.

[2]  Jan T. Bialasiewicz,et al.  Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey , 2006, IEEE Transactions on Industrial Electronics.

[3]  F. Blaabjerg,et al.  Online grid impedance measurement suitable for multiple PV inverters running in parallel , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[4]  Miles A Redfern,et al.  Protection against loss of utility grid supply for a dispersed storage and generation unit , 1993 .

[5]  Benjamin Kroposki,et al.  Advanced Power Electronic Interfaces for Distributed Energy Systems Part 1: Systems and Topologies , 2008 .

[6]  R. Iravani,et al.  Negative-Sequence Current Injection for Fast Islanding Detection of a Distributed Resource Unit , 2008, IEEE Transactions on Power Electronics.

[7]  Zhe Chen,et al.  A hybrid islanding detection technique using average rate of voltage change and real power shift , 2009, 2009 IEEE Power & Energy Society General Meeting.

[8]  P. Garcia,et al.  Active Islanding Detection Using High-Frequency Signal Injection , 2012, IEEE Transactions on Industry Applications.

[9]  Bill Rose,et al.  Microgrids , 2018, Smart Grids.

[10]  Remus Teodorescu,et al.  ENS Detection Algorithm and Its Implementation for PV Inverters , 2006 .

[11]  Roberto Petrella,et al.  Advances on inter-harmonic variable-frequency injection-based grid-impedance estimation methods suitable for PV inverters , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[12]  P.W. Lehn,et al.  Micro-grid autonomous operation during and subsequent to islanding process , 2005, IEEE Transactions on Power Delivery.

[13]  Marco Liserre,et al.  Grid Converters for Photovoltaic and Wind Power Systems , 2011 .

[14]  Sung-Il Jang,et al.  An islanding detection method for distributed generations using voltage unbalance and total harmonic distortion of current , 2004, IEEE Transactions on Power Delivery.

[15]  Hyemi Hwang,et al.  A Robust Anti-islanding Method for Grid-Connected Photovoltaic Inverter , 2006, 2006 IEEE 4th World Conference on Photovoltaic Energy Conference.

[16]  W. Bower,et al.  Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems , 2002 .