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The world is moving towards utilization of renewable energy generation systems from last few years. The implementation of micro-grids enables utilization of renewable sources and also helps in maintaining cleanliness of environment. Microgrid is nothing but grid consisting of energy generation sources and local load which can be operated in parallel with utility grids or can be operated in islanded...
This paper analyses the performance of a Q-f droop based anti-islanding protection (AIP) scheme when the islanded circuit contains both inverter based DG and directly connected synchronous generator (SG) based DG. It is found that the performance of the AIP method is significantly degraded when SG is present in the island. This is because frequency cannot be directly manipulated by injecting reactive...
Permanent magnet synchronous generators feeding into an intermediate d.c. circuit via a diode rectifier operate at relatively low active factor. Compensators such as STATCOM and SSSC are proposed to improve generator output voltage and power. In view of wind energy system application their performance is also investigated in variable speed operation. Simulation results of an example are shown.
Validated electrical performance models of power system components are required to support a range of power system planning studies, interconnection studies and plant design. This includes steady-state (power flow) models, detailed transient models for the study of electromagnetic interactions, dynamic models for the study of electromechanical phenomena, and short circuit models. Transmission and...
This paper designs a rectifier load simulative generator, which can produce harmonic current, active current and reactive current to test the performance of power quality amelioration equipments conveniently and economically. The characteristics of rectifier circuit with a large inductance loading or with capacitive load are analyzed. The circuit structure and control strategy of the simulative generator...
As PV - distributed generation (DG-PV) penetration increases, its reaction with various system disturbances (i.e. voltage drop, short circuit, frequency deviation) has to be taken into account during relative system studies. Though for wind farm generation (WFG) a lot of effort has been made for the development of appropriate models, there is still a lot of progress to be done in the field of PV Generation...
This paper studies the impact of intra-die random variability on low-power digital circuit designs, specifically, circuit timing failures due to intra-die variability. We identify a new low-Vdd statistical failure mode that is strongly supply-voltage dependent and also introduce a simple yet novel method for quantifying the effects of process variability on digital timing - a delay overlapping stage...
This paper describes a design flow for the circuit-level optimization of a technology. The concurrent exploration of device characteristics and library design choices leads to a more application-optimal technology. We illustrate the design flow by: 1) analyzing the impact of buffer cell design, and 2) by optimizing a 130 nm technology for low operational power.
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