Co-ordinated nonlinear control of TCSC and SVC in power systems

This paper presents a co-ordinated control strategy, based on the disturbances auto-rejection control (DARC) theory, for the control of thyristor controlled series compensators (TCSCs) and static VAr compensators (SVCs) to improve the power angle and voltage stability of power systems. This novel co-ordinated nonlinear controller possesses a simple structure and performs as an adaptive, robust control scheme without requiring precise information of the power system. The controller can be easily designed and practically implemented and it automatically rejects system disturbances under a wide range of operation conditions. A simulation study based on nine-machine and forty-one-bus power system shows that the co-ordinated control can provide satisfactory control performance and improve power system stability greatly