47 results about "Steady state simulation" patented technology

The invention discloses a building indoor environment optimization method based on the model order reduction technology. The method mainly includes the three steps: (1) using CFD (computational fluid dynamics) software for steady-state simulation of the indoor environment, and constructing variation spaces of various environmental parameters; 2) reconstructing low-order parameter variation subspaces by the aid of the POD (proper orthogonal decomposition) technology; and 3) searching the optimal air conditioner air supply temperature and the optimal air conditioner air supply speed by operating the genetic algorithm. The variation subspaces of the indoor environmental parameters are constructed by the aid of the POD technology, so that influences of spatial distribution on the environmental parameters are considered fully in an optimizing strategy, and optimization accuracy is improved. The POD model order reduction method maps a control equation in an original space into one orthogonal subspace, and accordingly mapping error can be guaranteed to minimum in the energy sense. Besides, compared with a present environment optimization strategy, the building indoor environment optimization method based on the model order reduction technology has the advantages of high optimization precision, high speed and the like.

The invention discloses a dispatcher training simulation system based on a real-time simulator and a construction method. The dispatcher training simulation system includes a mirror image energy management subsystem, a dispatcher training simulation subsystem and a real-time simulator subsystem. The mirror energy management subsystem performs grid graphs, models, databases and real-time data synchronization in real time with an energy management system running in a dispatching center through a cross-site synchronization method; the dispatcher training simulation subsystem maps a power grid model to an RTDS grid model for teaching plan management, information exchange and comparative analysis; and the real-time simulator subsystem receives the control instructions issued by the dispatcher training simulation subsystem, and uploads transient steady-state simulation data to the dispatcher training simulation subsystem. The system improves the simulation accuracy of dispatcher training, achieves the requirement of a dispatcher understanding the power system transient change process, and improves the accident handling capacity of the dispatcher.

The invention discloses a heat-work conversion and dispatching optimization decision-making assisting system and a heat-work conversion and dispatching optimization decision-making assisting method for a complementary DMG (distributed multi-generation) system. The heat-work conversion and dispatching optimization decision-making assisting system comprises a fuel characteristic parameter module, a combustion adjustment experimental module, a reference pattern module, a heat balance and consumption quantity computing module, a combustion condition adjustment and management module, a heat-work conversion management module, a variable-working-condition signal transmission module, a full-working-condition operation parameter management module, a district cooling network circulation mode module, an energy efficiency and environmental benefit evaluation module and a dispatching optimization and decision-making assisting management module. The heat-work conversion and dispatching optimization decision-making assisting system and the heat-work conversion and dispatching optimization decision-making assisting method have the advantages that district cooling network circulation match is achieved flexibly for a multi-heat-source system different in temperature to construct the complementary DMG system with multi-energy-source input and multi-product output, and high flexibility and advancement are achieved; an advanced system for process engineering is applied to production device design, steady-state simulation and optimization, sensitivity analysis and economic evaluation of a whole process of the complementary DMG system, so that accurate and timely dispatching optimization and decision-making assisting are achieved.

The invention provides a control simulation method for a wastewater treatment process. The data base of the wastewater treatment process is established through a parameter sensor and the data collection system of the wastewater treatment process. Firstly, 100 to 150 days of open loop stead simulation is executed using a data file. Secondly, the entry data file of clear weather is used as dynamic input and 14 days of closed loop control simulation is executed to the system on the circumstance of no interference. Then three entry wastewater data files in the data base of the wastewater treatment process are used and 14 days of respective control simulation is continued. Finally, the control result is evaluated using the closed loop control simulation result of the 21st day to the 28th day in the data base. The invention simulates the wastewater treatment process and establishes a corresponding data base. Various automatic control proposals are simulated and the proposal control effect is inspected according to an appointed evaluation standard, so a relatively excellent control proposal is obtained. The water quality is improved and the treatment energy consumption is reduced. The consumer simulation interface is friendly, which facilitates the research and development of the control proposal.

