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Control Approaches for Parallel Source Converter Systems 197
Figure 5.60 Voltage H N cascaded Ideal CPL Step 10.3 - 17.8 MW.
Figure 5.61 Current H N cascaded Ideal CPL Step 10.3 - 17.8 MW.
manner. We are interested in observing how the H N controller behaves
when a nonlinear load such an ideal CPL is introduced into the system.
Additionally, the impact of measurement uncertainties is tested to observe
robustness properties. The droop resistances are set equal to provide equal
voltage references to the primary controller. A voltage drop of 0.3 p.u at
full load was considered while designing the droop controller. This value
provides sufficient resolution in primary voltage references at low loads to
prevent improper current sharing and at the same time, furthermore the
drop does not create instability at peak loads. A load step increase of
