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31 results about "Three phase diode rectifier" patented technology
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High-power and high-step-up ratio photovoltaic DC converter device and control method
ActiveCN106374830ALow costReduce volumeAc-dc conversionDc-dc conversionDc converterThree phase diode rectifier
The invention discloses a high-power and high-step-up ratio photovoltaic DC converter device and a control method. An intermediate frequency 400Hz transformer-based high-power and high-step-up ratio photovoltaic DC converter device with low cost and high efficiency is firstly provided. The high-power and high-step-up ratio photovoltaic DC converter device comprises a multi-channel boost DC transformer, a modular parallel photovoltaic inverter, an intermediate frequency 400Hz three-winding boost transformer, three-phase diode rectifier bridges and high-voltage filter circuits. A control method is disclosed according to the converter device. According to the control method, voltage of an output end of a photovoltaic array is firstly adjusted by using the boost DC transformer, so that the power of the output end of the photovoltaic array is adjusted, and then the power of the output end of the photovoltaic array is transmitted to a transformer side through double loop control of AC / DC side voltage and bridge arm side inductance current of the modular parallel photovoltaic inverter and is transmitted to the final high-voltage DC bus through transformer boosting conversion, diode rectification and the high-voltage filter circuit.
Owner:HEFEI UNIV OF TECH
Reduced rating T-connected autotransformer for converting three phase AC voltages to nine/six phase shifted AC voltages
InactiveUS7375996B2Reduce the number of coilsReduce probabilityConversion without intermediate conversion to dcFixed transformersFrequency changerAutotransformer
The invention provides a T-connected autotransformer for converting three-phase ac input voltages to nine phase shifted ac voltages feeding three sets of three-phase diode rectifier bridges. The nine phase shifted voltages are at an angle of +20 degree or −20 degree with respect to the supply voltages and their magnitudes are essentially identical. The present design requires substantially fewer coils than other autotransformers for 18-pulse AC-DC converters, resulting in saving in space, volume, weight, size and cost of the converter. The magnetics requirement is only about 30% of the drive rating. The output voltage ratio can also be selected to give an average dc output from the proposed converter same as that of a conventional three-phase diode bridge rectifier. However, it is also possible to step up or step down the output voltage as required.
Owner:INDIAN INST OF TECH DELHI
Soft starter used for continuous frequency conversion and voltage transformation of motor
InactiveCN101814873ALow costImprove performancePolyphase induction motor starterCapacitanceThree phase asynchronous motor
The invention relates to control equipment of power electronics and aims to provide a soft starter used for continuous frequency conversion and voltage transformation of the motor. The soft starter comprises a mechanical switch K1 which is connected with a three-phase electric network power supply, and further comprises a series circuit which consists of an inverter and a fully-controlled high-frequency electronic switch Kd, wherein the series circuit and a capacitor C0 are connected to two output terminals of a three-phase diode rectifier bridge in parallel; the mechanical switch K1 is connected to an input terminal of the three-phase diode rectifier bridge; in the inverter, three pairs of bridge arms are formed by six sets of thyristors Th1,1' to Th6,6'; each pair of bridge arms consist of two anti-parallel thyristors; and the center point of an upper bridge arm and a lower bridge arm of each of the three pairs of bridge arms leads a lead out respectively and is connected to a three-phase asynchronous motor through a mechanical switch K4. In the soft starter used for continuous frequency conversion and voltage transformation of the motor, three functions of regulating voltage, switching off an inverter thyristor, and switching off the main circuit when protection is needed can be simultaneously realized by using only one fully-controlled electronic switch Kd. Simultaneously, due to the adoption of the thyristor inverter, the soft starter has the advantages of simple and reliable circuit, low cost, and great use flexibility.
