The Electricity-theft Identification Method Based On Analysis Of The Characteristics Of Grid Electrical Parameters

Electricity-theft has already been a global problem, for the power generation and supply companies around the world are plagued by it for a long time. Electricity-theft will not only results in a huge loss of power, but also disrupts the supply order, brings huge economic losses to the electric power enterprise. In order to better investigating the electricity-theft problem and reducing the high line loss, a viable and accurate electricity-theft identification method is needed for the power generation and supply companies. On the basis of analyzing the characteristics and shortcomings of the previous anti-electricity-theft methods, a new method that relies on the electricity consumption information was proposed in this paper. Firstly, the line resistance, which won’t change along with the grid, was selected as a criterion reference from the perspective of network, based on analyzing the characteristics of the electrical parameters in the network. Secondly, the theoretical electricity-theft criterion was worked out on the basis of matrix addition theorem, and the estimation method for theft load was also given out. Furthermore, the theoretical criterion was been corrected as considering the actual measurement error and the ambient temperature. Thirdly, make the method practical and get the steady-state data for power flow calculation by excluding transient data from the telemetry data. As the electricity-theft power is large and can’t be measured, it always be regarded as a part of line losses in project, the line loss is much larger than the theoretical one. If the measured voltages are accurate, then the equivalent resistance of each branch can be calculated based on the measured data, and the difference between it and the actual line parameters will be negative for a time. The electricity-theft position can be found out accurately with this feature, and the theft load can be estimated also. Fourthly, the simulation, which was implemented in Matlab/Simulink platform, showed that this new method can well investigate and handle with electricity-theft, and also verify the validity of this criterion. This method is general and global for it is not limited in the form or location of electricity-theft while comparing with the methods before, and it provides a strong theoretical basis for anti-electricity-theft.