208 results about "Transient analysis" patented technology

The invention discloses a sensor array multi-objective optimization method for magnetic field signal denoising, and the method comprises the implementation steps: building a magnetic field interference model in a constraint mode, carrying out the transient analysis, and obtaining the time sequence data of magnetic field signals collected by all sensors; setting an optimization index, taking the optimization index as a multi-target fitness function, optimizing the multi-target fitness function, and obtaining an optimal auxiliary sensor layout scheme under the condition that the fitness function value is maximum; establishing a main sensor and an optimal auxiliary sensor array based on the optimal auxiliary sensor layout scheme; and in an interference source influence environment, processing a noise signal of the optimal auxiliary sensor array based on the trained deep learning network model to obtain a denoised magnetic field signal of the main sensor, reconstructing a main position noise through sensor layout optimization and auxiliary sensor array noise, and obtaining an optimal auxiliary sensor array. Magnetic field signal denoising under the condition that an object is disturbed is realized, and the precision of magnetic field testing is improved.

The invention relates to the technical field of bridge management, in particular to a bridge informatization management system based on digital twinning. Comprising a stress acquisition device and a traffic flow acquisition device, the stress acquisition device is arranged at a key stress point of a bridge, and the server comprises a bridge modeling module, a data receiving module, a model prediction module and a state analysis module; the bridge modeling module is used for establishing a bridge high-precision three-dimensional model through BIM and constructing a digital twinborn body of the bridge; the data receiving module is used for receiving the sensor measured value uploaded by the stress acquisition device and the traffic flow information uploaded by the traffic flow acquisition device; the model prediction module is used for converting the traffic flow data into a dynamic load and inputting the dynamic load into a digital twinborn body of the bridge for transient analysis to obtain a model prediction value of each bridge key stress point; and the analysis module is used for judging the bridge state according to an error value of the model prediction value and the sensor actual measurement value, and generating bridge state early warning when the error value exceeds an error threshold value.

The invention discloses a transient optimization control method based on a parallel system of a virtual synchronous machine and a grid-following converter. The method comprises the following steps: 1, constructing a topological structure of the parallel system of the virtual synchronous machine and the grid-following converter; 2, based on the topological structure, establishing a mathematical model of a parallel system, including an active loop equation and a reactive loop equation of a virtual synchronous machine and a phase-locked loop equation of a grid-following converter; 3, constructing an equivalent circuit, a network equation and a transient analysis model of the parallel system based on the mathematical model; 4, on the basis of the equivalent circuit, the network equation and the transient analysis model, determining conditions met by respective balance points of the virtual synchronous machine and the grid-following converter by using a balance point method; and 5, when the power grid has a fault, constructing a transient optimization strategy according to a condition satisfied by the balance point so as to realize transient optimization control of the parallel system. According to the method, the control modes of a virtual synchronous machine power loop and a grid-following type converter phase-locked loop can be improved, so that the transient stability of a parallel system converter is improved.

The invention discloses a fire fighting system intelligent management method and device based on intelligent property management, and relates to the technical field of data management. The intelligent management method and device for the fire fighting system based on the intelligent property management comprises the following steps: S1, dynamically triggering and collecting a multi-source fire fighting data set through multiple protocols, and temporarily storing the multi-source fire fighting data set at the edge in a normalized manner; s2, constructing an event full-period window and a ternary association index of the event, the time sequence data and the original message; s3, performing double-track storage of the semantic analysis data and the original message, and constructing multi-dimensional index association; s4, reconstructing a visual playback alarm process through edge cloud increment synchronization and a multi-dimensional time sequence chain; and S5, performing transient analysis, protocol upgrading and responsibility evidence obtaining based on the cloud data collaborative link and the original message data set. According to the method, the complete acquisition of the fire-fighting data and the reproducibility of the event process are effectively improved, and the problem that in the prior art, only polling recording of single-point alarm is carried out, and an original message is discarded, so that the transient process and message-level evidence is lost is solved.

