443 results about "Transient state" patented technology

The present application relates to the technical field of power system stability control, and is a steady-state voltage control method and system for reducing transient voltage instability risk of a new energy collection station, the method comprising: establishing a new energy collection station bus transient voltage model of a new energy sending end power grid after a DC bipolar blocking fault; setting a new energy collection station transient voltage instability limit of the new energy sending end power grid after the DC bipolar blocking fault; and setting a steady-state voltage control threshold for reducing the transient voltage instability risk of the new energy collection station bus based on the new energy collection station bus transient voltage model. The present application can achieve the purpose of reducing transient voltage instability risk by controlling the steady-state operating voltage of a high-proportion new energy sending end power grid without increasing dynamic reactive power compensation equipment. The present application is used to solve the problem of transient voltage instability caused by new energy off-grid of a new energy collection station of a DC sending end power grid after a DC fault due to excessively high transient voltage caused by excessively high steady-state operating voltage of the power grid.

The application relates to the technical field of power system energy storage planning, and specifically discloses a system for optimizing configuration of energy storage equipment based on an AC-DC power grid, which acquires a basic data set; adopts a density peak clustering algorithm to reduce scenes of wind and light output and load time series data, and generates a multi-scene time series data set; obtains electrical quantities of each node through power flow calculation, and calculates modal sensitivity indexes of each node on network loss and voltage stability based on a Jacobian matrix modal decoupling analysis, so as to screen a set of energy storage configuration nodes to be selected; takes the set of energy storage configuration nodes to be selected as the basis, takes minimization of the whole life cycle cost of the system as the target, and solves to obtain preliminary configuration power and capacity; substitutes the preliminary configuration scheme into electromagnetic transient simulation for dynamic response verification, and if the safety and stability requirements are met, the final scheme is output, otherwise, the constraint conditions are corrected according to response deviation and re-iterative optimization is carried out; the application realizes collaborative optimization between economy and dynamic safety and stability of the energy storage configuration scheme.

This application relates to the field of smart terminal technology and provides a method, system, apparatus, terminal device, and storage medium for multi-user collaborative editing. The method includes: immediately executing the operation instruction when a user's operation instruction is detected and updating the execution result to a local transient state; sending the operation instruction to a server, where the server performs conflict detection on the operation instruction, assigns a sequence number to the operation instruction, generates a pre-ordered operation instruction set, and updates the global baseline state; receiving the pre-ordered operation instruction set broadcast by the server; comparing the local transient state with the global baseline state based on the pre-ordered operation instruction set, and if there is a state difference, changing the local transient state to make it consistent with the global baseline state, and updating the consistent local transient state to the local baseline state. This application can efficiently and reliably achieve eventual consistency of the states of each client, improving the smoothness and efficiency of multi-user collaborative editing.

The application provides a transient ground potential rise induced coupling determination method through cable shielding layer, and belongs to the technical field of cable shielding layer.The application establishes a distributed parameter partial element equivalent circuit model of a grounding network, solves transient ground potential distribution by using a finite difference time domain method, obtains equivalent transfer impedance frequency characteristics of a braided shielding layer by using a four-port S parameter vector network analysis method and a variational asymptotic homogenization multi-scale algorithm, solves core line common mode voltage and differential mode voltage by establishing a multi-conductor transmission line equation group, constructs an artificial intelligence prediction model based on a topology perception graph neural network, solves a large-scale sparse admittance matrix by using a multilevel fast multipole method to obtain full network induced voltage distribution, and establishes a quantitative relationship model between ground potential rise and core line induced voltage, so that the technical problems that cable core line induced voltage caused by transient ground potential rise is difficult to accurately predict and effectively suppress are solved.

