Comparison of DFIG and Synchronous Machine for Storage Hydro-Power Generation

Among the alternative methods for energy storage , using the potential energy of water stored in different heights has been considered by human for ages. Storage pumping plants have been invented for this purpose and are considered as one of the most reliable and effective methods of storing the electrical energy. Factors such as having appropriate static and dynamic stability, high efficiency, suitable steady state and transient performance, the least cost of manufacturing, utilities and etc. can play a major role in choosing the type of machines for energymaking. Therefore, advantages and capabilities of variable speed storage -pumping plants, compared with conventional synchronous ones, have drawn into consideration in this paper. Different viewpoints such as structure and steady state behavior are focused for comparing the application of Doubly Fed Induction Generators (DFIG) and synchronous ones in storage hydro plants. Dynamic stimulations are also used to evaluate the performance of variable-speed versus synchronous fixed-speed generation units.