15 results about "Nodal analysis" patented technology

The invention relates to the technical field of fault detection, in particular to a power distribution network system fault monitoring method and system based on multi-source information, and the method comprises the following steps: based on the operation state data of a power distribution network, extracting voltage, current and equipment states, recognizing and standardizing abnormal events, extracting timestamp recognition wave bands and propagation paths, and carrying out the statistics of type evaluation weights. According to the method, logical and sequential analysis is carried out on the multi-source operation data of the power distribution network, association recognition and hierarchical collection of abnormal events are achieved, abnormal association judgment and propagation rule recognition are enhanced, and the fault propagation and collection efficiency is improved. The fault data analysis and presentation mode is optimized, the fault traceability and path tracking accuracy is improved, abnormal wave bands are dynamically divided, priorities are sequenced, misjudgment and omission are reduced, accurate recognition of key nodes and influence ranges is ensured, and the power grid abnormity monitoring and risk early warning capacity is enhanced.

The invention discloses a power plant node impedance matrix collaborative correction method based on distributed parallel computing, relates to the technical field of power plant node correction, and aims to solve the problem of poor correction effect caused by inaccurate node analysis in a power plant. Regions are divided in a hierarchical clustering mode based on topological relevance and other characteristics, dynamic optimization is carried out in combination with load balancing and other constraints, node resource accurate allocation tasks are matched, regional topological integrity is guaranteed, calculation loads are balanced, resource waste is reduced, key parameters are synchronized in time through a standardized boundary information exchange mechanism, and the reliability of the system is improved. Coupling errors caused by region segmentation are eliminated, local autonomy and boundary collaboration are achieved, local calculation pertinence is reserved, consistency of electrical characteristics among regions is ensured, global deviation is corrected by combining layered optimization, it is ensured that a matrix conforms to an electrical law, multi-reference verification and four-dimensional index evaluation are conducted, and it is ensured that results are accurate, stable and practical.

Provided in the embodiments of the present invention are a test process analysis method and apparatus, an electronic device and a storage medium. The method comprises: acquiring service information of input nodes connected to a plurality of input connection lines connected to a multi-input-multi-output node, service information of output nodes connected to a plurality of output connection lines connected to the multi-input-multi-output node, and service information of the multi-input-multi-output node; on the basis of the connection relationship between the nodes, determining the analysis sequences for the nodes, the analysis sequence of the input nodes being prior to the analysis sequences of the multi-input-multi-output node and the output nodes; and, according to the determined node analysis sequences, configuring the service information of the nodes to the corresponding nodes so as to analyze the test process into a plurality of ordered operations.

The present disclosure relates to a computer-implemented method (20) for simulating a power supply circuit (10), where the method comprises: (S20) determining a modified nodal analysis (MNA) model of the power supply circuit; (S21) converting the MNA model into a Laplacian model, wherein the Laplacian model describes the relationship between the circuit waveform and the power supply waveform through a Laplacian function matrix; (S22) determining the characteristic frequency of the power supply circuit based on the matrix of the Laplacian model; (S23) determining a transfer function from one circuit waveform to each of the other circuit waveforms based on the matrix of the Laplacian model; (S24) determining a weighting coefficient of a characteristic function of the characteristic frequency based on an initial state of a passive energy component of the power supply circuit and based on the transfer function; and (S25) predicting a circuit waveform of the power supply circuit based on the characteristic frequency, the transfer function and the weighting coefficient.

The invention belongs to the technical field of oil reservoir exploitation, particularly relates to a medium-high permeability heterogeneous oil reservoir depressurization exploitation lower limit pressure calculation method and system, electronic equipment and a storage medium, and aims to solve the problem that a method for rapidly and scientifically evaluating the oil reservoir depressurization exploitation lower limit pressure does not exist at present. The method comprises the steps of obtaining basic dynamic and static data of an oil reservoir; calculating the wellbore liquid column height of the oil reservoir based on the basic dynamic and static data, and calculating the water head pressure of the oil reservoir based on the wellbore liquid column height of the oil reservoir; based on the basic dynamic and static data, the average single well critical liquid production capacity meeting the oil reservoir pressure reduction requirement is calculated, and based on the average single well critical liquid production capacity, the average single well production pressure difference meeting the oil reservoir pressure reduction requirement is calculated; and calculating the pressure reduction lower limit of the oil reservoir based on the average single well production pressure difference meeting the oil reservoir pressure reduction and the water head pressure. The method for calculating the oil reservoir pressure reduction lower limit pressure suitable for different lifting processes is obtained by applying a shaft pressure node analysis principle.

