7808 — Power Plant Control
Duration: 4.0 Hour(s)
The objective of this module is to present and discuss the factors involved in power plant control, including:
- Adjustment of active power and reactive power output.
- Adjustment of the primer mover and auxiliary systems to meet the power output requirement.
- Types of plant automatic control systems.
On completion of this module, the participant will be able to understand and describe the following concepts, and include them in day-to-day work practices.
- Power system load variations.
- The need for total generating plant output to equal power system load demand plus losses.
- The effect of changes in load demand on system frequency.
- The utilization of speed (frequency) variations to initiate governor response.
- The load dispatcherâ€™s task.
- Adjustment of governorâ€™s set-points to control unit output.
- The effect of system overload and load rejection.
- The demand for reactive power (VARs) by consumers electro-magnetic devices.
- Production of reactive power in the generator (by adjustment of field excitation).
- The effect of increasing excitation current on:
- Active power output (MW).
- Reactive power output (MVAR).
- Terminal voltage.
- Stator current and consequent stator heating.
- Vector relationship between megawatts and megavars.
- Calculation of megavolt-amperes (MVA).
- Power factor.
- The need for sophisticated control systems to continuously adjust the steam turbine, boiler, and auxiliary equipment to meet the power output requirements of the generator.
- Modes of master control.
- The basic control loop and major components.
- Pneumatic control systems.
- Transmission of sensing signals and control signals.
- Delay due to inertia of the control air system.
- Space limitations on pneumatic control boards.
- Electronic control signals.
- Digital control systems.
- Main CPU installation.
- DCS â€“ Distributed Control Systems.
- Multiple processors.
- The application of PLCs.
- The digital operator interface.
- Advantages of the digital control system.