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sboctrl

It is one of the few products that is available to everyone. And frankly one of best deliverables from all EPRI programs. Period.
The reference frequency is interconnection wide. To bring a three phase ac generator online the terminal voltage, phase rotation, frequency, and phase angle must be within some tolerance.
The EPRI Power System Dynamics tutorial is a free resource that is really solid https://www.epri.com/#/pages/product/1016042/?lang=en-US.