**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**12

# Search results for: network reconfiguration

##### 12 Loss Reduction and Reliability Improvement of Industrial Distribution System through Network Reconfiguration

**Authors:**
Ei Ei Phyu,
Kyaw Myo Lin,
Thin Thin Moe

**Abstract:**

The paper presents an approach to improve the reliability and reduce line losses of practical distribution system applying network reconfiguration. The change of the topology redirects the power flow within the distribution network to obtain better performance of the system. Practical distribution network (Pyigyitagon Industrial Zone (I)) is used as the case study network. The detailed calculations of the reliability indices are done by using analytical method and power flow calculation is performed by Newton-Rephason solver. The comparison of various network reconfiguration techniques are described with respect to power loss and reliability index levels. Finally, the optimal reconfigured network is selected among difference cases based on the two factors: the most reliable network and the least loss minimization.

**Keywords:**
Distribution system reliability,
loss reduction,
network reconfiguration,
reliability enhancement,
reliability indices.

##### 11 Advanced Hybrid Particle Swarm Optimization for Congestion and Power Loss Reduction in Distribution Networks with High Distributed Generation Penetration through Network Reconfiguration

**Authors:**
C. Iraklis,
G. Evmiridis,
A. Iraklis

**Abstract:**

Renewable energy sources and distributed power generation units already have an important role in electrical power generation. A mixture of different technologies penetrating the electrical grid, adds complexity in the management of distribution networks. High penetration of distributed power generation units creates node over-voltages, huge power losses, unreliable power management, reverse power flow and congestion. This paper presents an optimization algorithm capable of reducing congestion and power losses, both described as a function of weighted sum. Two factors that describe congestion are being proposed. An upgraded selective particle swarm optimization algorithm (SPSO) is used as a solution tool focusing on the technique of network reconfiguration. The upgraded SPSO algorithm is achieved with the addition of a heuristic algorithm specializing in reduction of power losses, with several scenarios being tested. Results show significant improvement in minimization of losses and congestion while achieving very small calculation times.

**Keywords:**
Congestion,
distribution networks,
loss reduction,
particle swarm optimization,
smart grid.

##### 10 Effects of Distributed Generation on Voltage Profile for Reconfiguration of Distribution Networks

**Authors:**
Mahdi Hayatdavudi,
Ali Reza Rajabi,
Mohammad Hassan Raouf,
Mojtaba Saeedimoghadam,
Amir Habibi

**Abstract:**

Generally, distributed generation units refer to small-scale electric power generators that produce electricity at a site close to the customer or an electric distribution system (in parallel mode). From the *customers’ point of view*, a potentially lower cost, higher service reliability, high power quality, increased energy efficiency, and energy independence can be the key points of a proper DG unit. Moreover, the use of renewable types of distributed generations such as wind, photovoltaic, geothermal or hydroelectric power can also provide significant environmental benefits. Therefore, it is of crucial importance to study their impacts on the distribution networks. A marked increase in Distributed Generation (DG), associated with medium voltage distribution networks, may be expected. Nowadays, distribution networks are planned for unidirectional power flows that are peculiar to passive systems, and voltage control is carried out exclusively by varying the tap position of the HV/MV transformer. This paper will compare different DG control methods and possible network reconfiguration aimed at assessing their effect on voltage profiles.

**Keywords:**
Distribution Feeder Reconfiguration (DFR),
Distributed Generator (DG),
Voltage Profile,
Control.

##### 9 Network Reconfiguration of Distribution System Using Artificial Bee Colony Algorithm

**Authors:**
S. Ganesh

**Abstract:**

Power distribution systems typically have tie and sectionalizing switches whose states determine the topological configuration of the network. The aim of network reconfiguration of the distribution network is to minimize the losses for a load arrangement at a particular time. Thus the objective function is to minimize the losses of the network by satisfying the distribution network constraints. The various constraints are radiality, voltage limits and the power balance condition. In this paper the status of the switches is obtained by using Artificial Bee Colony (ABC) algorithm. ABC is based on a particular intelligent behavior of honeybee swarms. ABC is developed based on inspecting the behaviors of real bees to find nectar and sharing the information of food sources to the bees in the hive. The proposed methodology has three stages. In stage one ABC is used to find the tie switches, in stage two the identified tie switches are checked for radiality constraint and if the radilaity constraint is satisfied then the procedure is proceeded to stage three otherwise the process is repeated. In stage three load flow analysis is performed. The process is repeated till the losses are minimized. The ABC is implemented to find the power flow path and the Forward Sweeper algorithm is used to calculate the power flow parameters. The proposed methodology is applied for a 33–bus single feeder distribution network using MATLAB.