This invention relates to the field of power distribution network technology and discloses a direct-connected integrated energy storage-power flow conversion device and its control method. It employs a direct-connected multi-module series-parallel composite topology, organically integrating multiple functions—power flow conversion module, energy storage module, voltage support and current limiting module—into a single device. Based on a hierarchical coordinated control architecture designed for the three functional circuits, it achieves flexible and precise control of power flow between the two-terminal grids and efficient coordinated management of the energy storage units within the device. It also provides active voltage support and transient fault current limiting protection for the sending-end grid. This integrated design significantly reduces equipment redundancy, simplifies the overall system architecture, and, through the internal coordinated control of each functional module, significantly improves the device's operational reliability under complex conditions such as power flow reversal, load surges, and transient faults.

This application provides a method for monitoring faults in intermediate joints of 35kV ring network cables in urban rail transit, relating to the field of data processing. In this method, a cable segmentation diagram is constructed, and joint identification nodes and ring network status identifiers are generated. A synchronous observation array is established based on the station to collect transient voltage and current segments to form event evidence packages. Under the same ring network status, a set of propagation operators is constructed, and a virtual playback field is generated through recorrelation and superposition to produce a focused spectrum. Under the same operating context, a reversibility discrimination is performed to screen candidates for saturated critical states. A first focused spectrum and a second focused spectrum are generated, and structural fracture is synchronously checked. Finally, the target joint identification node is located, and the intermediate joint fault monitoring results are output. Implementing the technical solution provided in this application facilitates overcoming the dependence on continuous gradual changes and identifying the electric field reconstruction characteristics caused by space charge trap saturation, thereby improving the accuracy of abrupt degradation judgment.

The application discloses a novel power system dynamic simulation method and system based on an improved inverter model, relates to the technical field of novel power system stability analysis, and comprises the following steps: acquiring power system topology information, a control type of an inverter installed in the power system and an installation node, and constructing a node admittance matrix of an alternating current side system; according to the control type of the inverter, adding an adaptive bus model to the installation node of the inverter, and constructing an inverter state space model containing complete control links; performing power flow calculation on the alternating current side system by adopting a Newton-Raphson polar coordinate method, and taking the power flow calculation result as an initial value of electromechanical transient simulation calculation; respectively setting time domain simulation calculation methods of the alternating current side system electromechanical transient and the inverter side model, unifying simulation time and a step length, performing cyclic iteration solving of the alternating current side system and the inverter side model based on the initial value, and outputting a high-precision dynamic simulation calculation result of key parameters of the inverter until the simulation time ends.

This invention discloses a transient stability emergency control method based on the masking of actions in the dominant instability mode, belonging to the field of power system control technology. The method includes: constructing an action space based on control actions after masking illegal actions; inputting a decision-making agent to generate continuous action distribution parameters and a tripping ratio vector; interacting with a reinforcement learning environment based on the tripping ratio vector to obtain tripping decisions and constructing an experience pool; iteratively optimizing the agent based on the mapped state sequence, the control actions after masking illegal actions, and the reward function determined by the tripping decisions, collecting current operating condition data and current fault data, and determining whether the current dominant instability mode has changed; selecting a trained decision-making agent based on the current dominant instability mode, outputting the tripping decision, and executing emergency control. This invention solves the problem that existing methods generate illegal or invalid control actions under different instability modes, affecting control performance and even damaging system stability.

The application discloses a fault distance measurement method and system based on synchronous sampling of power distribution terminals, relates to the related technical field of fault distance measurement, and comprises the following steps: acquiring transient electrical quantity data synchronously sampled by multiple power distribution terminals after a fault of a power system; constructing a dynamic graph structure with the power distribution terminals as nodes and electrical connection relationships as edges according to real-time network topology information, inputting the transient electrical quantity data into a phase sequence disorder correction model to correct phase sequence disorder and extract spatial fault features; fusing zero-mode components of the transient electrical quantity data and node enhanced features; globally aggregating the fusion features of the nodes to obtain graph-level fusion features, extracting timing features, and regressing to obtain a fault distance. The application solves the technical problem that, in the prior art, it is difficult to fully utilize multi-source transient information to perform high-precision fault distance measurement in a complex power distribution network environment with dynamic topology and phase sequence disorder, and achieves the technical effects of improving fault distance measurement precision and adaptability to complex power distribution network environments.

