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55results about How to "Reduce harmonic content" patented technology
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Multiphase-multiphase direct AC-AC converter based on MMC and control method thereof
ActiveCN119582629AImprove scalabilityreduce in quantityAc-ac conversionAC - Alternating currentTransformer
The invention discloses a multi-phase-multi-phase direct-type AC-AC converter based on an MMC and a control method of the multi-phase-multi-phase direct-type AC-AC converter. The AC-AC converter provided by the invention comprises a modular multi-level converter and N single-phase three-winding transformers, the modularized multi-level converter comprises X phase units, the input side is provided with m ports and connected with a first alternating current system, and the output side is provided with N ports and connected with a second alternating current system. Each single-phase three-winding transformer comprises a first winding, a second winding and a third winding, the first windings of the N single-phase three-winding transformers are respectively connected with N phases of a second alternating current system, and the second windings are connected with N output side ports of an upper bridge arm of the modular multilevel converter; and the third winding is connected with N output side ports of the lower bridge arm of the modular multilevel converter. The AC-AC converter is based on the principle of synthesis of differential-mode and common-mode voltage components of MMC bridge arms, and is combined with a three-winding transformer with an anti-dotted terminal, so that the number of sub-modules of the M3C topology can be further reduced, and the AC-AC converter has good expansibility and is suitable for application scenes with various special requirements.
Owner:ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
Hybrid supercapacitor energy storage type current converter based on H bridge and operation method of hybrid supercapacitor energy storage type current converter
PendingCN119628453Aincrease capacityflexible controlBatteries circuit arrangementsSingle network parallel feeding arrangementsHybrid typePower grid
The invention relates to a hybrid supercapacitor energy storage type converter based on an H bridge and an operation method thereof, and the energy storage type converter comprises an upper bridge arm part and a lower bridge arm part. Each of the upper bridge arm part and the lower bridge arm part comprises three bridge arms, and each bridge arm is formed by connecting n H-bridge sub-modules and a bridge arm inductor in series; the upper bridge arm part is connected with a direct current bus, and the lower bridge arm part is connected with a grounding wire; the H-bridge sub-module comprises four switch elements and an energy storage unit, the energy storage unit is a hybrid super capacitor, the four switch elements form an H-bridge structure, and the hybrid super capacitor is connected to the two ends of the H-bridge structure in parallel. According to the invention, the dual functions of energy storage and current conversion in the AC-DC interconnected power grid can be realized under the cooperation of the control strategy, and various operation requirements in different scenes can be met.
Owner:JIAXING HENGGUANG ELECTRIC POWER CONSTR +2
Converter control circuit, converter and charging pile
PendingCN119483303AIncrease output currentquality improvementCharging stationsBatteries circuit arrangementsPower qualityControl cell
The embodiment of the invention relates to the technical field of electric power, in particular to a converter control circuit, a converter and a charging pile. The converter control circuit and the converter comprise the coupling unit, the power conversion unit, the bus unit and the control unit, one path of input of alternating current is converted into two paths or multiple paths of output by additionally arranging the coupling unit, in the multiple paths of output, current is isolated and equally divided, and the output current of the power conversion unit is improved. Meanwhile, the internal structure of the coupling unit suppresses the circulating current in the converter, and the circulating current loss in the power conversion unit is reduced. Furthermore, the power conversion unit is provided with a plurality of T-shaped three-level inversion units, so that a multi-level technology is realized, multi-voltage level is provided, and multi-level output can remarkably reduce harmonic content of output voltage and current, reduce current ripples and improve electric energy quality.
Owner:AUTEL UNITED CREATION SOFTWARE DEV CO LTD
Medium-voltage alternating-current bidirectional flexible interconnection device
PendingCN119448382Aachieve redistributionreduce pollutionElectric power transfer ac networkPhase currentsEnergy balancing
The invention provides a medium-voltage alternating-current bidirectional flexible interconnection device, which belongs to the technical field of power distribution and comprises a first phase-shifting transformer, a second phase-shifting transformer and a three-phase current source type flexible power transmission unit, the three-phase current source type flexible power transmission unit is located between the first phase-shifting transformer and the second phase-shifting transformer, and the first medium-voltage bus and the second medium-voltage bus are located at the lower end of the total drop of any two active high voltages; and the three-phase current source type flexible power transmission unit is used for performing bidirectional scheduling on the alternating current electric energy between the first medium-voltage bus and the second medium-voltage bus under the control instruction. When temporary uneven energy distribution occurs between transformers in a power distribution network of two power distribution transformers, energy redistribution can be realized, and energy balance can be realized to the greatest extent.
