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33results about How to "Guaranteed power factor" patented technology
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Power factor correction control circuit for reducing EMI (electro magnetic interference)
ActiveCN102332814ALighten the filtering burdenThe maximum peak current is reducedEfficient power electronics conversionEnergy industryHarmonicCurrent threshold
The invention discloses a power factor correction control circuit for reducing EMI (electro magnetic interference), which comprises an inductive current threshold value, wherein when an inductive current is less than the inductive current threshold value, a peak value of the inductive current is controlled to be changed along with an input voltage; and when the inductive current reaches the inductive current threshold value, the inductive current is limited to be the inductive current threshold value. In such a way, the maximum peak of the inductive current is reduced, so that an inductive ripple current is reduced; the power factor is ensured, and the EMI of the circuit is reduced simultaneously, so that circuit filtering can be carried out simply and easily; and the power factor correction control circuit is extremely suitable for occasions with middle or low power. In addition, the peak current stress of the circuit is low, so that a switch tube and other components have small loss, and the utilization ratio of a power supply is further improved. The power factor correction control circuit for reducing the EMI disclosed by the invention meets the requirements of high-power factor and IEC61000-3-2 on the harmonic of the power supply, and has low cost and a small size.
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
Control device with compensatory active PFC (power factor correction) and control method thereof
InactiveCN101777828AGuaranteed power factorReduce dynamic lossEfficient power electronics conversionPower conversion systemsSampling circuitsEngineering
The invention relates to a control device with a compensatory active PFC (power factor correction) and a control method thereof. The control device with the compensatory active PFC comprises an input rectifying unit circuit, a PFC unit circuit and a filtering energy storage unit circuit which are sequentially connected, wherein an input voltage sampling circuit is connected with the output of the input rectifying unit circuit in parallel; a load current sampling circuit is connected between the PFC unit circuit and the input rectifying unit circuit in series; a voltage sampling unit circuit of PFC output voltage is connected with the filtering energy storage unit circuit in parallel; a PFC driving circuit is connected with the PFC unit circuit; a main control unit (MCU) is respectively connected with the input voltage sampling circuit, the PFC driving circuit and the voltage sampling unit circuit; and the MCU comprises any one or a combination of more than two of a voltage compensation correction factor module, a load current correction factor module and a compressor parameter correction module. The invention has the characteristics of flexible operation and reduction of interference, loss and cost.
Owner:MIDEA GRP CO LTD
Power factor correction control circuit capable of reducing EMI
ActiveCN103280965ALighten the filtering burdenGuaranteed power factorEfficient power electronics conversionEnergy industryHarmonicCurrent threshold
The invention discloses a power factor correction control circuit capable of reducing EMI. The control circuit comprises an inductive current threshold value, the peak value of the inductive current is controlled to change along with the input voltage when the inductive current is smaller than the inductive current threshold value, and the inductive current is restrained to the inductive current threshold value when the inductive current reaches the inductive current threshold value. Therefore, the maximum peak of the inductive current is reduced in the above manner, and the inductive ripple current is reduced. The power factor is guaranteed, at the same time, the EMI of the circuit is reduced, the circuit filter task is conducted simply and easily, and the power factor correction control circuit is suitable for sites of medium power and small power. The peak current stress of the circuit is low, a switch tube and other elements wear little, and the power utilization rate is improved further. The power factor correction control circuit capable of reducing the EMI meets the requirements on power supply harmonics of high-efficient factors and IEC61000-3-2, and is low in cost and small in size.
