With the progress of power electronic devices in electric railway, harmonics in power systems become increasingly of concern. This paper presents a case study on harmonics in a traction power supply system. The study was based on measurements realized in an electrical drive station using a data acquisition system and a computer. It was analyzed the main power quality indicators: the power facto...

Power Electronic Converters are commonly used in different applications because of high efficiency and low cost. Due to latest advancement in semiconductor devices it is difficult to draw the boundaries for applications of power electronic topologies. These topologies are variable structure systems and generate harmonics during the operation which will affect the power quality when are connecte...

Ever growing demand for efficient and high quality teleand data-communication power systems have driven the replacement of centralized power supplies with distributed architectures. Recently, a new Intermediate Bus design has gained popularity by providing lower cost, superior power quality, and higher efficiency while taking advantage of the newest advances in power components. This topic prov...

Harmonic current pollution is a one of the major power quality problem in electrical power systems. In office buildings one of the main harmonic sources is a large numbers of computer loads. Especially, personal computers apply harmonic distortions to their power supply systems. In this study, harmonics models of equipments, a MATLAB ® code and single-phase Simulink simulation models are develo...

The recent trend of distributed generation leads to several issues regarding power quality and energy efficiency. To meet the increased demand of electricity services and to increase service quality the current power grid structure should be controlled in such a way that distributed generation could be easily connected to it. The various services are becoming challenging concern to elegantly in...

Due to the wide spread of power electronics equipment in modern electrical systems, the increase of the harmonics disturbance in the ac mains currents has became a major concern due to the adverse effects on all equipment. Power electronic converters are commonly used for interfacing distributed generation (DG) systems to the electrical power network. However, the unbalanced voltage compensatio...

distributed generations (dgs) are utilized to supply the active and reactive power in the transmission and distribution systems. these types of power sources have many benefits such as power quality enhancement, voltage deviation reduction, power loss reduction, load shedding reduction, reliability improvement, etc. in order to reach the above benefits, the optimal placement and sizing of dg is...

In Japan, the Great East Japan Earthquake and the subsequent tight power supply, introduction of a feed-in tariff (FIT) scheme, and power system reform have caused dramatic changes in Japan’s power systems. These changes led to acceleration in the introduction of solar power and other renewable energies, an increase in the number of the new power suppliers, and reinforcement of interconnections...

With the aid of power quality monitoring systems (PQMSs), accurate locating of voltage sag sources, which has important significance for guiding maintenance personnel in finding and repairing faults as well as improving power supply reliability, has been becoming a new research hotspot. However, existing methods have unsatisfactory locating accuracy due to the integration of distributed generat...