422 results about "Power system simulation" patented technology

According to one aspect, an apparatus for computing a solution to a power flow problem for an electrical power system comprising a plurality of buses. The apparatus includes (a) at least one processor comprising a plurality of cores; and (b) memory coupled to the at least one processor for storing an admittance matrix for the power system, real power and reactive power for each bus, and an initial complex voltage for each bus; (c) wherein the at least one processor is configured to: (i) perform a Jacobi power flow calculation for each bus to determine the complex voltage for each bus, the Jacobi power flow calculation using the admittance matrix, the real power and reactive power for each bus, and the initial complex voltage for each bus as inputs, wherein at least two Jacobi power flow calculations are performed concurrently on the plurality of cores; (ii) calculate a power mismatch at each bus based on the complex voltages; and (iii) determine whether the Jacobi power flow calculations have converged based on the power mismatch and repeat (i) to (iii) if the Jacobi power flow calculations have not converged.

The invention provides a power system three-dimensional device scene modeling method which comprises the following steps: establishing all sorts of three-dimensional device assembly models in the three-dimensional scene by adopting the virtual technology; uploading the three-dimensional device assembly models into a three-dimensional assembly library through a client side; accessing to a server side through the client side, and acquiring the three-dimensional device assembly models needed by the three-dimensional scene modeling from the three-dimensional assembly library; building a three-dimensional device scene model by adopting the three-dimensional device assembly models; guiding the built three-dimensional device scene model into a power system simulating system, and carrying out simulating training and visual display or virtual test. Because the modeling process comprises the assembly modeling stage and the scene assembling stage, the scene modeling difficulty is reduced, the scene modeling efficiency is improved, the models have high reusability, particularly the team can carry out modeling cooperatively, the position of the device assembly is accurate in the virtual scene, the later maintenance workload is low, and the later maintenance process is simple and not difficult.

The invention belongs to the field of simulation and computational analysis on power systems, particularly relating to a method for splicing and integrating models in a real-time simulation system of a large power system. The method is characterized in that the online calculating data of an intranet is reserved completely, an extranet is supplemented with offline data, and through integrating an offline model (which is not consistent in time and space) with online data, integrated data which is complete in modeling and consistent with the actual conditions of the power system can be provided in seconds or minutes. The method comprises the following steps: firstly, splicing and checking the online data, and carrying out grandstream verification on the online data so as to judge whether the online data is available; then, on the basis of intelligently setting up an online/offline data mapping table, supplementing the equivalent part of the extranet in the online data with the corresponding offline data; and finally, after adjusting the boundary connection and boundary grandstream, carrying out topology analysis and grandstream calculation on the whole network, thereby obtaining a model which can be used for the calculation of a large real-time simulation system.

The invention relates to the field of power system simulation training, and particularly to a three-dimensional intelligent-station scene simulation system based on dynamic generation of Unity and a realization method. The system includes a simulation system resource file library, a simulation system configuration file library, a three-dimensional simulation model, a protection data configurationfile, a three-dimensional scene simulation supporting platform and a real-time database, a protection calculation program, a three-dimensional communication service transponder, a three-dimensional simulation system Unity scene and a three-dimensional simulation human-machine interface. According to the system, a *.unity scene file can be dynamically generated, and the problem of related work of needing to rebuild a scene environment after every time of replacing a basic model is solved. The system has good self-adaptive ability, and can compare all existing models in a model library and a newly added model, which needs to be placed in an actual scene, according to equipment machine accounts and other pre-input data information, send a result after comparison to the calculation program, and dynamically generate the new model.

