Dynamic Characteristic Analysis of SSSC Based on the Multibridge Inverter

This paper proposes a static synchronous series compensator based on the multibridge inverter. The proposed system consists of six H-bridge modules per phase, which generate 13 pulses for each half period of power frequency. The dynamic characteristic was analyzed by simulations with electro-magnetic transients program (EMTP) code, assuming that it is inserted in the 154-kV transmission line of a one-machine-infinite-bus power system. The feasibility of hardware implementation was verified through experimental works using a scaled model. The proposed system does not require a coupling transformer for voltage injection, and has flexibility in expanding the operation voltage by increasing the number of H-bridge modules.