Influence of Inverter Controller Parameters on the Small-signal Stability of LCC-HVDC System Based on a Practical Project

Unreasonable control parameters of the Line Commutated Converter based High Voltage Direct Current (LCC-HVDC) system may induce small-signal instability. This paper studies impact inverter controller on steady response LCC-HVDC under weak AC grid condition. Firstly, according to a practical project, model is established switching function. Then, eigen-analysis method adopted study side oscillation mode and damping characteristics LCC system, correctness results verified by PSCAD/EMTDC simulation. The conclusion shows that reasonable can improve stability margin system.