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38results about How to "Suppresses common mode current" patented technology
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Grid-tie inverter
ActiveCN102714469ASuppresses common mode currentDc-ac conversion without reversalGrid-tie inverterThree-phase
The disclosed grid-tie inverter is provided with: a single-phase or three-phase inverter (1) which changes a DC voltage supplied from a DC power supply (5) to a pulse-width modulated voltage; a first capacitor circuit (41) which is connected so as to form a neutral point (c) on the input side of the inverter (1); a second capacitor circuit (42) which is connected so as to form a neutral point (f) on the output side of the inverter (1); a common mode current bypass channel (g) which is formed by connecting the neutral point (c) on the first capacitor circuit (41) and the neutral point (f) on the second capacitor circuit (42); a grounded capacitor (11) which is provided between the bypass channel (g) and the earth; a first common mode choke coil unit which is provided with common mode choke coils (31, 32) in at least one location between the first capacitor circuit (41) and the inverter (1) or the inverter (1) and the second capacitor circuit (42), and which uses the inverter (1) to suppress generated common mode current; and an output filter (2) which converts the pulse-width modulated voltage waveform output from the inverter (1) to a sinusoidal single-phase or three-phase AC voltage.
Owner:KK TOSHIBA
Single-phase non-isolation type photovoltaic grid-connected inverter and control method
InactiveCN102157955AImprove power conversion efficiencyReduce lossAc-dc conversionSingle network parallel feeding arrangementsSingle phasePower inverter
The invention discloses a single-phase non-isolation type photovoltaic grid-connected inverter and a control method. The photovoltaic grid-connected inverter comprises a full-bridge circuit, a control circuit and a fly-wheel diode, wherein the control circuit is used for controlling conduction and cut-off of all switching tubes in the full-bridge circuit so as to convert direct current voltage generated by a photovoltaic array of the full-bridge circuit to sine wave voltage required for grid connection; and the fly-wheel diode is used for providing a fly-wheel loop so as to thoroughly disconnect the input side from a power grid. The photovoltaic grid-connected inverter can effectively inhibit common-mode current (namely drain current) of the single-phase non-isolation type photovoltaic grid-connected inverter and improve the electrical energy conversion efficiency of the inverter.
Owner:TBEA SUNOASIS +1
Efficient no-transformer single phase photovoltaic grid-connected inverter
InactiveCN102983765ASuppresses common mode currentEasy to controlDc-dc conversionPhotovoltaic energy generationGrid connected inverterPower grid
The invention provides an efficient no-transformer single phase photovoltaic grid-connected inverter and relates to an inverter. The efficient no-transformer single phase photovoltaic grid-connected inverter comprises a solar photovoltaic array (1), a booster circuit (2), a direct current-alternating current (DC-AC) inverter (3), a relay (4), a power grid (5) and a leak current loop (6), the solar photovoltaic array (1), the booster circuit (2), the direct current-alternating current (DC-AC) inverter (3), the relay (4) and the power grid (5) are connected with one another in sequence, the relay (4) is connected with the power grid (5), besides the booster circuit (2) is connected with the leak current loop (6), and the leak current loop (6) is connected with the power grid (5). The efficient no-transformer single phase photovoltaic grid-connected inverter can effectively restrain a common mode current, and the highest efficiency of a topological structure can be up to 96%.
Owner:艾伏新能源科技(上海)股份有限公司
Magnetic integrated inductor
ActiveCN104282412ASuppresses common mode currentAvoid bad consequencesTransformers/inductances magnetic coresInductance with magnetic coreInductorMagnetic core
The invention relates to a magnetic integrated inductor. The magnetic integrated inductor comprises an upper yoke magnetic core, a lower yoke magnetic core, at least two middle column magnetic cores with windings and at least one high-magnetoconductivity magnetic core, wherein the upper yoke magnetic core and the lower yoke magnetic core are arranged oppositely; the at least two middle column magnetic cores are arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least one high-magnetoconductivity magnetic core is arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least two middle column magnetic cores, the upper yoke magnetic core and the lower yoke magnetic core form a plurality of first magnetic circuits; the at least one high-magnetoconductivity magnetic core, the upper yoke magnetic core and the lower yoke magnetic core form at least one second magnetic circuit, wherein the relative permeability of each high-magnetoconductivity magnetic core is greater than or equal to 1000; given that the saturation flux density of each of the upper yoke magnetic core and the lower yoke magnetic core is Bs(B), the net sectional area of each magnetic circuit is Ae(B), the saturation flux density of each high-magnetoconductivity magnetic core is Bs(A), and the net sectional area of each magnetic circuit is Ae(A), Ae(A)* Bs(A)<= Ae(B)* Bs(B)*50%.
