Manual Energy Storage Inverter ESI-S
Commissioning instructions 149
•
The user restarts a network identification process by changing the ‘S’
indication into a ‘Y’ indication in the harmonic selection table
•
The inverter automatically restarts an identification process on all
harmonics that were put in standby previously when a successful
identification of another harmonic is made. As a result, the harmonic
considered will be automatically filtering when the network conditions
allow for this.
−
If plain capacitors (i.e. capacitor banks not incorporating detuning reactors) are
present in the network it is recommended to switch them off or change them into
detuned banks. Sometimes, the commissioning engineer is faced with an
installation where both an active inverter and plain capacitors are present
however. While this is an ill-advised and a technically unsound situation, ABB
acknowledges that in this case also the system should aim to give an optimal
performance. For this reason the control software of the inverter incorporates a
Stability Detection Program (SDP) that aims to increase the inverter performance
in this type of applications.
In installations where plain capacitors are present and cannot be switched off or
changed to detuned capacitor banks, adhere to the recommendations below for
optimal results.
•
Install the capacitor banks upstream of the inverter CT measurement
location
•
Set the inverter in Mode 3
−
In installations where detuned banks are present, it is recommended not to select
harmonic orders below the tuning frequency of the detuned banks.
indicates the harmonics recommended to be deselected for different types of
detuned banks.
Table 52: Recommended harmonics to be deselected for different detuned bank types
Detuned bank type Harmonics recommended to be deselected
5.67 %
2, 3, 4
6 %
2, 3, 4
7 %
2, 3
14 %
2
For other types of detuned bank please contact your ABB Service provider to evaluate
the resonance frequency and the harmonics that are recommended to be deselected.
When background distortion is present on the network and detuned capacitor banks are
installed adjacent to the active inverter or inverter but connected downstream of the
inverter CTs, inverter resources will be lost. To overcome this, it is recommended to
either connect the detuned capacitor bank upstream of the inverter CTs or to use the CT
connection approach shown in