Owner:HUBEI CHUNTIAN ELECTRICAL TECH CO LTD
Composite control method for improving current control performance of three-phase LCL type grid-connected inverter
PendingCN122092697AImprove stabilityImprove robustnessSingle network parallel feeding arrangementsDc-ac conversion without reversalCapacitanceGrid connected inverter
The invention discloses a compound control method for improving the current control performance of a three-phase LCL type grid-connected inverter. The method comprises the following steps: establishing a system loop gain based on digital control delay; composite control is realized by adopting a mode of combining a capacitance current sampling modification mode and a delay compensation link, and the capacitance current sampling modification mode is used for shortening capacitance current sampling delay and comprises the steps of sampling grid-connected current at a wave trough of a triangular carrier wave, sampling capacitance current at a wave crest of the triangular carrier wave, and carrying out delay compensation on the grid-connected current. A modulation signal is loaded at the next grid-connected current sampling moment, and capacitance current sampling delay is shortened by half beat; the delay compensation link is used for compensating the influence of digital control delay, the influence of digital control delay is reduced by embedding a lead phase compensator in a capacitive current feedback loop, and the stability of the system and the quality of grid-connected current are improved. According to the invention, composite control is realized by adopting a mode of combining a capacitor current sampling modification mode and a delay compensation link addition mode.
Owner:WUHAN UNIV +1
Multi-standard power supply system and method for locomotive test
InactiveCN121770308ARealize power supplyImprove efficiencyDc-dc conversionElectric switchesTest powerPower grid
The invention discloses a multi-standard power supply system and method for a locomotive test, and relates to the technical field of test power supplies, and the structural design of the system is as follows: an input power supply is a three-phase alternating current 10kV power supply; the high-voltage switch K realizes access control and isolation of the system and a public power grid, the connection reactor L realizes energy buffering and inhibits switch ripples in output current, and the soft charging circuit pre-charges the three-stage converter. The three-level converter converts three-phase alternating current 10kV into DC1500 / 750V and outputs the DC1500 / 750V to the direct-current bus, one path of the direct-current bus supplies power to a subway vehicle test line, and the other path of the direct-current bus is inverted into single-phase alternating current 25kV through the output inverter and supplies power to a railway locomotive test line. According to the invention, alternating current test conditions of railway electric traction locomotive vehicles and direct current test conditions of subway vehicles can be satisfied, reliability and quality of power supply are ensured, repeated construction is reduced, and resource waste is avoided.
Owner:HUNAN RAILWAY PROFESSIONAL TECH COLLEGE +1
A boost type three-port energy storage inverter and control method thereof
ActiveCN117811402BGuaranteed uptimeReduce harmonic contentBatteries circuit arrangementsAc-dc conversionBattery chargePower flow
The present invention discloses a boost type three-port energy storage inverter and a control method thereof. The boost type three-port energy storage inverter includes a DC power supply, a battery, a bidirectional DC-DC converter, a boost inverter and an AC load; the inverter has three ports of input, output and energy storage, and has two working modes, and can convert the input DC source voltage or the single-stage high-gain boost of the battery into a stable, high-quality three-phase sinusoidal AC power; the control method is to centrally control the inverter and the battery charging and discharging control of the topology. The present invention improves the power density and efficiency of the energy storage system while improving the gain of the DC power supply; and adopts a control strategy to realize the bidirectional power flow between the ports, which can ensure the efficient operation of the energy storage system.
