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81results about How to "The calculation process is clear" patented technology
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Three-phase load flow calculation method of weak looped distribution network comprising multi-type distributed power sources
InactiveCN103066593ACalculation speedConvergent stabilitySpecial data processing applicationsAc network circuit arrangementsLoop analysisType distribution
The invention discloses a three-phase load flow calculation method of a weak looped distribution network comprising multi-type distributed power sources. Firstly, the effective three-phase load flow calculation method of a weak looped distribution network is put forward in a distribution sequencing network based on a sequence component calculation method and in combination with characteristics of the weak looped distribution network and a loop analysis of a road. Secondly, detailed formula derivation of iterative computation of distributed generation (DG) of a PQ node type, a PQ (V) node type, an OV node type and a PI node type is conducted and the easy formula is introduced into the load flow calculation method. The three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources can effectively process multi-type DG and the weak looped distribution network and is distinct in calculation procedure, simple in programming, and easy to achieve. In addition, the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources retains strong points of rapid calculation and stable convergence of a forward-back substitution method catering to branch circuits. Finally, effectiveness and good convergence of the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources is tested and verified by means of a IEEE (institute of electrical and electronic engineers)-37 generatrix test calculation case, and the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources has good ability of processing the multi-type DG and the looped network.
Owner:HOHAI UNIV
Three-phase decoupling load flow calculation method of power distribution network based on path matrix
ActiveCN102842907AAvoid calculationSmall amount of calculationSpecial data processing applicationsAc network circuit arrangementsComponent LoadLoop analysis
The invention discloses a three-phase decoupling load flow calculation method of a power distribution network based on a path matrix. The method comprises the following steps: firstly, adopting a symmetrical component method to perform sequence component decoupling on a three-phase unbalanced power distribution network to obtain zero sequence, a power distribution sequence network with positive sequence and negative sequence, and adopting a loop-analysis method based on the path matrix to perform one-phase-sequence component load flow calculation to obtain load flows of the three-sequence networks; and secondly, transforming sequence network load flows in a phase component mode by an inverse transformation principle of the symmetrical component method to obtain three-phase load flows. By using the method, a three-phase unbalanced power distribution network system is decoupled into zero sequence, positive sequence and negative sequence networks, so that large matrix manipulation in the three-phase load flow calculation is avoided, the calculated amount is decreased, and the calculation efficiency is improved. The method has the advantages of clear calculation process, simple programming and fast calculation speed. Finally, a 6-busbar test example verifies the correctness and good convergence; and the method is good in generality and practical applicability.
Owner:HOHAI UNIV
Three-phase decoupling power flow calculation method for power distribution network containing multiple transformer branches
InactiveCN102842908AFast convergenceOptimize calculation speedSpecial data processing applicationsAc network circuit arrangementsBalancing networkSymmetrical components
The invention discloses a three-phase decoupling power flow calculation method for a power distribution network containing multiple transformer branches. According to the characteristics of basically symmetrical three-phase line parameters, unbalanced three-phase load and the tree structure of the power distribution network, the method comprises the following steps: performing sequence component decoupling on the three-phase unbalanced network of the power distribution network by a symmetrical component method; in a power distribution three-sequence network model, transforming the transformer branches into the common branches by a phase transformation technology; and calculating the sequence network power flow of the power distribution system by a path matrix-based loop analysis method and transforming sequence component power flow into phase component power flow by an inverse transformation principle so as to realize three-phase decoupling power flow calculation of the three-phase unbalanced system of the power distribution network containing multiple transformer branches and reduce calculated quantity. The method is clear in calculation process, simple in programming and high in calculation speed. The correctness and high convergence property of the method are verified through 34 bus test calculation examples. The method has high generality and practicability.