Owner:TAMURA CORP OF CHINA LTD +1
Model direct power forecast control method, device and system
ActiveCN105897029ASuppresses common mode currentGood static and dynamic performanceAc-dc conversionSingle network parallel feeding arrangementsGrid connected inverterEngineering
The invention discloses a model direct power forecast control method, device and system, and belongs to the technical field of photovoltaic power generation conversion control. The method comprises the following steps of acquiring an output voltage u<out> of a single-phase photovoltaic grid-connected inverter, a common-mode voltage u<cm> and a corresponding relation of each group of on-off state combinations; calculating a value of a target function g(k+1) of model direct power forecast control corresponding to each group of on-off state combinations; calculating the minimum value g<op>(k+1) in the target functions g(k+1); and acquiring the on-off state combination corresponding to the minimum g<op>(k+1), and achieving low common-mode model direct power forecast control of the single-phase photovoltaic grid-connected inverter. By the method, the active power and the reactive power of the inverter can be flexibly controlled, moreover, high static and dynamic performance is achieved, and the common-mode current of the single-phase photovoltaic grid-connected inverter can be effectively inhibited.
Owner:JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
Three-phase coupling reactor and converter
ActiveCN104078195AReduce volumeLow costTransformers/inductances coils/windings/connectionsTransformers/inductances magnetic coresNuclear engineeringCoupling
The invention discloses a three-phase coupling reactor and a converter. The three-phase coupling reactor comprises an iron core and six windings, the iron core comprises an upper iron yoke, a lower iron yoke, at least one first iron core post without a gas gap and three second iron core posts with gas gaps, wherein the first iron core post and the second iron core posts are located between the upper iron yoke and the lower iron yoke; two windings wind each second iron core post, and the ends of the two windings on the same second iron core post in different names are connected in a short circuit mode. According to the three-phase coupling reactor and converter, the zero sequence circulating current impedance of the converter system is increased through the coupling between windings, and accordingly the problem of uneven current of parallel power modules due to zero sequence circulating current is effectively solved.
Owner:SUZHOU INOVANCE TECH CO LTD
A high-frequency isolated AC/DC conversion circuit and a control method thereof
PendingCN109039121ASuppresses common mode currentInhibit AC anti-bias functionEfficient power electronics conversionAc-dc conversionHigh power densityDeviation function
The invention discloses a high-frequency isolated AC-DC conversion circuit and a control method thereof. The circuit comprises an input filter, an input transformer, an AC rectifier unit, an energy storage filter unit, a resonant conversion unit, an isolation transformer, a DC side rectifier unit and an output energy storage unit. The conversion circuit of the invention can work in three modes ofrectification, inverter or standby. By using the input transformer, the common-mode current on the AC side and the AC anti-deviation function can be effectively rejected while the energy storage function is realized, and the common-mode interference of the AC rectifier unit to the ground can be effectively reduced. In addition, the resonant conversion unit can realize the bi-directional conversionof soft switch, which reduces the on and off stress of each component and reduces the switching loss. Finally, multi-state conversion can be realized in the bi-directional conversion of DC voltage ina wide range by using the combination of resonant conversion unit and DC side rectifier unit to turn on the timing control.
