Stability Modeling and Comparative Study of Series Vectorial Compensators

Abstract

Complete stability analyses, including voltage, small perturbation and transient stability studies, and the associated models and controls of a series vectorial compensator (SVeC) are presented in this paper. It is also shown through detailed simulations that the SVeC is a competitive device against series power-flow controllers and it might be a better option for similar purposes where space and costs are at premium. Hence, a full comparative evaluation of this controller with respect to controllers used mainly for oscillation control in transmission corridors, namely, thyristor-controlled series capacitors (TCSC) and series static synchronous compensators (SSSC), is also presented for the first time. The IEEE 14-bus benchmark system and a 190-bus, 46-machine model of the Mexican grid are used for illustrative and comparison purposes. The results obtained show that the SVeC has better oscillation damping characteristics than the TCSC and SSSC, hence making these types of controllers a competitive alternative against existing series flexible ac transmission system (FACTS) controllers for dynamic series compensation of transmission lines.