MMC-Based PV Grid-Connected System With SMES-Battery Hybrid Energy Storage System

The unstable nature of output power of photovoltaic (PV) arrays brings harmonic pollution to the power system. Superconducting magnetic energy storage (SMES) is a kind of energy storage device with low loss and long life. It is used in combination with battery to make full use of the advantages of large energy storage capacity and large power density, which is conducive to the stable operation of PV grid-connected system. Modular multilevel converter (MMC) with advantages of less harmonic pollution and low voltage of single device has potential to better suit the PV grid-connected system. In this paper, an MMC-based PV grid-connected system with SMES and battery is studied to improve the PV grid-connected system.