Owner:NANJING PANDA ELECTRONICS
Filtering reactance level and variable frequency driving system using same
InactiveCN103208913AReduce lossSuppresses common mode currentPower conversion systemsComputer moduleEngineering
The invention discloses a filtering reactance level and a variable frequency driving system using same. The variable frequency driving system using the filtering reactance level comprises a rectifying input level, an inverter output level and a filtering reactance level. The filtering reactance level which is coupled between the rectifying input level and the inverter output level and comprises a magnetic core module, a first winding group, a second winding group and a third winding group. The magnetic core module comprises a middle column, a first edge column and a second edge column. The first winding group is wound on the first edge column, the second winding column is wound on the second edge column, and the first winding group and the second winding group are in series connection with a first direct current arm which is arranged between the rectifying input level and the inverter output level. The third winding group is wound on the middle column and two ends of the third winding group are in series connection with a second direct current arm between the rectifying input circuit and the inverter output circuit. The three winding groups of the filtering reactance level are capable of supplying enough common mode choke to restrain common mode currents and form adjustable different mode inductance to reduce energy loss of a filtering reactance.
Owner:DELTA ELECTRONICS INC
An isolated bidirectional AC/DC conversion circuit and a control method thereof
PendingCN109039139AReduce distractionsReduce activationEfficient power electronics conversionAc-dc conversionTransformerBias detection
The invention discloses an isolated bidirectional AC / DC conversion circuit and a control method thereof. The conversion circuit comprises an input filter, an input transformer, an AC rectifier unit, an energy storage filter unit, a DC. DC conversion unit, output energy storage unit. The circuit of the invention can make the circuit work in different modes of rectification, inversion or standby modes according to external communication commands or judgement of other external voltage and current signals. At the same time, the input transformer can realize the energy storage function of the circuit in inverter or rectifier mode, at the same time, it can effectively restrain the common-mode current of the AC side and the AC anti-bias detection function, and effectively reduce the common-mode interference of the AC rectifier unit to the ground.
Owner:NANJING PANDA ELECTRONICS
Single-stage single-phase asymmetric full-bridge inverter
InactiveCN112994500AOutput waveform distortion is lowLow costSingle network parallel feeding arrangementsPhotovoltaic energy generationCapacitanceFull bridge
The invention relates to the technical field of power electronics and particularly relates to a single-stage single-phase asymmetric full-bridge inverter. The inverter comprises an energy storage inductor, a single-phase asymmetric inverter bridge, a boost buffer capacitor and an output filter, wherein the single-phase asymmetric inverter bridge comprises five two-quadrant power switches capable of bearing unidirectional voltage stress and bidirectional current stress. The single-stage boost inverter has the advantages of single-stage boost conversion, capability of suppressing secondary ripple current of an input direct-current voltage source and common-mode current of an inverter system, high power density, high conversion efficiency, low distortion degree of an output waveform, high reliability, low cost and the like, and is suitable for small and medium-capacity single-phase boost inverter occasions.
Owner:QINGDAO UNIV
Common mode current suppression circuit of motor drive system
ActiveCN107332434ADoes not attenuate drive signalSuppresses common mode currentPower conversion systemsCapacitancePower electronics
The present invention belongs to the technical field of power electronics and provides a common mode current suppression circuit of a motor drive system for solving the interference of high frequency interference generated by a controllable rectifier and an inverter on a motor drive system and surrounding devices. The present invention includes three LC filter circuits, a transmission device and a micro control unit; the three LC filter circuits are respectively connected in series between the inverter output end and the motor input end, each LC filter circuit is formed by an adjustable inductor and a non-polar capacitor connected in series; the micro control unit controls the transmission device according to the frequency of the modulated wave signal output by the inverter; and the transmission device controls the inductance value of the adjustable inductor in each LC filter circuit separately by a sliding sheet, so that the driving current of the motor reaches the resonance in the LC filter circuit . The common mode current suppression circuit effectively suppresses the total conduction path of the common mode current to realize the common mode current suppression of the motor drive system, and ensures that the driving signal of the motor cannot be attenuated.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Modulation method and system suitable for MMC suppression common-mode voltage of even number of sub-modules
ActiveCN112039322AAvoid damageReduce common mode voltageAc-dc conversionPhotovoltaicsCapacitanceVoltage vector
The invention discloses a modulation method and system suitable for MMC suppression common-mode voltage of an even number of sub-modules, which belongs to the field of electric power. The method comprises the following steps of converting three-phase reference voltage analog quantity linear operation into three reference line voltage analog quantities injected with zero-sequence components, for the MMC with 2N sub-modules, respectively carrying out carrier comparison on the three reference line voltage analog quantities and N in-phase stacked carriers to obtain three driving signal digital quantities, linearly converting the three driving signal digital quantities into a three-phase reference voltage digital quantity of the MMC, and distributing the three-phase reference voltage digital quantity of the MMC to the sub-modules to control the MMC so as to obtain driving signals of all switching tubes in the MMC. According to the method, the zero common-mode voltage vector is equivalentlytransmitted in a carrier comparison addition and subtraction mode, the common-mode voltage is greatly reduced, the stray capacitance coupled common-mode current is suppressed, the method is easy to implement, and complicated calculation such as reference vector positioning based on a traditional space vector synthesis method is avoided.