This invention relates to the field of frequency regulation technology at the grid connection point of wind power converters, providing an adaptive regulation method and system for the frequency of wind power converters at the grid connection point. By dynamically capturing transient signals in the instantaneous values ​​of the three-phase voltage and current at the grid connection point (PCC) and quantifying their disturbance intensity and type characteristics, the virtual inertia and damping coefficient can be adaptively adjusted to generate an active power command that precisely matches the actual disturbances in the power grid. This refined regulation enables the wind power converter to provide highly differentiated frequency support for different disturbances, significantly enhancing the frequency stability of the power grid, while effectively suppressing unnecessary power fluctuations and energy losses, thus improving the economy and reliability of system operation.

This invention discloses a method, system, and apparatus for extracting the fundamental phasor of fault transient current, relating to the field of power system fault transient current analysis. The method involves acquiring N transient sampled currents and dividing them into M subsets according to a preset partitioning strategy. The discrete Fourier transform (DFT) output of each subset is then determined. Combining the DFT output expressions of each subset, the first DFT output corresponding to the first exponentially decaying DC offset component and the second DFT output corresponding to the second exponentially decaying DC offset component under the target subset are determined. Finally, the DFT output of the current fundamental phasor is determined by combining the DFT output expression and output results of the target subset, thus obtaining the fundamental phasor. This scheme pre-establishes a preset fault transient current discrete model and sets a preset partitioning strategy, achieving high-precision and rapid extraction of the fundamental phasor, which is beneficial for improving the reliability of power system relay protection.

This invention discloses a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance, comprising: determining the target generator set to be suppressed by the STATCOM controller, its target torsional vibration mode, and typical operating modes; for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method, calculating the effective range of phase-shifting angles in which the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation; performing an intersection operation on the effective ranges of phase-shifting angles of all typical operating modes to obtain a common safe configuration range; selecting phase-shifting angle values ​​from the safe configuration range and configuring them into the damping control channel of the corresponding key shaft torsional vibration mode in the STATCOM controller.

This invention discloses a parallel preset performance trajectory tracking control method for unmanned surface vessels (USVs) oriented towards high-precision operations. This method establishes a real USV system model considering environmental interference, then combines a fuzzy logic system, filters, data stacks, and an extended state observer to construct an artificial USV system model, achieving dynamic interaction between the virtual and real spaces. Subsequently, a preset performance function is designed and an error transformation function is constructed to solve the initial value constraint problem of the preset performance control. Finally, a kinematic guidance law and a parallel preset performance trajectory tracking controller are designed to generate control signals and achieve parallel control of the real and artificial USVs. This invention reduces the cost and risk of real-vehicle testing, improves control efficiency, optimizes the transient and steady-state performance of system trajectory tracking, and broadens the engineering application scope of preset performance control.

A flexible low-frequency transmission line inverse time protection method and system are provided. The method uses single-ended electrical quantity to constitute the criterion, after the fault occurs, the signal acquisition device is used to sample the phase current and voltage, and the resulting voltage and current are subjected to the Karenbauer transform to obtain the line mode and the zero mode components, and the integral value of the fault modulus components is used to construct the transient current energy, and the transient energy is used to construct the new inverse time limit characteristic curve equation, and the transition resistance compensation coefficient is introduced to improve the inverse time limit protection performance of the inverse time protection. The method is aimed at accelerating the action time of the protection when a fault occurs in a flexible low-frequency transmission line, and adopts the fault component to construct the transient energy value.