Owner:汪槱生
High-power high-voltage photovoltaic direct-current boost converter apparatus and control method thereof
ActiveCN106357119AResonant cavity reductionImprove efficiencyDc-dc conversionPhotovoltaic energy generationThree phase diode rectifierHigh pressure
The invention provides a high-power high-voltage photovoltaic direct-current boost converter apparatus suitable for direct-current power transmission at photovoltaic power stations, and a control method thereof; the High-power high-voltage photovoltaic direct-current boost converter apparatus comprises N photovoltaic generating units and N boost conversion units corresponding to the photovoltaic generating units, a high-power three-phase square wave inverter, a modular high-frequency three-phase boost transformer unit and a modular three-phase diode rectifier bridge unit; the converter apparatus is modulated by using ring-opening square PAM (pulse amplitude modulation), and controlling pulse amplitude through the photovoltaic generating units and the boost conversion units is simple and efficient.
Owner:HEFEI UNIV OF TECH
Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer
InactiveCN105763037AEliminate inrush currentAvoid current shockPower conversion systemsCapacitanceEngineering
A precharge soft starting circuit for a three-phase voltage type bi-directional PWM current transformer comprises a first contactor K1, a three-phase diode rectifier bridge TM, a BUCK-BOOST circuit, a second contactor K2 and a DSP, wherein a three-phase alternating voltage source is connected with the alternating-current side of the three-phase diode rectifier bridge TM through the first contactor, the direct-current side of the three-phase diode rectifier bridge TM is connected with the BUCK-BOOST circuit, the BUCK-BOOST circuit is connected with the second contactor K2, the second contactor K2 is connected with the two sides of a direct-current end bus capacitor, and the first contactor K1, the controlled end of the BUCK-BOOST circuit and the second contactor K2 are all connected with the control end of the DSP. Current surge in the starting process is effectively avoided, so that service life is prolonged.
Owner:ZHEJIANG UNIV OF TECH
Reduced Rating T-Connected Autotransformer For Converting Three Phase AC Voltages To Nine/Six Phase Shifted AC Voltages
InactiveUS20070103125A1Reduce the number of coilsReduce probabilityConversion without intermediate conversion to dcFixed transformersAutotransformerPhase shifted
The invention provides a T-connected autotransformer for converting three-phase ac input voltages to nine phase shifted ac voltages feeding three sets of three-phase diode rectifier bridges. The nine phase shifted voltages are at an angle of +20 degree or −20 degree with respect to the supply voltages and their magnitudes are essentially identical. The present design requires substantially fewer coils than other autotransformers for 18-pulse AC-DC converters, resulting in saving in space, volume, weight, size and cost of the converter. The magnetics requirement is only about 30% of the drive rating. The output voltage ratio can also be selected to give an average dc output from the proposed converter same as that of a conventional three-phase diode bridge rectifier. However, it is also possible to step up or step down the output voltage as required.
Owner:INDIAN INST OF TECH
One-way hybrid three-phase voltage source rectifier
InactiveCN106787857AAchieve sinusoidalGood control effectAc-dc conversion without reversalPower factorMaterial resources
The invention discloses a one-way hybrid three-phase voltage source rectifier. The one-way hybrid three-phase voltage source rectifier comprises a three-phase diode rectifier bridge, a filter, a rectifier bridge composed of six IGBT switching tubes, a voltage sensor, a current sensor and a signal conditioning circuit. Due to the above structure, the outer ring is in a PI control mode; the inner ring is in a passive hybrid control mode; therefore, excellent current tracking capability, high robustness, steady control and constant output voltage can be realized; the efficiency, the power density and the reliability can be effectively improved; the alternating-current current harmonic can be reduced; and the power factor can be increased. By means of the one-way hybrid three-phase voltage source rectifier disclosed by the invention, the working efficiency of the rectifier in industrial use can be greatly increased; and a lot of manpower and material resources can be saved.
