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Study of control strategies of power electronics during faults in microgrids 115
3.1 Flexible oscillating power control
To flexibly control the relative amplitudes of the oscillating power, the work in Ref.
[7] introduces two adjustable scalars k and k in current references as:
p
q
P ∗
−
+
∗
i = 2 2 ( v + k v ) (7.24) 2 2
p
P
v + + k v − iP∗=P∗v+ +kpv− v++kpv−
p
Q ∗
+
−
i = 2 2 ( v + k v ) (7.25) 2 2
∗
q
Q
⊥
⊥
v + + k v − iQ∗=Q∗v+ +kqv− v⊥++kqv⊥−
q
Figure 7.2 Short-circuit response of VSI. (A) Using complete voltage and current signals. (B)
Using positive-sequence voltage and current signals. (Voltage: V; Current: A; Power: kW/kvar).