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
Power supply system without passing neutral phases in whole journey of high-speed passenger transport line motor train unit
InactiveCN104015632AImprove securityGuaranteed power factorPower supply linesBasic power supplyDouble phase
The invention relates to a power supply system without passing neutral phases in the whole journey of a high-speed passenger transport line electric multiple units (EMU), and belongs to the field of power supply of high-speed EMU. A cantilever at the upper end of an anchoring section pillar is provided with two catenary wires, the catenary wires are connected with droppers, the droppers are connected with a single-phase alpha contact line and a single-phase beta contact line which are output from the secondary side of a traction transformer, the single-phase alpha and the single-phase beta are parallel, are insulated with each other, are input into the internal power supply system of the EMU through double-phase pantographs and are connected with a basic power supply unit TUB1 and a basic power supply unit TUB2 respectively, and the basic power supply unit TUB1 and the basic power supply unit TUB2 are separate with each other. No circuit breaker switch or neutral insulating section is needed to be arranged on the single-phase alpha and the single-phase beta, and no negative-sequence current generates in a three-phase high-voltage supply network. The invention further provides a circuit structure used for improving a CRH1-model 8-compartment EMU and a CRH5-model 8-compartment EMU into a 6-compartment EMU, a 10-compartment EMU, a 12-compartment EMU and a 16-compartment EMU recombined by two 8-compartment EMUs and for brake regenerative braking.
Owner:JILIN UNIV
Permanent magnet synchronous motor vector control system
InactiveCN1858988AReduce volumeReduce weight and sizeElectronic commutation motor controlVector control systemsSynchronous motorMagnet
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Fan cooling control device and working method thereof
ActiveCN102828983AExtend your lifeIncrease profitFlexible AC transmissionPower network operation systems integrationFailure rateProgrammable logic controller
The invention relates to a fan cooling control device which comprises a temperature detection sensor, a plurality of fans and a PLC (Programmable Logic Controller) module which is connected with the temperature detection sensor and is suitable for controlling working of the fans with the corresponding number and corresponding rotational speeds of the fans according to the external temperature. According to the fan cooling control device disclosed by the invention, the traditional relay circuit is replaced by the PLC module, so that the defects of tedious wiring and high failure rate of relays are avoided; and the fan number and the rotation number are controlled according to the temperature, the fans do not need to started or a few fans are started with low revolution in winter with lower temperature, while all the fans need to be started in summer with high temperature, and the revolution is increased according to the specific temperature, so that a great deal of power is saved, and the service life of a motor is also prolonged.
Owner:CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
Harmonic wave reactive compensation control method based on high-voltage inverter bypass
ActiveCN102946137ABenefit maximizationReduce lossAC motor controlChemical industryPower qualityFrequency changer
The invention discloses a harmonic wave reactive compensation control method based on a high-voltage inverter bypass. A high-voltage inverter failure bypass reactive compensation circuit comprises an inverter, wherein the inverter is connected with a power grid through an wire inlet switch; a wire outlet end of the inverter is connected to a motor through a three-phase reactor and a wire outlet switch sequentially; a wire inlet end of a bypass switch is connected with a wire inlet end of an inverter wire inlet switch; and a wire outlet end of the bypass switch is connected with a wire outlet end of an inverter wire outlet switch. By the harmonic wave reactive compensation control method based on the high-voltage inverter bypass, a high-voltage inverter device can perform reactive compensation in real time according to motor load after the high-voltage inverter automatically switches the failure into the power frequency to operate, the network side power factor is increased, and the quality of electric energy is improved, so that the utilization ratio of the inverter is increased to the maximum degree and the benefit maximization of users is guaranteed.