Owner:纪新辉
Improved continuous variable-voltage and variable-frequency soft starter
InactiveCN101902182ALarge starting torqueLow costPolyphase induction motor starterCapacitanceThree phase asynchronous motor
The invention relates to a power electronics control device and aims at providing an improved continuous variable-voltage and variable-frequency soft starter used for a motor. The soft starter comprises a mechanical switch K1 and a series circuit, wherein the series circuit comprises an inverter and full-control high-frequency electronic switches Gd1 and Gd2, and the series circuit and a capacitor C0 are connected in parallel with both ends of the output of a three-phase diode rectifier; a series switch circuit made by connecting a full-control high-frequency electronic switch Gd3 and a diode DE in series is connected in parallel with both ends of the input of the inverter; and wires respectively from the middle points of three pairs of bridge arms of the inverter are connected with a three-phase asynchronous motor through a switch K2. The soft starter can change frequency and voltage continuously, so that the starting force of the motor is great while the starting current is not too great; the cost is reduced and the overload capacity is enhanced, so that the soft starter can be applicable to high-voltage occasions; and the three functions of regulating voltage, cutting off during failure and turning off an inverter thyristor can be realized by using a few full-control high-frequency elements, so that the full-control high-frequency elements work at high frequency while the thyristor works at low frequency.
Owner:汪槱生
Power-on current-limiting circuit and application circuit of power-on current-limiting circuit
InactiveCN102611088AEnhanced inhibitory effectSimple structureEmergency protective arrangements for limiting excess voltage/currentPower conversion systemsCapacitanceThree phase diode rectifier
The invention discloses a power-on current-limiting circuit and an application circuit of the power-on current-limiting circuit. The input end of the power-on current-limiting circuit is connected with one end of the primary side of a transformer and the positive electrode of the output end of a relay respectively, and the other end of the primary side of the transformer is connected with the negative electrode of the output end of the relay so as to form the output end of the power-on current-limiting circuit; a resonant capacitor and a resonant resistor are in bridge connection with the secondary side of the transformer; a first power diode is in reverse connection with the input end of the relay; and the positive electrode of the input end of the relay and the cathode of the first power diode are respectively connected with a control power supply, and the negative electrode of the input end of the relay is connected with the anode of the first power diode so as to form the control terminal of the power-on current-limiting circuit. The power-on current-limiting circuit and the application circuit are simple in structures, are convenient to control, can be matched with a three-phase diode rectifier, a single-phase diode rectifier, a three-phase IGBT (insulated gate bipolar transistor) controlled rectifier and a single-phase IGBT controlled rectifier, and can be laid on an alternating current side or a direct current side and widely applied to all power electronic convertors, the power-on current is adjustable, the power-on effect is good, the current displacement factor is always 1, and the service life of an electrolytic capacitor is long.
Owner:上海寰晟新能源科技有限公司
Instantaneous power detection and load identification based induction motor cooperative control system
ActiveCN103023420ARealize power-saving operationWith load following capabilityElectronic commutation motor controlAC motor controlDigital signal processingPower factor
The invention discloses an instantaneous power detection and load identification based induction motor cooperative control system which realizes energy-saving control on a light-loaded or unloaded three-phase induction motor and mainly comprises an instantaneous power detection and load identification cooperative controller using a digital signal processor TMS320F28346 as a core, a three-phase bridge power amplifier, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier bridge, an instantaneous power detection link, a current detection link, a coder rotating speed detection link, a load identification link, a +24V switch power source, a +15V switch power source, a + / -12V switch power source, a +5V power source and the like. An instantaneous power detection and load identification based induction motor cooperative control method is adopted to control stator exciting current of the light-loaded or unloaded three-phase induction motor, and power factors of the three-phase induction motor are adjusted by load rate obtained on the basis of load identification, so that operating efficiency of the three-phase induction motor is effectively improved, and good electricity-saving effect is achieved.
