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30 results about "Dc bus voltage regulation" patented technology
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HID buck and full-bridge ballast control IC
InactiveUS20060113922A1Electric light circuit arrangementGas discharge lamp usageSingle stageConstant power
An integrated circuit controls a power converter that includes single stage buck-boost converter and a switching full bridge that may be used to drive an HID lamp. The single stage buck-boost converter reduces the complexity and parts count of the power converter, or electronic ballast, while permitting PFC and DC bus voltage regulation under control of the integrated circuit to maintain constant power on the HID lamp. The integrated circuit simplifies the design of power converters and electronic ballasts in particular, while reducing part count, complexity and cost in conjunction with the single stage buck-boost converter and the full bridge switching circuit.
Owner:INTERNATIONAL RECTIFIER COEP
HID buck and full-bridge ballast control IC
InactiveUS7525256B2Electric light circuit arrangementGas discharge lamp usageSingle stageConstant power
An integrated circuit controls a power converter that includes single stage buck-boost converter and a switching full bridge that may be used to drive an HID lamp. The single stage buck-boost converter reduces the complexity and parts count of the power converter, or electronic ballast, while permitting PFC and DC bus voltage regulation under control of the integrated circuit to maintain constant power on the HID lamp. The integrated circuit simplifies the design of power converters and electronic ballasts in particular, while reducing part count, complexity and cost in conjunction with the single stage buck-boost converter and the full bridge switching circuit.
Owner:INTERNATIONAL RECTIFIER COEP
High intensity discharge lamp ballast circuit
ActiveUS7190151B2Operation be completeElectrical apparatusElectric lighting sourcesConstant powerSingle stage
An integrated circuit controls a power converter that includes single stage buck-boost converter and a switching full bridge that may be used to drive an HID lamp. The single stage buck-boost converter reduces the complexity and parts count of the power converter, or electronic ballast, while permitting PFC and DC bus voltage regulation under control of the integrated circuit. The integrated circuit also provides all the drive signals to operate the switching full bridge circuit to maintain constant power on the HID lamp. A wait timer provides an interval of time between restart attempts for the HID lamp to permit the lamp to cool so that high hot restart voltages are avoided. The integrated circuit simplifies the design of power converters and electronic ballasts in particular, while contributing to reducing part count, complexity and cost in conjunction with the single stage buck-boost converter.
Owner:INFINEON TECH AMERICAS CORP
DC bus voltage adjusting and MPPT unified control system and method of photovoltaic microgrid
ActiveCN104882909AImprove grid connection efficiencySingle network parallel feeding arrangementsPhotovoltaic energy generationMicrogridGrid connected inverter
The invention discloses a DC bus voltage adjusting and MPPT unified control system and method of a photovoltaic microgrid, for the purposes of realizing unified control of MPPT control and DC bus voltage adjustment of a photovoltaic grid-connected inverter, improving the photovoltaic grid-connected efficiency and decreasing the operation cost of a photovoltaic microgrid system. According to the invention, unified control of the DC bus voltage adjustment and MPPT of the photovoltaic grid-connected inverter free from a DC / DC link and an energy storage apparatus comprising a DC / DC link under the condition of a common DC bus can be realized, the grid-connected efficiency of the photovoltaic inverter is improved, and the system and method provided by the invention is applied to the field of the photovoltaic microgrid.
