Woodward easYgen-3000XT Series, Manual, Page: 396 / 1205

Islanded operation (IOP)
• P
Reserve
= P
rated active
– P
GN real active
•
• P
rated active
= P
RatedGen[1]
+ P
RatedGen [2]
+ … + P
RatedGen [n]
•
(total rated power of all gensets on the busbar in the system)
• P
GN real active
= P
ActualGen [1]
+ P
ActualGen [2]
+ … + P
ActualGen [n]
•
(total actual load of all gensets on the busbar in the system)
If the reserve power falls below the IOP Reserve power threshold (parameter ╚═▷ 5760 ),
another genset will be added.
• P
Reserve
< P
Reserve IOP
•
If the reserve power exceeds the IOP Reserve power threshold (parameter ╚═▷ 5760 ) plus
the hysteresis (parameter ╚═▷ 5761 ) plus the rated load of the genset, the genset will be
stopped.
The hysteresis is intended to prevent frequent starting and stopping of gensets in case of
small load variations.
• P
reserve
> P
reserve islanded IOP
+ P
hysteresis IOP
+ P
RatedGen
•
Mains parallel operation (MOP)
• P
reserve
= P
rated active
– P
GN real active
•
• P
rated active
= P
RatedGen [1]
+ P
RatedGen [2]
+ … + P
RatedGen [n]
•
(total rated power of all gensets on the busbar in the system)
• P
GN real active
= P
ActualGen [1]
+ P
ActualGen [2]
+ … + P
ActualGen [n]
•
(total actual load of all gensets on the busbar in the system)
If the required generator load setpoint for the control at the mains interchange point
exceeds the MOP minimum load threshold (parameter
╚═▷ 5767 ), the first genset will be
added.
• P
MN setpoint
– P
MN real
> P
MOP minimum
•
If at least one genset is supplying the load in parallel with the mains and the reserve
power falls below the reserve power threshold (parameter
╚═▷ 5768 ), another genset will
be added.
• P
reserve
< P
reserve parallel
•
If at least two gensets are supplying the load in parallel with the mains and the reserve
power exceeds the MOP Reserve power threshold (parameter
╚═▷ 5768 ) plus the
hysteresis (parameter ╚═▷ 5769 ) plus the rated load of the genset, the genset will be
stopped.
The hysteresis is intended to prevent frequent starting and stopping of gensets in case of
small load variations.
• P
reserve
> P
reserve parallel
+ P
hysteresis MOP
+ P
RatedGen
•
396 easYgen-3000XT Series B37574
4 Configuration
4.4.5.5.2 System Reserve Power
Released