Regenerative braking
Regenerative braking
(OP)
i am in the process of specifying equipment for a drilling rig on an artificial island. Because of tidal conditions the only available cooling source will be air cooled radiators. To limit the number of radiators and reduce the consequent noise emissions i wish to regenerate the braking power from the hoist equipment drawworks back to the National Grid. The hoist equipment will be driven by 2 x 1100 hp VFD MOTORS WITH 4-QUADRANT DRIVE. i must state here that the island has 2 power supplies, one from the production gas turbine and from the grid both at 6KV - 50hz.
The regenerative power must not feed back to the plant system as this will reduce power from the production gas turbine and interfere with production.
I realise i must have some type of THYRISTOR which will allow the regenerative power to feed to the GRID but not to the plant.
is this feasible and are the controls sophisticated, as i wish to keep the system simple and reliable. Appreciate any input from persons with previous experiece of this set-up.
Regards
Chief
The regenerative power must not feed back to the plant system as this will reduce power from the production gas turbine and interfere with production.
I realise i must have some type of THYRISTOR which will allow the regenerative power to feed to the GRID but not to the plant.
is this feasible and are the controls sophisticated, as i wish to keep the system simple and reliable. Appreciate any input from persons with previous experiece of this set-up.
Regards
Chief





RE: Regenerative braking
RE: Regenerative braking
I'll willing to bet that your drive manufacturer already has a regen brake designed. You should ask about the time differential between a brake chopper and regen braking. Protecting the drive caps, rig floor, and especially personnel must be considered.
RE: Regenerative braking
Regards
Chief
RE: Regenerative braking
Regards
Chief
RE: Regenerative braking
If you want the regenerative power to only go out to the utility grid when your gas turbine is also supplying power there, then the output voltage from the regenerative power must be limited to a value below the gas turbine generator but above the grid voltage.