Active power distribution network power quality multi-dimensional evaluation method

Abstract

The invention discloses an active power distribution network power quality multi-dimensional evaluation method. The method comprises the steps of determining each index level of power quality based ona cloud model; calculating the weight of a subjective analytic hierarchy process and the weights of an objective entropy weight method and an anti-entropy weight method; calculating a weight coefficient of each weighting method based on a cooperative game theory, and determining the overall power quality grade of the active power distribution network; and constructing an electric energy quality index characteristic matrix, and calculating energy loss caused by corresponding indexes based on a test extrapolation method to obtain economic loss of the target active power distribution network caused by the electric energy quality problem. The method has the advantages that: 1, the index weight of the power quality is calculated by adopting a plurality of weight calculation methods, and the characteristics of each weight calculation method are considered, so that the advantages and disadvantages of the weight calculation methods can be complementary; 2, the weight combination mode based onthe cooperative game theory enables the weight combination to be more reasonable; 3, the test extrapolation method can evaluate the power quality economy more quickly and conveniently; and 4, a morecomprehensive and scientific power quality multi-dimensional evaluation method is provided for the active power distribution network.

Description

technical field [0001] The invention relates to multi-dimensional evaluation of the power quality of an active distribution network from the aspects of technology and economy, and belongs to the fields of electrical engineering and power quality. Background technique [0002] With the advancement of science and technology and the continuous development of the economy, electric energy has become a part of people's increasing concern, and the increase in demand for electric energy has also led to more and more distributed power supplies. As more and more distributed power sources are connected to the active distribution network, the power quality of the active distribution network changes, which gradually attracts the attention of the distribution network and users, highlighting the importance of multi-dimensional evaluation of power quality. [0003] At present, the comprehensive evaluation of power quality in the active distribution network mainly focuses on the weighting of...

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Problems solved by technology

The invention patent with the application number of 201811258364 proposes a comprehensive evaluation method of power quality that considers the influence weight of indicators. It uses D-S evidence theory to determine the matrix elements of the improved Analytic Hierarchy Process (AHP) to determine the weight value. Starting with the weight method to evaluate power quality, the accuracy of the obtained weights is difficult to guarantee; the invention patent with the application number 201811632904 proposes a method based on the AHP method and the improved entropy weight method to determine the subjective weight and objective weight of the power quality index, but it only A combination of subjective weighting method and objective weighting method does not fully consider its rationality; the invention patent with application number 201810716329 proposes a comprehensive evaluation method of power quality based on probabilistic neural network, which does not need to determine indicators during the evaluation process Weight, which avoids human subjective factors, but its comprehensive evaluation is more biased towards objective factors; the patent application number 201610652596 proposes a public information model construction method for the economic evaluation of power quality, and selects appropriate data for construction through data analysis Economic evaluation model, but it cannot quickly evaluate the losses caused by power quality problems

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