CN113783460A - Variable-frequency pulse power supply for electric desalting and generation method thereof - Google Patents

Variable-frequency pulse power supply for electric desalting and generation method thereof Download PDF

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Publication number
CN113783460A
CN113783460A CN202010499225.1A CN202010499225A CN113783460A CN 113783460 A CN113783460 A CN 113783460A CN 202010499225 A CN202010499225 A CN 202010499225A CN 113783460 A CN113783460 A CN 113783460A
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power supply
low
inverter
voltage
inverter device
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马宗煊
黄志超
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Xiamen Rech Technology Co ltd
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Xiamen Rech Technology Co ltd
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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
    • H02M11/00—Power conversion systems not covered by the preceding groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G33/00—Dewatering or demulsification of hydrocarbon oils
    • C10G33/02—Dewatering or demulsification of hydrocarbon oils with electrical or magnetic means
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M5/02—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 without intermediate conversion into dc
    • H02M5/04—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 without intermediate conversion into dc by static converters
    • H02M5/10—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 without intermediate conversion into dc by static converters using transformers
    • H02M5/16—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 without intermediate conversion into dc by static converters using transformers for conversion of frequency
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a variable frequency pulse power supply for electric desalting and a generation method thereof.A main-auxiliary two-way inverter is adopted, a first inverter is connected with low-voltage alternating current, a second inverter is connected with an energy storage capacitor, the first inverter provides a bipolar low-voltage pulse power supply in a positive period, then a pulse transformer is used for boosting to form a high-voltage direct current pulse power supply, and when the current of the low-voltage pulse power supply in the positive period or the negative period reaches an upper limit value, the energy storage capacitor absorbs follow current energy of the pulse transformer device through the auxiliary inverter; after the energy storage of the energy storage capacitor, the second inverter and the first inverter are superposed to output a low-voltage pulse power supply. By the generation method, the follow current energy of the pulse transformer device can be recovered when the low-voltage pulse power supply outputs, and the power supply efficiency is improved.

Description

Variable-frequency pulse power supply for electric desalting and generation method thereof
Technical Field
The invention relates to the technical field of electric desalting, in particular to a variable-frequency pulse power supply for electric desalting and a generation method thereof.
Background
The crude oil contains water, also contains natural emulsifiers such as colloid, asphaltene and the like, during the process of exploitation and transportation of the crude oil, due to severe disturbance, the water is dispersed in the crude oil in a micro-droplet state, the emulsifiers in the crude oil are concentrated on an oil-water interface by virtue of adsorption to form a firm molecular film to form stable emulsion, the stability degree of the emulsion depends on the properties and the concentration of the emulsifiers, the properties of the crude oil, the water dispersion degree, the time for forming the emulsion and other factors, the crude oil is strongly stirred mechanically, the concentration of the emulsifiers is high, the viscosity of the crude oil is high, the time for forming the emulsion is long, and the stability degree of the emulsion is increased. The electric desalting of crude oil is mainly to add demulsifier to destroy the emulsified state, and to make the micro water drop coalesce into large water drop under the action of electric field to separate oil from water. Since most of the salts in the crude oil are dissolved in water, desalting and dewatering are performed simultaneously.
The dehydration and desalination of crude oil need a high-power supply to provide high voltage and strong electric field to complete oil-water separation, and the energy consumption is high. At present, the electro-desalting technology generally adopts an inverter to output a high-voltage pulse power supply for pulse desalting so as to realize high efficiency and energy conservation, but the energy consumption is still high, so that the technical personnel in the field are continuously improving so as to further improve the energy efficiency of the electro-desalting technology.
The inverter adopts a full bridge or a half bridge to form a power conversion circuit, works by utilizing the area equivalent principle, the control end adopts carrier waves and target waveforms to be jointly modulated into PWM and then finally outputs the target waveforms through an inertia link, the realization of the pulse is realized by basically adopting an intermittent power supply mode, the pulse distortion is large, the switching frequency of a power device is several times of the output frequency, and the reliability is poor.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the problems to be solved by the present invention are: how to improve the efficiency of the inverter output of the variable frequency pulse power supply and improve the reliability.
