Switching element, power converter, direct current transmission system, current control device, method of controlling power converter, and method of controlling current in voltage source converter

摘要

Problem to be Solved;A switching element of a power converter generates a low voltage, using a current flowing in the power converter, and supplies a power to drive itself.;Solution;A switching element 108 of a power converter for conversion from direct current into alternate current or from alternate current into direct current includes: a terminal 208 and a terminal 209 which are used in building the switching element 108 itself in the power converter; a capacitor 203, a high-side controllable switch 201H and a low-side controllable switch 201L enabling outputting the voltage of the capacitor 203, the voltage being output between the terminal 208 and the terminal 209, and a self-supply power source 206 for supplying a power to drive the bi-directional chopper switching element 108 itself, using a current flowing in the capacitor 203.