This invention relates to a method for calculating and evaluating the stability domain boundary of a new energy power system, addressing the problem of significant conservatism in evaluating the transient synchronization stability of grid-connected and grid-connected converters in current new energy power systems. The method includes: calculating the equilibrium point of the target nonlinear system and determining the local stable manifold of the stable equilibrium point; plotting the global stable manifold of the target nonlinear system using manifold theory and accurately observing the dynamic behavior of the target nonlinear system in the global state space; further extending the proposed transient stability domain boundary calculation method to a high-dimensional phase space; and quantitatively evaluating the transient stability margin of the target nonlinear system under different faults using the Monte Carlo method. The calculation method of this invention accurately characterizes the stability domain boundary of the target nonlinear system, providing important reference value for evaluating the transient synchronization stability of new energy power systems.

This invention discloses a T-type three-level hybrid rectification system and control method for charging piles. Addressing the issues of high switching losses in existing all-IGBT solutions and high costs in all-SiC solutions, this invention introduces a heterogeneous hybrid switching unit composed of parallel Si IGBTs and SiC MOSFETs in the vertical bridge arm of the T-type midpoint clamping topology. Through an RC hardware delay drive circuit, the SiC MOSFET is precisely controlled to turn on and off before switching transients, creating a zero-voltage turn-on and zero-current turn-off environment for the Si IGBT, completely eliminating the tail current loss of the IGBT. In the steady-state conduction, the Si IGBT bears the main load current. This invention has been verified by thermal loss modeling on the PLECS power electronics simulation platform, significantly reducing device costs while lowering switching losses by more than 80%, effectively improving the conversion efficiency and power density of the charging pile's rectifier stage.

The application relates to a low-voltage ride-through control method of a virtual synchronous generator considering power angle stability and overcurrent suppression, which comprises the following steps: obtaining a virtual synchronous generator control model, monitoring transient stability and voltage drop of the virtual synchronous generator control model, and obtaining a monitoring result; when transient synchronous instability appears in the monitoring result, adjusting an active power reference instruction during a transient period according to actual output active power by using an adaptive active power instruction strategy; and when voltage drop or voltage drop recovery appears in the monitoring result, suppressing transient impact overcurrent based on an adaptive virtual synchronous impedance control strategy. The application not only realizes non-divergence and non-fluctuation of a power angle during any voltage drop depth, but also realizes fast and smooth recovery to a normal influence mode without overcurrent.

This invention discloses a method, apparatus, medium, and product for configuring parameters of a flexible DC-DC transmission system. The method includes: acquiring network topology data, operational data, and initial main circuit parameters and initial control parameters of the flexible DC-DC transmission system connected to the AC / DC hybrid power grid; constructing an initial steady-state operating domain based on this data, and discretizing its boundaries to obtain multiple boundary operating points; substituting each boundary operating point into a preset flexible DC-DC transmission system simulation model to perform transient simulation under preset disturbance conditions, obtaining transient response data for each point; filtering the transient response data using preset safety constraint rules to obtain transient instability operating points; inputting the transient response data corresponding to the transient instability operating points into a preset multi-objective optimization model, and solving for the target main circuit parameters and target control parameters, thereby using these two data points to configure the parameters of the flexible DC-DC transmission system. This invention can improve the accuracy of parameter configuration for flexible DC-DC transmission systems.

The application discloses a kind of network type converter transient power angle nonlinear mathematical analysis modeling methods, this method is directed to the power system containing network type converter, lack of the mathematical analysis model of its transient power angle characteristic problem and proposes.The specific steps realized by the method are as follows: the system model of network type converter single-machine infinite system is constructed;Transient power angle nonlinear mathematical model of network type converter single-machine infinite system is established;Least square method is applied to fitting nonlinear differential equation;Transient power angle nonlinear differential equation after fitting is solved based on multiscale method.The application deduces the mathematical analysis model of network type converter transient power angle using circuit theorem, least square method and multiscale method, can predict the transient power angle response process of network type converter system in advance, compared with traditional phase diagram method, the mathematical analysis model can be analyzed network type converter transient power angle characteristic under different system parameters in large disturbance process.

