Super-twisting sliding mode control for unified power flow controller in power systems

In this paper, robust stabilizing controllers for the synchronous generator speed, series power flows, voltage magnitude and DC link voltage are designed for a power system with FACTS device (UPFC). To design these controllers, a combined super-twisting sliding mode (SM) and block control (BC) technique is implemented. The block control approach is used to design linear and nonlinear sliding manifolds with desired motions. Super-twisting SM control is applied to reject perturbations and avoid the chattering effect. The effectiveness of the proposed algorithm is illustrated by means of simulations.