Control Algorithm for a Static Phase Shifting Transformer to Enhance Transient and Dynamic Stability of Large Power Systems

A robust control algorithm for the control of a static phase shifting or quadrature boost transformer has been developed and tested. This algorithm utilizes the inherent stabilizing ability of a phase shifter to rapidly return the power system to a stable operating point following severe transients. Under normal operating conditions, the controller minimizes power flow deviations and slip fluctuations due to random power demand changes. The control commands are generated using only local measurements (voltage and complex power at the transformer), specified power flow, and imprecise values of equivalent impedances of the power system.