Frequency-constant grid operation for power systems with zero inertia

Abstract:
During the energy transition, the electricity grid is undergoing change. The number of synchronous generators with spinning masses decreases, while the number of renewable energy sources connected to the grid via power electronics (converters) increases. Adapting the electrical power system operation to the new boundary conditions is crucial. An alternative method to conventional grid operation with load frequency control is constant frequency control. This paper presents a concept for operating the future power system with zero inertia based on voltage angle control. The identified gap in the literature regarding a hybrid operation of both control regimes and a possible transformation path is covered. Starting from the actual operation scheme with load frequency control, the transformation to a hybrid interconnected electrical power system operating with load frequency control and angle-based control is illustrated. An RMS simulation is carried out for an application in the IEEE 39-bus New England system.