In a meshed multiterminal high voltage direct current (HVDC) system or a DC grid

it is difficult to control the power flow of a particular line by controlling the converter station. Therefore

it is necessary to use DC power flow controllers to improve the distribution of power flow. Firstly

the four types of existing DC power flow controllers are introduced and their advantages and disadvantages are analyzed. Then

a novel interline DC power flow controller is proposed. The new topology has the following advantages: fewer switching devices and drivers are required

the new topology has a simpler structure

and the control is simpler. Finally

a three-terminal HVDC system is built in PLECS

and the feasibility of the new topology is validated.