WO2021244669A1 - Système de réglage de vitesse à fréquence variable de compresseur et procédé de commande de tension de bus à courant continu - Google Patents

Système de réglage de vitesse à fréquence variable de compresseur et procédé de commande de tension de bus à courant continu Download PDF

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Publication number
WO2021244669A1
WO2021244669A1 PCT/CN2021/107064 CN2021107064W WO2021244669A1 WO 2021244669 A1 WO2021244669 A1 WO 2021244669A1 CN 2021107064 W CN2021107064 W CN 2021107064W WO 2021244669 A1 WO2021244669 A1 WO 2021244669A1
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Prior art keywords
bus voltage
input voltage
voltage
motor
rated
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PCT/CN2021/107064
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English (en)
Chinese (zh)
Inventor
蒲波宇
甘鸿坚
何静飞
安伟国
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浙江鲲悟科技有限公司
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Publication of WO2021244669A1 publication Critical patent/WO2021244669A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H02P25/024—Synchronous motors controlled by supply frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • the invention relates to the field of frequency conversion, in particular to a compressor frequency conversion speed regulation system and a method for controlling the DC bus voltage.
  • the power is above 8kW in the application, generally use the three-phase AC power supply, the front stage uses the uncontrolled rectifier bridge for rectification, and the rear stage uses the IPM module (Intelligent Power Module, intelligent power module). )
  • IPM module Intelligent Power Module, intelligent power module.
  • the shortcomings of this system are that the diodes in the rectifier bridge are uncontrolled devices, and a large amount of low-order harmonic currents will be injected into the grid when the system is working; the second is that the DC bus voltage is uncontrollable, and as the load power increases, the bus voltage The volatility will also increase.
  • the speed regulation of permanent magnet synchronous motor generally takes the rated speed as the demarcation point, the constant flux frequency conversion speed is used below the rated speed, and the weak magnetic frequency conversion speed is used above the rated speed.
  • the field weakening speed increases, since the field current used for field weakening only does useless work, it will increase the loss of the motor and reduce the efficiency of the motor. If you want to keep the magnetic flux constant and increase the speed above the rated speed, the motor back EMF will inevitably increase. At this time, the output voltage of the inverter inverter module, that is, the terminal voltage of the motor must increase accordingly.
  • the prior art uses a software overmodulation algorithm, but the voltage amplitude that this method can increase is limited, and the motor performance can only be slightly improved.
  • the purpose of the present invention is to provide a compressor frequency conversion speed regulation system and a DC bus voltage control method, which is used to solve the problem of low-order harmonics and low system efficiency in the prior art. problem.
  • the present invention provides a method for controlling the DC bus voltage in a compressor frequency conversion speed regulation system.
  • the control method of the DC bus voltage in the compressor frequency conversion speed regulation system at least includes:
  • the DC bus voltage is output according to the AC input voltage and the motor speed.
  • the DC bus voltage is set to a fixed value higher than the peak value of the rated AC input voltage
  • the DC bus voltage is set to be higher than the peak value of the actual AC input voltage, and the DC bus voltage follows The actual AC input voltage changes;
  • the minimum value of the second preset ratio range is greater than or equal to the maximum value of the first preset ratio range.
  • the DC bus voltage is set to be higher than the actual AC input voltage , The DC bus voltage changes with the change of the actual AC input voltage;
  • the power switch tube in the rectifier module is turned off, and the uncontrolled rectification mode is entered.
  • the relationship curve between the motor speed and the DC bus voltage is calculated; the DC bus corresponding to the motor speed is obtained from the relationship curve Voltage; if the DC bus voltage is lower than the peak value of the actual AC input voltage, the DC bus voltage is adjusted to be higher than the peak value of the actual AC input voltage.
  • the method of calculating the relationship curve between the motor speed and the DC bus voltage includes:
  • the relationship curve is determined by connecting the first end point and the second end point.
  • the method for calculating the relationship curve between the motor speed and the DC bus voltage further includes: adding end points of the relationship curve based on actual test data, and determining the relationship curve after each end point is connected in sequence.
  • the field weakening speed-up mode is entered.
  • the present invention also provides a compressor frequency conversion speed regulation system, which implements the above-mentioned method for controlling the DC bus voltage in the compressor frequency conversion speed regulation system, and the compressor frequency conversion speed regulation system at least includes:
  • a rectifier module which receives an AC input voltage and converts the AC input voltage into a DC bus voltage
  • An inverter module connected to the output terminal of the rectifier module, and converts the DC bus voltage into a motor drive voltage
  • a motor connected to the output terminal of the inverter module, and driven by the motor drive voltage to run;
  • the control module is connected to the motor, the rectifier module and the inverter module, and is used to generate control signals of the rectifier module and the inverter module.
