Control Strategy Of Superconducting Energy Storage Devices Based On Current-Source Power Conditioning System

Due to randomness and intermittence of distributed generations,the power quality is difficult to meet the needs of users.Especially when the microgrid is running in the island state,the change of the DG' output will cause the voltage fluctuation of the point of Common Coupling(PCC).Superconducting Magnetic Energy Storage(SMES)is considered to be an effective device to solve aforementioned problem.In this paper,a renewable energy microgrid with SMESs based on current-source power conditioning system(PCS)is considered and mainly does the following work:1.Aiming at the problem caused by randomness and intermittence of distributed generations,an overall control strategy of SMES based on DG current feedforward is presented.which can effectively track the change of DG output and control the SMES four-quadrant based on Current-Source PCS to adjust the active power and reactive power to improve the stability of distributed microgrid voltage.2.For the case of multiple distributed SMES autonomous parallel operation,a distributed SMES parallel autonomous operation collaborative control strategy is proposed to control multiple SMES four-quadrants based on Current-Source PCS to adjust active power and reactive power.3.Using the fuzzy control strategy to manage the operating current of the SMES coil,so that the operating current of each SMES coil works within a suitable range;And using the fuzzy control strategy to sharing the current of the SMES coil's operating current,when two distributed SMES autonomous parallel operation.4.The corresponding simulation model is built on the platform of Matlab/Simulink,and the above theoretical research results are verified by simulation.