Owner:STATE GRID CORP OF CHINA +3
Grid-connected photovoltaic inverter device and control method for improving conversion efficiency thereof
InactiveCN101980436ANo additional costIncreased efficiency across the full load rangeSingle network parallel feeding arrangementsPhotovoltaic energy generationLoop controlGrid connected inverter
The invention discloses a grid-connected photovoltaic inverter device and a control method for improving conversion efficiency thereof and belongs to the field of inverter control. The device comprises N grid-connected photovoltaic inverters, wherein a voltage outer loop control circuit (3) of each grid-connected photovoltaic inverter comprises a bus voltage sampling circuit (301), first and second bus voltage regulators (302 and 303), first and second amplitude limiting circuits (304 and 305) and three voltage loops. The control method comprises that: given voltage in different grades is respectively set for the bus voltage regulators of the plurality of grid-connected inverters; along with the increase of the input power, the inverters work in turn according to the given voltage, and the light load efficiency is improved by reducing the number of the operating inverters under the condition of light load; and different set values and output amplitude limiting values are applied to a linear bus voltage regulator of a single grid-connected inverter so as to ensure that the inverters can operate at the highest efficiency preferentially under different power grades, and the overall efficiency of the system is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method for performing interphase current sharing of iLLC resonant converter and prolonging power-down maintenance time
ActiveCN109818502AImprove efficiencyReduced turn-off lossEfficient power electronics conversionApparatus with intermediate ac conversionResonant cavityElectricity
The invention provides an iLLC resonant converter. The iLLC resonant converter comprises two LLC resonant converters, a digital controller and two switch control inductors. The power transformers of the two LLC resonant converters are respectively provided with an auxiliary winding, wherein the two switch control inductors are respectively connected with the auxiliary winding in parallel, the parameters and the structure of the two LLC resonant converters are the same, the input ends of the two LLC resonant converters are connected in parallel, the output ends of the two LLC resonant converters are also connected in parallel, and the parameters and the structure of the two switch control inductors are the same. According to the resonant converter provided by the invention, respective output current and common input voltage of the two LLC resonant converters are sampled through the digital controller. The phase angle of the inductor is controlled by the operation adjusting switch to realize current sharing of the resonant cavity current, the direct current voltage gain of the resonant cavity can be adjusted according to the direct current bus voltage during input power failure, andthe power failure maintenance time of the converter is prolonged.
Owner:东莞市全普电气科技有限公司
Multi-objective collaborative optimization control method applied to direct-current three-level converter
ActiveCN111049381AImprove reliabilityThe principle is simpleDc network circuit arrangementsDc-dc conversionCapacitanceMicrogrid
The invention discloses a multi-objective collaborative optimization control method applied to a direct-current three-level converter. The neutral-point voltage fluctuation can be suppressed while thevoltage regulation precision of a direct-current bus can be improved. The method comprises the following steps: 1, flexibly adjusting input power to meet the requirement of multi-port energy storage;2, controlling the voltage of an output-side direct-current bus to be stable; and 3, carrying out voltage-sharing control on the voltage-dividing capacitor at the output side. The method is a multi-objective collaborative optimization control method and is suitable for a direct-current microgrid system containing a direct-current three-level converter.
Owner:TIANJIN UNIV
Inverter and direct current bus voltage regulating method thereof and application using the same
ActiveUS20150070956A1Improve conversion efficiencyImprove stabilityEfficient power electronics conversionAc-dc conversionPower inverterVoltage regulation
An inverter and a direct current (DC) bus voltage regulating method thereof are provided. The inverter includes a resonant conversion circuit, an inverting circuit, a first control circuit and a second control circuit. The resonant conversion circuit receives a DC input voltage and converts the same into a DC bus voltage. The inverting circuit couples to the resonant conversion circuit, and configured to convert the DC bus voltage into an AC output voltage. The first control circuit is configured to control operations of the resonant conversion circuit, where the first control circuit calculates a best working voltage of the resonant conversion circuit based on the DC input voltage and a resonant frequency of the resonant conversion circuit. The second control circuit controls operations of the inverting circuit, where the second control circuit receives the best working voltage calculated by the first control circuit and regulates the DC bus voltage accordingly.