The invention discloses a flexible direct-current electronic transformer analogue simulation system. The system comprises a fault inversion module, obtaining fault recording according to preset waveform file, and reproducing fault recording; a steady-state simulation module, simulating a steady-state output waveform of the mutual inductor according to a preset function library and adjusting the steady-state output waveform of the mutual inductor; a transient simulation module, simulating the transient output waveform of the mutual inductor according to a preset function library, and adjustingthe transient output waveform of the mutual inductor; an exception simulation module simulating an exception output waveform of the mutual inductor according to a preset function library, wherein theexception output waveform comprises a frame loss rate and delay time; a trigger module triggering the fault inversion module, the steady-state simulation module, the transient simulation module and the abnormal simulation module. The technical problems that in the prior art, when regular checking is carried out on a flexible direct-current transmission control protection system, the requirements of various different working conditions cannot be met, especially verification data are provided for countermeasures, and transformer output waveforms under normal working conditions are provided are solved.

The invention discloses a sewage treatment optimal control method with carbon source addition, and belongs to the technical field of biological wastewater treatment. The method comprises the steps that 1, an added dynamics expression is written into simulation software containing an ASM2d model, an ASM2e model is constructed on the basis of the ASM2d model; 2, various technological assembly units in an ASM2e model base are used for constructing the sewage treatment technology; 3, the concentration of inflow water quality is converted into the component concentration of the ASM2e model, and preliminary steady state simulation is performed on the sewage treatment technology; 4, according to the preliminary steady state simulation result and sensitivity analysis, dynamics parameters and chemometrics parameters of the ASM2e are calibrated, and steady state simulation is achieved; 5, the steady state simulation result is adopted as an initial input value of dynamic simulation, and the dynamic inflow water quality is dynamically simulated and analyzed. The method is suitable for nitrogen and phosphorus removal effect simulation and optimal operation of a sewage treatment system in an anoxia or aerobic zone with sodium acetate.

The invention discloses a sewage treatment optimized simulation method with an ethanol-like substance as an external carbon source and belongs to the technical field of wastewater biological treatment. The method comprises the following steps: S1, writing an added dynamic expression into simulation software containing an ASM2d model, and constructing an ASM2g model by combining the ASM2d model; S2, constructing a sewage treatment technology by utilizing all the technological component units in an ASM2g model library; S3, converting concentration of inflow water into component concentration ofthe ASM2g model, and carrying out primary steady-state simulation on the sewage treatment technology; S4, calibrating dynamic parameters and chemometric parameters of the ASM2g model according to results of primary steady-state simulation as well as sensitivity analysis, and performing steady-state simulation; and S5, with a steady-state simulation result as an initial input value of dynamic simulation, carrying out dynamic simulation analysis on dynamic inflow water quality. The method disclosed by the invention is applicable to simulation of nitrogen and phosphorous removal effect and optimized operation of a sewage treatment system containing ethanol-like substances.

An apparatus and method are disclosed for modeling at least a portion of a rolling tire (200). A finite element model of at least a portion of a tire (200) rolling against a tire contacting surface (202, 506, 602) is input into a finite element analysis system (100). The system executed instructions that result in the application of a constant force to the model tire (200) or portion thereof by the tire contacting surface (202, 506, 602). The application of force control boundary conditions, as opposed to displacement control, provides significant benefit in terms of computational time of the finite element analysis solution. A finite element analysis simulation of the model against the tire contacting surface (202, 506, 602) is performed while maintaining the force on the model tire (200). Alternatively, a camber (gamma) is also applied to the tire and maintained throughout the simulation.