Owner:南京国电南自新能源科技有限公司
Digital frequency conversion control method for power factor corrector
InactiveCN103780075AReduce lossReduce controlEfficient power electronics conversionPower conversion systemsReference currentActive power factor correction
The invention discloses a digital frequency conversion control method for a power factor corrector. The method comprises the following links: (1) an A / D sampling conversion link: A / D conversion is carried out on ui, iL, uo and io of the power factor corrector through current and voltage sensors to convert the analog values into digital values uiD, iLD, uoD and ioD, which are used as input values of other links; a voltage control link: digital control is carried out on an error value obtained from comparison between the digital value uoD of output voltage and a preset reference voltage value Uref to keep the output voltage stable; a current control link: digital control is carried out on an error value obtained from comparison between the reference current iref provided by the voltage control link and the digital value iLD of inductive current to carry out power factor correction to enable the inductive current to track the input voltage phase; a feedforward link; and a pulse frequency modulation link. The invention aims to provide a digital frequency conversion control method which is capable of reducing the number of peripheral circuits of a controller to the greatest extent under the condition of load change and designed for a power factor corrector.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Surface-mounted permanent magnet motor structure
PendingCN105846580AEasy to assembleFastening method is simpleMagnetic circuit rotating partsHigh volume manufacturingSurface mounting
The invention discloses a surface-mounted permanent magnet motor structure, and belongs to the technical field of motor design. The surface-mounted magnetic steel design provided by the invention belongs to a partially embedded magnetic steel arrangement mode and has a great difference from a general magnetic steel arrangement mode in design emphasis. The structure comprises a stator iron core and a stator winding connected with the stator iron core. A rotor iron core is arranged between the stator iron core and a shaft. The magnetic steel and a welfless band are arranged between the rotor iron core and the stator iron core. Rotor end plates are arranged at two transverse sides of the rotor iron core. Self-cooling centrifugal fan blades are arranged on the rotor end plates. Two sides of the rotor iron core axially close to the shaft are equipped with rotor tensional fastening elements. The structure is simple in structure and low in cost and is suitable for mass production. According to the structure, the motor is ensured to have good speed regulation characteristic and operation reliability.
Owner:NANTONG JINCHI MECHANICAL ELECTRIC
Alternating current-direct current (AC-DC) converter and frequency converter
InactiveCN102055354AControl Current HarmonicsControl the inductance to suppress the current harmonics of the power gridAc-dc conversion without reversalConversion with intermediate conversion to dcFrequency changerPower factor
The invention discloses an alternating current-direct current (AC-DC) converter which comprises a converter based on a three-phase thyristor, a full-bridge converter based on a simplified insulated gate bipolar transistor (IGBT) and an inductor connected between the converter and the full-bridge converter, wherein in a driving mode, the converter based on the three-phase thyristor works in an AC-DC rectifier mode, and the full-bridge converter based on the simplified IGBT works in a boost chopper circuit mode and controls the inductor to suppress current harmonics of the power supply network so as to increase the power factor; and in a regenerative braking mode, the converter based on the three-phase thyristor feeds the regenerated energy back to the power supply system so as to realize energy recovery. The invention also discloses a frequency converter. By using the scheme, the power factor can be increased, energy recovery can be realized, and the implementation cost is low.
Owner:SIEMENS AG
Controller of production clearance reactive power compensation device of power supply and distribution systems of small steel rolling workshop
ActiveCN101630845AThe design idea is simpleSolve the problem that the gap power factor is not up to standardFlexible AC transmissionEnergy industryCapacitanceMathematical model
The invention relates to a controller of a production clearance reactive power compensation device of power supply and distribution systems of a small steel rolling workshop, which belongs to the field of electrical control. The controller comprises a busbar electricity total current signal collector of the power distribution system, a reactive power detection control board (3) of an upper-level network, a rectifier transformer secondary side TSC device control board (4) of the power supply system, a rectifier transformer secondary side controller (5) of the power supply system and a capacitance compensation switching controller (6). The small steel rolling workshop arranges a high-voltage control cabinet at a 10kV busbar, electrical parameters of the 10kV busbar are collected through a voltage and current detection element and a programmable controller, a mathematical model is used for calculation, and communication with a TSC device hung on the secondary side of a rectifier transformer below each section of the busbar is carried out through a network, thereby emitting a capacitor switching control command, carrying out dynamic compensation on reactive power of a power grid, improving power factor of the power supply system under the working condition that a bar production line does not roll steel, ensuring that the power factor of the power supply system achieves the relevant national standards and effectively saving power energy.
