Majidreza Salehi

13 Questions 11 Answers 0 Followers

Questions related from Majidreza Salehi

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...

02 February 2017 5,027 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...

07 July 2016 5,181 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...

01 January 2016 8,829 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...

01 January 2016 1,842 9 View

How much unbalance is acceptable in grid connected wind converter?

voltage unbalance in grid is important in grid connected converter. How much is acceptable?

11 November 2014 1,067 3 View

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

I am currently working with Solidworks. Solidworks s good for modeling assembly parts but it isn't strong with mechanical analysis. I worked with ANSYS and Abaqus but both of them are difficult...

11 November 2014 1,718 5 View

What kind of motor is use in hybrid car?

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

10 October 2014 1,327 0 View

What kind of this is better PLL or FLL?

For grid connected solar inverter

10 October 2014 9,694 1 View

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

NTC is nonlinear.

10 October 2014 5,298 7 View

How can I detect islanding in a grid-connected converter?

The study and development of anti-islanding controls are very important in wind and solar applications.

10 October 2014 3,404 11 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?

10 October 2014 2,705 7 View

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

CHP =combined heat and power for more inefficiency.

10 October 2014 1,994 9 View

What is a suitable filter for a tyristor rectifier?

We have a battery smart charger and discharger that produces a very harmonic grid. We use the capacitor bank but after few time the capacitor fails. Can anybody help me with a design filter?

10 October 2014 4,645 3 View