The present invention relates to an electrical power system and provides a network security constraint of a processing system in a traditional optimized operation problem of electrical power system economic dispatching. The network security constraint comprises a branch power flow constraint, a static voltage stability constraint and a transient stability constraint, and provides an effective way for coordinating contradiction between economy and security. A security constraint economic dispatching method based on the security domains comprises a first step of respectively calculating an active static security domain boundary coefficient, a cut-set voltage stability domain boundary coefficient and a movable security domain boundary coefficient, a second step of building a security constraint economic dispatch model based on the security domains, a third step of utilizing social evolvement arithmetic based on cognition to work out the unit start-stop status optimization sub-problem, a fourth step of calculating power generation cost, static voltage stability margin and transient stability margin of each unit in dispatching cycle, and a fifth step of obtaining a feasible economic dispatching scheme, or returning to the third step. The security constraint economic dispatching method is mainly applied to electrical power load dispatching optimization.
SECURITY CONSTRAINT ECONOMIC DISPATCHING METHOD BASED ON SECURITY DOMAINS