An Improved Approach to Theoretical Losses Analysis of Oil Field Distribution Networks

Not considering the periodic fast fluctuation of the loads of oil pumps, the results of traditional methods of theoretical line losses calculation are much lower than that measured in the practice. To solve above problem, an improved approach is put forward. The distinguishing feature of the loads of oil pumps, i.e., the active power varies periodically with its averaged value not changed while the reactive power maintains approximately unchanged, is made full used of. The active power of an oil pump is formulated in a sine form. In calculation of losses in a feeder or a transformer with many oil pumps, the integral function is simplified by utilizing the orthogonal behavior of sine functions. Combining the proposed approach with the effective current based method, the theoretical losses calculation with hybrid loads of oil pumps and residential customers is deduced. The way to further improve the proposed approach by taking the losses of the downstream devices is discussed. The loss of a typical feeder with 19 loads of Daqing oil filed is calculated by the proposed approach and the traditional method, respectively. Comparison with the measured value shows that the proposed approach is feasible and more accurate.