Assessment of ROCPAD Relay for Islanding Detection in Distributed Generation

The paper presents a new approach for islanding detection in distributed generation (DG) using rate of change of phase angle difference (ROCPAD). The process starts with retrieving the voltage and current signals at the DG end and estimating the phasors (amplitude, phase, and frequency) using synchronous transformation based algorithm. The next step is to compute the phase angle difference and the ROCPAD for registering islanding detection. The proposed algorithm is compared with the widely used rate of change of frequency relays (ROCOF) and found working effectively in the situations where ROCOF fails. The proposed ROCPAD relay is tested on standard microgrid structures with possible variations in operating parameters and the results indicate that the ROCPAD relay can reliably detect islanding conditions in large microgrids.

[1]  Liuchen Chang,et al.  Recent developments in islanding detection for distributed power generation , 2004, 2004 Large Engineering Systems Conference on Power Engineering (IEEE Cat. No.04EX819).

[2]  Wilsun Xu,et al.  Comparative analysis between ROCOF and vector surge relays for distributed generation applications , 2005, IEEE Transactions on Power Delivery.

[3]  Toshihisa Funabashi,et al.  A review of islanding detection methods for distributed resources , 2003, 2003 IEEE Bologna Power Tech Conference Proceedings,.

[4]  Mark Sumner,et al.  A technique for power supply harmonic impedance estimation using a controlled voltage disturbance , 2002 .

[5]  Miles A Redfern,et al.  A new microprocessor based islanding protection algorithm for dispersed storage and generation units , 1995 .

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

[7]  Wilsun Xu,et al.  A practical method for assessing the effectiveness of vector surge relays for distributed generation applications , 2004, IEEE Transactions on Power Delivery.

[8]  G. Joos,et al.  Intelligent-Based Approach to Islanding Detection in Distributed Generation , 2007, IEEE Transactions on Power Delivery.

[9]  G. Joós,et al.  A Fuzzy Rule-Based Approach for Islanding Detection in Distributed Generation , 2010, IEEE Transactions on Power Delivery.

[10]  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.