Application of PMU for system stability analysis with Thevenin equivalent modeling

This thesis is a continuation and verification of the proposed method to analyze power system stability by utilizing phasor measurement units (PMUs). In the past decades, industrialization has expanded rapidly around the world, and the demand for stable and reliable power sources has increased. Therefore, maintaining stable operation of the power system is an imperative and urgent issue. Voltage stability has become one of the major causes of power system outages and insecurity. We consider the problem of deriving an explicit approximation of the power system state by its Thévenin equivalent circuit. Rather than using simulators to model a power system, developing a Thévenin equivalent circuit for power grid enables a more reliable way to estimate the health of the system. As a continuation of the previously proposed conventional Thévenin method, a three-terminal Thévenin equivalent is used to model the power system. With the proposed Thévenin model, angle stability is presented as a change in the equivalent circuit. All methods are illustrated and applied in IEEE test cases and in real case studies conducted using Power World. The proposed methods serve efficiently and effectively in analyzing power system stability