Answer Question
the reference negative sequence current is zero however the output current is not zero
Dear sir
I am working on integrating three-phase inverter to grid with unbalanced voltage due to faults. The positive and negative sequence is extracted using DDSRF. It is required to share a balanced current during faults so the inner control loop looks like the attached figure with i dref =i qref =0.
However, the output current isn’t balanced during the fault period.
So what do you think about this problem?