RAGA-PPE Model for Power Quality Comprehensive Evaluation

2015 ◽  
Vol 8 (1) ◽  
pp. 211-217
Author(s):  
Yunjun Yu ◽  
Yuntao Xue ◽  
Chao Tong ◽  
Sui Peng ◽  
Jianbo Xin ◽  
...  
Keyword(s):  
Power Quality ◽  
Comprehensive Evaluation ◽  
Power Index ◽  
Evaluation Model ◽  
Target Function ◽  
Assessment Model ◽  
Three Dimensions ◽  
Multidimensional Data ◽  
Projection Direction ◽  
Optimal Projection

This paper proposes RAGA-PPE comprehensive assessment model specifically for high-dimensional index system issue in order to conduct comprehensive evaluation of the power quality of multi-index regional power grid from three dimensions of index, time and region through adjustment of time factor size. The model adopts PPE to convert power index of multidimensional data to lower-dimensional subspace and compress multiple power indexes to single power index for systematic comprehensive evaluation, which overcomes shortcomings such as influences of human and subjective factors and local optimization in conventional assessment methods. Improved RAGA based on real coding is used for optimization of target function to reduce optimization workload and search out the optimal projection direction rapidly. The optimal projection direction subject to optimization reflects the degree of importance of various power indexes for comprehensive evaluation of power quality. Examples prove that the evaluation model is simple in computation, good in applicability, and accurate and objective in evaluation result, providing a new method and thought for decision of comprehensive evaluation for power quality.

Study of the Quantitative Assessment of Rational Buoys Layout

2014 ◽  
Vol 1065-1069 ◽  
pp. 531-535
Author(s):  
Tian Chai
Keyword(s):  
Quantitative Assessment ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Model ◽  
Assessment Index ◽  
Main Factors

In order to evaluate rational buoys layout of the route quantitatively, the method of fuzzy comprehensive evaluation is applied to establish a rational buoys layout evaluation model. According to the 9 main factors that affect rational buoys layout, a quantitative assessment model is established. The AHP is used to determine weighted coefficients of assessment index. In the paper, the assessment for the buoys layout of three routes is carried out.

The Application of Fuzzy Comprehensive Evaluation in Risk Assessment of Incremental Launching Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2028-2033 ◽  
Author(s):  
Zhong Chu Tian ◽  
Lei Yang ◽  
Tian Yong Jiang
Keyword(s):  
Risk Assessment ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Model ◽  
Analytic Hierarchy ◽  
Assessment Index ◽  
Comprehensive Evaluation Model ◽  
Assessment Index System ◽  
Hierarchy Process

The risk factors of continuous incremental launching bridge during construction stage are specialized. The risk in incremental launching stage is analyzed and identified. A risk assessment index system is built. A fuzzy comprehensive evaluation model is developed. The results obtained from the risk assessment model verifies the validity and practicality of the developed method by the combination of analytic hierarchy process and fuzzy mathematics theory. Moderate risk assessment results are developed to provide references for incremental launching construction method.

Comprehensive Evaluation of Drill Wear Based on the Model of Projection Pursuit

2014 ◽  
Vol 602-605 ◽  
pp. 272-276
Author(s):  
Li Li Zhao ◽  
Yu Cai Dong ◽  
Lu Liu ◽  
Guan Yu Kou ◽  
Min Lin ◽  
...  
Keyword(s):  
Optimization Problems ◽  
Comprehensive Evaluation ◽  
Projection Pursuit ◽  
Weight Coefficient ◽  
Good Effect ◽  
Projection Data ◽  
Projection Direction ◽  
Optimal Projection ◽  
Projection Pursuit Model ◽  
Wear Evaluation

To overcome the deviation caused by the effect of subjective factors in drill wear evaluation, and make the evaluation more accurate and objective, on the basis of drill wear comprehensive evaluation criterion, the projection data are built with projection pursuit method. Two hundred drill wear comprehensive evaluation samples are randomly generated within the range of each class. The projection pursuit model is built by unitary processing according to these samples, which converts the evaluation into non-linear multi-constrained optimization problems. The optimal projection direction vector and the weight coefficient of each evaluation index are obtained with composite simplex method. Meanwhile the corresponding relationship between the region of variation of projection eigenvalue and classification grade is established. The precision of sample evaluation reaches 100% and the evaluation of the measured data achieves good effect. Thus, the scientific evaluation of drill wear is realized by the projection pursuit model.

Safety Assessment Model for Expressway Based on Accident Mechanism

2014 ◽  
Vol 1030-1032 ◽  
pp. 2110-2114
Author(s):  
Li Li Lu ◽  
Gang Ren ◽  
Li Ming Lu
Keyword(s):  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Safety Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Model ◽  
Analytic Hierarchy ◽  
Safety Level ◽  
Factors Affecting ◽  
Accident Mechanism ◽  
Hierarchy Process

It is of great significance to enhance freeway safety. This paper analyzed the factors affecting freeway safety systematically. Analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE) were applied to develop a freeway safety evaluation model. This model has a practical application on evaluate freeway safety level.

The Power Quality Evaluation Method Based on the Matter-Element Comprehensive Evaluation Method

2014 ◽  
Vol 1030-1032 ◽  
pp. 1403-1406 ◽  
Author(s):  
Gang Zhang ◽  
Fu Chao Liu ◽  
Tuo Xie ◽  
Jing Jing Zheng
Keyword(s):  
Electric Power ◽  
Power Quality ◽  
Power Supply ◽  
Evaluation System ◽  
Quality Evaluation ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Electrical Energy ◽  
Element Model

As for the pricing by electrical energy quality and the decision of rewards and penalties based on the examination at assessment point, Comprehensive evaluation on power quality is one of the principal foundations. To analysis and evaluate electric power quality for electric power company is a focus research at present. In this paper, the power quality evaluation model based on the matter-element extension theory is applied to power quality evaluation service. For power quality evaluation system of the characteristics of the complexity and incompatibility between various indicators hierarchies, this paper applied the theory of matter-element extension constructing Matter-element model, and identified level of power quality of power supply company through the calculation of weight and the correlation service. Taking GanSu Grid Company as an example to evaluate power supply quality, the results show that the evaluation results of power quality evaluation method based on the matter-element evaluation method are more objective, more precise and more reasonable.

Grid Enterprise Operational Risk Identification and Assessment Model

2014 ◽  
Vol 521 ◽  
pp. 786-792
Author(s):  
Shu Xiang Wang ◽  
Wei Dong Zheng ◽  
Chuang Deng ◽  
Hou Dong Xu ◽  
Sheng Wei Wang ◽  
...  
Keyword(s):  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Power Grid ◽  
Operational Risk ◽  
Fuzzy Comprehensive Evaluation ◽  
Risk Identification ◽  
Assessment Model ◽  
Comprehensive Evaluation Model ◽  
Fishbone Diagram ◽  
Easy Operation

Based on the Balanced Scored Card theory, this research built a fishbone diagram model of power grid enterprises operational risk identification, and established an index system of operational risk by an index of grid enterprises operational risk ISM selection model. Proposing a multi-level fuzzy comprehensive evaluation model of grid enterprises operational risk which based on AHP method and transforming evaluation results into the scores to do quantitative analysis for evaluation results. There is an empirical analysis on provincial power Grid Company with the simple model and easy operation, and the evaluation results can serve as a basis decision-making for risk-averse.

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