Active Anti-Islanding technique with reduced Non-Detection Zone for Centralized Inverters

This paper presents an active anti-islanding scheme for grid-tied centralized inverters for large Photovoltaic (PV) power plants. The proposed technique involves appropriate reactive power injection into the grid which results in the positive/negative rate of change of frequency. The proposed algorithm is simple and can be easily integrated into DQ based current control technique. It has a smaller Non-Detection Zone (NDZ) and faster response as compared to other active anti-islanding schemes. As the proposed method is based on alarm generation and confirmation, it does not inject any periodical disturbance into the grid unlike other anti-islanding techniques and thus does not cause any power quality issues. The proposed active anti-islanding algorithm is simulated in MATLAB/SIMULINK under different loading conditions as per IEEE/IEC standards. The algorithm is also experimentally verified on a 25 kW centralized inverter prototype using TMS320F2812 DSP controller. The experimental and simulation results are presented to validate the effectiveness of the algorithm.

[1]  Prashant Jain,et al.  Hybrid Phase Locked Loop for controlling Centralized inverters in large solar Photovoltaic power plants , 2016, 2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES).

[2]  Chern-Lin Chen,et al.  Automatic phase-shift method for islanding detection of grid-connected photovoltaic inverters , 2002 .

[3]  Wilsun Xu,et al.  A Power Line Signaling Based Technique for Anti-Islanding Protection of Distributed Generators—Part I: Scheme and Analysis , 2007, IEEE Transactions on Power Delivery.

[4]  R. Walling,et al.  A new family of active antiislanding schemes based on DQ implementation for grid-connected inverters , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[5]  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.

[6]  Heejun Kim,et al.  An improved method for anti-islanding by reactive power control , 2005, 2005 International Conference on Electrical Machines and Systems.

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

[8]  E.F. El-Saadany,et al.  Safe controlled islanding of inverter based distributed generation , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[9]  Marco Liserre,et al.  Overview of Anti-Islanding Algorithms for PV Systems. Part II: ActiveMethods , 2006, 2006 12th International Power Electronics and Motion Control Conference.

[10]  Frede Blaabjerg,et al.  On-line grid impedance estimation based on harmonic injection for grid-connected PV inverter , 2007, 2007 IEEE International Symposium on Industrial Electronics.

[11]  Zhihong Ye,et al.  Evaluation of anti-islanding schemes based on nondetection zone concept , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[12]  Ajeet Rohatgi,et al.  Determining the relative effectiveness of islanding detection methods using phase criteria and nondetection zones , 2000 .

[13]  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.

[14]  Rui Zhou,et al.  Study and Development of Anti-Islanding Control for Grid-Connected Inverters , 2004 .