The application discloses a power grid transient voltage instability expected fault tracing method and system, comprising: obtaining a two-dimensional feature vector corresponding to each fault scene in an expected fault set and a transient voltage stability conclusion label; determining a core instability set and a critical observation set of the fault scene based on the two-dimensional feature vector and the transient voltage stability conclusion label; clustering the core instability set and the critical observation set, and performing multi-dimensional feature imaging based on the clustering result to obtain a feature image corresponding to each instability mode cluster; and performing tracing analysis based on the feature image to obtain a tracing result. The application realizes intelligent focusing on key scenes and automatic induction of instability modes based on existing batch discrimination results and mechanism features through a customized screening, clustering and attribution process, and generates a structured analysis report which can directly support operation cognition.

The application discloses a kind of ring network cabinet fault diagnosis method, equipment and storage medium, method includes: through the synchronous acquisition operation data of multiple source sensor group deployed on ring network cabinet;After the pre-processing of the collected multi-source data, respectively extract improved mel frequency cepstrum coefficient, transient voltage feature, ultrasonic feature and electrical feature based on high-order cumulant;The extracted features are spliced to form high-dimensional fusion feature vector, and the compact features are obtained by dimension reduction using sparse autoencoder;The improved aurora optimization algorithm is used to optimize the support vector machine, and the IPLO-SVM model is constructed to identify faults.The application can fully integrate multi-source information, efficiently extract fault features, achieve high-precision classification, and is suitable for intelligent operation and maintenance of distribution network ring network cabinet.

This invention discloses a design method for parallel current sharing of BOOST multiphase interleaved silicon carbide single transistors. It identifies key parasitic parameters by building a dual-pulse simulation platform, completes device layout in conjunction with the overall system structure, uses PCB symmetry and copper layer stacking to control parasitic parameter consistency, and forms a design closed loop through dual-pulse and steady-state thermal testing. This effectively solves the problem of poor current sharing in parallel silicon carbide single transistors. Furthermore, this method ensures balanced current distribution during switching transients and conduction steady states, eliminates current sharing failures caused by parasitic parameter mismatch, fully utilizes the performance of silicon carbide single transistors without requiring amplification device margins, flexibly adapts to the overall system layout, improves space utilization, optimizes system efficiency, reduces design costs and redundancy, and achieves a reliable, efficient, and highly adaptable design for parallel current sharing of BOOST multiphase interleaved silicon carbide single transistors.

The application belongs to the technical field of turbine component transient state test, and particularly relates to a turbine component transient state test inlet environment simulation evaluation method. Time is taken as a reference, interpolation method is used to calculate corresponding values of discrete points of turbine inlet environment parameters in the whole machine environment transient state, and then the deviation is calculated, and the maximum deviation is taken to evaluate the turbine component transient state test inlet environment simulation. The turbine component transient state test inlet environment simulation can be efficiently and reliably evaluated, and the effective development of the turbine component transient state test is promoted.

This invention relates to the field of power electronic converter control technology and discloses a method and apparatus for judging the transient stability of a hybrid system with a grid-connected converter. The method includes constructing an equivalent model of the hybrid system comprising a grid-connected converter and a network-connected converter, wherein a virtual impedance is connected in series in the branch of the network-connected converter; constructing a Lyapunov energy function based on the equivalent model, wherein the independent variables include the power angle and phase-locked loop frequency of the grid-connected converter, and the power angle, frequency, and voltage amplitude of the network-connected converter; determining the stability domain boundary of the hybrid system using the Lassel invariant set principle when the derivative of the energy function with respect to time is less than or equal to 0; calculating the critical range of the virtual impedance based on the changing trend of the stability domain boundary, and determining the target value of the virtual impedance to maintain the transient stability of the hybrid system. The above method achieves quantitative judgment and parameter tuning of the transient stability of the hybrid system.

