equations could be got using scheme III. After analysis parison, the reasons are as follows: Р• The diagonal element related to node 4 is just a little smaller than the one related to node 6, so eliminate node 4 first will not decrease accuracy. The scheme could plete pivoting approximately. Р• 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 of node 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 of node 6, producing a value in the normal range. РTABLE III. REORDERED NODES USING SCHEME THREEРTABLE IV. E OF NEWTON POWER FLOW USING DIFFERENT SCHMEMS OF NODE ORDERING
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