Due to the growing power demands in microgrids (MGs), necessity for parallel production achieved from distributed generations (DGs) supply load required by customers has been increased. Since DGs have procure demand mode, they are faced with several technical and economic challenges, such as preventing overloading not losing network stability considering feeder impedance variation. This paper p...

Nitride-based light-emitting diodes (LEDs) suffer from a reduction (droop) of the internal quantum efficiency with increasing injection current. This droop phenomenon is currently the subject of intense research worldwide, as it delays general lighting applications of GaN-based LEDs. Several explanations of the efficiency droop have been proposed in recent years, but none is widely accepted. Th...

The effect of strongly-imbalanced carrier concentration and mobility on efficiency droop is studied by comparing the onset voltage of high injection, the onset current density of the droop, and the magnitude of the droop, as well as their temperature dependence, of GaInN-based blue and green light-emitting diodes (LEDs). An n-to-p asymmetry factor is defined as σn/σp, and was found to be 17.1 f...

This paper addresses voltage control and load sharing in DC distribution systems. At present, DC distribution systems are utilised in, for example, telecommunication systems. Future applications could also involve distributed power systems based on renewable energy sources. The dynamic and stationary properties of voltage droop control and its load sharing abilities are investigated. The DC bus...

The cascaded droop-voltage-current controller plays a key role in the effective operation of microgrids, where performance is critically impacted by desigheme, constant value n droop controller. Moreover, critical loading (e.g.: connection/disconnection large inductive load), pre-set coefficient brings asymmetry transient leading to instability. Hence, improve symmetry reducing trade-off betwee...

In this paper, an attempt has been made to introduce a new control strategy including Plug-in Hybrid Electric Vehicle (PHEV) and Diesel engine generator to control the voltage and frequency of autonomous microgrids. The proposed control strategy has multiple advantages over the recent control methods in microgrids. The proposed method applies the primary and secondary frequency control strategy...

Nitride-based light-emitting diodes (LEDs) suffer from a reduction (droop) of the internal quantum efficiency with increasing injection current. This droop phenomenon is currently the subject of intense research worldwide, as it delays general lighting applications of GaN-based LEDs. Several proposals have been forwarded to explain the efficiency droop. Among the suggested droop mechanisms are ...

Abstract This paper presents the power flow modelling for AC/DC hybrid islanded microgrids including droop-controlled distributed generation units, secondary frequency and voltage restoration control AC side of microgrid, DC microgrid. The interlink converter between includes a frequency-voltage droop control, considers effect microgrid side. Two case studies are presented model evaluation, in ...