105 results about "Evaluation Conclusion" patented technology

The invention relates to an on-line diagnosis and evaluation method of the insulation state of a large electric machine, aiming at accurately diagnosing and evaluating the insulation state by comprehensively considering the influences of working environmental factors, such as vibration, temperature, humidity, and the like, of the electric machine on partial discharge. The on-line diagnosis and evaluation method comprises the following steps of: firstly building a neural network used for identifying discharge modes; constructing a neural network frame in an MATLAB2007 (Matrix Laboratory 2007); extracting a sample from a sample library to train the neural network; respectively building relational models of various discharge modes and the working environmental factors influencing the discharge modes according to the action relationship of the working environmental factors on the different discharge modes; installing various sensors on the large electric machines, and acquiring data; establishing a database; calculating a characteristic value; correcting to obtain a Qm value at a standard working environment; longitudinally comparing corrected Qm historical data read from the database with the current corrected Qm value, and horizontally comparing Qm among three phases of same equipment and among all electric machines so as to obtain the insulation state according to corresponding rules. The invention provides a diagnosis and evaluation conclusion of an insulation fault.

The invention discloses a vertical lift safety evaluation method. An evaluation model is established based on a fuzzy mathematical modeling method and comprises a lift safety evaluation index system part, an index relative importance part and an index fuzzy evaluation standard part. The vertical lift safety evaluation method comprises the following steps of: establishing a hierarchical evaluation model of a safety evaluation index system of a general lift system; determining the index relative importance and determining the safety state fuzzy membership of the evaluation index; and calculating a comprehensive evaluation score F of the lift system so as to realize the lift safety evaluation according to the comprehensive evaluation score F and a corresponding safety level. The modeling evaluation method has the characteristics of successively splitting, refining and integrating, and an effective comprehensive evaluation conclusion can be formed according to the evaluation result of the evaluation index.

The invention relates to a wireless cellular communication technology, in particular to an operators coverage comparison method based on user measurement reports in different GSM (global system for mobile communications) mobile operator systems. The comparison method comprises the following steps: acquiring the user measurement reports, defining a field strength interval measurement threshold based on the measurement reports, and setting the range of frequency points for measurement; and after acquiring the data, processing the measurement reports based on the threshold setting of the covered measurement reports and a coverage model calculation method to obtain an evaluation conclusion of the network coverage level. By using the comparison method, the measurement reports on frequencies and levels of competitors can be collected so as to evaluate the coverage, so that the evaluation result is truer, the working efficiency is higher, and pertinent optimization can be made to the region having great disparity.

The invention belongs to the technical field of dam safety reconnaissance, and discloses a comprehensive evaluation method for the dam safety. The method comprises the following steps that 1, a hierarchical structure model of a dam safety system is constructed to generate a tree diagram which takes an objective layer and a criterion layer as a father-son relationship and takes the criterion layer and a factor layer as a father-son relationship; 2, weights of all factors are obtained on the basis of an analytic hierarchy process; 3, objective weight values of all the factors are obtained on the basis of an entropy weight method; 4, a comprehensive weight of indexes is calculated; 5, the evaluation conclusion membership degree is judged; 6, comprehensive evaluation is performed on the dam properties. According to the comprehensive evaluation method for the dam safety, expert knowledge, engineering experiences and measurement data can be utilized more fully, and the dam working properties can be analyzed and evaluated more comprehensively and thoroughly; in addition, an algorithm is clear, easy to achieve and good in robustness, and the method can serve as a more reliable decision aid mean in dam safety management.

The invention relates to a power cable state evaluation method based on momentum BP neural network, which comprises the following steps: momentum BP neural network with momentum factor is established;the neural network is trained by collecting multi-group data of power cable state index, the weight of the neural network is adjusted gradually by output value, target value, weight change and momentum factor of the neural network, so that the error between output value and target value is minimized globally, after the training, the power cable state index data to be evaluated is inputted to themomentum BP neural network, and the running state of the power cable is judged. Momentum BP neural network has fast convergence and minimal global error. The method can quickly and accurately establish the mapping relationship between power cable status index data and evaluation conclusion, evaluate power cable status comprehensively and accurately, and provide scientific basis for cable operationand condition-based maintenance.

