26 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.

The embodiment of the invention relates to the technical field of packaging interconnection reliability analysis, and provides a construction method and device for an electro-thermal migration effect circuit model of an interconnection line, and the method comprises the steps: converting an electro-thermal migration effect into a circuit parameter change based on a Korhonen control equation and boundary conditions, capturing the significant influence of temperature and temperature gradient on atom migration, and carrying out the analysis of the reliability of the interconnection line. According to the method, an equivalent circuit model of the interconnection line under the electro-thermal migration effect is deduced, a circuit matrix equation corresponding to the equivalent circuit model is determined by using an improved node analysis method, dimension reduction processing is performed on the circuit matrix equation, and an electro-thermal migration effect circuit model of the interconnection line is obtained, so that the system dimension is effectively compressed; therefore, the calculation complexity is effectively reduced, the solving efficiency is remarkably improved, the stress evolution in the complex multi-branch interconnection line can be rapidly analyzed, meanwhile, the cavity length evolution is dynamically simulated, and the precision requirement and the efficiency requirement are both considered.

The invention relates to the technical field of LED lamp control, in particular to a matrix type dynamic partition PWM control device and method. The method comprises the following steps: performing parallel branch control node analysis on an LED array, and calculating a branch initial impedance value of a branch to obtain a branch reference impedance spectrum; continuously driving the LED array during the normal working period of the LED array, and performing temperature value compensation through the branch reference impedance spectrum to obtain dynamic branch temperature distribution data; according to the dynamic branch temperature distribution data, electric-thermal duty ratio compensation is carried out on each branch in the LED array, and partition modulation degree data is generated; bistable voltage waveform analysis is carried out according to partition modulation degree data, and then matrix type dynamic partition PWM control is achieved. According to the invention, an electric-thermal comprehensive compensation and phase deviation control mechanism is adopted, the dynamic partition management of the LED array is realized, and the problems of hot spot suppression and uniform light emission of the large-scale LED array are solved.

The present invention relates to the technical field of voltage control, and specifically discloses a distributed new energy substation area voltage control method and system, including: obtaining the phase angles of all access nodes at all sampling moments based on all real-time data of all access nodes; obtaining the power loss values of all access nodes at all sampling moments based on the phase angles of all access nodes at all sampling moments, and obtaining the voltage offset values of all access nodes at all sampling moments based on all real-time data of all access nodes at all sampling moments; obtaining the node analysis matrix of all access nodes and the voltage control result of the new energy substation area based on the power loss values of all access nodes at all sampling moments and the voltage offset values of all access nodes at all sampling moments. The present invention reduces the losses generated when all access nodes in the new energy substation area are connected, and efficiently improves the stability of the power grid in the new energy substation area.

The present disclosure relates to a computer-implemented method (20) for simulating a power circuit (10), wherein the method comprises: - determining (S20) a modified nodal analysis, MNA, model of the power circuit, - translating (S21) the MNA model into a Laplace model which describes relations between circuit waveforms and power sources waveforms with a matrix of Laplace functions, - determining (S22) characteristic frequencies of the power circuit based on the matrix of the Laplace model, - determining (S23) transfer functions from one circuit waveform to each of the other circuit waveforms, based on the matrix of the Laplace model, - determining (S24) weighting coefficients for characteristic functions of the characteristic frequencies, based on an initial state of passive energetic components of the power circuit and based on the transfer functions, - predicting (S25) the circuit waveforms of the power circuit based on the characteristic frequencies, the transfer functions and the weighting coefficients.

The present invention discloses a transmission tower line simulation method, apparatus, device, and storage medium. A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for a first subsystem consisting of a lightning channel, a tower, and overhead line segments directly connected to the tower. A one-dimensional time-domain finite difference method is used to establish a multi-conductor transmission line model for a second subsystem consisting of overhead line segments not directly connected to the tower. Interface node analysis equations are established between the first and second subsystems to jointly solve for the node voltages and branch currents of a high-voltage overhead transmission line system with a grounding wire. This method addresses the technical problems of large errors in tower surge assessments caused by traditional transmission tower models that fail to consider the mutual coupling between the lightning channel, tower, and transmission line, and inaccurate analysis of lightning surge impacts caused by the TEM-based MTL model's inability to accurately capture the true propagation behavior of electromagnetic waves on transmission line towers during lightning strikes.

The present invention discloses a ferroelectric capacitor modeling method for circuit simulation, comprising the following steps: Step 1: Modifying the nodal analysis method to link MNA with the MNA model of Fecap; Step 2: Forming the MNA model of the Fecap element, based on the MNA, using the Fecap L-K model formula to obtain a compensation equation, which is used to solve the equation for the unknown variable, to obtain the final Fecap element admittance matrix G and the known quantity vector column RHS, thereby obtaining the Fecap MNA model. Based on the MNA, the present invention uses the Fecap physical model formula and Kirchhoff's current law and Kirchhoff's voltage law to represent the unknown variables, forming the Fecap model code, and making the Fecap SPICE simulation more accurate and faster.

