1677 results about "Voltage stability" patented technology

The 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 dispatch. 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 dispatch 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 evolutionary programming based on cognition to work out the unit start-stop state optimization sub-problem, a fourth step of calculating out 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 dispatch scheme, or returning to the third step. The security constraint economic dispatch method is mainly applied to electrical power load dispatch optimization.