Owner:NANJING UNIV OF SCI & TECH
Rotor lamination for a single-pole electric machine and single-pole electric machine
This utility model discloses a rotor lamination for a unipolar motor and the unipolar motor itself. The rotor lamination has at least two circumferentially spaced magnetic slots on its end face. The outer circumferential surface of the rotor lamination has a groove. Each magnetic slot has a groove at both ends, which are respectively the entry end and the exit end. The groove near the entry end is the first groove, and the groove near the exit end is the second groove. The width of the first groove and the second groove along the circumferential direction of the rotor lamination and / or the depth along the radial direction of the rotor lamination are different. By setting the width and / or depth of the first groove and the second groove to be different, the width of the permanent magnet pole face towards the air gap can be adjusted, thereby reducing the leakage magnetic flux at both ends of the permanent magnet pole. It also makes the magnetic flux density of adjacent magnetic poles more symmetrical, and can reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque ripple.
Owner:NINGBO FOTILE KITCHEN WARE CO LTD
PWM wave optimization method and system based on VIENNA rectifier single-cycle control
PendingCN121966308AReduce harmonic contentImprove compatibilityAc-dc conversionPhase currentsVoltage vector
The invention provides a PWM wave optimization method and system based on VIENNA rectifier single-period control. The PWM wave optimization method comprises the steps that three-phase input current is sampled; determining the position of the corresponding PWM wave high level in the switching period according to the current direction of each phase; the method specifically comprises the following steps: for each PWM output channel, according to a phase current symbol associated with the PWM output channel, selecting to place a high level at two ends or in the middle of a switching period; and based on the determined PWM high level position and the calculated duty ratio, generating and outputting a PWM driving signal used for controlling a VIENNA rectifier switch tube. According to the method, PWM generation logic is redesigned, a non-optimal voltage vector combination used in traditional synthesis is abandoned, and three vectors (namely vectors corresponding to three vertexes of a small triangle where a target vector is located) closest to the target voltage vector are adopted for synthesis; according to the optimization, on the premise that the switching frequency is not increased and extra hardware cost is not increased, output current harmonics are remarkably reduced.
Owner:RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD
A high-precision core loss measurement device with multiple input waveforms
The present invention proposes a high-precision core loss measurement device with multiple input waveforms. The device includes a periodic square wave voltage generation module, a multi-waveform input generation module and a core loss measurement module. The periodic square wave voltage generation module generates a periodic square wave voltage, and the multi-waveform input generation module generates a variety of common voltage waveforms, and then generates current waveforms of different shapes on the primary winding of the magnetic core to be measured through different switch combinations and switch tube conduction timings. The core loss measurement module uses the inductance in the air-core transformer to partially compensate for the error amplification effect caused by the voltage and current phase angle difference caused by the inductance of the magnetic core to be measured. By calculating the compensation factor, the error caused under any input waveform is reduced to close to 0, thereby achieving high-precision measurement of the core loss. The present invention solves the problem of sensitivity to measurement phase error when measuring core loss using the dual-winding method, and can accurately measure the core loss at high frequencies.
Owner:SOUTH CHINA UNIV OF TECH
Rotor, motor, compressor and refrigeration equipment
ActiveCN119561281Aimprove distributionchange distributionMagnetic circuitElectric machineryControl theory
The invention discloses a rotor, a motor, a compressor and refrigeration equipment, the rotor comprises a permanent magnet and a rotor iron core, the rotor iron core is provided with a plurality of structural groups, each structural group comprises a mounting groove and n slits, n is a positive integer, the permanent magnet is arranged in the mounting groove, and the slits are arranged in the mounting groove. The slits are located between the mounting grooves and the outer peripheral surface of the rotor core, the width of each slit is Ln, the width of each mounting groove is b, the total width of the n slits is Sigma Ln, Sigma Ln = L1 + L2 +... + Ln, and the relationship between Sigma Ln and b is 0.1 < = Sigma Ln / b < = 0.5. According to the technical scheme, the magnetic line trend can be optimized, magnetic leakage is reduced, the permanent magnet utilization rate is improved, and the motor efficiency is improved.
