Dyn11 low-voltage power distribution network theoretical line loss calculation method and system

Abstract

The invention discloses a Dyn11 low-voltage power distribution network theoretical line loss calculation method. The method comprises the following steps: carrying out data acquisition and preprocessing on transformer area outlet voltage and current by utilizing a transformer area outlet voltage and current acquisition device; according to the method, the power supply wiring mode of the low-voltage power distribution network and the connection group of the power distribution transformer are judged according to acquired electrical data, and the conditions that the power supply mode is a three-phase four-wire system and the connection group of the power distribution transformer is Dyn11 are met; the equivalent resistance of the theoretical line loss of each acquisition point is calculated toobtain the theoretical line loss value of each acquisition point; and the theoretical line loss rate is calculated according to the statistical period. Compared with a conventional equivalent resistance method calculation method, the equivalent resistance calculation formula of the method does not need to consider the topological relation, the line parameters and the distribution transformer parameters of the low-voltage distribution line, and has high practicability. The invention also provides a formula for judging the power supply mode and the connection group by using the three-phase outlet current and three-phase outlet voltage acquisition data of the low-voltage power distribution network, and the formula has the characteristics of novelty and convenience.

Description

technical field [0001] The invention relates to a theoretical line loss calculation method and system of a Dyn11 low-voltage distribution network, belonging to the technical field of power distribution and utilization. Background technique [0002] The statistical line loss of low-voltage distribution network is due to the factors of line loss management, and it is impossible to accurately grasp the real line loss situation determined by its own equipment parameters and operating parameters. The operation level of network economy provides a basis for formulating reasonable loss reduction measures, and then realizes the precise development of low-voltage distribution network construction and transformation, and meets the country's long-term development strategy of energy conservation and emission reduction. [0003] The premise of accurate calculation of low-voltage distribution network theoretical line loss calculation methods such as conventional voltage loss method, bamboo...

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Problems solved by technology

[0003] The premise of accurate calculation of low-voltage distribution network theoretical line loss calculation methods such as conventional voltage loss method, bamboo joint method, equivalent resistance method and platform loss rate method is to obtain effective equipment parameters and operating parameters, but the actual low-voltage distribution network The low frequency of household electrical data collection, poor data quality, and the complex wiring of the low-voltage distribution network lead to the inaccuracy of the existing theoretical line loss calculation method of the low-voltage distribution network.

[0004] The existing technology cannot effectively and quickly calculate the theoretical line loss of the Dyn11 low-voltage distribution network under the condition that the equipment parameters, operation data and topology relationship of the low-voltage distribution network cannot be accurately and comprehensively obtained

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