The invention discloses an interactive multilevel decision method of a comprehensive evaluation in power quality based on a cloud model. By using the cloud model, fuzziness and randomness are integrated together to constitute a mapping between qualitative and quantitative factors, and as a basis of information expression, the feature tallies with fuzziness and randomness of power quality grades. Subjectivity and objectivity can be well unified by an improved interactive multilevel decision model. Through combination of subjectivity and objectivity, a new comprehensive evaluation method of power quality based on the cloud model and the interactive decision is formed to achieve a more accurate, more objective and more scientific evaluation conclusion.

The invention discloses a fuzzy comprehensive evaluation method for aging degree of a ZnO varistor. The method comprises collecting data of power loss change rate, space charge distribution change rate, grain boundary barrier height change rate and grain boundary capacitance change rate in aging process, classifying the collected data and establishing an initial data sample set; establishing an aging evaluation system, wherein the evaluation indexes include four characteristic parameters: power loss, space charge, grain boundary barrier and grain boundary capacitance; determining the comprehensive weights of each evaluation index by AHP; constructing the evaluation model to evaluate the aging degree and draw the evaluation conclusion. The fuzzy comprehensive evaluation method for aging degree of the ZnO varistor combines the macroscopic parameter power loss of ZnO varistor with the microscopic parameter space charge distribution, grain boundary barrier height and grain boundary capacitance, the aging state of ZnO varistor can be evaluated effectively, and the specific aging degree value can be given to show the aging degree intuitively.

The invention relates to a method for evaluating access of an electric vehicle charging and replacing facility to a power distribution network. The method comprises the following steps of: setting five types of evaluation indexes of technicality, economy, normalization, electric energy quality and system secondary; refining the set five types of evaluation indexes of technicality, economy, normalization, electric energy quality and system secondary; carrying out weight calculation evaluation on the obtained detailed indexes, wherein the indexes are evaluated by adopting a percentage system scoring mode; according to the index system and method, scoring each evaluation index of the power distribution network accessed to the charging and replacing facility one by one; calculating to obtain afinal evaluation score according to the obtained weight of each index; and repeating the above steps to obtain an evaluation value of the scheme of connecting each electric vehicle charging and replacing facility to the power distribution network, and indicating that the scheme is high in comprehensive level with a high evaluation value. An evaluation conclusion is divided into three levels of higher level, middle level and lower level. The method can be widely applied to the field of evaluation of power distribution network access of electric vehicle charging and replacing facilities.

The invention provides an intelligent electric energy meter supplier evaluation method which comprises the following steps: selecting a metering performance index and a business index which comprehensively reflect the error condition of an intelligent electric energy meter to form basic influence factors in an evaluation system; Quantifying the basic influence factors according to corresponding strategies according to actual conditions; an analytic hierarchy process is adopted, basic influence factors are converted into a comprehensive index capable of achieving intelligent electric meter supplier evaluation, and an evaluation conclusion is formed for the supply priority of the intelligent electric meter according to the comprehensive index. An existing evaluation method describes the metering performance of an electric energy meter too roughly, a unified reference is lacked when the index priority is measured and influenced, and a comprehensive and fine transverse comparison conclusion is difficult to form. Therefore, the metering performance of the electric energy meter is refined to four dimensions, the business competitiveness of the supplier is comprehensively considered, andby means of an analytic hierarchy process, a plurality of influence indexes are converted into comprehensive scores under a preset priority reference to form an evaluation conclusion of the prioritiesof different suppliers.

The invention discloses a method for optimizing and evaluating green space projects of a power grid enterprise. According to the invention, an evaluation model and an index system are formulated through summarizing basic requirements and general steps of optimizing and evaluating the power grid green space projects, index weights are set, and the development of evaluation software for the power grid green space projects is completed. The green space projects are divided according to the scale and the return and according to project factors and enterprise factors, thereby achieving a purpose ofoptimizing the green space projects scientifically and systematically. The method provides a basis for comparing and evaluating the quality of a kind of green space projects with the same attributes,statistical analysis is performed in allusion to evaluation conclusions and historical data of the green space projects, and scientific and reasonable suggestions are provided on the project implementing effect for decision-makers to refer to.