Transient reactive power characteristics of HVDC during commutation failure and impact of HVDC control parameters

HVDC commutation failure and recovery, the reactive power exchanged between HVDC and AC systems will change largely, showing the external characteristic of ‘large capacity reactive impact load’, so it is quite necessary to carry out studies on this problem. In this study, first, the HVDC sending‐side and receiving‐side reactive power equations in steady state and transient process are given. Second, the HVDC sending‐side and receiving‐side reactive power characteristics during commutation failure and recovery are analysed. Finally, the impact of the HVDC control system parameters is studied. All the contents are verified by simulation of the HVDC equivalent case system.