  • the rectification module is an active rectification module; or the rectification module includes a passive rectification unit and a boosting unit, and the boosting unit is connected to the output end of the passive rectification unit.
  • the active rectifier module is a VIENNA rectifier module.
  • the VIENNA rectifier module includes six diodes, three inductors, six power switches, and two sets of capacitors; each diode is connected in series in the same direction and then connected in parallel, and the connection node of the first group of series diodes passes through the first The inductor is connected to the first phase of the AC input voltage, the connection node of the second group of series diodes is connected to the second phase of the AC input voltage via the second inductor, and the connection node of the third group of series diodes is connected to the second phase of the AC input voltage via the third inductor.
  • each power switch tube is connected in reverse series in pairs between the connection node of each group of series diodes and the connection node of the two groups of capacitors.
  • the compressor frequency conversion speed regulation system and the DC bus voltage control method of the present invention have the following beneficial effects:
  • the front stage of the compressor frequency conversion speed regulation system of the present invention adopts an active rectifier module, which greatly reduces the low-order harmonics of the power grid.
  • the rectifier module is controlled to increase the DC bus voltage, so that the motor delays entering the field weakening zone and improves the efficiency of the motor.
  • the compressor frequency conversion speed regulation system and the DC bus voltage control method of the present invention integrate the permanent magnet synchronous motor's full speed range working conditions and AC input voltage fluctuations, so that the frequency conversion speed regulation system is in the most efficient working mode.
  • Figure 1 shows a schematic diagram of the structure of a compressor frequency conversion speed regulation system in the prior art.
  • Fig. 2 shows a schematic flow chart of the method for controlling the DC bus voltage in the compressor variable frequency speed regulation system of the present invention.
  • Figure 3 shows a schematic diagram of the structure of the compressor variable frequency speed regulation system of the present invention.
  • this embodiment provides a method for controlling the DC bus voltage in a compressor variable frequency speed regulation system.
  • the method for controlling the DC bus voltage in the compressor variable frequency speed regulation system includes:
  • the DC bus voltage is output according to the AC input voltage and the motor speed.
  • the method for controlling the DC bus voltage in the compressor frequency conversion speed regulation system specifically includes the following steps:
  • the DC bus voltage is further set based on the fluctuation range of the actual AC input voltage (through closed-loop control, the actual voltage of the DC bus is always Track the preset voltage of the DC bus).
  • the rectifier module is controlled to set the DC bus voltage Vbus to be higher than the peak value of the rated AC input voltage Vra, and the DC The bus voltage Vbus remains constant (fixed value), and will not become lower as the actual AC input voltage Vab becomes lower or as the load of the motor becomes larger, so that the efficiency of the subsequent inverter modules will also be obtained improve.
  • the rated AC input voltage Vra is set to 380V, and the DC bus voltage Vbus satisfies the following relationship:
  • the value of the rated AC input voltage Vra can be set according to actual conditions, and it will be different in different countries or regions.
  • the three-phase line voltage of the power grid in China is 380V, which will not be repeated here.
  • the DC bus voltage Vbus is set to 101% of the peak value of the rated AC input voltage Vra.
  • the DC bus voltage Vbus and the rated AC input voltage can be set as required
  • the proportional relationship of the peak value of Vra as an example, can be set to 100%-105% (not including the end point 100%, including the end point 105%), and is not limited to this embodiment.
  • the rectifier module is controlled to set the DC bus voltage Vbus to be higher than the actual AC input voltage Vab
  • the DC bus voltage Vbus changes with the change of the actual AC input voltage Vab, so as to ensure that the rectifier module can work normally. This is because the rectifier module has a boost function, so the DC bus voltage must be higher than the peak value of the actual AC input voltage before the rectifier module can work normally.
  • the DC bus voltage Vbus is set to 101% of the peak value of the actual AC input voltage Vab. In actual use, the DC bus voltage Vbus can be set as required.
  • the proportional relationship of the actual AC input voltage Vab peak value can be set to 100%-105% as an example (not including the terminal 0%, including the terminal 5%), and is not limited to this embodiment.
  • the power switch in the rectifier module is turned off, that is, the control module in the system does not output a PWM drive signal and outputs a fault signal.
