Comparative study on system transient stability using Cascade STATCOM and SVC

Induction motor load will absorb more reactive power during power system fault, and large scale interconnected power system will front transient instability due to the lack of adequate dynamic VAR supporting. This paper focuses on a detailed discussion of the induction motor load as it pertains to voltage stability studies. Meanwhile, a comparative study on the transient support ability of SVC and Cascade STATCOM has been made, and the main factors influencing the ability have also been in-depth discussed. The system simulation model is built in the MATLAB/Simulink environment using the PSB, and the results indicate that the Cascaded STATCOM has better transient support ability than SVC during power system fault, and validate that the instantaneous current single-phase control strategy can ensure Cascade STATCOM continuously operating even under asymmetric fault without over-currents.