CN113179028A - Alternating current pulse crude oil dehydration power supply device with pulse width internal segment pressurization function - Google Patents
Alternating current pulse crude oil dehydration power supply device with pulse width internal segment pressurization function Download PDFInfo
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- CN113179028A CN113179028A CN202110592805.XA CN202110592805A CN113179028A CN 113179028 A CN113179028 A CN 113179028A CN 202110592805 A CN202110592805 A CN 202110592805A CN 113179028 A CN113179028 A CN 113179028A
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- 239000010779 crude oil Substances 0.000 title claims abstract description 40
- 230000018044 dehydration Effects 0.000 title claims abstract description 30
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 43
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 230000033228 biological regulation Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims abstract description 5
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 28
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 17
- 210000004899 c-terminal region Anatomy 0.000 claims description 6
- 230000001419 dependent effect Effects 0.000 claims description 5
- 230000011218 segmentation Effects 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 208000005156 Dehydration Diseases 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 208000037516 chromosome inversion disease Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators with digital control
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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
- 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
- H02M7/21—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 triode or transistor type requiring continuous application of a control signal
- H02M7/217—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- 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
- H02M7/53871—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 with automatic control of output voltage or current
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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
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an alternating current pulse crude oil dehydration power supply device with a pulse width internal segmented pressurization function, which comprises a rectification filter circuit, a DC/DC voltage regulation circuit, a segmented pressurization circuit, a full-bridge inverter circuit, a step-up transformer and a digital control circuit taking a microprocessor as a core, wherein the rectification filter circuit is used for carrying out rectification filtering processing on input single-phase or three-phase alternating current; the DC/DC voltage regulating circuit is used for carrying out voltage reduction treatment on the stable direct current voltage; the segmented pressurizing circuit is used for conducting the switching tube in a segmented mode according to a preset pulse width signal and inhibiting a current peak at the phase change moment; the full-bridge inverter circuit is used for inverting the buffered direct-current voltage and obtaining alternating-current voltage on the primary side of the booster transformer; the step-up transformer is used for boosting the alternating voltage and connecting the boosted voltage to the electrode of the crude oil electric dehydrator. The device overcomes the problems of large current peak and serious electromagnetic interference of the power switch tube, and ensures that the power supply has higher operation stability.
Description
Technical Field
The invention relates to the technical field of crude oil dehydration power supplies, in particular to an alternating current pulse crude oil dehydration power supply device with a pulse width internal segmentation pressurization function.
Background
Crude oil is formed by compressing and depositing various organic matters in a bottom rock layer for millions of years, the produced liquid of the crude oil is extremely complex in composition, contains more salts and moisture, and can bring much harm if the oil-containing water is too high, such as invisibly occupying the resource space of pipelines and other accessory equipment in the crude oil transportation and storage process, seriously corroding long-distance delivery pipelines and precision equipment, polluting the environment, poisoning catalysts, increasing energy consumption, reducing product quality and the like. Therefore, in the purification and processing processes of crude oil, the adoption of an efficient dehydration technology is of great importance for the dehydration treatment of crude oil, and at present, the electric dehydration technology is still adopted in most of China to be matched with a chemical demulsification method for the dehydration treatment of crude oil.
The electric dehydration technology is to use the principle that the dispersed phase water particles in crude oil emulsion can generate polarization under the action of a high-voltage electric field to carry out electric demulsification, thereby achieving the dehydration effect. In order to obtain a good dehydration effect in an actual crude oil dehydration process, parameters such as frequency, voltage and duty ratio of a rectangular wave of a crude oil dehydration power supply are generally required to be adjusted according to parameters such as water content, surface tension, density, pressure and temperature of crude oil according to a certain mathematical relation model, and the power supply is controlled to operate under the parameters; the other is a crude oil dehydration power supply adopting a secondary inversion structure, but the power supply still has the defects of difficult accurate frequency adjustment, poor voltage waveform stability, limited output power and the like.
