Graphical User Interface Load Flow Solution of Radial Distribution Network

Author Name(s): G.Pranava, Gurram Ravindranth, K.Ramesh Reddy
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The objective of design, construction and operation of distribution system is to achieve quality of supply and economy and the engineer has been encountering many difficulties of manual calculations through the sheer volume of operations required, complex networks and dynamic phenomena. To overcome the difficulty, various tools have been developed like reduced scale models, analogue models and simulation models. A graphical user interface or simulation tool for a Distribution Substation has been developed. The aspects of minimization of losses and voltage profile improvement of the radial distribution system are kept in view while designing the tool along with reconfiguration of distribution network and optimal capacitor placements. The Tellegen theorem algorithm approach and Adjoint Network methods are used to obtain the load flow solution for the radial distribution with only main feeder and laterals also. This tool gives the pictorial representation of the bus arrangement and their corresponding voltages of the Distribution Substation feeder and the power losses.


The Engineer in the Distribution Substation requires the first hand information of the Substation for further analysis such as planning for the expansion of the system, designing the protection equipment for the system and load forecasting. The information he requires includes the Substation feeder information like the rating of the Transformer,the feeder buses arrangement, their line impedances, load data at the buses, Voltages  at the buses and power losses of the system. Many researchers obtained different algorithms to obtain the voltages and power losses with the given data. An attempt is made to obtain the solution with the already executed algorithms. The representation of the input data of the system along with the respective solutions with graphical representation of buses of the feeder is executed in this paper. The bus number along with their voltages give a quick overall pictureof the substation. Load flow solution [6-7] is required first before solving any other problem in Radial distribution network. [1-2] give the load flow solution of the distribution network with main feeder and laterals dealt in this paper.  Reconfiguration of the network [3] and [8] gives a better solution for the network compared with the existing network. Adjoint Network [9] of a network is applied in this paper to obtain load flow solution for load changes. Optimal placement of capacitor is another issue of the distribution networks [4,10], which is dealt in this paper using Adjoint Network and Particle Swarm Optimization methods


An Electric Power Distribution simulator has been developed which solves the Radial Distribution Network considerations. At a glance the Distribution Engineer can view both the data and the pictorial view of the substation with their node numbers and their corresponding voltages, which is the exclusive feature of this simulator. With the given data, the simulator develops the picture of the substation connection diagram. The interconnection of the nodes is clearly viewable in these windows. It looks into the important considerations like reconfiguration, load flow when load changes and optimal capacitor placement.

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