Owner:HOHAI UNIV +1
Distributed generation power distribution network three-phase load flow calculation method taking phase sequence mixing method into consideration
InactiveCN103094900AStrong handlingEasy programmingAc network circuit arrangementsLoop analysisPower grid
The invention discloses a distributed generation power distribution network three-phase load flow calculation method taking a phase sequence mixing method into consideration. The distributed generation power distribution network three-phase load flow calculation method comprises the following steps that firstly, a power distribution network three-phase load model, a network phase sequence parameter model and a distributed power supply access model are built based on the phase sequence mixing method, an effective three-phase unbalance power distribution power network improved load flow calculation method is disclosed in a power distribution sequence network, and a sequence component method is fully utilized to process the advantages that a three-phase unbalance system has access to symmetrical distributed generation (DG) and PV nodes; and then PQ, PQ(V), PV and PI node type DG calculation models are deduced in detail and are induced into the discloses load flow calculation method. The distributed generation power distribution network three-phase load flow calculation method taking the phase sequence mixing method into consideration has the advantages of being clear in calculation process, simple to program, quick in calculation speed and good in convergence. Finally, the effectiveness and generality of the distributed generation power distribution network three-phase load flow calculation method are tested and verified through diffset. The distributed generation power distribution network three-phase load flow calculation method has good convergence and strong capacity of processing DG nodes and generating reactive power boundary cross.
Owner:HOHAI UNIV
Method for calculating power flow of radial power distribution network based on variable substitution
ActiveCN103065059AThe calculation process is clearCalculation speedSpecial data processing applicationsPower flowParallel computing
The invention discloses a method for calculating the power flow of a radial power distribution network based on variable substitution. The method comprises the following steps of: firstly, converting 2 / 3 of unbalance equations into linear equations in power flow calculation by using variable substitution according to the special topological structure and characteristic of the radial power distribution network, wherein the other 1 / 3 of unbalance equations are also relatively simple; then, because nonzero elements of a jacobian matrix formed by an unbalance equation set are relatively fixed, respectively calculating the invariant elements and a small number of variable elements of the jacobian matrix by using a sparse technique, wherein the invariant elements do not need to be repeatedly calculated, and a calculation formula of the variable elements is also relatively simple; and finally, carrying out iteration solving on the unbalance equation set to obtain the power flow of the system. The calculation speed and efficiency of a power flow algorithm are improved foundationally through the variable substation and the sparse technique; and the method has the characteristics of clear calculation process, easiness for programming and the like. Finally, the effectiveness and efficient calculation capability of the method are proved through a plurality of test cases.
Owner:HOHAI UNIV
Evaluation method of transformer substation grounding grids
ActiveCN104568719AThe calculation process is clearImprove accuracyWeather/light/corrosion resistanceGrounding gridElectric power system
The invention relates to an evaluation method of transformer substation grounding grids. The evaluation method comprises the following steps: (1) deriving the thinning speed of metal thickness of a grounding grid by applying the faraday's law; (2) determining the minimal section area Sg of a grounding wire without considering corrosion; (3) determining the minimal section area Sg2 when considering the influence of the corrosion factor; and (4) determining the evaluation years of the grounding grid. According to the method, the calculation process is clear, the accuracy rate is high, and the theoretically powerful support is provided for the safety running of a power system grounding grid.
Owner:STATE GRID CORP OF CHINA +1
Nonlinear intelligent predictive control technology-based super critical unit reheating steam temperature optimal control system
ActiveCN106019939ASmall fluctuation rangeThe calculation process is clearAdaptive controlFlue gasPredictive controller
The invention discloses a nonlinear intelligent predictive control technology-based super critical unit reheating steam temperature optimal control system. The control system is composed of a flue gas baffle control loop and an accident water-spraying control loop; each of the flue gas baffle control loop and the accident water-spraying control loop includes a feedback loop and a feedforward loop; according to the feedback loop of each of the two control loops, a nonlinear intelligent predictive controller is adopted as a main controller; each of the feedforward loops includes a fuzzy intelligent feedforwarder; and the input variables of the fuzzy intelligent feedforwarder include a deviation variable e and deviation change rate de / dt. According to the control system of the invention, nonlinear intelligent predictive control is adopted, so that a constrained optimization problem can be processed conveniently. The calculation process of the control system is very clear and simple. When the control system is applied to engineering application, programming is very easy to implement, and the control effect of the control system is better than that of traditional PID; and the feedforward variable is additionally adopted, so that fast adjustment of the opening degree of a flue gas baffle can be realized, the overtemperature of the metal wall of a reheater can be prevented, a control effect enabling effective control on reheating steam temperature can be realized, and the economical efficiency and security of the operation of a boiler can be ensured.
