The invention relates to an index weight acquiring method and system. The method comprises the following steps: respectively acquiring the simultaneous independent data, the time difference independent data and the prediction independent data of the target index data on the basis of each target index data; acquiring the weight parameter of the target index data according to the simultaneous independent data, the time difference independent data and the prediction independent data, normalizing the weight parameter of each target index data to obtain the weight of each target index data. The combination of three different data is used as the standard for balancing the relevance among the target indexes, the repeated information represented by three different data is incompletely same, namely, the information repetition degree among the target indexes is small, so that the variable coefficient of the weight of the target index is large, the different significance among the target indexes can be reflected, and the prediction ability of the target index can be highlighted, and the prediction effect of macro economy prosperity is improved.

Index weight acquiring method and system

The invention provides a regional power network dispatching operation index evaluation method based on an information entropy theory, belonging to the technical field of power system dispatching evaluation. First, the power system operation indexes are selected and classified into rigidity index and flexibility index, and the corresponding threshold is set for each rigidity index. Type uniformization and dimensionless processing are carried out on each power network operation index; the comprehensive evaluation method of an entropy weight method is used to establish the evaluation matrix. If the rigidity index of any evaluated province exceeds the limit, the weight coefficient is adjusted. Then, after the weight coefficient is adjusted twice, the comprehensive index of dispatching operation level is calculated. The invention can provide an accurate quantification basis for comprehensive level evaluation of power network operation, and is helpful for power network administrators to grasp the operation situation of the power network and provide a reference basis for power network optimization.

A regional power network dispatching operation index evaluation method based on an information entropy theory

The invention discloses a voltage over-limit predication model based on main component analysis and a multivariable regression algorithm. Firstly a main component analysis method is applied for determining main influencing factors for voltage over-limit prediction. Furthermore the multivariable regression algorithm is used for establishing a voltage over-limit prediction model. A more scientific and more accurate power distribution network voltage over-limit prediction condition can be obtained, thereby facilitating comprehensive investigation for the operation conditions of the power distribution networks in different regions, facilitating finding of an area with an over-limit risk of the voltage, treating the early-warning problem as early as possible and improving power grid operation efficiency.

Voltage over-limit predication model based on main component analysis and multivariable regression algorithm

The invention relates to an urban power grid operation index screening method and system The method includes the following steps that: indexes of the same type in original indexes are grouped to one group according to index types; core value indexes in the grouped original indexes are selected; factor analysis is performed on the grouped original indexes, and common factors capable of interpreting all the indexes are found out; indexes with largest load are selected from the common factors so as to be adopted as initially selected KPI indexes; and the core value indexes are compared with the initially selected KPI indexes, and a final KPI index set is determined According to the method, complex calculation processes are not required in a screening process; index screening is carried out based on comprehensive consideration on the core indexes and the KPI indexes which are selected based on the common factors, namely, the index screening is carried out based on comprehensive consideration on the subjective aspect and the objective aspect; and therefore, selected indexes are approved in both of the subjective aspect and the objective aspect, can satisfy the operation and management requirements of an urban power grid and can accurately characterize the operation condition of the urban power grid

Urban power grid operation index screening method and system

The application discloses a distributed energy system stability assessment method and device The method comprises the following steps: obtaining recorded data, in a distributed energy system, of electric energy of a target function module related to stability of the distributed energy system; determining probability distribution of the electric energy in the target function module according to the obtained recorded data; and determining, according to the probability distribution, an energy entropy value of the target function module to evaluate the stability of the distributed energy system according to the energy entropy value Through adoption of the method, even if power generation and storage methods in the distributed energy system are diverse, complexity of the system itself is high, load power is uncertain, and other conditions exist, the corresponding energy entropy value can be finally calculated through the recorded data of the electric energy, the stability of the distributed energy system is evaluated then, and a foundation for improvement of the distributed energy system is laid, so the problems in the prior art are solved

Distributed energy system stability assessment method and device

The invention provides a method for calculating composite index of grid operation based on information source entropy. According to the method, historical data of all indexes are subjected to statistics, the change law of the indexes is analyzed, the orderliness and the degree of stability of the historical data of the indexes are reflected by the information source entropy of the indexes, and then, the weight coefficients of the indexes are obtained. The method for calculating the composite index of the grid operation, provided by the invention, is different from the traditional index weight calculation methods which are based on subjective rating, each index entry serves as an independent information source, and the information source entropy of concerned indexes is calculated and serves as a weight calculation basis of the indexes, so that the fluctuation amplitude and the disorderliness of index values can be reflected objectively, and the contribution rate and the distinction degree of the indexes to the composite index of the grid operation are calculated scientifically. The method is simple in flow, small in calculation amount, low in developing difficulty and distinct in physical meaning and has strong practicability.

Method for calculating composite index of grid operation based on information source entropy

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Method for calculating composite index of grid operation based on information source entropy