Transient Stability and Long-Term Dynamics Unified

A digital computer program is described for the accurate, economic simulation of both the long-term and short-term dynamic response of an interconnected power system. The EPRI Transient/Mid-term Stability power system. The EPRI Transient/Mid-term Stability Program was enhanced to allow a long-term operating mode where integration steps out to one second can be used. The program automatically reverts to and from the short-term and long-term modes according to the short-term and long-term modes according to prevailing system conditions.