The invention belongs to the field of photovoltaic technology, and discloses a mountain photovoltaic array load analysis method considering a shielding effect, which comprises the following steps of: performing transient analysis (numerical method) on a photovoltaic array under the action of wind load, and then emphatically analyzing a first row of photovoltaic windward side and photovoltaic panels on the outermost periphery of the array; the pulsating pressure under the wind load is obtained, then whether the photovoltaic supports in the areas are intensified or not is evaluated and analyzed on the basis of the end, and the fatigue effect of the supports is mainly considered; and the other one is the influence of the shielding effect of the first row of photovoltaic panels on the back row of photovoltaic panels on the windward side of the array, so that the mountain photovoltaic array load can be accurately analyzed.

The invention provides a method, medium and equipment for evaluating stability evolution of an unsaturated soil slope in a cold region, and establishes a framework combining a soil-atmosphere interaction model and a cold region unsaturated soil water-steam-heat coupling transmission model. A finite element transient simulation program for simulating the water-heat state response of the unsaturated soil body in the cold region under the action of long-term and short-term climates is developed, and the technical problem that when a traditional numerical model simulates the sand freezing and thawing phenomenon, the latent heat release amount is prone to losing due to the narrow phase change temperature interval is solved. According to a limit analysis upper limit theorem, a slope stability evaluation method is established by adopting a discretization recursion technology, and a novel iterative solution scheme combining a dichotomy and a meta-heuristic optimization algorithm is innovatively provided. A finite element transient analysis model-stability evaluation coupling method is provided, so that the stability evolution evaluation of the unsaturated soil slope in the cold region driven by climate data can be carried out.

The invention relates to the technical field of new energy grid-connected control, in particular to a fault stage transient stability analysis method and system for a following-constructed network type converter series-parallel system, and the method comprises the steps: enabling a constructed network type converter to be equivalent to a controlled voltage source series impedance, enabling a following network type converter to be equivalent to a controlled current source, and enabling the controlled current source to be equivalent to a controlled voltage source series impedance; the whole series-parallel system is equivalent to a scene in which double voltage sources and a single current source are jointly connected in parallel to a PCC point, and a series-parallel system model is constructed; according to the series-parallel system model, respectively representing an active power coupling term of the network-building type converter and a voltage coupling term of the network-following type converter under the condition of considering parallel connection of the network-following type converter and the network-building type converter; according to the coupling term, remodeling an active loop control structure of the network-constructing converter and a phase-locked loop synchronization structure of the network-following converter, and obtaining a transient analysis model of the series-parallel system considering the coupling term; the transient stability of the hybrid system in the power grid fault stage is analyzed through the transient analysis model, and the influence on the transient stability is effectively represented.

The invention relates to the technical field of nuclear reactor core calculation, and discloses a method and a device for calculating a physical and thermal coupling numerical value of a reactor, a medium and equipment. In the process of calculating the physical and thermal coupling numerical value of the reactor, a neutron space-time dynamic model is subjected to time discretization by adopting a diagonal implicit Runge-Kutta format; in the transient analysis process, coupling calculation is carried out through a simple operator splitting method and a Picard iteration method to obtain a calculation value, coupling global solution variables are selected based on a Newton method, a global solution residual equation is established, solving is carried out through a Krylov subspace solution method based on the coupling global solution variables and the global solution residual equation, a JFNK iteration process is constructed, and a transient analysis result is obtained. And finally, taking the calculated value as an initial value, establishing a hybrid iteration process according to the initial value and the JFNK iteration process, and calculating to obtain a reactor transient physical thermal full-coupling numerical solution. According to the method, excessive solution is avoided, the convergence speed is increased, and stable and rapid convergence calculation is realized.

