Control of unstable power swing using modified out-of-step tripping (ost) method /

Abstract

Disturbances in power systems are common and they result in electromechanical oscillations called power swing. The power swings could be harsh and may lead to loss of synchronism among the interconnected generators. This is referred to as out-of-step condition. The voltage and current swings during an out-of-step condition damage power system equipment and also cause unwanted operations of various protective devices. The protection systems require an effective algorithm for fast and accurate detection of out-of-step condition. This thesis deals with Out-Of-Step conditions in a network, how to detect the events and how to make improvements on the protection devices. To achieve this, the research has gone through two distinct stages: development of an algorithm and simulation using MATLAB and PSCAD. The thesis includes the development of an algorithm that can detect power swings. The algorithm is programmed in MATLAB. This algorithm detects faults in the system and predicts loss of synchronism.