In a circuit simulation tool in a computer system having one or more computer processors and computer-readable storage, a method for characterizing a driven oscillator circuit having an oscillator coupled to a time-varying input signal includes retrieving information provided in a circuit description of the oscillator circuit. The method also includes forming a frequency-domain harmonic balance equation for the oscillator circuit using the retrieved information provided in the circuit description of the oscillator circuit. The harmonic balance equation includes a first differential operator in a frequency domain of the input signal and a product of a differential operator in a second frequency domain of the oscillator and a frequency variable of the oscillator. The frequency variable is independent of the frequency domain of the input signal. The method further includes solving the harmonic balance equation to obtain a waveform description of the oscillator circuit.

The invention relates to a method for constructing an agent model of a steady-state simulation result of a sewage treatment dynamic model by utilizing a Kriging interpolation method. According to themethod, after the input variable of the sample is measured, the output value of the steady-state simulation result can be accurately predicted. The method comprises the following steps: 1) setting a sampling strategy and obtaining a training sample and a prediction sample; 2) performing steady-state simulation according to the sewage treatment dynamic model, and recording a result; 3) fitting thetraining sample according to a Kriging interpolation method optimized by a PSO algorithm, and generating a prediction value for verifying steady-state output of the sample; and 4) comparing the difference between the predicted value and the real value, and increasing the number of the training samples to repeat the above operations when the difference is greater than a set threshold. According tothe method, the agent model can be adaptively established according to the to-be-tested sample, and when the real input sample is collected, the result of steady-state simulation can be accurately andquickly predicted, and the calculation amount is greatly reduced.

The invention provides a coordination control technical design scheme for improving the complex fault ride-through capability of an offshore wind power flexible multi-terminal collection system. The scheme comprises the following steps: 1) a steady-state simulation verification control strategy: determining a basic control strategy mentioned in the invention, thereby enabling a multi-terminal network to operate normally and safely in a steady state; 2) verifying the feasibility of the scheme by implementing faults on the master station power grid, the slave station power grid and the wind power plant, and enabling the system to operate stably when a single fault is verified; and 3) implementing complex multiple faults to verify and analyze the comprehensive complex fault ride-through coordination control strategy, and simultaneously implementing faults on the master station power grid, the slave station power grid and the wind power plant to form a complex fault environment. When the DC bus voltage drops, the system is switched to a complex fault ride-through coordination control strategy under master-slave scheduling control, and redundant power is discharged through switching operation of the hybrid DC ETO control unloading circuit, so that the purpose of stabilizing and balancing the DC bus voltage is achieved.

The invention discloses a hot steam network steady state simulation method, system and device and a medium. The method comprises the following steps: step 1): establishing a hot steam network steady state simulation model which comprises a pipe section momentum balance equation, a node mass flow balance equation, a pipe section mass flow balance equation and a pipe section energy balance equation; step 2): determining a hot steam network solving condition; step 3), determining a hot steam network solving algorithm; and 4) solving and calculating, and performing result analysis. According to the method, the model is simplified by utilizing piecewise linearization of the saturated steam property, so that the model solving speed is greatly increased while the solving accuracy is ensured; condensed water loss in the hot steam transmission process is accurately considered; and a heat dissipation loss correction coefficient is introduced, so that the accuracy of heat dissipation loss calculation is improved. According to the hot steam network steady-state simulation analysis method provided by the invention, steady-state real-time simulation of the hot steam network with high simulation precision and simulation speed can be realized.

The invention discloses a numerical simulation simplification method for resistance reduction performance of a surface microstructure of a rotating blade. Firstly, a computational domain is established according to an overall smooth impeller model, smooth impeller full-ring simulation is carried out, and parameters of a flow field around a blade are extracted. Secondly, an integral impeller computational domain is segmented, a single smooth blade computational domain is created. Periodic simulation is made and flow field parameters are extracted around the blades; parameters are compared twice, and the rationality of simplification from a whole loop to a single loop is ensured. The single-ring computational domain is sliced in the height direction to obtain a two-dimensional blade computational domain section, a computational domain of a single blade profile is created by stretching and local steady-state simulation is made by taking a single-ring simulation result as a condition. The local steady-state simulation structure is compared with theoretical calculation to ensure that an error is within an acceptable range, microtextures on the surface of the blades are arranged to perform local steady-state simulation. By means of the method, the flowing environment of a certain blade height position of the impeller system can be simulated, and the drag reduction characteristic of the microstructures at the position can be studied.