Owner:HUAZHONG UNIV OF SCI & TECH
Inverter system of three-phase common-mode current and switch loss cooperation suppression
ActiveCN110535365AClear structureLow costEfficient power electronics conversionAc-dc conversionThree levelCapacitance
The invention discloses an inverter system of three-phase common-mode current and switch loss cooperation suppression. The system comprises a direct-current power supply system, a three-phase three-level ANPC inverter circuit, a three-phase current-limiting capacitor, a filter circuit and a three-phase load. The direct-current power supply system provides a direct-current voltage. The three-phasethree-level ANPC inverter circuit comprises an inverter main circuit and two identical support capacitors. The three-phase current-limiting capacitor comprises three identical current-limiting capacitors. The filter circuit comprises two different circuit structures and is pulled back to a midpoint of a direct-current bus, and the three-phase load comprises three alternating-current buses. By using the inverter system of the three-phase common-mode current and switch loss cooperation suppression, a small number of auxiliary capacitors and inductors are used, an occupied volume is small, and three-phase common-mode current and switch losses in a high switch frequency working environment can cooperatively restrained.
Owner:HEFEI UNIV OF TECH
Two-level inverter common-mode voltage suppression method and system
PendingCN114448282AReduce Sector SelectionSuppresses common mode currentAc-dc conversionVoltage vectorVoltage reference
The embodiment of the invention provides a two-level inverter common-mode voltage suppression method and system, and the method comprises the steps: carrying out the Clark transformation of a three-phase modulation wave, converting the three-phase modulation wave from a three-phase static coordinate system to a two-phase static coordinate system, obtaining a current reference voltage vector, and carrying out the Clark transformation of the current reference voltage vector; determining a sector where the current reference voltage vector is located by using the current reference voltage vector and a sector division rule; according to the current reference voltage vector, the sector where the current reference voltage vector is located and the direct current side voltage of the two-level inverter, the duty ratio of a zero voltage vector and the duty ratio of an odd effective voltage vector to be selected are obtained; and according to the duty ratio of the zero voltage vector and the duty ratio of the odd effective voltage vector to be selected, generating a corresponding PWM driving waveform to drive an inverter switching tube. The common-mode voltage can be effectively suppressed, sector selection of the reference voltage vector is reduced, the calculation amount is reduced, and the method is easier to implement.
Owner:JINGWEI HIRAIN (TIANJIN) RES&DEV CO LTD
Magnetic Integrated Inductor
ActiveCN104282412BSuppresses common mode currentAvoid bad consequencesTransformers/inductances magnetic coresInductance with magnetic coreEngineeringInductor
The invention relates to a magnetic integrated inductor. The magnetic integrated inductor comprises an upper yoke magnetic core, a lower yoke magnetic core, at least two middle column magnetic cores with windings and at least one high-magnetoconductivity magnetic core, wherein the upper yoke magnetic core and the lower yoke magnetic core are arranged oppositely; the at least two middle column magnetic cores are arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least one high-magnetoconductivity magnetic core is arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least two middle column magnetic cores, the upper yoke magnetic core and the lower yoke magnetic core form a plurality of first magnetic circuits; the at least one high-magnetoconductivity magnetic core, the upper yoke magnetic core and the lower yoke magnetic core form at least one second magnetic circuit, wherein the relative permeability of each high-magnetoconductivity magnetic core is greater than or equal to 1000; given that the saturation flux density of each of the upper yoke magnetic core and the lower yoke magnetic core is Bs(B), the net sectional area of each magnetic circuit is Ae(B), the saturation flux density of each high-magnetoconductivity magnetic core is Bs(A), and the net sectional area of each magnetic circuit is Ae(A), Ae(A)* Bs(A)<= Ae(B)* Bs(B)*50%.