Owner:BEIJING SHOUGANG INT ENG TECH
Reactive compensation control method for distributed photovoltaic power station
ActiveCN108365611AGuaranteed complianceSolve the problem that the power factor does not meet the requirements easilyEnergy industrySingle network parallel feeding arrangementsPower factorPower grid
The invention discloses a reactive compensation control method for a distributed photovoltaic power station, and belongs to the field of photovoltaic power generation. The method comprises the steps:determining the actual reactive demand quantity of a property right boundary metering point of an enterprise power grid; determining a static reactive demand quantity of the distributed photovoltaic power station; determining a dynamic reactive compensation quantity according to an instantaneous fluctuation value of an enterprise load voltage and an instantaneous fluctuation value of a voltage ofthe distributed photovoltaic power station; calculating an inductive reactive demand quantity according to the charging power; determining the dynamic reactive demand quantity of the distributed photovoltaic power station according to the dynamic reactive compensation quantity and the inductive reactive demand quantity; determining the configuration information of dynamic compensation equipment and static compensation equipment according to the dynamic reactive compensation quantity and the inductive reactive demand quantity; and controlling the operation of the dynamic compensation equipmentand static compensation equipment according to the configuration information. The method solves a problem that the actual power factor does not meet the requirements after the distributed photovoltaicpower station is added. The method achieves the compensation for the reactive consumption of the distributed photovoltaic power station, and guarantees that the power factor of the property right boundary metering point of the enterprise power grid reaches the standard.
Owner:THE IT ELECTRONICS ELEVENTH DESIGN & RES INST SCI & TECHNOLOGICAL ENG
Novel fixed reactive compensation device
InactiveCN105470977AReduce financial burdenGuaranteed power factorReactive power adjustment/elimination/compensationReactive power compensationInformation analysisPower factor
The invention discloses a novel fixed reactive compensation device. The novel fixed reactive compensation device comprises a voltage transformer, a current transformer, an analog-digital converter, a controllable switch, a digital signal processor, human-machine interaction equipment and a conventional fixed reactive compensation device, wherein the voltage transformer and the current transformer are used for measuring three-phase network voltage and current analog signals in real time; the analog-digital converter is connected with the voltage transformer and the current transformer; the controllable switch is connected onto a main incoming line of all capacitor branch lines in the conventional fixed reactive compensation device; the digital signal processor is used for carrying out reactive tide comprehensive information analysis according to network voltage and current digital signals so as to identify a reactive tide direction and control the human-machine equipment to display reactive tide comprehensive information in real time; when reactive power is sent back to a power grid, the controllable switch is controlled to be disconnected, so that the requirements of reaching the standard of power factors and not sending the reactive power back to the power grid are met by simply modifying the conventional fixed reactive compensation device, and the economical burden of enterprise users is alleviated.
Owner:STATE GRID ZHEJIANG YUYAO POWER SUPPLY +2
Large combined cycle set before-separation automatic idle work reducing method and control device
InactiveCN103259271AInhibition spikesGuaranteed to workReactive power adjustment/elimination/compensationElectric generator controlDistributed control systemPower grid
The invention relates to a large combined cycle set before-separation automatic idle work reducing method and a control device. The method is characterized in that a distributed control system (DCS) is used for detecting the working state of a set, and by controlling exciting currents through an excitation system of the set, the fact that large combined cycle set before-separation idle work is reduced to a target value automatically is achieved. The structure is characterized in that the DCS, a detecting loop and a generator excitation controller AVR are included, the detecting loop is provided with a halt signal detecting end, a generator power utilization end voltage detecting end, an active power detecting end and an idle work detecting end, an output end of the detecting loop is connected with an input end of the DCS, an output end of the DCS is connected with a control input end of the generator excitation controller AVR, and an output end of the generator excitation controller AVR is connected with an input end of the excitation system of the generator set. The large combined cycle set before-separation automatic idle work reducing method and the control device have the advantages that voltage fluctuation caused by the fact that work conditions are changed suddenly, voltages at the generator end can jump because of separation, and a power grid gets rid of a large amount of idle work suddenly can be avoided.
