Documentation Home Page HYPERSIM Home Page
Pour la documentation en FRANÇAIS, utilisez l'outil de traduction de votre navigateur Chrome, Edge ou Safari. Voir un exemple.

DEGOV


Description

DEGOV1 is the Woodward diesel generator governor model developed in line with the governor-turbine architecture given in the references [1-3]. The governor model consists of an electric actuator, a fuel injection actuator and the diesel engine. 

Mask and Parameters

AVR parameters

Expanding the "DEVGOV1 Block diagram" displays the block diagram in the parameters window.



Name

Description

Unit

T1


Electric Control Box time constants



s

T2

s

T3

s

T4

Actuator time constants and gain

s

T5

s

T6

s

K

pu

TD

Engine time delay

s

R

Droop

pu

TE

Power droop Time constant

s

Pm0

Initial mechanical power output

pu

Tmax

Maximum limit

pu

Tmin

Minimum limit

pu

Selector

0= Feedback signal is take from output of actuator

1= Feedback signal is take from output of electrical port

Boolean

Initial value tab


Name

Description

Unit

Pm0

Initial power output

pu


The initial power output can be set manually, by entering a numerical value. It can also be set automatically based on load flow calculations, by entering a referenced synchronous machine variable. Machine variables can be found in the machine netlist. 

For instance, if the name of the synchronous machine on which the governor/turbine is connected is “SM1”, then Pm0 shall be set as =SM1.Peo/SM1.BaseMVA, if a thermal machine or a hydraulic machine is used, and as "=SM1.lfP/1e6/SM1.sBase" if a pu standard or a pu fundamental machine is used, where Peo and IfP are the initial power outputs of the machines, respectively.

The HYPERSIM simulation option “Set Initial Conditions” must be checked for the automatic initialization to work properly.

Inputs and Outputs and Additional Signals Available for Monitoring

Inputs

NameDescription

Unit

wref

Reference speed of the Governor

pu

w

Machine actual speed

pu

VAR

External reference (Pref, etc)

pu

Pe

Electrical power input

pu

*Vuel and Voel are normally inputs to this excitation system but the user has the option to use a fixed constant value directly in the mask by choosing internal in the mask option.
**The observable field current Ifd from the synchronous machine in HYPERSIM needs to be multiplied in its current version by the machine’s Xad = Xd – Xl prior to its input to the exciter if a thermal machine or a hydraulic machine is used. This multiplication is not required if a pu standard or pu fundamental machine is used.

Outputs

NameDescription

Unit

Pm

Mechanical power output

pu 

Limitations

The variable TD for transport delay has a maximum buffer size of 20,000 input points. For example at 5us, the maximum TD allowed is 100ms.

TD = 20000 * 5us = 100 ms

References

1. P. Kundur, Power System Stability and Control, New York:McGraw-Hill, 1994.

2. NEPLAN AG. Turbine-Governor Models, Standard Dynamic Turbine-Governor Systems in NEPLAN Power System Analysis Tool; NEPLAN: CH-8700 Küsnacht (ZH), Switzerland, 2013; p. 91.

3. PSS®E 34.2.0 Model Library. NY, USA: Siemens Industry, Inc., 2017.

OPAL-RT TECHNOLOGIES, Inc. | 1751, rue Richardson, bureau 1060 | Montréal, Québec Canada H3K 1G6 | opal-rt.com | +1 514-935-2323