ISBN 9783843956451

978-3-8439-5645-1, Reihe Energietechnik

Marc René Lotz
Systematic Development of a Laboratory-Scale HVDC System with Power-Hardware-in-the-Loop Simulation Capabilities for the Validation of Control and Protection Principles

305 Seiten, Dissertation Technische Universität Braunschweig (2025), Softcover, A5

Zusammenfassung / Abstract

In the area of control and protection principles for complex HVDC system configurations, and the analysis of AC/DC system interactions, developments are at a stage where demonstration in laboratory environments gains significant momentum. To achieve the necessary complexity of laboratory-scale demonstrators, Power-Hardware-in-the-Loop (PHiL) simulation is a key enabler.

What can be observed is that there is a lack of a holistic description with regard to the research activities that considers both the laboratory-scale HVDC system demonstration and the PHiL Modular Multilevel Converter (MMC) simulation aspects. This is why this work follows a systematic and holistic development process, so that not only a detailed description of implementing PHiL MMC simulations with stability analysis and interface design is given, but a demonstrator is developed that feasibly represents a laboratory-scale HVDC system and enables validation of control and protection principles. This contributes significantly to HVDC system studies, which is essential for increasing the TRL and understanding of AC/DC system interactions.

To increase confidence in utilizing PHiL simulations in this research area, one MMC of the laboratory-scale demonstrator consists of a PHiL MMC simulation, which will also be developed in this work. For this, the PHiL testbed will be characterized in detail, including the Real-Time Simulator (RTS) and power amplifier characteristics, and time delays to be expected due to the communication interfaces and timing of the model calculation. Types of MMC simulation models will be evaluated, which results in the implementation of a selfdeveloped Type 4 model on the RTS. By developing comparable subsystems, the maturity of PHiL simulations can be analyzed with regard to feasibility of representing an actual MMC in the laboratory environment.