The variable-frequency pulse power supply for electric desalting controls the output of the inverter not by using an area equivalent principle, but by adopting a mode that carrier waves are pure pulse output of a target waveform, the generated pulse waveform does not pass through an inertia link and a switching frequency, namely, the output frequency, the switching frequency of an inversion power device is reduced, the reliability of the inversion power device is improved, the output pulse is a true pulse which does not pass through any link, and the pulse efficiency can reach 98%.
The invention also adopts a mode of cascading two H-bridge inversion modules, can work in a mode that the two inversion modules are simultaneously connected in series to output pulses (pulse peak voltage is improved), the two inversion modules are instantaneously connected in parallel to output (the same switching frequency output frequency is doubled, the reliability of the inverter is greatly improved), and the two modules are mutually hot-backed up: when one module fails, the other module automatically supplies power to output.
In normal cascade inversion, each inversion module needs to provide isolated direct current power supply independently, and as long as one module supplies the direct current power supply, the other module automatically extracts direct current bus voltage from a main circuit, so that power supply loops of a system are reduced, the cost is reduced, and the system is more reliable.
In order to achieve the purpose, the invention provides the following technical scheme:
a variable frequency pulsed power supply for electrical desalination comprising:
the low-voltage direct-current power supply device comprises a rectifier and a filtering device and is used for rectifying and filtering low-voltage alternating current and outputting a first low-voltage direct-current power supply with an adjusted amplitude;
the energy storage device is used for reverse-period energy storage and outputting a second low-voltage direct-current power supply after the energy storage is finished;
the first inversion device is connected with the first low-voltage direct-current power supply device and is used for carrying out inversion processing on the first low-voltage direct-current power supply;
the second inversion device is connected with the energy storage device and used for providing a path for the energy storage device to store energy in an inverse period or performing inversion processing on the second low-voltage direct-current power supply; the low-voltage pulse power supply is cascaded with the first inversion device, and the output amplitude of the low-voltage pulse power supply is adjusted through duty ratio modulation, wherein the low-voltage pulse power supply is a bipolar low-voltage pulse power supply or a multi-polarity low-voltage pulse power supply;
the pulse transformer device is connected with the first inverter device and the second inverter device which are cascaded and used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the reactance value of the input end of the pulse transformer device is matched with the capacitance value of the energy storage device;
the detection device is used for monitoring the current and the voltage of the low-voltage pulse power supply and acquiring output parameters;
and the control device is respectively connected with the first low-voltage direct-current power supply device, the first inverter device, the second inverter device and the detection device, and is used for controlling the reverse-period energy storage time of the energy storage device and adjusting the amplitude of the low-voltage direct-current power supply and the amplitude and frequency of the low-voltage pulse power supply according to the output parameters.
Further, a matching formula for matching the reactance value of the input end of the pulse transformer device with the capacitance value of the energy storage device is as follows: c ═ L ═ I)/(U2) Wherein: c is the capacitance value of the energy storage device, L is the reactance value of the primary side of the pulse transformer device, I is the instantaneous average value of the current flowing through the primary side of the pulse transformer device, and U is the voltage for charging the energy storage device.
Furthermore, the first inverter device and the second inverter device both comprise a group of H-bridge inverters and an inverter driving circuit, the control device drives the H-bridge inverters through the inverter driving circuit, and switch tubes of the H-bridge inverters are connected with protection diodes in parallel.
Furthermore, all the switch tubes of the H-bridge inverter are MOS tubes or all the switch tubes are IGBT transistors.
Further, the energy storage device and the filtering device are capacitor banks.
Further, the rectifier is a three-phase silicon controlled rectifier.
