This category depends on selecting the Unit Power Table method (see “Unit Power Table”), although in the future it might be enabled for other power methods. The frequency regulation methods model the provision of the frequency regulation ancillary service, that is, how the reservoir can be made available to flexibly follow a load demand within a specified range during a certain period in order to affect the frequency of the generated power.

This is the default, no action method; no regulation is modeled.

When frequency regulation is scheduled, it allows the unit to follow the real time load. Exactly what will happen in real time is unknowable. This results in two sets of values at scheduling time, nominally scheduled power and turbine release. It is uncertain if the real time operators will actually use the service. At present, we distinguish between the nominal scheduled power (and turbine release) that the regulation is allowed to depart from and the expected power generation (and turbine release) that will take place when regulation is allowed. Both are important. The scheduled power sets the baseline for regulation and should be communicated to the power dispatchers. The expected power and release are more useful for coordinating a plant with the rest of the system.

See “Unit-level Constraints” for descriptions of added constraints.

See “Unit Frequency Regulation” in Objects and Methods for slot descriptions.