Owner:SOUTHEAST UNIV
Urban traffic health indicator system evaluation method based on complex network theory
ActiveCN110211378ASolid theoretical foundationGood for comprehensive graspDetection of traffic movementResourcesTraffic networkIndex system
The invention provides an urban traffic health indicator system evaluation method based on the complex network theory. The method mainly comprises the following steps: A: establishing a reliability indicator R of an urban traffic network; B: establishing a brittleness indicator B of the urban traffic network; C: establishing an elasticity indicator S of the urban traffic network; based on obtainedactual urban traffic operation data, importing seepage analysis to calculate the size of a functional sub-group of the urban traffic network under a given threshold, and establishing the reliabilityindicator R of the urban traffic network; mining a key road in the urban traffic network, analyzing a road set collapsing the functional sub-group of the urban traffic network to a certain proportion,and establishing the brittleness indicator B of the urban traffic network; and finally, establishing the elasticity indicator S of the urban traffic network through a whole process of generation-evolution-dissipation. The establishment of the urban traffic health indicator system can provide a support for the assessment of the actual operation state of the urban traffic, the development of targeted traffic management measures, and the improvement of the urban traffic health.
Owner:BEIHANG UNIV
Optimization method for industrial circulating water system
ActiveCN102620143AReasonable useTheoretical basis is sufficientEnergy industryPipeline systemsControl systemHeight difference
Owner:CHANGSHA HAICHUAN ENERGY SAVING TECH
Self-reduction multi-loop centralized predictive control system for reheat steam temperature of secondary reheat unit
The invention discloses a self-reduction multi-loop centralized predictive control system for reheat steam temperature of a secondary reheat unit. The system is composed of a flue gas recirculation fan rotation speed control loop and a flue gas damper opening degree control loop. The deviation of the primary reheat steam temperature and the secondary reheat steam temperature from a set value is sent to a predictive controller. The optimized values of the flue gas recirculation fan rotation speed and the flue gas damper opening degree are calculated to ensure that the primary reheat steam temperature and the secondary reheat steam temperature of the unit are maintained within a reasonable and safe range. According to the invention, predictive control is used to easily handle the optimization of a large inertia multivariable system; the calculation process is clear and simple; during engineering application, programming is easy to implement; the corresponding control amount can be adjusted in time for the prediction of future output deviation; the primary reheat steam temperature and the secondary reheat steam temperature are stable within a reasonable range, which ensures the stability and safety of the unit; and the control system has a better control effect than traditional PID control.
Owner:SOUTHEAST UNIV
Thermal power generating unit distributed coordination control system based on multi-parameter dynamic matrix control
InactiveCN107515598AThe calculation process is clearSimple calculationTotal factory controlProgramme total factory controlOptimization problemGenerating unit
The invention discloses a thermal power generating unit distributed coordination control system based on multi-parameter dynamic matrix control. The control system comprises a load control loop, a main steam pressure control loop and a separator temperature control loop, load, main steam pressure and separator temperature as well as deviation of a set value are sent to a prediction controller based on a dynamic matrix control algorithm, optimization values of steam turbine regulating valve opening degree, coal feed and water feed flow are acquired by calculation, and tracking performance of a unit to load instructions and running safety performance of the unit are ensured. The optimization problem of a multi-variable system can be processed conveniently by adopting dynamic matrix control, and the calculation process is clear and simple; during engineering application, programming is convenient to implement; corresponding control quantity is adjusted timely by predicting future output deviation, actual generating power can quickly track the load instructions, stability of the main steam pressure and the separator temperature can be ensured, and the unit is high in stability. The control scheme has control effect better than that of conventional PID control.
