Functional Description .
42 | ECW500
In which:
is the measured voltage at the analog input (40028)
is the current measured at the analog input (40026).
is the full scale adjusted (30256).
6.5.4 MTVC_DROOP
(Mode: Terminal Voltage Control with DROOP) In this mode, the ECW500 operates in the load compensation
mode, based on reactive power that the synchronous machine is generating or absorbing. To do this, an
impedance is simulated at the machine terminals and the voltage is regulated in point inside or outside of the
synchronous machine. In this mode, the operation is always in parallel with the network (online) or in parallel with
a generator set.
Two compensation modes are available: droop and line-drop compensation.
In the droop mode, the reference voltage is reduced considering the increase of the reactive power at the
output of the synchronous machine.
On the other hand, in the line-drop compensation mode, the ECW500 regulates the voltage in a point outside
the machine, in the step-up transformer or even in a point along the transmission system. The compensation
produces an increasing reference voltage for the increase of the reactive power at the output of the machine.
For operation on MTVC DROOP mode, the user must adjust the compensation constant of this mode
(parameter 30216), which is a percentage value of the nominal power of the machine.
When the compensation constant is positive, the droop compensation is performed.
When it is negative, the line drop compensation is active.
The equation below shows the value of voltage Droop that will be subtracted from (or added) of (to the) main
reference.
In which:
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