Determination of moment for power system separation control action during an out-of-step condition

Studies aimed at the determination of timepoints that are favorable for the implementation of control actions are presented in the article. The formation of control actions with angle of transmission δ in the area of zero value is suggested for the devices of liquidation of out-of-step regime for this purpose. The developed method of determination of moment for power system separation control action is tested via COMTRADE oscillograms, which were obtained at digital-to-analogue physical complex OAO NIIPT.

I. Introduction

Out-of-step regime (OOS) in power system is one of the most severe emergency states. Given mode is related to loss of power stability, which imposes threat of damages of equipment, power shutdowns, undesired development of emergency state with severe consequences for interconnection in general as well as for its parts [1]–[4]. Therefore, development of sufficiently effective methods of detection and set up of necessary conditions for implementation of successful resynchronization (RS) is needed.