G301 – Generator Control Concepts

G301 – Generator Control Concepts

3 days - 21 PDH Credits Awarded



There are NO SMALL PROBLEMS when it comes to your GENERATOR!!  Be prepared.  Make sure you fully understand Design, Construction, Operations, and how /why the controls function as they do.  Don't be surprised.  Be prepared.  Register for this course today.  We begin with the big-picture, proceed with component identification (including how these components may be of risk in abnormal conditions), discussion of normal/abnormal operations, and how the generator controls should respond to these conditions.  This course is designed for plant engineers who have a specific need to better understand how the generator controls function.  Plant electrical and operations technicians benefit as well. Topics include: Generator Theory • System Operation • Generator Construction • Exciters • Voltage Regulators • Speed Controls • Generator Protection • Industry Events
  • How does a generator function?
  • Why is it designed as it is?
  • What happens if the generator is synchronized out-of-phase? What might be the cause and what is the effect?
  • Just how bad (and what is) negative phase sequence currents?
  • Why have we (recently) heard of hydrogen explosions? How do we avoid?
  • ...And the list of answered questions goes on!!


Upon completion of this course, participants will be able to:
  1. Describe how a generator functions. (Learn why and how the voltage drops with an application of a load and learn why and how the rotor speed and angle change as that load is applied).
  2. Describe active and reactive power. (Learn how active power is generated, how reactive power is generated, and how these loads are shared from one generator to another.)
  3. Describe the major components used in the construction of an AC generator.
  4. Learn how these components are at risk during mis- or abnormal operations.
  5. Explain operation and maintenance of the most common excitation systems.
  6. Explain how a speed governor alters generator output in response to a frequency deviation. (Learn why the speed changes when a load is applied. Learn what is the role of the governor is response to this speed/frequency change).
  7. Explain how the voltage regulator alters generator output in response to a voltage deviation. (Furthermore, learn why the voltage drops, how a voltage drop is detected, where it is detected, and how the voltage regulator responds as it does).
  8. Discuss the causes and effects of both voltage and frequency oscillations and the impact they each have on power system dynamics.
  9. Describe generator normal/safe startup and shutdown procedures.
  10. Describe why the generator synchronizing process is as it is. (Learn what are the results of not checking phase rotation, of mismatching voltages, of mismatching frequencies, and closing the circuit breaker out-of-phase.)
  11. Discuss abnormal generator operation and recommended actions for generator protection.
  12. Given an unfortunate abnormal condition, describe possible results to equipment and/or system.

Course Dates / Location / Fee

See www.TurbineGeneratorTraining.com for detail on the course dates / locations / and registration fees. HPC’s 3-4-2 policy applies:  Sign up 3 for the same course/date, pay in advance, and pay for only 2 (the 3rd participant is free)! HPC Technical Services reserves the right to cancel any course/seminar within 10-working days of the scheduled date.  Fees are 100% refunded or credited to another Seminar (clients' choice) if HPC should cancel any Seminar.  HPC is not responsible for non-refundable airline tickets or other travel expenses under any circumstance.

Course Synopsis


  • Generator Theory: Armature Reaction, Resistive Loads, Inductive Loads, Capacitive Loads, Power Transfer and Load Angle, Reactive Power, Net Air Gap, Developed Torque, Watt and VAR Control, Generator Capability, Stator Winding Heating, Field Heating, Core End Iron Heating, Power System, Power Transfer Between Generator Rotor and Stator, Short Circuit Ratio
  • System Operations:  Structure of the Power System, Interconnections, Power Balance, Operation of the System, State of the Power System.


  • Generator Construction: Stator Frame, Core, Windings, End Shield, Rotor Body, Field Windings, Retaining Rings, Collector Rings, Diesel and Hydroelectric Differences
  • Excitation Systems, Voltage & Frequency Control: Speed Governor Response to Frequency Deviations, Automatic Voltage Regulator Response to Voltage Deviations, Manual Regulator, URAL, Impedance Compensator, Volts/Hertz, Maximum Excitation Limit, Transfer & Tracking, PSS, De-Excitation, Steady State Operation, Transient Conditions, Earlier Excitation Systems, Rotating AC Exciters, Alterrex, SCRs, Brushless Excitation Systems, Static Excitation Systems, SCPT, SCT-PPT, Bus Fed Exciters
  • Generator Auxiliary Systems:  Purpose and Operations of the Generator Hydrogen Control System, Generator Seal Oil System, and Stator Liquid Cooling System (as required).


  • Normal Operations: Preparation for Start-Up, Synchronizing, Load Changes, Use of Reactive Capability Curve, Shutdown.
  • Abnormal Operations:  Relationships Between Operations, Protection and Alarms; Alarms, Protection when Off-Line, Tripping Methods, Protective Actions for Generator Faults and Abnormal Operations & Protection Recommendations: System Steady & Dynamic Conditions, Frequency Deviations, Voltage Deviations, Instabilities, Loss of Synchronism, Stator Overcurrent, Field Ground, Stator Ground Fault, Stator Phase-to-Phase Fault, Over Voltage, Over Volts-per-Hertz, Field Overheating, Loss of Excitation, Bearing Vibration, Synchronizing Errors, Motoring, Seal Oil System Pressure, Stator Coolant System, Local Overheating, Unbalanced Armature Currents, Breaker Failures, System Back Up, Voltage Surges, Transmission Line Planned Switching, High Speed Reclosing, Accidental Energization
Please be advised that this course is the first three days of a five day class, G401, Utility Generators which includes generator maintenance and testing.


All HPC instructors are educated ‘experts’ on the subjects they teach, with years of relevant hands-on experience (typically 20+ years), and have proven instructional skills. Brief resumes can be looked up on HPC’s website, www.TurbineGeneratorTraining.com.

Frequently Asked Questions

  • Will HPC Technical Services bring this course to our location for our personnel only? YES, call or email Stephen Parker, Stephen@TurbineGeneratorTraining.com for a price quotation.
  • Will HPC Technical Services customize the presentation at our site to suit our particular needs?
  • Is HPC Technical Services' textbook available for purchase as a reference document?   $195 + S&H.
  • What is the cost for HPC Technical Service to deliver this course at our location? Well, of course that can vary, but generally speaking, if you're planning on having 6+ attend, when considering your T&L, it is to your advantage to perform the course at your plant (office).  You gain from the customization and price.
  • Can HPC Technical Services provide "Technical Assistance" in the troubleshooting generator related issues? Yes we can.  Call or contact Stephen Parker, Stephen@TurbineGeneratorTraining.com for our rate sheets and any further information required.

What you will receive

  1. 1 copy of HPC Technical Services' textbook, Generator Control Concepts, a $195 value, as written by Harold Parker,with considerable support from AGT Services, National Electric Coil and several independent consultants. This text contains a significant number of equipment photographs, graphics and data tables.  It is a valuable desktop reference in addition to being able to enhance the learning process.  This valuable text is available for purchase if you cannot attend.
  2. A Certificate of Completion with 21 PDH