Further, the control device includes:
the parameter acquisition module is connected with the detection device and used for receiving output parameters from the detection device;
the first low-voltage direct-current power supply control module is connected with the first low-voltage direct-current power supply device and used for adjusting the amplitude of the first low-voltage direct-current power supply;
the pulse width modulation module is connected with the first inverter device and the second inverter device and used for adjusting the amplitude of the bipolar low-voltage pulse power supply in a pulse width modulation mode;
and the central processing module is respectively connected with the parameter acquisition module, the first low-voltage direct-current power supply control module and the pulse width modulation module and is used for controlling the amplitude of the first low-voltage direct-current power supply output by the first low-voltage direct-current power supply device through the low-voltage direct-current power supply control module, controlling the low-voltage pulse power supply output by the first inverter device and the second inverter device in a cascading manner through the pulse width modulation module and controlling the reverse-period energy storage time of the energy storage device according to the output parameters.
In order to achieve the above object, the present invention further provides a method for generating a variable frequency pulse power supply, which is applied to the variable frequency pulse power supply, and comprises:
a first period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in a bypass mode, and providing a positive-period low-voltage pulse power supply by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
second period: when the current of the positive-period low-voltage pulse power supply reaches an upper limit value, the first inverter device is set to be in a bypass mode, all switching tubes of the second inverter device are turned off, and the follow current energy of the pulse transformer device charges the energy storage device through the protection diode of the switching tube of the second inverter device;
in the third period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in a bypass mode, and providing a low-voltage pulse power supply with a negative period by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
the fourth period: when the current of the negative-period low-voltage pulse power supply reaches an upper limit value, the first inverter device is set to be in a bypass mode, all switching tubes of the second inverter device are turned off, and the follow current energy of the pulse transformer device charges the energy storage device through the protection diodes of the switching tubes;
a fifth period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in the chopping mode, and providing a positive-period low-voltage pulse power supply by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the first inverter device and the second inverter device are connected in series to output voltage together, and a positive-period low-voltage series-connection superposition pulse power supply is provided;
a sixth period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in the chopping mode, and providing a low-voltage pulse power supply with a negative period by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the first inverter device and the second inverter device are connected in series to output voltage together, and a low-voltage series-connection superposition pulse power supply with a negative period is provided;
the chopping mode is single-pulse output control of the inverter device, and a positive periodic path from the positive pole of the inverter device to the first output to the second output to the lower bridge arm to the negative pole of the inverter device is established, or a negative periodic path from the positive pole of the inverter device to the second output to the first output to the lower bridge arm to the negative pole of the inverter device is established;
the bypass mode is that two outputs of the inverter are in short circuit together through two lower bridge arms or two upper bridge arms of the inverter by conducting control over two upper bridge arms or two lower bridge arm switching tubes of the inverter.
The invention provides a variable frequency pulse power supply for electric desalting and a generation method thereof.A main-auxiliary two-way inverter is adopted, a first inverter is connected with low-voltage alternating current, a second inverter is connected with an energy storage device, the first inverter provides a bipolar low-voltage pulse power supply in a positive period, then a pulse transformer is used for boosting to form a high-voltage direct current pulse power supply, and when the current of the low-voltage pulse power supply in the positive period reaches an upper limit value, the energy storage device absorbs follow current energy of the pulse transformer device through the auxiliary inverter; the second inverter extracts the energy storage of the energy storage device in the negative period and outputs the bipolar low-voltage pulse power supply. By the generation method, the follow current energy of the pulse transformer device can be recovered when the low-voltage pulse power supply outputs, and the power supply efficiency is improved.
Drawings
FIG. 1 is a system block diagram of a variable frequency pulsed power supply of the present invention;
FIG. 2 is a circuit diagram of a variable frequency pulsed power supply of an embodiment of the present invention;
fig. 3 is a waveform diagram of a low voltage pulsed power supply of an embodiment of the present invention.
