Abstract
This paper assesses the performance of renewable energy generation systems based on hydrokinetic turbines and permanent magnet synchronous generators (PMSG). For this purpose, in each unit the turbine is modeled through its power curve and the PMSG model is based the well-known dq-frame reference approach. The electronic interface with the load is composed of a boost converter, used for maximum power point tracking (MPPT), and a buck converter for DC bus voltage stabilization. An electric power generation system is then composed by three hydrokinetic generators and its behavior is tested for variable load and river speed. The results demonstrate that these systems can provide support for electric energy generation with high efficiency, keeping constant the load voltage. Also, it is possible to confirm that the parallel operation of these units at different points of a river can be realized due to control systems. Finally, the simulation allows to visualize that normal operation of generation units can be maintained even when one of them operates without the MPPT algorithm.
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