The invention discloses a smart grid dispatching control system regulation and control integrated join simulation training system. The smart grid dispatching control system regulation and control integrated join simulation training system relates to a simulation training system. For the problems that training of dispatchers and monitors breaks away from actual situations, training quality is not ideal, regulation and control service level cannot be improved effectively, and safe, reliable, economical and efficient operation of a power grid is influenced in the prior art, the invention provides such smart grid dispatching control system regulation and control integrated join simulation training system, which comprises a dispatcher training simulation subsystem for dispatcher training simulation, and a monitor training simulation subsystem for monitor training simulation. The dispatcher training simulation subsystem and the monitor training simulation subsystem respectively comprise a power system simulation module, a regulation and control center simulation module and a teacher system module. The monitor training simulation subsystem shares a part of modules of the dispatcher training simulation subsystem. The technical scheme can improve professional skill training efficiency of the power grid monitors and dispatchers, reduce training period and improve training quality, so that a high-quality staff team can be developed within a short time, and safe, reliable, economical and efficient operation of the power grid is ensured.

The invention discloses an experimental platform used for simulation and diagnosis of working conditions of a shipping power system and based on an intelligent engine room. The experimental platform is mainly composed of a shipping power system simulation experiment platform frame, a datum monitoring and failure diagnosis platform body (5) installed on the experiment platform frame and an oil liquid on-line monitoring module (6) connected with the datum monitoring and failure diagnosis platform body (5) through signal lines. The oil liquid on-line monitoring module (6) is connected into a pipeline lubrication system of the experimental platform in parallel. According to the experimental platform used for simulation and diagnosis of the working conditions of the shipping power system and based on the intelligent engine room, simulation of different working conditions of the shipping power system can be achieved, and torque monitoring, vibration monitoring and shaft power monitoring of the shipping power system and a shaft system as well as on-line monitoring of states of lubricating oil and hydraulic oil under different working conditions can be achieved; by combining an intelligent machine learning method, under supporting of a great number of monitoring data, failure diagnosis and state evaluation of the shipping power system under an intelligent engine room framework are achieved; and the experimental platform can be used as a target platform of an intelligent on-line monitoring and diagnosis system.

The invention discloses a method for modeling an automatic power generating control model in power system stimulation, which models an automatic power generating control system by considering the control mode and the control performance evaluation standards in the automatic power generating control and the algorithm characteristics of power system stimulation. Meanwhile the invention discloses a method for implementing an automatic power control model in power system stimulation. The model can stimulate the three modes of constant-frequency control, constant-exchange power control and tie-line power and frequency deviation control in automatic power generating control, and simultaneously achieves the three control performance evaluation standards of A1/A2, CPS1/CPS2 and T of automatic power generating control; regions adopt different control strategies according to different region control performance evaluation standards, so that the model can analyze the influence of automatic power generating control in the long-term dynamic stimulation in a power system, and the requirement of the simulation of of the whole process of electromechanical transient and electromechanical medium and long-term dynamic state of the power system are met.

The invention relates to a non-invasive online load decomposition device, and belongs to the technical field of load decomposition of a power system. The load decomposition device provided by the invention comprises a data collection module, a load decomposition module, a communication module and an interaction interface module, wherein various modules are packaged in a modular manner; an output end of the data collection module is connected with the load decomposition module; and the load decomposition module is used for communicating with a data terminal of an electric power company through the interaction interface module, and is used for transmitting electricity information of a user to the electric power company, simultaneously receiving the latest updated electricity information database pushed by power, updating a local database conforming to the decomposition module and improving the recognition accuracy on an electrical appliance with the latest model. The non-invasive online load decomposition device is conducive to further understanding of the composition of a user load by the electric power company and strengthening of load side management; and meanwhile, the non-invasive online load decomposition device is conducive to penetrating and refining power monitoring into main electric equipment in the load, so that relatively accurate data are provided for simulation analysis and systematic planning of the power system.