Disclosure of Invention
The invention aims to provide an alternating-current pulse crude oil dehydration power supply device with a pulse width internal segmented pressurization function, which overcomes the problems of large current peak and serious electromagnetic interference of a power switch tube, and ensures that the power supply has higher operation stability, better reliability and more excellent performance.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an exchange pulse crude oil dehydration power supply unit with segmentation pressurization function in pulse width, the device includes rectifier filter circuit, DC/DC regulator circuit, segmentation pressurization circuit, full-bridge inverter circuit, step-up transformer, uses microprocessor as the digital control circuit of core, wherein:
the rectification filter circuit is composed of a rectifier diode D1、D2、D3、D4、D5、D6Voltage dependent resistor RV1、RV2、RV3、RV4And a filter capacitor C1Composition for single-phase or three-phase ac to be inputPerforming rectification filtering treatment to obtain stable direct current voltage;
the DC/DC voltage regulating circuit is composed of a power switch tube T1Capacitor C2Diode D7、D8Inductance L0、L1Resistance R1The first PWM closed-loop control circuit is connected with the rectifying and filtering circuit and is used for carrying out voltage reduction processing on the stable direct-current voltage obtained by the rectifying and filtering circuit to obtain controllable direct-current voltage;
the segmented voltage-adding routing resistor R2、R3Capacitor C3、C4Power switch tube T2、T3Diode D9、D10The first voltage sensor, the second driving circuit and the second PWM control circuit are connected with the DC/DC voltage regulating circuit and used for conducting the switching tube in a segmented mode according to a preset pulse width signal and inhibiting a current peak at the phase change moment so as to reduce the impact of the current peak on the switching tube and buffer the direct current voltage obtained by the DC/DC voltage regulating circuit;
the full-bridge inverter circuit is composed of a power switch tube T4、T5、T6、T7Inductance L2、L3The third PWM control circuit and the third driving circuit are connected with the segmented pressurizing circuit and used for carrying out inversion processing on the direct-current voltage buffered by the segmented pressurizing circuit through modulating frequency and duty ratio to obtain alternating-current voltage with the amplitude, the frequency and the duty ratio which can be regulated as required on the primary side of the boosting transformer;
the boosting transformer is connected with the full-bridge inverter circuit and used for boosting the alternating-current voltage obtained at the primary side to obtain a high-voltage variable-frequency rectangular-wave alternating-current voltage with controllable voltage, frequency and pulse width, and the output end of the boosting transformer is connected to an electrode of the crude oil electric dehydrator and provides electric energy for crude oil emulsion;
the digital control circuit taking the microprocessor as a core is used for generating a digital PWM control signal according to a control requirement and controlling the DC/DC voltage regulating circuit, the segmented pressurizing circuit and the full-bridge inverter circuit.
According to the technical scheme provided by the invention, the device overcomes the problems of large current peak and serious electromagnetic interference of the power switch tube, so that the power supply has higher operation stability, better reliability and more excellent performance, and the service life of the power supply device is effectively prolonged under the same operation environment state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an AC pulse crude oil dehydration power supply device with a pulse width internal segmented pressurization function according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of the PWM and transformer output process of the segmented voltage-boosting circuit and the full-bridge inverter circuit according to the embodiment of the present invention;
FIG. 3 is another waveform diagram of the PWM and transformer output process of the segmented voltage boosting circuit and the full-bridge inverter circuit according to the embodiment of the present invention;
FIG. 4 shows the direct lag method of generating f according to an embodiment of the present inventionminSchematic diagram of 40kHz two-terminal PWM process.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The following embodiments of the present invention will be further described in detail with reference to the accompanying drawings, and as shown in fig. 1, is a schematic structural diagram of an ac pulse crude oil dehydration power supply apparatus with a pulse width internal segmented pressurization function provided by the embodiments of the present invention, the apparatus mainly includes a rectification filter circuit, a DC/DC voltage regulation circuit, a segmented pressurization circuit, a full bridge inverter circuit, a step-up transformer, and a digital control circuit with a microprocessor as a core, wherein:
the rectification filter circuit is composed of a rectifier diode D1、D2、D3、D4、D5、D6Voltage dependent resistor RV1、RV2、RV3、RV4And a filter capacitor C1The device comprises a rectifier, a filter, a rectifier and a rectifier, wherein the rectifier is used for rectifying and filtering input single-phase or three-phase alternating current to obtain stable direct current voltage;