  • the inverter side can run at reduced load or soft stop.
  • the fault signal includes, but is not limited to, an undervoltage protection signal and an overvoltage protection signal, which will not be repeated here.
  • each preset ratio range can be set according to actual needs, and the minimum value of the second preset ratio range is greater than or equal to the maximum value of the first preset ratio range, which will not be repeated here.
  • the rectifier module is controlled to increase the DC bus voltage Vbus, so that the motor delays entering the field weakening zone.
  • the relationship curve uses the motor speed as the abscissa and the DC bus voltage as the ordinate. More specifically, the first end point of the relationship curve is determined by using the rated speed of the motor and the preset value higher than the peak value of the rated AC input voltage Vra as the abscissa and ordinate.
  • the motor speed corresponds to the rated speed of the motor
  • the DC bus voltage Vbus corresponds to a preset value higher than the peak value of the rated AC input voltage Vra, so as to determine the first end of the relationship curve point.
  • the rated speed of the motor is 6000 rpm
  • the preset value is set to 101% of the peak value of the rated AC input voltage Vra.
  • the DC bus voltage Vbus and the The proportional relationship of the peak value of the rated AC input voltage Vra can be set to 100%-105% (not including the terminal 100%, including the terminal 105%), and is not limited to this embodiment.
  • the second end of the relationship curve is determined by the motor speed corresponding to the maximum value Vbus_max of the DC bus voltage and the maximum value Vbus_max of the DC bus voltage.
  • the DC bus voltage Vbus corresponds to the maximum value of the DC bus voltage Vbus_max
  • the motor speed corresponds to the motor speed when the maximum value of the DC bus voltage Vbus_max, so as to determine the relationship The second end of the curve.
  • first end point and the second end point are then connected to determine the relationship curve.
  • the first end point is connected to the second end point, and the straight line thus obtained is the relationship curve.
  • the endpoints of the relationship curve are added, and the curve obtained after each endpoint is connected in sequence is the relationship curve.
  • the number of added endpoints can be set according to needs, and will not be repeated here.
  • the DC bus voltage Vbus corresponding to the motor speed is obtained from the relationship curve according to the preset speed of the motor or the actual speed of the detected motor (through closed-loop control, the actual speed of the motor always tracks the preset speed of the motor).
  • the DC bus voltage Vbus meets the requirements, that is, if the DC bus voltage Vbus is lower than the peak value of the actual AC input voltage Vab, the DC bus voltage Vbus is adjusted to be higher than the actual AC input The peak value of the voltage Vab; otherwise, it will not be adjusted, and the value obtained on the relationship curve shall prevail; this will determine the DC bus voltage Vbus.
  • This embodiment adopts an active rectifier module, which greatly reduces the low-order harmonics of the power grid; when the speed is below the rated speed, the influence of the power grid is considered, and the efficiency of the inverter module is improved by controlling the DC bus voltage to change with the power grid; When the rated speed is above the rated speed, the rectifier module is controlled to increase the DC bus voltage, which delays the entry of the motor into the field weakening zone and improves the efficiency of the motor; comprehensive permanent magnet synchronous motor full speed range working conditions and AC input voltage fluctuations make the variable frequency speed regulation system In the most efficient working mode.
  • This embodiment provides a method for controlling the DC bus voltage in a compressor variable frequency speed regulation system.
  • the difference from the first embodiment is that when the actual AC input voltage Vab is at the second preset value of the rated AC input voltage Vra When fluctuating within the range of the ratio, different processing is performed according to different sub-intervals.
  • the rectifier module is controlled to set the DC bus voltage Vbus to be higher than the peak value of the rated AC input voltage Vra, and The DC bus voltage Vbus remains constant (fixed value).
  • the rectifier module is controlled to set the DC bus voltage Vbus higher than the The peak value of the actual AC input voltage Vab, and the DC bus voltage Vbus changes with the change of the actual AC input voltage Vab.
  • the range of the second sub-interval can be set according to needs, and the power switch tube in the rectifier module is turned off when the internal fluctuation is not limited to this embodiment, that is, the control module in the system does not output PWM
  • the drive signal enters the uncontrolled rectification mode.
  • the uncontrolled rectification mode can reduce the switching loss of the rectifier module;
  • the power switch tube in the rectifier module is turned off and a fault signal is output.
  • this embodiment provides a compressor frequency conversion speed regulation system 1, and the compressor frequency conversion speed regulation system 1 includes:
  • Rectifier module 11 inverter module 12, motor 13 and control module 14.
