This paper presents a new line flow based weighted least absolute value (LFWLAV) technique forpower systems making use of line flows, bus power injections and bus voltage magnitudes as the measurement vector has been suggested and it has been solved through BBO and WIPSO methods. State variables are estimated by means of constant, line flow based jacobian matrix developed from the network equations. The proposed selection of state variables has been advantageous as the jacobian matrix turns out to be constant which reduces the computational burden. Moreover, the suggested technique generates an output which gives a suggestion related to the overloaded lines and limit violated buses instantly rather than calculating them through separate equations. Weighted Least Squares (WLS) technique has been applied for solving the proposed line flow based state equations in the absence as well as presence of bad measurements and the results are validated against those obtained using the conventional WLAV technique. The effectiveness of the proposed method was examined by computer simulations through three test systems: (1) 14-bus IEEE test system, (2) 30bus IEEE test system and (3) 57-bus IEEE test system. Its convergence and calculation time had been determined cautiously and when compared with options acquired with the aid of the standard WLAV method. The results show that the proposed LFWLAV method spends less execution time than the standard method does with similar convergence characteristics.
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