Reference numerals:
1. a three-phase rectifier; 2. a first capacitor; 3. a first inverter device; 4. a second capacitor; 5. a second inverter device; 6. a DSP controller; 7. a detection device; 8. a pulse transformer device.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in figures 1-3, the invention discloses a variable frequency pulse power supply for electric desalting, which is connected with 380V three-phase alternating current at the input and comprises a three-phase rectifier 1, a first capacitor 2, a first inverter 3, a second capacitor 4, a second inverter 5, a DSP controller 6, a detection device 7, a pulse transformer device 8 and other functional modules.
The three-phase rectifier 1 and the first capacitor 2 form a low-voltage direct-current power supply device, the low-voltage direct-current power supply device is used for rectifying and filtering input low-voltage alternating current and outputting a first low-voltage direct-current power supply with an adjusted amplitude; in this embodiment, the three-phase rectifier is a three-phase silicon controlled rectifier, and the amplitude of the first low-voltage direct-current power supply is adjusted by controlling a trigger angle of the silicon controlled rectifier;
the second capacitor 4 is used for reverse-period energy storage and outputting a second low-voltage direct-current power supply after the energy storage is finished; the first capacitor 2 and the second capacitor 4 are capacitor banks.
The first inversion device 3 is connected with the first capacitor 2 and is used for inverting the first low-voltage direct-current power supply;
the second inverter device 5 is connected with the second capacitor 4 and is used for providing a path for the second capacitor 4 to store energy in an inverse period or inverting the second low-voltage direct-current power supply; the low-voltage pulse power supply is cascaded with the first inverter 3 and outputs a low-voltage pulse power supply with an adjusted amplitude value through duty ratio modulation;
the pulse transformer device 8 is connected with the first inverter device 3 and the second inverter device 5 which are cascaded and is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; in this application the reactance value at the input of the pulse transformer means 8 is matched to the capacitance value of the second capacitor 4 and is thus oscillating. The matching formula of the reactance value and the capacitance value is as follows: c ═ L ═ I)/(U2) Wherein: c is the capacitance of the second capacitor 4, L is the reactance of the input of the pulse transformer device 8, I is the instantaneous average value of the current flowing through the primary of the transformer, and U is the voltage charged by the capacitor.
The detection device 7 is a group of voltage and current detection circuits and is used for monitoring the current and the voltage of the low-voltage pulse power supply and acquiring output parameters;
and the DSP controller 6 is respectively connected with the low-voltage direct-current power supply device, the first inverter device 3, the second inverter device 5 and the detection device 7, and is used for controlling the reverse-period energy storage time of the energy storage device and adjusting the amplitude of the low-voltage direct-current power supply and the amplitude and frequency of the low-voltage pulse power supply according to the output parameters.
In this embodiment, the low-voltage ac power refers to 380V ac power. In the crude oil electric desalting application applied in the embodiment, the voltage of the high-voltage direct current pulse power supply is dozens of kilovolts.
As shown in fig. 2, the first inverter device 3 and the second inverter device 5 are arranged in a cascade, which is described in detail below.
The first inverter device 3 and the second inverter device 5 both comprise a group of H-bridge inverters and an inverter driving circuit, and the DSP controller 6 drives the H-bridge inverters through the inverter driving device.
The H-bridge inverter of the first inverter 3 is composed of four switching tubes S1, S2, S3 and S4, the switching tubes may be MOS transistors (insulated gate field effect transistors) or IGBT transistors (insulated gate bipolar transistors), and each switching tube has a protection diode bridged between a source electrode and a drain electrode, wherein the switching tubes S1 and S3 are connected to a positive power supply of the first inverter 3, and the switching tubes S2 and S4 are connected to a negative power supply of the first inverter 3.