**Keywords:**
Artificial Bee Colony (ABC) algorithm,
Distribution system,
Loss reduction,
Network reconfiguration.

##### 8 A New Approach for Network Reconfiguration Problem in Order to Deviation Bus Voltage Minimization with Regard to Probabilistic Load Model and DGs

**Authors:**
Mahmood Reza Shakarami,
Reza Sedaghati

**Abstract:**

Recently, distributed generation technologies have received much attention for the potential energy savings and reliability assurances that might be achieved as a result of their widespread adoption. The distribution feeder reconfiguration (DFR) is one of the most important control schemes in the distribution networks, which can be affected by DGs. This paper presents a new approach to DFR at the distribution networks considering wind turbines. The main objective of the DFR is to minimize the deviation of the bus voltage. Since the DFR is a nonlinear optimization problem, we apply the Adaptive Modified Firefly Optimization (AMFO) approach to solve it. As a result of the conflicting behavior of the single- objective function, a fuzzy based clustering technique is employed to reach the set of optimal solutions called Pareto solutions. The approach is tested on the IEEE 32-bus standard test system.

**Keywords:**
Adaptive Modified Firefly Optimization (AMFO),
Pareto solutions,
feeder reconfiguration,
wind turbines,
bus voltage.

##### 7 Heuristic Optimization Techniques for Network Reconfiguration in Distribution System

**Authors:**
A. Charlangsut,
N. Rugthaicharoencheep,
S. Auchariyamet

**Abstract:**

**Keywords:**
Network Reconfiguration,
Optimization Techniques,
Distribution System

##### 6 Network Reconfiguration for Load Balancing in Distribution System with Distributed Generation and Capacitor Placement

**Authors:**
T. Lantharthong,
N. Rugthaicharoencheep

**Abstract:**

**Keywords:**
Network reconfiguration,
Distributed generation
Capacitor placement,
Load balancing,
Optimization technique

##### 5 Distributed Load Flow Analysis using Graph Theory

**Authors:**
D. P. Sharma,
A. Chaturvedi,
G.Purohit ,
R.Shivarudraswamy

**Abstract:**

**Keywords:**
Radial Distribution network,
Graph,
Load-flow,
Array.

##### 4 An Hybrid Approach for Loss Reduction in Distribution Systems using Harmony Search Algorithm

**Authors:**
R. Srinivasa Rao

**Abstract:**

**Keywords:**
Capacitor Control,
Network Reconfiguration,
HarmonySearch Algorithm,
Loss Reduction,
Voltage Profile.

##### 3 A New Distribution Network Reconfiguration Approach using a Tree Model

**Authors:**
E. Dolatdar,
S. Soleymani,
B. Mozafari

**Abstract:**

Power loss reduction is one of the main targets in power industry and so in this paper, the problem of finding the optimal configuration of a radial distribution system for loss reduction is considered. Optimal reconfiguration involves the selection of the best set of branches to be opened ,one each from each loop, for reducing resistive line losses , and reliving overloads on feeders by shifting the load to adjacent feeders. However ,since there are many candidate switching combinations in the system ,the feeder reconfiguration is a complicated problem. In this paper a new approach is proposed based on a simple optimum loss calculation by determining optimal trees of the given network. From graph theory a distribution network can be represented with a graph that consists a set of nodes and branches. In fact this problem can be viewed as a problem of determining an optimal tree of the graph which simultaneously ensure radial structure of each candidate topology .In this method the refined genetic algorithm is also set up and some improvements of algorithm are made on chromosome coding. In this paper an implementation of the algorithm presented by [7] is applied by modifying in load flow program and a comparison of this method with the proposed method is employed. In [7] an algorithm is proposed that the choice of the switches to be opened is based on simple heuristic rules. This algorithm reduce the number of load flow runs and also reduce the switching combinations to a fewer number and gives the optimum solution. To demonstrate the validity of these methods computer simulations with PSAT and MATLAB programs are carried out on 33-bus test system. The results show that the performance of the proposed method is better than [7] method and also other methods.

**Keywords:**
Distribution System,
Reconfiguration,
Loss Reduction ,
Graph Theory ,
Optimization ,
Genetic Algorithm

##### 2 A New Heuristic Approach for Optimal Network Reconfiguration in Distribution Systems

**Authors:**
R. Srinivasa Rao,
S. V. L. Narasimham

**Abstract:**

**Keywords:**
Distribution system,
network reconfiguration,
powerloss reduction,
radial network,
heuristic technique.

##### 1 Optimization of Distribution Network Configuration for Loss Reduction Using Artificial Bee Colony Algorithm

**Authors:**
R. Srinivasa Rao,
S.V.L. Narasimham,
M. Ramalingaraju

**Abstract:**

Network reconfiguration in distribution system is realized by changing the status of sectionalizing switches to reduce the power loss in the system. This paper presents a new method which applies an artificial bee colony algorithm (ABC) for determining the sectionalizing switch to be operated in order to solve the distribution system loss minimization problem. The ABC algorithm is a new population based metaheuristic approach inspired by intelligent foraging behavior of honeybee swarm. The advantage of ABC algorithm is that it does not require external parameters such as cross over rate and mutation rate as in case of genetic algorithm and differential evolution and it is hard to determine these parameters in prior. The other advantage is that the global search ability in the algorithm is implemented by introducing neighborhood source production mechanism which is a similar to mutation process. To demonstrate the validity of the proposed algorithm, computer simulations are carried out on 14, 33, and 119-bus systems and compared with different approaches available in the literature. The proposed method has outperformed the other methods in terms of the quality of solution and computational efficiency.

**Keywords:**
Distribution system,
Network reconfiguration,
Loss
reduction,
Artificial Bee Colony Algorithm.