Dual linear active disturbance rejection control applied to grid-forming converters

Details

Supervisors

De Jaeger, Emmanuel ; Delhaye, Quentin

Faculty

Ecole polytechnique de Louvain

Degree label

Master [120] : ingénieur civil électricien, à finalité spécialisée

Abstract

enThe development of renewable energy sources in the context of the energy transition leads to a rapid increase in the use of converters in the electrical grid. This implies new challenges, such as physical limitations of converters, or grid stability and inertia. To address those, the control of the converters is the center of the subject. Much research is underway on Grid-Forming (GFM) control, and in particular that which mimics legacy generators, the Virtual Synchronous Generator (VSG) control. At UCLouvain, research is ongoing to further improve this control by adding a Linear Active Disturbance Rejection Control (LADRC) algorithm to it. The purpose is to make the converter response more flexible and predictable in the face of the system’s unknowns. This master thesis studies the application of a second LADRC to the converter control. While the first LADRC is dedicated to the active power and frequency loop, the second LADRC is dedicated to the reactive power and voltage loop. Theoretical analyses have shown the potential of using two LADRCs in a simplified system, with a semi-analytic approach. Then different models have been discussed and analyzed parametrically in time-domain, and small-signal stability is investigated. Finally, more complete models have been simulated to take a larger scale view. Though further research is necessary to justify the use of a second LADRC.