The invention discloses a modeling and simulation method of a power electronic converter based on high-order numerical integration. The modeling and simulation method comprises the following steps: constructing a three-point integration formula based on a differential quadrature method, and constructing a four-point integration formula based on a single-step block method; taking voltage at two ends of the switching device as a voltage source, and obtaining discrete model expressions of on and off states of the switching device according to the constructed four-point integral formula and the four-point integral formula; determining optimal parameters of the switch discrete model of the switch device; calculating a historical current source by adopting system steady-state values of the switching device in different states; a topological structure of the power electronic converter and an external circuit of the power electronic converter are subjected to simulation analysis, a simulation step length is set as delta t, and a node analysis method is adopted to obtain a time domain change waveform of a required system state variable. According to the invention, an improved L / C constant admittance switch model based on a high-order numerical integration algorithm is adopted, so that stable transition of admittance is realized; and a historical current source item is calculated by adopting a circuit constraint equation in a switching steady state, so that the stability and reliability of a simulation result as well as the calculation precision and efficiency are improved.

The disclosed embodiments relate to the technical field of package interconnect reliability analysis. A method and apparatus for constructing a circuit model for the electro-thermal migration effect of interconnects is provided. Based on the Korhonen governing equations and boundary conditions, the electro-thermal migration effect is converted into circuit parameter changes, capturing the significant influence of temperature and temperature gradients on atomic migration. An equivalent circuit model of the interconnect under the electro-thermal migration effect is derived. An improved node analysis method is used to determine the circuit matrix equation corresponding to the equivalent circuit model. The circuit matrix equation is then subjected to dimensionality reduction to obtain the electro-thermal migration effect circuit model of the interconnect. This method effectively compresses the system dimensions, thereby reducing computational complexity and significantly improving solution efficiency. This method enables rapid analysis of stress evolution in complex multi-branch interconnects and dynamic simulation of void length evolution, balancing both accuracy and efficiency requirements.

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.

The invention discloses a power transmission tower line simulation method, device and equipment and a storage medium, and the method comprises the steps: building a partial element equivalent circuit model for a first subsystem composed of a lightning channel, a tower and an overhead line segment directly connected with the tower through employing a partial element equivalent circuit method; establishing a multi-conductor power transmission line model for a second subsystem formed by overhead line segments which are not directly connected with the tower by adopting a one-dimensional time domain finite difference method, and establishing an interface node analysis equation of the first subsystem and the second subsystem; and jointly solving the voltage of each node and the branch current of each branch of the high-voltage overhead transmission line system with the grounding wire. The method solves the problems that a traditional transmission tower model does not consider mutual coupling among a lightning channel, a tower and a transmission line, so that the error of tower surge evaluation is large; and the technical problem that the analysis on the lightning surge influence is inaccurate due to the limitation that the MTL model based on the TEM cannot accurately capture the real propagation behavior of the electromagnetic waves on the power transmission line tower during lightning stroke is solved.

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 invention is suitable for the technical field of copper wire control, and particularly relates to a copper wire size precision online control method, which comprises the following steps: determining usable manufacturing equipment, and sending a self-inspection instruction to the usable manufacturing equipment; self-inspection information is received, and copper wire information is obtained; wherein the self-inspection information is used for indicating a detection state obtained by self-inspection of the available manufacturing equipment, and the copper wire information is used for indicating the size precision requirement of the copper wire and the total length of the copper wire needing to be manufactured; performing node analysis based on the self-inspection information and the copper wire information to obtain node control information; wherein the node control information is used for indicating a plurality of detection nodes in a copper wire manufacturing stage; and controlling the dimensional precision of the copper wire based on the node control information. According to the online control method for the size precision of the copper wire, the conditions that the state of manufacturing equipment is uncontrollable and detection lags are avoided as much as possible, and the delivery efficiency of the copper wire is improved.

The invention provides a low-voltage power supply and distribution system bus duct wiring fault prediction method and system, and relates to the technical field of cable wiring, and the method comprises the steps: constructing a bus duct topological structure; receiving a new equipment demand; according to the position of the newly added equipment, carrying out clamped node analysis on the bus duct topological structure, and positioning a plurality of alternative segments; constructing a plurality of segmented twin models, performing wiring fault prediction, and outputting a plurality of segmented safety coefficients; positioning a target bus duct segment in the plurality of alternative segments; and in the low-voltage power distribution system, taking the clamping alternative node of the target bus duct segment as a target clamping node, and carrying out bus duct clamping construction of the newly added plug-in box. According to the method and the device, the technical problem that the low-voltage power supply and distribution system is difficult to identify the risk in advance when facing the newly-added equipment, so that the fault or the equipment is damaged is solved, and the clamping position of the newly-added plug-in box is positioned by predicting the fault risk of different clamping positions, so that the operation and maintenance efficiency of the low-voltage power distribution system is improved.

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.