Solution Method
This setting is used to specify which method will be used to determine the nodal solution.
Shift Factors
This is generally the recommended and fastest approach. This method calculates shift factors for each bus/branch combination that represent the change in flow on the branch for each MW injection at the bus. Shift factor values are used to enforce branch and corridor constraints which ensure that the system is operating within its limits. The problem size can be controlled by the Shift factor tolerance value.
Angles
This method directly uses Kirchhoff’s law to model the flow in and out of each bus and to calculate the angles at each bus. The angles are then used to enforce the branch and corridor constraints. This method is theoretically equivalent to using shift factors when a shift factor tolerance of 0 is used. See the Nodal Angles Solution Method article for more details. Even when this method is being used, shift factors are still required for loss sensitivities and LODF derivations. This approach is recommended when a high level of precision is needed in the branch flow calculations. When using this method the MW Mismatch values will be zero.
NOTE: The Gurobi Solver is generally recommended when using the Angles method.
Solution Method