the DC/DC voltage regulating circuit is composed of a power switch tube T1Capacitor C2Diode D7、D8Inductance L0、L1Resistance R1The first PWM closed-loop control circuit is connected with the rectifying and filtering circuit and is used for carrying out voltage reduction processing on the stable direct-current voltage obtained by the rectifying and filtering circuit to obtain controllable direct-current voltage;
the segmented voltage-adding routing resistor R2、R3Capacitor C3、C4Power switch tube T2、T3Diode D9、D10The first voltage sensor, the second driving circuit and the second PWM control circuit are connected with the DC/DC voltage regulating circuit and used for conducting the switching tube in a segmented mode according to a preset pulse width signal and inhibiting a current peak at the phase change moment so as to reduce the impact of the current peak on the switching tube and buffer the direct current voltage obtained by the DC/DC voltage regulating circuit;
the full-bridge inverter circuit is composed of a power switch tube T4、T5、T6、T7Inductance L2、L3And a third PWM control circuit and a third drive circuit connected with the segmented voltage-increasing circuit for inverting the DC voltage buffered by the segmented voltage-increasing circuit by modulating the frequency and duty ratio to obtain amplitude at the primary side of the step-up transformerThe value, the frequency and the duty ratio of the alternating voltage can be adjusted as required;
the boosting transformer is connected with the full-bridge inverter circuit and used for boosting the alternating-current voltage obtained at the primary side to obtain a high-voltage variable-frequency rectangular-wave alternating-current voltage with controllable voltage, frequency and pulse width, and the output end of the boosting transformer is connected to an electrode of the crude oil electric dehydrator and provides electric energy for crude oil emulsion;
the digital control circuit taking the microprocessor as a core is used for generating a digital PWM control signal according to a control requirement and controlling the DC/DC voltage regulating circuit, the segmented pressurizing circuit and the full-bridge inverter circuit.
In a specific implementation, as shown in fig. 1, the connection relationship between each component in the rectifying and filtering circuit is as follows:
u-end rectifier diode D for input single-phase or three-phase alternating current1Anode and rectifier diode D4Cathode of (D), V-terminal rectifier diode2Anode and rectifier diode D5Cathode of (D), W is connected with a rectifier diode3Anode and rectifier diode D6A cathode of (a);
a piezoresistor RV is connected between the U end and the V end of the single-phase or three-phase alternating current1A voltage dependent resistor RV is connected between the V end and the W end2A piezoresistor RV is connected between the U end and the W end3；
Rectifier diode D1、D2、D3Cathode and rectifier diode D4、D5、D6Between the anodes is connected with a piezoresistor RV in parallel4And a filter capacitor C1。
The connection relation of each component in the DC/DC voltage regulating circuit is as follows:
the output 1 end of the rectification filter circuit is connected with the inductor L of the DC/DC voltage regulating circuit in series0And power switch tube T1；
Power switch tube T1Emitter E end series diode D7Diode D8And an inductance L1；
Inductor L1Connected to the output 2 terminal of the rectification filter circuitAnd a resistance R1Is connected in parallel to the inductor L1Two ends;
in the diode D7Anode or diode D8A capacitor C is connected in parallel between the cathode of the rectifier filter circuit and the output 1 end of the rectifier filter circuit2；
The first PWM closed-loop control circuit is connected with the power switch tube T through the first drive circuit1The G ends of the gates are connected.
The connection relationship of each part in the segmented pressurization circuit is as follows:
power switch tube T in the segmented voltage-increasing circuit2The collector C end of the DC/DC voltage regulating circuit is connected with the output 1 end of the DC/DC voltage regulating circuit; power switch tube T3Collector terminal C via capacitor C3A power switch tube T connected to the output 1 end of the DC/DC voltage regulating circuit3The collector C terminal of the capacitor C4The output 2 end is connected with the DC/DC voltage regulating circuit;
power switch tube T2Emitter E end series diode D9Power switch tube T3Emitter E end series diode D10(ii) a And a diode D9And diode D10A common negative connection;
resistance R2And R3Are respectively connected in parallel with the capacitor C3And C4And a first voltage sensor is arranged between the output 1 end and the output 2 end of the DC/DC voltage regulating circuit;
the resistance R collected by the first voltage sensor2、R3Voltage at both ends and voltage signal VfThe first PWM closed-loop control circuit feeds back the DC/DC voltage regulating circuit; wherein the voltage signal VfThe output voltage of the DC/DC voltage regulating circuit or the input voltage of the segmented voltage-increasing circuit is included;
the first PWM closed-loop control circuit receives a voltage signal VfWith a set voltage signal VgAfter the difference value comparison is carried out, the closed-loop control outputs a first PWM pulse, and the first PWM pulse acts on a power switch tube T of the DC/DC voltage regulating circuit after passing through a first driving circuit of the DC/DC voltage regulating circuit1A gate terminal G;
the second PWM control circuit is respectively connected with the power switch tube T through the second drive circuit2Power switch tube T3The G ends of the gates are connected.
