ABB PQFS Installation, Operation And Maintenance Instructions page 85

Highest priority level
Mode 1 Filtering to curve
Mode 2 Filtering to curve
Mode 3 Filtering to curve
In Mode 1, the filter will first filter to the pre-programmed curve. Once the
requirements are fulfilled, the remaining resources will be allocated to reducing
the selected harmonics as close as possible to zero. If further resources are then
available, reactive power compensation and load balancing will be performed as
required.
In Mode 2, the second priority after filtering to the curve is reactive power
compensation and load balancing. Maximum filtering comes in third place and
will be done if both the curve specification and the reactive power requirements
including balancing are fulfilled.
In Mode 3, the filter will first ensure that the harmonic curve specification is
fulfilled. If then there are still resources available, the filter will do reactive power
compensation and load balancing if requested by the user.
Figure 72 illustrates the principle of filtering to curve for one particular harmonic
order. The flexibility of the PQF control is such that a specific curve level may be
defined for each selected harmonic.
Figure 72: Filtering to curve for harmonic order n
The default filter mode is Mode 3.
· Selecting the harmonics with setting of curve levels
For setting
[/Welcome/Settings/Customer set./Main settings/Main harmonics]
For setting up
[/Welcome/Settings/Customer set./Auxiliary settings/Aux. harmonics]
The harmonics that can be selected are presented in a table such as presented
in Table 37.
When the PQFS is operating in 4-W mode, 15 harmonics can be selected.
When the PQFS is operating in 3-W mode, 20 harmonics can be selected.
Table 36: Available filter modes
Maximum filtering
Reactive compensation
Reactive compensation
up the filter's main
the filter's auxiliary
Manual Power Quality Filter PQFS ç The PQF-Manager user interface 85
Lowest priority level
Reactive compensation
Maximum filtering
-
harmonics selection
harmonics selection
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