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33results about How to "Easy to optimize control" patented technology
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Water-cooled motor controller for high power density electric vehicle
InactiveCN102413671AImprove power densityEasy and flexible operationCircuit arrangements on support structuresCooling/ventilation/heating modificationsCapacitanceBusbar
The invention provides a water-cooled motor controller for a high power density electric vehicle. In the controller, an opening is formed at the bottom of one side of a shell, and a water cooling radiator is arranged at the opening; a power module, a direct current bus support capacitor, a pre-electrified resistor, a main relay and a current sensor are arranged in the shell respectively; the power module is arranged on the upper surface of the water cooling radiator; the direct current bus support capacitor, the pre-electrified resistor, the main relay and the current sensor are fixed in the shell respectively through bolts; the power module, the direct current bus support capacitor and the main relay are connected through a conflux busbar to form a high-voltage loop; a power factor correction capacitor is fixed on the conflux busbar; a drive circuit board which is used for a power module is arranged above the power module; a separator and a control circuit board are arranged above the drive circuit board sequentially; and a plurality of power cable connectors used for assembling power cables pass through the lateral wall of the shell. The water-cooled motor controller has the advantages of flexible and convenient operation process, strong radiation capability, high power density, good electromagnetic compatibility and safe and reliable use effect.
Owner:TIANJIN QINGYUAN ELECTRIC VEHICLE
Titanium alloy and stainless steel electron beam welding filler material, and preparation process and method thereof
InactiveCN103192195APrecise thickness controlImprove alloy densityElectron beam welding apparatusWelding/cutting media/materialsSteel platesFe element
The invention relates to the field of heterogenetic difficultly-welded material melting, and specifically relates to a titanium alloy and stainless steel electron beam welding filler material. The titanium alloy and stainless steel electron beam welding filler material is characterized in that the electron beam welding filler material between a titanium alloy plate and a stainless steel plate comprises a vanadium layer and a copper-chromium alloy layer, wherein the copper-chromium alloy layer is composed of the following elements in percentage by mass: 30-50% of chromium powder, 2-5% of nickel powder, 3-7% of titanium powder and the balance of copper powder. Through changing the compositions of the filler material, Ti and Fe elements can be effectively separated so as to avoid the formation of brittle intermetallic compounds in welds, therefore, the filler material has the advantages of high weld density, small brittleness, no pore and crack, and the like.
Owner:HARBIN INST OF TECH AT WEIHAI
Reactive optimal online control method for analyzing mixed economic pressure difference and sensitivity
InactiveCN102856919AReduce optimization effectImprove voltage qualityReactive power adjustment/elimination/compensationReactive power compensationAutomatic controlPower grid
The invention discloses a reactive optimal online control method for analyzing mixed economic pressure difference and sensitivity. The reactive optimal online control method comprises the steps of preparation of power grid data, calculation of an economic pressure difference optimal initial value, online sensitivity analysis and calculation, a P-Q load flow calculation method considering SVC (Static Var Compensator) static model, a construction method of a dynamic reactive power source, an iteration convergence criterion method and real-time automatic equipment control. With the adoption of the method, by monitoring the running state of a power grid and combining the actual running condition of the power grid, switching of a capacitor and an electric reactor equipment switch in a reactive optical control equipment, fine control on reactive power of SVC dynamic reactive compensation equipment and power plant reactive power generation regulation are realized, an optimization algorithm is improved, a new iteration solving mode is put forward, the dynamic reactive power source is built to carry out practical treatment, a solving method is selected for calculation of a layered node optimized voltage, and an iteration convergence criterion is improved, thus improving the convergence and the practicability of the economic pressure difference optimization algorithm.
