The excitation system is the heart of a synchronous generator, playing a key role in controlling the terminal voltage, maintaining system stability, and enabling reactive power support. The Hydro Power Project utilizes a Brushless DC Excitation System, which offers several advantages over traditional systems in terms of reliability, maintenance, and electrical isolation.
Brushless Excitation System – Key Highlights:
No Brushes or Slip Rings – A rotating exciter (AC generator) with a stationary field and a rotating armature directly mounted on the same shaft as the main generator.
AC to DC Conversion – The exciter’s AC output is converted to DC using a rotating rectifier assembly, supplying 125V DC excitation voltage to the generator’s rotor windings.
AVR Integration – An Automatic Voltage Regulator (AVR) controls the field current of the exciter based on system demand, ensuring voltage stability under varying load conditions.
Advantages:
Reduced maintenance (no carbon brushes to replace)
Enhanced reliability and operational life
Electrical isolation between control and power circuits
Compact and robust design suitable for hydro environments
The Hydropower Project, is a 30.5MW run-of-river plant.
