Calculation of Available Transfer Capability of Hybrid AC/DC Power System Considering Dynamic Security Constraint

Based on available transfer capacity(ATC) model considering conventional static state security constraint,an ATC model for hybrid AC/DC power system,in which dynamic stability constraint was taken into account,was built.Using a new method for dynamic equivalence,in which the influences of network were considered,the accuracy of equivalence was effectively improved.According to features of post-equivalence hybrid AC/DC power system,an optimal supplementary control strategy for nonlinear DC modulation,in which the influences of non-state variables in power system were effectively taken into account,was designed.The designed strategy could improve dynamic characteristics of the AC/DC power system,meanwhile the interregional ATC of hybrid AC/DC power system could be improved.The rationality of the built model and the effectiveness of the adopted method were verified by simulation results of modified IEEE 30-bus system.