A New Fast Method of Assessing Transient Stability

A new fast calculation method of tie-line transmission power limit under transient stability is presented in this paper by studying the relationship among tie-line transmission power limit under transient stability, power impact in tie-lines from post-fault accelerating power and static stability power limit of post-fault power system. The method lays the foundations of above-mentioned relationship and it can assess transient stability power limits fast as well as transient stability margin. As the method relies on time-domain programs, it succeeds in being accuracy and free from simplifying assumptions about modelling. Furthermore, the main appeal of this approach is fast speed by comparing other methods. Technicians are able to assess transient stability using this method in order to save mass time for it is applicable to a multi-machine power system. Through practical case calculations, the proposed techniques have been proven to be able to fulfill the application requirements on stability, effectiveness and calculation efficiency, and could be widely applied in practical applications.