Owner:HOHAI UNIV
Method for rapidly representing sludge dewatering performance
ActiveCN101980004AEasy to operateLess sample requiredFluorescence/phosphorescenceChemistrySewage treatment
The invention relates to a method for rapidly representing sludge dewatering performance. The method comprises the following steps of: collecting 100ml of raw sludge or concentrated sludge; filtering with a filter membrane of 0.45mu m to obtain 10mL of sludge supernatant; measuring soluble organic carbon (DOC) of the supernatant; diluting the supernatant with distilled water until the DOC is less than 10mg / L; collecting a three-dimensional fluorescence spectrum (EEM) of the diluted supernatant; substituting the collected EEM spectrum into a database to analyze a parallel factor (PARAFAC) by using a DOMF1uor tool kit of Mat1ab 7.0 data processing software to determine a score of a component with excitation and transmission wavelength of (220,280) / 350nm; and multiplying the score by a diluting multiple of a sample and substituting the product into a sludge dewatering performance judgment relational formula to represent the sludge dewatering performance. By the method, the sludge dewatering performance can be rapidly detected without chemical reagent, and the detection can be completed only through filtering, diluting and three-dimensional fluorescence spectrum; and the method can be applied to monitoring the dewatering performance of various types of sludge of sanitary sewage treatment factories, industrial sewage biological treatment factories and the like.
Owner:TONGJI UNIV
Production process of aluminum profile for automobile impact energy absorbing components and produced aluminum profile
The invention discloses a production process of an aluminum profile for automobile impact energy absorbing components and a produced aluminum profile, relates to the technical field of aluminum and aluminum alloy extrusion machining and heat treatment. The production process comprises the following steps that an aluminum alloy ingot is subjected to uniform annealing treatment, extrusion and quenching treatment, tensile treatment and aging treatment in sequence; then, the aluminum alloy ingot is cooled to 490-525 DEG C after the uniform annealing treatment, and extrusion is carried out again; and the aging treatment includes first, natural aging treatment and then secondary artificial aging treatment, the natural aging treatment time is carried out for 30-60 h, the heat preservation temperature of a first artificial aging stage is 100-120 DEG C, the heat preservation time is 2-3.5 h, the heat preservation temperature of a second artificial aging stage is 150-170 DEG C, and the heat preservation time is 8-12 h. By reasonably designing parameters of extrusion process and heat treatment process, the production process can improve tensile mechanical properties simultaneously without reducing the plasticity, so that the aluminum profile has better compression performance.
Owner:SHANDONG NANSHAN ALUMINUM +3
Method for synchronously removing ammonia nitrogen and nitrate nitrogen in continuous flow USB reactor through short-range denitrification reinforcement DEAMOX technology
ActiveCN106045032ASolve difficult problems in depthReduce processing costsWater contaminantsTreatment with anaerobic digestion processesSludgeContinuous flow
The invention discloses a method for synchronously removing ammonia nitrogen and nitrate nitrogen in a continuous flow USB reactor through a short-range denitrification reinforcement DEAMOX technology, and belongs to the field of sewage treatment. The method comprises the steps that a USB reactor is inoculated with DEAMOX granule sludge, nitrate nitrogen is converted into nitrite nitrogen through an organic carbon source in fed water in short-range denitrification, ammonia nitrogen in the fed water is removed through the in-situ anaerobic ammonia oxidation effect, and the purpose of efficiently removing nitrogen is achieved by optimizing the mass concentration ratio of nitrate nitrogen to ammonia nitrogen in wastewater and controlling and adjusting the flow of organic carbon source in fed water. The problems that treatment of wastewater containing ammonia nitrogen and nitrate nitrogen is low in treating efficiency and high in energy consumption are effectively solved, aeration consumption in the aerobic stage is not needed, the external carbon source consumption is reduced, the residual sludge yield is low, and the follow-up treating cost is greatly reduced; in addition, the DEAMOX technology achieved in the continuous flow USB reactor has the advantages that the reaction speed is high, nitrate nitrogen produced in anaerobic ammonia oxidation process is removed in situ, and the total nitrogen removal rate and the denitrifying load are high.