Owner:FSP POWERLAND TECH +1
LED driving circuit and dimming control method thereof
PendingCN110602822AStable brightnessReduce or even eliminate the phenomenon of "flashing light"Electrical apparatusElectroluminescent light sourcesSilicon-controlled rectifierReference current
The invention discloses an LED driving circuit and a dimming control method thereof. The driving circuit is connected with a dimmer so as to acquire an AC input voltage through chopping and is connected with an LED to control a load current passing through the LED. The driving circuit comprises a current control circuit, wherein the current control circuit is used for controlling the load circuitpassing through the LED and adjusting continuous time of the load current in a half-power frequency period according to a DC bus voltage so as to achieve dimming, the current control circuit is used for acquiring a conduction angle range of the dimmer according to a detection value of the load current and selectively works in one of an open-loop mode and a closed-loop mode, the current control circuit is used for maintaining the load current at a reference current in the open-loop mode, and the current control circuit is used for adjusting the load current according to the negative feedback ofthe DC bus voltage in the closed-loop mode. The conduction state of a transistor is controlled according to different modes by the LED driving circuit with regard to different conduction angles of silicon-controlled rectifier in the dimmer, dimming brightness stability can be compatible, and the response speed is adjusted.
Owner:HANGZHOU SILAN MICROELECTRONICS
High-speed torque ripple restraining device based on direct current bus voltage adjustment and restraining method thereof
InactiveCN104410340AReduce sizeSuppression of torque rippleTorque ripple controlPower inverterControl theory
The invention discloses high-speed torque ripple restraining device based on direct current bus voltage adjustment. The high-speed torque ripple restraining device comprises a Boost converter, a voltage type inverter and a controller, wherein the output end of the voltage type inverter is connected with a three-phase winding of a brushless direct current motor; the input end of the controller is connected with a Hall signal output end of the brushless direct current motor; the output end of the controller is connected with each of the voltage type inverter and the Boost converter and is used for controlling working states of the voltage type inverter and the Boost converter; the output end of the Boost converter is connected with the input end of the voltage type inverter. According to the high-speed torque ripple restraining device, torque ripple can be restrained by a mode of adjusting direct current bus voltage. The invention also discloses a restraining method for the high-speed torque ripple restraining device based on the direct current bus voltage adjustment.
Owner:JIANGSU UNIV OF SCI & TECH
Direct-current micro-grid secondary voltage regulation system and control method thereof
ActiveCN105720572AGuaranteed cost-effective operationQuality improvementDc source parallel operationElectrical batteryVoltage regulation
The invention relates to a direct-current micro-grid voltage regulation system and particularly relates to a direct-current micro-grid secondary voltage regulation system and a control method thereof, aiming at the solving the problem that voltage of a direct-current bus cannot be regulated to a rated value by a traditional direct-current micro-grid droop voltage regulation system. The direct-current micro-grid voltage regulation system comprises a vanadium battery energy storage system and a voltage regulation controller, wherein the vanadium battery energy storage system comprises a vanadium battery, a bidirectional DC / DC (Direct Current / Direct Current) converter and a vanadium battery detector; the vanadium battery is connected with the direct-current bus through the bidirectional DC / DC converter; the vanadium battery detector is connected with the vanadium battery; and the voltage regulation controller is connected with the direct-current bus, the vanadium battery detector, the bidirectional DC / DC converter in the vanadium battery energy storage system, a second bidirectional DC / DC converter in a mixed energy storage system, and a bidirectional DC / AC (Direct Current / Alternating Current) converter in a connected-grid system. The direct-current micro-grid secondary voltage regulation system is suitable for direct-current micro-grids.
Owner:TAIYUAN UNIV OF TECH
Secondary voltage regulation method suitable for DC microgrid
ActiveCN110729713AEasy to controlImprove stabilityDc network circuit arrangementsElectric power transfer ac networkMicrogridCurrent distribution
Owner:HANGZHOU DIANZI UNIV
Grid-side current balancing control method of unified power quality conditioner
ActiveCN106936143AImprove balanceSmall voltage fluctuationPolyphase network asymmetry elimination/reductionPolyphase network asymmetry reductionPower qualityLow-pass filter
The invention relates to a grid-side current balancing control method of a unified power quality conditioner. The method comprises: a three-phase grid voltage, a load voltage, a load current are converted from a three-phase ABC alternating-current coordinate system to a two-phase dq rotation coordinate system and phase information needed by coordinate conversion is obtained by phase locking of a grid voltage; after coordinate conversion, alternating-current components and direct-current components of the grid voltage, the load voltage, and the load current are obtained, and after processing by a low-pass filter, alternating-current components in variables are filtered; according to the filtered direct-current components, a grid-side current fundamental current amplitude is calculated; and the grid-side current fundamental current amplitude and a direct-current bus voltage adjustment result are superposed to obtain a three-phase grid-side reference current amplitude. With the method provided by the invention, the grid-side three-phase current balancing degree can be reduced; the direct-current bus voltage fluctuation can be reduced; the dynamic response speed of the system can be increased; and defects of poor steady-state control effect and slow dynamic response speed of the direct-current bus voltage loop can be overcome.
