Segmented double-track system comprehensive assessment and hierarchical description method for quality of electric energy

Abstract

The invention discloses a segmented double-track system comprehensive assessment and hierarchical description method for the quality of electric energy, and belongs to the technical field of the quality of electric energy. The method comprises the following steps of: single index pretreatment, single index grade dividing, and the segmented double-track comprehensive assessment and hierarchical description. The invention also discloses a segmented double-track system comprehensive assessment and hierarchical visual display method for the quality of electric energy, and the hierarchical visual display method for the quality of electric energy is a cloud picture display method or a node display method. The invention comprises a segmented double-track system comprehensive assessment method for the quality of electric energy, which has a better engineering guiding significance. The segmented double-track system comprehensive assessment method for the quality of electric energy is provided with a hierarchical description method with the specific physical meaning and a visual display method with abundant and practical information, and can be applied to various aspects, such as regional large power grid electric energy monitoring and controlling systems, electricity market electric energy pricing mechanisms and electric energy trading platform construction.

Description

technical field [0001] The invention discloses a segmented dual-track system comprehensive evaluation and classification description method of power quality, which belongs to the technical field of power quality. Background technique [0002] The problem of power quality has attracted people's attention, mainly because poor power quality may affect the accuracy of power metering and cause economic disputes in the power market; Necessary economic loss; it may lead to equipment shutdown or damage, resulting in a decrease in productivity and an increase in production costs; it may also lead to electromagnetic compatibility problems and noise pollution problems. Therefore, comprehensive evaluation of power quality is of great significance in modern power systems. [0003] However, the power system itself is a very complex random system, and the time, location, scope, and nature of the faults are highly uncertain, which makes the change of power quality an uncertain process, whi...

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Problems solved by technology

[0003] However, the power system itself is a very complex random system, and the time, location, scope, and nature of the faults are highly uncertain, which makes the change of power quality an uncertain process, which gives power quality Qualitative analysis and quantitative analysis bring great difficulty

Moreover, various power quality problems in a power grid often exist at the same time, and they are not single. Different power quality problems have different effects on different equipment, especially when multiple power quality problems exist at the same time, the impact of different combinations on equipment will be is a very complex issue

[0004] Although many countries and organizations have formulated national or international standards for individual indicators of power quality in recent years, these standards can only judge whether a certain indicator of power quality is qualified, and some experts have proposed some comprehensive evaluation methods, such as based on Evaluation methods of fuzzy mathematics, evaluation methods based on probability and statistical characteristics, genetic projection pursuit methods based on machine learning, artificial neural network methods, and matter-element analysis methods, analytic hierarchy process, expert scoring methods, etc., but often pure mathematics It is difficult to give convincing physical meaning to the comprehensive digital level, and it lacks engineering guiding significance

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