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Optimal model reference control design for grid connected voltage source converters

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Figure 2.2. Allowed regions (green zones) for the polar representation of L(s) = Z g Y l of different impedance- impedance-based stability criterion simplifications.
Figure 2.9. Effect of introducing additional feedback paths in the initial control structure: grid-side current (K i 2 ), converter-side current (K i 1 ), capacitor voltage (K v c ) and capacitor current (K i c ).
Figure 3.1. Translation of the classic one DOF feedback control scheme into the generalized control scheme.
Figure 3.6. Generalized control scheme of the H ∞ mixed-sensitivity problem applied to a grid current control.
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