  • the rectifier module 11 receives an AC input voltage and converts the AC input voltage into a DC bus voltage Vbus.
  • the rectifier module 11 is a VIENNA rectifier module in an active rectifier module, and various variations of VIENNA topology are applicable to the rectifier module 11 of the present invention.
  • the rectifier module 11 includes six diodes, three inductors, six power switch tubes, and two sets of capacitors (the two sets of capacitors can be a single capacitor or a combination of multiple capacitors in series and parallel), and the upper and lower two sets of capacitors The capacitance value is the same.
  • Each diode is connected in parallel in series in the same direction, that is: the cathode of the first diode D1 is connected to the anode Vbus+ of the DC bus voltage, and the anode is connected to the cathode of the second diode D2; The anode is connected to the cathode Vbus- of the DC bus voltage; the cathode of the third diode D3 is connected to the anode Vbus+ of the DC bus voltage, and the anode is connected to the cathode of the fourth diode D4; The anode is connected to the negative pole Vbus- of the DC bus voltage; the cathode of the fifth diode D5 is connected to the positive pole Vbus+ of the DC bus voltage, and the anode is connected to the cathode of the sixth diode D6; The anode is connected to the cathode Vbus- of the DC bus voltage V.
  • connection node of the first diode D1 and the second diode D2 is connected to the first phase L1 of the AC input voltage, and the third diode D3 and the fourth diode D4 are connected to each other.
  • the connection node is connected to the second phase L2 of the AC input voltage, and the connection node of the fifth diode D5 and the sixth diode D6 is connected to the third phase L3 of the AC input voltage.
  • Each phase of the AC input voltage is input through an inductor (the first inductor L11, the second inductor L12, and the third inductor L13) respectively.
  • the first group of capacitors C1 and the second group of capacitors C2 are connected in series and connected between the positive pole Vbus+ and the negative pole Vbus- of the DC bus voltage.
  • Each power switch tube is connected in reverse series in pairs, respectively, between the connection node of each group of series diodes and the connection node of the two sets of capacitors, that is: the collector of the first power switch tube Q11 is connected to the first diode D1 With the connection node of the second diode D2, the emitter is connected to the emitter of the second power switch Q12; the collector of the second power switch Q12 is connected to the first group of capacitors C1 and the second The connection node of the group capacitor C2; the collector of the third power switch Q13 is connected to the connection node of the third diode D3 and the fourth diode D4, and the emitter is connected to the emitter of the fourth power switch Q14 The collector of the fourth power switch tube Q14 is connected to the connection node of the first group of capacitors C1 and the second group of capacitors
  • the power grid in this embodiment is a three-phase four-wire system (three live wires and one ground wire). If it is a three-phase five-wire system (three live wires, one neutral wire and one ground wire), the neutral wire is connected to two sets of capacitors. Connection node.
  • each power switch tube adopts an insulated gate bipolar transistor, and the type of each power switch tube can be set according to needs in actual use.
  • the rectifier module 11 can be any controllable active rectifier module; it can also include a passive rectifier unit and a booster unit, the booster unit is connected to the output end of the passive rectifier unit; in order to achieve controllability Rectification is not limited to this embodiment.
  • the inverter module 12 is connected to the output terminal of the rectifier module 11, and converts the DC bus voltage Vbus into a motor drive voltage.
  • the six power switch tubes of the inverter module 12 constitute a three-phase inverter bridge, wherein the seventh power switch tube Q21 and the eighth power switch tube Q22 are connected in series to the DC bus voltage Between the positive pole Vbus+ of the DC bus voltage and the negative pole Vbus- of the DC bus voltage (the collector of the seventh power switch tube Q21 is connected to the positive pole Vbus+ of the DC bus voltage, and the emitter is connected to the collector of the eighth power switch tube Q22.
  • the emitter of the eighth power switch tube Q22 is connected to the negative pole Vbus-) of the DC bus voltage;
  • the ninth power switch tube Q23 and the tenth power switch tube Q24 are connected in series to the positive pole Vbus+ of the DC bus voltage and the Between the negative pole Vbus- of the DC bus voltage (the connection port is the same as the seventh power switch Q21 and the eighth power switch Q22, and will not be repeated here);
  • the eleventh power switch Q25 and the first Twelve power switch tubes Q26 are connected in series between the positive pole Vbus+ of the DC bus voltage and the negative pole Vbus- of the DC bus voltage (the connection port is the same as the seventh power switch tube Q21 and the eighth power switch tube Q22 , Which will not be repeated here); each power switch tube in the inverter module 12 is connected to a control signal.
