Do you have any idea about ground connection in transformerless on-grid solar inverters?

Is it true that null wire of grid and inverter case and solar panel frame are all connected to same ground? Can this connection result in a short circuit? Is there any requirements for this...

01 February 2017 4,941 1 View

How can I simulate a delta-zig zag transformer in Matlab?

As there is no model for such a transformer in Matlab, I need the exact equations of primary and secondary voltage and currents of this transformer and also the wiring connections so that I can...

06 July 2016 5,007 5 View

What special consideration should we give to choose a transformer for an inverter?

which kind of core material, wiring (delat-wye, delta-zigzag, ...) is appropriate for a 3-phase inveter according to the harmonic problems, acoustic noise, neutral overload supplying nonlinear...

31 December 2015 8,738 9 View

Which voltage quantity must be monitored Investigating output characteristics of UPS systems based on IEC62040-3?

My understanding of IEC62040-3 is that for linear loads, RMS output voltage of UPS systems must be checked according to the specified criteria and for nonlinear loads, voltage of rectifier load...

31 December 2015 1,750 9 View

What software is useful for mechanical analysis of displacement and bending in sheet metal enclosure?

10 November 2014 1,621 5 View

How much unbalance is acceptable in grid connected wind converter?

10 November 2014 965 3 View

Can anyone suggest a method for linear NTC for temperature measurement?

09 October 2014 5,200 7 View

What kind of motor is use in hybrid car?

I think BLDC motor is used in hybrid car . Is this correct?

09 October 2014 1,238 0 View

What kind of renewable energy is better in Iran: solar, wind or CHP ?

09 October 2014 1,895 9 View

What kind of this is better PLL or FLL?

09 October 2014 9,574 1 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

How to size battery banks?

I am designing a small grid connected solar PV power-plant. As the battery's capacity is specified in Ah and demand in kWh. What is the best way to size the battery bank? I have battery price in...

28 February 2021 1,638 3 View

How to model the battery pack in PSIM or PSCAD?

Hello, I have simulated a single battery cell using Thevenin equivalent circuit. For a battery pack, I have a large number of cells connected in series and parallel connections. Is there any way...

28 February 2021 2,116 1 View

High aspect ratio hexahedral mesh optimization solver?

I am interested in evaluating mesh optimization solvers that converge to high aspect ratio unstructured hexahedral grids. In other words, I am interested in a solver that optimizes warpage,...

26 February 2021 7,279 2 View

How to calculate battery consumption for IoT device?

Hi, everyone I'm working on a privacy-preserving algorithm that will apply to IoT devices. So, I need to measure the power consumption by implementing this algorithm. Any suggestion, advice,...

25 February 2021 8,749 6 View

How to delaminate copper in water-based anodes?

Hello everyone, I'm looking for a way to delaminate copper current collector of water-based anodes in Li-ion batteries without damaging the graphite film. I tried different materials such as HNO3...

24 February 2021 3,785 3 View

How to clean up TEM grid with plasma cleaner?

I need to clean the hydrocarbon contamination on the carbon substrate of TEM grid. However, I heard that substrate could be broken by the powerful plasma. My substrate is pure carbon, with ~3nm,...

23 February 2021 3,262 5 View

Best excel chart to compare algorithms' running time?

Hi I want to compare the running time of robotic path planning algorithms. The grid size is 8X8. I have 100 scenarios of start and goal positions.. Each scenario is run in three obstacles ratio...

22 February 2021 621 1 View

What is the difference between AC conductivity and DC conductivity? Is AC conductivity = ionic and DC conductivity = electronic?

I am reading papers on batteries and although mostly people have reported ionic conductivity in Scm-1 but some have reported DC conductivity as well I and am confused as to what that is. Any help...

21 February 2021 9,207 6 View

Where can the fault diagnosis data set of lithium battery be found?

Most of the data sets on the network only contain good information about the voltage and internal resistance of lithium batteries. The data of faulty battery is missing. Who can help me, I will be...

21 February 2021 8,659 1 View