Analysis of the Load Flow Problem in Power System Planning Studies

Abstract

Load flow is an important tool used by power engineers for planning, to determine the best operation for a power system and exchange of power between utility companies. In order to have an efficient operating power system, it is necessary to determine which method is suitable and efficient for the system's load flow analysis. A power flow analysis method may take a long time and therefore prevent achieving an accurate result to a power flow solution because of continuous changes in power demand and generations. This paper presents analysis of the load flow problem in power system planning studies. The numerical methods: Gauss-Seidel, Newton-Raphson and Fast Decoupled methods were compared for a power flow analysis solution. Simulation is carried out using Matlab for test cases of IEEE 9-Bus, IEEE 30-Bus and IEEE 57-Bus system. The simulation results were compared for number of iteration, computational time, tolerance value and convergence. The compared results show that Newton-Raphson is the most reliable method because it has the least number of iteration and converges faster.

A comparative study on common power flow techniques in the power distribution system of the Tehran metro

“…In the last few decades, for solving load flow analysis problems, several numerical assessment methods have been proposed. It can be said that the most commonly used iterative methods are the Gauss-Seidel (GS), the Fast-Decoupled (FD), and the FD methods [5,33]. According to the reference [5], when performing load flow assessment, the first step is to form the Y-bus admittance using the transmission line and the transformer input data.…”

“…It can be said that the most commonly used iterative methods are the Gauss-Seidel (GS), the Fast-Decoupled (FD), and the FD methods [5,33]. According to the reference [5], when performing load flow assessment, the first step is to form the Y-bus admittance using the transmission line and the transformer input data. The nodal formula for a study of the power system network using the Y-bus can be given as follows:…”

“…A load flow assessment method might take a long time, and hence prevent the achievement of an accurate result for a power flow solution due to continuous changes in power generation and demand. The essential data achieved from a load flow study is the magnitude and phase angle of the voltage at every feeder and bus, and the real and reactive power flowing in every line [5,6]. Commercial power systems are usually too complex to allow handling solutions for the power flow.…”

Regulating Reserve Dynamic Scheduling and Optimal Allocation in Systems with a Large Share of Wind-Power Generation

“…GS is the method of successive displacement for solving the linear system of equations with iterative techniques. It is quite easy to program, and one iteration is done very quickly, but the number of iterations increases with the number of nodes in the network [31,32]. The NR method uses equations in polar form and the iterative process to find the approximation of the root of a function.…”

Power Systems Analysis Software for Fast Process Automation

“…Various difficulties of load flow calculations and comparison of load flow calculation methods have been discussed [6]. Due to the complexity of power systems being analyzed, which results in a long analysis time, the developed software is mainly used for educational and research activities, as well as for the planning of power systems [7 -10].…”