Research on Superconducting Magnetic Energy Storage Based on Dynamic Voltage Restorer

This article studies superconducting magnetic energy storage(SMES) based Dynamic Voltage Restorer(DVR).It connects the SMES to the DVR by a DC-DC converter,to supply the energy for the DVR at working.The circuit configuration is analyzed and researched.It takes PI regulator as the control method of charge and discharge of the energy storage system.When it works in charge mode,the current of the superconducting winding is maintained at a fixed value.And when it works in discharge mode,the voltage of the DC bus is maintained at a fixed value.This method can overcome the disadvantages such as interfluence of the environment and parameter change of the system,and can realize the high-speed energy flow between SMES and DVR.In the DVR part,dq change is adopted to check and control the work condition,to achieve the fast control.Then simulation is made to analyze the situation of this SMES based on DVR when the fault of the voltage sag happens.The simulation results indicate that the SMES has advantages of high energy density and high speed of energy flow.And this SMES based on DVR can compensate the voltage sag rapidly and effectively,to maintain the voltage of sensitive load.