See Also
Switched Shunt SVC Control Mode simulates a continuous or discrete shunt element that can control up to 8 fixed shunts. These shunts do not have to have a Control Mode that is fixed, but they are treated as fixed as long as they are being controlled by an SVC. To operate in this mode, the SVC Control Mode has to be selected in the Parameter tab of the Shunt Information dialog in either Edit mode or Run mode.
The following tabs are available for specifying SVC shunt parameters and options:
SVC Control Options
SVC Type
Chose between None, SVSMO1, SVSMO2 and SVSMO3.
SVSMO1: For thus type the limits consider the Susceptane (B) of the shunt.
SVSMO2: For thus type the limits consider the susceptane (B) of the shunt and the continuous element is replaced by discrete shunts.
SVSMO3:.For thus type the limits consider the Reactive Current of the shunt.
Minimum Continuous Nom Mvar or Minimum Continuous Curr.(pu) in svsmo3
Minimum value of B continuous element in Mvar. (Not used in SVSMO3).
Maximum Continuous Nom Mvar or Maximum Continuous Curr.(pu) in svsmo3
Maximum value of B continuous element in Mvar or Reactive Current in p.u. for SVSMO3 type.
Minimum Switching Nom Mvar (Bminsh) pu or Minimum Switching Curr.(pu) in svsmo3
Minimum value fo B in Mvar or Reactive Current in p.u. for SVSMO3 type to perform shunt switching.
Maximum Switching Nom Mvar (Bmaxsh) pu or Maximum Switching Curr.(pu) in svsmo3
Maximum value fo B in Mvar or Reactive Current in p.u. for SVSMO3 type to perform shunt switching or Reactive Current in p.u. for SVSMO3 type.
Note: Here is the link for the algorithm used in PowerWorld about Switching Fixed controllable shunts.
Comp. reactance (Xc) pu
Compensating Reactance for voltage control in p.u. When using the compensating reactance (Xc <> 0) the shunt will not regulate the Regulated Bus but instead will regulate its own terminal plus the linear slope, using the parameter Xc. For example, if a 3% voltage change is allowed across the entire control range of an SVC, and the SVC is rated +200/-100 Mvar and we assume a system MVA base of 100 MVA, then the slope is Xc = 0.03/3 = 0.01 pu on 100 MVA base. In steady-state (as along as it has not run out of capacitive/inductive range) the SVC will act until Vcomp is equal to Vsched. Vcomp = Vbus + (Vbus)*(Bsvc)*(Xc), where Vbus is the actual bus voltage. What the results will show for the voltage is the Vcomp value. The SVC output (Bsvc) is limited to stay within Bmax/Bmin. When the case solves the actual bus voltage will be Vbus = Vsched – (Vbus)*(Bsvc)*(Xc).
Slow control status (stsb)
Slow Control Status.
Slow Bmin (Bminsb) pu
Slow control minimum B in p.u. (Not used in SVSMO3).
Slow Bmax (Bmaxsb) pu
Slow control maximum B in p.u. (Not used in SVSMO3).
Slow Bmin voltage (Vrefmin) pu
Slow control minimum voltage in p.u.
Slow Bmax voltage (Vrefmax) pu
Slow control maximum voltage in p.u..
Change in V/change in B (dvdb)
Slow control p.u. Change in V by p.u. change in B. if the shunt is SVSMO3 then it is the Slow control p.u. Change in V by p.u. change in I (Reactive Current).
Add Fixed Shunts
By clicking on this button, a dialog will open to select any shunts to be controlled by the SVC Shunt. Shunts with any control mode except for SVC can be controlled by an SVC. These shunts will be treated as fixed as long as the SVC controlling them is on active control. If the SVC is not on control, they will operate based on their own control mode. These Fixed Shunts are also used with the transient stability models of the SVCs.
SVC Fixed Shunt Options
On this tab there is information about the SVC Shunt that is controlling this particular shunt. Shunts with any Control Mode except SVC can be controlled by an SVC and will be treated as fixed while being controlled by an SVC. Options will be disabled if the control mode of the current shunt is not applicable for being controlled by an SVC.
Select SVC Shunt
This button will open a dialog that allows selection of the SVC that should control this shunt.
SVC Shunt Object ID
Object ID of the SVC controlling the shunt. The Object ID will be based on the Key Fields, that could be the Primary, Secondary or Label.
Available for SVC Control
Checking this box means that the shunt can be controlled by the specified SVC.
Some important SVC Control Considerations when running Transient Stability.