Owner:BEIJING HONGHUI INT ENERGY TECH DEV CO LTD
Intermediate frequency power supply heating system
InactiveCN105450037AEasy to useMeet the output matchAc-ac conversionInduction heating controlCapacitanceOutput transformer
The invention discloses an intermediate frequency power supply heating system. The intermediate frequency power supply heating system comprises a three-phase diode rectifier bridge device and an IGBT (Insulated Gate Bipolar Transistor) full-bridge single-phase inverter which are connected in sequence, and a selector switch, wherein the input end of the selector switch is connected to the output end of the IGBT full-bridge single-phase inverter; one of two ways of the output ends of the selector switch is connected to the input end of a homogeneous tube heating output transformer, and the other way of the output end of the selector switch is connected to the input end of a weld joint heating output transformer; and the output end of the homogeneous tube heating output transformer is connected to a homogeneous tube heating resonant capacitor bank, and the output end of the weld joint heating output transformer is connected to a weld joint heating resonant capacitor bank. The intermediate frequency power supply heating system has the following technical effects that the output matching of homogeneous tube induction heating and the output matching of weld joint heating are both met, the device volume is reduced, and one device meets technological requirements of two heating ways to be convenient for a user to use.
Owner:INDUCTOTHERM GROUP CHINA +1
Quality power from induction generator feeding variable speed motors
InactiveUS20060091674A1Without degrading qualityFacilitates heat recoveryBoards/switchyards circuit arrangementsAC motor controlPower factorThree phase diode rectifier
A prime mover (28) in a heat recovery system drives an induction generator (8) which feeds power to a utility grid (9) through a breaker (10) but also powers a load including auxiliary induction motors (11, 12). To provide acceptable waveform and power factor, the auxiliary equipment is driven through IGBT switched bridge converters (13) by DC voltage (15) generated by an IGBT switched bridge converter (13a), instead of three-phase diode rectifiers (16). The switched bridge converter controller (14a) is responsive to a system process controller (23a) which causes the switched bridge controller (13a) to be driven in response to the voltage (26) and current (27) on the generator bus (17). This eliminates the need for harmonic filters (18) and power factor capacitors (20) while improving the quality of the power generated. The controller (23a) trips the breaker if the voltage, frequency or power factor is out of limits.
Owner:UNITED TECH CORP
Novel topological structure of sparse two-stage matrix converter
ActiveCN104601002AImprove reliabilityEasy to controlConversion with intermediate conversion to dcMatrix convertersPower factor
The invention discloses a novel spare topological structure of a sparse two-stage matrix converter. The structure comprises three two-way controllable switches, a three-phase diode rectifier bridge and a three-phase inverter. With the adoption of the novel topological structure of the sparse two-stage matrix converter, the shortage that the rectifier stage of other two-stage matrix converter easily generates negative pressure which leads to short circuit fault can be overcome, and the system reliability can be effectively improved; in addition, the input reactive power angle adjusting range is expanded to be [-90 degrees, 90 degrees], and therefore, the problem that the input side power factor angle of the traditional two-stage matrix converter can be adjusted within the range of [-30 degrees, 30 degrees]; the topological structure is simple and reliable to control, and relatively high in practical value.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Direct power control system of high power factor induction motor
ActiveCN103066914ARealize energy savingReduce computationElectronic commutation motor controlVector control systemsDigital signal processingPower control system
A direct power control system of a high power factor induction motor realizes energy-saving control of a three-phase induction motor under the condition of light load or no load. The direct power control system of the high power factor induction motor comprises a controller using a digital signal processor TMS320F2808 as the core, a three-phase bridge power amplification device, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier, a power factor detecting link, a current detecting link, an encoder rotating speed detecting link, a power factor measuring link, a + 24V switching power supply, a +15V switching power, a + / - switching power supply, a +5V switching power and the like. By means of the direct power control system applying power factor measurement, the stator flux linkage amplitude of the three-phase induction motor under the condition of light load or no load is controlled, instantaneous reactive power of the motor is adjusted, and therefore the motor power factor is effectively improved and a good energy-saving effect is achieved.
