Difference between Newton Raphson and Fast Decoupled Load flow methods
Contents
Comparison between Newton Raphson and Fast Decoupled
- The Key Difference between Newton Raphson and Fast Decoupled are in the below comparison chart.
Comparison Chart
Fast Decoupled | Newton Raphson | |
---|---|---|
Co-ordinates | Polar coordinates | Polar co-ordinates are preferred as rectangular coordinates occupy more memory. |
Arithmetical operations | Less than Newton Raphson. | Elements of jacobian to be calculated in each iteration . |
Time | Less time compared to NR and GS methods. | Time/iteration is 7 times of GS and increases with an increase in the number of buses. |
Convergence | Geometric convergence | Quadratic convergence |
No. of iterations | Only 2 to 5 iterations for practical accuracies. | Very less (3 to 5 only) for large system and is practically constant. |
Slack bus selection | Moderate | Sensitivity to this is minimal |
Accuracy | Moderate | More accurate |
Memory | Only 60% of memory when compared to NR method. | Large memory even with compact storage scheme |
Usage/application | Optimization studies, multi-load flow studies, contingency evaluation for security assessment and enhancement. | A large system, ill-conditioned problems, optimal load flow studies. |
Programming Logic | Moderate | Very difficult |
Reliability | More reliable than NR method. | Also, Reliable for large system |
More Difference
- Difference between Gauss Seidel and Fast Decoupled
- Difference between Gauss Seidel and Newton Raphson