A first output end A1 of the first inverter 3 is led out from the connection of the switching tubes S1 and S2, and a second output end B1 is led out from the connection of the switching tubes S3 and S4; a bipolar low-voltage pulse power supply U1 for outputting a positive period;
similarly, the H-bridge inverter of the second inverter 5 is composed of four switching tubes S5, S6, S7, S8, wherein the switching tubes S5, S7 are connected to the positive power supply of the second inverter 5, and the switching tubes S6, S8 are connected to the negative power supply of the second inverter 5.
A first output end A2 of the second inverter 5 is led out from the connection of the switching tubes S5 and S6, and a second output end B2 is led out from the connection of the switching tubes S7 and S8; the bipolar low-voltage pulse power supply is used for outputting a negative period.
The first inverter device 3 and the second inverter device 5 are arranged in a cascade mode, and can periodically realize the following steps through controlling the closing or conducting state of the switch tube: when the single inverter outputs, the first inverter device 3 stores the follow current energy of the pulse transformer device into the second capacitor 4 to realize energy storage; after the energy storage of the second capacitor 4, the series superposition output of the first inverter 3 and the second inverter 5 is realized.
In the present embodiment, the pulse transformer device 8 includes a pulse transformer.
As shown in fig. 1, in the present embodiment, the control device includes: parameter acquisition module, low pressure DC power supply control module, pulse width modulation module and central processing module, wherein:
the parameter acquisition module is connected with the detection device 7 and used for receiving output parameters from the detection device 7; the low-voltage direct-current power supply control module is connected with the low-voltage direct-current power supply device and is used for adjusting the amplitude of the first low-voltage direct-current power supply by controlling the trigger angle of the controllable silicon;
the pulse width modulation module is connected with the first inverter device 3 and the second inverter device 5 and used for adjusting the amplitude of the bipolar low-voltage pulse power supply in a pulse width modulation mode;
and the central processing module is respectively connected with the parameter acquisition module, the low-voltage direct-current power supply control module and the pulse width modulation module and is used for controlling the amplitude of a first low-voltage direct-current power supply output by the low-voltage direct-current power supply device through the low-voltage direct-current power supply control module and controlling the low-voltage pulse power supply output by the first inverter device 3 and the second inverter device 5 in a cascading manner and the reverse-period energy storage time of the second capacitor 4 through the pulse width modulation module according to the output parameters.
In combination with the variable frequency pulse power supply with the double inverter of the embodiment, the invention also discloses a method for generating the variable frequency pulse power supply, which comprises the following steps:
a first period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in a bypass mode, and providing a positive-period low-voltage pulse power supply by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
second period: when the current of the low-voltage pulse power supply in the positive period reaches the upper limit value, the first inverter device is set to be in a bypass mode, all switching tubes of the second inverter device are turned off, and the follow current energy of the pulse transformer device charges the energy storage device through the protection diodes of the switching tubes;
in the third period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in a bypass mode, and providing a low-voltage pulse power supply with a negative period by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
the fourth period: when the current of the negative-period low-voltage pulse power supply reaches an upper limit value, the first inverter device is set to be in a bypass mode, all switching tubes of the second inverter device are turned off, and the follow current energy of the pulse transformer device charges the energy storage device through the protection diodes of the switching tubes;
a fifth period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in the chopping mode, and providing a positive-period low-voltage pulse power supply by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the first inverter device and the second inverter device are connected in series to output voltage together, and a positive-period low-voltage series-connection superposition pulse power supply is provided.
A sixth period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in the chopping mode, and providing a low-voltage pulse power supply with a negative period by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the first inverter device and the second inverter device are connected in series to output voltage together, and a low-voltage series-connection superposition pulse power supply with a negative period is provided.
The output waveform of the low-voltage pulse power supply is shown in fig. 3, wherein pulses of (phi), (phi) and (phi) correspond to pulses generated in a first period to a sixth period respectively.
