Complete Structural Diagram of Generator Excitation System and Its Working Principle

Complete Structural Diagram of Generator Excitation System and Its Working Principle

1. Overall structure of the excitation system (composed of four major modules)

III. Complete Working Process of the Excitation System

1. Generator starts → Excitation system supplies DC current to the rotor

2. Rotor establishes a magnetic field → Voltage is induced in the stator

3. AVR monitors terminal voltage in real time → Automatically increases or decreases excitation current to stabilize voltage

4. After grid connection: adjusting excitation = adjusting reactive power; strong excitation responds to grid faults

5. Shutdown/fault: Demagnetization device quickly removes rotor magnetic field

IV. A mnemonic summary for you

AVR regulates voltage and controls reactive power, power rectifier supplies the rotor, demagnetization protection ensures safety, grid stability relies entirely on it.