The invention provides a feature value analysis system for small-interference stability of a large-scale power system, and belongs to the technical field of power system simulation and analysis. The feature value analysis system comprises a BPA data interface module for achieving seamless read-write operation of a BPA data file, a sparse matrix calculation module for achieving relevant sparse matrix processing in small-interference stability feature value analysis, a power flow calculation module, a system modeling and linearization module, a state matrix calculation module, an all feature value calculation engine module, a partial feature value calculation engine module and an oscillation mode extraction and analysis module. Omni-bearing and missing-free feature value simulation analysis for small-interference stability of an actual large-scale power grid is achieved by the adoption of TTQRE and IRAM and JDM with multiple calculation schemes.

The invention discloses a method for modeling a power load based on a measurement-based method. The method sequentially comprises the following steps of (1) preprocessing recording data to obtain data required by load modeling; (2) performing damped least-squares iterative equation solving on the preprocessed data required by the load modeling to obtain optimal load model parameters; (3) establishing an optimal load model by adopting the load model parameters; and (4) checking the obtained load model parameters, and verifying a load model with practical values comprising higher extrapolation capability, higher interpolation capability and higher capability in the comprehensive description of different load compositions to be the optimal load model. According to the method, the modeling cost is reduced; and the load model is more consistent with the actual condition of a field, high simulation accuracy and credibility are ensured, contrary conclusions under a clinical condition are completely avoided, the load model can be coordinated with the conventional power generation and distribution model, and the analysis of a power system is accurate and credible, so that the simulation analysis accuracy and credibility of the power system are remarkably improved.

The invention discloses a source-network cooperative combination real-time simulation system and an experimental method, and belongs to the field of electric system simulation and control. The source-network cooperative combination real-time simulation system comprises a source side real-time simulation sub system and a network side real-time simulation sub system, the source side real-time simulation sub system comprises a data interface server, a coordinate server, a core switch and a simulation server cluster, and a source side full range simulation model with three thermal power generating units, six hydroelectric generating sets and seven wind power plants is established. The network side real-time simulation sub system comprises a GTFPGA communication card, a PB5 board card and an RTDS real-time simulator, and a regional power grid real-time simulation model is established. The two sub systems are in hardware connection in an SFP photoelectric transmitting and receiving interface mode, and carry out optical communication based on an Aurora protocol. The real-time simulation and control system can simulate various power grid faults and various generator set faults effectively, and can achieve load optimized scheduling among regional power grids and various power plants, operation is simple and convenient, and work stability is good.

The invention provides an impact load modelling system and a method on the basis of practical measurement, belonging to the measurement and identification technique field of impact characteristic load modelling of modern power system; the system comprises six parts: a micro-computer typed impact load dynamic characteristic recording instrument, an impact load modelling platform, a remote management system, an impact load surveying information platform, a background analysis software system and a power system simulation software interface; the technical proposal of the invention is that digital data collecting, processing, managing and exchanging system which uses computer technique as core is combined with the practical production; a load model which can describe the impact load characteristic is established by the impact load modelling platform; the established impact load model is applied to the digital simulation analysis of power system by the interface of the power system simulation software.

The invention belongs to the field of power system simulation and particularly relates to a method for simulating a three-dimensional electric field on a valve side of a converter transformer. For an existing situation that the researches on the electric field of the converter transformer most focus on two-dimensional electric field modeling analysis and rarely focus on three-dimensional modeling analysis, the invention takes the building of a three-dimensional model of major insulation of the converter transformer as a core and proposes a method for simulating a direct-current electric field of a valve side winding of the converter transformer by considering the nonlinearity and anisotropy of a material. The method comprises the steps of firstly, building the three-dimensional model of the end part of the winding of the converter transformer by utilizing finite element analysis software ANSYS, and performing grid division on the three-dimensional model; secondly, writing a nonlinear anisotropic direct-current electric field computing program by utilizing a secondary development APDL module of ANSYS; and finally, setting a boundary condition, initial resistivity and a loading test voltage, and computing the three-dimensional electric field. According to the method for simulating the three-dimensional electric field on the valve side of the converter transformer by considering the nonlinearity and anisotropy, provided by the invention, a method is provided for improving the precision of simulating the electric field of the converter transformer.

