With increased renewable generation integration and the resulting congestion issues within the electric grid, the implementation of a Phase Shifting Transformer (PST) may provide economical solutions to alleviate near-term reliability concerns. While the PST may be feasible for most system conditions, there may be conditions during which system operators will have to limit the contribution of the PST to power flow. Oklahoma Gas and Electric (OG&E) studied the implementation of a PST to address specific congestions issues by evaluating various combinations of generation, transmission and load scenarios as well as PST design parameters. This evaluation revealed boundaries that inform both the specification and operation of the PST in real time. The Power System Simulator for Engineering (PSS/E) software and the Electromagnetic Transient Program (EMTP) software were employed to simulate multiple system conditions and develop operational plans for real time operation of the PST.
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