Atec Elgar-ETS Series - Manual (Page 2)

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Product Overview
The ETS series standalone TerraSAS consists
of a high performance, programmable DC
power supply with control software and GUI
interface, output isolation, and a unique PV
simulation engine that provides the I-V curve.
This combination of hardware, software, and
firmware allows the TerraSAS to simulate test
protocols or combinations of events that a real-
world solar installation will be subjected to.
The included software allows modeling of a PV
panel without an extensive knowledge of solar
array parameters. The only parameters required
for a simulation are the open circuit voltage (Voc),
short circuit current (Isc), and the peak power
parameters Vmp and Imp. Changes to these
parameters allow the shape of the I-V curve to be
adapted to any fill factor between 0.5 and 0.95.
Once an I-V curve has been generated, changes
to the irradiation level or temperature can be
modified on the fly to test the behavior of a
grid tied inverter under realistic conditions for
cloud shadowing and panel temperature rise.
Long term weather simulations can be loaded
and run to determine the amount of energy
harvest delivered in a given situation. Inverter
designers use these accuracy and efficiency tests
to optimize real MPP search modes.
Scalability
Power supplies are available in 850W, 5kW,
10kW, and 15KW increments. The 80V units
are available in two power levels: 1200W
for microinverters and 850W for the latest
generation microinverters and DC power
optimizers. The bandwidth on the 850W version
has been improved to 30kHz by adding a linear
regulation output stage. 600V units are available
in 5kW, 10kW, and 15kW versions depending on
Isc requirements. 1000V units are rated 10kW.
All versions are easily connected in parallel to
scale output power up to handle microinverters,
string inverters, and even utility scale inverters.
Many models can also be connected in series to
handle higher voltage tests. Please refer to the
connection diagrams located in the User Manual
and follow appropriate wiring codes before
connecting ETS PV simulators in series or parallel.
Real time I-V curve display
The Elgar Real time I-V curve display is updated
20 times per second to illustrate dynamic inverter
behavior (operating point and sweep amplitude).
Compared to other commercially available solar
array simulators with an update rate of only 1Hz,
this allows more accurate analysis of the inverter’s
actual MPP tracking ability.
ETS TerraSAS
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