System-Level AC Drive

This example shows how to model a system-level AC drive for an electric machine by using the AC-DC Converter (Three-Phase) block and Motor & Drive (System Level) block. The AC-DC converter represents a grid-side converter which provides a constant DC-link voltage. The Motor & Drive block acts as a generic AC electric machine with its DC-AC converter. This modeling approach provides fast system-level simulation without the switching events of the power converters.

Model Overview

Simulation Results from Simscape Logging

The plot below shows the requested and measured motor speed, the requested and measured motor torque, and the active power that flows from the AC grid.

Results from Real-Time Simulation

This example has been tested on these platforms:

• Speedgoat™ Performance real-time target machine with an Intel® 3.5 GHz i7 multi-core CPU and 4 GB RAM.

• dSPACE® SCALEXIO LabBox with Intel® Core XEON E3-1275v3 at 3.5GHz and 4 GB RAM.

You can run this model in real time with a step size of 50 microseconds by using the Simscape local solver. For small sample rates, a task overrun might occur during the initial task execution due to a cold cache. To avoid this overrun, if the selected platform supports these options, relax the start-up behavior by specifying a limited number of task overruns or increasing the sample time of periodic tasks during the start-up phase of the real-time application.