Voltage source type multi-level converter and control method thereof

The invention provides a voltage source type multi-level converter and a control method thereof, and relates to the technical field of electric energy conversion of power electronics, the converter at least comprises a phase bridge arm, and the bridge arm is formed by combining three direct current ends, two energy storage elements connected in series, an energy storage element voltage equalization circuit and an alternating current end; the three direct current ends are connected with two switches; the two switches are respectively connected with the anodes and the cathodes of the two energy storage elements which are connected in series, and the middle point of the connection of the two energy storage elements and the anode and the cathode of the whole are respectively connected with an alternating current end; an energy storage element voltage balancing circuit composed of a half-bridge circuit and an inductor is connected in parallel between the positive electrode and the negative electrode of the whole.