Why 3-Phase to Positive Sequence (Magnitude & Phase) Transformation is done in Line Current Measurement for Line-Ground (LG,LLG etc) Fault Analysis?

I came across a simulation in which 3-phase wave forms (a,b & c) for line current (a TL connecting two buses in an electric grid) performs the 3-ph to positive sequence transformation to...

08 September 2019 3,110 1 View

Acceptable Fault Current Magnitudes for High Voltage Transmission Systems?

After simulating the IEEE-39 Bus System Benchmark in EMTP-RV software, I introduced faults in the 500 kV transmission system at its various bus locations (one at a time). I am observing very high...

03 April 2019 7,636 4 View

Which IEEE standard specifies the allowable ripple voltage for single phase systems?

Good day,Can you please kindly specify/state the IEEE standard which specifies the allowable ripple voltage for the single phase grid connected power electronic systems. In the literature I have...

04 May 2017 3,319 6 View

What are the possible methodologies/algorithms/ways for reducing DC Link capacitor size in Bidirectional Full Bridge AC/DC power Converters?

I am searching for possible ways/techniques/control algorithms which can be utilized to reduce the DC link capacitor sizing in a bidirectional full bridge AC/DC converter. Can you kindly suggest...

01 February 2017 9,979 4 View

How can I obtain the State space A,B,C & D matrices for a Linearized Wind Turbine model at different operating points (different wind speeds) ?

Can you kindly help me identify how can I get the state space matrix representation for a linearized wind turbine model resulting into A,B,C and D matrices for different operating points (i,e...

03 April 2016 1,229 6 View

How can I find clear sky days in a year using meteorological measurements, primarily using GHI (Global Horizontal Irradiance) measurements?

11 December 2015 9,816 25 View

How can I find clear sky days using GHI (Global Horizontal Irradiance)?

11 December 2015 8,573 11 View

How do I determine which Base Temperature value to choose in a particular region when calculating Degree Days?

I am trying to find out the degree days , heating degree days and the cooling degree days for Abu Dhabi. My question is how do I determine which base temperature value to choose for my...

10 November 2015 8,285 5 View

How do I find the coefficients a,b,c in Donatelli & Campbell (1998) Solar Radiation Model can they be equal to the Bristow & Campbell coefficients?

09 October 2015 8,586 2 View

No title

09 October 2015 1,457 2 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

I need to image mesoporous silica nanoparticles that are in ~100 nm size and do high resolution TEM to look at mesopores. what grids should I use?

Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru

02 March 2021 1,787 2 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

SDS page software for analysis?

I did sds page to determine the difference in protein expression between 3 types of vaccine , but i don't have scanner or densitometer available. . so i wonder if there is a software to analyze...

02 March 2021 6,270 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Why the results when using wall thickness and when using shell conduction are different in ansys fluent?

Actually, I am running cfd simulation for a heat exchanger which has two fluids one hot and other one is cold fluid. there is a solid domain between them, which I removed and instead I have used...

01 March 2021 9,537 2 View

Joint behaviour in Abaqus is not captured well?

I am working on roof joint and trying to simulate the behaviour in Abaqus. I am successful in running the model but the final graph does not follow the experimental curve in the negative direction...

01 March 2021 6,661 3 View