Study on the Operation Characteristics and the Electrical Stress Extraction Method of VSC

Voltage Source Converter (VSC) is the ideal technology to realize large-scale new energy transmission. However, there are still deficiencies in the electrical stress extraction method for VSC converter valves. Herein, the VSC converter valve model is constructed. We present the transient and steady-state voltage and current stresses extraction method of the VSC converter valve. As a result, we have explored maximum operating current under steady state for the 4.5kV/5kA IGBT converter valve is 3.5kA, maximum steady-state operating voltage is 2.2kV, the maximum operating voltage in the commutator unlocked state is 3.4kV, and the continuity overvoltage in the commutator blocked state is 4.2kV. This promotes the further development of VSC projects.