Study on transient overvoltages in converter station of MMC-HVDC links

Transient overvoltages in converter station equipment are difficult to predict using analytical tools, therefore it is conducted by means of EMT simulations. To obtain the worst case values, several HVDC set point configurations (active/reactive power set points) and fault locations inside the converter station must be simulated. In this paper, parametric studies using EMT-type software are conducted, in this paper to simulate large number of scenarios. A generic MMC based HVDC link and the impact of arm inductance location are considered. Transient overvoltages at each electrical node in the converter station are provided and analyzed. These results and studies provide insight for researchers and engineers who are involved in insulation coordination or transient study of MMC based HVDC link.