  • each power switch tube in the inverter module 12 is an insulated gate bipolar transistor, and the type of each power switch tube can be set as required in actual use.
  • the inverter module 12 can choose any structure according to needs, and is not limited to this embodiment.
  • the motor 13 is connected to the output terminal of the inverter module 12, and is driven by the motor driving voltage.
  • the motor 13 is a permanent magnet synchronous motor.
  • a three-phase alternating current is applied to the three-phase stator windings of the motor, a rotating magnetic field will be generated, and the rotating magnetic field will drive the rotor to rotate synchronously.
  • the motor 13 may also be other three-phase motors such as an AC asynchronous motor, which will not be repeated here.
  • control module 14 is connected to the motor 13, the rectifier module 11 and the inverter module 12 to generate control signals of the rectifier module 11 and the inverter module 12.
  • control module 14 collects the AC input voltage and the signal on the motor 13, and controls the rectifier module 11 and the inverter module 12 to implement the first embodiment or the second embodiment.
  • the control method of the DC bus voltage in the compressor frequency conversion speed regulation system of the compressor realizes the speed regulation of the motor 13.
  • the first embodiment and the second embodiment which will not be repeated here.
  • the compressor frequency conversion speed regulation system of this embodiment greatly reduces the low-order harmonics of the power grid and improves the system efficiency.
  • the compressor frequency conversion speed regulation system (including the controlled motor) is always in the highest efficiency working mode, which is suitable for industrial applications .
  • the present invention provides a compressor frequency conversion speed regulation system and a DC bus voltage control method, including: a rectifier module, which receives an AC input voltage and converts the AC input voltage into a DC bus voltage; an inverter module , Connected to the output terminal of the rectifier module to convert the DC bus voltage into a motor drive voltage; a motor, connected to the output terminal of the inverter module, and operated by the motor drive voltage; a control module, connected to the The motor, the rectifier module, and the inverter module are used to generate control signals of the rectifier module and the inverter module; when the motor runs below the rated speed, the DC bus voltage is output according to the AC input voltage; When the motor runs above the rated speed, the DC bus voltage is output according to the AC input voltage and the speed of the motor.
  • the front stage of the compressor variable frequency speed regulation system of the present invention adopts an active rectifier module, which greatly reduces the low-order harmonics of the power grid; when the speed is below the rated speed, the influence of the power grid is considered, and the DC bus voltage is controlled to change with the power grid. , Improve the efficiency of the inverter module; when the rated speed is higher than the rated speed, the rectifier module is controlled to increase the DC bus voltage, which delays the entry of the motor into the field weakening zone and improves the efficiency of the motor; comprehensive permanent magnet synchronous motor full speed range working conditions and AC The input voltage fluctuates, so that the variable frequency speed regulation system is in the most efficient working mode. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial value.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un système de réglage de vitesse à fréquence variable de compresseur et un procédé de commande pour une tension de bus à courant continu, comprenant : un module redresseur, pour convertir une tension d'entrée à courant alternatif en une tension de bus à courant continu ; un module onduleur destiné à convertir la tension de bus à courant continu en une tension de commande de moteur électrique ; un moteur électrique, entraîné par la tension de commande de moteur électrique pour son fonctionnement ; et un module de commande, utilisé pour ajuster la tension de bus à courant continu fournie par le module redresseur. Lorsque le moteur électrique fonctionne en dessous d'une vitesse de rotation nominale, la tension de bus à courant continu est fournie sur la base de la tension d'entrée à courant alternatif ; et, lorsque le moteur électrique fonctionne au-dessus de la vitesse de rotation nominale, la tension de bus à courant continu est fournie sur la base de la tension d'entrée à courant alternatif et de la vitesse de rotation du moteur électrique. Le procédé de commande réduit considérablement les harmoniques d'ordre inférieur d'un réseau de distribution d'électricité, augmente l'efficacité du système et met le système de réglage de vitesse à fréquence variable dans le mode de travail le plus efficace.
PCT/CN2021/107064 2020-06-05 2021-07-19 Système de réglage de vitesse à fréquence variable de compresseur et procédé de commande de tension de bus à courant continu WO2021244669A1 (fr)

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Application Number Priority Date Filing Date Title
CN202010507297.6A CN111628660B (zh) 2020-06-05 2020-06-05 压缩机变频调速系统及直流母线电压的控制方法
CN202010507297.6 2020-06-05

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