Participation Point Records Display
The Participation Point Records Display shows information about the points that comprise a particular injection group. This display can be accessed for a particular injection group from the Injection Group dialog or the Injection Group Display.
The Participation Point Records Display is a class of Case Information Display and therefore can be used in a manner consistent with all other case information displays. It has a local menu from which participation points can be deleted or added to the injection group through the Add Participation Points dialog. Selecting Insert from the local menu will open the Add Participation Points dialog that will allow the addition, deletion, and modification of participation points in the injection group.
The Participation Point Records Display shows the following fields by default:
Point Type
Every participation point is a generator (GEN), load (LOAD), switched shunt (SHUNT), bus (BUS), or injection group (INJECTIONGROUP).
Bus participation points will be ignored in tools that actually make system changes. These include Scaling, PV, ATC, Time Step Simulation, Island-Based AGC, and Injection Group Area Slack. Bus participation points will be allowed in linear sensitivity calculations and ATC calculations using only the Single Linear Step method.
Number
Identifies the number of the bus to which a generator, load, or switched shunt is connected or the bus itself.
Name
Identifies the name of the bus to which a generator, load, or switched shunt is connected or the bus itself.
ID
Identifies the ID of the generator, load, or switched shunt or the name of the injection group.
AutoCalc
If the value of AutoCalc is YES, the participation factor of the point is re-calculated with every use according to the AutoCalc Method setting. If the value of AutoCalc is NO, the participation factor is assumed fixed at its present value.
AutoCalc Method
Indicates how the participation factor of the point should be re-calculated. This re-calculation of the point is done with every use if AutoCalc is YES. For generators, the possible values of this field are :
SPECIFIED The participation factor is specified as a constant.
MAX GEN INC The participation factor is calculated as the difference between the generator’s maximum MW output and its present MW output. This option will not allow negative participation factors. If the present MW output is greater than the maximum MW output, the participation factor will be zero.
MAX GEN DEC The participation factor is calculated as the difference between the generator’s present MW output and its minimum MW output. This option will not allow negative participation factors. If the present MW output is less than the minimum MW output the participation factor will be zero.
MAX GEN MW The participation factor is set the same as the maximum MW output of the generator.
Field or Model Expression The participation factor is the value of the Field or Model Expression named as the AutoCalc Method.
For loads, the AutoCalc Method property can assume these possible values:
SPECIFIED The participation factor is specified as a constant.
LOAD MW The participation factor is set the same as the size of the load in MW.
Field or Model Expression The participation factor is the value of the Field or Model Expression named as the AutoCalc Method.
For switched shunts, the AutoCalc Method property can assume these possible values:
SPECIFIED The participation factor is specified as a constant.
MAX SHUNT INC The participation factor is calculated as the difference between the maximum Mvar output of the switched shunt and its present nominal Mvar output.
MAX SHUNT DEC The participation factor is calculated as the difference between the present nominal Mvar output and the minimum Mvar output of the switched shunt.
MAX SHUNT MVAR The participation factor is set the same as the maximum Mvar output of the switched shunt.
Field or Model Expression The participation factor is the value of the Field or Model Expression named as the AutoCalc Method.
For injection groups, the AutoCalc Method property can assume these possible values:
SPECIFIED The participation factor is specified as a constant.
Field or Model Expression The participation factor is the value of the Field or Model Expression named as the AutoCalc Method.
For buses, the AutoCalc Method property can assume these possible values:
Field or Model Expression The participation factor is the value of the Field or Model Expression named as the AutoCalc Method.
The AutoCalc Method field is important if the ParFac values should be updated automatically as changes are made to the case affecting the participation point object. If the AutoCalc field is set to YES, the rule defined by the AutoCalc Method field is used to recalculate the participation factor with every use. For example, if the AutoCalc Method is MAX GEN INC and AutoCalc is YES, the point’s participation factor will be updated to match the generator’s MW reserve every time the point is accessed.
This field is also useful if saving injection groups to an auxiliary file and using them with another case that might have a different generation dispatch or load profile. If the AutoCalc Method for a point is specified as GEN MAX INC, for example, and the point is loaded from an auxiliary file into another case, Simulator will re-calculate the point’s participation factor to match the generator’s positive MW reserve in that case if the AutoCalc field is set to YES.
When the value of the AutoCalc Method field is toggled, the point’s participation factor, shown in the ParFac field, will update to match the new definition. This happens regardless of how the AutoCalc field is set.
If AutoCalc is NO and the injection group is not intended to be used with any other case, then the AutoCalc Method field should either be ignored or set to SPECIFIED. When AutoCalc is NO, the ParFac field is enterable and can be changed.
ParFac
Indicates the participation factor of the participation point. The participation factor defines the relative contribution of the point to the total output of the injection group. The load, generation, or switched shunt change associated with each point is calculated based on the value of the participation factor, with values for points having the largest participation factors experiencing the greatest change.
The participation factor for injection group participation points indicates the relative contribution of the entire injection group to the total output of the injection group to which it belongs. The participation factors of the individual points in the injection group point further define the relative contribution of these points to the total output of the injection group. The following two injection groups provide an example of how injection group points impact the injection group to which they belong when the points are normalized for use:
| Injection Group 1 | Injection Group 2 | ||
|
Gen 1, ParFac = 50 Gen 2, ParFac = 30 InjectionGroup 2, ParFac = 20 |
Gen 5, ParFac = 40 Load 1, ParFac = 20 Load 2, ParFac = 20 |
||
| ParFac Total = 100 | ParFac Total = 80 |
When Injection Group 1 is used, the participation factors are normalized so that each element provides the following contribution:
Gen 1, Normalized ParFac = 50/100 = 0.5
Gen 2, Normalized ParFac = 30/100 = 0.3
Gen 5, Normalized ParFac = 20/100 * 40/80 = 0.1
Load 1, Normalized ParFac = 20/100 * 20/80 = 0.05
Load 2, Normalized ParFac = 20/100 * 20/80 = 0.05
Total Normalized = 1.0
To add points to the injection group, right-click on the Participation Point Records Display and select Insert from the local menu. This opens the Add Participation Points dialog.