Intelligent autonomous control of a unified power flow controller

Intelligent autonomous controllers are advanced level controllers with an ability to self govern their control functions. The self governing capacity includes adaptation to environment changes and internal failures in control functions without external intervention. Control functions therefore require proper coordination between several controllers in a system and the built-in intelligence to accommodate for various contingencies. In this paper, a hierarchical autonomous controller has been designed for special power flow control equipment called the unified power flow controller (UPFC). The performance of the UPFC with an autonomous controller has been studied on a single-machine infinite bus power system. A single contingency has been evaluated and proper intelligent action is incorporated into the controller to maintain power system stability