Difference between Gauss Seidel and Fast Decoupled (Comparison Chart)

Difference between Gauss Seidel and Fast Decoupled Load flow methods

Contents

The Key Difference between Gauss Seidel and Fast Decoupled are in the below comparison chart.

	Gauss Seidel	Fast Decoupled
Co-ordinates	Works well with rectangular coordinates.	Polar coordinates
Arithmetical operations	Least in number to complete one iteration.	Less than Newton Raphson.
Time	Requires less time per iteration, but increases with an increase in the number of buses.	Less time compared to NR and GS methods.
Convergence	Linear convergence	Geometric convergence
No. of iterations	A large number, increases with an increase in buses.	Only 2 to 5 iterations for practical accuracies.
Slack bus selection	Choice of slack bus affects convergence adversely	Moderate
Accuracy	Less accurate	Moderate
Memory	Less memory because of the sparsity of the matrix.	Only 60% of memory when compared to NR method.
Usage/application	Small size system	Optimization studies, multi-load flow studies, contingency evaluation for security assessment and enhancement.
Programming Logic	Easy	Moderate
Reliability	Reliable only for a small system.	More reliable than NR method.