Abstract
In a flexible DC distribution system, high frequency oscillation is easily caused by load disturbance, grid side filter parameter perturbation, distribution line length variation and DC filter capacitance perturbation. In this paper, a robust stability control method based on H∞ loop forming method and its standard mutual quality decomposition technology is presented. A simulation model of flexible DC distribution system is built, and the DC voltage stability differences before and after the introduction of the robust controller are compared and analyzed. The results show that the designed robust controller can effectively deal with the uncertainties and suppress the high-frequency oscillations of the system. Also, the feasibility and effectiveness of the proposed method are validated.
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