This paper describes the low voltage ride through (LVRT) capability of STATCOM using a star-connected modular multilevel converter (MMC). Under unbalanced grid conditions, the phase differences between each phase voltage of STATCOM are not 2π/3. In this case, the dc capacitor voltages diverge without a suitable control against the fault. In this paper, a LVRT control using zero sequence voltage injection is proposed to control the phase differences of the STATCOM output voltages to 2π/3. The proposed control method is verified experimentally.