Owner:GUANGDONG MEIZHI COMPRESSOR
A motor rotor structure for realizing better sinusoidal distribution of rotor flux linkage
The utility model relates to a kind of motor rotor structure for realizing rotor flux better sinusoidal distribution, belong to motor technical field, including protective shell, the protective shell is located in rotor, the rotor and protective shell are equipped with stator, the rotor is equipped with magnetic separation slot and magnetic filling slot, the magnetic filling slot is inserted and embedded permanent-magnetic strip, the permanent-magnetic strip includes permanent magnet I, permanent magnet II and permanent magnet III. Permanent magnet I and permanent magnet II, permanent magnet III superposition realizes rotor flux better sinusoidal distribution. Permanent magnet I, permanent magnet II, permanent magnet III and magnetic separation slot jointly form cross-axis magnetic circuit, due to the formation of reluctance torque superposition, thereby increase torque. By optimizing rotor magnetic pole shape, permanent magnet arrangement and auxiliary structure are realized, to reduce harmonic content, improve torque stability. Realize the good sinusoidal distribution of rotor flux, low motor torque ripple and slot effect, to improve the stability of motor operation, efficiency and control accuracy.
Owner:ZHEJIANG FANSHENG INTELLIGENT CONTROL TECH CO LTD
Power factor correction circuit adaptive control method and system
PendingCN119652108Astable outputefficient outputEfficient power electronics conversionPower conversion systemsHemt circuitsVoltage variation
The invention provides a power factor correction circuit adaptive control method and system, and the method comprises the steps: collecting an input voltage signal of a power factor correction circuit, obtaining a voltage control signal of the power factor correction circuit, and collecting a current sampling signal of the power factor correction circuit; the duty ratio of a switch driving signal is calculated based on the current sampling signal, the input voltage signal and the voltage control signal, the current sampling signal and the duty ratio are in a reverse growth relation, the input voltage signal and the duty ratio are in a reverse growth relation, and the current sampling signal and the input voltage signal are in a reverse growth relation. The voltage control signal and the duty ratio are in a homodromous growth relationship; and controlling the on-off of a switching device of the power factor correction circuit according to the duty ratio of the switching driving signal. According to the invention, the switch driving signal of the power factor correction circuit is adaptively adjusted based on the load change and the input voltage change, and the stable operation of the driven equipment is ensured.
Owner:SHANGHAI GREATWAY WELDING EQUIP CO LTD
A three-level full-bridge dual active bridge converter and neutral point potential balance control method
The application discloses a three-level full-bridge dual active bridge converter and a midpoint potential balance control method. The converter comprises a high-frequency transformer, a DC input voltage source is arranged on the primary side of the high-frequency transformer, and series-connected upper and lower capacitors are connected between the positive and negative electrodes of the DC input voltage source. Three-level half-bridge A and three-level half-bridge B are connected in parallel, a node between the upper and lower capacitors is connected to the midpoint of two clamping diodes of the two three-level half-bridges, the center point of the three-level half-bridge A is connected to one end of the primary side of the high-frequency transformer through a power transmission inductor, and the center point of the three-level half-bridge A is connected to the other end of the primary side of the high-frequency transformer through a DC isolation capacitor. In the control method, the primary side power device is divided into a fixed 50% duty ratio basic bridge arm and a non-symmetrical duty ratio adjusting bridge arm, a PI voltage balance loop is constructed by taking the voltage difference of the two capacitors as feedback, the duty ratio of the adjusting bridge arm is dynamically adjusted, the average value of the midpoint current is changed, and the midpoint potential balance is realized.
Owner:STATE GRID ELECTRIC POWER RES INST +1
A totem pole PFC inductor current correction method, system, medium and terminal
ActiveCN115395771BReduce harmonic contentRealize Correction CompensationEfficient power electronics conversionPower conversion systems
The present invention provides a totem pole PFC inductor current correction method and system, comprising: adjusting the control coefficient of the PI current compensator in the control circuit and the change law of the high-frequency carrier amplitude; the adjusted control circuit generates a modulation wave; and the modulation wave is input into the power circuit to realize the correction of the inductor current waveform. The present invention realizes the correction and compensation of the inductor current waveform by changing the reference voltage and the control coefficient of the current regulator, so that the inductor current waveform is closer to a sine wave, and the current harmonic content is effectively reduced.