The application discloses a kind of flexible direct current transmission line fault transient electrical quantity determination methods, comprising: according to the circuit parameter of MMC converter station, construct MMC equivalent circuit when inter-pole short circuit;According to the transmission line parameter obtained, establish the equivalent model of two-port of direct current transmission line under complex frequency domain;According to the equivalent circuit of MMC when inter-pole short circuit and the equivalent model of two-port of direct current transmission line, obtain the expression of direct current fault transient under complex frequency domain;The expression of direct current fault transient under complex frequency domain is carried out Laplace transformation to obtain time domain response, the whole trend of transient process after fault can be given more accurately by the application.The calculation process is simple, avoids the complicated modeling simulation process in traditional simulation method.Meanwhile, it can well reflect the occurrence wave process when overhead line fails.The method can accurately express the overall development trend of the fault current flowing through the protection installation before the converter station is locked after the fault occurs, and has a positive significance for the fault current suppression and protection setting design of MMC-HVDC system.

The application discloses a wind farm line fault positioning method and device, a storage medium and an electronic device. The method comprises the following steps: acquiring transient zero sequence voltage signal data sets of bus terminals and terminal ends of each power collection line within a preset time range after a line fault occurs in a wind farm; performing power collection line selection processing based on the transient zero sequence voltage signal data sets, and obtaining a target power collection line where the fault occurs; constructing a power collection line branch selection matrix based on estimated distances from estimated fault points of each branch of the target power collection line to intersection points of the branch and the power collection line; performing selection processing on the transient zero sequence voltage signal data sets of the bus terminals and the terminal ends of the target power collection line by using the power collection line branch selection matrix, and obtaining a target branch of the target power collection line where the fault occurs, so as to obtain a target fault position of the target branch. The application can realize fault positioning of the wind farm by using fewer traveling wave recorders, thereby saving the cost of fault positioning of the wind farm.

The present application belongs to the technical field of grid-forming converter control, in order to solve the problem that the existing control strategy is difficult to balance the transient stability and grid support capability, a hybrid synchronization control method and system considering transient stability and grid support are proposed, when the grid-forming converter is detected to have transient instability risk, a grid-following control branch based on a first-order phase-locked loop is introduced in parallel on the basis of the original grid-forming virtual synchronous machine control loop; in the initial stage of the fault, by adjusting the gain proportional coefficient, the equivalent active power reference value is reduced to zero, so as to block the active power injection and minimize the acceleration area; after a preset initial time period, by dynamic adjustment, the equivalent active power reference value tracks the current electromagnetic power in real time, while continuing to suppress the power angle oscillation, the grid support capability of the converter is effectively restored.

This application discloses a transient stability control method, device, terminal, and medium for a grid-connected converter. The method utilizes internal information such as the three-phase output current at the grid connection point and the converter's frequency deviation to achieve rapid determination of the grid connection status and timely triggering of transient stability control logic. This method avoids dependence on external grid voltage and line impedance information, effectively overcoming the problem of low control efficiency caused by communication efficiency limitations in traditional control methods. Therefore, it improves the transient stability control efficiency and response speed of the grid-connected converter under grid fault conditions, ensuring transient stability under grid fault conditions.

This invention relates to the field of power electronic equipment control technology and discloses a method, apparatus, storage medium, and computer equipment for phase jump fault ride-through. The method includes calculating the power angle difference between the system power angle and the rated power angle of the target grid-type inverter and comparing it with a difference threshold; when a phase jump fault occurs, determining the corresponding power angle compensation value based on the rated power angle and the fault power angle under fault conditions; freezing the active power loop of the target grid-type inverter and applying the power angle compensation value to the output side of the active power loop; and when a current instantaneous value is detected to exceed a preset current threshold, limiting the reference current of the current inner loop of the target grid-type inverter. This method introduces power angle-based adaptive compensation and current limiting into the control loop, has a simple structure, requires no complex parameters, effectively addresses overcurrent and instability problems caused by phase jump faults, and improves system transient stability and fault ride-through capability.