The Diesel Generator is composed of a round rotor synchronous machine, a grid connection transformer, a speed governor, a synchronism relay and the excitation and load control.

Mask and Parameters

The Diesel Generator block contains the following tabs in the parameter configuration mask:

Generator
Governor
Excitation System (IEEE-DC1A)
- Controllers
- Exciter and Rectifier
- Initial Values
Load Controller
Transformer
Synchronism check

Generator Tab

Name	Unit	Description
Nominal parameters of the generator	VA, Vrms, Hz	Nominal power, nominal line to line RMS voltage and nominal frequency of operation of the synchronous machine
Reactances	pu	Direct (d) axis and quadrature (q) axis reactances of the synchronous machine, leakage reactance
Time constants	s	Time constants of the direct axis and quadrature axis. Can be chosen between short-circuit or open-circuit time constants
Stator resistance	pu	Stator resistance of the synchronous machine
Mechanical parameters	pu	Inertia coefficient (or H constant), friction factor and pair of poles of the synchronous machine
Initial conditions	%, degrees, pu	Initial steady state values of speed deviation (in percent), electric angle of the rotor, phase currents (module and angle) and field voltage of the synchronous machine
Simulate saturation	-	check box to indicate if the saturation of the synchronous machine will be taken into account
no-load curve	pu	Field current and voltage values at machine terminals

Governor Tab

Name	Unit	Description
Regulator gains	-	Regulator gains for the isochronous mode and following mode
Time constants Isochronous mode	s	Regulator time constants for the isochronous mode
PI regulator P following mode	-	PI regulator gains for the following mode
Actuator time constants	s	Time constants for the actuator of the governor
Torque limits	pu	Maximum and minimum torque limits
Other parameters	s, pu, %	Engine time delay, Initial value of mechanical power, Droop in percentage

Excitation System (IEEE-DC1A) Tab

Name	Unit	Description
Low-pass filter time constant	s	Time constant for the low-pass filter of the IEEE-DC1A excitation system
Voltage regulator parameters	s	Gain and time constant parameters for the voltage regulator of the IEEE-DC1A excitation system
Damping filter parameters	s	Gain and time constant parameters for the damping filter of the IEEE-DC1A excitation system
Transient gain reduction lead and lag time constants	s	Time constant parameters for the lead-lag stages of the IEEE-DC1A excitation system

Name	Unit	Description
Exciter gain and time constant	s	Gain and time constant parameters for the exciter of the IEEE-DC1A excitation system
Field voltage values	pu	Voltage values for the exciter of the IEEE-DC1A excitation system
Exciter saturation values	pu	Function values for the saturation simulation of the IEEE-DC1A excitation system

Load Controller Tab

Name	Unit	Description
Proportional and integral gains	-	PI controller gains for load control droop function
Output initial values and limits	pu	Initial condition for the output of the controller, and maximum-minimum limits

Name	Unit	Description
Proportional and integral gains	-	PI controller gains for load control reactive power function
Output initial values and limits	pu	Initial condition for the output of the controller, and maximum-minimum limits

Transformer Tab

Name	Unit	Description
Winding connection on the high side voltage of the transformer	-	Possible connection types for the high voltage windings of the transformer (Y/Yn/Yg/delta (lag or lead) )
Winding connection on the low side voltage of the transformer	-	Possible connection types for the low voltage windings of the transformer (Y/Yn/Yg/delta (lag or lead) )
Transformer core type	-	Possible core types for the transformer (three-single phase transformers/core-type/shell-type)
Simulate saturation	-	check box to indicate if the saturation of the transformer will be taken into account
Transformer parameter units	-	Choose between SI or per unit (pu) values
Nominal power	VA	Rated power of the three-phase transformer
Parameters of the high voltage side of the transformer	V, ohms or pu, H or pu	Rated voltage of the high voltage winding, resistance and inductance of the winding
Parameters of the low voltage side of the transformer	V, ohms or pu, H or pu	Rated voltage of the low voltage winding, resistance and inductance of the winding
Magnetizing resistance of the transformer	ohms or pu	Parallel resistance of the magnetization branch of the transformer
Magnetizing inductance of the transformer	H or pu	Parallel inductance of the magnetization branch of the transformer
Zero-sequence inductance L0 flux path return	H or pu	Zero-sequence inductance for the three-limb core transformer
Saturation curve	A, V.s	Excitation current and flux linkages values of the curve

Synchronism check Tab

Name	Unit	Description
Enable	-	Enable/disable the relay operation
Data voltage threshold	%	Threshold limit for the voltage
Delta angle and frequency threshold	degrees, Hz	Threshold limit for the angle and the frequency
Breaker Close time	s	Breaker Closing time
Freezing time	s	The initial time during which the breaker will remain zero i.e. the breaker will be open
Voltage check	-	Voltage check functionality enable/disable
Vmin	% of Vll	Threshold voltage below which Bus/Line considered to be dead/non-energized
Vmax	% of Vll	Threshold voltage above which Bus/Line considered to be live/energized

Inputs, Outputs and Signals Available for Monitoring

Inputs

Name	Unit	Description
P ref	pu	Active power reference
Q ref	pu	Reactive power reference
V ref	pu	Voltage reference
w ref	pu	Speed reference
status	-	0 = Disconnected from the grid or 1 = Connected to the grid
Islanded	-	0 = Disabled or 1 = Enabled

Outputs

Name	Unit	Description
m	kW, kVAr, kV, A, pu	In this port there are 5 signals to monitoring the operation of the block: 1)Power delivered by the diesel generator 2)Reactive power delivered by the diesel generator 3)Voltage RMS at the terminal of the diesel generator 4)Current RMS delivered at the terminal of the diesel generator 5)Reserve reactive power of the diesel generator
A	-	Connection port to phase A of the grid
B	-	Connection port to phase B of the grid
C	-	Connection port to phase C of the grid