Owner:SHENZHEN GUANGQIAN ELECTRIC POWER
led linear constant current drive circuit
ActiveCN104883798BImprove efficiencyIncrease powerElectric light circuit arrangementAverage currentPower factor
The invention discloses an LED linear constant current drive circuit. The invention can form a first working interval, a second working interval and a third working interval in one power frequency cycle, and the current in the first working interval and the third working interval is greater than In the second working area, a current curve with small two ends is formed in the middle, and the average current value is kept unchanged to realize linear constant current drive control. This solution can improve the efficiency of the linear constant current drive, and also ensure the power factor. At the same time, a temperature feedback is set to control the temperature rise, and the voltage feedforward is introduced as a reference value, which can further improve the efficiency and power factor.
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
Method and control device for automatically reducing reactive power before decommissioning of large combined cycle units
InactiveCN103259271BInhibition spikesGuaranteed to workReactive power adjustment/elimination/compensationElectric generator controlDistributed control systemPower grid
The invention relates to a large combined cycle set before-separation automatic idle work reducing method and a control device. The method is characterized in that a distributed control system (DCS) is used for detecting the working state of a set, and by controlling exciting currents through an excitation system of the set, the fact that large combined cycle set before-separation idle work is reduced to a target value automatically is achieved. The structure is characterized in that the DCS, a detecting loop and a generator excitation controller AVR are included, the detecting loop is provided with a halt signal detecting end, a generator power utilization end voltage detecting end, an active power detecting end and an idle work detecting end, an output end of the detecting loop is connected with an input end of the DCS, an output end of the DCS is connected with a control input end of the generator excitation controller AVR, and an output end of the generator excitation controller AVR is connected with an input end of the excitation system of the generator set. The large combined cycle set before-separation automatic idle work reducing method and the control device have the advantages that voltage fluctuation caused by the fact that work conditions are changed suddenly, voltages at the generator end can jump because of separation, and a power grid gets rid of a large amount of idle work suddenly can be avoided.
Owner:SHENZHEN GUANGQIAN ELECTRIC POWER
Power factor correction control circuit for reducing EMI (electro magnetic interference)
ActiveCN102332814BLighten the filtering burdenThe maximum peak current is reducedEfficient power electronics conversionEnergy industryHarmonicCurrent threshold
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
Fan cooling control device and working method thereof
ActiveCN102828983BExtend your lifeIncrease profitFlexible AC transmissionPower network operation systems integrationFailure rateProgrammable logic controller
The invention relates to a fan cooling control device which comprises a temperature detection sensor, a plurality of fans and a PLC (Programmable Logic Controller) module which is connected with the temperature detection sensor and is suitable for controlling working of the fans with the corresponding number and corresponding rotational speeds of the fans according to the external temperature. According to the fan cooling control device disclosed by the invention, the traditional relay circuit is replaced by the PLC module, so that the defects of tedious wiring and high failure rate of relays are avoided; and the fan number and the rotation number are controlled according to the temperature, the fans do not need to started or a few fans are started with low revolution in winter with lower temperature, while all the fans need to be started in summer with high temperature, and the revolution is increased according to the specific temperature, so that a great deal of power is saved, and the service life of a motor is also prolonged.
Owner:CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
Harmonic wave reactive compensation control method based on high-voltage inverter bypass
ActiveCN102946137BBenefit maximizationReduce lossAC motor controlChemical industryPower qualityFrequency changer
The invention discloses a harmonic wave reactive compensation control method based on a high-voltage inverter bypass. A high-voltage inverter failure bypass reactive compensation circuit comprises an inverter, wherein the inverter is connected with a power grid through an wire inlet switch; a wire outlet end of the inverter is connected to a motor through a three-phase reactor and a wire outlet switch sequentially; a wire inlet end of a bypass switch is connected with a wire inlet end of an inverter wire inlet switch; and a wire outlet end of the bypass switch is connected with a wire outlet end of an inverter wire outlet switch. By the harmonic wave reactive compensation control method based on the high-voltage inverter bypass, a high-voltage inverter device can perform reactive compensation in real time according to motor load after the high-voltage inverter automatically switches the failure into the power frequency to operate, the network side power factor is increased, and the quality of electric energy is improved, so that the utilization ratio of the inverter is increased to the maximum degree and the benefit maximization of users is guaranteed.