Owner:SHANGHAI JIAOTONG UNIV
A method for compensating installation errors of Hall sensors in permanent magnet synchronous motors under disordered sequence
ActiveCN113972862BReduce positional deviationReduce harmonic contentMotor parameters estimation/adaptationElectronic commutatorsElectric machinePermanent magnet synchronous motor
A method for compensating installation errors of Hall sensors in a permanent magnet synchronous motor under disordered sequence includes the following steps: by energizing the three-phase stator windings in sequence and presetting a certain time, the back electromotive force of each phase is measured; the position of the rotor is obtained according to the back electromotive force value of each phase obtained in step 1; the value of the Hall sensor transferred to the corresponding sector is measured by injecting a fixed SVPWM, and the correct order of the Hall sensor is determined by the values of the six groups of Hall sensors in step 3; when the motor starts normally, the position deviation of the Hall sensor is compensated. This method solves the problem that the Hall signal detects a rotor position that is inconsistent with the actual position due to the disordered sequence of the Hall sensor of the motor, and the rotor cannot be transferred to the corresponding sector and cannot start normally; through the position deviation compensation method of the Hall sensor, the sinusoidality of the current can be improved, the position deviation of the Hall sensor can be reduced, and the harmonic content of the current can be reduced.
Owner:NINGBO ELECTRIC WING UAV CO LTD
Three-phase current type rectifier power supply control method and system for electrolyzing water to produce hydrogen
The present invention provides a three-phase current type rectifier power supply control method and system for hydrogen production by electrolysis of water, and relates to the field of power supply control. The method comprises: sectorizing a three-phase input voltage signal to obtain an initial even sector signal and an initial odd sector signal; calculating the number of carrier cycles in the initial even sector signal and the number of carrier cycles in the initial odd sector signal to determine a target carrier frequency; determining an even sector extension time based on the target carrier frequency to generate a target even sector signal and a target odd sector signal, thereby generating a triangular carrier signal; generating a switch drive signal of a three-phase current type rectifier power supply based on the triangular carrier signal and a modulation wave obtained based on the three-phase input voltage signal, and having the advantages of eliminating the distortion of the input current of the three-phase current type rectifier power supply at the sector switching point, reducing the harmonic content of the input current, reducing the output current ripple, and improving the efficiency of the rectifier power supply.
Owner:JIANGSU YINGTELI HYDROGEN ENERGY TECH CO LTD
A magnetic reluctance resolver and a rotor profile design method thereof
ActiveCN115881411BImprove output accuracyReduce difficultyWindingsTransformersExcitation currentMagnetic reluctance
The application relates to the technical field of reluctance rotary transformers, in particular to a reluctance rotary transformer and a rotor profile design method thereof, which comprises a stator and a rotor, eight stator teeth with the same parameters are arranged on the inner wall of the stator; a stator tooth winding is further arranged on the stator, the profile vector radius of the rotor is r(ptheta), r(ptheta)=r1+lambda-l(ptheta), wherein r1 is the base circle radius of the salient pole rotor, lambda is the distance from the inner surface of the stator tooth pole shoe to the base circle of the rotor, l(ptheta) is the air gap length between the inner surface of the stator tooth pole shoe and the rotor; wherein p is the pole pair number of the rotor, theta is the mechanical rotation angle of the rotor, A is the inner surface area of the stator tooth pole shoe, mu0 is the air permeability, I m is the coil excitation current, N is the excitation winding number, phi m is the average magnetic flux, and delta is the amplitude modulation coefficient. In the case that the shape of the stator is determined, the rotor profile is designed through air gap change, so that the harmonic content of the output signal of the reluctance rotary transformer can be well reduced.