The chopping mode is the monopulse output control of the inverter device, and a positive periodic path from the positive pole of the inverter device to the first output to the second output to the negative pole of the lower bridge arm to the inverter device is established, or a negative periodic path from the positive pole of the inverter device to the second output to the first output to the negative pole of the lower bridge arm to the inverter device is established.
The bypass mode is that two outputs of the inverter are in short circuit together through two lower bridge arms or two upper bridge arms of the inverter by conducting control over two upper bridge arms or two lower bridge arm switching tubes of the inverter.
The circuit diagram of fig. 2 is explained in detail as follows.
The two ends of the second capacitor 4 are not connected with external low-voltage alternating current, and the energy required by the energy storage of the second capacitor 4 is completely obtained by automatically switching into the resonance and rectification of the first inverter 3 and the pulse transformer device 8 at certain time to work to obtain voltage.
(1) A first period: the switching tubes S2 and S3 are turned on, the switching tubes S6 and S8 are turned on, the remaining switching tubes are turned off, that is, the first inverter 3 is set to the chopping mode, the second inverter 5 is set to the bypass mode, the load is completely operated by the positive voltage supplied from the first inverter 3 to supply the positive-period low-voltage pulse power supply, and at this time, the current flowing through the pulse transformer device 8 (the current of the positive-period low-voltage pulse power supply) is gradually increased.
(2) Second period: when the current of the positive-period low-voltage pulse power supply reaches the allowed maximum value, the first inverter device 3 is switched to be turned off at S1 and S3, S2 and S4 are turned on, and meanwhile, the second inverter device 5 turns off all the switching tubes, namely, the first inverter device 3 is set to be in a bypass mode, and the second inverter device 5 is in a turned-off state, so that the energy of follow current in the pulse transformer device 8 flows to the second capacitor 4 through the switching tubes S2 and S4, the protection diode of the switching tube S5 and the protection diode of the switching tube S8, and the second capacitor 4 stores energy. The capacitance value of the second capacitor 4 is controlled to match the reactance value of the pulse transformer device 8, so that the pulse transformer device operates in a resonance state, redundant follow current generated when the pulse transformer device 8 operates can be rapidly stored at two ends of the second capacitor 4, and the stored electric quantity is used for providing next pulse generation energy.
(3) In the third period: the switching tubes S1 and S4 are turned on, the switching tubes S6 and S8 are turned on, the remaining switching tubes are turned off, that is, the first inverter 3 is set to the chopping mode, the second inverter 5 is set to the bypass mode, the load is completely supplied with negative voltage by the first inverter 3 to operate, the low-voltage pulse power supply with the negative cycle is supplied, and at this time, the current flowing through the pulse transformer 8 (the current of the low-voltage pulse power supply with the negative cycle) is gradually increased.
(4) The fourth period: when the current of the negative-period low-voltage pulse power supply reaches the allowed maximum value, the first inverter device 3 is switched to be switched off by the switching tubes S2 and S4, the switching tubes S1 and S3 are switched on, and simultaneously the second inverter device 5 switches off all the switching tubes, namely, the first inverter device 3 is set to be in a bypass mode, and the second inverter device 5 is in a closed state, so that the energy of follow current in the pulse transformer device 8 flows to the second capacitor 4 through the protection diodes of the switching tubes S1, S3, S5 and S8, and the second capacitor 4 stores energy.
The capacitance value of the second capacitor 4 is controlled to match the reactance value of the pulse transformer device 8, so that the pulse transformer device operates in a resonance state, redundant follow current generated when the pulse transformer device 8 operates can be rapidly stored at two ends of the second capacitor 4, and the stored electric quantity is used for providing next pulse generation energy.
(5) A fifth period: the switching tubes S2 and S3 are turned on, the switching tubes S6 and S7 are turned on, the remaining switching tubes are turned off, that is, the first inverter device 3 is set to be in a chopping mode, the second inverter device 5 is set to be in the chopping mode, the load is connected in series by the first inverter device 3 and the second inverter device 5 to provide voltage for work together, and a positive-period low-voltage series-connection superposition pulse power supply is provided.
