Abstract
In the future global energy internet, electrical energy will be shared among the power grids with different frequencies, in which both the high voltage direct current (HVDC) and variable frequency transformer (VFT) can be used to achieve the asynchronous interconnection of power transmission. HVDC is widely used in long-distance power transmission, while VFT is more suitable for short-distance asynchronous interconnection, due to its inherent inertia for natural damping capability and large thermal time constant for high overloading capability, which can improve the stability and reliability of power grid. However, as common grid faults, three-phase voltage imbalances will cause serious torque and power fluctuations of the VFT, which will shorten the life of VFT and reduce the stability of power grid. In this paper, advanced configuration with double series compensation converters and control strategy of VFT under asymmetrical grid faults are proposed. Simulation studies are conducted to validate the effectiveness of proposed VFT configuration and control strategy.
Published Version
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