Question

Which method is preferred for solving the power flow problem in small to medium-sized power systems?

• A. Newton-Raphson method
• B. Gauss-Seidel method
• C. Decoupled power flow method
• D. Backward/Forward Sweep method

Hint:

Gauss-Seidel is the preferred power flow method for small and medium-sized systems due to simplicity and low computational load.

Answer 1

The Correct Option is B

Step 1: Know the methods
- Newton-Raphson: fast convergence, but complex and suitable for large systems.
- Gauss-Seidel: easy to implement, less memory, slower convergence but ideal for small/medium systems.
Step 2: Use case for Gauss-Seidel
Gauss-Seidel works well for radial or weakly meshed networks, typical of distribution systems.
Step 3: Eliminate other options
- Decoupled and Newton-Raphson are better for large systems.
- Backward/Forward Sweep is best for radial distribution but not general.
Hence, Option (2) is correct.