Generator issues
Generator issues
(OP)
I have a garbage burning generator that is having load fluctations. The plant has 3 generators, (2) 13.5MW units, and this 25MW unit. The twin 13.5MW units are stable, but the 25MW unit is constantly moving about 1 MW every minute. The 25MW unit swings even if the two 13.5MW units are offline. All 3 generators are, of course connected to the grid, and they all individually sustain their own load (their boiler feed pumps, ID & FD Fans, etc.). The govenor has been completely gone through and has been thought to not be the problem. The problem occurs no matter what mode the unit is in (droop, island, etc.) ANy help would be appreciated.






RE: Generator issues
IN OUR PLANT, WE ENCOUNTER THAT KIND OF SCENARIO YOU HAD.
BUT MAY I KNOW WHAT KIND OF GOVERNOR, SPEED AND LOAD CONTROLLER WERE USED IN YOUR GENERATOR SET? I GUESS YOU USED WOODWARD BRAND AS WE HAD.
AND ALSO PLEASE GAVE ME THE OVERALL SCENARIO: THE SET UP, THE TIME IT FLACTUATES AFTER DELIVERING A LOAD, THE TIME/ LOAD SCHEMES, ETC.
RE: Generator issues
RE: Generator issues
I would also note that this is not a problem the unit can live with for the long term, as it has implications for the mechanical condition of the unit.
RE: Generator issues
you are on the right track but still this is a problem,
since "25MW unit is constantly moving about 1 MW every minute" as it was stated by sjvanhecke.. imagine after 25 minutes the generator is unloaded! or perhaps it will trip due to overspeeding as it abruptly never holds the V/F ratio.
sjvanhecke..
can you give me any history upon maintenance or repair that was done to your 25MW generator? is there any history of governor repair?
RE: Generator issues
RE: Generator issues
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If we learn from our mistakes,
I'm getting a great education!
RE: Generator issues
RE: Generator issues
RE: Generator issues
2-Redue integral action, if PID incorporated.
3-Check MW feed back comming to control, complete loop
4-Service or replace linkage
5-Check total span movement of valve with signal range, calibrate if required. for example signal 4-20mA , opening 0% to 100%. should be linear responce.
Regards,