Design Method of Modular Multilevel Real-time On-line Anti-icing and Ice-melting Equipment Based on Self-ice-melting Conductors

The equivalent circuit of self-ice-melting conductor contains large capacitance components and inductance components. When applying alternating current ice-melting power supply, capacitance components and inductance components will consume a large amount of reactive power. In order to avoid reactive power consumption, direct current ice-melting power supply is needed. While the aluminium strand of the self-ice-melting conductor conveys alternating current power, and the steel core voltage is the sum of aluminium strand voltage and a fixed voltage, the voltage difference between the steel core and the aluminium strand will be direct current. The secondary side of alternating current transmission transformer is designed with transmission winding and ice melting winding. The transmission winding is used to generate transmission power and connect to the aluminium strand. Two modular multi-level converters are connected with the ice-melting winding. The first modular multi-level converter converts the output voltage of the ice-melting winding to direct current, and the second modular multi-level converter converts direct current to the sum of the voltage of the aluminum strand and the fixed voltage. By the designed method of this paper, direct current power supply for ice melting can be generated between steel core and aluminium strand to restrain the reactive power consumption.