Control development

For the operation of individual laboratory samples and demonstrators, we develop independent control systems for single-phase and three-phase inverters. In addition to classical control approaches, more comprehensive control approaches are also used here, depending on the requirements:

  • Direct PI controllers (the classic for simpler control tasks)
  • PR and VI controllers (self-oscillating controllers, ideal for single-phase power converter systems)
  • Repetitive controllers (e.g. to effectively elimate prominent, cyclically repeating disturbance variables)
  • Controllers in the dq-range (with regular, continuous or discontinuous space vector PWM)

We develop our structures both directly in C programs and in industry-standard MatLAB/Simulink tools:

Simulink project of a 3-phase inverter control system
Implemented PLL and signal adjustments
Implementation of individual current controllers

The controllers are usually implemented on industrial microcontrollers from TI (e.g. C2000 F28335 or F28379D), but are also used in rapid prototyping environments such as dSpace.

Output voltages and currents
Step response of the implemented 3-phase controller

Since both the power electronics and the control and actuation technology come from a single source, we can build and investigate actuation variants not yet available on the market or novel semiconductor combinations in a short time.

Built-up laboratory demonstrator of a 3-phase inverter with SiC semiconductors