(6) A sixth period: the switching tubes S1 and S4 are turned on, the switching tubes S5 and S8 are turned on, the remaining switching tubes are turned off, that is, the first inverter device 3 is set to be in a chopping mode, the second inverter device 5 is set to be in the chopping mode, the load is connected in series by the first inverter device 3 and the second inverter device 5 to provide voltage for work together, and a low-voltage series-connection superposition pulse power supply with a negative period is provided.
The invention relates to a method for generating a variable-frequency pulse power supply, which adopts a main-auxiliary two-way inverter, wherein a first inverter is connected with low-voltage alternating current, a second inverter is connected with an energy storage capacitor, the first inverter provides a bipolar low-voltage pulse power supply in a positive period, and then the voltage of the pulse power supply is boosted by a pulse transformer to form a high-voltage direct current pulse power supply, and when the current of the low-voltage pulse power supply in the positive period reaches an upper limit value, the energy storage capacitor absorbs follow current energy of the pulse transformer device through the auxiliary inverter; the second inverter extracts the energy storage of the energy storage capacitor in the negative period and outputs the bipolar low-voltage pulse power supply. By the generation method, the follow current energy of the pulse transformer device can be recovered when the low-voltage pulse power supply outputs, and the power supply efficiency is improved.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A variable frequency pulsed power supply for electrical desalination, comprising:
the low-voltage direct-current power supply device comprises a rectifier and a filtering device and is used for rectifying and filtering low-voltage alternating current and outputting a first low-voltage direct-current power supply with an adjusted amplitude;
the energy storage device is used for reverse-period energy storage and outputting a second low-voltage direct-current power supply after the energy storage is finished;
the first inversion device is connected with the first low-voltage direct-current power supply device and is used for carrying out inversion processing on the first low-voltage direct-current power supply;
the second inversion device is connected with the energy storage device and used for providing a path for the energy storage device to store energy in an inverse period or performing inversion processing on the second low-voltage direct-current power supply; the low-voltage pulse power supply is cascaded with the first inversion device, and the output amplitude of the low-voltage pulse power supply is adjusted through duty ratio modulation, wherein the low-voltage pulse power supply is a bipolar low-voltage pulse power supply or a multi-polarity low-voltage pulse power supply;
the pulse transformer device is connected with the first inverter device and the second inverter device which are cascaded and used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the reactance value of the input end of the pulse transformer device is matched with the capacitance value of the energy storage device;
the detection device is used for monitoring the current and the voltage of the low-voltage pulse power supply and acquiring output parameters;
and the control device is respectively connected with the first low-voltage direct-current power supply device, the first inverter device, the second inverter device and the detection device, and is used for controlling the reverse-period energy storage time of the energy storage device and adjusting the amplitude of the low-voltage direct-current power supply and the amplitude and frequency of the low-voltage pulse power supply according to the output parameters.
2. The variable frequency pulsed power supply for electric desalination of claim 1, wherein the matching formula for matching the reactance value of the input of the pulse transformer means with the capacitance value of the energy storage means is: c ═ L ═ I)/(U2) Wherein: c is the capacitance value of the energy storage device, L is the reactance value of the primary side of the pulse transformer device, I is the instantaneous average value of the current flowing through the primary side of the pulse transformer device, and U is the voltage for charging the energy storage device.
3. The variable-frequency pulse power supply for electric desalting according to claim 1, wherein the first inverter and the second inverter each comprise a set of H-bridge inverter and an inverter driving circuit, the control device drives the H-bridge inverter through the inverter driving circuit, and a protection diode is connected in parallel to a switching tube of the H-bridge inverter.
4. The variable frequency pulsed power supply for electric desalination of claim 3, wherein the switching tubes of the H-bridge inverter are all MOS tubes or all IGBT transistors.
