Azhar Khairuddin

Reconfiguration of Radial Electrical Distribution Network Through Minimum-Current Circular-Updating-Mechanism Method

Reconfiguration of the Radial Electrical Distribution Network (ROREDN) is one vital analysis to optimize and control the electrical distribution system. This paper presents a new heuristic method for ROREDN based on minimum branch current in the system. A circular updating mechanism is presented in which every open switch is acquired and updated. The proposed technique has been tested and compared to other existing ones on four hypothetical electrical distribution networks. The method has remarkably solved the problems accurately with fast computational times.

A novel method for optimal placing wind turbines in a wind farm using particle swarm optimization (PSO)

In this paper, for the first time a particle swarm optimization (PSO) method is utilized to optimize placing of wind turbines in a wind park. The location of each wind turbine could be freely adjusted within a predefined cell in order to maximize the generated energy. Simulated results and graphs are carried out to prove that the present study is improved wind farm efficiency and extract more electrical power in respect of the total costs.

Two Circular-Updating Hybrid Heuristic Methods for Minimum-Loss Reconfiguration of Electrical Distribution Network

This paper presents two hybrid heuristic methods for reconfiguration of the radial electrical distribution system. The first stage of the proposed techniques is a circular minimum-branch-current updating mechanism to bypass the local optimum points. Then, by a circular neighbor-chain updating technique, the best known configuration is obtained. The proposed approaches have been tested on the six well-known electrical distribution networks. The results show that the proposed methods have remarkably achieved the best-known optimum solution with more reliability, accuracy and efficiency than many other published methods.

A review on reconfiguration of radial electrical distribution network through heuristic methods

Reconfiguration of Radial Electrical Distribution Network (ROREDN) is one vital analysis to optimize and control the electrical distribution system. This paper explained the application and objectives of ROREDN. There are considerable Heuristic Methods (HMs) presented by researcher for ROREDN as optimization approaches. This paper also reviewed some important strategies of HMs. The research represents that in the case of optimization methods, HMs could have remarkably solved the problems simple with fast computational times.

A multi-objective Bees Algorithm for optimum allocation of FACTS devices for restructured power system

In this paper, a novel multi-objective Bees Algorithm (MOBA) is used for the optimal allocation of FACTS devices in restructured power system. To enhance the available transfer capability (ATC) of power transactions between source and sink areas and minimizing the overall system cost function, which comprises of the investments costs of FACTS devices and generation cost the problem is formulated as multi-objective optimization. Three types of FACTS are simulated in this study namely Thyristor Controlled Series Compensator (TCSC), Static Var Compensator (SVC) and Thyristor Controlled Phase Shift Transformer (TCPST). An IEEE30 bus system is used to demonstrate the effectiveness of the algorithm as an optimization tool. A Non-Dominated Sorting GA-II technique configured to the same purpose is used for validation purposes. The results obtained are encouraging

A comparison of voltage stability indices

The stressful condition of power system and high transmission losses leads to voltage security and reliability problems of system operation. If the voltage stability is not assessed and the problems occurred are not mitigated properly, cascading events may occur and this may lead to voltage collapse or blackout events. Therefore, there is a need to assess the voltage stability in order to detect the voltage collapse point and mitigate it when it occurs. This paper aims to compare four existing voltage stability index performance towards reactive and real power load changes. The performances are analyzed theoretically, and using simulation on IEEE 30-bus test system. Total power loss is also observed for each case. The comparison shows that all indices are prone to either reactive or real load power changes only. None of the indices are sensitive towards both power loads changes. Meanwhile, the total power loss is mostly contributed by reactive power losses.

Optimal Sizing and Siting of Distributed Generators by a Weighted Exhaustive Search

Abstract Dispersed generation generally refers to power generation on the customer side of the power network. This article demonstrates the improvement in network parameters that could be achieved by the usage of single and multiple distributed generation (DG) units in three selected standard networks. A reliable multi-variable method is suggested for finding the optimal installation point and size of distributed generation units. Their sites and sizes are recognized by the implementation of the proposed method with an exhaustive search. Optimization is applied on network total active and reactive losses together with voltage variation. IEEE 6-, 14-, and 30-bus standard networks are selected as study cases. The total active and reactive power losses are minimized, while the voltage profile is improved by installing distributed generation units on the recognized optimal points with the achieved optimal size.

Reconfiguration of Radial Electrical Distribution Network through Neighbor-Chain Updating method

This paper presents new heuristic method for Reconfiguration of Radial Electrical Distribution Network (ROREDN) based on a circular Neighbor-Chain Updating mechanism. The theory of the proposed method is to exchange every open switch of the initial configuration with its best neighbor switch. The proposed technique has been tested and compared to other existing ones on two hypothetical electrical distribution networks. The results show that this method has a significant contribution in finding optimal configuration and can be applied separately or with other optimization approaches to improve the accuracy of final solution.

A Parallel Bees Algorithm for ATC Enhancement in Modern Electrical Network

This paper presents a parallel-based methodology for placement of Flexible AC Transmission Systems (FACTS) devices in order to reduce the time it takes to reach a solution while maximizing the available transfer capability (ATC) of a given power system. The Parallel Bees Algorithms (PBA) simultaneously searches the location, size and types of FACTS devices to enhance ATC between the source and sink area. Four types of emerging FACTS devices are used namely, Thyristor Controlled Series Compensator (TCSC), Static Var Compensator (SVC), Unified Power Flow Controller (UPFC) and Thyristor Controlled Phase Shift Tranformer (TCPST). The IEEE118 Bus system is used to illustrate the applicability of the proposed algorithm to enhance ATC effectively. The results obtained are very encouraging and compared to a Bees Algorithm (BA), Genetic Algorithm (GA) and Parallel Genetic Algorithms (PGA). The results show that parallel computing technique can be used effectively to reduce time to reach a solution for large scale network and FACTS devices have proven their utility for ATC improvement.

A new method for real power transfer allocation using modified nodal equations

This paper proposes a new method to identify the real power transfer between generators and load using modified nodal equations. Based on solved load flow results, the method partitions the Y-bus matrix to decompose the current of the load buses as a function of the generatorspsila current and load voltages. Then it uses the modified admittance matrix to decompose the load voltage dependent term into components of generator dependent terms. Finally using these two decompositions of current and voltage terms, the real power transfer between loads and generators are obtained. The effectiveness of the proposed method is demonstrated by using a simple 5-bus system and the practical 25-bus equivalent power system of south Malaysia. The proposed methodology provides reasonable and acceptable results to real power transfer allocation.