Fault-Tolerant Power Electronic System for Drag Power Kites

Figure 11

Equivalent circuit diagram of the proposed fuse system and considered faults inside and between two “isolated drivetrains” (a) and (b), where GND is the ground (earth), K is the kite’s frame, I1p# and I1n# are the positive and negative current sources of the power electronic converter(s) on ground closest to the tether, I2# is the current source of the power converter onboard the kite closest to the tether, C# is a (filter) capacitor, R# is a (parasitic) resistance, F# is a fuse, D# is a diode, U# is a UPS voltage source (drawn as battery), short circuit faults are enumerated with S#, and open circuit faults are enumerated with O#.