Owner:BEIJING UNIV OF TECH
Method and device for restraining power-frequency ripple current
InactiveCN103312136AEasy to optimize controlReduce current ripplePhotovoltaic energy generationPower conversion systemsCapacitanceLow-pass filter
The invention discloses a method and a device for restraining power-frequency ripple current. The device comprises an energy power supply, a bidirectional DC / DC (direct current / direct current) converter, a filter capacitor C3, an energy buffer capacitor C4 and a low-pass filter circuit, for sampling voltage, of the energy buffer capacitor, an energy power supply current detecting unit and a low-pass filter circuit of the detecting unit, a voltage reference Vref of C4, a current ripple restraining error amplifier EA1, a voltage control loop error amplifier EA2 of C4, a summing circuit of EA1 and EA2, and loads. By the device, restraining of energy power supply power-frequency ripple current is achieved under single-point current sampling, the defect that power-frequency ripples cannot be filtered effectively when large-capacity capacitors are used is overcome, and system cost is lowered while sampling lose is reduced and system efficiency is increased.
Owner:SOUTHWEST JIAOTONG UNIV
Device and method for synchronously treating high-concentration NO3--N waste water, sludge digestion liquid and municipal sewage
ActiveCN106006956ALower Disposal CostsSave dosing costWater treatment parameter controlWater contaminantsHigh concentrationNitration
The invention discloses a device and method for synchronously treating high-concentration NO3--N waste water, sludge digestion liquid and municipal sewage. The NO3--N waste water and the sludge digestion liquid enter a first short-range denitrification reactor, NO3--N is converted into NO2--N through organic matter and an outer carbon source which are contained in the digestion liquid, and effluent containing NH4+-N and NO2--N enters an anaerobic ammonia oxidation reactor for denitrification; effluent containing nitrate nitrogen and the municipal sewage enter a second short-range denitrification reactor, NO3--N is converted into NO2--N in the presence of an organic carbon source in the municipal sewage, then the municipal sewage flow back to the anaerobic ammonia oxidation reactor, and NO2--N and NH4+-N are synchronously removed. The problems that when the high-concentration NO3--N waste water, the sludge digestion liquid and the municipal sewage are independently treated through a traditional method, the nitrogen removal efficiency is low, energy consumption is high, and the sludge output is high are solved, and according to the device and method, running cost I slow, the occupied area is small, the structure is simple, and optimal control is easy.
Owner:BEIJING UNIV OF TECH
Engine system based on turbo charger and fuel ratio improving method thereof
ActiveCN102777287APrevent poor layoutEasy to optimize controlInternal combustion piston enginesNon-fuel substance addition to fuelLow speedTurbocharger
The present invention discloses an engine system based on a turbo charger and a fuel ratio improving method thereof. The engine system may include an electric or mechanical supercharger and an LP-EGR, basically with a turbocharger, an EGR valve, a channel control valve, and a bypass valve, which control the flow rate of external air and exhaust gas, may be integrally operated, and a operation section may be divided into a turbo-lag and low torque section, a mid-load section, and mid / high-load section such that the open amount of EGR valve, channel control valve, and bypass valve may be optimally controlled, such that it may be possible to improve availability for a low-speed / high-load section with turbo-lag reduced, using supercharger and considerably increase the ratio of fuel efficiency improvement in the low-speed / high-load section, using LP-EGR operating with supercharger.
Owner:HYUNDAI MOTOR CO LTD
Vehicle engine starting system
InactiveCN102926906AEasy to optimize controlSave powerPower operated startersElectric motor startersElectric machineDrive motor
The invention discloses a vehicle engine starting system, which comprises a motor and a water pump for cooling the engine, wherein the motor comprises an output shaft; one end of the output shaft is connected with the water pump through a first clutch, and the other end of the output shaft is connected with a flywheel of the engine through a second clutch; and the output shaft of the motor can optionally rotate in one of two opposite directions so as to optionally start the engine or drive the water pump. According to the starting system, the motor is started after the engine is started, and serves as a driving motor for the water pump, and a motor can be eliminated, so that power can be saved, the cost can be reduced, and a vehicle cooling system is optimally controlled.
