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Nowadays, PMU (Phasor Measurement Units) technologies, as part of Smart Grids, have taken an important attention due to its ability to perform synchronous measurements in real time. With PMUs, it is now possible to measure online voltage angles at busbars of the Electrical Power Systems. From bus angles and other variables, new methodologies are being developed to quickly generate alarms; which may...
We study the transport properties of heterostructures of armchair graphene nanoribbons (AGNR) forming a double symmetrical barrier configuration. The systems are described by a single-band tight-binding Hamiltonian and Green's functions formalism, based on real-space renormalization techniques. We present results for the quantum conductance and the current for distinct configurations, focusing our...
In this paper, a new index is proposed to find further information on voltage stability of AC/DC systems and reactive power requirements. The index defines two types of systems from the point of view of voltage stability and reactive power variations, soft and non-soft systems. This approach can assist for considering the reactive compensation, control and operation strategies for AC/DC applications...
This paper exposes the feasibility to connect high voltage DC transmission (HVDC) systems to very weak AC networks leading to short circuit ratios (SCR) lower than 1.5. The existing literature does not provide solutions for such a low SCR systems and often the HVDC expansions cannot grow enough as expected. The studies developed are for the short-term voltage stability phenomena, where a solution...
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