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Table 6 Comparative analysis of conventional DOCR [20] and dual setting DOCR for 7-bus microgrid system

From: Coordination of dual setting overcurrent relays in microgrid with optimally determined relay characteristics for dual operating modes

Operating mode

Relay characteristics

Conventional DOCR operating time (s) using GA [20]

Dual DOCR operating time (s) using GA

Conventional DOCR operating time (s) using GWO

Dual DOCR operating time (s) using GWO

Reduction in total relay operating time using GA

Reduction in total relay operating time using GWO

Grid-connected

NI

7.2041

3.3877

7.2453

3.4045

52.97%

53.01%

 

VI

2.4392

1.6825

2.5482

1.7402

31.02%

31.70%

 

EI

1.6681

1.6124

1.7053

1.6139

3.39%

5.35%

 

Mixed

1.6684

1.6065

1.6868

1.6103

3.71%

4.53%

Islanded

NI

7.3148

3.9882

7.4868

3.9918

45.47%

46.68%

 

VI

3.2457

1.7765

3.3625

1.7885

45.26%

46.81%

 

EI

6.7142

1.6928

2.0911

1.7258

74.78%

17.46

 

Mixed

2.0670

1.6345

2.0888

1.6459

20.92%

21.20%