Owner:BEIJING HONGHUI INT ENERGY TECH DEV CO LTD
Line voltage cascaded three-phase diode high-power factor converter and control strategy thereof
PendingCN110048623AReduce voltage stressReduce in quantityEfficient power electronics conversionAc-dc conversionPower factorThree phase diode rectifier
The invention discloses a topological structure of a line voltage cascaded three-phase diode high-power factor converter and a control strategy of the topological structure, and belongs to an AC / DC converter. The converter comprises three three-phase diode high-power factor converter modules with cascaded line voltages, wherein each module is composed of a three-phase diode rectifier bridge, a boost inductor and N power switch units. The purposes of reducing the voltage stress of a switch tube and improving the voltage application level are achieved by utilizing a line voltage cascading connection mode and a power switch unit cascading mode, so that the converter can be applied to high-voltage and high-power occasions; according to the circuit topology provided by the invention, the wholesystem can truly realize unit power factor operation; and the number of used fully-controlled power switching devices is reduced to the maximum extent, so that the manufacturing cost, the size, the switching loss and the control complexity of the converter are effectively reduced.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Servo intelligent power control circuit and servo intelligent power control method based on thyristor rectification
ActiveCN103023355AReduce feverAvoid secondary failureAc-dc conversionSignal processing circuitsEngineering
The invention discloses a servo intelligent power control circuit and a servo intelligent power control method based on thyristor rectification. The control circuit comprises an MCU (microprogrammed control unit), a signal processing circuit, a sampling circuit, an ADC (analog-digital converter) conversion circuit, an alarm processing circuit and a thyristor triggering circuit, wherein the sampling circuit is used for acquiring alternating-current and direct-current bus voltage and current signals and providing the acquired signals for the signal processing circuit and the ADC conversion circuit; the signal processing circuit is used for reshaping and comparing the acquired signals and providing a natural phase change point of a corresponding-phase alternating-current bus for the MCU; and the MCU is used for processing the signals from the signal processing circuit and the ADC conversion circuit and controlling a thyristor array by the aid of the thyristor triggering circuit. The control circuit solves the technical problems that output voltage is non-adjustable as alternating-current and direct-current rectification portions adopt three-phase diode rectifiers, continuous powering up cannot be achieved as a thermistor is used for soft start, or secondary failure occurs easily as a high-power cement resistor is adopted.
Owner:GSK CNC EQUIP
Improved continuous variable-voltage and variable-frequency soft starter
InactiveCN101902182BLarge starting torqueLow costPolyphase induction motor starterCapacitanceThree phase asynchronous motor
The invention relates to a power electronics control device and aims at providing an improved continuous variable-voltage and variable-frequency soft starter used for a motor. The soft starter comprises a mechanical switch K1 and a series circuit, wherein the series circuit comprises an inverter and full-control high-frequency electronic switches Gd1 and Gd2, and the series circuit and a capacitor C0 are connected in parallel with both ends of the output of a three-phase diode rectifier; a series switch circuit made by connecting a full-control high-frequency electronic switch Gd3 and a diodeDE in series is connected in parallel with both ends of the input of the inverter; and wires respectively from the middle points of three pairs of bridge arms of the inverter are connected with a three-phase asynchronous motor through a switch K2. The soft starter can change frequency and voltage continuously, so that the starting force of the motor is great while the starting current is not too great; the cost is reduced and the overload capacity is enhanced, so that the soft starter can be applicable to high-voltage occasions; and the three functions of regulating voltage, cutting off during failure and turning off an inverter thyristor can be realized by using a few full-control high-frequency elements, so that the full-control high-frequency elements work at high frequency while the thyristor works at low frequency.