The connection relation of all parts in the full-bridge inverter circuit is as follows:
the output anode of the segmented voltage-increasing circuit, i.e. diode D9、D10Cathode of the full-bridge inverter circuit and a power switch tube T in the full-bridge inverter circuit4、T6The collector C end is connected;
the negative output of the segmented voltage-increasing circuit, i.e. the resistance R3End 2 and power switch tube T in full-bridge inverter circuit5、T7The end E of the emitter is connected;
power switch tube T4Emitter E end and power switch tube T5Collector C terminal of the capacitor via an inductor L3And a step-up transformer B1The B end of the primary side is connected with a power switch tube T6Emitter E end and power switch tube T7Collector C terminal of the capacitor via an inductor L2And the step-up transformer B1The A end of the primary side is connected;
the step-up transformer B1The end C and the end D of the output side are connected to the electrodes of the crude oil electric dehydrator;
the third PWM control circuit is respectively connected with the power switch tube T through the third drive circuit4Power switch tube T5Power switch tube T6Power switch tube T7The G ends of the gates are connected.
In addition, in the concrete implementation, the digital control circuit taking the microprocessor as the core switches on the power switch tube of the segmented pressurizing circuit in a segmented manner through the generated double-end PWM signal with adjustable pulse width, and when the double-end PWM signal controls the power switch tube to be switched on and off to realize the segmented pressurizing function, the segmented pressurizing circuit and the full-bridge inverter circuit are matched with each other according to a certain time sequence to work, and the concrete process is as follows:
two groups of bridge arms in the full-bridge inverter circuit are alternately conducted, namely when one group of bridge arms is conducted, the other group of bridge arms is in a turn-off state, and when any one group of bridge arms in the full-bridge inverter circuit receives signalsWhen the drive signal is conducted to work, the power switch tube T of the segmented pressurization circuit3And is also conducted therewith, and in the working process of the full-bridge inverter circuit, the power switch tube T3Fig. 2 is a waveform diagram of the output process of the segmented voltage-boosting circuit, the full-bridge inverter circuit, and the PWM and transformer according to the embodiment of the present invention. Or the full-bridge inverter circuit is turned off when the low-voltage phase change process is finished, as shown in fig. 3, another waveform diagram is shown, and at this time, relatively low voltage is applied to the primary side of the step-up transformer;
when the low-voltage phase conversion process of the full-bridge inverter circuit is finished, the second drive circuit of the segmented pressurization circuit drives the power switch tube T2When the booster transformer is switched on, the full amplitude value of the primary side of the booster transformer is added with the preceding voltage, and the power switch tube T is switched on in a time period after one set of bridge arms is switched off (including the switching-off moment) and before the other set of bridge arms is switched on2Can be cut off at any time;
along with the alternate conduction of the two bridge arms of the full-bridge inverter circuit, the two power switch tubes T in the segmented pressurizing circuit2、T3Repeating the above steps to realize the step-by-step increase of the high voltage amplitude of the pole plate, and two power switch tubes T in the segment pressurizing circuit2、T3Is regulated by the second PWM control circuit.
In addition, the value of the comparison register can be set, and the pulse width of the double-end PWM signal in one period can be set.
The method for generating the pulse width adjustable double-end PWM signal by the digital control circuit with the microprocessor as the core is a direct hysteresis method, and particularly, two timer resources of the microprocessor are used, so that the two timers are started simultaneously, the initial value of the second timer is half a period greater than the initial value of the first timer, the rest parameters are completely the same, and double-end PWM with the phase difference of 180 degrees can be generated by the direct hysteresis method.