The invention discloses an automated hybrid simulation system for a distributed distribution network based on RTDS, and the system comprises a transient simulation subsystem, a steady state simulation subsystem, and a power distribution automated main station which is connected with the transient simulation subsystem and the steady state simulation subsystem. The transient simulation subsystem comprises an RTDS simulator which is used for simulating a real power distribution network, and a first power distribution terminal which is connected with the RTDS simulator. Therefore, according to the scheme of the invention, the RTDS simulator is used for building the transient simulation subsystem, and the steady state simulation subsystem is built through a steady state simulation subsystem of an intelligent power distribution network or the real power distribution network and a second power distribution terminal. The two subsystems and the power distribution automated main station jointly form the complete automated hybrid simulation system. The automated hybrid simulation system supports steady state simulation and transient simulation, also can meet the research demands of a distributed power distribution network automation system to a great extent, reduces the search cost of the distributed power distribution network automation system, and reduces the consumption time.

The invention provides a method for testing the hot spot temperature of a half-chip photovoltaic module. The method comprises the steps of S1, selecting a chip: determining battery pieces with the maximum electric leakage in the half-chip photovoltaic module; S2, selecting area: determining the worst covering area of the half-chip photovoltaic module; S3, selecting the hot spot: selecting the hotspot on each of the battery piece with the maximum electric leakage, and covering the non-hot spot area with the worst cover area; S4, exposure: connecting the positive and negative terminals of the half-chip photovoltaic module in a short-circuit manner, and putting the half-chip photovoltaic module into a steady state simulation box to exposure to determine the hot spot temperature of the half-piece photovoltaic module. The method for testing the hot spot temperature of a half-chip photovoltaic module can not only determine the worst cover area of the half-chip photovoltaic module, but alsocan quickly and easily analyze the hot spot temperature of the half-chip photovoltaic module, provides a basis for the hot spot analysis of the half-chip photovoltaic module, and facilitates the assessment of hot spot risk to improve the reliability of half-chip photovoltaic modules.

The invention belongs to the technical field of three-dimensional simulation, and particularly relates to a three-dimensional steady-state simulation matching iteration method for an aero-engine, which is characterized in that on the basis of existing three-dimensional simulation software of all parts of an engine, steady-state calculation results of all the parts are recycled, a balance equation deviation function is constructed and solved, boundary conditions of all the parts are updated, and eventually the joint work of all components is achieved. The invention aims to solve the technical problems of low matching iterative calculation precision, low efficiency, poor convergence and the like in the technical scheme of three-dimensional steady-state simulation of the whole machine, and provides an effective new method which can truly and effectively reflect the three-dimensional flow field of the engine and is suitable for engineering application.

The invention relates to a gas-liquid-solid three-phase flow simulation method, which is used for truly simulating movement tracks and deposition positions of solid particles in a hydraulic oil tank. The gas-liquid-solid three-phase flow simulation method comprises the following steps: setting simulation parameters of a liquid phase and a gas phase in FLEUNT, and performing gas-liquid two-phase steady-state simulation; setting solid phase simulation parameters in EDEM, keeping gas-liquid two-phase simulation data unchanged, switching a simulation mode to a transient state, and accessing a CFD-DEM coupling interface; and then, connecting the FLUENT and the EDEM through the coupling interface, performing gas-liquid-solid three-phase flow simulation, and ending the simulation until the simulation is in a complete steady state. The method has the advantages of being simple in parameter setting, high in accuracy, visual and understandable in simulation results, short in simulation period, high in efficiency, wide in application range, high in universality and the like.

