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Among the third world countries from Asia and Africa, power quality is one of the biggest problem still persists because unaffordable high tech solutions. Voltage control problem due to an adequate reactive power compensation and its improper control results in frequent cascade tripping of electrical supply system. In this paper efforts are made to provide a low cost solution to provide exact reactive...
The vacuum interrupter is generally accepted as reliable circuit breaker in the medium voltage power system , but the operating thoroughly a high inductive loads and capacitive loads caused a significant damages with severe erosion in the surfaces both of cathode and anode vacuum Interrupter . This paper remedies both of arcing currents, chopping currents and prevents a high transient voltages (TRV)...
In this paper the commutation mechanism based on LV mechanical circuit breaker and parallel semiconductor device is discussed. This hybrid switch comprises electromechanical relay connected in parallel with semiconductor branch controlled by microprocessor unit. The work presented herein covers both laboratory experiments as well as EMTP-ATP simulations, where modeling of electric arc behavior was...
In order to eliminate power conversion steps, future micro grids with renewable energy sources are being visualized as dc power systems. System components such as sources (solar panels, fuels cells, etc.) loads, and power conversion have been identified and are readily available. However, when it comes to dc circuit breakers, many designs are still in the experimental phase. The main limitation is...
In this paper, a novel ultra-compact, self-powered, high-efficiency, solid-state electronic device to reduce the energy consumption and improve the power factor at light load of direct-on-line, variable-torque, fixed-speed, three-phase, squirrel-cage induction motors, by means of a novel load-based stator-winding connection-mode management technique, is presented, including some technical and economic...
Transmission line congestion is a critical factor that will affect power system operational cost. With more renewable energy in the future grid and the intermittence of nature, transmission line congestion will be more frequent. Due to the congestion, renewable plant has to curtail some available generation. This paper investigates the use of active transmission line switching operation in power system...
This paper presents a comparison of the performances related to compensation and transient response of active and passive power filters when operation relies on distorted mains voltages. MATLAB/Simulink models are used. Measurements acquired with a dedicated data acquisition system provided the parameters required by the real system simulation, namely a static excitation system of a power generator...
This paper proposes a solution that employs transistor self-conduction and circuit design techniques to improve ESD performance for SOI RF switch applications. The primary limitations and challenges in the ESD design for SOI technology are discussed. The solution enables the switch to pass 8kV IEC as well as typical HBM standards.
In the capacitor-based pulsed power supplies (PPS), the tabulate thyristor combination is usually used as the powerful discharge switch, and tabulate rectifier diode combination as the crowbar diode. Based on discuss of the discharge process of the PPS, emphasize on analysis of the invalidation example of the powerful devices then the method how to choose parameters of the powerful devices in PPS...
One of the most common problems in sparsely connected power systems is the reduction of power transfer capabilities, due to voltage stability problems. They usually appear in electrically distant and poorly compensated parts of a power system with concentrated consumption. This paper presents one approach to solve the voltage issues, by introducing FACTS devices, like Static Var Compensators (SVC)...
The EAST superconducting tokamak is an advanced steady state experimental device being built at ASIPP in China from 2000 to around 2006. The paper gives a description for the power supply (PS) of poloidal field (PF) in EAST. Design and test results for the thyristor switch network are emphasized with transient analyses.
CuO/gamma-Al2O3 granular catalysts were synthesized by the sol-gel method. Performance of the CuO/gamma-Al2O3 catalysts for the selective catalytic reduction (SCR) was explored in a fixed bed adsorption system. The optimum temperature ranges for SCR of NO over the fresh CuO/gamma-Al2O3 catalyst are 250~450degC. The maximum activity maintains near to 99% at 350degC. The operating temperature range...
The static synchronous series compensator (SSSC) is a new series compensator equipment of the FACTS family. Compared to the Thyristor Controlled Series Compensation (TCSC) which is in common use, the SSSC has wider control range and faster response speed. The study and comparison on their transient control behavior has much to do with the stability of the power system and the setting of relay protection...
The integration of a 10-kV-IGCT and a fast diode in one press pack is a very attractive solution for medium voltage converters in a voltage range of 6 kV - 7.2 kV if the converter power rating does not exceed about 5 - 6 MVA. This paper describes the design and characterization of the world first reverse conducting 68 mm 10-kV-IGCTs. On-state-, blocking and switching behaviour of different IGCT and...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
This paper presents thyristor controlled series compensation by adjustable coupling, a novel method of thyristor controlled series compensation. The concrete device connection scheme and line power regulation characteristic of this method are obtained by analyzing the controlled reactance characteristic and adjustable principle of thyristor controlled reactance by adjustable coupling. This paper analyzes...
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