Owner:HENAN YUHE ELECTRIC CO LTD
Flat wire short-pitch winding and motor
The utility model discloses a kind of flat wire short-pitch winding and motor, flat wire short-pitch winding includes the U-phase parallel branch circuit wound on motor stator, V-phase parallel branch circuit and W-phase parallel branch circuit;U-phase parallel branch circuit to the outgoing line end of U-phase parallel branch circuit is set in outermost flat wire layer, neutral point is set in innermost flat wire layer;U-phase parallel branch circuit to the outgoing line end of U-phase parallel branch circuit is set in innermost flat wire layer, neutral point is set in outermost flat wire layer;3Q stator slots are spaced between the neutral point of U-phase parallel branch circuit to the outgoing line end of U-phase parallel branch circuit;The number of the U-phase parallel branch circuit, V-phase parallel branch circuit and W-phase parallel branch circuit is equal and equidistantly arranged;The utility model ensures that each parallel branch circuit is evenly distributed, avoids circulation problem;By using short-pitch winding, the harmonic of motor operation is reduced.
Owner:JIANGSU RUIKONG ELECTRIC TECHNOLOGY CO LTD
Servo motor and servo motor position detection method
ActiveCN115459531BReduce harmonic contentImprove position detection accuracyMagnetic circuitStructural associationElectric machineHarmonics
The present invention relates to the technical field of servo motor position detection, and in particular to a servo motor and a servo motor position detection method. The method comprises: installing a choke ring, a multi-pole magnetic ring, and a circular magnetic sensor detection unit in the motor; applying an AC sinusoidal voltage excitation to the circular magnetic sensor detection unit; sensing the sinusoidal change of the magnetic field through the circular magnetic sensor detection unit, and outputting a standing wave signal; superimposing the standing wave signals output by each circular magnetic sensor detection unit to obtain a traveling wave signal; and detecting the traveling wave signal through a time-grid signal processing system to determine the position of the motor. The present invention can increase the output signal, improve the position detection accuracy and measurement sensitivity of the servo motor; reduce the harmonic components of the output signal, and improve the measurement accuracy; directly add the output electrical signals of each magnetic sensor, thereby avoiding the problem that a multiplier is required in the previous motor position detection method based on the time-grid technology, and the more probes there are, the more complicated the multiplication circuit will be.
Owner:GENERTEC GUOCE TIME GRATING TECH CO LTD
Control method for improving harmonic power grid input adaptability of Vienna rectifier
PendingCN121923463AImprove adaptabilityprevent overcurrentAc-dc conversion without reversalClassical mechanicsPower grid
The invention relates to the technical field of Vienna rectifiers, in particular to a control method for improving harmonic power grid input adaptability of a Vienna rectifier, which comprises the following steps of: performing coordinate transformation on acquired three-phase power grid voltage and input current to obtain voltage and current signals under a fundamental wave rotating coordinate system, extracting a fundamental wave current error signal, and calculating the harmonic power grid input adaptability of the Vienna rectifier; the method comprises the following steps: acquiring a current error component of each harmonic, converting the current error component into a rotating coordinate system corresponding to each specified harmonic to obtain the current error component of each harmonic, and in each harmonic rotating coordinate system, independently controlling the current error component of the corresponding harmonic by adopting a proportional-integral controller to generate a control voltage component of each harmonic; inversely transforming the control voltage component of each harmonic to a fundamental wave rotating coordinate system, and superposing to form a total harmonic compensation voltage; according to the invention, by adopting the control method of combining the self-adaptive loop parameters with the bus lifting strategy, the adaptability of the input current of the rectifier along with the power grid voltage under the harmonic power grid voltage is enhanced, so that the problem of overcurrent of the rectifier under different working conditions is avoided.
Owner:SHENZHEN SINEXCEL ELECTRIC
Sound system and television
ActiveCN222531823UReduce Harmonic DistortionImprove immersionTelevision system detailsStereophonic circuit arrangementsTotal harmonic distortionFrequency sound
The utility model relates to the technical field of multimedia equipment, and discloses a sound system and a television. The sound system comprises a plurality of sound channel sound boxes, wherein the plurality of sound channel sound boxes comprise a main sound channel sound box, a middle sound box, a sky sound box, a surround sound box and a mega bass sound box which are arranged at intervals; wherein the number of the mega bass sound boxes is two, and the two mega bass sound boxes are respectively arranged at two opposite sides of the middle sound box. According to the application, the low-frequency sound pressure of the sound system can be improved, the total harmonic distortion is reduced, and purer and more natural bass performance is provided, so that the immersion of the sound system is improved, and the use experience of the sound system of a user is improved.
