Grid-Tied Hybrid AC-DC Microgrid: Finding Optimal Number of Parallel-Connected AC-DC Bidirectional Interfacing Converters

Table 1

The AC-DC converter components: the failure rates and repair time [15].

Component

Capacitor

IGBT

Diode

Snubber

Filter inductor

Current sensor

Voltage sensor

Gate drive

Cooling system

λtotal

μtotal

FOR

λone

3.03

0.9

0.8

0.001

0.038

0.5

0.56

1

1.36

23.89 (Failures/106 hours) = 0.2093/year

365/24 = 15.2/year

= 0.0136

No.

1

6

6

6

3

3

3

6

1

λNo

λc = 3.03

λIGBT = 5.4

λD = 4.8

λS = 0.006

λLf = 0.114

λI = 1.5

λV = 1.68

λGD = 6

λCS = 1.36