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Forum: FPGA, VHDL & Verilog FPGA for SHUNT ACTIVE POWER FILTER


Author: Rohan D. (rohan_d29)
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hi.. i am doing a masters project on FPGA for SHUNT ACTIVE POWER FILTER, 
i am confused whoch type of fpga should be used.. because in my project, 
2 currents i.e., reference and compensation currents needs to be 
compared and a pulse has to be generated using a relay, so which fpga 
has this kind of adaptability..plz plzz suggest me as sson as possible
thanks in advance

Author: Lothar Miller (lkmiller) (Moderator)
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Do you know what a FPGA is? And if so: what part of the job has it to 
do? What's the job at all? Just switching a relay? What kind of relay? 
I'm pretty sure its not the kind of relay to be found in a catalog. And 
one step back: How do you measure the current?

: Edited by Moderator
Author: Rohan D. (rohan_d29)
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FPGA for the purpose of generating the pulses for a three phase 
inverter.. so by comparing the currents i need to get a compensating 
current..my que is does any of the fpga's spartan6, spartan3an has the 
option of comparing the curents..i am not sure about it..need ur 
suggestion
  and the measuring of curent..i am gonna give curent sensors for both 
source and load sides.. the problem comes when comparing the currents 
and giving a pulse as output.. does any of the above mentioned FPGA's 
has dat function??

Author: Lothar Miller (lkmiller) (Moderator)
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Rohan D. wrote:
> my que is does any of the fpga's spartan6, spartan3an has the option of
> comparing the curents..i am not sure about it..
FPGAs can compare binary numbers/vectors. But a current is an analog 
value. So you must add an ADC, read it out and then you have a binary 
value for a calculation...

But for me the task is much more than "comparing two values and generate 
a pulse". This would be a stupidly simple task for a masters project. I 
would do that in less than 10 minutes. So, there MUST be more!

And yes, any of the mentioned FPGA can do that comparison without 
getting busy in any way.

: Edited by Moderator
Author: Rohan D. (rohan_d29)
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thanks for the info..may b its a stupid task for you..appreciate your 
concern..bt my final aim is to reduce the THD of source currents from 
say 33% to a say 5-10% which isnt tough..but in our region FPGA is very 
unlikely thing..still we are knowing abt it..so any suggestions would be 
valuable :)

Author: Lothar Miller (lkmiller) (Moderator)
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Rohan D. wrote:
> so any suggestions would be valuable :)
FPGA is hardware so you must draw a schematic how you transfer the 
analog values to digital world. And then you draw binary comparators, 
counters and other logic to get the job done.
After having such an overview schematic you can transfer it into Verilog 
or VHDL.

But to get this job done whithout any basic knowledge about HDL and 
FPGA you will need a very experienced mentor. You will not be able to do 
it on your own...

> bt my final aim is to reduce the THD of source currents
Do you have a working sample of such a device for measurements? Is there 
knowledge about such devices?

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