Optimal robust control design of static VAr compensators

The paper presents a comprehensive robust control design procedure for static VAr compensators (SVCs). Variations of system operation conditions are represented by an unstructured uncertainty model. Structured singular value optimisation together with model reduction techniques are used to design a low order controller which provides fast and stable voltage regulation under all system conditions. To demonstrate its effectiveness, the proposed design procedure is successfully applied to a weak radial system with multiple SVCs