To restore the load voltage, dynamic voltage restorer (DVR), which installed between the supply and a sensitive load, should inject voltage and active power from DVR to the distribution system during voltage sag. Due to the limit of energy storage capacity of DC link, it is necessary the minimize energy injection from DVR. In this paper the techniques of the supply voltage sag compensation in a...

This paper deals with the real-time transient calculation for large systems simulation using multiple network equivalents. A mixed simulation involving a study system and three network equivalents is carried out in Matlab to demonstrate the simultaneous simulation. The transient calculation for the study system and each network equivalent used different time steps. A comparison between the resu...

Power Quality is a major concern within power industry and consumers. Poor quality of supply will affect the performance of customer equipment such as computers, microprocessors, adjustable speed drives, power electronic controllers, life saving equipment in hospitals, etc. and result in heavy financial losses to customers due to loss of production or breakdown in industries or loss of life in ...

Power system transient can cause serious damage to main power system apparatus and sensitive loads. There are many causes of power system transient including capacitor bank switching, switching of large inductive loads and lightning. This paper discusses the application of pattern recognition method, namely Support Vector Machine (SVM) to classify the cause of transient disturbance in power sys...

In this paper a new topology of flying capacitor based multicell converter with reduced switches has been introduced. Compared with conventional multicell converters (Flying Capacitor Multicell and Stacked Multicell converters), the proposed converter doubles the number of output voltage levels and the RMS of output voltage by canceling the midpoint of DC source while the number of high frequen...

Abstract: This paper is focused on the discussion and comparison of characteristics and behavior of three low frequency ac (LFAC) transmission system configurations operating under the same control scheme and conditions to identify the most promising operation system for LFAC. Merits of LFAC over high voltage direct current (HVDC) are mentioned first. By changing power flow direction without au...

The microgrid (MG) is a coordinated collection of different distributed generation (DG) typesthatsupply local demandthrough distribution network. MG may operate in two modes: grid-connected (GC), and islanded (IS)modes.The fault current valuevaries significantly between the GC IS mode for with inverter-based generators(IBDGs). currents are minimal owing to power electronics equipment have limit...

Fault location is not a trivial task in distribution systems, since the radial characteristic of feeders makes fault locators present multiple estimations (especially those based on impedance). In this sense, there difficult to accurately locate fault. Therefore, work presents decision tree-based approach reduce estimation issue. For purpose, feeder was divided into sectors, which do overlap. N...