Direct current control strategy of SMES current source converter—Design and simulation

This paper is concerned about the control strategy of current source converter(CSC) for a superconducting magnetic energy storage system(SMES).First,the CSC topology is improved to simplify traditional tri-logic PWM control structure.A direct current control strategy is then proposed on the basis of PRD(proportional-resonant-derivative) control.The PRD control method is able to achieve zero steady-state error of AC component and high system response speed through increasing the system damping,thus enabling the control of power transfer between the SMES and the grid.Theoretical analyses and MATLAB simulations verify the high dynamic and steady-state performance of the proposed PRD control strategy.