The previous thyristor rectifier based DC ice-melting equipment consumes too much reactive power and brings about characteristic harmonics

which further affects the AC system stability. The full-bridge modular multilevel converter(MMC)

with its ability of outputting bidirectional DC voltage and DC current

can meet the demand of DC melting on operation conditions of converters. This paper focuses on the control strategies for DC ice-melting equipment for full-bridge MMC. First

the operation principle of the main circuit topology of DC ice-melting equipment based on full-bridge MMC is described

and the modulation ratio definition applied in full-bridge MMC is given. By taking advantage of the full-bridge sub-module(FBSM)ability of outputting positive

zero and negative capacitor voltages

the zero-initial voltage and current boosting of the full-bridge MMC is analyzed to satisfy the de-ice demands of different types and lengths of AC conductors. At the same time

the AC side voltage of full-bridge MMC should be made to remain satisfactory and almost sinusoidal even when the DC voltage is very low. Considering the capacities for var compensation

facility utilization and element redundance

the topological structure of the ice-melting equipment in the reactive compensation mode is determined. Finally

an electromagnetic transient model of DC ice-melting equipment is developed on PSCAD/EMTDC and the results have verified the effectiveness of the proposed control strategies.