Owner:JOHNSON ELECTRIC GUANGDONG CO LTD
High-magnetic potential starting and low-magnetic potential maintaining type solenoid valve control module
InactiveCN102734541BHighly integratedReduce volumeOperating means/releasing devices for valvesSolenoid valveControl circuit
The invention relates to a high-magnetic potential starting and low-magnetic potential maintaining type solenoid valve control module, comprising a power source, a rectifying and filtering circuit and a coil load. The high-magnetic potential starting and low-magnetic potential maintaining type solenoid valve control module is characterized by further comprising a starting circuit and a maintaining circuit. The power source is connected with the rectifying and filtering circuit; and an output of the rectifying and filtering circuit is connected with the coil load respectively through the starting circuit and the maintaining circuit. The high-magnetic potential starting and low-magnetic potential maintaining type solenoid valve control module provided by the invention is a control circuit with a self protection function, and is matched with a solenoid valve, so that alternating-and-direct current generality, wide voltage input, and energy conversation and soundless operation control canbe realized.
Owner:FUZHOU UNIV
A method for rapid evaluation of dewatering performance of oxidatively conditioned sludge based on redox potential
ActiveCN108931563BNo preprocessing requiredEasy to operateSludge treatment by de-watering/drying/thickeningSludge treatment by oxidationSludgeRedox
Owner:HUAZHONG UNIV OF SCI & TECH
Titanium alloy and stainless steel electron beam welding filler material, preparation process and method thereof
InactiveCN103192195BEasy to optimize controlSolve substantive technical problemsElectron beam welding apparatusWelding/cutting media/materialsVolumetric Mass DensityTitanium alloy
Owner:HARBIN INST OF TECH AT WEIHAI
Direct digital frequency synthesizer
InactiveCN103888139AImprove efficiencyReduced conversion timePulse automatic controlVIT signalsDigital analog converter
The invention provides a direct digital frequency synthesizer which comprises an accumulator used for accumulating input frequency control words FTW, a multi-channel phase-amplitude conversion module which comprises 2m data processing channels with equal-difference phases, a data selecting and outputting module and a digital to analog converter. In terms of the ith data processing channel, a bias phase FTW*i is added to an accumulation result of the frequency control words output by the accumulator, phase to amplitude conversion is performed on the result, and amplitude digital signals are output. The data selecting and outputting module is used for sequentially selecting the amplitude digital signals from the 2m data processing channels with the equal-difference phases and sending the amplitude digital signals into the follow-up digital to analog converter. The digital to analog converter is used for converting the amplitude digital signals output by the data selecting and outputting module into analog signals and outputting the analog signals. According to the direct digital frequency synthesizer, a manner of connecting the data processing channels in parallel is adopted, and phase-amplitude conversion of multiple channels is performed at the same time, so that the phase-amplitude conversion efficiency is improved, and conversion time is saved.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Hot alkaline recycling device of calcining furnace
InactiveCN104990418AReduce raw material and energy consumptionReduce manufacturing costWaste heat treatmentProcess engineeringFuel gas
The invention relates to a hot alkaline recycling device of a calcining furnace and a using method of the device. The hot alkaline recycling device comprises a feeding tower, conveying machines, the calcining furnace, fuel gas, a preheater, an air compressor, a preheating fan, a fluidization fan, a stage separation device, washers, an electrostatic dust collector, a decontamination fan and an ash hopper. The stage separation device comprises a first-stage stage separation part, wherein a stage separation channel of the first-stage stage separation part is communicated with a top gas outlet of the calcining furnace, is further connected with the washers and is communicated with the calcining furnace; and the washers, a tray washer and a wet type electrostatic dust collector are sequentially communicated.