The invention provides a grid simulation real-time parallel computing platform based on MPI (Multi Point Interface), belonging to the power system simulation field. Based on inducing a real-time operation system RTLinux, the invention provides a method for constructing the grid simulation real-time parallel computing platform through modifying an upper layer grid simulation computing application module, an MPICH parallel environment and GM software in real time, so that real-time parallel simulation computing with strict step length is provided for a large-scale power system, the frequency and the amplitude of step length time jitter are reduced, and faster-than-real-time and hard real-time dynamic simulation to the power system is ensured.

The invention discloses a transverse time axis clustering method in generalized load modeling on the basis of time periods. According to the method, root bus data formed by wind power and loads of the whole year are obtained; the data are processed, all the processed data are connected end to end, the data in rows form the transverse continuous data which are divided into M sections according to transverse time units THN, and all the data are transversely clustered; based on the transverse cluster result, a sample data source to be analyzed is divided into q transverse classes, and each class is represented by the respective clustering center; feature vectors are intersected and matched. The classes to which samples belong are judged through intersecting and matching of the feature vectors, generalized load modeling is utilized for setting up an accurate model and testing the effectiveness of the clustering strategy, and the simulation result shows that generalized load modeling carried out after clustering analysis makes the model practical on the basis of meeting the requirement for accuracy, and is beneficial for improving the simulation accuracy and the simulation effectiveness of an electrical power system.

A method to simulate a circuit includes receiving at least one circuit requirement and at least one Modular Multilevel Converter (MMC) parameter; determining an operating mode and switching states of an arm circuit; determining each capacitor current based on the switching states and an arm current; determining capacitor voltage and arm voltage; and generating an equivalent circuit model to simulate MMC-based HVDC systems and DC grids in a hybrid AC and DC power system.

The invention provides an oscillatory-wave-based simulation system for detecting and positioning partial discharge of a cable. The oscillatory-wave-based simulation system comprises a tested cable, a high-frequency coupler, an oscillatory wave circuit, a control module and a display module, wherein a defect point is arranged on the tested cable; the control module outputs a control signal to control the oscillatory wave circuit to produce oscillatory wave voltage; the oscillatory wave circuit outputs the oscillatory wave voltage to the tested cable connected in series with the oscillatory wave circuit, and the oscillatory wave voltage excites a partial discharge signal at the defect point; the high-frequency coupler is connected with a first endpoint of the tested cable and used for receiving the partial discharge signal; the control module positions the defect point according to the received partial discharge signal; and the display module displays the positioning result. The oscillatory-wave-based simulation system is low in simulation cost and high in efficiency, can be used for experiments and trainings in a power system simulation platform, and is suitable for popularization.

The invention provides a comprehensive load model modeling method considering load low voltage release features. Feature parameters such as critical voltage when large-amount load removing is started, the time delay of the time when the voltage falls to the critical voltage and the time when the large-amount load removing is started, and the proportion of the loads with low-voltage protection in total loads are introduced into an existing comprehensive load model considering a power grid to describe disturbance middle load low voltage release features. By the model, the defect that a traditional dynamic load model cannot describe the load low voltage release features is overcome, and accuracy and credibility of power system simulation calculation are increased.

The invention discloses a generator simulation parameters calibrating method by using a measured trajectory and the trajectory sensitivity, and the method mainly aims at the status quo that certain parameters of the generator is difficult to be obtained through the delivery test, and the parameters identification can not get rid of the limitation of the power system simulation model and parameters, furthermore, can not obtain the generator simulation parameters online. The generator parameters sensitivity to the simulation trajectory can be obtained through estimating the error between the measured trajectory and simulation trajectory, and the trajectory sensitivity is sequenced so as to determine the simulation parameter set which greatly affects the measured trajectory, the rectifiable parameters can be optimized and rectified by using the optimization method, thereby obtaining the generator simulation parameters which make the measured trajectory conform to the simulation trajectory. The method avoids the dependence on the model in traditional generator parameter identification method, has simple calculation and online application potential, and can be applied to other component simulation parameter calibration in the power system.