Owner:SOUTHEAST UNIV
Installation method of stay cable of cable-stayed bridge reduced-scale test model
ActiveCN110700072AThe calculation process is concise and clearTension steps are clearGeometric CADCable-stayed bridgeStructural engineeringArchitectural engineering
The embodiment of the invention discloses an installation method of a stay cable of a cable-stayed bridge reduced-scale test model. The method comprises the steps of building a cable-stayed bridge reduced-scale finite element model and a stay-cable-free cable-stayed bridge reduced-scale test model according to the bridge parameters; obtaining the cable force tension value of each stay cable in a cable-stayed bridge according to the bridge forming state requirement of the cable-stayed bridge and the reduced-scale finite element model of the cable-stayed bridge; and installing the stay cables according to the cable-stayed bridge reduced scale test model without the stay cable and the cable force tension values. The method is not limited to a single expected value, different design requirements can be met, the calculation process is concise and clear, the tensioning steps are clear, only the tension information of one cable needs to be paid attention to each time of tensioning, and the complex step that overall optimization cable adjustment is conducted after all stay cables are tensioned, is avoided.
Owner:CHINA UNIV OF MINING & TECH
HARQ number computing method and device
ActiveCN105337709AThe calculation process is clearMaintain clarityError prevention/detection by using return channelComputer networkCalculation methods
Embodiments of the invention provide an HARQ number computing method and device. The method comprises the following steps: obtaining a current system frame number and a sub-frame number of a current sub-frame, obtaining a remaining HARQ number, and calculating HARQ numbers corresponding to the current system frame number and the sub-frame number of the current sub-frame according to the current system frame number, the current sub-frame number and the remaining HARQ number. The HARQ number computing method and device provided by the embodiments of the invention can be used for well solving the problems of computation of the HARQ number under TTI Bundling when time slot allocation is 0, and ACK processing and virtual ACK processing of a GAP area.
Owner:CHENGDU TD TECH LTD
Active power distribution network harmonic source positioning analysis method
InactiveCN103983851AImprove accuracyThe calculation process is clearSpectral/fourier analysisFault locationTotal harmonic distortionEstimation methods
The invention discloses an active power distribution network harmonic source positioning analysis method. The method includes the following steps that according to the characteristics of an active power distribution network, network parameters and measurement data of various fundamental waves and harmonic waves are obtained; then voltage of fundamental waves of all nodes of the active power distribution network and voltage of sub-harmonic waves of the all nodes of the active power distribution network are worked out through a fundamental wave and harmonic wave state estimation method; currents of fundamental waves of all branches of the active power distribution network and currents of sub-harmonic waves of the all branches of the active power distribution network are worked out respectively according to voltage of the fundamental waves of nodes at the two ends of each branch, voltage of the sub-harmonic waves of the nodes at the two ends of each branch and branch parameters; finally, through the relationship formula of branch currents and node injection currents, node injection fundamental wave currents of each node and node injection sub-harmonic wave currents of each node are worked out, the distribution situation of current total harmonic distortion of all nodes of the active power distribution network is worked out further, therefore, distribution positions of all harmonic sources can be positioned accurately, and the characteristics of the harmonic sources are analyzed. The active power distribution network harmonic source positioning analysis method has the advantages that multiple harmonic sources of the active power distribution network are positioned accurately, the calculation process is clear, and programming is easy.
