A NEW TECHNIQUE FORTHE DFIG’s RSC AND GSC CONVERTERSTO REJECT DC LINK VOLTAGE RIPPLE
Abstract
This paper presents a new control strategy to reduce the fluctuation of DC bus voltage for a back-to-back PWM converter in a DFIG wind turbine systems. DC-link voltage Feed-forward compensation control strategy for DFIG’s RSC and GSC converter is proposed to limit the fluctuation range of the dc-link voltage. The dynamic performances of the DFIG are compared with the traditional control method. Furthermore, the capabilities of keeping the dc-link voltage stable are also compared in the ride-through control of DFIG during a three-phase grid fault, by using a developed 2 MW DFIG wind power system model. The simulation results have shown that the proposed control strategy is more effective, and the fluctuation of the dc-link voltage may be successfully limited in a grid fault .
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