A Control Strategy for Ground Fault on the AC Side of MMC-HVDC System

Figure 1

Control effect of single-phase ground fault. (a) Three-phase voltage on the fault side. (b) Three-phase current on the fault side. (c) d-axis negative sequence current on the fault side. (d) q-axis negative sequence current on the fault side. (e) Active power on the fault side. (f) Reactive power on the fault side. (g) DC voltage on the rectifier side. (h) Reactive power on the rectifier side.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)