5. The variable frequency pulsed power supply for electric desalination of claim 1, wherein the energy storage means and filtering means are capacitor banks.
6. The variable frequency pulsed power supply for electrical desalination of claim 1, wherein the rectifier is a three-phase silicon controlled rectifier.
7. A variable frequency pulsed power supply for electric desalination according to any of claims 1-6 characterized in that the control means comprises:
the parameter acquisition module is connected with the detection device and used for receiving output parameters from the detection device;
the first low-voltage direct-current power supply control module is connected with the first low-voltage direct-current power supply device and used for adjusting the amplitude of the first low-voltage direct-current power supply;
the pulse width modulation module is connected with the first inverter device and the second inverter device and used for adjusting the amplitude of the bipolar low-voltage pulse power supply in a pulse width modulation mode;
and the central processing module is respectively connected with the parameter acquisition module, the low-voltage direct-current power supply control module and the pulse width modulation module and is used for controlling the amplitude of a first low-voltage direct-current power supply output by the low-voltage direct-current power supply device through the low-voltage direct-current power supply control module, controlling the low-voltage pulse power supply output by the first inverter device and the second inverter device in a cascading manner through the pulse width modulation module and controlling the reverse-period energy storage time of the energy storage device according to the output parameters.
8. A method for generating a variable frequency pulsed power supply, characterized in that the variable frequency pulsed power supply for electric desalination of claim 8 is applied, comprising:
a first period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in a bypass mode, and providing a positive-period low-voltage pulse power supply by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
second period: when the current of the low-voltage pulse power supply in the positive period reaches an upper limit value, the first inverter device is set to be in a bypass mode, all switching tubes of the second inverter device are turned off, and the follow current energy of the pulse transformer device charges the energy storage device through the protection diodes of the switching tubes;
in the third period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in a bypass mode, and providing a low-voltage pulse power supply with a negative period by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
the fourth period: when the current of the negative-period low-voltage pulse power supply reaches an upper limit value, the first inverter device is set to be in a bypass mode, all switching tubes of the second inverter device are turned off, and the follow current energy of the pulse transformer device charges the energy storage device through the protection diodes of the switching tubes;
a fifth period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in the chopping mode, and providing a positive-period low-voltage pulse power supply by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the first inverter device and the second inverter device are connected in series to output voltage together, and a positive-period low-voltage series-connection superposition pulse power supply is provided;
a sixth period: setting the first inverter device to be in a chopping mode, setting the second inverter device to be in the chopping mode, and providing a low-voltage pulse power supply with a negative period by the first inverter device; the pulse transformer device is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply; the first inverter device and the second inverter device are connected in series to output voltage together, and a low-voltage series-connection superposition pulse power supply with a negative period is provided;
the chopping mode is single-pulse output control of the inverter device, and a positive periodic path from the positive pole of the inverter device to the first output to the second output to the lower bridge arm to the negative pole of the inverter device is established, or a negative periodic path from the positive pole of the inverter device to the second output to the first output to the lower bridge arm to the negative pole of the inverter device is established;
the bypass mode is that two outputs of the inverter are in short circuit together through two lower bridge arms or two upper bridge arms of the inverter by conducting control over two upper bridge arms or two lower bridge arm switching tubes of the inverter.
CN202010499225.1A 2020-06-04 2020-06-04 Variable-frequency pulse power supply for electric desalting and generation method thereof Pending CN113783460A (en)

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CN202010499225.1A CN113783460A (en) 2020-06-04 2020-06-04 Variable-frequency pulse power supply for electric desalting and generation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117655440A (en) * 2023-09-22 2024-03-08 新疆大学 Bipolar high-low voltage composite pulse power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117655440A (en) * 2023-09-22 2024-03-08 新疆大学 Bipolar high-low voltage composite pulse power supply
CN117655440B (en) * 2023-09-22 2024-09-20 新疆大学 Bipolar high-low voltage composite pulse power supply

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