Owner:YANSHAN UNIV
Inverter for converting direct current power into alternating current power and direct current bus voltage regulating method thereof and application using the same
ActiveUS9287803B2Improve conversion efficiencyImprove stabilityEfficient power electronics conversionDc-dc conversionVoltage regulationEngineering
An inverter and a direct current (DC) bus voltage regulating method thereof are provided. The inverter includes a resonant conversion circuit, an inverting circuit, a first control circuit and a second control circuit. The resonant conversion circuit receives a DC input voltage and converts the same into a DC bus voltage. The inverting circuit couples to the resonant conversion circuit, and configured to convert the DC bus voltage into an AC output voltage. The first control circuit is configured to control operations of the resonant conversion circuit, where the first control circuit calculates a best working voltage of the resonant conversion circuit based on the DC input voltage and a resonant frequency of the resonant conversion circuit. The second control circuit controls operations of the inverting circuit, where the second control circuit receives the best working voltage calculated by the first control circuit and regulates the DC bus voltage accordingly.
Owner:FSP POWERLAND TECH +1
Direct-current bus voltage regulation method and device of two-stage converter
ActiveCN111327189AReduce voltage stressReduced maximum voltage spikesDc-dc conversionElectric variable regulationHemt circuitsControl theory
The invention discloses a DC bus voltage regulation method and device of a two-stage converter. The bus voltage of a DCDC converter is adjusted according to the two dimensions of the output voltage and the output current. The bus voltage in the DCM state is far lower than the bus voltage in the full-load CCM state; therefore, the voltage stress of the output diode in the DCM state can be reduced,so the maximum voltage peak of the diode is especially reduced, and the voltage peak of the power MOS tube in the DCM state can be reduced, thereby improving the reliability of the circuit, reducing the number of diode absorption circuits, selecting a diode with a lower grade, and reducing the cost of the circuit.
Owner:BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +2
A kind of DC bus voltage regulation control method of microgrid system
ActiveCN107171309BGuaranteed uptimeStable operationLoad balancing in dc networkPower gridControl theory
The invention discloses a DC bus voltage stabilization control method for a micro-grid system. The DC bus voltage stabilization control method comprises the steps of: constructing DC micro-grid models in an energy storage system charging mode and an energy storage system discharging mode based on structural characteristics and operating characteristics of a DC micro9-grid; acquiring mixed potential function models in the charging mode and the discharging mode according to the DC micro-grid models; carrying out voltage stabilization analysis on the mixed potential function models to obtain voltage stabilization control design criteria corresponding to the charging mode and the discharging mode; and setting voltage controller parameters of corresponding convertors according to the obtained voltage stabilization control design criteria, so that the micro-grid system operates in a voltage-stabilized manner. The DC bus voltage stabilization control method for the micro-grid system can ensure that the bus voltage in the DC micro-grid system is always in a stable operating state, and improve the safety performance of system operation.