For the timer resource of the microprocessor with the PWM special function output port, a comparison register and a period register are generally provided, and the comparison register and the period register have an automatic loading function.
For example, as shown in FIG. 4, f is generated by the direct lag method according to the embodiment of the present inventionminA schematic diagram of a 40kHz double-ended PWM process, where the period of the double-ended PWM signal shown in FIG. 4 is T, and the positive bandwidth of each PWM signal is TONThe counting input frequency of the microprocessor timer resource is fcpu. The value TxPR of the period register is calculated as TxPR ═ txfcpu-1, the calculation formula for comparing the register value is txcprm ═ TxPR-TON×fcpuThe initial value of the timer for generating the first PWM signal is 0, and the initial value of the timer for generating the second PWM signal is TxIni ═ T × fcpu/2-1. The specific generation process of the two-terminal PWM is shown in fig. 2, and only the value of the comparison register needs to be changed to modulate the pulse width of the two-terminal PWM signal.
The lowest frequency f of the two-terminal PWM signal generated by the direct lag methodmin＝fcpua/TxPRMax, where TxPRMax is the maximum count value of the microprocessor timer register. Therefore, in the embodiment of the invention, when the third PWM control circuit controls the full-bridge inverter circuit, the frequency of the generated double-ended PWM signal is fminThe direct hysteresis method is adopted when the frequency is between 40 kHz; if the frequency of the generated double-end PWM signal is between 0 and fminIn the middle (low-frequency double-end PWM signal), the register counting period and the comparison matching times are counted, and then corresponding operation is performed.
In addition, the digital control circuit taking the microprocessor as a core can control the DC/DC voltage regulating circuit to rapidly adjust the output voltage according to the requirement, and control the output voltage to change according to the set frequency period in a waveform (such as a sine form, an exponential form and the like) of a specific form according to the requirement; the closed loop feedback control adopts a constant frequency modulation pulse width mode, and the control algorithm adopts a digital incremental PID algorithm.
Based on the power supply device with the structure, the output voltage range of the DC/DC voltage regulating circuit is 0.5-500V; the voltage regulation range of the high-voltage variable-frequency rectangular wave alternating voltage obtained after the voltage is boosted by the booster transformer is between 100V and 40kV, the frequency regulation range is between 0Hz and 40kHz, and the pulse width regulation range is between 0% and 49%.
It is noted that those skilled in the art will recognize that embodiments of the present invention are not described in detail herein.
In summary, the apparatus according to the embodiment of the present invention has the following advantages:
(1) compared with the traditional secondary inversion type high-voltage variable-frequency rectangular wave alternating-current crude oil dehydration power supply, the primary voltage regulation part adopts a non-isolated voltage regulation mode, so that the efficiency is higher;
(2) the DC/DC voltage regulating loop adopts a novel voltage reduction topological structure, the circuit connection is simple, the maintenance is convenient, the control is easy, the power supply conversion efficiency is high, and the service life of the power supply is longer under the same operation environment state;
(3) the segmented pressurizing circuit conducts the switch tube in a segmented mode according to the preset pulse width signal, the high voltage of the polar plate is increased to amplitude voltage in a phase change instant in a segmented mode, meanwhile, the current peak in the phase change instant full-bridge inverter circuit is restrained, the impact of the current peak on the switch tube is reduced, the service life of the switch tube is prolonged to a certain extent, the switching loss is reduced, the safety and reliability of the circuit are improved, and the crude oil dehydration efficiency is further improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides an exchange pulse crude oil dehydration power supply unit with segmentation pressurization function in pulse width, its characterized in that, the device includes rectifier filter circuit, DC/DC regulator circuit, segmentation pressurization circuit, full-bridge inverter circuit, step-up transformer, uses microprocessor as the digital control circuit of core, wherein:
the rectification filter circuit is composed of a rectifier diode D1、D2、D3、D4、D5、D6Voltage dependent resistor RV1、RV2、RV3、RV4And a filter capacitor C1The device comprises a rectifier, a filter, a rectifier and a rectifier, wherein the rectifier is used for rectifying and filtering input single-phase or three-phase alternating current to obtain stable direct current voltage;
