Calculation Method of Low Voltage Fault Short Circuit Current for Unmanned Ship Based on VSG Control
To ensure the stability and safety of energy storage devices integrated into the AC bus of a hybrid energy unmanned ship,virtual synchronous generator(VSG)technology is employed to control the energy storage devices.By performing transient analysis on the VSG after a symmetrical low-voltage fault occurs in the unmanned ship's power system,taking into account the differences between VSG and conventional synchronous generators in terms of power angle characteristics and current withstand capability,a new transient analysis method is proposed for VSG Additionally,the traditional short-circuit current calculation method is improved by introducing an iterative calculation method considering internal voltage variation,aiming to enhance the accuracy of short-circuit current calculation.Compared with the internal potential change,the short-circuit current calculated by this method is consistent with the theoretical value and the simulation value,and the error rate is less than 0.5％,which can provide an accurate reference for the subsequent protection setting of unmanned ships.
hybrid energy unmanned shipvirtual synchronous generator(VSG)low voltage faultshort circuit currentcalculation method
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