136
Installation Manual
For parameter, which used in grid support and protection function, adjustable
requirement of CA Rule 21, HECO 14H and IEEE1547, the relevant explanations
and setting methods can obtain by reading, <Parameter Adjustable Method
of Grid Support Utility Interactive Inverter>, the document can be obtained by
contacting the after-sales.
a
Measurement accuracy requirements specified in this table are applicable for
voltage THD < 2.5% and individual voltage harmonics < 1.5%.
b
Accuracy requirements for frequency are applicable only when the fundamental
voltage is greater than 30% of the nominal voltage.
Time frame Steady-state Measurements
Transient Measurements
Parameter
Minimum
measurement
accuracy
Measurement
window
Range
Minimum
measurement
accuracy
Measurement
window
Range
Voltage,
RMS
(+ 1% V
nom
)
10 cycles
0.5 p.u.
to 1.2
p.u.
(+ 2% V
nom
)
5 cycles
0.5
p.u.
to 1.2
p.u.
Frequency
b
10 mHz
60 cycles
50 Hz
to 66
Hz
100 mHz
5 cycles
50 Hz
to 66
Hz
Active
Power
(+ 5% S
rated
)
10 cycles
0.2 p.u.
< P <
1.0 p.u.
Not
required
N/A
N/A
Reactive
Power
(+ 5% S
rated
)
10 cycles
0.2 p.u.
< Q <
1.0 p.u.
Not
required
N/A
N/A
Time
1% of
measured
duration
N/A
5s to
600s
2 cycles
N/A
100
ms <
5 s
Appendix / Grid Parameter Settings
5.7. GRID PARAMETER SETTINGS
