Robust pole placement technique for STATCOM controller design

This paper presents a new method of a voltage controller design for the synchronous static compensator (STACOM). The required performance of the STATCOM is achieved by a robust closed-loop pole placement in a pre-specified region of the complex plane. For this purpose, some ideas from a field of linear matrix inequalities (LMIs) are combined with a zero set concept. The initial state-feedback controller that satisfies the design specifications is obtained solving linear matrix inequalities whereas a complete set of the admissible controller gains is found using zero set calculations. At the final stage, design centering is performed to derive a robust STATCOM voltage controller with maximally possible safety margins.