Controlled Current Source (Three-Phase)

Description

The Controlled Current Source (Three-Phase) block represents an ideal three-phase current source that is powerful enough to maintain the specified current through it regardless of the voltage across it. The output currents are [i_a i_b i_c] = S, where S is a vector containing the numerical values presented at the physical signal port.

The figure shows the equivalent circuit for the expanded implementation of the Controlled Current Source (Three-Phase) block.

To use the Controlled Current Source (Three-Phase) block as an abstracted current controller in an electrical drive, connect the conserving ports for the output current directly to the machine.

To access the variant implementation with an expanded, three-phase port, right-click the block and select Simscape > Block choices.

Model Examples

IPMSM Outer Loop Controller Evaluation

Control the rotor angular velocity in an interior permanent magnet synchronous machine (IPMSM) based electrical-traction drive. For evaluation of the outer loop velocity controller, the inner loop current controller is replaced by a three-phase controlled current source. An ideal torque source provides the load. The Scopes subsystem contains scopes that allow you to see the simulation results. The Control subsystem includes a PI-based outer loop controller. During the three-seconds simulation, the angular velocity demand is -1000, 2000, 3000, 4000, and then 5000 rpm. Above 1630 rpm, the IPMSM enters the field weakening mode.