The control flexibility of the power inverters that interface distributed generation can be exploited to incorporate quality enhancement features in addition usual management control. This article presents a novel scheme achieves voltage balance at any node an ac microgrid regardless impedance value network. collaborative strategy is devoted set specific sharing balancing currents, thus avoidin...

The main objective of this tutorial is to present the basic concepts on the instantaneous p-q Theory and them show its applicability for controlling switching converters connected in a micro-grid. These converters can be used for connecting renewable energy sources (solar, wind, and others) to the microgrids or for harmonic, reactive power or unbalance compensation, and even for voltage regulat...

Author Affiliation: Institute for Power, Electronics and Telecommunications Engineering, Faculty of Engineering, University of Novi Sad, Novi Sad, Yugoslavia. Abstract: The aim of this letter is to present a universal power quality conditioning system (UPQS) named after unified power quality conditioner (UPQC), which is extended by adding a shunt active filter at the load side. Its main purpose...

A power factor correction (PFC) plays a major role towards the improvement of systems quality and stability, as well protection control performance. This paper presents novel method for automatic (APFC) based on coherence approach. In this method, original required reactive compensation can be determined using cross-coherence coefficients evaluated between voltage current signals. Beside auto-c...

This paper examines the proper application of three phase induction motors when supplied by unbalanced voltage. To analyze the effects of unbalanced voltage on torque of the induction motors, it has defined 32 unbalanced points, with 8 different types of voltage unbalance, and four levels of Voltage Unbalanced Factor, measured with Symmetrical Components method. In each unbalanced point the Tor...

Voltage sags can be symmetrical or unsymmetrical depending on the causes of the sag. At the present time, one of the most common procedures for mitigating voltage sags is by the use of dynamic voltage restorers (DVRs). By definition, a DVR is a controlled voltage source inserted between the network and a sensitive load through a booster transformer injecting voltage into the network in order to...

This article proposed a novel topology of dynamic voltage regulator using transformer and PWM multi-level AC/AC converter. In this paper for finding the best value of duty ratio for switches to minimize the THD, the GA algorithm has been used and THD output voltage is assumed to be fitness function. The proposed voltage regulator employs multi-level AC/AC converter to generate compensation volt...

This paper aims to present a simulation model for the analysis of operational characteristics electric motors (EMs). The was developed on Simulink platform MATLAB program and allows in supply conditions with harmonics voltage unbalance. contribution is that it considers mechanical losses provides study effect each component electrical sequence unbalance electromechanical EM. tested 37.3 kW EM, ...

The authors report the development of the laboratory model of a microcontroller-based Static Var Compensator (SVC). A prototype of an automatically controlled voltage balancer using thyristors valves to switch the capacitors and inductors has been investigated. A digital control scheme incorporating a microcontroller is developed. At each sampling time, the loading conditions are measured by a ...