Owner:南京国电南自新能源科技有限公司
A control method for the start-up process of a high-power doubly salient motor drive system
ActiveCN104038108BNo impact phenomenonReliable start and runAc motor stoppersDc motor startersPower factorPower control
The invention relates to the technical field of motor control, in particular to a control method of the starting process of a drive system of a high-power double-salient-pole motor. The motor side of the system does not obviously impact the high-power double-salient-pole motor, so that reliable starting and running of the high-power double-salient-pole motor are guaranteed; meanwhile, the power factor of the network side is guaranteed, and the reliability of the system is effectively improved. A soft start switch, an input filter and a network-side converter of the system are connected with a network-side controller to form a network-side control system. The double-salient-pole motor and a motor-side converter are connected with a motor-side driver to form a motor-side control system. One side of the network-side control system is connected with a power grid. The network-side converter and the motor-side converter are connected through a direct-current filtering capacitor in a decoupling mode. The network-side control system and the motor-side control system conduct signal interaction through control ports and coordinate with each other for control. When the direct current side output voltage is constant, the starting current of the double-salient-pole motor is set to be a rated value, the double-salient-pole motor operates in a maximum torque starting control mode, and starting control of the double-salient-pole motor is completed quickly.
Owner:无锡市亿东电子有限公司
High-speed passenger dedicated line EMUs do not have a phase-separated power supply system throughout the process
InactiveCN104015632BImprove securityGuaranteed power factorPower supply linesBasic power supplyDouble phase
Owner:JILIN UNIV
Voltage reactive compensation control device of low-voltage circuit
ActiveCN108092276AGuaranteed voltageGuaranteed power factorPolyphase network asymmetry elimination/reductionAc network voltage adjustmentLow voltage circuitsAutomatic control
Owner:钱才英
High-voltage driving power supply for high-energy ion air purifier
InactiveCN107645239AGuaranteed power factorImprove power factorEfficient power electronics conversionConversion without intermediate conversion to dcChemical LinkageTransformer
The invention discloses a high-voltage driving power supply for a high-energy ion air purifier. The high-voltage driving power supply comprises a voltage-stabilizing frequency converter and a low-frequency boosting transformer that are connected successively. The voltage-stabilizing frequency converter provides a low-frequency alternating-current power supply with the adjustable voltage and frequency for the low-frequency boosting transformer based on purification needs. The low-frequency boosting transformer is used for realizing boosting on the low-frequency alternating-current power supply.The voltage-stabilizing frequency converter consists of a voltage-regulation frequency-modulation module, a control module, a voltage detection module and a current detection module. The output voltage from the high-voltage driving power supply is tracked and given and can be adjusted and thus the high-energy ion energy excited by a high-energy ionizer is higher than the chemical bond energy of gas needing to be purified, so that the chemical bond is broken. The output frequency of the high-voltage driving power supply is determined based on the purification frequency and the ozone concentration, so that the purification efficiency of the high-energy ionizer for gas with different chemical compositions is guaranteed and the concentration of the generated ozone is controlled effectively.