The invention belongs to the technical field of three-dimensional simulation, and particularly relates to a three-dimensional matching iteration method for an aero-engine which is characterized in that on the basis of existing three-dimensional simulation software of all parts of the engine, steady-state calculation results of all the parts are recycled, a balance equation deviation function is constructed and solved, and boundary conditions of all the parts are updated; the invention aims to solve the technical problems of low matching iterative calculation precision, low efficiency, poor convergence and the like in the technical scheme of three-dimensional steady-state simulation of the whole machine, and provides an effective new method which can truly and effectively reflect the three-dimensional flow field of the engine and is suitable for engineering application.

The invention relates to the field of power simulation, and discloses a steady-state and transient-state offline simulation method and device for a flexible direct-current power distribution network. The method comprises the following steps: establishing a corresponding equipment offline simulation model through action characteristics of main equipment of a target flexible power distribution network, and establishing an offline steady-state simulation model and an offline transient simulation model based on the simulation model and change characteristic curves of the target flexible power distribution network under steady-state operation conditions and transient operation conditions; according to the established simulation model, setting a corresponding off-line steady state simulation plug-in and an off-line transient state simulation plug-in, and connecting the obtained plug-ins with a preset function plug-in by using the same backplane switch so as to obtain a flexible DC power distribution network steady state and transient state off-line simulation device; the off-line steady state simulation plug-in and the off-line transient state simulation plug-in can simulate transient state and steady state operation conditions of the target flexible power distribution network, and operation and maintenance personnel can perform fault drilling and operation training through the simulation device.

The invention belongs to the technical field of fluid machinery, and provides a method for predicting the performance of a centrifugal fan in a high-altitude environment, which comprises the following steps: S1, a corresponding relation equation between atmospheric pressure and altitude is established according to a high-altitude atmospheric statics theory; S2, a flow field calculation physical model of the centrifugal fan is established, and grid division is performed; s3, boundary conditions of a fan model are defined according to the atmospheric pressure value of the high-altitude area; s4, a computational fluid dynamics (CFD) method is used for conducting steady-state simulation calculation on the fan flow fields under different working conditions, and after calculation convergence, the average wind speed, pressure and impeller torque of an outlet of the fan model are output; and S5, fan performance parameters are calculated, and a centrifugal fan performance curve in the high-altitude environment is drawn. According to the method, the accuracy of predicting the performance of the centrifugal fan in the high-altitude environment can be improved, and the method has guiding significance on fan type selection and working condition adjustment in a high-altitude area.

The invention discloses a transient state and steady state hybrid simulation method and system for a power distribution network. The method comprises the following steps: dividing a transient simulation calculation area and a steady state simulation calculation area based on a state space matrix solving characteristic frequency of a power distribution network system; interacting the steady-state simulation calculation area and the transient-state simulation calculation area at intervals of each reference period, and matching a power flow value of an interface until simulation is finished; and splicing simulation results of the steady state simulation calculation area and the transient state simulation calculation area, and outputting a complete simulation result of the power distribution network information physical system. Cooperative unification of simulation of different time scales in transient simulation and steady-state simulation of the power distribution network information physical system is achieved, and the simulation calculation problem under a large-scale network can be solved.

The invention discloses a method and a device for determining a steady-state simulation wireless communication system during dynamic simulation, which solve the problem of high time consumption in determination of the steady-state simulation wireless communication system during dynamic simulation of the wireless communication system in the prior art, wherein the method disclosed by the invention comprises the following steps of: accessing at least two mobile stations into the simulation wireless communication system; determining a corresponding accessed base station of each mobile station in the simulation wireless communication system, and respectively accessing the mobile stations into the corresponding determined base stations; respectively determining downlink transmitting power of each base station accessing the mobile station to the mobile station at different appointed time points; and selecting the simulation wireless communication system corresponding to one time point from the different time points as the steady-state simulation wireless communication system according to the downlink transmitting power determined at each time point.