linear equations could be got using scheme III. After analysis parison, the reasons are as follows: ? The diagonal element related tonode 4 is just a little smaller than the one related tonode 6, so eliminate node 4 first will not decrease accuracy. The scheme could plete pivoting approximately. ? Fewer operations in scheme III reduce the rounding error of calculator floating-point numbers. Especially, if eliminate node 6 first, very small value might be added to diagonal element ofnode 2 and node 5, which would cause serious rounding error. While, if eliminate node 4 first, a sizable value will be added to diagonal element ofnode 6, producing a value in the normal range. TABLE III. REORDERED NODES USING SCHEME THREE TABLE IV. E OF NEWTON POWER FLOW USING DIFFERENT SCHMEMS OF NODE ORDERING
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