The invention relates to a test platform and a test method for a power dispatching automatic master station system. A supporting layer, a power system simulation layer, a dispatching automatic system simulation layer, a test verification layer and an interface adapting layer are organically integrated into the test platform, so that a set of standard test environment configuration is provided, and test items including source code test, control software closed-loop test, power system avalanche test, protocol test and the like can be provided for the dispatching automatic master station system. The creation of the test platform for the dispatching automatic master station system effectively integrates various test verification resources, and the test platform realizes standard and automatic test on tested objects. The tested system or functional module is connected to the test verification platform in a mode of 'plug and play', so that the debugging time for connecting the tested system to the test system is reduced, the test resource utilization efficiency and the working efficiency are improved, and the automation level of the test work is improved.

This invention provides a real load module establishing system, which comprises load module establishing system, micro machine load dynamic characteristic recorder, load module establishing plat, remote management system, background analysis software system and power system artificial software interface. Its detail project is as the following: to adopt the digit collection, process, management and exchanging system centered as computer technique; the micro load dynamic characteristics recorder main functions are accomplished by software; the hardware system comprises CPU, BIOS device, data buffer, memory device and human to machine dialogue device and communication device.

The invention discloses a simulating method for an electric power system. The simulating method comprises the following steps: establishing an electromagnetic transient model for each load in the electric power system; performing load flow calculation on the electric power system; allocating the electromagnetic transient models for all loads in the electric power system to a plurality of calculating nodes of a parallel computer and detecting whether the electric power system has disturbance; and after the disturbance occurs, performing parallel electromagnetic transient simulation on each electromagnetic transient model in the electric power system and performing electromechanical transient simulation on the electric power system at next electromechanical transient moment by utilizing an electromagnetic transient simulation result, thereby obtaining an electric quantity parameter of the electric power system after disturbance. Compared with the prior art, the simulating method provided by the invention has the advantages that the accurate electromagnetic transient model is introduced into the electromechanical transient simulation, the calculation accuracy is effectively improved,and each electromagnetic transient model is allocated into each node of the parallel computer, thereby fully utilizing the characteristics of parallel calculation, greatly promoting the calculation efficiency and efficiently promoting the calculation accuracy.

The invention relates to the technical field of the electrified railway, in particular to an electric energy quality evaluation method of an electrified railway accessed power system. The electric energy quality evaluation method adopts the following technical scheme: (1) the invention aims at obtaining a negative sequence computing method which is suitable for building single-phase load simulation of the electrified railway in power system simulation software (PSD) which is generally used in power systems, and (2) the invention aims at obtaining a method that is used for calculating the current value, which is allowed to be injected in the electrified railway by a point of common coupling, of the harmonic wave at each order in the power system in which the electrified railway traction station is accessed by way of T-type wiring. In the invention, system evaluation simulation calculation is carried out on the related problems of the electric energy quality of the electrified railway, the analysis and evaluation of related problems of the electric energy quality are provided, so as to give guiding suggestions to the design, compensation and fixed value selection and the like of theelectrified railway and the corresponding power supply system.

The invention provides an assistant decision-making method for fast branch overloads in plan security check, which belongs to the field of plan security check in the simulation analysis and calculation of power systems. The method comprises the following steps: aiming at the overload situations of lines and transformers in ground-state power flow analysis or static security analysis, calculating active power shift distribution factors of each power generator and load to a branch through using the steady-state data of a power grid and adopting a direct-current power flow method; through adopting a practical calculation formula, calculating power generation and load quantities required to be regulated for overload elimination; and then, sequentially regulating an output and a load according to the power shift distribution factors, and carrying out power flow check so as to achieve the purpose of overload elimination. According to the invention, assistant decision-making information can be provided for branch overload situations occurring in ground-state power flow analysis or static security analysis, therefore, the method is applicable to an online security assessment system and a plan security check system, and also applicable to an offline-mode calculation, and can greatly improve the intelligentization and automation levels of the simulation analysis and calculation of power systems.

