## What is iteration in power system?

The iterative process is continued till the change in magnitude of the bus voltages in successive iterations become less than a certain pre-specified tolerance level for all buses, i.e., To reduce the number of iterations, an acceleration factor α = 1.6 is considered to be a good value for power flow studies.

**What are the different types of buses in power system?**

Three major types of nodes or buses are identified in the power network.

- Load Bus, or P-Q Bus.
- Generator Bus, or P-V Bus.
- System Slack, or Swing Bus.
- Therefore, the swing bus voltage magnitude is specified and its voltage phase angle is usually chosen as the system reference and set equal to zero.
- Ahmed Faizan, M.Sc.

**Why do we go for iterative methods to solve load flow problems?**

Ø Why do we go for iterative methods to solve load problems? The load flow equations are nonlinear algebraic equations and so explicit solution is not possible. The solution of nonlinear equations can be obtained only by iterative numerical techniques.

### Which load flow method is best?

The rate of convergence of the Gauss Seidel method is slow (linear convergence characteristic), requiring a considerably greater number of iterations to obtain a solution than the NR method which has quadratic convergence characteristics and is the best among all methods from the standpoint of convergence.

**What is iteration in load flow analysis?**

Load Flow Analysis is iterative process. Though there are different techniques that used to figure out the flows of power and bus voltage magnitude.

**What are the methods of power flow?**

Raphson method, Gauss? Seidel method, fast decoupled load flow method, and direct current load flow method, use specific values of power generations and load demands of a selected network configuration to calculate system states and power flows.

## Which is not type of power system bus?

Depends on the quantity to be specified the buses are classified into three categories generation bus, load bus and slack bus….Classification of Power System Buses.

Type of Buses | Know or Specified Quantities | Unknown Quantities or Quantities to be determined. |
---|---|---|

Generation or P-V Bus | P, | V | | Q, δ |

Load or P-Q Bus | P, Q | | V |, δ |

**What is the main disadvantage of Gauss-Seidel method?**

Advantages: Faster, more reliable and results are accurate, require less number of iterations; Disadvantages: Program is more complex, memory is more complex.

**What are the disadvantages of GS method?**

Disadvantages of GS method:

- Increase of number of iterations directly with the increased number of buses.
- Slow rate of convergence and thus, large number of iterations.
- Effect on convergence due to choice of slack bus.

### What is the difference between GS and NR method?

In G-S method, the rate of convergence is slow and the convergence characteristic is linear while N-R method has quadrature convergence characteristics. Acceleration factors are used in G-S method for convergence. However, for large systems the N-R method is faster, more accurate and more reliable than the G-S method.

**What is disadvantages of Gauss-Seidel method?**