This section will discuss about the standard test system consider to test our visualization technique. IEEE 30 bus system is a small system and can be visualized even in Power World but as the size increases to IEEE 118 and IEEE 300 bus system then a unique representation is required which will be discussed in section 3. IEEE 300 is a massive system and its visualization is a challenging task to be visualized in Power World as shown in figure 1. A small bus system is possible to be visualized like IEEE 39 test case but large power system visualization in PowerWorld will be a challenging task because important nodes or branches will not be intuitively visible to take a quick decision which is the main objective of visualization to have clear visuals with specified goals which facilitate to retrieve information from layout. The test system are standard test system of IEEE and they are available from [17]
The author of [18] shows the result that the force directed graph layout is an efficient and high quality algorithm which combines a multilevel approach and effectively overcomes local minimums. “Force directed graph layout is a physics based approach to a graph layout that treats the vertices as repelling charged particles and the edges connecting them as springs”[19]. Force directed algorithm is being used in other researches as mentioned in [9] which shows that the force-directed layout algorithm are capable of representing large bus system e.g. 50000 Buses. Two most important reason to consider force-directed layout algorithm is (i) Physics; (ii) Representation of Large system.
The weighted graph visualization is simply a graph drawing which is drawn by adding weight on branches as an extra dimention into the graph layout to further improve the analytical capability of a graph layout. Similar work has been reported by authors of [9]. Our methodology uses an admittance weighted on the lines as given in IEEE test cases which can be used to visualize network. This technique generates a layout where nodes are placed as per the impedance between the buses shown as branch and the weights on the branches are the admittance which shows electrically meaningful network structure. Admittance of the line shows how electrically close lines are, so higher value of admittance will shows “close electrical proximity between two buses”.