# Stabilizer Model: WTGPT_A and WTPTA1

AutoCorrection Properties

Following checks and corrections are applied during Validation and AutoCorrection.

- If 0 < Tp < Mult*TimeStep then Tp = Mult*TimeStep
- If RThetaMax < RThetaMin then swap the values. If RThetaMax < 0 then RThetaMax change sign to positive. If RThetaMin > 0 then change sign to negative.
- If ThetaMax < ThetaMin then swap the values.

Mult represents the user-specified value **Minimum time constant size as multiple of time step** option on the Validation page of the Transient Stability Dialog

TimeStep represents the integration time step being used as described on TimeStep

Model Equations and/or Block Diagrams

**Parameters for WTGPT_A:**

Tp | Blade response time constant, sec |

Kpp | Pitch control porportional gain, deg/pu-speed |

Kip | Pitch control integral gain, deg/pu speed-sec |

Kpc | Pitch compensator proportional gain, deg./pu P |

Kic | Pitch compensator integral gain, deg/pu P-sec |

ThetaMin | Minimum pitch, deg |

ThetaMax | Maximum pitch, deg |

RThetaMin | Pitch rate limit negative, deg/sec |

RThetaMax | Pitch rate limit, deg/sec |

Kcc | Cross Proportional Gain |

MVABase | MVABase: MVABase for the object parameters |

**Parameters for WTPTA1:**

Kiw | Pitch control integral gain, deg/pu speed-sec |

Kpw | Pitch control porportional gain, deg/pu-speed |

Kic | Pitch compensator integral gain, deg/pu P-sec |

Kpc | Pitch compensator proportional gain, deg./pu P |

Kcc | Cross Proportional Gain |

Tp | Blade response time constant, sec |

ThetaMax | Maximum pitch, deg |

ThetaMin | Minimum pitch, deg |

RThetaMax | Pitch rate limit, deg/sec |

RThetaMin | Pitch rate limit negative, deg/sec |