Fdbk variables and addressing

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Fdbk variables and addressing

  1. 1. g GE Power Systems EX2000 Feedback Variables and Addressing Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  2. 2. g GE Power Systems Objectives • To understand what feedback signals are used by the EX2000. • The analog to digital conversions and scaling of the feedback signals. • Where the EX2000 stores the “variable” feedback signals. • How to display any variable signal on the EX2000 programmer. • Where to locate the list of EX2000 variables. Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  3. 3. g GE Power Systems Objectives • To understand Per Unit (PU) analog and feedback counts • Understand the terminology COUNTS. Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  4. 4. g GE Power Systems EX2000 Feedback Signals Generator Field Digital Exciter DC Field Amps DC Field Volts AC Stator Amps AC Stator Volts D A Control Core D PCM A AC Bridge Feedback AC Input What are the feedback signals for the EX2000? Revision Date: 02/10/2000 TB8-01 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  5. 5. g GE Power Systems EX2000 Feedback Signals Generator Field Digital Exciter DC Field Amps DC Field Volts AC Stator Amps AC Stator Volts D A Control Core D PCM A AC Bridge Feedback AC Input Why does the Control Core need these inputs? Revision Date: 02/10/2000 TB8-01 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  6. 6. g GE Power Systems EX2000 Feedback Signals • DC Field Amps: Used for OEL. • DC Field Volts: Actual field reference voltage. • AC Stator Amps: Used to calculate the generator operating point. • AC Stator Volts: V/Hz calculations • AC Bridge Feedback: Used for synchronizing the gate firing voltages. Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  7. 7. g GE Power Systems Analog to Digital Conversions Generator Field Digital Exciter D A Control Core D PCM A AC terminal voltage is converted from an analog signal to a digital one. AC Input Revision Date: 02/10/2000 TB8-01 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  8. 8. g GE Power Systems Analog to Digital Conversions Generator Field Digital Exciter D A Control Core AC Stator Volts D PCM A 1 PU = 20,000 counts Once the analog value is converted to a digital signal, the Control Core finds this value a “home”. Revision Date: 02/10/2000 TB8-01 AC Input Property of Power Systems University- Proprietary Information for Training Purposes Only!
  9. 9. g GE Power Systems Analog to Digital Conversions Generator Field Digital Exciter D A Control Core AC Stator Volts D PCM A 1 PU = 20,000 counts The “home” for AC Stator Volts is called VAR.1150. VAR represents “variable” because the unit is always changing. Revision Date: 02/10/2000 TB8-01 AC Input Property of Power Systems University- Proprietary Information for Training Purposes Only!
  10. 10. g GE Power Systems EX2000 Feedback Signals Generator Field Digital Exciter D A Control Core D PCM A VAR.1015: ____________ 1 PU Counts __________ VAR.1013: ____________ 1 PU Counts __________ AC Input VAR.1151: ____________ 1 PU Counts __________ VAR.1150: ____________ 1 PU Counts __________ Revision Date: 02/10/2000 TB8-01 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  11. 11. g GE Power Systems Analog to Digital Conversions 5000 VAR.1015: ____________ 1 PU Counts __________ DC Field Amps 20,000 VAR.1013: ____________ 1 PU Counts __________ DC Field Volts AC Stator Amps 5000 VAR.1151: ____________ 1 PU Counts __________ AC Stator Volts 20,000 VAR.1150: ____________ 1 PU Counts __________ * 1 PU Counts at Rated Conditions Revision Date: 02/10/2000 TB8-01 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  12. 12. g GE Power Systems Conversion Exercise What would be found in addresses VAR.1151, VAR.1150, VAR.1015, and VAR.1013 if your generator was operating at 75% load? VAR.1151: 3750 Counts VAR.1150: 15,000 Counts VAR.1015: 3750 Counts VAR.1013: 15,000 Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  13. 13. g GE Power Systems Conversion Exercise What would be the real measured values (amps, volts, etc.) that correspond to these digital counts? Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!
  14. 14. g GE Power Systems Revision Date: 02/10/2000 TB8-02 Property of Power Systems University- Proprietary Information for Training Purposes Only!

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