The invention discloses a series-parallel system transient stability analysis and fault ride-through control method considering current limiting, and belongs to the field of power fault analysis. In order to reveal an action mechanism of a current amplitude limiting and converter coupling effect on the transient synchronization stability of the hybrid system, the method comprises the following steps: firstly, considering the influence of control mode switching of a constructed network type converter, and establishing a transient analysis model of the hybrid system considering a current amplitude limiting link; then, based on a phase plane method, analyzing an action rule of converter control parameters on system transient stability, determining an optimal active power reference value and a saturation current phase angle of the grid-forming converter during a fault period, and proposing a fault ride-through control strategy according to the optimal active power reference value and the saturation current phase angle; and finally, verifying the correctness of theoretical analysis and the effectiveness of the proposed control strategy through multi-working-condition simulation.

The invention discloses a collaborative configuration method and system for a converter valve sub-module and a bypass switch, and relates to the technical field of flexible direct current transmission. The bypass switch and a reactor unit are connected in series to obtain a bypass circuit; the reactor unit comprises an inductor and a resistor which are connected in series; connecting a bypass circuit to two ends of each sub-module in the converter valve to obtain a cooperative circuit; establishing a transient analysis model of a submodule in the converter valve; performing multi-target constraint on the transient analysis model according to the operation condition of the converter valve, and solving the transient analysis model to obtain a first type selection parameter of the reactor unit; simulating a capacitor discharge working condition and a bypass switch false closing working condition to obtain a second type selection parameter of the reactor unit; and configuring a cooperative circuit of the sub-module in the converter valve by adopting the second type selection parameter. By adopting the embodiment of the invention, the closing current of the bypass switch can be effectively reduced, the rising rate of the short-circuit current when the bypass switch is mistakenly closed is effectively reduced, and the protection success rate is improved.

The invention relates to an electromagnetic transient analysis method and device of a coaxial cable, computer equipment, a readable storage medium and a program product. The method comprises the following steps: determining the size of a simulation area of the coaxial cable based on the real size of the coaxial cable, and dividing the simulation area of the coaxial cable into a plurality of grids based on the size of the simulation area and a preset rule; on the basis of the magnetic conductivity, the dielectric constant and the conductivity of the outer conductor and the magnetic conductivity, the dielectric constant and the conductivity of the inner conductor, constructing loss impedance of the coaxial cable per unit length to obtain target loss impedance of the coaxial cable per unit length; based on the corrected dielectric constants and the corrected magnetic conductivities corresponding to the grids and the target loss impedance, an electromagnetic analysis model corresponding to the simulation area is constructed; and obtaining an electromagnetic transient analysis result of the coaxial cable based on the electromagnetic analysis model. By adopting the method, electromagnetic transient analysis of the coaxial cable can be realized.

The invention discloses a transient analysis method and system for a multi-component working medium system of a gas cooled reactor, and relates to the technical field of safety numerical analysis of a nuclear reactor system.The transient analysis method comprises the steps that forming reasons of multi-component working media in the gas cooled reactor are analyzed, and data are collected and preprocessed; a first loop and a second loop of the system are constructed, and mathematical models for thermal hydraulic analysis are constructed respectively; and performing multi-component working medium transient analysis, and outputting the temperature of each control body. According to the method, the uniform mass conservation equation of the mixture is established for the multiple components of working media in the system, the conservation equation does not need to be independently listed for each component, the solving process is simplified, and the calculation efficiency is improved. Meanwhile, the method can be used for analyzing migration of each component working medium in the loop due to coolant flowing. Besides, in the transient analysis method of the system, the influence of the composition, concentration and thermal parameters of the multi-component working medium on the thermal hydraulic solution of the whole system in the generation and migration process is considered, so that the method accords with reality, and the accuracy of the method is guaranteed.

