After successful completion of the course, students are able to understand, simulate and dimension typical medium voltage converter, especially multi-cell/multi-level converter systems. Furthermore, students are able to compare such converter systems competitively. Students understand the EMC problems and the grounding concepts of converters that are directly connected to the medium voltage grid, and especially of medium voltage drives that are connected directly to the grid without a transformer. Ultimately, they have gained a deep insight into medium voltage converter applications and the underlying long-term market and technology trends.

The focus of the course is on modern medium voltage converter systems, typically in a voltage range of 3 kV to 50 kV and a power range of 1 MW upwards. Converter systems like the two-level converter which is connected via transformer to the medium voltage grid, the multi-level NPC converter, multi-level flying capacitor converter, Hybrid-ANPC converter, MMC, high-power diode and thyristor converter with multi-pulse transformer, are discussed and simulated in detail, furthermore grid transformer vs. medium frequency transformer (MFT), medium voltage grid standards, and the Solid State Transformer (SST). Also discussed are today’s typical applications in exponentially growing markets, especially PV solar, medium-voltage drives, wind power, hydrogen production and storage, E-mobility and electric vehicles (EV), data centers, green steel. Furthermore, the students learn about the driving forces of medium voltage power electronics, specifically the markets, political constraints and advanced technologies.

Explanation and discussion of the basic structures of the relevant converter circuits and their typical applications. The focus of the exercise part is the joint simulation of medium-voltage converters.

The course takes place in person. Registration via TISS is required.

All registered participants can download the presentation slides via TISS (note copyright!).

The simulation software used in the exercises is the free power electronics circuit simulator VokiDrill, which can be downloaded from TISS and runs under Java (installation of JDK 11 or higher is required, e.g. from https://jdk.java.net/). If someone does not have an own computer, the institute will provide a computer as part of the exercises.

oral

There is currently no script available for the course. The lessons are taught using slides that can be downloaded via TISS after registration. The exercise examples in the form of simulation model files are provided by the lecturer as part of the exercise.

This course is part 2 of the three power electronics specialization lectures 372.033, 370.031 and 370.030. Part 1 (372.033) is the basic power electronics lecture and attendance of this lecture is a prerequisite for attending this course. Alternatively, however, a completed course comparable to 372.033 at another university or a comparable course with a focus on power electronics, e.g. at a technical college (HTL) also counts.

Please contact the lecturer if you have not attended course 372.033 and would still like to attend this course.