Owner:北京汇思慧能科技有限公司
A DC microgrid secondary voltage regulation system and its control method
ActiveCN105720572BGuaranteed cost-effective operationQuality improvementDc source parallel operationMicrogridElectrical battery
The invention relates to a direct-current micro-grid voltage regulation system and particularly relates to a direct-current micro-grid secondary voltage regulation system and a control method thereof, aiming at the solving the problem that voltage of a direct-current bus cannot be regulated to a rated value by a traditional direct-current micro-grid droop voltage regulation system. The direct-current micro-grid voltage regulation system comprises a vanadium battery energy storage system and a voltage regulation controller, wherein the vanadium battery energy storage system comprises a vanadium battery, a bidirectional DC / DC (Direct Current / Direct Current) converter and a vanadium battery detector; the vanadium battery is connected with the direct-current bus through the bidirectional DC / DC converter; the vanadium battery detector is connected with the vanadium battery; and the voltage regulation controller is connected with the direct-current bus, the vanadium battery detector, the bidirectional DC / DC converter in the vanadium battery energy storage system, a second bidirectional DC / DC converter in a mixed energy storage system, and a bidirectional DC / AC (Direct Current / Alternating Current) converter in a connected-grid system. The direct-current micro-grid secondary voltage regulation system is suitable for direct-current micro-grids.
Owner:TAIYUAN UNIV OF TECH
Phase-to-phase current sharing of illc resonant converter and the method of prolonging power-down maintenance time
ActiveCN109818502BImprove efficiencyReduced turn-off lossEfficient power electronics conversionApparatus with intermediate ac conversionPhase currentsResonant cavity
Provided is an iLLC resonant converter, comprising two LLC resonant converters, a digital controller and two switch control inductors. Power transformers of the two LLC resonant converters are respectively provided with an auxiliary winding, the two switch control inductors are respectively connected in parallel to the auxiliary windings, the parameters and structures of the two LLC resonant converters are the same, input ends of the two LLC resonant converters are connected in parallel, and output ends thereof are also connected in parallel, and the parameters and structures of the two switch control inductors are the same. According to the resonant converter provided in the present invention, the respective output currents and common input voltage of two LLC resonant converters are sampled by means of a digital controller, the phase angle of switch control inductors is adjusted through operation to realize current sharing of a resonant cavity, and the direct-current voltage gain of the resonant cavity can be adjusted according to the voltage of a direct-current bus during input power-down, thereby prolonging the power-down hold-up time of the converter.
Owner:东莞市全普电气科技有限公司
Unified control system and method for photovoltaic microgrid DC bus voltage regulation and mppt
ActiveCN104882909BImprove grid connection efficiencySingle network parallel feeding arrangementsPhotovoltaic energy generationMicrogridControl system
Owner:STATE GRID CORP OF CHINA +3
Bus capacitor pre-charging circuit and method, frequency converter and air conditioning equipment
PendingCN111669038AAvoid excessive burnout situationsFlexible adjustment of charging currentBatteries circuit arrangementsAc-dc conversionFrequency changerCapacitance
The invention discloses a bus capacitor pre-charging circuit and method, a frequency converter and air conditioning equipment. The circuit comprises a charging module and a controller, wherein the input end of the charging module is connected with an alternating-current power supply, the output end is connected with a direct-current bus, and the charging module is used for outputting changed current; the input end of the controller is connected with a direct-current bus, the output end of the controller is connected with the charging module, and the controller is used for adjusting current output by the charging module according to the voltage of the direct-current bus. According to the invention, the charging current can be flexibly adjusted, the situation that a cement resistor is burntdown due to overlarge current caused by the fact that direct-current voltage is completely applied to the two ends of the cement resistor at the power-on moment is avoided, and the safety is improved.
Owner:GREE ELECTRIC APPLIANCES INC
A grid-side current balance control method for a unified power quality conditioner
ActiveCN106936143BImprove balanceSmall voltage fluctuationPolyphase network asymmetry elimination/reductionPolyphase network asymmetry reductionLow-pass filterReference current
Owner:YANSHAN UNIV
A control method for a single-phase single-stage boost inverter
ActiveCN113224964BAvoid output waveform distortion problemsReduce voltage stressAc-dc conversionCarrier signalAmplitude control
Owner:NANTONG UNIVERSITY
A DC microgrid power distribution control method
ActiveCN110365004BPreserve the plug-and-play featurePrecise Power DistributionDc network circuit arrangementsMicrogridDistribution control
The invention relates to a direct current microgrid technology, in particular to a power distribution control method of a direct current microgrid. The direct-current microgrid comprises n direct current power supplies, wherein each direct current power supply is connected with a direct current bus through a DC-DC converter by a connecting wire, and a load is connected to the direct-current bus. The power distribution control method comprises the following steps of: setting a direct current bus voltage controller and a DC-DC converter controller, taking the error of a reference value and the measured value of the direct current bus voltage as the input of the direct current bus voltage controller, taking the output of the direct current bus voltage controller as a compensation voltage, transmitting a compensation voltage to each DC-DC converter through a communication channel, adding the compensation voltage to a droop control equation of the DC-DC converter controller, and compensating the cycle-by-cycle deviation of power distribution to eliminate the output voltage drop caused by droop control. The method simultaneously achieves power distribution and direct current bus voltageregulation, and has the advantages of the simple achievement, reservation of the plug and play characteristic of the microgrid and the like.