Owner:HOHAI UNIV
Wind-thermal bundled power generation system optimization planning method
InactiveCN106329581AReduced number of assembled machinesLess investmentSingle network parallel feeding arrangementsRenewable energy source integrationDynamic planningElectric power system
The invention belongs to the technical field of power system planning, and particularly relates to a wind-thermal bundled power generation system optimization planning method. The minimum total bundled system cost including the operation cost, the investment and the maintenance cost serves as an objective function, the minimum startup and shutdown and the maximum output and the minimum output of a thermal power unit and the like serve as constraint conditions, a wind-thermal bundled power generation system optimization planning model including a system operation behavior is built, and the model is solved by adopting algorithms such as dynamic planning and a tree drop technique. On the basis of simulating the operation behavior of the bundled system and in consideration of the operation constraints of the thermal power unit, the operation cost of the thermal power unit can be acquired more accurately, and the wind-thermal capacity planning result in the bundled system is more accurate and more reasonable.
Owner:STATE GRID CORP OF CHINA +1
Method of detecting dryness of wet steam of a once-through steam injection boiler and a detecting apparatus therefor
InactiveUS8141412B2The test result is accurateLow costVolume/mass flow measurementMaterial moisture contentData displayWet steam
Owner:LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
Control method of three-phase four-leg grid-connected inverter with adaptive current limiting function
The invention relates to the field of power system protection and control, and provides a method for determining upper limit values of various sequence output current in view of shortage of corresponding researches on determination of various sequence current limiting values under a dividing-sequence control strategy of a three-phase four-leg inverter. According to the method, development of the maximum voltage balancing ability of the inverter can be ensured. Therefore, according to the adopted technical scheme, a control method of a three-phase four-leg grid-connected inverter with an adaptive current limiting function comprises the steps of calculating the sun of various phases of negative sequence current and zero sequence current under unified two-phase synchronous rotating coordinates and calculating the maximum value of the sequence current according to actual upper limit values of various phases of current, namely the maximum carrying current of a power electronic switching device of the inverter, so that the inverter can develop the maximum voltage balancing ability under the condition that various phases of current do not exceed the maximum value. The control method is mainly used for power system protection and control occasions.
Owner:TIANJIN UNIV
Photovoltaic generated power forecasting device and method
PendingCN109060618AEliminate complex inversion processGuaranteed real-timePhotovoltaic monitoringSystems intergating technologiesParticulatesDirect radiation
The invention discloses a photovoltaic generated power forecasting device and method. The invention relates to the technical field of photovoltaic power generation. The photovoltaic generated power forecasting device comprises a PM10 (Particulate Matter) sensor, a PM2.5 sensor, a humidity sensor, a visibility sensor, a temperature sensor, a RS232 (Recommend Standard) communication interface, a single chip, a power circuit, a clock circuit, a 3G (The 3rd Generation Telecommunication) communication module, a FPGA (Field Programmable Gate Array) chip and a FLASH chip. Based on acquiring a large number of actual samples of PM2.5 concentration-PM10 concentration-humidity-visibility-AOD (Aerosol Optical Depth), the power forecasting method forecasts the AOD by using a BP (Back-Propagation) neural network method; the AOD and the precipitable water are selected as main change parameters; the two-band atmospheric radiation transmission model is adopted to calculate the solar direct radiation intensity and the scattering radiation intensity; thus, the total radiation intensity received by the photovoltaic cell panel is forecasted; at last, the photovoltaic generated power is precisely forecasted in real time through the photovoltaic conversion model; the output power of the photovoltaic power generation is forecasted; and the method is advantaged in clear calculation process and high forecasting precision.
