A quantitative analysis method for the influence of power quality on the comprehensive energy consumption of transformers

Abstract

The invention relates to the field of energy consumption monitoring and energy-saving evaluation of electrical equipment and particularly relates to a quantitative analysis method for influences on comprehensive energy consumption by electric energy quality. The quantitative analysis method mainly comprises the following steps: (1) measuring low-voltage end harmonic data parameters of a transformer; (2) measuring voltage deviation and apparent power parameters of a low-voltage side of the transformer based on an L-shaped equivalent circuit of the transformer, and combining nominal parameters of the transformer to calculate equivalent resistance in the equivalent circuit of the transformer; (3) measuring three-phase load current parameters of the transformer; and (4) giving different weights and calculating the comprehensive energy consumption of the transformer respectively aiming at a transformer energy consumption change condition caused by calculated harmonic waves, voltage deviation and three-phase unbalanced factors. The quantitative analysis method can be used for rapid and accurate quantitative transformer electric energy quality energy consumption condition in engineering application, and provides effective data support for analyzing energy consumption characteristics of the transformer.

Description

technical field [0001] The invention relates to the fields of energy consumption monitoring and energy-saving evaluation of electric equipment, in particular to a quantitative analysis method for the influence of power quality on comprehensive energy consumption of transformers. Background technique [0002] Energy saving and loss reduction is one of the development directions of the smart grid. Transformers, as important transmission and distribution equipment in the power system, are indispensable electrical equipment in the power system to connect networks with different voltage levels. They exist widely in all levels of networks, and their working efficiency It is directly related to the efficiency of grid power conversion, and is also an important part of whether users can use power normally. Generally speaking, from power generation to power consumption, three to four transformation processes are required. Therefore, not only the total number of transformers exceeds t...

AI Technical Summary

Problems solved by technology

Long-term research and analysis of power quality shows that different power quality phenomena will more or less bring additional energy consumption to electrical equipment (including transformers), for example, when harmonic current flows into the transformer, it increases the copper loss and iron loss of the transformer , as the harmonic frequency increases, the skin effect becomes more serious, and the iron loss is also greater; the high voltage will lead to an increase in the hysteresis loss and eddy current loss of the transformer core; when the three-phase load is unbalanced, it will cause transformer loss and line loss. The increase in loss will also reduce the utilization of the transformer

However, since power quality and energy saving are two relatively independent fields, the research on the application of power quality data at home and abroad, especially the research on equipment energy consumption caused by poor power quality, is still in its infancy, staying at the qualitative analysis level, and there is no Develop intuitive and accurate quantitative analysis methods and models; especially the research on quantitative analysis methods of multiple power quality indicators for equipment energy consumption is still in the blank

Therefore, in actual work, it is impossible to quantitatively calculate the impact of power quality on the comprehensive energy consumption of transformers, and it is impossible to evaluate the direct economic benefits of power quality control, which affects the development of power grid equipment energy saving work.

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