Method for measuring maximum and minimum electrical energy depletion in medium voltage power distribution network

Abstract

This invention relates to a measurement method for the maximum and minimum power consumption of medium- pressure power distribution network and belongs to power system automatic measurement technique field. The method is the following: first to calculate the resistance of power network circuit and transformer and to get resistance array of power distribution network joints; to get power distribution consumption power through partitioned matrix; to get the maximum and minimum equivalent resistance linear plug function between the head current of the given power distribution network though the given maximum and minimum equivalent resistance of the given power distribution head current; according to the measurement of each phase of the distribution network to calculate the maximum and minimum equivalent resistance and finally to calculate the maximum and minimum power consumption in the given time lag of the distribution network. This invention can judge whether the distribution network has leakage phenomenon or calculation errors.

Description

technical field [0001] The invention relates to a method for measuring the maximum and minimum power loss of a medium-voltage distribution network, and belongs to the technical field of automatic measurement of electric power systems. technical background [0002] At present, except for a few medium-voltage distribution networks equipped with distribution automation systems and equipped with distribution load measurement functions as pilot projects, most medium-voltage distribution networks lack distribution load measurement devices. If a distribution load measurement device is installed in the medium-voltage distribution network, the communication problem must also be solved, which requires a large amount of investment. Due to the lack of operating data of distribution loads, the "Guidelines for the Calculation of Electric Power Losses in Power Networks" (DL / T686-1999) once required that the load at the head end of the distribution network should be allocated in proportion ...

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Problems solved by technology

But usually the size of the distribution load is not proportional to the rated capacity of the distribution transformer, so the theoretical power loss and theoretical line loss rate calculated by the "Guidelines for the Calculation of Power Network Power Loss" do not conform to the actual load distribution. When the power loss and statistical line loss rate are quite different from the theoretical power loss and theoretical line loss rate, it is impossible to judge whether the error of the statistical power loss and statistical line loss rate is large or the error of the theoretical power loss and theoretical line loss rate is large

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