Constant extinction angle control is usually used in the inverter control strategy of HVDC system

and the performance of closed-loop constant extinction angle control relies on the extinction angle calculation method.The concept of using valve voltage to calculate extinction angel is simple. In this paper

the principle of extinction angle calculation method based on valve voltage and the combination of the method with the closed-loop PI control are elaborated

and an extinction angle calculation model is built up in the software PSCAD. The proposed model is applied to the PSCAD’s COGRE standard control system to conduct steady-state and fault simulations

and the results are compared with that of the corresponding model existing in PSCAD. It is concluded that the proposed valve voltage-based extinction angel calculation method achieves good static control characteristics

and has certain protective function in fault condition. However

its HVDC response characteristics are not satisfactory but the effect on overvoltage is small. As a result

the proposed method can be applied to calculation of overvoltage.