We often use a back to back converter topology for modelling a renewable energy system, so the placement of a DC link capacitor after the rectifier side is very essential. I want to know, how to select the suitable value of this DC link capacitor?
You can actually have a very simple simulation with only one voltage source and diode
L/C with r / and resistive load set up to see the effects of parameter variation in a matter of few minutes before detailed simulation ..Cheers
If you are looking for a basis for dimensioning of the link capacitor you may like to consider the following for say a bridge rectifier/ inverter configuration here is
a possible solution .
1 Ensure enough series inductance to retain continuous current mode
2 A small series resistance if needed to control switching transient
3 estimate the most significant rectifier output harmonic voltage
4. Tune Lc to minimize current ripple
5 PSPICE is an excellent software where you can actually
simulate a simple system rect/link/load and obtain required design values
by trial and error without drowning in various formulas. It has the
advantage also of displaying transients!! which one may not always foresee..
good luck
You can actually have a very simple simulation with only one voltage source and diode
L/C with r / and resistive load set up to see the effects of parameter variation in a matter of few minutes before detailed simulation ..Cheers
An important point that hasn´t being mentioned is that the capacitor should be rated to drain the rms current in the application, if you are using a simulation is a simple task to calculate it. The square rms current times the equivalent series esr of the capacitor gives you the power losses. The maximum rms current should be in the capacitors datasheet.
A good point . capacitors are known to burst due to ( Irms )^2 *Rseries(of capacitor)
and is one of the design selection parameters.
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