The invention relates to the technical field of power system simulation, in particular to a nuclear power unit simulation model comprising a power control system. The model concretely includes a reactor core module, a coolant pipe module, a steam generator module, a steam turbine module, a governor module, a reactor power control system and a primary loop average temperature module. The coolant pipe module comprises a cold wire temperature unit and a hot wire temperature unit. The reactor power control system comprises a coolant average temperature control system module and a power control system module. The model includes a coolant average temperature control system module and a power control system module, can realize the coarse and fine adjustment of the reactor power of the nuclear power unit, corresponds to the power compensation bar group control system and the temperature regulation bar group control system of the nuclear power unit operating in G mode respectively, and verifiesthat the simulation model of the nuclear power unit operating in G mode has a certain ability of following the load.

The invention relates to an electric system load multi-agent control method based on Matlab and Netlogo. A brand-new design thought is adopted, a Matlab and Netlogo combined simulation platform is based, load-electrovalence responding character models are established, a load strategy set is established through the target tendency degree of a target corresponding to loads, a strategy of loads corresponding to the maximum total objective function value is acquired, real-time optimal control over load multi-agents in an electric system is achieved, the load control problem in an existing electric system can be effectively solved, and the electric system load multi-agent control method based on Matlab and Netlogo has the advantages that the calculation speed and the convergence performance are high; the variability of the agents can be controlled, disturbance of the outside can be responded, and positive reaction can be made; compared with a simulation system of the original electric system, the simulation process is visual and visible, and the state change situations of all intelligent element modules can be seen very clearly in Netlogo in the whole process.

The invention discloses a method for checking short-circuit current resistance of a high-voltage circuit breaker. The method comprises the steps of: firstly, acquiring a short-circuit current value of the circuit breaker by adopting a power system simulation program for calculation or according to wave recording and acquisition; secondly, adopting an envelope curve method to obtain a DC component in a short-circuit current; thirdly, adopting an exponential fitting method to calculate an attenuation time constant of the DC component of the short-circuit current; and finally, judging whether short-circuit current switching-on/off abilities of the circuit breaker are inadequate through comparing whether the attenuation time constant exceeds a range specified by ''High-voltage AC Circuit Breaker''. Through comparing a difference between the time constant of the DC component of the short-circuit current of the circuit breaker calculated by adopting the method and a standard time constant, whether the circuit breaker has a risk of inadequate short-circuit capacity can be determined, and necessary prevention measures can be taken in time. The method provided by the invention is suitable for checking the short-circuit current resistance of the high-voltage circuit breaker in the electric power system.

The invention belongs to the field of simulation of electric power systems, and particularly relates to a cluster classification for a wind power plant. Clusters are classified in a unit of the wind power plant according to the actually measured operating data of the wind power plant. In the process of acquiring the data, the actually measured data probably contain noise data because of the factors like the defect or the execution error of a measurement system. In order to reduce the interference of the noise data, the isolated point data in the actually measured operating data of the wind power plant are firstly processed according to the potential value of a sample point. When the central initial positions of the two clusters are nearer during the cluster classification, more redundant information is contained, and the classification result easily becomes the locally best. Aiming at the problem, a sample group with the smallest Euclidean distance moves towards the mean value point, the mean value of the moved sample group replaces the original sample group, so that the method acquires the central position of the diversified initial clusters, and the global searching ability is improved. By the adoption of the cluster classification for the wind power plant, provided by the invention, wind turbine generators having the near operating points are classified in the same cluster, and the equivalent modeling approach for the wind power plant is optimized.