Abstract
Hierarchical automatic voltage control (AVC), which enables a secure and economic grid operation, has attracted a lot of global interest. This paper presents a novel control algorithm to address the wide-area AVC problem in modern power grids. The proposed approach is based on the recent advanced wide-area measurement system (WAMS) technologies. It aims to provide a reliable and effective coordinated voltage regulation (CVR) to support system security and avoid voltage fluctuation. An improved CVR model which can consider voltage stability margin (VSM) is proposed, in which a global indicator L is chosen as the constraint for the quantitative voltage stability index. An efficient iterative solving algorithm combining sequential linear programming (SLP) with fast-decoupled iteration is developed to solve the nonlinear optimization model. The new approach is capable of providing an effective voltage regulation over system reactive power sources. The efficacy of the proposed control strategy is validated by extensive simulation studies on several IEEE benchmark systems. The results demonstrate the superior system voltage profile/stability control performance of the proposed approach.
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