Received Jan 9, 2018 Revised Mar 2, 2018 Accepted Mar 18, 2018 The objective of this paper is to predict the secure or the insecure state of the power system network using a hybrid technique which is a combination of Artificial Neural Network (ANN) and voltage stability indexes. Voltage collapse or an uncontrollable drop in voltage occurs in a system when there is a change in the condition of t...

Voltage stability is a major concern while designing a foolproof power network. In recent years deregulated environment put an additional pressure on transmission and distribution utilities. With this fact assessment of voltage stability along with the preventive control actions are major area of research. With this motivation, this paper presents assessment of voltage stability through Global ...

6 Directions in automated software for large dynamic models 61 6. 7 A new mechanism leading to oscillations 67 7. 8 Oscillatory precursors to angle/voltage collapse and the Hamiltonian approximation 90 8.1 Structural features of linearized models for electromechanical dynamics. .. 91 A Detail of 3 bus and 9 bus models and test cases 117 A. B Detail of 37 bus model and base case 121 B.

MetalInsulatorDoped semiconductor FieldEffect Transistors (MIDFETs) in which the InGaAs channel is heavily doped but the InAIAs insulator is undoped were pioneered by del Alamo and Mizutani at NTT Laboratories.1 These devices have been found to display a performance comparable to InAIAs/InGaAs ModulationDoped FETs (MODFETs) of similar gate length. They additionally offer unique benefits not fou...

Power systems form one of the largest and most complex technical systems. Changes of load parameters may lead to so called bifurcations, resulting in nonlinear phenomena like voltage collapse or interarea oscillations. Special software tools are able to simulate these systems and to identify bifurcations. This paper presents a systematic approach to determine gain factors of Flexible AC Transmi...

Recovery transients following blocking-state voltage stress are analyzed for two types of AlGaN/GaN HEMTs, one set of devices with thick AlGaN barrier layers and another with recessed-gate geometry and ALD SiO2 gate dielectric. Results show temperature-invariant emission processes are present in both devices. Recessedgate devices with SiO2 dielectrics are observed to exhibit simultaneous trappi...

Recent developments in the design and manufacture of microcomputers together with improved simulation techniques make it possible to achieve the speed and accuracy required for the dynamic simulation of power systems in real time. This paper presents some experimental results and outlines new ideas on hardware architecture, mathematical algorithms and software development for this purpose. The ...

A recently developed Lyapunov (energy) function incorporates both generator and load dynamics. This paper reviews that energy function. Its use in the assessment of the stability of power systems where generator and load dynamics are active is presented. Further, generator/load interaction is explored. This new energy function allows for direct assessment of (dynamic) voltage collapse scenarios...