A novel control scheme of the statcom for power quality improvement in electrified railways

DC electrified railways play an important role for metropolitan public transportation because of high efficiency, heavy ridership and fast transportation. However, the electrified railways cause great problems for the power quality issues of the power distribution system feeding the traction system such as injecting harmonics, reactive power compensation and low power factor issue. The problem can be solved by adding a Statcom to the traction substations. In this paper, a novel control system has been applied for the control of Statcom, comparing its efficiency and characteristics with the mostly used PQ method. The simulation is done with PSCAD/EMTDC proving the efficiency of the control system for reducing the current harmonics, voltage and current balancing, reactive power compensation and power factor improvement

Power quality concerns of unit commitment of main transformers for DC electrified urban railway systems

The power quality problems of DC electrified urban railway systems are discussed for the unit commitment situations on the main transformers of the traction substations. Utilizing unit commitment and the transformer planning procedure for an electrified traction system which is applied to derive the optimal transformer capacity to meet the annual peak demand and provide reserve for service reliability, minimizes the overall cost of main transformers over the life cycle. On the other hand, some power quality problems are caused or even emphasized due to the natural characteristics of the traction system. The dynamic programming method of unit commitment is done in MATLAB where its results are the input data for the rest of our power quality investigation procedure. The power quality characteristics of the traction system are then studied and verified through the simulation results done with PSCAD/EMTDC software

Induction motor characteristics and applications for DC electrified railway systems

Induction motor structures in DC electrified railways with their dynamic performance are studied. Characteristics of the current, voltage, electrical and mechanical torque and active and reactive power in accelerating, normal and regenerative braking are investigated. The characteristics of the induction motors used for Tabriz urban railway are simulated with PSCAD/EMTDC software proving the investigated characteristics

Power quality improvement of DC electrified railway distribution systems using hybrid filters

DC Electrified railways play an important role for metropolitan public transportation because of high efficiency, heavy ridership and fast transportation. However, the electrified railways cause great problems for the power quality of the distribution system feeding the traction system such as injecting harmonics, reactive power compensation and low power factor issue. These problems can be solved by using a hybrid filter in the traction substations. In this paper, a modified PQ control system has been applied for the control of shunt active filter, while the passive filters are used for reducing most of the severe harmonics. The simulation is done with PSCAD/EMTDC proving the efficiency of the proposed hybrid filter structure for reducing the current harmonics, voltage and current balancing, reactive power compensation and power factor improvemen

Power quality improvement of DC traction systems using STATCOM for locomotives with AC motors

No abstract availabl

PSACD/EMTDC based simulation of fault transients in AC electrified railways distribution system

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Load flow, short circuit fault transients and reliability of Tabriz urban railway

No abstract availabl

An efficient static VAR compensator for simultaneous elimination of voltage flickers and current imbalances of arc furnaces

No abstract availabl