Search

This paper presents the coordinated design of multiple FACTS supplementary damping controllers to improve system small-signal stability. A BMI-based multi-objective multi-model system approach is formulated to solve the robust damping control problem. Two-step method is proposed to determine controller variables. Regional pole placement and control effort optimization are set as the control objectives. An SVC and a TCSC damping controller are designed sequentially with minimized decoupling effort. Selection of the feedback signals for the FACTS damping controllers is realized by evaluating the modal residues of each feedback signal to the system input. To cover multiple inter-area oscillation modes, wide-area decentralized control methodology is proposed and remote feedback signals are selected. Real-time simulation is carried out on real-time digital simulator (RTDS) to test the performance of the proposed controller. The results show that the FACTS damping controllers are feasible and able to increase system damping to a satisfactory level under different system operating points. [ABSTRACT FROM PUBLISHER]

This paper presents the robust damping control of power systems with thyristor-controlled series compensator (TCSC). A SISO output feedback controller is to be designed for TCSC to improve the damping of inter-area oscillations under multiple operating points. The robust damping control problem is formulated as a multi-objective optimization problem considering both regional pole placement and H2 performance for multi-model system. The multi-objective criterions are described by a set of bilinear matrix inequalities (BMI) regarding different system models at multiple operating points; then, a two-step method is introduced to solve the BMI optimization problem via linear matrix inequality (LMI) algorithm. The proposed controller is evaluated by simulations on real-time digital simulator (RTDS). Numerical results from the simulations show that the proposed controller can increase the damping of inter-area oscillations under different system operating conditions. [ABSTRACT FROM PUBLISHER]