Abstract
Small-disturbance voltage stability is of great significance for microgrid. To improve the small-disturbance voltage stability of microgrid including doubly fed induction generator (DFIG), DFIG reactive power control uses Q/V droop control and the integral logic loop. The reactive power limit corresponding to the DFIG active power in the case of variable wind speed is calculated, so that the integral logic loop and the Q/V droop control are limited. This paper finds the typical eigenvalues reflecting the voltage response characteristic of the microgrid via the small-signal analysis method. The influence on the locus of typical eigenvalues with DFIG different reactive power droop coefficient is analyzed. Through the parameter improvement, the adjustable range of DFIG reactive power droop coefficient is enlarged and the small-disturbance voltage stability of microgrid gets better. Finally, this paper establishes the microgrid model using the software DIgSILENT/PowerFactory. Simulation results verify validity and effectiveness of the proposed control strategy.
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