Owner:汪槱生
Electric energy conversion device applied to fast charging of electric vehicle
InactiveCN110212791ASmall footprintReduced footprintCharging stationsAc-dc conversionElectrical batteryFast charging
The invention provides an electric energy conversion device applied to fast charging of an electric vehicle, and belongs to the technical field of power electronics. The electric energy conversion device is composed of three groups of cascaded AC-AC converters, three groups of LC filters, three three-winding isolated transformers, two groups of three-phase diode rectifier bridges and a balance reactor. The three groups of cascaded AC-AC converts and the three groups of LC filters convert the three-phase power frequency alternating current into three-phase high frequency alternating current. The input side of the three groups of AC-AC converters uses the mode of cascaded connection of n single-phase diode rectifier bridges to be directly connected with a medium-voltage AC power grid so as to reduce the occupation area and the cost of a charging station. The three three-winding isolated transformers, the two groups of three-phase diode rectifier bridges and the balance reactor form a parallel 12-pulse rectifier so as to output high current and improve the charging speed of the battery.
Owner:HARBIN INST OF TECH AT WEIHAI
System and method for generating and utilizing electric power
InactiveCN101057390BElectric generator controlHarmonic reduction arrangementElectric power systemPower factor
A prime mover ( 28 ) in a heat recovery system drives an induction generator ( 8 ) which feeds power to a utility grid ( 9 ) through a breaker ( 10 ) but also powers a load including auxiliary induction motors ( 11, 12 ). To provide acceptable waveform and power factor, the auxiliary equipment is driven through IGBT switched bridge converters ( 13 ) by DC voltage ( 15 ) generated by an IGBT switched bridge converter ( 13 a), instead of three-phase diode rectifiers ( 16 ). The switched bridge converter controller ( 14 a) is responsive to a system process controller ( 23 a) which causes the switched bridge controller ( 13 a) to be driven in response to the voltage ( 26 ) and current ( 27 ) on the generator bus ( 17 ). This eliminates the need for harmonic filters ( 18 ) and power factor capacitors ( 20 ) while improving the quality of the power generated. The controller ( 23 a) trips the breaker if the voltage, frequency or power factor is out of limits.
Owner:UTC POWER LLC (US)
Power-on current-limiting circuit and application circuit of power-on current-limiting circuit
InactiveCN102611088BEnhanced inhibitory effectSimple structureEmergency protective arrangements for limiting excess voltage/currentPower conversion systemsCapacitanceEngineering
The invention discloses a power-on current-limiting circuit and an application circuit of the power-on current-limiting circuit. The input end of the power-on current-limiting circuit is connected with one end of the primary side of a transformer and the positive electrode of the output end of a relay respectively, and the other end of the primary side of the transformer is connected with the negative electrode of the output end of the relay so as to form the output end of the power-on current-limiting circuit; a resonant capacitor and a resonant resistor are in bridge connection with the secondary side of the transformer; a first power diode is in reverse connection with the input end of the relay; and the positive electrode of the input end of the relay and the cathode of the first power diode are respectively connected with a control power supply, and the negative electrode of the input end of the relay is connected with the anode of the first power diode so as to form the control terminal of the power-on current-limiting circuit. The power-on current-limiting circuit and the application circuit are simple in structures, are convenient to control, can be matched with a three-phase diode rectifier, a single-phase diode rectifier, a three-phase IGBT (insulated gate bipolar transistor) controlled rectifier and a single-phase IGBT controlled rectifier, and can be laid on an alternating current side or a direct current side and widely applied to all power electronic convertors, the power-on current is adjustable, the power-on effect is good, the current displacement factor is always 1, and the service life of an electrolytic capacitor is long.
