PID-controller AVR

# Voltage error gain K0v — voltage deviation channel gain

# Voltage derivative gain K1v — voltage change rate channel gain

# Field current derivative gain K1Ifd — gain on the excitation current rate channel

# Frequency error gain K0f — gain on the channel of voltage frequency deviation from nominal frequency

# Frequency derivative gain K1f — gain on the voltage frequency rate channel

# Voltage derivative time constant T1, s — lag time constant of the generator voltage change rate channel

# Frequency error time constant T2, s — delay time constant on the channel of voltage frequency deviation from nominal voltage frequency

# Frequency derivative time constant T3, s — lag time constant of the voltage frequency rate channel

# Frequency time constant T4, s — delay time constant on the channel of voltage frequency deviation from nominal voltage frequency

# Field current derivative time constant T5, s — time constant of the lag time of the excitation current rate channel

# Integrator time constant T6, s — delay time constant of the common ADF channel

# Time delay branch magnitude voltage T7, s — time of net delay on the generator voltage change rate channel

# Time delay branch field current T8, s — time of net delay by channel excitation current rate of change

# Time delay branch frequency voltage T9, s — time of net delay on voltage frequency rate channel

# Сompensated transformer resistance Xcompounding, pu — transformer reactance compensated by the controller

# Integrator branch limits [Vmax Vmin], pu — limits of the output value of the integrating branch

# Initial condition of the regulator voltage, pu — initial value of the voltage regulator

# Initial condition of terminal voltage magnitude, pu — initial voltage value at the generator terminals