A least-cost path selection system includes a computing device. Each of a plurality of travel paths connects any two nodes among a plurality of nodes. The least-cost path is a travel path having the smallest objective function value among the plurality of travel paths. The computing device selects the least-cost path among the plurality of travel paths. A link path is defined as a path connecting any two adjacent nodes among the plurality of nodes. A loop path is defined as a closed path connecting at least three nodes among the plurality of nodes. A loop variable is a variable corresponding to the loop path and having a value and a direction. A link variable is a variable whose direction is determined by loop variables adjacent to the link path. A link cost is a constant corresponding to the link path. The computing device modifies at least one of the plurality of loop variables based on at least one of Loop-wise Route Representation (LRR) and a circuit analysis method to calculate a plurality of reference link variables, each being a link variable with a determined direction. The circuit analysis method includes at least one of Mesh Current Method (MCM), Nodal Analysis, and Numerical Method. The computing device modifies the values of the plurality of loop variables within the range where the directions of the plurality of reference link variables remain unchanged. The computing device selects the least-cost path using a linear objective function.

A method for determining a performance of a well with an electrical submersible pump (ESP) therein includes receiving input data related to the well. The method also includes generating an ESP curve based upon the input data. The method also includes generating a nodal analysis plot based upon the input data. The method also includes determining a mechanical status of the well based upon the input data. The method also includes determining the performance of the well based upon the ESP curve, the nodal analysis plot, and the mechanical status of the well.

A method for determining a performance of a well with an electrical submersible pump (ESP) therein includes receiving input data related to the well. The method also includes generating an ESP curve based upon the input data. The method also includes generating a nodal analysis plot based upon the input data. The method also includes determining a mechanical status of the well based upon the input data. The method also includes determining the performance of the well based upon the ESP curve, the nodal analysis plot, and the mechanical status of the well.

This invention discloses an optimized method for gas lift-assisted drainage in high-water-yield horizontal wells, belonging to the field of oil and gas field development technology. It aims to address the problems of unclear pressure distribution in the tubing and annulus wellbore of high-water-yield gas wells, limited optimization of gas lift and annulus drainage synergy, and a lack of systematic optimization of the production regime for the drainage channel. The method first collects wellbore structure and production data of the target gas well, introduces dimensionless numbers in the form of Froude numbers to characterize the operating conditions of high-pressure gas wells, and establishes tubing and annulus wellbore pressure drop models for high-water-yield gas wells based on experimental test data. It then introduces nodal analysis to compare tubing and annulus production methods, selects the production channel that can effectively reduce bottom hole flowing pressure, and determines the reasonable gas injection rate based on the TPR curve characteristics under tubing or annulus production conditions. This method requires no tubing string replacement, is simple to operate, provides accurate pressure calculations, and has strong adaptability, providing theoretical and technical support for the optimization of high-water-yield gas well processes.

The invention relates to the technical field of energy management, in particular to a mobile power supply energy consumption prediction and optimization system, which comprises a power offset monitoring module, an abnormal power failure judgment module, a residual energy calibration module, an energy consumption reference setting module and a dynamic energy distribution module. And analyzing the collected continuous power change data in each time period. According to the invention, through dynamic monitoring and grading analysis of power fluctuation of the Internet of Things intelligent mobile power supply, fine identification and response of power utilization abnormity are realized, power failure risk nodes can be tracked and filed in time, through trend linkage of residual current and voltage, dynamic correction of residual energy is realized, and the power utilization efficiency is improved. According to the method, multi-dimensional task parameters and environmental conditions are combined for comprehensive modeling, an accurate judgment base line of periodic energy consumption is formed, real-time optimization matching is achieved for energy distribution of the terminal, the system is promoted to have the self-adaptive adjustment capacity, and continuous energy supply and terminal cooperative operation under multiple scenes are effectively supported.

