Ambitious climate strategies and targets require fundamental changes in the electrical power system: Renewable energy plants are increasingly replacing conventional ones and thus pose many challenges for the power system. The shutdown of conventional power plants (nuclear, coal) leads to a loss of mechanical inertia provided by the rotating masses of synchronous generators. In contrast, modern units (renewable energy plants, storage and loads) are often connected to the grid via converters and do not inherently contribute to the power system stability. New control concepts for power converters have emerged, which act as a voltage source and therefore can form the grid voltage and frequency. These grid-forming strategies have been implemented for microgrid applications, but are an ongoing research topic, e.g. for interconnected power systems.
In my research, I focus on control strategies for full power converters in interconnected low-inertia systems and develop an aggregation approach to replicate the dynamic behavior of active distribution grids with diversely controlled inverter based generation for investigations on transmission grid level.
Important aspects in this context are:
• Power system stability in low-inertia systems
• Integration of high shares of inverter based generation
• Control concepts for full power converter based generation in interconnected systems
• Short-term frequency stability and instantaneous frequency measurement
• Aggregated dynamic equivalent of active distribution grids