Commande d’un convertisseur DC/AC basé sur un générateur synchrone virtuel

Abstract

In response to climate change, new production units are emerging. Synchronous generators, once predominant, are taking their place alongside renewable and intermittent energies, such as photovoltaic panels and wind turbines. These new energy sources are connected to the grid by electronic converters, which have no rotating mass. As a result, the overall inertia of the grid decreases, which can create instability and even massive load shedding. Studies have proposed inverter control technologies to overcome this defect. The objective of this thesis is to simulate and evaluate a virtual synchronous generator (VSG) model, whose purpose is to add artificial inertia. An improvement of the control including dynamic inertia is proposed. This study also seeks to measure how functional this technology is and what its limitations are. After reviewing the literature on this topic, a VSG model was simulated and tested, using Matlab/Simulink software. It was also connected in parallel with a synchronous generator to study its operation in a network. In addition, this system was compared with two synchronous machines in parallel and a simpler inverter control. On the other hand, the influence of different parameters of the model was also studied. The results show that controlling an inverter with VSG makes it possible to smooth the frequency curve and reduce its rate of change. Finally, an improvement in the control allows the rate of change of the frequency and the state of charge of the battery to be taken into account in the moment of inertia setpoint. For future research, real tests will be necessary. The possibility of coordinating a VSG control and a MPPT control would also be relevant.

Date	24 Aug 2020
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Handy Fortin Blanchette (Supervisor)