Owner:HEBEI TONGMING ENVIRONMENTAL PROTECTION
A method for synchronous removal of ammonia nitrogen and nitrate nitrogen in continuous flow usb reactor by short-range denitrification enhanced deamox process
ActiveCN106045032BSolve difficult problems in depthReduce processing costsWater contaminantsTreatment with anaerobic digestion processesSludgeTotal nitrogen
The invention discloses a method for synchronously removing ammonia nitrogen and nitrate nitrogen in a continuous flow USB reactor through a short-range denitrification reinforcement DEAMOX technology, and belongs to the field of sewage treatment. The method comprises the steps that a USB reactor is inoculated with DEAMOX granule sludge, nitrate nitrogen is converted into nitrite nitrogen through an organic carbon source in fed water in short-range denitrification, ammonia nitrogen in the fed water is removed through the in-situ anaerobic ammonia oxidation effect, and the purpose of efficiently removing nitrogen is achieved by optimizing the mass concentration ratio of nitrate nitrogen to ammonia nitrogen in wastewater and controlling and adjusting the flow of organic carbon source in fed water. The problems that treatment of wastewater containing ammonia nitrogen and nitrate nitrogen is low in treating efficiency and high in energy consumption are effectively solved, aeration consumption in the aerobic stage is not needed, the external carbon source consumption is reduced, the residual sludge yield is low, and the follow-up treating cost is greatly reduced; in addition, the DEAMOX technology achieved in the continuous flow USB reactor has the advantages that the reaction speed is high, nitrate nitrogen produced in anaerobic ammonia oxidation process is removed in situ, and the total nitrogen removal rate and the denitrifying load are high.
Owner:BEIJING UNIV OF TECH
Vehicle engine starting system
The invention discloses a vehicle engine starting system. The vehicle engine starting system comprises a motor, a water pump, a first clutch and a second clutch, wherein the water pump is used for cooling an engine. The motor comprises an output shaft, wherein one end of the output shaft is connected with the water pump through the first clutch, and the other end of the output shaft is connected with a flywheel of the engine through the second clutch. The first clutch is an electromagnetic clutch and comprises a driving piece and a driven piece, wherein the driving piece is in drive connection with the output shaft of the motor and can rotate along with the output shaft, the driven piece is in drive connection with the water pump so that the water pump can rotate along with the driven piece, the driving piece and the driven piece are respectively provided with teeth, the teeth of the driving piece can be meshed with the teeth of the driven piece, the driving piece can move between the first position and the second position, the driving piece is meshed with the driven piece when located in the first position so that the water pump can be driven to work, the driving piece is not meshed with the driven piece when located in the second position, the driving piece moves from the first position to the second position when the first clutch is powered on, and then the motor starts the engine.
Owner:JOHNSON ELECTRIC SHENZHEN
vehicle engine starting system
InactiveCN102926906BEasy to optimize controlSave powerPower operated startersElectric motor startersElectric machineDrive motor
The invention discloses a vehicle engine starting system, which comprises a motor and a water pump for cooling the engine, wherein the motor comprises an output shaft; one end of the output shaft is connected with the water pump through a first clutch, and the other end of the output shaft is connected with a flywheel of the engine through a second clutch; and the output shaft of the motor can optionally rotate in one of two opposite directions so as to optionally start the engine or drive the water pump. According to the starting system, the motor is started after the engine is started, and serves as a driving motor for the water pump, and a motor can be eliminated, so that power can be saved, the cost can be reduced, and a vehicle cooling system is optimally controlled.
