Fast and accurate frequency estimation of an unbalanced three-phase power system in the presence measurement offset is a challenging task. A simple to implement tune method proposed this work through delay-based linear-regression framework. Using two scenarios, we verify performance our procedure severe grid abnormalities, including voltage unbalance, harmonics, jump, dc offset. Comparative har...

Unlike traditional AC distribution systems, protection has been challenging for DC systems. Multi-terminal DC power systems do not have the years of practical experience and standards that AC power systems have. Also, the current power electronic devices cannot survive or sustain high magnitude faults. Converters will shut down to protect themselves under faulted conditions. This makes locating...

In this paper, a new control strategy is proposed for implementation in low-voltage microgrids with balanced/ unbalanced load circumstances. The proposed scheme contains, the power droop controllers, inner voltage and current loops, the virtual impedance loop, the voltage imbalance compensation. The proposed strategy balances the voltage of the single-phase critical loads by compensating the im...

Development of distributed generations’ technology, trends in the use of these sources to improve some of the problems such as high losses, low reliability, low power quality and high costs in distributed networks. Choose the correct location to install and proper capacity of these sources, such as important things that must be considered in their use. Since distribution networks are actu...

Amplitude-phase information of the voltage/current phasor, which is prerequisite for grid-tied converter control and protection, can change almost instantaneously in low-voltage distribution systems with small X/R ratios. However, equivalent impedances high-voltage power are usually inductive (with large ratios), flow pertinent grids generates decaying dc (DDC) components amplitude long duratio...

1 Power Electronics and Industrial Control Laboratory, University of Sétif1, Sétif 19000, Algeria 2 Department of Electronics, University of Msila, Msila 28000, Algeria; E-Mail: [email protected] 3 Department of Electronics, University of Sétif1, Sétif 19000, Algeria 4 Department of Electrotechnics, University of Sétif1, Sétif 19000, Algeria; E-Mail: [email protected] 5 Department of Electr...

In recent years, renewable energy sources have been considered the most encouraging resources for grid and off-grid power generation. This paper presents an improved current control strategy for a three-phase photovoltaic grid-connected inverter (GCI) under unbalanced and nonlinear load conditions. It is challenging to suppress the harmonic content in the output current below a pre-set value in...

In this paper, we apply the PQ theory with shunt active power filter in an unbalanced and distorted power system voltage to compensate the perturbations generated by non linear load. The power factor is also improved in the current source. The PLL system is used to extract the fundamental component of the even sequence under conditions mentioned of the power system voltage. Keywords—Converter, ...

This paper deals with the performance analysis of static compensator (STATCOM) based voltage regulator for self excited induction generators (SEIGs) supplying balanced/unbalanced and linear/non linear loads. A threephase insulated gate bipolar transistor (IGBT) based current controlled voltage source inverter (CC-VSI) known as STATCOM is used for harmonic elimination. It also provides the requi...

The doubly fed induction generator (DFIG) and back-to-back converter are very sensitive to power quality disturbances in grid-connected wind energy conversion systems (WECSs). Special attention has been given protect the system from voltage sags, considering introduction of several low-voltage ride-through (LVRT) techniques literature. However, only few works have really analyzed behavior semic...