A high temperature superconducting magnetic energy storage system (HT-SMES) is constructed using YBCO coated conductor and is integrated with a cryogenic system using sub-cooled LN2. A closed loop control algorithm, based on the digital signal processor (DSP) TMS320F2812, is proposed using the 2G HT-SMES to compensate dynamic voltage sag in power systems. A dynamic simulation experiment for compensation of instantaneous voltage sag is achieved. The experiment circuit is built using a signal conditioning circuit, a DSP controlling circuit, a power conversion circuit and a SMES unit. Analysis of the voltage waveforms before and after compensation validates that this SMES system is able to compensate instantaneous voltage sag.
Zhu, J., Cheng, Q., Yang, B., Yuan, W., Coombs, T. A., & Qiu, M. (2011). Experimental research on dynamic voltage sag compensation using 2G HTS SMES. IEEE Transactions on Applied Superconductivity, 21(3), 2126-2130. https://doi.org/10.1109/tasc.2010.2091710