Woodward easYgen-3000XT Series, Руководство пользователя

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Example 3: Islanded Parallel Operation (IOP)
• Rated generator power = 200 kW •
• Current average utilization of all generators = 95%
•
• "Start derating at" = 80 °C water temperature (i.e. analog input AI 02 is defined as
•
free derating source by parameter 15147)
• "Stop derating at" = 90 °C water temperature •
• "Max. power deviation" = 40%
•
Fig. 281: Derating: Islanded parallel operation
In islanded parallel operation the derating factor is correlated to the utilization factor of
all engines! This becomes the new Maximum for derating.
The engine is running with 95% (190 kW). If the LogicsManager is enabled and
temperature has reached 80 °C the derating becomes effective (the unit starts to derate
the current active power setpoint). If the temperature is 90 °C or higher the maximum
reduction value of 40% becomes active. The current power of 95% will be reduced by
40% to 60%.
95% x 0.6 = 57% ≙ 0.57
This engine will run now with 200 kW x 0.57 = 114 kW.
In islanded parallel operation the derating is limited to 50%. It is not possible to get the
utilization factor lower than 50% by derating function.
If the derating signals are digital (e.g. different relay outputs from a ripple control
receiver; refer to
╚═▷ “6.3.13 Ripple Control Receiver” ), the digital signals can be
transformed to an analog signal with a simple set of resistors.
The derating of power has an impact on the Load-Dependent Start/Stop functionality
(refer to
╚═▷ “6.2.1.1 Configuring Load-Dependent Start/Stop” ): The start of the next
generator will be shifted.
767 easYgen-3000XT Series B37574
6 Application Field
6.3.16.2 Derating With Characteristic Curve
Released