This paper proposes a fully digital control of boost Power Factor Preregulators (PFPs) with input voltage estimation. The proposed solution is based on a conventional multi-loop structure for PFP with an internal current control and an outer voltage control possibly with fast dynamic response. Instead, input voltage sensing is avoided by using a conventional PI (proportional-integral) current r...

In this letter, pronounced hysteresis loops were observed in single-walled carbon nanotube-based field-effect transistors CNTFETs . The shift in threshold voltage was found to increase with increasing gate voltage sweep ranges. A significant enhancement in the charge storage stability over 14 days was obtained at room temperature after a two-stage hydrogen and air annealing process was applied ...

This study proposed new method of improving voltage profile utilizing addition of inversed reduced Jacobian matrix elements vertically with the aim of determining location of reactive power compensation installation.This method is tested using actual network in Indonesia. In this analysis, enhancement of power system stability includes of voltage improvement and increase in stability index. By ...

The importance of preventing the voltage collapse is gaining importance due to increase in dependency on the use of electricity. This has compelled the utilities to maintain high system reliability. The evaluation of a power systems ability to withstand dangerous contingencies and to survive to a normal or acceptable operating point is a prerequisite for security analysis. Line outage often cau...

This paper presents a new and simple controller for transient stabilization with voltage regulation of a synchronous power generator connected to an infinite bus. The overall stability of the system is shown using Lyapunov technique. The design of the proposed controller takes into account the important non linearities of the power system model and it is independent of the equilibrium point. Si...

Over the years, high voltage transmission of large energy blocks over long distances has widely developed from Line Commutated Converter (LCC) technology. However, continuous expansion AC network and increase in renewable penetration leads to weakening Electric Power Systems (EPS), causing operational problems for LCC-HVDC. This paper evaluates degree contribution VSC-HVDC on LCC-HVDC dynamic p...

Abstract: This paper addresses the stability issue of the meshed DC distributed power systems (DPS) with constant power loads (CPLs) and proposes a stability enhancement method based on virtual harmonic resistance. In previous researches, the network dynamics of the meshed DC DPS are often ignored, which affects the derivation of the equivalent system impendence. In addition, few of them have c...

in this paper, the performance of two types of facts devices in order to enhance the power system static voltage stability has been investigated. these devices include static var compensator (svc) and thyristor controlled series capacitor (tcsc). the modeling of the single machine infinite bus (smib) and aforesaid devices has been made up in steady state mode with disregarding of the generator ...

Unified power flow controller (UPFC) is one of the most important flexible AC transmission systems (FACTS) devices in power systems. It has many applications such as stability enhancement, power flow control, voltage support, etc. In this paper UPFC is used in order to control voltage. In this scope, UPFC is installed on a specified bus and the voltage of the proposed bus is controlled by using...