Comparison between direct and vector control strategy for VSC-HVDC system in EMTP-RV

This paper presents a detailed comparison of direct and vector control strategies for a Voltage Source Converter (VSC) operated HVDC transmission system. The system is, simulated with EMTP-RV simulation package, to investigate its operational performance. The simulation results with both control strategies shows a satisfactory performance under steady state behaviour, but, due to cross-coupling between the control parameters direct control technique is unable to provide independent control of active power, reactive power and AC voltage. This can provide non-optimal recovery behaviour under transient and dynamic conditions. The simulation results provided validate the vector control strategy for optimal independent control of system parameters such as active and reactive power during transient and steady state operation.