Owner:JOHNSON ELECTRIC GUANGDONG CO LTD
Grinding tooth cut-off length calculation method for pulping equipment equipped with straight tooth element
InactiveCN114351495AClear principleEasy calculationPulp beating/refining methodsTooth grindingMechanical design
Owner:SHAANXI UNIV OF SCI & TECH
Method for rapidly representing sludge dewatering performance
Owner:TONGJI UNIV
A reactive power and voltage support capability evaluation method for multi-partition power grid
ActiveCN111525589BEffective data supportInhibition of sick bendingAc network voltage adjustmentReactive power compensationReference sampleControl engineering
The invention provides a reactive power and voltage support capability evaluation method for a multi-partition power grid. The main steps include selecting key evaluation index data of the reactive power and voltage support capability of the multi-partition power grid; establishing an evaluation index system for the reactive power and voltage support capability of the multi-partition power grid; using Fuzzy membership function and dynamic time warping algorithm perform fuzzy analysis on the data to be evaluated, and calculate the similarity between the data to be evaluated and the reference sample after fuzzy processing; determine the reactive power and voltage support of the multi-partition power grid according to the similarity between the data to be evaluated and the reference data ability. The invention formulates an index system that can accurately characterize the reactive power and voltage support capability of a multi-partition power grid, and applies the fuzzy theory and dynamic time warping algorithm to the evaluation of the reactive power and voltage support capability of the power grid partition, which can accurately evaluate the reactive power support capability of the power grid partition. The provincial adjustment AVC system provides data support.
Owner:JIANGSU ELECTRIC POWER CO
Household lead-acid energy storage apparatus
InactiveCN105932956AEasy to optimize controlEasy to operateLead-acid accumulatorsPhotovoltaicsHuman–machine interfaceEnergy management software
The invention discloses a household lead-acid energy storage apparatus. The household lead-acid energy storage apparatus comprises a solar cell, a lead-acid energy storage unit, a bidirectional control inverter, a remote controller and a household appliance load, wherein the external ends of the solar cell and the domestic appliance load are connected with the bidirectional control inverter separately through cables; the energy source end of the lead-acid energy storage unit is connected with the energy source control end of the bidirectional control inverter; charging-discharging DC / DC and DC / AC conversion modules are arranged in the bidirectional control inverter; the DC / DC input end is connected with the output end of the solar cell; a switch is arranged at the DC / AC input end; and special energy management software is arranged in the remote controller for realizing optimization and control of a man-machine interface conveniently. According to the household lead-acid energy storage apparatus, the capacity of the lead-acid energy storage unit is determined according to the household appliance load power; and therefore, the energy storage apparatus is easy to increase or decrease the capacity, convenient to install, rapid and convenient to operate, and particularly suitable for households in regions without electricity or regions with unstable power grid and electric energy.
Owner:BEIJING SHOTO ENERGY STORAGE TECH CO LTD +1
A device and method for synchronously treating high-concentration no3--n wastewater, sludge digestate and urban sewage
ActiveCN106006956BLower Disposal CostsSave dosing costWater treatment parameter controlWater contaminantsHigh concentrationNitration
The invention discloses a device and method for synchronously treating high-concentration NO3--N waste water, sludge digestion liquid and municipal sewage. The NO3--N waste water and the sludge digestion liquid enter a first short-range denitrification reactor, NO3--N is converted into NO2--N through organic matter and an outer carbon source which are contained in the digestion liquid, and effluent containing NH4+-N and NO2--N enters an anaerobic ammonia oxidation reactor for denitrification; effluent containing nitrate nitrogen and the municipal sewage enter a second short-range denitrification reactor, NO3--N is converted into NO2--N in the presence of an organic carbon source in the municipal sewage, then the municipal sewage flow back to the anaerobic ammonia oxidation reactor, and NO2--N and NH4+-N are synchronously removed. The problems that when the high-concentration NO3--N waste water, the sludge digestion liquid and the municipal sewage are independently treated through a traditional method, the nitrogen removal efficiency is low, energy consumption is high, and the sludge output is high are solved, and according to the device and method, running cost I slow, the occupied area is small, the structure is simple, and optimal control is easy.