Owner:QINGDAO HAIER MULTI MEDIA CO LTD +1
A flexible control method and system of an electric energy router and the electric energy router
PendingCN122315686AImprove operational efficiencyHigh control precisionData controlPower optimization
This application relates to the technical field of power optimization and dispatching, and in particular to a flexible control method, system, and power router for a power router. The method includes: when the power router is in operation, real-time acquisition of operating status data; calculation based on the operating status data using a preset flexible dispatching algorithm to obtain a dispatching decision result; adjustment of the power allocation and exchange boundaries between the power router's energy ports based on the dispatching decision result to obtain a flexible operating range; determination of the current operating mode based on the flexible operating range; and control of the power router to execute energy management actions corresponding to the current operating mode based on the current operating mode and operating status data. By constructing a flexible operating range, the system's adaptability and operational stability under varying operating conditions are improved, achieving rapid response in the time dimension and multi-port coordination in the spatial dimension for energy dispatching, comprehensively enhancing the operating efficiency and control accuracy of the power router.
Owner:HANGZHOU DANTONG TECHNOLOGY CO LTD
Control method and system of three-phase three-level AC / DC converter
ActiveCN119582579AImprove control effectincreased complexityAc-dc conversionAc network to reduce harmonics/ripplesFrequency waveTime delays
The invention discloses a control method and system of a three-phase three-level AC / DC converter. A multi-parallel quasi-resonance PR control method based on time delay phase compensation is adopted in the main body control link, time delay is converted into fixed phases needing to compensate fundamental waves and high order, and the influence of time delay between sampling and output on the system is improved. Aiming at the frequency fluctuation condition of the power grid side, the real-time frequency of the power grid is updated in real time through DSOGI-FLL, a frequency value is transferred to a phase compensation link, the compensation link is calculated through a new frequency value, a new transfer function is obtained after new parameter values are calculated, the new transfer function is connected into a main body control link in series, and the self-adaptive adjustment effect is achieved.
Owner:ZHEJIANG UNIV +1
New energy grid-connected control circuit and SST control method based on virtual synchronous machine
ActiveCN114400719Bachieve balancereduce the required powerSingle network parallel feeding arrangementsPolyphase network asymmetry elimination/reductionSynchronizerPower quality
The present invention discloses a new energy grid-connected control circuit and an SST control method based on a virtual synchronous machine. The present invention aims at connecting a new energy grid to a three-stage SST composed of an input stage, an isolation stage and an output stage, and arranges a new energy grid-connected control circuit based on a VSG at the output stage. Based on the circuit, current balance, active power and reactive power constant control under unbalanced voltage are performed through an SST control method, and a control strategy for grid stability is calculated through an SST control method based on a virtual synchronous machine under unbalanced voltage, thereby improving the power supply quality of the grid and improving the grid-connected current, voltage and power quality output by the SST output stage.
Owner:XINJIANG UNIVERSITY
Quick-release mounting type travel charging adapter
ActiveCN224083412Ureduce distractionsReduce disturbing noiseBatteries circuit arrangementsMagnetic/electric field screeningTravel chargePower switching
Owner:DONGGUAN ZHIYU IND TECH CO LTD
Double-separation-source multi-level converter and power supply system
ActiveCN119401822AReduce harmonic contentincrease flexibilityAc-dc conversionApparatus without intermediate ac conversionCapacitanceDC - Direct current
The invention relates to the technical field of new energy and energy conservation, in particular to a double-separation-source multi-level converter and a power supply system, and the converter mainly comprises a double-separation-source converter unit and a switched capacitor unit which are arranged in parallel. The switched capacitor unit is used for controlling the charging process or the discharging process of the direct-current capacitors corresponding to the capacitor switches at different positions according to the state of the accessed direct-current power supply and load requirements, and outputting different levels of voltages; the double-separation-source converter unit is used for accessing two direct-current power supplies; comprising two inverter loops, and the inverter loops are arranged corresponding to a direct-current power supply and used for rectifying and boosting different levels of voltage to generate alternating-current voltage meeting the load requirement. The converter can adapt to various different working scenes and load requirements, and the flexibility and adaptability of the system are improved.
