Transient stability versus damping of electromechanical oscillations in power systems with embedded multi‐terminal VSC‐HVDC systems

Multi-terminal high-voltage direct current technology based on voltage-source converter stations (VSC-MTDC) is expected to be one of the most important contributors future electric power systems. In fact, among other features, it has already been shown how this can contribute improve transient stability in systems by use supplementary controllers. Along line, paper will investigate detail these controllers affect electromechanical oscillations, means small-signal analysis. The analyses two control strategies modulation active-power injections (P-WAF) and reactive-power (Q-WAF) VSC which were presented previous work. Both global signals frequencies VSC-MTDC system they significant improvements stability. provide guidelines for design type both large- small-disturbance angle Small-signal analysis (in Matlab) compared with non-linear time domain simulation PSS/E) confirm results using CIGRE Nordic32A benchmark test a system. impact controller gains communication latency electromechanical-oscillation damping. main conclusion that transient-stability-tailored tuned damp inter-area oscillations too, maintaining their effectiveness.