Discrete-time or continuous-time single input power system stabilizer type PSS1A
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The SM PSS1A block implements a single-input PSS1A power system stabilizer (PSS) to maintain rotor angle stability in a synchronous machine (SM). Typically, you use a PSS to enhance damping of power system oscillations through excitation control.
V_SI— Speed, frequency, or power
Per-unit speed, frequency of the terminal bus voltage, compensated frequency, or electrical power.
V_ST— Stabilization speed, frequency, or power
Automatic voltage regulator (AVR) input stabilization signal, as limited by VST_min and VST_max
Power system stabilizer (PSS) gain, K_S (pu)— PSS gain
Power system stabilizer (PSS) forward path gain.
PSS denominator constant for second-order block, A_1— Filter constant 1
PSS signal conditioning filter coefficient 1.
PSS denominator constant for second-order block, A_2— Filter constant 2
PSS signal conditioning filter coefficient 2.
PSS numerator (lead) compensating time constant, T_1 (s)— Lead time constant 1
Lead time constant 1.
PSS denominator (lag) compensating time constant, T_2 (s)— Lag time constant 2
Lag time constant 2.
PSS numerator (lead) compensating time constant, T_3 (s)— Lead time constant 3
Lead time constant 3.
PSS denominator (lag) compensating time constant, T_4 (s)— Lag time constant 4
Lag time constant 4.
PSS washout time constant, T_5 (s)— Washout time constant
Washout time constant.
PSS transducer time constant, T_6 (s)— Transducer time constant
Transducer time constant.
Maximum PSS output, V_STmax (pu)— Maximum stabilization
Maximum power system stabilizer (PSS) output to the automatic voltage regulator (AVR).
Minimum PSS output, V_STmin (pu)— Minimum stabilization
Minimum power system stabilizer (PSS) output to the automatic voltage regulator (AVR).
Sample time (-1 for inherited)— Block sample time
-1(default) | 0 | positive scalar
Time between consecutive block executions. During execution, the block produces outputs and, if appropriate, updates its internal state. For more information, see What Is Sample Time? (Simulink) and Specify Sample Time (Simulink).
For inherited discrete-time operation, set the sample time to
For discrete-time operation, set the sample time to a positive scalar. For
continuous-time operation, set the sample time to
 IEEE Recommended Practice for Excitation System Models for Power System Stability Studies. IEEE Std 421.5-2016. Piscataway, NJ: IEEE-SA, 2016.
 Kundur, P. Power System Stability and Control. New York, NY: McGraw Hill, 1993.
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