A Control Strategy of Levelling Load Power Fluctuation by Using Superconducting Magnetic Energy Storage

If a small capacity of superconducting magnetic energy storage (SMES) is developed, it can be expected that the SMES equipped near to the consumer levels the load power fluctuation and compensates the reactive power rapidly. It leads the effective use of the power facilities. In this paper, the authors propose the control strategy of the SMES for levelling the load power fluctuation and compensating the reactive power. Then, the validity of the proposed method is discussed by simulation. The obtained results are summarized as follows. (1) The control method of the SMES is proposed with the estimation function taking account of the energy stored in the SMES and the levelling of load power fluctuation. (2) The region of the proper weighting factors of the estimation function and the exponential smoothing method are obtained for the load power fluctuation. The levelling of the power following the sustained component of the load power fluctuation can be achieved by using the obtained weighting factors. (3) The effects of the energy capacity and the current ratings of the SMES on the levelling of the load power fluctuation and the compensation of the reactive power are clarified.