SM PSS2C
Discrete-time or continuous-time single input PSS2C power system stabilizer
Since R2020a
Libraries:
Simscape /
Electrical /
Control /
SM Control
Description
The SM PSS2C block implements a double-input PSS2C power system stabilizer (PSS) that maintains rotor angle stability in a synchronous machine (SM) in conformance with IEEE 421.5-2016[1]. Typically, you use a PSS to enhance the damping of power system oscillations through excitation control.
You can represent two different types of dual-input power system stabilizers with this same model:
A stabilizer that uses electrical power and speed (or frequency) signals to calculate the integral of the accelerating power. This makes the calculated stabilizer signal insensitive to mechanical changes.
A stabilizer that uses a combination of electrical power and either speed or frequency. To achieve the desired stabilizing signal shaping, the system uses the speed directly, without phase-lead compensation, and adds a signal that is proportional to the electrical power.
You can switch between continuous and discrete implementations of the block by using the
Sample time (-1 for inherited) parameter. To configure the
integrator for continuous time, set the Sample time (-1 for
inherited) property to 0
. To configure the integrator
for discrete time, set the Sample time (-1 for inherited) property
to a positive, nonzero value, or to -1
to inherit the sample time
from an upstream block.
This diagram illustrates the overall structure of the PSS2C power system stabilizer:
In the diagram:
V_SI1 and V_SI2 are the two power system stabilizer inputs. Commonly used inputs are speed, frequency, or power.
Two Washout (Discrete or Continuous) blocks are represented for each stabilizer input, with time constants TW1 to TW4, along with a transducer, represented by a Low-Pass Filter (Discrete or Continuous), with time constants T6 and T7.
To allow a ramp-tracking filter characteristic, the Ramp Tracking Filter subsystem models a network of lead-lag and low-pass filter blocks in series.
To provide phase compensation, a Lead-Lag (Discrete or Continuous) network models additional dynamics associated with the power system stabilizer, representing four stages of lead-lag compensation, with time constants T1 to T4 and T10 to T13.
The PSS output logic subsystem allows the representation of the PSS output logic associated with the generator active power output. PPSSon and PPSSoff are the threshold values used to define a hysteresis.
Ports
Input
Output
Parameters
References
[1] IEEE Recommended Practice for Excitation System Models for Power System Stability Studies. IEEE Std 421.5-2016. Piscataway, NJ: IEEE-SA, 2016.
Extended Capabilities
Version History
Introduced in R2020a