From GridLAB-D Wiki

This project is to implement a method to link the distribution and transmission of GridLAB-D models for a complete powerflow analysis and add a greater level of detail in modeling a complete system. The final product should solve the power flow from a generator all the way down to individual loads.

# Implementation

The implementation of the Gauss-Seidel Powerflow solver will take the path outlined below. Stage 1 will affect mostly the **powerflow** module. Stage 2 will affect the **powerflow** and possibly the **network** module.

- Integrate Gauss-Seidel into
**powerflow**module (distribution systems)- Object changes to reflect Gauss-Seidel method
- Node √
- Link √
- Transformer √

- Method to choose solver √
- Solving constraints
- Iteration limits √
- Precision limits √

- Validate against known models √

- Object changes to reflect Gauss-Seidel method
- Integrate transmission and distribution power flow solvers
- Create integrating object (substation?)
- Handle 3-phase to positive sequence interface
- Unbalanced power considerations
- Ability to handle 4 - 5 feeders

- Integration/interaction of modules (Powerflow and Network)
- Create necessary secondary objects
- Switches
- Phase shifters
- HVDC intertie

- Validate against known models

- Create integrating object (substation?)