| Based on the theory of power distrbution, upstream power flow tracing was proposed. A power network could be converted to a circuit and marching upstream power flow tracing, the purpose is to get power chain containing the relationship between each load and power stream covering the relationship between each load and extracted power utilizing the theory of power distribution. Load-loss distribution coefficient, and load-extracted power flow distribution coefficient were given in the form of sinusoidal steady-state. The relation between each load and the line loss caused by it was established. The power flow distribution was clearer. The unity between the theory of upstream power flow tracing and the theory of power distribution was pointed out. Upstream power flow tracing contented to Kirchhoff’s current law and the law of conservation of power, thus the correctness and rationality was guaranteed. The example analysis gets the conclusion that in the single source power network, sinusoidal steady-state power follows the principle of impedance matching.In order to identify the electricity-theft correctly. In view of the distribution network with AMI, four criteria were proposed, they are impedance criterion, current criterion, voltage criterion and power criterion. By using the topology network and the user’s accurate voltage measurement, the users’impedances was got through matrix manipulations. Compare the impedance and the measured impedance, then electricity-theft was investigated. The method took the advantage of AMI getting the remote to the characteristics of the load data simultaneously, without collecting user electricity information on the scene. The simulation example proved the effectiveness and practicability of this method. This method is general and global for it is not limited in the form or location of electricity-theft comparing with before, provides theoretical support to AMI on electricity-theft identification. |
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