For large scale AC/DC transmission schemes with multiple series capacitors compensations, how to assess the risk of subsynchronous resonance (SSR) rapidly and efficiently is of great practical significance to ensure that the grid operates safely and stably. Taking the meeting summer peaks in 2009 of China Southern Power Grid as the practical project, by combining a static equivalence method, modified two point loadflow calculation which takes resistance into account, with frequency scanning method, the rapid risk assessment of SSR caused by mutiple series capacitors compensations in large scale power grid was realized. Then by using PSCAD/EMTDC, the detailed electromagnetic transient model (of course including the shaft model) was established to do the fault simulation certification aiming at generating units which have the risk of SSR. The analysis results showed that this rapid assessment approach works well and has strong practicability.
