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The DQ0 transform is a space vector transformation of three-phase time-domain signals from a stationary phase coordinate system (ABC) to a rotating coordinate system (DQ0).
Every machine that is modeled in the DQ0 coordinate frame is interfaced to the ABC coordinate frame (the real world) using the following ABC↔DQ0 transform structure:
The matrix representing the expressions for the VD and VQ controlled voltage
The matrix representing the expression for the Ia, Ib, and Ic controlled current
If the reference frame is stationary, then θ is always zero. This is the case for the Induction machine squirrel cage model in Multisim.
If the reference frame is rotating synchronously with the rotor, then θ is the instantaneous mechanical angle of the rotor. This is the case for the Synchronous permanent magnet model in Multisim.