Owner:BEIJING UNIV OF TECH
Optimization method of roll profile based on roll change cycle
ActiveCN110227722BEasy to optimize controlQuality improvementGeometric CADRollsThermodynamicsEconomic benefits
The invention discloses a roll shape optimization method based on the roll change cycle, which specifically includes: collecting rolling mill equipment parameters, strip process parameters, and roll parameters, calculating the plastic deformation heat generated by the plastic deformation in the rolling deformation zone, rolling The heat generated by frictional work in the control area, the energy absorbed by the roll, the temperature caused by the frictional heat and plastic deformation heat of the roll, the hot roll shape caused by the rising temperature of the roll, and the initial roll shape parameters and the initial value of the objective function G 0 (x), calculate the objective function value, judge |G(x)‑G 0 Whether (x)|≤δ holds true, the optimal roll shape parameters can be obtained. This parameter can be used to calculate the plate shape when considering the hot roll shape through the plate shape model, which is not only conducive to the comprehensive optimization control of the plate shape, so as to produce better quality A good plate shape improves the actual production efficiency and brings better economic benefits to the unit.
Owner:BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
Infrared optimal regeneration temperature device for soot particle filter of diesel engine
InactiveCN113685246ASimple device structureEasy to useExhaust apparatusSilencing apparatusPhysicsElectric energy
The invention discloses an infrared optimal regeneration temperature device for a soot particle filter of a diesel engine. The infrared optimal regeneration temperature device comprises a filtering regeneration bin, connecting pipelines are installed at the two ends of the filtering regeneration bin through connecting structures, each connecting structure comprises a connecting shell, an inner cavity is formed in each connecting shell, threaded holes are formed in the upper side and the lower side of each inner cavity, threaded rods are arranged in the threaded holes, a low-voltage heating element is installed in a filter regeneration cavity and at one side of an air outlet, and an infrared radiator is installed on the filter regeneration cavity. The infrared optimal regeneration temperature device has the advantages that the device is simple in structure and convenient to use, the electric energy utilization rate of infrared radiation heating of soot can be greatly increased, the regeneration time is short, the regeneration process is easy to optimize and control, the indexes of regeneration efficiency, regeneration temperature distribution, regeneration time and regeneration energy consumption are optimized at the same time, and meanwhile, replacement of a filtering device and installation and fixation of the connecting pipelines are facilitated.
Owner:MAANSHAN CHANGLIFA MACHINERY MFG
Method and device for restraining power-frequency ripple current
InactiveCN103312136BEasy to optimize controlReduce current ripplePhotovoltaic energy generationPower conversion systemsCapacitanceLow-pass filter
The invention discloses a method and a device for restraining power-frequency ripple current. The device comprises an energy power supply, a bidirectional DC / DC (direct current / direct current) converter, a filter capacitor C3, an energy buffer capacitor C4 and a low-pass filter circuit, for sampling voltage, of the energy buffer capacitor, an energy power supply current detecting unit and a low-pass filter circuit of the detecting unit, a voltage reference Vref of C4, a current ripple restraining error amplifier EA1, a voltage control loop error amplifier EA2 of C4, a summing circuit of EA1 and EA2, and loads. By the device, restraining of energy power supply power-frequency ripple current is achieved under single-point current sampling, the defect that power-frequency ripples cannot be filtered effectively when large-capacity capacitors are used is overcome, and system cost is lowered while sampling lose is reduced and system efficiency is increased.
Owner:SOUTHWEST JIAOTONG UNIV
Reactive voltage support capability evaluation method for multi-partition power grid
ActiveCN111525589AEffective data supportInhibition of sick bendingAc network voltage adjustmentReactive power compensationReference samplePower grid
The invention provides a reactive voltage support capability evaluation method for a multi-partition power grid. The method mainly comprises the following steps: selecting key evaluation index data ofthe reactive voltage support capability of the multi-partition power grid; establishing a multi-partition power grid reactive voltage support capability evaluation index system; performing fuzzy analysis on the to-be-evaluated data by applying a fuzzy membership function and a dynamic time warping algorithm, and calculating the similarity between the to-be-evaluated data after fuzzy processing and the reference sample; and determining the reactive voltage support capability of the multi-partition power grid according to the similarity between the to-be-evaluated data and the reference data. According to the method, an index system capable of accurately representing the reactive voltage supporting capacity of the multi-partition power grid is formulated, the fuzzy theory and the dynamic time warping algorithm are applied to power grid partition reactive voltage supporting capacity evaluation, the power grid partition reactive supporting capacity can be accurately evaluated, and data support is provided for a provincial dispatching AVC system.
