Abstract
This paper presents a novel corrective control strategy that can effectively coordinate distributed and bulk energy storage to relieve post-contingency overloads. Immediately following a contingency, distributed batteries are implemented to provide fast corrective actions to reduce power flows below their short-term emergency ratings. During the long-term period, Pumped Hydro Storage units work in pumping or generation mode to aid conventional generating units keep line flows below the normal ratings. This problem is formulated as a multi-stage Corrective Security-constrained OPF (CSCOPF). An algorithm based on Benders decomposition was proposed to find the optimal base case solution and seek feasible corrective actions to handle all contingencies. Case studies based on a modified RTS-96 system demonstrate the performance and effectiveness of the proposed control strategy.
Highlights
Power systems have been operating in the way that requires the base case operating point can withstand an unexpected loss of components [1]
We focus on the use of different types of energy storage as corrective control resources to remove post-contingency overloads
A novel corrective control strategy that can coordinate distributed and bulk energy storage for relief of post-contingency overloads has been presented in this paper
Summary
Power systems have been operating in the way that requires the base case operating point can withstand an unexpected loss of components [1]. Generation redispatch [3,4,5,6,7,9] is a commonly used corrective action incorporated in the CSCOPF to remedy post-contingency overloads, in which operators send orders to generators to increase/decrease their output in the event that any single generating unit or transmission line suddenly trips This form of corrective action is only effective in the case of post-contingency power flows on lines are lower than their short-term emergency (STE) ratings [10], because most generators cannot adjust their output fast enough to relieve the STE overloads within several min, due to their slow ramp up/down rates [11].
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