Abstract
In this paper, we propose a combined control strategy which is designed to improve the post-contingency loadability limits in the system. In the first step, the operating point is determined using a contingency constrained optimal reactive power flow, in which the cost function reflects the proximity of the reactive power generation to its limits at critical PV buses, both in the base case and for selected contingencies. This operating point is then used to design robust decentralized turbine/governor control, in the framework of linear matrix inequalities. Results obtained for the IEEE 39 bus system are provided to demonstrate the effectiveness of the proposed method.
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