Owner:TAMURA CORP OF CHINA LTD +1
Dual polarization antenna
InactiveCN105990651ASimple structureReduce manufacturing costRadiating elements structural formsAntennas earthing switches associationAtomic physicsFeed network
The invention discloses a dual polarization antenna which comprises a radiation unit, a feed network and a grounding plate, wherein the radiation unit is used for radiating energy into a space and comprises a first oscillator and a second oscillator, the first oscillator is perpendicular to the second oscillator, the second oscillator is parallel to the grounding plate, the first oscillator is arranged between the second oscillator and the grounding plate, the feed network is used for feeding the first oscillator, and the first oscillator is used for forming a double-polarization port.
Owner:ZTE CORP
Vehicle-mounted power supply photovoltaic inverter
InactiveCN105141160ASuppresses common mode currentAvoid lossAc-dc conversionPhotovoltaic energy generationCapacitanceCoupling inductor
The invention discloses a vehicle-mounted power supply photovoltaic inverter which comprises a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, a first filter inductor, a second filter inductor, an energy storage capacitor, a first follow-current circuit and a second follow-current circuit, wherein the input end of the first follow-current circuit is in circuit connection with the second switching circuit to form a node E, the output end of the first follow-current circuit is in circuit connection with the first switching circuit to form a node C, the input end of the second follow-current circuit is in circuit connection with the fourth switching circuit to form a node F, the output end of the second follow-current circuit is in circuit connection with the third switching circuit to form a node D, the filter inductor comprises a first winding and a second winding, the second inductor comprises a third winding and a fourth winding, one end of the first winding is connected with the node C, the other end of the first winding is connected with one end of the second winding and the node F respectively, one end of the fourth winding is connected with the node D, and the other end of the fourth winding is connected with one end of the third winding and the node E. With the adoption of the coupling inductors, ripple can be effectively suppressed, the impact of the device damage to the circuit is reduced, and short circuit is avoided.
Owner:SUZHOU BROADLINE POWER SUPPLY TECH
Control method for optically-coupled isolation vehicle power supply photovoltaic inverter
InactiveCN105119513AControl on and offReduced stabilityAc-dc conversionPhotovoltaic energy generationPower inverterPower flow
The invention discloses a control method for an optically-coupled isolation vehicle power supply photovoltaic inverter. The inverter comprises a first switching circuit, a second switching circuit, a third switching circuit, and a fourth switching circuit, and control terminals of the switching circuits are connected with an optically-coupled isolation circuit. The method includes: firstly, in the positive half-circle for outputting current, the third switching circuit, the fourth switching circuit, and a second free-wheeling circuit are controlled to always maintain the turn-off state, a first free-wheeling circuit is controlled to always maintain the turn-on state, the optically-coupled isolation circuit is controlled to maintain the same time sequence with the switching circuits, and same-direction or reverse turn-on of signals is controlled; and in the negative half-circle for outputting current, the first switching circuit , the second switching circuit, and the first free-wheeling circuit are controlled to always maintain the turn-off state, and the second free-wheeling circuit is controlled to always maintain the turn-on state. By employing the method, only two switching devices are controlled to simultaneously perform high-frequency switching so that the switching loss is reduced; and the current only flows through two devices during energy output so that the conduction loss is reduced.