Owner:GUANGZHOU UNIVERSITY
DC bus voltage regulation method and device for two-stage converter
ActiveCN111327189BReduce voltage stressReduced maximum voltage spikesDc-dc conversionElectric variable regulationVoltage spikeHemt circuits
The invention discloses a DC bus voltage regulating method and device for a two-stage converter, which regulates the bus voltage of the DCDC converter according to the two dimensions of output voltage and output current to ensure that the bus voltage in the DCM state is far lower than that in the full-load CCM state The bus voltage at the time can reduce the voltage stress of the output diode in the DCM state, especially reduce the maximum voltage spike of the diode, and also reduce the voltage spike of the power MOS tube in the DCM state, thereby improving the reliability of the circuit and reducing For the diode snubber circuit, a diode with a lower grade can also be selected to reduce the circuit cost.
Owner:BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +2
DSVG double-loop control method
InactiveCN106532731AStable outputImprove currentReactive power adjustment/elimination/compensationReactive power compensationEngineeringDirect current
A DSVG double-loop control method provided by the invention comprises: a direct current bus voltage regulation is taken as a voltage outer ring, and a regulator output and the load current are taken as a current inner ring, and after the given voltage outer ring and current inner ring is compared to the current feedback, driving signals are generated through the regulator. The DSVG double-loop control method can provide energy and rapidly track the load current, ensure the stable output of the direct current bus voltage and improve the current and voltage waveform.
Owner:国船电气(武汉)有限公司
Distributed Unified Control Method for Medium and Low Voltage DC Power Distribution System
ActiveCN110212517BAchieve unified controlSimple control structureLoad balancing in dc networkDc source parallel operationLow voltageDistribution power system
The invention discloses a decentralized unified control method for a medium and low voltage direct current power distribution system. The method includes two parts: a decentralized control method based on a DC bus voltage signal and a unified control method for a DC transformer: a decentralized control method based on a DC bus voltage signal The control method is that the photovoltaic, energy storage, and fuel cell units on the DC bus adjust their respective operating modes according to the voltage range of the DC bus voltage to jointly maintain the stability of the DC bus voltage; the unified control method of the DC transformer is in the voltage droop control link On the basis of the above, the displacement control link is added to obtain power control, medium-voltage DC bus voltage regulation function, and low-voltage DC bus voltage regulation function; when the system operation scene changes, the DC transformer does not need to switch the control mode. The invention realizes the integrated control of the medium and low voltage direct current power distribution system, has no communication link, is easy to implement, has high reliability, and realizes the stable operation of the medium and low voltage direct current power distribution system.
