A novel controlling method for the superconducting magnetic energy storage system as a distributed generation source; full modelling, design and simulation

Abstract

In this article, a novel controlling method applied on the superconducting magnetic energy storage (SMES) system, as a distributed generation source, has been proposed. The structure comprises an SMES coil, a three-level bi-directional chopper, a three-level inverter, fuzzy logic-based controlling units, and appropriate interfacing filter and circuitry components. The system can operate both in connected and disconnected cases. In the former, power exchange occurs between the distributed generation source and the power grid; and in the latter, the system will supply the local load independently. Hence, active and reactive power in the connected case, and load voltage in the disconnected case are controlled by three individual fuzzy logic-based controllers. Effectiveness and efficiency of the proposed structure have been verified by a series of relevant simulations.

Keywords:

• bi-directional-three-level chopper
• fuzzy control