Owner:WUXI EPIC TECH
One-dimensional modulation common-mode current suppression method for three-phase mid-point clamped three-level inverter
ActiveCN105245123BMeet the needs of power generation technologySuppresses common mode currentAc-dc conversionSingle network parallel feeding arrangementsTransformerNew energy
The invention discloses a one-dimensional modulation common-mode current suppression technology for a three-phase neutral point-clamped three-level inverter. Three bridge arms of a non-isolated three-phase neutral point-clamped three-level inverter respectively work in three vector states 0, 1 and 2 or the three bridge arms all work in the vector state 1; and the condition that common-mode voltage is constantly equal to 1 / 2 of direct-current bus voltage is ensured, so that the common-mode current in a non-isolated grid-connected photovoltaic power generation system is effectively suppressed. Compared with an existing common-mode current suppression technology, according to the one-dimensional modulation common-mode current suppression technology, no hardware facility is added to the photovoltaic power generation system, so that the cost of the system is reduced; the energy conversion efficiency is improved; the improved one-dimensional modulation strategy is simple in algorithm, high in operation speed and convenient to achieve; and the one-dimensional modulation common-mode current suppression technology conforms to the requirements of renewable energy source and new energy power generation technologies, and is suitable for the non-isolated grid-connected photovoltaic power generation system which does not include a transformer.
Owner:YANSHAN UNIV
Electromagnetic loss-based electric vehicle common mode current suppressor
ActiveCN104319751ASimple structureEasy to prepareEmergency protective arrangements for limiting excess voltage/currentAttenuation coefficientExponential form
The invention discloses an electromagnetic loss-based electric vehicle common mode current suppressor. The suppressor circuit adopts a ladder-shaped network form of a lumped element, and the unit structure is a low-pass circuit composed of a series inductance coil and a parallel capacitor. In view of common mode current at the frequency range of 1 to 30MHz conducted along a cable-chassis in the electric vehicle, in consideration of the length Pu of the unit structure being far smaller than the wavelength of the common mode current and convenience of circuit preparation, Pu is approximately equal to 2cm, the inductance coil is filled with composite magnetic material with the solid part and the imaginary part of magnetic permeability to be 10 magnitude, and the capacitor is filled with composite dielectric material with the solid part and the imaginary part of the dielectric constant to be 10 magnitude. The common mode current suppressor is serially connected onto the cable of the electric vehicle, and as the suppressor has a large attenuation coefficient, the common mode current is rapidly attenuated exponentially, and the common mode current in the subsequent circuit can be strongly suppressed. The suppressor of the invention is simple in structure, convenient to prepare, and can selectively and high-efficiently suppress common mode current at a wide frequency band range.
Owner:NANJING UNIV OF POSTS & TELECOMM
Omnidirectional WLAN antenna with common-mode current suppression
InactiveCN110112550ASuppresses common mode currentOvercome Pattern DistortionRadiating elements structural formsAntennas earthing switches associationOmnidirectional antennaCommunications system
The invention provides an omnidirectional WLAN (Wireless Local Area Networks) antenna with common-mode current suppression. The antenna comprises a radiation structure and a coaxial line, the radiation structure is formed by a first radiation unit, a second radiation unit and a third radiation unit (13) which have the same structure; each radiation unit is provided with three feed ports with the same structure, a first polygonal groove, a second polygonal groove and two same cutting angles; metal branches are arranged between the first polygonal grooves and the second polygonal grooves, the centers of the metal branches are provided with gaps; one end of the coaxial line is led in along one sides of the feed ports and is distributed at the edges of the first radiation units, and the otherend of the coaxial line is led out along the opposite sides of the feed ports and is connected with an SMA joint. The omnidirectional WLAN antenna can suppress the common mode current on the outer surface of the feed coaxial line and can reduce the distortion of the antenna directional diagram while meeting the performance of the omnidirectional WLAN antenna, and can be used for a wireless local area network communication system.
Owner:XIDIAN UNIV
Three-phase three-level anpc to eliminate common mode current inverter system
ActiveCN110572062BThe number of auxiliary inductors is smallSimple structureAc-dc conversionParasitic capacitorCapacitance
The invention discloses a three-phase three-level ANPC inverter system for eliminating common mode current. The system includes a DC power supply, a DC side circuit, a three-phase three-level ANPC inverter circuit, a filter circuit and a load. The DC power supply includes the common-mode parasitic capacitance of the DC power supply to the ground, the DC side circuit includes a common-mode inductor, the three-phase three-level ANPC inverter circuit includes the inverter main circuit and two identical support capacitors, and the filter circuit includes three identical Filter inductors, three identical filter capacitors and an inductance pulled back to the midpoint of the DC bus, the load includes three AC buses. The inverter system provided by the present invention has low cost of added auxiliary components and a small occupied volume, and can eliminate the influence of uncertain parasitic capacitance parameters of a DC power supply under high-frequency conditions, thereby realizing effective common-mode current elimination.
