User Manual 2 Product Description
13
adjusted in -20 % per Volt.
Over-Frequency Response
When there is an increase in grid frequency which exceeds the Start value, the
inverter will reduce the power output linearly with an increase of frequency until
the End value is reached.
Tab. 2-10 Definition of Over-frequency Response Parameters
Over-frequency
derating curve
Curve A: non-hysteresis
Curve B: hysteresis
The actual AC output power at the instance when the
frequency reaches the Start frequency.
The Start frequency value for over-frequency response.
The Stop frequency value for over-frequency response.
The active power reduction rate relative to the actual power
Pm per Hz.
Over-frequency derating response time (intentional delay).
Recovery waiting time after over-frequency derating
(deactivation time).
Over-frequency derating recovery point (deactivation
threshold).
Tab. 2-11 Default Values for Over-frequency Response Parameters
Only configurable for curve B, equal to the Start value by default.
The following figure shows the over-frequency response.
Between the Start value and the End value, all adjustable power generation
systems shall reduce (for frequency increase) or increase (for frequency
decrease) the active power Pm generated instantaneously, as shown on the
curve a.
For countries except Italy, if the grid frequency drops again to a value below the
value of OverFrq Start and if the possible generation power at that instant is
greater than the active power Pm, the increase of the active power supplied to
the grid will not exceed a gradient of 10 % of the maximum active power per
minute, as shown on the curve b.
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