Application of power swing equation for the estimation of power imbalance

Abstract

Electric power system is always subjected to different types of disturbances due to overload, tripping of generators, fault occur at any section of power system. Due to these disturbance, the system frequency will change and the power system becomes unstable which may lead to major blackout if not recovered quickly. In order to maintain the frequency, conventional under frequency load shedding scheme is commonly used. However, it has the problem that it does not estimate the power imbalance and lead to un-optimal load shedding. The result is either overshedding, which affects power, or under-shedding, which leads to tripping of electricity service. In order to address this issue, this thesis proposes a power imbalance estimation module (PIEM) to accurately estimate the power imbalance in the power system that can be used provide efficient and reliable operation of power system under severe disturbances.