Electricity distribution networks are subject to random faults. On occurrence of a fault in the distribution network, the circuit breaker on the faulty feeder trips, which disconnects supply to all customers connected to that feeder. Once the fault is located, the faulty component is isolated and then repaired. The cost of isolating and repairing faults depends on the way the network is configu...

In this paper, Artificial Neural Network, one of the Artificial Intelligence (AI) techniques, for the Volt / Var control in power distribution systems with dispersed generation (DG) is proposed. Artificial neural networks have been considered due to their ability for real time control, simpler calculations and adaptability to different operating conditions. Neuro-controllers are much more effec...

This paper presents a software package whose aim is to provide a tool to be used for reliability indices analysis in radial distribution system. It contains all the main elements found in practical system. The software package employs the Graphical User Interface (GUI) capabilities of Matlab. The main advantage of the proposed package is that the reliability indices analysis can find in differe...

In this work, thermo – elastic analysis for functionally graded thick – walled cylinder with temperature - dependent material properties at steady condition is carried out. The length of cylinder is infinite and loading is consist of internal hydrostatic pressure and temperature gradient. All of physical and mechanical properties expect the Poisson's ratio are considered as multiplied an expone...

In this paper, simultaneous placement of distributed generation, capacitor bank and protective devices are utilized to improve the efficiency of the distribution network. The objectives of the problem are reduction of active and reactive power losses, improvement of voltage profile and reliability indices and increasing distribution companies’ profit. The combination of firefly algorithm, parti...

This paper presents a novel power flow formulation and an effective solution method for general unbalanced radial distribution systems. Comprehensive models are considered including lines, switches, transformers, shunt capacitors, cogenerators, and several types of loads. A new problem formulation of three-phase distribution power flow equations taking into account the radial structure of the d...

Recently integrating Embedded Generation units (EGs) in the distribution network gain popularity due to their overall positive impacts on the system they serve. Minimizing the system real power losses and improving the voltage profile of the system are just to name a few. However, suboptimal EG penetration and location might increase the system losses. This paper investigates the EG rating by f...

Optimal placement and sizing of DG in distribution network is an optimization problem with continuous and discrete variables. Many researchers have used evolutionary methods for finding the optimal DG placement and sizing. This paper proposes a hybrid algorithm PSO&HBMO for optimal placement and sizing of distributed generation (DG) in radial distribution system to minimize the total power loss...

Original scientific paper The paper analyzes the possibility of reducing active power losses in power system, constrained by regulated voltage levels, by implementing appropriate distributed generation capacity. The objectives of this paper were achieved by developing hybrid methods based on artificial neural network and genetic algorithm. Methods have been developed to determine the impact of ...

Directional and non directional overcurrent protection are well established methods of providing either primary or backup protection on distribution networks. Compared to unit protection which only protects a specific piece of equipment, such as a transformer or feeder, overcurrent protection has the advantage of being able to provide protection to large sections of network. To do this the over...