Thermal (Steam) Turbines

Description

This component models an IEEE type thermal turbine.

The inputs to this model are per-unit speed w, per-unit speed reference Wref, per-unit control valve position Cv and per-unit intercept valve position Iv from the corresponding Thermal (Steam) Governor. The outputs are the mechanical torques Tm1 and Tm2 and are output from the HP and LP turbines respectively.

Turbine Models

Thermal Turbine Transfer Functions

PSCAD references [1], [2] and [3]

Input Parameters

Configuration

Hp Turbine: Contributions

Lp Turbine: Contributions

Time Constants

Intercept Valve

Control of Intercept Valve?	Choice		Select Yes or No

Turbine (HP + LP) Initial Output Power	REAL	Variable	Initial power output [pu]

Turbine Status=> 0-Initialize;1-Normal	INTEGER	Variable	A variable name can be used. This variable can come from Output Variables for Controller Initialization section of the Synchronous Machine input parameters

CV Initial Value: Variable (Same as Gov.)	REAL	Output	Initial Value of Control Valve Flow Area [pu]

Steam Chest Time Constant (T4)	REAL	Constant	Enter a value for steam chest time constant [s]

Reheater Time Constant (T5)	REAL	Constant	Enter a value for reheater time constant [s]

Reheater/Cross-Over Time Const. (T6)	REAL	Constant	Enter a value for reheater/cross-over time constant [s]

Cross-Over Time Constant (T7)	REAL	Constant	Enter a value for cross-over time constant [s]

IV Initial Value: Variable (Same as Gov.)	REAL	Output	Initial value of Intercept Valve Flow Area [pu]

Max. Value of Reheat Pressure (PRmax)	REAL	Constant	Enter tha maximum value of reheat pressure [pu]