Owner:SHENZHEN CONFIDENT TECH
Controller of production clearance reactive power compensation device of power supply in distribution systems of small steel rolling workshop
ActiveCN101630845BThe design idea is simpleSolve the problem that the gap power factor is not up to standardFlexible AC transmissionEnergy industryCapacitanceBusbar
The invention relates to a controller of a production clearance reactive power compensation device of power supply and distribution systems of a small steel rolling workshop, which belongs to the field of electrical control. The controller comprises a busbar electricity total current signal collector of the power distribution system, a reactive power detection control board (3) of an upper-level network, a rectifier transformer secondary side TSC device control board (4) of the power supply system, a rectifier transformer secondary side controller (5) of the power supply system and a capacitance compensation switching controller (6). The small steel rolling workshop arranges a high-voltage control cabinet at a 10kV busbar, electrical parameters of the 10kV busbar are collected through a voltage and current detection element and a programmable controller, a mathematical model is used for calculation, and communication with a TSC device hung on the secondary side of a rectifier transformer below each section of the busbar is carried out through a network, thereby emitting a capacitor switching control command, carrying out dynamic compensation on reactive power of a power grid, improving power factor of the power supply system under the working condition that a bar production line does not roll steel, ensuring that the power factor of the power supply system achieves the relevant national standards and effectively saving power energy.
Owner:BEIJING SHOUGANG INT ENG TECH
A control method for reactive power compensation of distributed photovoltaic power plants
ActiveCN108365611BGuaranteed complianceSolve the problem that the power factor does not meet the requirements easilyEnergy industrySingle network parallel feeding arrangementsPower compensationPower factor
The invention discloses a reactive compensation control method for a distributed photovoltaic power station, and belongs to the field of photovoltaic power generation. The method comprises the steps:determining the actual reactive demand quantity of a property right boundary metering point of an enterprise power grid; determining a static reactive demand quantity of the distributed photovoltaic power station; determining a dynamic reactive compensation quantity according to an instantaneous fluctuation value of an enterprise load voltage and an instantaneous fluctuation value of a voltage ofthe distributed photovoltaic power station; calculating an inductive reactive demand quantity according to the charging power; determining the dynamic reactive demand quantity of the distributed photovoltaic power station according to the dynamic reactive compensation quantity and the inductive reactive demand quantity; determining the configuration information of dynamic compensation equipment and static compensation equipment according to the dynamic reactive compensation quantity and the inductive reactive demand quantity; and controlling the operation of the dynamic compensation equipmentand static compensation equipment according to the configuration information. The method solves a problem that the actual power factor does not meet the requirements after the distributed photovoltaicpower station is added. The method achieves the compensation for the reactive consumption of the distributed photovoltaic power station, and guarantees that the power factor of the property right boundary metering point of the enterprise power grid reaches the standard.
Owner:THE IT ELECTRONICS ELEVENTH DESIGN & RES INST SCI & TECHNOLOGICAL ENG
An active filter rectifier circuit
ActiveCN109768720BSimple designReduce in quantityEfficient power electronics conversionAc-dc conversionControl signalPower factor
The invention discloses an active filter rectification circuit, which includes a rectification link circuit and a DC link circuit. The rectification link circuit includes an input reactance L1, a main power circuit composed of several power elements, a control circuit, and a sampling circuit. The sampling circuit The collected voltage and current data are sent to the control circuit, the control circuit outputs control signals to the main power circuit, and the alternating current is sent to the main power circuit through the input reactance L1, and the main power circuit converts the alternating current into direct current and sends it to Into the DC conversion link circuit, and output after the DC conversion link. The invention has the advantages that the topological structure design is simple, the input power factor requirement can be met, and the output voltage can be adjusted. The system is equivalent to the traditional two-stage structure, which reduces the number of components, improves the conversion efficiency, and does not require an external low-frequency isolation transformer.