Owner:HEFEI UNIV OF TECH
PWM modulation method and system for multi-module motor, vibration and common mode current suppression
ActiveCN111900900BReduce vibration and noiseTorque Ripple ReductionTorque ripple controlAC motor controlLoop controlCarrier signal
Owner:HUAZHONG UNIV OF SCI & TECH +1
Method, device and system for model direct power predictive control
ActiveCN105897029BSuppresses common mode currentAc-dc conversionSingle network parallel feeding arrangementsPhase currentsEngineering
The invention discloses a model direct power prediction control method, device and system, which belong to the technical field of photovoltaic power generation conversion control. The method includes: obtaining the output voltage uout, common-mode voltage ucm and each Correspondence between a group of switch state combinations; calculate the value of the objective function g(k+1) of the model direct power predictive control corresponding to each group of switch state combinations; calculate the value of the objective function g(k+1) The minimum value gop(k+1) of the minimum value gop(k+1); obtain the switch state combination corresponding to the minimum value gop(k+1), and realize the low common mode current model direct power predictive control of the single-phase photovoltaic grid-connected inverter. The invention can flexibly control the active power and reactive power of the inverter, has good static and dynamic performance, and can effectively suppress the common-mode current of the single-phase photovoltaic grid-connected inverter.
Owner:GOODWE TECHNOLOGIES CO LTD
A Common Mode Current Suppressor for Electric Vehicles Based on Electromagnetic Loss
ActiveCN104319751BSimple structureEasy to prepareEmergency protective arrangements for limiting excess voltage/currentAttenuation coefficientSuppressor
The invention discloses an electromagnetic loss-based electric vehicle common mode current suppressor. The suppressor circuit adopts a ladder-shaped network form of a lumped element, and the unit structure is a low-pass circuit composed of a series inductance coil and a parallel capacitor. In view of common mode current at the frequency range of 1 to 30MHz conducted along a cable-chassis in the electric vehicle, in consideration of the length Pu of the unit structure being far smaller than the wavelength of the common mode current and convenience of circuit preparation, Pu is approximately equal to 2cm, the inductance coil is filled with composite magnetic material with the solid part and the imaginary part of magnetic permeability to be 10 magnitude, and the capacitor is filled with composite dielectric material with the solid part and the imaginary part of the dielectric constant to be 10 magnitude. The common mode current suppressor is serially connected onto the cable of the electric vehicle, and as the suppressor has a large attenuation coefficient, the common mode current is rapidly attenuated exponentially, and the common mode current in the subsequent circuit can be strongly suppressed. The suppressor of the invention is simple in structure, convenient to prepare, and can selectively and high-efficiently suppress common mode current at a wide frequency band range.
Owner:NANJING UNIV OF POSTS & TELECOMM
Inverter system with cooperative suppression of three-phase common-mode current and switching loss
ActiveCN110535365BClear structureLow costEfficient power electronics conversionAc-dc conversionCapacitanceCurrent limiting
Owner:HEFEI UNIV OF TECH
Three-phase coupling reactor and converter
ActiveCN104078195BReduce volumeLow costTransformers/inductances coils/windings/connectionsTransformers/inductances magnetic coresNuclear engineeringCoupling
The invention discloses a three-phase coupling reactor and a converter. The three-phase coupling reactor comprises an iron core and six windings, the iron core comprises an upper iron yoke, a lower iron yoke, at least one first iron core post without a gas gap and three second iron core posts with gas gaps, wherein the first iron core post and the second iron core posts are located between the upper iron yoke and the lower iron yoke; two windings wind each second iron core post, and the ends of the two windings on the same second iron core post in different names are connected in a short circuit mode. According to the three-phase coupling reactor and converter, the zero sequence circulating current impedance of the converter system is increased through the coupling between windings, and accordingly the problem of uneven current of parallel power modules due to zero sequence circulating current is effectively solved.