A calculation method for a transformer winding considering a frequency-dependent loss, comprising: according to simulation requirements, defining key parameters calculated by using a finite-difference time-domain (FDTD) algorithm; constructing an equivalent flat wire model in an FDTD grid; calculating frequency-dependent internal impedance per unit length of a flat wire; and on the basis of a vector fitting method and a time-domain convolution calculation method, substituting the frequency-dependent internal impedance into a time-domain equation of the FDTD algorithm for updating and iterative solving, so as to obtain an electromagnetic field calculation result. In the present invention, on the basis of the vector fitting method and time-domain convolution calculation, the impact of the frequency-dependent characteristics of an electromagnetic field distributed in a conductor on an electromagnetic transient process is accurately considered during the FDTD time-domain solving, so that the calculation accuracy and efficiency of conventional FDTD algorithms and even conventional cross-scale modeling techniques can be significantly improved, thereby carrying out the targeted electromagnetic transient analysis on the reliability, safety, and predictability of transformers, and achieving the early detection of potential faults and defects, or formulating targeted maintenance plans and repair schemes.

The invention discloses a transient stability analysis method, device and system for a new energy power system, and belongs to the technical field of new energy power generation, and the method comprises the steps: setting a network-type converter of the new energy power system as a voltage source in a normal state, and switching the network-type converter into a current source in a fault state; and representing a first transient analysis model corresponding to the grid-forming converter and a second transient analysis model corresponding to the grid-forming converter by using a curved surface, thereby determining respective power angle stable regions of the two converters, analyzing actual power angles of the new energy power system when different power grid voltages drop, observing power angle swing tracks of the converters, and calculating the power angle stability of the new energy power system. And therefore, transient weak converters corresponding to different power grid voltage sags can be accurately reflected. Compared with the prior art, the method can accurately describe the power angle stable areas of the grid-forming converters, simulates the new energy power system under various fault conditions, provides a powerful basis for preventing system instability in advance, and improves the operation reliability of the new energy power system.

The invention relates to a segmented fusion SPICE to IBIS model conversion method and system, and the method comprises the steps: obtaining data, precisely extracting voltage / current curve data from a simulation result of SPICE simulation, carrying out the transient analysis, guaranteeing that a finally generated IBIS model can accurately reflect the electrical behavior of the SPICE model, increasing the voltage / current sampling point density of DC scanning in the SPICE simulation, and obtaining the electrical behavior of the SPICE model. Particularly, in a non-linear severe change region, a segmentation interval is adaptively adjusted according to curvature change, so that the accuracy of curve data extraction is ensured; a compensation item is added in a [Model] section of the IBIS model to compensate the packaging parasitic effect, the accuracy of model conversion is improved, meanwhile, simulation data under the multi-PVT condition is compressed through PCA, redundant information is reduced, the model generation efficiency is improved, and high-precision and high-efficiency conversion from the SPICE model to the IBIS model is achieved.

The invention provides an external flow field analysis method and device for insulator cleaning of a laser carried by an unmanned aerial vehicle. The method comprises the following steps: importing a pre-established three-dimensional geometric model of the laser carried by the unmanned aerial vehicle into a fluid-thermal transient analysis system; determining a fluid domain of the three-dimensional geometric model based on a fluid-thermal transient analysis system; performing grid division on the fluid domain to obtain a grid fluid domain; determining material attributes of the unmanned aerial vehicle and the laser and boundary parameters and initial parameters of a fluid domain; based on a fluid-thermal transient analysis system, determining a simulation scene in which the unmanned aerial vehicle carries the laser to clean the insulator; and determining an external flow field of the gridding fluid domain based on the simulation scene, the boundary parameters, the initial parameters and the material attributes so as to ensure the attitude stability of the unmanned aerial vehicle, thereby improving the insulator cleaning efficiency.

The invention relates to a vibration analysis method and device of a generator stator, equipment and a storage medium. The method comprises the steps of determining electromagnetic force of the generator stator based on a structural model of the generator stator; decomposing based on the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load component comprises a plurality of load values distributed along the circumferential direction of the generator stator; and applying the plurality of force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator. According to the method, a plurality of force waves are superposed to simulate the rotation effect of the force waves in the actual operation process, the accurate load used for transient analysis is generated, the input load can be more accurate, and therefore the calculation result can truly reflect the dynamic response of the iron core along with time and space distribution; an analysis result is closer to an actual measurement result, and the reliability is higher.

