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Primary Frequency Control

Primary Frequency Control. Free Governor Mode of Operation. Boiler-Turbine-Generator System. Units with different Ratings and Same Governor Droop of 3%. Governor Regulation with different ratings and different droop constants. Two Units : Same Rating, same droop.

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Primary Frequency Control

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  1. Primary Frequency Control Free Governor Mode of Operation

  2. Boiler-Turbine-Generator System

  3. Units with different Ratings and Same Governor Droop of 3%

  4. Governor Regulation with different ratings and different droop constants

  5. Two Units : Same Rating, same droop

  6. Two Units : Different Ratings, Same droop

  7. Two Units : Same Rating, Different Droops

  8. Three Units : One unit Regulating

  9. Three Units: Two Units Regulating

  10. The increase in load of a unit with P1 MW Rating and R1%droop is P1 (P1 / R1 ) P1 = K (P1 / R1 ) Similarly P2 (P2 / R 2 ) , P2 = K (P2 / R 2 ) Total load change = P1 + P2 = 100MW P = 100 MW = P1 + P2 = =100MW = Two machines of capacity 200MW with 6% Governor droop and 500MW with 3% Governor droop are operating in parallel with 150MW and 300MW loads to meet a total demand of 450MW at 50Hz in an isolated system. If the total load increases by 100MW to 550MW, what is the resultant load shared by each unit and the resultant frequency of the system.

  11. Example contd.

  12. FGMO in Integrated Systems: Two Units - Shifting Load by changing the Reference System

  13. FGMO in Integrated System: Droop Characteristic showing Load Limit Less than Full Load

  14. Governor Action in an Integrated System

  15. Governor Response to Sudden Loss of Generation

  16. Governor Response:

  17. Boiler-Turbine-Generator System

  18. Temporary Increase in Droop Due to Boiler Effects

  19. Response Characteristics for Boiler-Turbine-Generator Control Systems

  20. Bibliography 1. Cohn, N.. Controlof Generation and Power Flow on Interconnected Systems, WHey, New York, 1961. 2. Miller, II.. Power System Operation. McGraw-Hill, New York1970. 3. Weedy, B., Electric Power Systems, Wiley, New York. 1967. 4. Woodward Governor Co., “Role of Governors in System Operated Unified Control of Hydro Units, Prime Mover Control”

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