Fault Handling Methods and Comparison for Different DC Breaker Topologies and MMC Topologies of the HVDC System

Figure 7

Structure and working process of clamp-double MMC. (a) Both capacitors are inserted. (b) One of the capacitors is inserted. (c) SM is bypassed. (d) All IGBTs are blocked.

(a)

(b)

(c)

(d)