A modified Ward equivalent based on sensitivity matrices for static security analysis

Abstract

This letter proposes a modified Ward equivalent method (M‐Ward) for the static security analysis of electric network. The M‐Ward develops the external to boundary sensitivity matrices to track the change of the operation condition in the external network. Hence, the M‐Ward can guarantee the accuracy of the equivalent network along with the condition change of the external network. Simulation studies of static security analysis conducted on the IEEE 39‐bus system demonstrate that the results of M‐Ward are more accurate than those of the classic Ward and the extended Ward method. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Static model of DFIG wind farms considering control strategies

“…However, it does not address how wind turbine equipment provides support within the internal network under transient conditions. In [6], an improved Ward equivalent method is presented, where Ward equivalence is carried out based on updated data from the external network, ensuring that the equivalent model can respond to changes in the external network. However, this method involves extensive computations and does not investigate the impact of new energy integration on equivalent models [7][8][9][10] .…”