Governor Type 3

IEEE type 3 linearized speed-governing hydro turbine model

Since R2020a

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Libraries:
Simscape / Electrical / Control / Turbine-Governors

Description

The Governor Type 3 block models a model IEEEG3 hydro turbine-governor with penstock dynamics.

This block has a more detailed governor model than the Governor Type 1 block and uses a linearized model of the turbine, or water, column model and penstock dynamics.

You can switch between continuous and discrete implementations of the block by using the Sample time (-1 for inherited) parameter. To configure the governor for continuous time, set the Sample time (-1 for inherited) property to 0. To configure the governor 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 block:

Ports

Input

speed_pu — Turbine speed

scalar

Speed of the turbine, in per-unit representation, specified as a scalar.

Data Types: single | double

Pref — Speed reference bias

scalar

Bias to the speed load reference, specified as a scalar. Connect this port to the Pref output port of a turbine load controller block, such as the Controller LCFB1 block.

Data Types: single | double

Output

Pmech — Mechanical power

scalar

Mechanical power, returned as a scalar.

Data Types: single | double

Parameters

General

Speed reference (pu) — Speed reference

1 (default) | scalar

Per-unit speed reference.

Initial torque (pu) — Initial torque

0.45 (default) | scalar

Per-unit initial torque at the start of the simulation.

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? and Specify Sample Time.

For inherited discrete-time operation, set this parameter to -1. For discrete-time operation, set this parameter to a positive integer. For continuous-time operation, set this parameter to 0.

If this block is in a masked subsystem or a variant subsystem that supports switching between continuous operation and discrete operation, promote this parameter to ensure correct switching between the continuous and discrete implementations of the block. For more information, see Promote Block Parameters on a Mask.

Governor

Gate servomotor time constant, T_g (s) — Time constant for gate servomotor

0.52 (default) | scalar

Time constant for the gate servomotor, in seconds.

Pilot value time constant, T_p (s) — Time constant for pilot value

0.07 (default) | scalar

Time constant for the pilot value, in seconds. This parameter is associated with the block labeled "Low-Pass Filter" in the diagram.

Opening gate rate limit, U_o (pu/s) — Limit of opening gate rate

0.15 (default) | scalar

Per-unit limit of the opening gate rate. This parameter is associated with the block labeled "Low-Pass Filter" in the diagram.

Closing gate rate limit, U_c (pu/s) — Limit of closing gate rate

-0.15 (default) | scalar

Per-unit limit of the closing gate rate. This parameter is associated with the block labeled "Low-Pass Filter" in the diagram.

Maximum gate position, on MVA capability, P_max (pu) — Maximum position of gate

0.75 (default) | scalar

Maximum per-unit position of the gate, on MVA capability.

Minimum gate position, on MVA capability, P_min (pu) — Minimum position of gate

0 (default) | scalar

Minimum per-unit position of the gate, on MVA capability.

Permanent speed droop coefficient, R_perm (pu) — Permanent speed droop coefficient

0.05 (default) | scalar

Per-unit permanent speed droop coefficient.

Transient speed droop coefficient, R_temp (pu) — Transient speed droop coefficient

0.6 (default) | scalar

Per-unit transient speed droop coefficient. This parameter is associated with the block labeled "Filtered Derivative" in the diagram.

Governor time constant, T_r (s) — Time constant of governor

25 (default) | scalar

Time constant of the governor. This parameter is associated with the block labeled "Filtered Derivative" in the diagram.

Water starting time constant, T_w (s) — Water starting time constant

5 (default) | scalar

Water inertia time constant. This parameter is associated with the block labeled "Lead-Lag" in the diagram.

Penstock coefficient, a_11 — Penstock dynamics coefficient

0.75 (default) | scalar

Coefficient for the penstock dynamics. This parameter is associated with the block labeled "Lead-Lag" in the diagram.

Penstock coefficient, a_13 — Penstock dynamics coefficient

0.75 (default) | scalar

Coefficient for the penstock dynamics. This parameter is associated with the block labeled "Lead-Lag" in the diagram.

Penstock coefficient, a_21 — Penstock dynamics coefficient

0.75 (default) | scalar

Coefficient for the penstock dynamics. This parameter is associated with the block labeled "Lead-Lag" in the diagram.

Penstock coefficient, a_23 — Penstock dynamics coefficient

0.75 (default) | scalar

Coefficient for the penstock dynamics. This parameter is associated with the block labeled "Lead-Lag" in the diagram.

References

[1] Overbye, Tom Power Systems Stability, Lecture Notes. Texas A&M University.

[2] Dynamic Models for Steam and Hydro Turbines in Power System Studies, IEEE Transactions on Power Apparatus and Systems. Vol. PAS-92, Number 6, 1973, pp. 1904–1915.

[3] IEEE Guide for the Application of Turbine Governor Systems for Hydroelectric Generating Units, IEEE Std 1207-2011.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020a