Owner:SOUTHEAST UNIV
Grid-connected photovoltaic inverter device and control method for improving conversion efficiency thereof
InactiveCN101980436BNo additional costIncreased efficiency across the full load rangeSingle network parallel feeding arrangementsPhotovoltaic energy generationPower inverterLoop control
The invention discloses a grid-connected photovoltaic inverter device and a control method for improving conversion efficiency thereof and belongs to the field of inverter control. The device comprises N grid-connected photovoltaic inverters, wherein a voltage outer loop control circuit (3) of each grid-connected photovoltaic inverter comprises a bus voltage sampling circuit (301), first and second bus voltage regulators (302 and 303), first and second amplitude limiting circuits (304 and 305) and three voltage loops. The control method comprises that: given voltage in different grades is respectively set for the bus voltage regulators of the plurality of grid-connected inverters; along with the increase of the input power, the inverters work in turn according to the given voltage, and the light load efficiency is improved by reducing the number of the operating inverters under the condition of light load; and different set values and output amplitude limiting values are applied to a linear bus voltage regulator of a single grid-connected inverter so as to ensure that the inverters can operate at the highest efficiency preferentially under different power grades, and the overall efficiency of the system is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Motor driving system based on bidirectional interleaved parallel DC-DC inverter
ActiveCN112542978AReduce the impactImprove current waveformTorque ripple controlAC motor controlControl signalPermanent magnet synchronous motor
The invention discloses a motor driving system based on a bidirectional interleaved DC-DC inverter. According to the system, a bus voltage loop is additionally arranged on the basis of a current loopsum. The motor driving system comprises an acquisition module, a voltage loop controller and a direct-current bus voltage regulator, and is characterized in that the bus voltage acquisition module acquires a direct-current bus voltage Uout of a permanent magnet synchronous motor; the voltage loop controller extracts a rotating speed acquisition value of the permanent magnet synchronous motor froma speed loop, subtracts the rotating speed acquisition value from a given rotating speed, and inputs a difference value into a voltage control model; the voltage control model generates a bus voltagecontrol target Uref by taking the minimum total harmonic distortion rate THD as a target, and outputs the bus voltage control target Uref to the direct-current bus voltage regulator; the direct-current bus voltage regulator generates control signals of four switching devices in an inverter by taking the difference value of Uref and Uout as 0 as a control target; and the inverter generates dynamically regulated bus voltage and applies the bus voltage to a power driving module to drive the permanent magnet synchronous motor. According to the invention, the current ripple torque can be reduced, and the precision and stability of low-speed operation of the motor are improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Brushless doubly-fed power generation system
PendingCN112910146ASimplify complexityGuaranteed uptimeGenerator control circuitsSingle network parallel feeding arrangementsFrequency changerAC - Alternating current
The invention discloses a brushless doubly-fed power generation system, and belongs to the field of motor power generation. The system comprises a brushless doubly-fed generator including a power winding and a control winding, an AC-DC-AC frequency converter, an uncontrolled rectification module and an inversion module, wherein the AC-DC-AC frequency converter is connected with the control winding and is used for establishing and maintaining an initial DC bus voltage and adjusting a frequency and a voltage of the control winding; the frequency of the power winding is kept constant under the condition of a variable rotating speed, and the power distribution relation between the control winding and the power winding is adjusted when the capacity of the power winding is insufficient; the uncontrolled rectification module is connected with the power winding and used for rectifying the three-phase alternating current generated by the power winding into a target direct current bus voltage; and the inversion module is connected with the uncontrolled rectification module and is used for inverting the target direct current bus voltage into three-phase alternating current meeting a power utilization quality standard so as to supply power to a connected load or be connected with a main power grid for grid-connected power supply. According to the invention, the DC bus voltage can be kept stable, the dynamic response capability of the system is improved, the complexity of the system is simplified, and the debugging time is shortened.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Power grid side voltage fluctuation suppression system and method and storage medium
PendingCN114709842ASuppress fluctuationsAvoid damageAC motor controlPower oscillations reduction/preventionPower gridControl theory
The invention provides a power grid side voltage fluctuation suppression system and method and a storage medium. The power grid side voltage fluctuation suppression system comprises a voltage acquisition module, a voltage phase locking module, a current acquisition module, a coordinate transformation module, a DC voltage acquisition module, a DC bus voltage regulation module, an active current regulation module, a reactive current given value calculation module, a reactive current regulation module, an inverse coordinate transformation module and a PWM modulation module. According to the power grid side voltage fluctuation suppression system and method and the storage medium, the fluctuation of the power grid side voltage during the temperature rise test of the asynchronous motor can be suppressed, and other loads powered by the power grid are effectively prevented from being damaged.
Owner:SIEMENS ELECTRICAL DRIVES SHANGHAI
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