Smarajit Ghosh

Fuzzy Distribution Load Flow

In this paper, a fuzzy model for distribution system operation is presented. Uncertainties in loads are modeled as fuzzy numbers. A voltage stability index for each node of radial distribution networks is also proposed. The conditions for voltage collapse to occur are easily derived from this voltage stability index. Among the results, one obtains possibility distributions for substation current, voltage stability index, real and reactive power losses, etc. A general discussion on the results, along with the advantages and disadvantages of the approach, is presented.

A Novel Approach to Distribution Planning in an Unstructured Environment

Conductor layout plays a vital role in distribution planning. The factors such as cost associated with conductor layout, the capacity of substations and the distance of the load point from the substation is to be considered while determining the optimal conductor layout. Here in this paper a novel approach of distribution planning is proposed. In this paper a proposal for a method for locating an optimum site for a substation which has the minimum distance from the various load points is given further the conductor layout to connect the various load points using the AHP technique is suggested in this paper. By combining the GA and the AHP technique it is possible to optimize the locations of substation and the conductor layout. The results of the discussed techniques will lead to a configuration of substation that will minimize substation construction cost. It will further lower long range distribution expenses as it will lead to optimum feeder path. The application of the proposed methodology to a case study is presented.

Distribution Planning Based on Reliability and Contingency Criteria

Conductor layout plays a vital role in distribution planning. Here in this paper we suggest the distribution planning by the means of Analytical Hierarchy Process (AHP) where we take into consideration some aspects of reliability such as miles of conductor, feeder failures, customer interruption, maximum interruption, estimated relative cost. The results of the discussed techniques will lead to a configuration of substation that will minimize substation construction cost. It will further lower long range distribution expenses as it will lead to optimum feeder path. The application of the proposed methodology to a case study is presented.

A Hybrid Model of Distribution Planning

356 Abstract—Conductor layout plays a vital role in distribution planning. Here in this paper we suggest the distribution planning by the means of a hybrid model which includes Taguchi and Analytical Hierarchy Process (AHP) where we take into consideration some aspects of reliability such as miles of conductor, feeder failures, customer interruption, maximum interruption, estimated relative cost. The method suggested here firstly determines the priority of these aspects of reliability and then it determines the conductor layout based on these aspects on the determined priority manner. The results of the discussed techniques will lead to a configuration of substation that will minimize substation construction cost. It will further lower long range distribution expenses as it will lead to optimum feeder path. The application of the proposed methodology to a case study is presented.

Power Distribution Planning Using Multi-Criteria Decision Making Method

Conductor layout plays a vital role in distribution planning. This paper presents an improved mathematical model to optimize the network routing problem. The model was formulated to minimize the feeder routes subject to a set of constraints. The computational results of a devised sample problem indicate that the developed optimization model is adequate for planning of distribution systems. Here in this paper we suggest the distribution planning by the means of a hybrid model which includes Taguchi and Analytical Hierarchy Process (AHP) and Technique of Order Preference by Similarity to Ideal Solution (TOPSIS) where we take into consideration some aspects of reliability such as miles of conductor, feeder failures, customer interruption, maximum interruption, estimated relative cost. The method suggested here firstly determines the priority of these aspects of reliability and then it determines the weight of these factors and ultimately distribution planning has been carried out by Technique of Order Preference by Similarity to Ideal Solution (TOPSIS). The results of the discussed techniques will lead to lower long range distribution expenses as it will lead to optimum feeder path.

A Fuzzy Based Efficient Load Flow Analysis

414 Abstract—Load flow calculation is one of the most basic problems in power engineering. The repetitive solution of a large set of linear equations in load flow problem is one of the most time consuming parts of power systems simulations. Load flows are calculated using the traditional method such as Gauss Seidel or Newton Raphson methods. Gauss Seidel algorithm is an iterative numerical procedure and in this method the number of iteration depends on the acceleration factor (α). Here we attempt to choose the acceleration factor (α) using fuzzy logic technique so as to minimize the number of iteration and get the result in minimum required time. Comparison of the method with traditional method has been shown in the paper which proves the validity of the result. The paper shows as to how the application of Fuzzy technique in choosing an appropriate acceleration factor reduces the number of iteration and helps in obtaing the solution at a faster rate with optimum number of iterationThe simulation in carried out in MATLAB environment.

An Efficient Algorithm for Loss Minimization via Network Reconfiguration

This paper reports on loss minimization via network reconfiguration using heuristic rules. The proposed method takes a smaller number of switchings and less CPU time. The effectiveness of the proposed method is demonstrated by two examples.

Enhancement of Loading of Radial Distribution Networks Using Optimal Conductor Size

126 Abstract—In this paper, an attempt has been made to enhance the loading of radial distribution by selection of proper conductor. The critical values of total real power load (TPL) and total reactive power load (TQL) for constant power are derived out for the sub-station voltage of 1.0 pu. for 69-node radial distribution network. The proposed method will reduce the real and reactive power losses, improves voltage profile and enhances the loading capability of distribution network. The voltage deviation is reduced to ±10%.The superiority of the proposed method has been established by ±6% from ±10% taking results iteratively. Using network reconfiguration, loading is further increased.