Owner:上海寰晟新能源科技有限公司
Improved rectifier circuit
InactiveCN103095155ASimple and fast operationGuaranteed uptimeAc-dc conversion without reversalApparatus without intermediate ac conversionLow-pass filterControl system
The invention discloses an improved rectifier circuit. The improved rectifier circuit comprises alternating current input and direct current output. The improved rectifier circuit is characterized in that the alternating current input is connected with a generator, the generator is connected with an energy release control portion, and the energy release control portion is connected with the current output; the energy release control portion comprises a three-phase diode rectifier bridge, a low pass filter and a direct current step-down chopper, the direct current step-down chopper is further connected with a pulse width modulation output controller, the pulse width modulation output controller is connected with a triangular wave direct current comparison controller, the triangular wave direct current comparison controller is further connected with rotating speed signals and output voltage feedback signals, and the generator is further connected with a control system. The improved rectifier circuit has the advantages of being simple and convenient to operate, smooth and stable in whole operation, safe, reliable, and low in manufacture cost.
Owner:陆峰
Instantaneous power detection and load identification based induction motor cooperative control system
ActiveCN103023420BRealize power-saving operationWith load following capabilityElectronic commutation motor controlAC motor controlDigital signal processingPower factor
The invention discloses an instantaneous power detection and load identification based induction motor cooperative control system which realizes energy-saving control on a light-loaded or unloaded three-phase induction motor and mainly comprises an instantaneous power detection and load identification cooperative controller using a digital signal processor TMS320F28346 as a core, a three-phase bridge power amplifier, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier bridge, an instantaneous power detection link, a current detection link, a coder rotating speed detection link, a load identification link, a +24V switch power source, a +15V switch power source, a + / -12V switch power source, a +5V power source and the like. An instantaneous power detection and load identification based induction motor cooperative control method is adopted to control stator exciting current of the light-loaded or unloaded three-phase induction motor, and power factors of the three-phase induction motor are adjusted by load rate obtained on the basis of load identification, so that operating efficiency of the three-phase induction motor is effectively improved, and good electricity-saving effect is achieved.
Owner:BEIJING HONGHUI INT ENERGY TECH DEV CO LTD
Soft starter used for continuous frequency conversion and voltage transformation of motor
InactiveCN101814873BImprove performanceLow costPolyphase induction motor starterCapacitanceThree phase asynchronous motor
The invention relates to control equipment of power electronics and aims to provide a soft starter used for continuous frequency conversion and voltage transformation of the motor. The soft starter comprises a mechanical switch K1 which is connected with a three-phase electric network power supply, and further comprises a series circuit which consists of an inverter and a fully-controlled high-frequency electronic switch Kd, wherein the series circuit and a capacitor C0 are connected to two output terminals of a three-phase diode rectifier bridge in parallel; the mechanical switch K1 is connected to an input terminal of the three-phase diode rectifier bridge; in the inverter, three pairs of bridge arms are formed by six sets of thyristors Th1,1' to Th6,6'; each pair of bridge arms consistof two anti-parallel thyristors; and the center point of an upper bridge arm and a lower bridge arm of each of the three pairs of bridge arms leads a lead out respectively and is connected to a three-phase asynchronous motor through a mechanical switch K4. In the soft starter used for continuous frequency conversion and voltage transformation of the motor, three functions of regulating voltage, switching off an inverter thyristor, and switching off the main circuit when protection is needed can be simultaneously realized by using only one fully-controlled electronic switch Kd. Simultaneously,due to the adoption of the thyristor inverter, the soft starter has the advantages of simple and reliable circuit, low cost, and great use flexibility.
Owner:汪槱生
Harmonic superposition method of three-phase bridge rectification load based on capacitor filter
ActiveCN106451448BReduce Harmonic PollutionEasy to formulateAc-dc conversion without reversalHarmonic reduction arrangementCapacitanceElectric power system
The invention discloses a three-phase bridge-type rectifier load harmonic superposition method based on capacitor filtering. The method is characterized in that an alternating current side bus is connected to two same capacitor-filtering-type three-phase bridge rectifier circuits; and each capacitor-filtering-type three-phase bridge rectifier circuit includes a three-phase diode rectifier connected to the alternating current side bus, a filtering capacitor and a load resistor, wherein the filtering capacitor and the load resistor are connected in parallel to a direct current side of the three-phase diode rectifier; and a capacitance difference of the filtering capacitors in the two capacitor-filtering-type three-phase bridge rectifier circuits exceeds a threshold. By using the method, an influence of a three-phase bridge-type rectifier load harmonic of the capacitor filtering on a power grid can be actively reduced, harmonic treatment measures can be well made and cost of electric power system harmonic treatment is reduced.