Owner:ZHANGJIAKOU POWER SUPPLY COMPANY OF STATE GRID JINBEI ELECTRIC POWER COMPANY +1
Method for determining grade of single-bus trip-out loss of load accident in double-bus connection mode
ActiveCN107749623AThe calculation process is clearSimple structureAc network circuit arrangementsNetwork analyticsTidal current
The invention discloses a method for determining the grade of a single-bus trip-out loss of load accident in a double-bus connection mode. The method identifies the voltage loss of a transformer station caused by the trip-out through network analysis, and measures the shedding load of a stability control device caused by the trip-out by power flow analysis, and determines and analyzes the grade ofa loss of load accident in combination of the results in the two previous aspects. The method is clear in calculation process, simple in structure, convenient to operate, and good in practicality, and can provide reference and basis for scheduling operation risk assessment. According to the inventive idea, the present invention also provides a system for determining the grade of a single-bus trip-out loss of load accident in a double-bus connection mode.
Owner:GUIZHOU POWER GRID CO LTD
Safety constraint unit combination rapid calculation method and system based on model dimension reduction
PendingCN110556823AReduce Discrete Variable DimensionalityLower integer variableSingle network parallel feeding arrangementsSpecial data processing applicationsStart stopPower flow
The invention discloses a safety constraint unit combination rapid calculation method and system based on model dimension reduction. The method comprises the steps as follows: performing calculation to obtain an active power output result of each unit and a power flow result of each power transmission section according to a preset safety constraint economic dispatching relaxation model; dividing generator units into must start and stop units and buffer units according to the active power output result of each generator unit; dividing the power transmission sections into valid sections and invalid sections according to the power flow result of each power transmission section; obtaining a safety constraint unit combination dimension reduction model by taking the start-stop state of the buffer units as a combination decision variable and considering the limit value constraint of the valid power transmission sections; and performing calculation to obtain a unit combination result accordingto the safety constraint unit combination dimension reduction model. By identifying invalid shaping variables and network constraints, the feasible region is reduced, and the calculation efficiency is improved.
Owner:CHINA SOUTHERN POWER GRID COMPANY +1
Preplanning calculation method for integral dropper in elastic chain type suspension for overhead contact system
The invention provides a preplanning calculation method for an integral dropper in elastic chain type suspension for an overhead contact system. The method comprises following steps: 1, calculating the height of a contact wire; 2, calculating the pulling force of the dropper; 3, calculating the height of a carrier cable; 4, calculating the height of an elastic suspension cable; and 5, calculating the dropper blanking length. According to the invention, the length of the integral dropper is calculated through the calculation method based on a suspension cable model, a calculation process is reasonable and clear, calculation results are accurate, and the accuracy of factory manufacturing for the integral dropper is guaranteed.
Owner:CHINA RAILWAY DESIGN GRP CO LTD
Electric power spot market clearing calculation method based on multi-strategy fusion dimension reduction
ActiveCN110751383AReduce excess spaceImprove solution efficiencyResourcesInformation technology support systemCalculated resultPower grid
The invention discloses an electric power spot market clearing calculation method based on multi-strategy fusion dimension reduction, and the method comprises the steps: firstly obtaining a power gridrange and a calculation period for carrying out the clearing calculation of an electric power spot market, and determining a calculation boundary; then carrying out merging analysis of similar time periods, and reducing the number of time periods for entering clearing calculation; establishing and solving a relaxation safety constraint unit combination model, carrying out invalid start-stop variable identification and effective safety constraint identification according to a calculation result, and reducing the number of start-stop variables and safety constraints entering clearing calculation; establishing a time period merged security constraint unit combination dimension reduction clearing model, and quickly solving to obtain a unit combination result; and carrying out full-time-periodeconomic dispatching and safety check analysis based on a unit combination result, adding the out-of-limit time period and the monitoring section into a unit combination dimension reduction clearingmodel, and finally obtaining an electric power spot market clearing result through iterative computation.
