Analysis of Additional Damping Control Strategy and Parameter Optimization for Improving Small Signal Stability of VSC-HVDC System

The voltage source converter based high direct current (VSC-HVDC) system is on converter, and its control more complex. Also affected by the fast of power electronics, oscillation phenomenon in wide frequency domain may occur. To address problem small signal stability VSC-HVDC system, a strategy designed to improve stability, risk reduced attaching damping controller optimizing parameters. Based modeling general architecture inner outer loop established; controllers for DC AC are phase-locked parts respectively; state-space state model established analyze performance. And electromagnetic transient simulation built PSCAD/EMTDC platform verify accuracy model. influence parameters each part summarized. main affecting optimized due changes operation mode occurring side faults other reasons, which effectively eliminates improves providing certain reference engineering design.