An improved voltage stability assessment for power system with HVDC

In order to prevent voltage collapse, lots of voltage stability assessments are proposed to search weak buses. However, these assessments are either only related to network topology or time-consumed. Therefore, voltage stability extended voltage sensitivity factor (EVSF), an improved voltage stability assessment considering voltage regulation of generator and HVDC, is given and derived in this paper. And a case is illustrated and analyzed. Comparing with VSF indicator, EVSF is more considerate and sensitive to discover weak buses with multi-infeed HVDC. It's proved that EVSF is an effectiveness assessment for power system voltage stability analysis.