An Evaluation Method for Bus and Grid Structure Based on Voltage Sags/Swells Using Voltage Ellipse Parameters

Voltage sags and swells are significant issues of power quality. In order to alleviate voltage on sensitive loads, a method is proposed evaluate the bus grid structure based sags/swells using ellipse parameters. The matrix established for caused by four types short-circuit faults. can be converted into minor axis major Clarke transformation, accordingly sag swell obtained with interaction between key indicator vulnerability as well defined according matrix. buses sorted indicators proposed, result sorting provides basis selecting that need managed sags/swells. experiment results in IEEE 30-bus system 57-bus show these facilitate selection access point newly-added provide theoretical guidance mitigation swells, help accomplish planning, operation transformation grid.