Current converter module unit, current converter, DC power transmission system and control method

The present invention discloses a current converter module unit. The current converter module unit is characterized in that the anode of a first switch module is connected with the anode of a first energy storage element, and the cathode of a second switch module is connected with the cathode of the first energy storage element; the cathode of a diode is connected with the anode of the first switch module, and the anode is connected with the cathode of a second energy storage element and the cathode of a fourth switch module separately; the anode of the fourth switch module is connected with the cathode of a third switch module, and the anode of the second energy storage element is connected with the anode of the third switch module; the anode of the third switch module is connected with the anode of a fifth switch module, and the cathode of the fifth switch module is connected with the cathode of the second switch module. By the above structure, a good DC side fault ride-through performance can be provided, the limitation and insufficiency of the structures, such as a full bridge module, the clamping double modules, etc., are overcome, and the better economy and technology are both realized. The present invention also discloses a control method of the current converter module unit, a current converter, a DC power transmission system and a control method.