User sag economic loss assessment method based on multi-quality loss function synthesis

Abstract

The invention discloses a user sag economic loss assessment method based on multi-quality loss function synthesis. The method comprises the steps of counting user sensitive equipment compositions in apower system, and calculating a synthetic voltage tolerance curve of any node; calculating an equipment failure rate, an energy index and voltage sag severity of the node under each voltage sag eventaccording to historical data, and calculating quality losses caused by the equipment failure rate, the energy index and the voltage sag severity ; according to calculation results, weighting the quality losses of four parts including the equipment fault rate, a voltage sag amplitude, the energy index and the voltage sag severity based on an entropy weight method; performing parameter estimation of a quality loss function according to the economic loss generated by voltage sag in a historical record; and performing voltage sag economic loss assessment of a user according to the sag amplitude and duration of current voltage sag to obtain the economic loss of the current voltage sag. The method has the advantages that the objectivity is higher and an assessment result is more accurate.

Description

technical field [0001] The invention relates to the technical field of voltage sag economic evaluation, in particular to a user sag economic loss evaluation method based on multi-quality loss function synthesis. Background technique [0002] In recent years, as various sensitive loads are put into the power grid, the impact of voltage sags on users has become more serious. In order to reasonably configure mitigation equipment and determine the optimal investment plan, it is necessary to reasonably evaluate the economic losses caused by voltage sags to users. [0003] Voltage sag will endanger the operation safety of sensitive loads, and the economic losses are also increasing due to the wide application of new sensitive equipment. The impact of voltage sags in different areas is not only closely related to the quality of power supply of the power supply department on the grid side, but also related to the differences in user-side equipment and production processes. When ma...

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Problems solved by technology

[0004] At present, there are few studies involving the evaluation of economic losses of user voltage sags, literature 1 (CHEN Wenbo, DING Chaojie, Li WANG1, et al. Economic analysis of voltage sag loss and treatment based on On-Site data[C]. 2016 China International Conference on .Beijing: Electricity Distribution (CICED), 2016: 10-13.) proposed a method of calculating voltage drop loss by questionnaire survey and face-to-face interview, but the workload is large and the feasibility in practice is low

Document 2 (Zhang Xuemeng, Li Guodong, Xu Yonghai, et al. Estimate-based technical and economic evaluation of voltage sags [J]. Power Grid Technology, 2010, 34(10): 121-125.) Considering the sensitivity of user equipment Uncertainty and different types and compositions of equipment, the economic evaluation is carried out by calculating the equipment failure rate of users for sags, but the equipment failure rate curve is used to reflect the changing trend of economic losses, and as the types of losses considered increase , the accuracy will be worse

Document 3 (Li Chunhai, Li Huaqiang, Liu Bojiang. Risk assessment of industrial users' voltage sag economic loss based on process immunity uncertainty [J]. Electric Power Automation Equipment, 2016, 36(12): 136-142.) Considering process immunity time And its uncertainty, set different thresholds for different sub-processes of industrial processes, and evaluate the classification of economic losses caused by sags, which improves the evaluation accuracy, but it is not applicable to users who cannot use tree structures to represent the active process

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