Basler Electric DECS-250N - Manual (Page 46)

30 9440500990 Rev D
Regulation DECS-250N
ID number to share load with the currently connected DECS-250N. It is not necessary for the Load Share
ID to be unique for each unit. This allows for load sharing units to be grouped.
Load sharing settings consist of an Enable checkbox E and Droop F , Gain G , Washout Filter Time Constant H ,
Washout Filter Gain I and Load Share ID J settings.
Line Drop Compensation
When enabled K , line drop compensation can be used to maintain voltage at a load located at a distance
from the generator. The DECS-250N achieves this by measuring the line current and calculating the
voltage for a specific point on the line. Line drop compensation is applied to both the real and reactive
portion of the generator line current. It is expressed as a percentage of the generator terminal voltage
L .
Equation 2 is used to calculate the Line Drop Value.
𝐿𝐷
𝑉𝑎𝑙𝑢𝑒
= ��𝑉
𝑎𝑣𝑔
− �𝐿𝐷 × 𝐼
𝑎𝑣𝑔
× cos �𝐼
𝑏 𝑎𝑛𝑔
���
2
+ �𝐿𝐷 × 𝐼
𝑎𝑣𝑔
× sin �𝐼
𝑏 𝑎𝑛𝑔
��
2
Equation 2. Line Drop Value
LD
Value
= Line drop value (per unit)
V
avg
= Average voltage, metered value (per unit)
LD = Line Drop % / 100
I
avg
= Average Current, metered value (per unit)
I
bang
= Angle of phase B current (no compensation)
The LD
Value
is the per-unit value seen down the line from the synchronous machine. Equation 3 is used to
determine the voltage needed to adjust for line drop.
𝑉
𝑎𝑑𝑗𝑢𝑠𝑡,𝑃𝑈
= 𝑉
𝑟𝑚𝑠,𝑃𝑈
− 𝐿𝐷
𝑉𝑎𝑙𝑢𝑒
Equation 3. Voltage Needed to Adjust for Line Drop
Equation 4 is used to obtain primary units.
𝑉
𝑎𝑑𝑗𝑢𝑠𝑡
= 𝑉
𝑎𝑑𝑗𝑢𝑠𝑡,𝑃𝑈
× 𝑉
𝑟𝑎𝑡𝑒𝑑
Equation 4. Obtain Primary Units
The new line drop adjusted setpoint is calculated using Equation 5.
𝑉
𝐴𝑑𝑗𝑢𝑠𝑡𝑒𝑑 𝑆𝑒𝑡𝑝𝑜𝑖𝑛𝑡
= 𝑉
𝑆𝑒𝑡𝑝𝑜𝑖𝑛𝑡
+ 𝑉
𝑎𝑑𝑗𝑢𝑠𝑡
Equation 5. Line Drop Adjusted Setpoint
Refer to Figure 19 for an illustration of the Line drop compensation settings.