Transformation

Controller design with DQ transform

Controller design with DQ transform
  1. What is DQ controller?
  2. Why ABC to DQ transformation is needed for inverter control?
  3. Why do we use DQ transformation?

What is DQ controller?

Synchronous reference frame control is also called dq-control. It converts grid voltage and current into a frame that rotates synchronously with the grid voltage vector by Park Transformation so that three-phase time-varying signals are transformed into DC signals.

Why ABC to DQ transformation is needed for inverter control?

The transformation of the referenced system abc to dq allows the transformed signals to be continuous, which is better for the PI compensators to have zero error in steady state.

Why do we use DQ transformation?

1. The fundamental reason to transform the three-phase instantaneous voltages and currents into the synchronously rotating reference dqo frame is to make computations much easier. Secondly, it allows the system operator to independently control the active (d-axis) and reactive (q-axis) components of the currents.

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