Hello, my name is Kevin Cavell and I'm a Solutions Manager working for the Automotive and Energy
Solutions team at Keysight Technologies.
Today I have an EV1003A Power Converter Test Solution in front of me.
But I want to focus in on one piece of this solution which is the RP7900 Series Regenerative
Power System.
What we're going to do is we're going to use the power analyzer to measure how cleanly
we regenerate power back to the grid.
So the top regenerative power system will be sourcing power into the bottom regenerative
power system, and that one will be taking that power and regenerating it back to the grid.
And again, we're going to use the power analyzer to measure the total harmonic distortion of
that regeneration to show you how clean that is.
Now today we've hooked this system up to a very clean AC source in order to provide the
three-phase AC input because regular grids can have some voltage noise on them that would
affect the measurement in this system.
So you need to do this in a laboratory environment to show how clean the RP7900 regenerates back
to the grid.
Alright so I've set the system up - we're going to do this measurement at three different
power levels.
The first is one kilowatt so 250V 4A - we'll turn the power supply on and we'll go back
up to the power analyzer, we'll hit the Analyze button.
You can see the total harmonic distortion on the one of the phases of voltage is extremely
low at 0.05%.
You can also see some of the harmonics.
But what we're concerned with is not necessarily the voltage because that's controlled by the
grid, but the current that we're regenerating back to the grid, so let's go look at the
first phase current.
So you can see that the total harmonic distortion of the lower regenerative power system when
it's regenerating 250V 4A DC back to the three-phase AC grid is about 3.5% - again, you can see
the harmonics here.
Now if we take a look at another phase the current of phase 2, you can see the measurement
is roughly the same 3.3%.
OK, so that was 1,000W.
Let's go up to 5,000W by changing that to 20A.
So now we're sinking 250V 20A DC back to the grid and you can see that actually at higher
powers the cleanliness is better.
The total harmonic distortion goes down from 3.5% to 1.2% and again we can look at the
current of phase one.
It's actually even better - about 1% total harmonic distortion.
Let's look at phase 3 - 1.2% - again this is at 5,000W.
Now these are 10kW power supplies so if we go all the way up to 10kW or 40A you can hear
the fan noise picking up to cool it.
Well you can see the THD actually gets even better it's sub 1% about 0.8% and again we
can look into one of the other phases - 0.6% again roughly the same and then the last phase, 0.8%.
So you can see - let me shut this off.
You can see that the RP7900 Series is extremely clean when it's regenerating power back to the grid.
It's really important so that you don't affect any of the other equipment that is plugged
into that particular grid.
So when regenerating back to the AC line you want to make sure you're clean and I think
we proved today that the RP7900 is very much so.
So we hope you learnt something today and thank you for watching.