The invention relates to the technical field of monitoring modeling, in particular to an electrostatic precipitation smoke emission dynamic modeling method based on multi-parameter coupling analysis, which comprises the following steps: calculating electric field rate and acceleration through sliding window difference, judging electric field abrupt change trigger parameter adjustment, normalizing particle size and charge density, and mapping disturbance intensity index. And calculating response delay and a gradient field to generate a disturbance coefficient, transferring a model weight when the disturbance exceeds a threshold value, performing fitting reconstruction, and performing regression weight reverse normalization to output a steady-state parameter group. According to the method, electric field dynamic characteristics are captured through equal-interval sampling in combination with a sliding window, an acceleration super-threshold model is constructed through second-order difference, a dynamic adjustment mechanism is triggered, particle size and charge density are normalized, disturbance intensity is mapped through linear interpolation, speed and density abrupt change are quantized through gradient weighting, and weight transfer and a least square method are introduced to reconstruct parameters. The transient analysis capability and robustness of the model are improved, and high-precision synchronous mapping of the emission trend and the equipment state is realized.

The invention relates to a method for determining back convex deformation and ballistic limit velocity of an orthogonal laminated board under impact of a flat-head bomb, and belongs to the technical field of damage and protection. According to the method, transient back convex deformation, moving hinge propagation and ballistic limit velocity of the UHMWPE laminated board along with progressive penetration under the impact of the flat-head projectile can be determined, and any fitting parameter and empirical formula do not need to be used. The determination result of the method passes test verification, and the calculation result and the test result have good consistency, so that the method provided by the invention is high in determination precision. According to the method, transient analysis and the Lagrangian method are combined, the progressive penetration failure criterion is introduced, and finally the back convex deformation and the ballistic limit of the UHMWPE laminated board are determined.

The invention provides a mechanical arm switching control transient analysis method based on system response characteristics. The mechanical arm switching control transient analysis method comprises the following steps that 1, a mechanical arm input and output response model is constructed; 2, mechanical arm switching input serves as a segmented continuous function, and an input and output relation is established; and step 3, introducing a step function to separate steady-state output from transient-state output, and analyzing a transient-state process. According to the method, a mechanical arm switching input signal is converted into a segmented continuous function through a step function, the root of generation of the mechanical arm switching transient state is researched, and the relation between the mechanical arm transient state and the historical process is established. According to the method, the mechanical arm switching control transient state is analyzed on the basis of system response characteristics in combination with historical dynamic information, the mechanical arm transient state generation mechanism is analyzed, and analysis is more accurate and reliable.

The application provides a floor grinding machine gear box guide plate structure parameter optimization design method, which is used for determining the optimal values of three radial clearances between the guide plate and the gear tooth top. Firstly, a parameterized gear box model containing clearance as a variable is constructed, and a gear oil stirring loss theoretical model is established based on the boundary layer theory and the fluid resistance theory; taking the maximum lubrication efficiency as the target and the oil stirring power loss not exceeding the set threshold as the constraint condition, a central composite design method is used to select representative sample points in the design space; through computational fluid dynamics simulation, a moving particle semi-implicit method is used for splash lubrication transient analysis to obtain performance data of each point; based on the simulation data, a high-precision proxy model is constructed; finally, under the condition of meeting the oil stirring power loss constraint condition, the maximum lubrication efficiency is taken as the target for optimization solving to obtain the optimal clearance combination. The method realizes the quantitative design from parameters to performance, and effectively replaces the traditional trial and error method.