Owner:SUZHOU INOVANCE TECH CO LTD
An excitation device of an electric excitation motor and its parameter acquisition method
InactiveCN107707171BImprove stabilityOvercoming Common Mode Current ProblemsAC motor controlTerminal voltageConductor Coil
The invention discloses an electrical excitation motor excitation device and parameter obtaining method thereof. The electrical excitation motor excitation device includes an excitation winding, an excitation winding buck circuit, an isolation type DC / DC converter, a three-phase winding and a bus power supply; the bus power supply is connected with the three-phase winding and is used for providinga bus voltage for the three-phase winding; the input end of the isolation type DC / DC converter is connected with the bus power supply, the output end is connected with the input end of the excitationwinding buck circuit, and the isolation type DC / DC converter is used for performing isolation ratio transformation on the bus voltage provided by the bus power supply to serve as an input voltage ofthe excitation winding buck circuit; and the output end of the excitation winding buck circuit is connected with the excitation winding, the buck circuit is used for performing chopping on the bus voltage after isolation ratio transformation, and a voltage obtained after chopping serves as a terminal voltage of the excitation winding. The electrical excitation motor excitation device provided by the invention eliminates a common-mode access between an excitation loop and a three-phase loop, suppresses common-mode current, and considers optimization of a power device duty ratio, thereby achieving better power device control performance.
Owner:HUAZHONG UNIV OF SCI & TECH
System combined inverter
ActiveCN102714469BSuppresses common mode currentDc-ac conversion without reversalGrid-tie inverterThree-phase
According to one embodiment, a grid-tie inverter includes: a single-phase or three-phase inverter (1) that performs pulse width modulation for a DC voltage supplied from a DC power supply (5); a first capacitor circuit (41) connected to an input side of the inverter (1) so as to form a neutral point (c); a second capacitor circuit (42) connected to an output side of the inverter (1) so as to form a neutral point (f); a common mode current bypass channel (g) formed by connecting the neutral point (c) of the first capacitor circuit (41) and the neutral point (f) of the second capacitor circuit (42) to each other; a grounded capacitor (11) provided between the bypass channel (g) and a ground; a first common mode choke coil unit (31, 32) that includes a common mode choke coil (31, 32) at least one of between the first capacitor circuit (41) and the inverter (1) and between the inverter (1) and the second capacitor circuit (42), and suppresses a common mode current occurring in the inverter (1); and an output filter (2) that converts a pulse width-modulated voltage waveform outputted from the inverter (1) into a sine single-phase or three-phase AC voltage.
Owner:KK TOSHIBA
Alternating current-direct current coupling type common mode inductor for direct current inversion power supply system
ActiveCN113380492AIncrease inductanceReduce volumeTransformers/inductances coils/windings/connectionsInductance with magnetic coreMagnetic coreInductor
The invention provides an alternating current-direct current coupling type common mode inductor for a direct current inverter power supply system. The alternating current-direct current coupling type common mode inductor comprises a direct current side common mode inductor (1) and an alternating current side common mode inductor (2); the direct current side common mode inductor (1) comprises an annular first magnetic core (11) and two windings (12) which are wound on the first magnetic core (11) and have the same direction; and the alternating current side common mode inductor (2) comprises an annular second magnetic core (21) and two or three alternating current phase lines (22) penetrating through a window of the second magnetic core (21). According to the alternating current and direct current coupling type common mode inductor for the direct current inversion power supply system of the invention, the second magnetic core (21) is supported and nested in the window of the first magnetic core (11) through an insulating material (4), and coupling of the direct current side common mode inductor (1) and the alternating current side common mode inductor (2)of an inverter is realized, so that the size miniaturization of the alternating current-direct current coupling type common mode inductor is realized on the premise of ensuring effective suppression of common-mode currents at the alternating current side and the direct current side of the direct current inversion power supply system.
Owner:XIDIAN UNIV
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