Figs. 8–11 show that the BDFIG controller can track the reference speed by adjusting the real power flow independently from the reactive power consumption. The generation of reactive power, on the other hand, is dependent on the total capacity of power machine, while extracting the maximum possible real power from the wind. In this prototype system the reactive consumption was very high because the whole system and the control machine in particular were not specifically optimized forBDFIG operation. But the experimental setup has demonstrated that the BDFIG provides a wide range of operation, making it possible to maximize the power extraction with an appropriate MPPT algorithm.Some preliminary comparison of the simulation results of DFIG and BDFIG of identical power ratings also showed that the latter has the increased benefit of almost uniform efficiency throughout its operational range. However, further work is required to produce optimal design of a BDFIG, to reduce its size and maximize the efficiency [9], [10]
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