The application provides an electromigration reliability non-uniform discrete equivalent circuit modeling method and system, adopts an equivalent circuit-based method to analyze electromigration stress evolution of a general complex interconnection structure, fully considers a thermal field effect in a model, realizes stress analysis equivalent circuit modeling under multi-physical field coupling, and solves the problem of waste of computing resources in processing large-span interconnection structures by using a traditional uniform discrete method, avoids unnecessary transient simulation on an immortal interconnection tree, reduces the computing load of full-chip-level analysis, and realizes efficient and high-precision transient analysis of electromigration reliability of a large-scale interconnection network under multi-physical field coupling effects.

The invention relates to the technical field of industrial data analysis, and discloses an original data feature analysis system in water meter detection, comprising: a pulse data aggregation unit for acquiring an original pulse time sequence; the time sequence difference processing unit is used for receiving the original pulse time sequence and executing first-order difference operation to generate a first-order time sequence difference value sequence; the feature decoupling shunting unit is used for executing logic locking by using a monitoring carrier environment baseline scalar, and dividing a first-order time sequence difference value sequence into a steady state processing channel and a transient analysis channel; the intrinsic mode mapping unit is used for pre-storing intrinsic mode feature vectors; the transient distortion judgment unit is used for extracting the frequency domain feature vector, executing orthogonal projection mapping with the intrinsic mode feature vector and outputting an effective transient distortion tensor, the problem of feature information entropy collapse of the high-frequency pulse sequential sequence in the dimensionality reduction aggregation process is solved, and a semantic gap between an information processing domain and a physical design domain is eliminated.

The invention relates to an electromagnetic transient analysis method, an electromagnetic transient analysis device, electromagnetic transient analysis equipment, a storage medium and a program product for a single-core armored cable, and the method comprises the steps: obtaining impedance information of the unit length of the single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; and inputting the impedance information per unit length of the single-core armored cable and the target evaluation parameter into a preset analysis model to carry out electromagnetic transient analysis on the single-core armored cable, thereby obtaining an analysis result. Wherein the target evaluation parameters comprise region parameters of the target region and all grid parameters in the target region, and the preset analysis model is constructed by a topological structure of the single-core armored cable. According to the method, the topological structure and the impedance information of the single-core armored cable are considered in the process of constructing the preset analysis model, so that the constructed preset analysis model is closer to reality, and the obtained electromagnetic transient analysis result of the single-core armored cable is more accurate.

The application discloses a temperature rise determination method and determination device of a dry-type transformer. The temperature rise determination method of the dry-type transformer comprises the following steps: establishing a geometric model of the dry-type transformer; wherein the geometric model is determined by heat sources in the dry-type transformer; performing transient analysis on internal natural convection of the dry-type transformer according to the geometric model, and determining temperature change conditions of specific points in the dry-type transformer under different load rates; determining a transient temperature rise model of the specific points according to the change conditions, wherein the temperature rise model is a corresponding relationship model of temperature rise values of the specific points, load rates and working time; and determining the temperature rise values of the specific points in the working process of the dry-type transformer according to the transient temperature rise model, so that simulation images can be easily obtained through simulation software, and the temperature rise distribution conditions of the dry-type transformer under different load rates can be quickly obtained.

The invention belongs to the technical field of transient analysis of a new energy grid-connected system, and particularly relates to a transient overvoltage analysis method of a direct-driven wind power grid-connected system under an asymmetric fault, which comprises the following steps: acquiring three-phase asymmetric voltage and current, and constructing a positive and negative sequence dq control model of positive and negative sequence bisynchronization of a direct-driven wind power plant station; establishing a mapping relation with a symmetric component method, and determining a positive-sequence dynamic reactive current increment and a negative-sequence current suppression coefficient according to a converter control strategy; establishing sequence network boundary conditions under various asymmetric faults; enabling the direct-driven wind power plant to be equivalent to a frequency-related controlled sequence impedance source, and obtaining equivalent sequence impedance of the wind power plant; establishing a sequence network equation considering wind power dynamic support; calculating the current and sequence voltage of the fault point, and obtaining a three-phase voltage through symmetric component inverse transformation; and an overvoltage coefficient is calculated, and a quantitative relational expression between the overvoltage coefficient and the negative-sequence current suppression coefficient is established and applied. The method provides theoretical support for parameter setting and capacity planning of the wind power integration system.

