Research on Influencing Factors of voltage control for MMC type mobile DC ice melting device

The mobile DC ice melting device based on full bridge MMC has the advantages of modularization, strong scalability, high redundancy and wide range of DC voltage generation, which is suitable for solving practical engineering problems such as line icing. In addition to deicing, this kind of device can move flexibly and has the potential of voltage support similar to STATCOM. It is also suitable for solving voltage sag caused by fault or load change. This paper first analyzes the working principle of MMC in the mobile ice melting device, and then puts forward the specific control strategy when the device is used as STATCOM; then studies the influencing factors of MMC mobile DC ice melting device voltage governance; finally establishes a simulation model for verification. When the short-circuit capacity of the configuration point of MMC mobile DC deicing device is determined, the reactive power required by the support voltage is only linearly related to the sag amplitude; when the sag amplitude is fixed, the reactive power required by the support voltage is only related to the short-circuit capacity of the configuration point; the voltage governance is less affected by the load capacity.