Owner:XI AN JIAOTONG UNIV
Rotor structure and motor
PendingCN121886776AGuaranteed uptimereduce dosageMagnetic circuit rotating partsElectric machineClassical mechanics
The invention provides a rotor structure and a motor. The rotor structure comprises a rotor body and a plurality of magnetic bodies. The rotor body comprises a rotor yoke part and a plurality of rotor salient poles, the rotor salient poles are arranged on the outer circumferential surface of the rotor yoke part, and the plurality of rotor salient poles are arranged at intervals along the circumferential direction of the rotor yoke part; a mounting groove is formed between every two adjacent rotor salient poles; the magnetic bodies are arranged in the mounting grooves, and the plurality of magnetic bodies and the plurality of rotor salient poles are alternately arranged; grooves are formed in the side faces, making contact with the magnetic bodies, of the rotor salient poles. The motor comprises the rotor structure. The grooves are formed in the side faces, making contact with the magnetic bodies, of the salient poles of the rotor, magnetic leakage can be reduced, the sine degree of air gap flux density can be improved, the use amount of the magnetic bodies is reduced, meanwhile, counter electromotive force is effectively improved, the harmonic content of the counter electromotive force is reduced, and the operation performance of the motor can be improved, such as torque pulsation and noise reduction.
Owner:INVT POWER ELECTRONICS SUZHOU CO LTD
Stator assembly, manufacturing method thereof and motor
PendingCN119651941AImprove uniformityimprove noiseMagnetic circuit stationary partsManufacturing dynamo-electric machinesElectric machineStructural engineering
The invention provides a stator assembly and a manufacturing method thereof, and a motor, the stator assembly comprises a casing and a plurality of iron core blocks, each iron core block is assembled in the casing, each iron core block is spliced along the circumferential direction of the casing to form a stator core, each iron core block is provided with protrusions, the protrusions are distributed along the circumferential direction of the outer circumferential surface of the stator core at intervals, and the protrusions are arranged in the casing. A plurality of clamping grooves are formed in the machine shell, the clamping grooves are distributed in the circumferential direction of the machine shell at intervals, and the protrusions are clamped in the clamping grooves respectively. According to the invention, the stator iron core formed by the iron core blocks is automatically rounded by the aid of the casing, so that a mode of fixing the outer circle of the iron core through a tool is not needed, and the phenomenon that the outer diameter of the stator is rebounded to a certain degree or the outer circle of the stator is partially deformed due to the fact that the rounded tool is disassembled before the casing is sleeved is avoided. Therefore, the problem that the casing is difficult to sleeve or cannot be sleeved is solved.
Owner:GREE ELECTRIC APPLIANCE INC OF ZHUHAI +2
A low harmonic flat wire stator and motor
ActiveCN119070523BEliminate harmonicsImprove stabilityMagnetic circuit stationary partsWindings conductor shape/form/construction
The present invention provides a low harmonic flat wire stator and motor, including a stator core and a flat wire winding; the inner wall of the stator core is evenly provided with 12m stator slots along the circumferential direction, the stator slots are divided into 2n layers along the radial direction of the core, and the flat wire winding is wound in the stator slots; the flat wire winding includes two sets of three-phase windings, which are 30 degrees electrical angle apart in space, and the flat wire windings are arranged symmetrically in double short distances in the stator slots; each phase winding includes at least one parallel branch, each parallel branch includes a plurality of flat wire coils connected in series, each of the flat wire coils includes a forming end and two welding ends, and the two welding ends are respectively inserted into the 2i and 2i-1 layers of the stator slots, 1≤i≤n. While maintaining a small number of line types, the electrical balance of the motor, the balance of the number of winding layers, the low harmonic content, the high torque density, the small span of the cross-line end and the welding end, the high efficiency, the strong fault tolerance, and the connection scheme of the flat wire winding that is universal for different voltage platforms are achieved.
Owner:HOZI ELECTRIC DRIVE TECHNOLOGY (TONGCHENG) CO LTD