Investigation of Two Vector Control Based Methods for Static Synchronous Series Compensator

In this paper, two vector control systems for investigating the performance of static synchronous series compensators (sssc) in steady state conditions are presented that are based on famous d-q axis theory. the workability of proposed method to simplify the sssc mathematical expressions is shown. the performance of sssc with two different vector controllers, first based on d-q line currents(indirect control) and the second a heuristic vector control based on real and reactive line powers (direct control), are investigated through simulation. it is found that the new introduced direct control produces better performance in controlling ac power system. finally the simulation results of an elementary two-machine system with sssc in different cases are investigated