Optimal allocation of AC-DC capacity considering cascading failure risk of AC-DC parallel power system

There are few studies both considering the two aspects of cascading failure risk (CFR) and AC/DC capacity optimal allocation, so the problem of AC/DC capacity optimal allocation considering CFR is studied. The mathematical model of the AC/DC capacity optimal allocation problem is provided, the cascading failure Monte-Carlo simulation algorithm and the AC/DC capacity optimal allocation implicit enumeration algorithm are proposed. Simulation based on the modified IEEE39 system is performed, in which the AC/DC capacity optimal allocation which has the smallest CFR is obtained and the impact of various factors are also analyzed. The results reflect that there exists an optimal AC/DC capacity allocation with a balanced ratio, and it can be quantitatively calculated applying the proposed method.