B.I.L. Lopes

Tangent vector as a tool for voltage collapse analysis considering a dynamic system model

This paper discusses the implication of a dynamic system model for voltage collapse analysis. Some voltage collapse indices previously proposed in the literature are monitored under a static and a dynamic system model. The results are obtained using the IEEE 118 bus system. The indices behavior and load margin obtained for each model are analyzed.

Impact of Dynamic Thermal Limits of Transmission Lines on Power System Operation

This paper discusses a methodology to determine the ampacity of transmission lines based on their dynamic thermal limits. In this sense, temperature, wind speed, season conditions, and system loading are taken into account, rendering a methodology that determines, for each operating point and weather condition, the actual thermal limit of a transmission line. The proposed technique is tested in a real scenario and compared with the technique currently employed for this purpose.

Handling voltage collapse studies under a dynamic system model

This paper describes a computational tool to deal with transient and long term stability of power systems. The method proposed incorporates the transient and quasi- dynamic characteristics into a unified computational tool. During the transient simulation, the step size varies according to the classical trapezoidal method of integration, whereas bigger steps are taken during the long-term process. The set of equations considered, however, is always the same.