A Method of PI Parameters Tuning for VSC-HVDC Control System

High voltage direct current technology based on voltage source converter (VSC-HVDC) has such advantages as no commutation failure and no reactive power compensation. Because direct current control strategy is generally applied in VSC-HVDC, PI regulator is used for series correction in the inner current loop control, outer power and voltage loop controls. Therefore, it plays a vital role for improving control system performance if appropriate method would be utilized to design PI controller parameters. A kind of parameter tuning method is presented in this paper by considering such indexes as the steady-state error, the rising time, the anti-disturbance performance of the control system performance, by which the inner current loop, outer power and DC voltage loop are designed as classic I type link, classic first-order link and classic II type link respectively to ensure the control system having good steady-state and dynamic performance. In the end, the validity of VSC-HVDC system model is verified by PSCAD / EMTDC simulation.