Owner:JIANGSU ELECTRIC POWER CO
System and method for optimally controlling air compressor load
InactiveCN102230466BEliminate bad effectsImprove accuracyChemical industryPump controlChemical industryElectric machine
The invention discloses a system and a method for optimally controlling air compressor load and relates to the field of intelligent control on air compressors in the metallurgical and chemical industry. The system comprises a monitoring host, a signal acquisition unit, a guide vane control unit and a motor control unit, wherein the signal acquisition unit, the guide vane control unit and the motor control unit are respectively connected with the monitoring host; the signal acquisition unit monitors motor exciting current as well as the flow and pressure of the inlet and outlet of a pipe network when the air compressor operates; the monitoring host calculates the current revolving speed and output power of the motor according to field data on the basis of the characteristic curve of the air compressor device; the operation parameter of the air compressor is modified; an optimizing control order is output to the guide vane control unit and the motor control unit; and an inlet guide vane aperture and the motor exciting current are regulated to realize the purpose that the air compressor operates in a load energy-saving mode. According to the system and the method, bad influence of uncertain interference and non-linear factors on the constant-pressure speed regulation system of the air compressor can be effectively eliminated, and the control precision and dynamic quality of the system can be improved.
Owner:CHANGCHUN UNIV OF TECH
Reactive optimal online control method for analyzing mixed economic pressure difference and sensitivity
InactiveCN102856919BReduce optimization effectImprove voltage qualityReactive power adjustment/elimination/compensationReactive power compensationAutomatic controlEconomic pressure
The invention discloses a reactive optimal online control method for analyzing mixed economic pressure difference and sensitivity. The reactive optimal online control method comprises the steps of preparation of power grid data, calculation of an economic pressure difference optimal initial value, online sensitivity analysis and calculation, a P-Q load flow calculation method considering SVC (Static Var Compensator) static model, a construction method of a dynamic reactive power source, an iteration convergence criterion method and real-time automatic equipment control. With the adoption of the method, by monitoring the running state of a power grid and combining the actual running condition of the power grid, switching of a capacitor and an electric reactor equipment switch in a reactive optical control equipment, fine control on reactive power of SVC dynamic reactive compensation equipment and power plant reactive power generation regulation are realized, an optimization algorithm is improved, a new iteration solving mode is put forward, the dynamic reactive power source is built to carry out practical treatment, a solving method is selected for calculation of a layered node optimized voltage, and an iteration convergence criterion is improved, thus improving the convergence and the practicability of the economic pressure difference optimization algorithm.
Owner:HOHAI UNIV
Production process of aluminum profiles for automobile crash energy-absorbing parts and the produced aluminum profiles
The invention discloses a production process of an aluminum profile for automobile impact energy absorbing components and a produced aluminum profile, relates to the technical field of aluminum and aluminum alloy extrusion machining and heat treatment. The production process comprises the following steps that an aluminum alloy ingot is subjected to uniform annealing treatment, extrusion and quenching treatment, tensile treatment and aging treatment in sequence; then, the aluminum alloy ingot is cooled to 490-525 DEG C after the uniform annealing treatment, and extrusion is carried out again; and the aging treatment includes first, natural aging treatment and then secondary artificial aging treatment, the natural aging treatment time is carried out for 30-60 h, the heat preservation temperature of a first artificial aging stage is 100-120 DEG C, the heat preservation time is 2-3.5 h, the heat preservation temperature of a second artificial aging stage is 150-170 DEG C, and the heat preservation time is 8-12 h. By reasonably designing parameters of extrusion process and heat treatment process, the production process can improve tensile mechanical properties simultaneously without reducing the plasticity, so that the aluminum profile has better compression performance.
Owner:SHANDONG NANSHAN ALUMINUM +3
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