Robust synchronous voltage sources designed controller for power system oscillation damping
The advanced static Var compensator (ASVC), also known as STATCON, has a superior inherent characteristic to the SVC in providing voltage support and in damping power system oscillations. However, it is known that the ASVC system for damping control may suffer from unstable zeroes or a pair of complex zeroes on the imaginary axis, and also parameter uncertainty which can degrade the control performance. To cope with these problems, this paper proposes an improved robust H?-ASVC controller for increasing the robustness as well as the dynamic performance of the power system, where the bilinear transform is combined with the standard H?-approach. Uncertainties in a system model, such as modeling errors coming from a model reduction, linearization, change in operating conditions are successfully taken into consideration at the design stage of controller. The time delay uncertainty in the input signal of the controller is effectively treated. It is demonstrated that the new control system increases the performance and robustness of a power system under a wide range of operating conditions.
asvc statcon power system stability h?-optimal control robust control