High-voltage direct-current power transmission system based on hybrid commutation converter and control method of high-voltage direct-current power transmission system

The invention discloses a high-voltage direct-current power transmission system based on a hybrid commutation converter and a control method of the high-voltage direct-current power transmission system, a receiving-end hybrid commutation converter is formed by connecting two Graphite bridge converter valves with the same structure in series, and each phase outlet of the converter valves is connected with a current-limiting inductor in series and connected with a filter capacitor in parallel; each converter valve comprises three bridge arms which are connected in parallel, and each bridge arm is formed by connecting an upper converter valve arm and a lower converter valve arm which are the same in structure in series; and each converter valve arm is formed by connecting m thyristors and n reverse blocking type IGCTs in series. When a receiving end power grid is normal, power grid voltage is used for natural commutation to reduce loss, when the power grid fails, the reverse blocking type IGCT is actively turned