Owner:STATE GRID CORP OF CHINA +3
Three-phase bridge-type rectifier load harmonic superposition method based on capacitor filtering
ActiveCN106451448AReduce Harmonic PollutionEasy to formulateAc-dc conversion without reversalHarmonic reduction arrangementCapacitanceElectric power system
The invention discloses a three-phase bridge-type rectifier load harmonic superposition method based on capacitor filtering. The method is characterized in that an alternating current side bus is connected to two same capacitor-filtering-type three-phase bridge rectifier circuits; and each capacitor-filtering-type three-phase bridge rectifier circuit includes a three-phase diode rectifier connected to the alternating current side bus, a filtering capacitor and a load resistor, wherein the filtering capacitor and the load resistor are connected in parallel to a direct current side of the three-phase diode rectifier; and a capacitance difference of the filtering capacitors in the two capacitor-filtering-type three-phase bridge rectifier circuits exceeds a threshold. By using the method, an influence of a three-phase bridge-type rectifier load harmonic of the capacitor filtering on a power grid can be actively reduced, harmonic treatment measures can be well made and cost of electric power system harmonic treatment is reduced.
Owner:STATE GRID CORP OF CHINA +3
High power and high step-up ratio photovoltaic DC converter device and control method
ActiveCN106374830BLow costReduce volumeAc-dc conversionDc-dc conversionIntermediate frequencyEngineering
Owner:HEFEI UNIV OF TECH
Direct power control system of high power factor induction motor
ActiveCN103066914BRealize energy savingReduce computationElectronic commutation motor controlVector control systemsDigital signal processingPower control system
A direct power control system of a high power factor induction motor realizes energy-saving control of a three-phase induction motor under the condition of light load or no load. The direct power control system of the high power factor induction motor comprises a controller using a digital signal processor TMS320F2808 as the core, a three-phase bridge power amplification device, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier, a power factor detecting link, a current detecting link, an encoder rotating speed detecting link, a power factor measuring link, a + 24V switching power supply, a +15V switching power, a + / - switching power supply, a +5V switching power and the like. By means of the direct power control system applying power factor measurement, the stator flux linkage amplitude of the three-phase induction motor under the condition of light load or no load is controlled, instantaneous reactive power of the motor is adjusted, and therefore the motor power factor is effectively improved and a good energy-saving effect is achieved.
Owner:BEIJING HONGHUI INT ENERGY TECH DEV CO LTD
A sparse two-stage matrix converter topology
ActiveCN104601002BImprove reliabilityEasy to controlConversion with intermediate conversion to dcMatrix convertersPower factor
The invention discloses a novel spare topological structure of a sparse two-stage matrix converter. The structure comprises three two-way controllable switches, a three-phase diode rectifier bridge and a three-phase inverter. With the adoption of the novel topological structure of the sparse two-stage matrix converter, the shortage that the rectifier stage of other two-stage matrix converter easily generates negative pressure which leads to short circuit fault can be overcome, and the system reliability can be effectively improved; in addition, the input reactive power angle adjusting range is expanded to be [-90 degrees, 90 degrees], and therefore, the problem that the input side power factor angle of the traditional two-stage matrix converter can be adjusted within the range of [-30 degrees, 30 degrees]; the topological structure is simple and reliable to control, and relatively high in practical value.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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ActiveCN106357119BResonant cavity reductionImprove efficiencyDc-dc conversionPhotovoltaic energy generationThree phase diode rectifierHigh pressure
Owner:HEFEI UNIV OF TECH
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