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

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

What is the reason of DC harmonics in grid-connected converters?

We designed a grid-connected converter for wind. We saw in the grid side there is a DC current. Can anybody solve this problem?

09 October 2014 2,616 7 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 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

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 have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View