Implements IEEE type ST1A excitation system model
This block models an excitation system where the supply of power to the controlled bridge rectifier is provided by the generator terminals through a transformer to lower the voltage to an appropriate level. The voltage regulator gain and excitation system time constants are represented by Ka and Ta, respectively.
This block is an adaptation of the ST1A excitation system of the IEEE® 421 standard, copyright IEEE 2005, all rights reserved.
The time constant Tr of the first-order system representing the stator terminal voltage transducer.
The gain Ka and time constant Ta of the first-order system representing the main regulator.
The voltage regulator input limits VImin and VImax, in p.u.
The voltage regulator internal limits VAmin and VAmax, in p.u.
The voltage regulator output limits VRmin and VRmax, in p.u.
The gain Kf and time constant Tf of the first-order system representing the derivative feedback.
The time constants Tb, Tc, Tb1, and Tc1 of the second-order system representing the lead-lag compensator.
The exciter output current limiter gain.
The exciter output current limit reference.
The rectifier loading factor proportional to commutating reactance.
The initial values of terminal voltage Vt0 and field voltage Efd0, both in p.u. Initial terminal voltage is normally set to 1 pu. The Vt0 and Efd0 values can be determined using the Powergui Load Flow tool.
Specify a value greater than zero to discretize the block at the given sample time. Set to -1 to inherit the simulation type and sample time parameters of the Powergui block.
The reference value of the stator terminal voltage, in p.u.
The measured value in p.u. of the stator terminal voltage of the controlled Synchronous Machine block.
The measured value in p.u. of the stator field current of the controlled Synchronous Machine block.
Connect this input to a power system stabilizer to provide additional stabilization of power system oscillations. When you do not use this option, connect to a Simulink ground block. The input is in p.u.
The field voltage to apply to the Vf input of the controlled Synchronous Machine block. The output is in p.u.
The power_machines example contains a Configurable Subsystem block that allows you to select between seven types of excitation systems to control the terminal voltage of the Synchronous Machine block. This configurable block refers to the power_machines_lib example library that contains seven pretuned excitation system blocks that fit simulation requirements for this example.
Right-click the EXCITATION configurable block, then select ST1A from the Block Choice menu to control the Synchronous Machine block using the ST1A Excitation System block.