User Manual

Applications
ApplicationsApplications
Keyword
KeywordKeyword
Also
refer
to
the
features
of
other
applications
.
*Als
ore
fer
to t
he f
eatu
res
of other
app
lication
s
Power Generation and Conversion Efficiency
Measurements in New Energy Markets, including
Photovoltaic and Wind Power Generation
Power Generation and Conversion Efficiency
Measurements in New Energy Markets, including
Photovoltaic and Wind Power Generation
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P
yr
a
a
an
ano
meter (photovoltaic power g
e
e
neration
)
V
Van
e anemometer
(
w
i
n
d
power
g
enerat
i
on
)
n Max. 1000 V/50 A × 6-line direct measurement
Direct input terminals in a voltage range from 1.5 V to 1000 V and
current range from 10 mA to 5 A or 1 A to 50 A make it possible
to perform high-precision measurements without using a current
sensor.
Furthermore, power conditioner evaluation requires
multiple-channel power measurements, such as inputs/outputs
from a boost converter, inverter, and storage battery. The WT1800
is capable of providing up to 6 channels of power inputs to make
it possible to simultaneously perform power measurements at
multiple points with one unit. In addition, two units can be
operated in synchronization for multi-channel power evaluation.
A power integration function makes it possible to measure the
amount of power sold/bought in grid interconnection and of
battery charge/discharge. The WT1800 provides a current
integration (q), apparent power integration (WS), reactive power
integration (WQ), as well as effective power integration capable of
integration in the power sold/bought and charge/discharge
modes.
Furthermore, a user-defined function makes it possible to
calculate the Average active power within the integration period.
This makes it possible to more accurately measure the power
consumption of an intermittent oscillation control unit in which
power fluctuates greatly.
An event trigger function is helpful in verifying that voltage or
current changes are within the design tolerance range. Setting
the normal power generation range as a judgment condition
(trigger) detects measurement data that falls out of that range
and save it to the memory.
In photovoltaic power generation, an MPPT control is performed
to effectively utilize voltage generated by photovoltaic cells in an
attempt to maximize the harvested power.
The WT1800 is capable of measuring not only the voltage,
current, and power but also the voltage, current, and power peak
values (plus (+) and minus (-) sides, respectively). Also, the
maximum power peak value (plus (+) and minus (-) sides) can be
measured.
n Maximum Power Peak Tracking (MPPT) measurement
n Power integration
(power sold and bought/charge and discharge)
measurements
n Trigger when an error occurs
(User-defined event function)
Typical measurement of power value (P1),
plus (+) side (P+pk) and minus (-) side (P-pk) of max. power peak value
i
ndicates measurement
p
oints and in
p
ut
t
o t
h
e power ana
l
yzer.
(A)
i
n
di
cates
connect
i
n
g
t
h
e sensor s
ig
na
l
s to t
h
e
a
uxiliary input (/AUX) of the power analyzer
.
A
1
2 3
4
6
5
Power cond
i
t
i
one
r
B
oost
converte
er
A
C/
D
C
converte
er
C
urrent
c
h
arge
contro
l
P
ower stora
g
e syste
m
Charge/discharge
Power
sold/bought
P
ower Flow o
f
Photovoltaic Power
G
eneration
Reverse power flow
L
oa
d
Grid interconnection or smart grid
(next-generation power network)
ry
batter
Storage
c.
HV, etc
Plug-in
Typical voltage, current, and power measurements in MPPT contro
* This is just an illustration.
Actual measurements are
affected by noise.
Voltage value
Max. power value
T pical meas rement of po er al e (P1)
PP
P
MM
MM
M
PP
P
Overview
E
nergy generated by photovoltaic cell modules and wind turbines is converted from DC to AC by a power conditioner. Furthermore, the voltage is converted by a charge control unit
for the stora
g
e battery. Minimizin
g
losses in these conversions improves efficiency in the overall ener
g
y system. The WT1800 is capable of providin
g
up to 6 channels of power inputs
per unit to make it possible to measure the volta
g
e, current, power, and frequency
(
for AC
)
before and after each converter, as well as converter efficiency and char
g
in
g
efficiency.
Advantages of WT1800
Current
value
power
value
Wide voltage/
current range
Wide voltage/
current range
Efficiency
measurement
Efficiency
measurement
Synchronized
operation
Synchronized
operation
Power
sold/bought
Power
sold/bought
Charge/
discharge
Charge/
discharge
Average active
power
Average active
power
Maximum power
peak value
Maximum power
peak value
MPPTMPPT
Data saving
when an
error occurs
Data saving
when an
error occurs
8