In this paper the effect of presence of wind farms on relay coordination at fault condition and transient response at reclosing condition is studied. Wind farms as one of the important distribution generations (DGs) are so effective on overcurrent relay coordination in power systems. As well as Wind farms cause to severe oscillations on voltage, power and frequency in power system after reclosi...

This paper presents an improved control strategy for both the rotor side converter (RSC) and grid side converter (GSC) of a doubly fed induction generator (DFIG)-based wind turbine (WT) system to enhance the low voltage ride through (LVRT) capability. Within the proposed control strategy, the RSC control introduces transient feed-forward compensation terms to mitigate the high frequency harmoni...

Abstract: Distributed renewable energy systems play an increasing role in today’s energy paradigm. Thus, intensive research activities have been centered on improving the performance of renewable energy systems, including photovoltaic (PV) systems, which should be of multiple-functionality. That is, the PV systems should be more intelligent in the consideration of grid stability, reliability, a...

In this paper we proposed an advanced Multi-level converters with ride through capability for unified power-flow controller (UPFC) applications, because of high power ratings Among all multilevel topologies, the three-level neutral-pointclamped (NPC) converter allows back-to-back connection as the UPFC shunt and series converters gives us better results. Besides the pulse widthmodulated (PWM) m...

In Isolated power systems the power quality problem is compounded as the drive converter loads are likely to fluctuate in conjunction with mining or exploration areas. The use of compensators in improving power quality of isolated power systems is considered. The roles of the compensators are to mitigate the effects of momentary voltage sags/swells, and to control the level of harmonic distorti...

The increasing penetration of non-synchronous, renewable energy in modern power systems displaces synchronous generation and affects transient stability. This is just one of the factors that has led to preventive curtailment of renewable energy sources in an increasing number of electrical grids. Transient stability constrained optimal power flow (OPF) techniques provide a tool to optimize the ...

This paper presents a comprehensive review of various techniques employed to enhance the low voltage ride through (LVRT) capability of the fixed-speed induction generators (FSIGs)-based wind turbines (WTs), which has a non-negligible 20% contribution of the existing wind energy in the world. As the FSIG-based WT system is directly connected to the grid with no power electronic interfaces, termi...

Due to a limitation in the magnitude of three-phase output inverter currents, active power photovoltaic (PV) unit has been de-rated during low voltage ride through, which brings great instability risk system. With increase penetration rate new energy, impact shortage on system transient stability increases. It is significance analyze this stability. This article explores methods improve capabil...

With an increasing capacity of inverter-based generation and with a 100% renewable energy power system on the horizon, grid forming converters have potential to become prevalent control mode in grid. Thus, correct performance these devices is going be crucial for stability security supply. Most research related grid-forming focused normal operating conditions, although significant effort has be...

in this paper, plug-in fuel cell electric vehicle (pfcev) is considered with dual power sources including fuel cell (fc) and battery energy storage. in order to respond to a transient power demand, usually supercapacitor energy storage device is combined with fuel cell to create a hybrid system with high energy density of fuel cell and the high power density of battery. in order to simulate the...