Islanding Detection in Microgrids Using Harmonic Signatures

In recent years, there has been a growing interest in incorporating microgrids in electrical power networks. This is due to various advantages they present, particularly the possibility of working in either autonomous mode or grid connected, which makes them highly versatile structures for incorporating intermittent generation and energy storage. However, they pose safety issues in being able to support a local island in case of utility disconnection. Thus, in the event of an unintentional island situation, they should be able to detect the loss of mains and disconnect for self-protection and safety reasons. Most of the anti-islanding schemes are implemented within control of single generation devices, such as dc-ac inverters used with solar electric systems being incompatible with the concept of microgrids due to the variety and multiplicity of sources within the microgrid. In this paper, a passive islanding detection method based on the change of the 5th harmonic voltage magnitude at the point of common coupling between grid-connected and islanded modes of operation is presented. Hardware test results from the application of this approach to a laboratory scale microgrid are shown. The experimental results demonstrate the validity of the proposed method, in meeting the requirements of IEEE 1547 standards.

[1]  J.F.G. Cobben,et al.  Power quality aspects of a future micro grid , 2005, 2005 International Conference on Future Power Systems.

[2]  M. Liserre,et al.  Overview of Anti-Islanding Algorithms for PV Systems. Part I: Passive Methods , 2006, 2006 12th International Power Electronics and Motion Control Conference.

[3]  Weidong Xiao,et al.  Allowable DG penetration level considering harmonic distortions , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[4]  Xiaohuan. Wang,et al.  Non-devastating islanding detection for micro-grid based on mathematical statistics , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[5]  Xinchun Lin,et al.  Improved SMS islanding detection method for grid-connected converters , 2010 .

[6]  D. J. Pileggi,et al.  Harmonics trend in NE USA: a preliminary survey , 1999 .

[7]  Saad Mekhilef,et al.  Hybrid anti-islanding algorithm for utility interconnection of distributed generation , 2009, 2009 International Conference for Technical Postgraduates (TECHPOS).

[8]  Magdy M. A. Salama,et al.  Impact of Load Frequency Dependence on the NDZ and Performance of the SFS Islanding Detection Method , 2011, IEEE Transactions on Industrial Electronics.

[9]  S. R. Samantaray,et al.  Assessment of ROCPAD Relay for Islanding Detection in Distributed Generation , 2011, IEEE Transactions on Smart Grid.

[10]  Fang Zhuo,et al.  Calculation and measurement of harmonic impedance for a microgrid operating in Islanding mode , 2012, Proceedings of The 7th International Power Electronics and Motion Control Conference.

[11]  Stephen J. Finney,et al.  Harmonic distortion-based island detection technique for inverter-based distributed generation , 2009 .

[12]  Walid G. Morsi,et al.  Passive method-based islanding detection of Renewable-based Distributed Generation: The issues , 2010, 2010 IEEE Electrical Power & Energy Conference.

[13]  B. Singam,et al.  Assessing SMS and PJD Schemes of Anti-Islanding with Varying Quality Factor , 2006, 2006 IEEE International Power and Energy Conference.

[14]  Gabriel Garcera,et al.  An Active Anti-Islanding Method Based on Phase-PLL Perturbation , 2011, IEEE Transactions on Power Electronics.

[15]  H.K. Karegar,et al.  Islanding detection of wind farms by THD , 2008, 2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies.

[16]  Yu Zhang,et al.  Investigation of active islanding detection methods in multiple grid-connected converters , 2009, 2009 IEEE 6th International Power Electronics and Motion Control Conference.

[17]  B. Mozafari,et al.  A novel SVM approach of islanding detection in micro grid , 2012, IEEE PES Innovative Smart Grid Technologies.

[18]  Zhe Chen,et al.  Review of islanding detection methods for distributed generation , 2008, 2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies.

[19]  John A. Orr,et al.  A survey of harmonic voltages and currents at the customer's bus , 1993 .

[20]  Yu Zhang,et al.  Evaluation of anti-islanding schemes based on nondetection zone concept , 2004, IEEE Transactions on Power Electronics.

[21]  A. Kahrobaeian,et al.  Interactive Distributed Generation Interface for Flexible Micro-Grid Operation in Smart Distribution Systems , 2012, IEEE Transactions on Sustainable Energy.

[22]  David Reigosa,et al.  Active islanding detection using high frequency signal injection , 2012, 2011 IEEE Energy Conversion Congress and Exposition.

[23]  John A. Orr,et al.  A survey of harmonic voltages and currents at distribution substations , 1991 .

[24]  Rui Sun,et al.  Power system islanding detection & identification using topology approach and decision tree , 2011, 2011 IEEE Power and Energy Society General Meeting.

[25]  Mohammad A. S. Masoum,et al.  Power Quality in Power Systems and Electrical Machines , 2008 .

[26]  Frede Blaabjerg,et al.  Accurate and Less-Disturbing Active Antiislanding Method Based on PLL for Grid-Connected Converters , 2010, IEEE Transactions on Power Electronics.

[27]  Jun Li,et al.  A Centralized Injection Method for Islanding Detection in Micro-Grids , 2012, 2012 Asia-Pacific Power and Energy Engineering Conference.

[28]  G. B. Gharehpetian,et al.  Passive anti-islanding scheme based on reactive power in the smart grids , 2012, Iranian Conference on Smart Grids.

[29]  W.L. Kling,et al.  Harmonic current pollution in a low voltage network , 2010, IEEE PES General Meeting.

[30]  Michèle De Witte,et al.  Power quality monitoring in Belgian distribution networks , 2005 .

[31]  Mongkol Konghirun,et al.  An anti-islanding for multiple photovoltaic inverters using harmonic current injections , 2012, 2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology.

[32]  Li Jun,et al.  Two islanding detection circuits based on the impedance variation for the micro-grid , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[33]  R. Iravani,et al.  Current injection for active islanding detection of electronically-interfaced distributed resources , 2006, IEEE Transactions on Power Delivery.

[34]  N. Perera,et al.  Investigation of a fast islanding detection methodology using transient signals , 2009, 2009 IEEE Power & Energy Society General Meeting.

[35]  Yong-Cheol Kang,et al.  Islanding detection for a micro-grid based on the active and reactive power in the time domain , 2011, 2011 International Conference on Advanced Power System Automation and Protection.

[36]  Yongzheng Zhang,et al.  Islanding Detection Assessment of Multi-Inverter Systems With Active Frequency Drifting Methods , 2008, IEEE Transactions on Power Delivery.