Ilka Jahn

RWTH Aachen University

The stability of a power electronicssystem can be assessed by means of the impedance-based stability criterion. Impedance modeling is a useful tool to analyze the effect of different circuit parameters and control schemes on the behavior of a converter. Modeling the input impedance of a power electronics converter is often successful when having fu...

Control systems of modular multilevel converters can be partitioned into several levels. Such partitioning is becoming relevant in multi-vendor high-voltage direct-current systems where one party may deliver the converter hardware and associated control, whereas another party may deliver the system-related control. However, the exact control system...

High voltage direct current (HVDC) grids are envisioned for large-scale grid integration of renewable energy sources. Upon realization, components from multiple vendors have to be coordinated and interoperability problems can occur. To address these problems, a multi-vendor HVDC system can benefit from a partially open control and protection system...

Research on fault detection for high-voltage direct current (HVDC) grids has had a focus on single-ended DC fault detection using information from only the local line end. This paper proposes the use of additional information from neighbouring lines around the same busbar in a multiple-input single-output (MISO) fault detection. Simulations results...

Testing of protection intelligent electronic devices (IEDs) for high-voltage direct-current (HVDC) systems is usually constrained to simulated HVDC faults because systematic testing with faults on full-scale HVDC systems is not feasible. However, all simulations are subject to inaccuracies. In this paper, an HVDC IED prototype is tested with real f...

Protection system design for high-voltage direct-current (HVDC) grids using DC circuit breakers (DCCBs) is not straightforward. Both hardware parameters, such as line inductors and DCCBs, as well as software parameters, such as protection threshold settings and protection margins, have to be taken into account and interact. Previous studies focused...

This article provides an up-to-date overview of technologies and explores key barriers on the path to implementing High Voltage DC (HVDC) grid protection in the European context. It brings together a wide range of stakeholders including key equipment manufacturers, grid operators, developers, testing laboratories, consultants, research institutes a...

Future multivendor, and multiterminal high-voltage direct-current (HVDC) grids are considered an enabling technology to efficiently integrate large amounts of renewable energy into the existing grid. However, already in today's existing point-to-point HVDC links, control and harmonic interaction issues and instabilities related to the control and p...

Future multivendor, and multiterminal high-voltage direct-current (HVDC) grids are considered an enabling technology to efficiently integrate large amounts of renewable energy into the existing grid. However, already in today's existing point-to-point HVDC links, control and harmonic interaction issues and instabilities related to the control and p...

Integrating multiterminal high-voltage direct-current (HVDC) connections into the existing alternating current (AC) power transmission system is a possible solution for transport of large amounts of renewable energy. Protection is considered a key enabler for multiterminal HVDC (MTDC) grids. Designing such a protection system is a challenge, in par...

Future large scale HVDC systems will have components from different manufacturers, however, this will require multi-vendor interoperability. This paper studies multi-vendor interoperability of HVDC protection IEDs using hardware IED prototypes developed by industrial and academic partners. Multi-vendor interoperability tests are performed using rea...

The integration of large amounts of renewable energy will require multiterminal high-voltage direct-current (MTDC) grids to reliably transport the energy over long distances. However, before building an MTDC grid, a functional protection system design is needed. Realistic and industrial studies are required to validate the functionality of such a s...

Future multiterminal high-voltage direct-current (HVDC) grids are considered an enabling technology to efficiently integrate large amounts of renewable energy into the existing grid. However, already in today’s existing point-to-point HVDC links, harmonic interaction issues and instabilities related to the control and protection system of the conve...

DC circuit breakers (DCCBs) are one of the key components to facilitate large meshed HVDC grids. Driven by the needs for achieving high speed, low loss and low cost, various DCCB technologies have been proposed for HVDC applications. Unlike AC circuit breakers (ACCBs), some DCCBs provide a variety of functions, such as proactive opening or fault cu...

Protecting high-voltage (HV) DC grids requires a different approach compared with that of ac power system protection and poses one of the major challenges that must be resolved before the realization of largescale HVdc grids that use equipment from multiple vendors. HVdc grid protection, which is essential for safe and reliable HVdc grid operation,...

The increased demand for renewable energy generation requires higher flexibility of transmission systems. This requirement together with technical progress in high-voltage direct-current (HVDC) technology have resulted in the ambition to build large-scale multi-terminal DC (MTDC) grids. To achieve this goal, vendor interoperability is considered a...

In future high-voltage direct current (HVDC) systems, a large number of HVDC breakers will be required. In this paper, the influence of HVDC breakers on the transient performance of point-to-point HVDC links in both asymmetrical and symmetrical monopolar configuration with half-bridge modular multilevel converters is studied with simulations in PSC...

Recent demand of renewable energy generation has placed new requirements on the flexibility of transmission systems. These requirements together with technical advancements of high-voltage direct-current (HVDC) technology have resulted in the ambition to build large-scale multi-terminal DC grids (MTDC). These large-scale MTDC grids are expected to...