Owner:NARI TECH CO LTD +2
Improved method for selecting high-voltage circuit breaker in power transformation and distribution system
ActiveCN107505570AImprove efficiencyImprove accuracyCircuit interrupters testingDistribution power systemElectric power distribution
The invention provides an improved method for selecting a high-voltage circuit breaker in a power transformation and distribution system, which summarizes a relationship between a periodic component and a direct current component of breaking short-circuit current and improves a calculation formula for the breaking capacity of the circuit breaker. Different from the traditional calculation method, the improved method respectively calculates the periodic component and the direct current component of the short-circuit current and then compares with breaking current of the circuit breaker so as to judge whether the breaking current of the circuit breaker can meet requirements or not. The time-periodic component relationship which is relatively simple and easy to search and calculate is found out by using a relational expression, a value range of a time constant in a power distribution system is deduced, and a calculation method is provided; and the breaking capacity of the circuit breaker is determined through comparing the breaking time. The improved method is simple and clear in calculation process, the original calculation data is easy to obtain, and the calculation result is accurate. Electrical equipment with a high performance-cost ratio can be accurately selected because the accuracy is substantially improved.
Owner:鞍钢集团工程技术有限公司
Water regimen monitoring and analyzing system and method facing ecological water demands of river-communicating lakes
ActiveCN106871876ASolve real-time monitoring problemsUnderstand the status of ecological water demand satisfactionOpen water surveyRegimenEnvironmental resource management
The invention discloses a water regimen monitoring and analyzing system and method facing ecological water demands of river-communicating lakes. The system comprises a water demand calculation module, a real-time monitoring module, an analysis and comparing module and a display output module, which are connected with a control maintenance module respectively, wherein the water demand calculation module comprises a lake region ecological water demand calculation unit, a lake-exiting ecological water demand calculation unit and a lake-entering ecological water demand calculation unit; the real-time monitoring module comprises a lake-exiting flow monitoring unit, a lake-entering flow monitoring unit and a lake region state monitoring unit; the analysis and comparing module is used for receiving data from the real-time monitoring module and the water demand calculation module and performing analyzing and comparing; the display output module is used for representing the data obtained by the analysis and comparing module, and extracting and outputting. By adopting the water regimen monitoring and analyzing system and method, the real-time monitoring problem of an ecological water demand meeting condition of the river-communicating lakes is solved, and a lake region ecological water demand meeting rate, a lake-exiting ecological water demand meeting rate and a lake-entering ecological water demand meeting rate of the lakes can be measured respectively and are visually and dynamically displayed.
Owner:安徽金海迪尔信息技术有限责任公司
RDE data post-processing method and device, equipment and storage medium
PendingCN111930818AEasy to analyze and calculateThe calculation process is clearDatabase management systemsAnalysing gaseous mixturesAlgorithmData translation
The invention discloses an RDE data post-processing method, device and equipment and a storage medium. The method comprises the steps that RDE test data and an emission delay time table of a vehicle are acquired; performing data translation on the RDE test data according to the emission delay time table, screening out RDE calculation data meeting preset requirements, and unifying data formats; dividing time windows according to laws and adjustments, determining an average emission set corresponding to each time window according to the RDE calculation data, and determining an emission test result corresponding to each average emission in the average emission set. The method is suitable for RDE test data acquired by different RDE emission devices. The RDE data post-processing method solves the problem that existing RDE data post-processing software can only process RDE test data collected by specific RDE emission equipment and has limitation, can conveniently and quickly analyze and calculate the RDE test data to obtain a test result, and is clear in calculation process and accurate and reliable in result.
