A Transient stability analysis method for power systems with wind turbines integrated based on fault information

Abstract

With the development of new energy， the integration of large-scale doubly-fed wind turbin units into the power systems have a great impact on the transient stability of the power grid. Therefore， a transient stability analysis method for power systems with wind turbines integrated based on fault information is proposed. This method incorporates fault information provided by protective relays into the transient stability judgment. Firstly， the external characteristics of the doubly-fed wind farm after faults and the negative-sequence and zero-sequence impedance models are analyzed. Subsequently， a system admittance matrix containing fault information is derived. Moreover， the EEAC （extended equal area criterion） is utilized to introduce a transient stability margin index， which serves as the basis for determining whether the system undergoes transient instability. Finally， the correctness and effectiveness of the proposed method are verified through simulation on a 3-machine 9-bus system containing doubly-fed wind farms.

Keywords

• transient stability
• asymmetric fault
• doubly-fed wind farm
• fault information
• eeac