Owner:汲克凤
A motor noise reduction control circuit and method applied to an intelligent clothes dryer
A motor noise reduction control circuit applied to an intelligent laundry machine, including an MCU controller, a phase voltage phase detection module, a current phase detection module, a first and a second drive circuit and a first and a second thyristor; the first , The second thyristor is respectively connected between the AC power supply of the motor and the forward and reverse voltage input terminals of the motor; the MCU controller inputs the phase voltage phase detection signal output by the phase voltage phase detection module and the phase voltage phase detection signal output by the current phase detection module The current phase detects and processes the signal, outputs the first control signal to the first drive circuit, controls the conduction angle of the first thyristor, thereby controls the input voltage of the forward rotation of the motor, or outputs the second control signal to the second drive circuit , to control the conduction angle of the second thyristor, thereby controlling the input voltage for motor reversal. The invention also proposes a motor noise reduction control method applied to the intelligent laundry machine. Even if the motor runs under light load, the present invention does not increase the torque and running speed of the motor, and has low noise.
Owner:GUANGDONG HOTATA TECH GRP
Power factor correction control circuit capable of reducing EMI
ActiveCN103280965BLighten the filtering burdenGuaranteed power factorEfficient power electronics conversionEnergy industryHarmonicCurrent threshold
The invention discloses a power factor correction control circuit capable of reducing EMI. The control circuit comprises an inductive current threshold value, the peak value of the inductive current is controlled to change along with the input voltage when the inductive current is smaller than the inductive current threshold value, and the inductive current is restrained to the inductive current threshold value when the inductive current reaches the inductive current threshold value. Therefore, the maximum peak of the inductive current is reduced in the above manner, and the inductive ripple current is reduced. The power factor is guaranteed, at the same time, the EMI of the circuit is reduced, the circuit filter task is conducted simply and easily, and the power factor correction control circuit is suitable for sites of medium power and small power. The peak current stress of the circuit is low, a switch tube and other elements wear little, and the power utilization rate is improved further. The power factor correction control circuit capable of reducing the EMI meets the requirements on power supply harmonics of high-efficient factors and IEC61000-3-2, and is low in cost and small in size.
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
Alternating current-direct current (AC-DC) converter and frequency converter
InactiveCN102055354BControl Current HarmonicsSuppress harmonic currentAc-dc conversion without reversalConversion with intermediate conversion to dcFrequency changerPower factor
The present invention discloses an AC-DC converter comprising: a three-phase thyristor based converter, a simplified insulated gate bipolar transistor (IGBT) based full-bridge converter, and an inductor connected between them; in the driving mode, the three-phase thyristor based converter works as an AC-DC rectifier, and the simplified IGBT based full-bridge converter works as a boost chopper circuit, and controls the inductor to suppress the current harmonic of the power supply network, so as to increase the power factor; in the regeneration braking mode, the three- phase thyristor based converter feeds the regenerated energy back to the power supply system for energy recovery. The present invention also discloses an inverter. Use of said solution of the present invention can not only increase the power factor, but can also achieve energy recovery at a lower cost.
Owner:SIEMENS AG
High-voltage distribution network reactive power planning method for preventing capacitive reactive power reverse transmission
PendingCN112865128AMeet the assessment requirementsGuaranteed power factorReactive power adjustment/elimination/compensationReactive power compensationDistribution systemGenetics algorithms
The invention discloses a high-voltage power distribution network reactive power planning method for preventing capacitive reactive power reverse transmission. According to the method, a comprehensive reactive power planning model which comprises a reactor and a capacitor and considers power factor constraints is built; according to the model, the simultaneous configuration of the capacitor and the reactor in a high-voltage power distribution system is considered, a minimum sum of reactive compensation equipment investment and active power loss cost in a planning period is taken as an objective function, node power factor constraints are added in the constraints; an improved genetic algorithm based on power factor reactive sensitivity is proposed; and the proposed model is solved, so thata capacitor and reactor reactive planning scheme is obtained; time-sharing switching is carried out in peak and valley periods, the power factor constraints can be met, capacitive reactive power is prevented from being reversely transmitted to a superior power grid; and the problems of reactive power reverse transmission and power factor out-of-limit occur when the high-voltage power distribution network with the peak and valley difference increasing day by day is in low load are solved.
Owner:DONGHUA UNIV
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