Owner:CHINA FIRST AUTOMOBILE
A Calculation Method of Earth Pressure in Railway Tunnel Portal
InactiveCN104331529BTroubleshoot pressure calculationsThe calculation process is clearSpecial data processing applicationsRailway tunnelStructure of the Earth
Owner:SOUTHWEST JIAOTONG UNIV
Computing method for flexible gear minimum teeth number of wave generator external harmonic gear mechanism
InactiveCN104806725ACalculation method is simpleSimple calculationPortable liftingGearing elementsGear wheelEngineering
The invention relates to a computing method for flexible gear minimum teeth number of a wave generator external harmonic gear mechanism. The method comprises the following steps: (1) setting flexible gear fatigue strength allowable safety coefficient according to the design requirement; (2) selecting flexible gear material and heat treatment mode thereof through analogy method; (3) acquiring bending fatigue limit and elasticity modulus of flexible gear material from material mechanical performance handbook; (4) confirming teeth number difference between the flexible gear and the steel gear; (5) computing minimum admissible value of the flexible gear teeth number; (6) confirming minimum teeth number of flexible gear. Compared with prior art, the computing method for flexible gear minimum teeth number of the wave generator external harmonic gear mechanism fills up the blank on calculation of flexible gear teeth number minimum of wave generator external harmonic gear mechanism of mechanical design handbook and related books, and avoids confirming blindness of flexible gear; the computing process is simple and the computing method can be directly used for computing the matched teeth of flexible gear and steel gear of the wave generator external harmonic gear mechanism.
Owner:CHANGZHOU UNIV
Aggregate elasticity modulus detection method and application
ActiveCN111239253AImprove performancePouring molding time is shortAnalysing solids using sonic/ultrasonic/infrasonic wavesPreparing sample for investigationShear modulusReinforced concrete
The invention discloses an aggregate elasticity modulus detection method and application. The detection method comprises the following steps: measuring the volume of aggregate, pouring the aggregate and a cementing agent, and curing to obtain a test piece; measuring the propagation velocity of the ultrasonic wave in the test piece by adopting an opposite measurement method, and processing data toobtain the longitudinal wave velocity of the ultrasonic wave in the test piece; calculating the elasticity modulus, the bulk modulus and the shear modulus of the test piece and the bulk modulus and the shear modulus of the cementing agent according to the longitudinal wave velocity; calculating the bulk modulus and the shear modulus of the aggregate according to a micromechanics formula; and calculating the elasticity modulus and Poisson's ratio of the aggregate according to the bulk modulus and shear modulus of the aggregate. The detection method provided by the invention is wide in application range and high in accuracy. The aggregate elasticity modulus and Poisson's ratio obtained through detection can be used for calculating the wave velocity of ultrasonic waves in concrete made of aggregate, predicting the performance of the concrete and improving the accuracy of safety evaluation and durability evaluation of a reinforced concrete structure.
Owner:ZHEJIANG UNIV
Three-phase power flow calculation method for distributed generation and distribution network considering phase sequence hybrid method
InactiveCN103094900BStrong handlingEasy programmingAc network circuit arrangementsPower flowLoop analysis
Owner:HOHAI UNIV
Reactive power compensation method and device for distributed power supply
InactiveCN107069759ASuppress reactive power fluctuationsSuppresses voltage fluctuationsReactive power adjustment/elimination/compensationReactive power compensationPower compensationControl system
The invention relates to a reactive power compensation method and device for a distributed power supply. The reactive power compensation method comprises the steps of calculating reactive power of a system according to acquired current and voltage of the system; acquiring a reactive power regulation value which the system is supposed to have in order to enable the reactive power of the system to approach to the set value according to a set value and the reactive power of the system; and calculating reactive power of a distributed power supply branch according to acquired current and voltage of the distributed power supply branch. Compensation is performed on the reactive power of the system, and the voltage and current of the system are acquired in real time to act as feedback values so as to perform real-time regulation, and a closed-loop control system for the reactive power of the system is formed. When reactive power compensation is performed on the system, a reactive power compensation value for the system is enabled to be the difference between a reactive power regulation value of the system and the reactive power of the distributed power supply branch, so that variations in reactive power of the distributed power supply branch are balanced through regulating the reactive power compensation value for the system in real time, reactive power compensation can be performed quickly, and thus voltage fluctuations of the system are suppressed.
Owner:STATE GRID SHANDONG ELECTRIC POWER +1
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