The invention relates to a refined frequency-dependent mutual impedance three-core power cable high-frequency transient model, and belongs to the field of power disturbance analysis of power systems. The model is composed of a plurality of distributed cable units (ReCABLE units), each ReCABLE unit represents a three-core power cable section with the unit length of 10, a plurality of three-core power cable sections with the unit length of 10 are built into a complete three-core power cable, and the distributed cable units with the corresponding number are selected for the complete three-core power cable according to the total length of the complete three-core power cable; and each ReCABLE unit comprises three refined frequency-varying mutual impedance modules Mcs (f), three frequency-varying admittance modules Yin (f), three frequency-varying wire core impedance modules Zc (f) and one frequency-varying metal sheath impedance module Zs (f). According to the method, a high-precision model is established through a vector fitting-circuit synthesis-passive optimization method based on mutual impedance frequency change data calculated through experimental measurement, so that the defect of an existing cable model in mutual impedance parameter simulation precision is effectively overcome; and a more reliable model basis is provided for transient analysis research and engineering application of the three-core power cable.

The invention provides a mechanical arm event trigger control transient analysis and trigger controller design method based on response characteristics. The mechanical arm event trigger control transient analysis and trigger controller design method comprises the following steps that 1, a mechanical arm input and output response model is constructed; 2, system input serves as a piecewise function, and a trigger control transient relation is analyzed; and step 3, proposing a new time constraint event triggering strategy to avoid a sesame phenomenon. According to the method, the transient process is combined, the time constraint condition is introduced, the mechanical arm event triggering control strategy is established, the false triggering frequency is reduced, the sesame phenomenon is avoided, and the communication overhead is reduced.

The invention relates to the field of photovoltaic grid-connected management and control, in particular to an intelligent grid-connected management and control method and platform for a photovoltaic power station, and the method comprises the following steps: collecting the operation information of a target photovoltaic power station, carrying out the transient analysis, and constructing a transient operation state set; performing continuous time tracking on the transient operation state set to generate a photovoltaic evolution track; performing comprehensive change frequency analysis on the photovoltaic evolution track to obtain a change frequency matrix; synchronously acquiring operation parameters of a power grid side; performing grid-connected risk assessment on a change frequency matrix according to the power grid side operation parameters, and generating a grid-connected risk assessment value; grid-connected risk assessment is carried out based on the grid-connected risk assessment value, and when it is judged that the target photovoltaic power station meets the direct grid-connected condition, synchronous grid-connected processing is executed; when it is judged that the target photovoltaic power station does not meet the direct grid connection condition, grid connection power modulation is carried out, and intelligent grid connection management and control processing is completed. According to the invention, the safety and stability of photovoltaic power station grid connection are effectively improved.

The invention discloses a parallel solving method and system for a system of linear equations of an electric power system based on a Woodbury theory, and belongs to the technical field of large-scale electric power system computation.The method comprises the steps that a coefficient matrix of a network equation of the electric power system is obtained and subjected to block representation; performing truncated singular value decomposition on the non-diagonal block coupling matrix, and realizing low-rank decomposition through an Arnoldi iterative algorithm; carrying out inversion on the coefficient matrix based on a Woodbury matrix identical equation, and carrying out parallel calculation on each block sub-matrix and an intermediate variable; and solving the system of linear equations by using the inversed matrix. According to the method, the low-rank characteristic and parallel computing advantages of the inter-region coupling matrix of the power system are fully utilized, the solving efficiency of the large-scale linear equation set is remarkably improved, and the method is suitable for transient analysis, real-time simulation and other high-performance computing scenes of the power system.