The invention relates to the technical field of strong electromagnetic pulse protection and simulation, and particularly discloses a strong electromagnetic pulse transient simulation method and related device based on an improved DEPACT macro model, and the method comprises the steps: calculating an initial electric field and an initial magnetic field for a lossless transmission line part of an equivalent unit of the DEPACT macro model; determining lossy earth correction of the horizontal electric field according to the initial magnetic field and the impedance parameter of the overhead line; correcting the initial electric field by using the correction amount to obtain a corrected excitation electric field; and taking the corrected excitation electric field as input, performing transient simulation based on a DEPACT macro model, and calculating the transient response of the overhead line through a nodal analysis method. According to the method, under the condition that a basic framework of a DEPACT macro model is not changed, the lossy earth correction amount is introduced to correct the external excitation electric field, the earth loss effect can be reflected more accurately, calculation of the induced voltage and the induced current of the overhead line is achieved in combination with a node analysis method, and the method can be suitable for transient characteristic analysis of a long line under the action of strong electromagnetic pulses.

The present disclosure provides a computer-implemented method for simulating a power circuit, comprising: - determining a Modified Nodal Analysis (MNA) model of the power circuit; - converting the MNA model into a Laplace model that describes the relationship between a circuit waveform and a power supply waveform by a matrix of Laplace functions; - determining a characteristic frequency of the power circuit based on a matrix of a Laplace model; - determining a transfer function from one circuit waveform to each of the other circuit waveforms based on the matrix of the Laplace model; - determining weighting coefficients of the characteristic function of the characteristic frequency based on the initial state of the passive energy components of the power circuit and based on the transfer function; - predicting a circuit waveform of a power circuit based on the characteristic frequency, the transfer function and the weighting coefficient; The present invention relates to a computer-implemented method including:

The present application relates to the technical field of new energy power system dispatching, and particularly relates to a method, system, device and medium for offshore wind power analysis considering prediction information, the method comprising: constructing a key node set of offshore wind power group, adjusting active power output of each power source involved in power flow calculation, inputting a virtual phase modifier at the key node, obtaining real-time / predicted node voltage-virtual phase modifier reactive power output curve of each key node, and determining the reactive power margin of the weakest node; constructing a key node set of offshore wind power grid strength, generating an interimpedance matrix online based on a preset strength standard, analyzing new energy multi-station short-circuit ratio of the offshore wind power group, and evaluating the grid strength; sorting and analyzing the voltage static stability margin of the key node of the offshore wind power group, sorting and analyzing the grid strength of the key node of the offshore wind power grid strength, determining the weakest node, analyzing the change trend, and comprehensively evaluating the operation risk based on the early warning threshold, and early warning the risk node.

The application relates to a double-fed wind farm grid-connection eigenvalue analysis method considering unbalanced grid voltage, and dynamic mathematical models of each element of a system are established; a system balance point is obtained based on a frequency shift method; the dynamic mathematical models of each element of the system are linearized to obtain corresponding linearized continuous state space models; each element continuous state space model is discretized based on a trapezoidal integration rule, according to the connection characteristics of each element in the system and the continuous state space model characteristics of each element, the system elements are divided into single-port elements and double-port elements, and the discrete state space models of different port elements with a unified description form and discrete equivalent circuits thereof are obtained; a full-system discrete state space model is constructed based on a node analysis method, and a system discrete state matrix is obtained. The double-frequency component introduced when a balance point is obtained by adopting a Park transformation is avoided; the discrete state space model of the double-fed wind turbine grid-connection system is established, and the selection process of system state variables is simplified.

The invention discloses a PEEC-based hybrid line lightning stroke overvoltage prediction method, and belongs to the technical field of electromagnetic transient analysis of a power system, and the method comprises the steps: obtaining the structure and material parameters of a GIL-overhead line hybrid power transmission line; discretizing conductors of different structures based on a partial element equivalent circuit theory; calculating partial resistance, inductance and capacitance parameters of each cell; establishing a frequency domain system equation by using a modified node analysis method based on the parameters; obtaining a lightning current time domain waveform and constructing a frequency domain excitation source; after solving the frequency domain, converting the frequency domain response into a time domain waveform by adopting numerical inverse Laplace transformation; and calculating a voltage refraction coefficient based on the line characteristic impedance so as to evaluate the overvoltage risk at the joint. According to the method, the problem that a traditional transmission line model is insufficient in simulation precision at the wave impedance abrupt change position is solved, accurate prediction of the lightning overvoltage of the mixed line is achieved, and a reliable basis is provided for insulation cooperation and lightning protection design.