the DC/DC voltage regulating circuit is composed of a power switch tube T1Capacitor C2Diode D7、D8Inductance L0、L1Resistance R1The first PWM closed-loop control circuit is connected with the rectifying and filtering circuit and is used for carrying out voltage reduction processing on the stable direct-current voltage obtained by the rectifying and filtering circuit to obtain controllable direct-current voltage;
the segmented voltage-adding routing resistor R2、R3Capacitor C3、C4Power switch tube T2、T3Diode D9、D10The first voltage sensor, the second driving circuit and the second PWM control circuit are connected with the DC/DC voltage regulating circuit and used for conducting the switching tube in a segmented mode according to a preset pulse width signal and inhibiting a current peak at the phase change moment so as to reduce the impact of the current peak on the switching tube and buffer the direct current voltage obtained by the DC/DC voltage regulating circuit;
the full-bridge inverter circuit is composed of a power switch tube T4、T5、T6、T7Inductance L2、L3The third PWM control circuit and the third driving circuit are connected with the segmented pressurizing circuit and used for carrying out inversion processing on the direct-current voltage buffered by the segmented pressurizing circuit through modulating frequency and duty ratio to obtain alternating-current voltage with the amplitude, the frequency and the duty ratio which can be regulated as required on the primary side of the boosting transformer;
the boosting transformer is connected with the full-bridge inverter circuit and used for boosting the alternating-current voltage obtained at the primary side to obtain a high-voltage variable-frequency rectangular-wave alternating-current voltage with controllable voltage, frequency and pulse width, and the output end of the boosting transformer is connected to an electrode of the crude oil electric dehydrator and provides electric energy for crude oil emulsion;
the digital control circuit taking the microprocessor as a core is used for generating a digital PWM control signal according to a control requirement and controlling the DC/DC voltage regulating circuit, the segmented pressurizing circuit and the full-bridge inverter circuit.
2. The ac pulse crude oil dehydration power supply unit with pulse width internal segment pressurization function according to claim 1 is characterized in that the connection relationship of each component in said rectification filter circuit is as follows:
u-end rectifier diode D for input single-phase or three-phase alternating current1Anode and rectifier diode D4Cathode of (D), V-terminal rectifier diode2Anode and rectifier diode D5Cathode of (D), W is connected with a rectifier diode3Anode and rectifier diode D6A cathode of (a);
a piezoresistor RV is connected between the U end and the V end of the single-phase or three-phase alternating current1A voltage dependent resistor RV is connected between the V end and the W end2A piezoresistor RV is connected between the U end and the W end3；
Rectifier diode D1、D2、D3Cathode and rectifier diode D4、D5、D6Between the anodes is connected with a piezoresistor RV in parallel4And a filter capacitor C1。
3. The ac pulse crude oil dehydration power supply device with pulse width internal segment pressurization function according to claim 1, characterized in that the connection relationship of each component in the DC/DC voltage regulation circuit is as follows:
the output 1 end of the rectification filter circuit is connected with the inductor L of the DC/DC voltage regulating circuit in series0And power switch tube T1；
Power switch tube T1Emitter E end series diode D7Diode D8And an inductance L1；
Inductor L1A resistor R connected to the output 2 terminal of the rectifying and filtering circuit1Is connected in parallel to the inductor L1Two ends;
in the diode D7And the rectifying and filtering circuitA capacitor C is connected in parallel between the output 1 ends of the circuits2；
The first PWM closed-loop control circuit is connected with the power switch tube T through the first drive circuit1The G ends of the gates are connected.
4. The ac pulse crude oil dehydration power supply device with pulse width internal segmented pressurization function according to claim 1 is characterized in that the connection relationship of each component in the segmented pressurization circuit is as follows:
power switch tube T in the segmented voltage-increasing circuit2The collector C end of the DC/DC voltage regulating circuit is connected with the output 1 end of the DC/DC voltage regulating circuit; power switch tube T3Collector terminal C via capacitor C3A power switch tube T connected to the output 1 end of the DC/DC voltage regulating circuit3The collector C terminal of the capacitor C4The output 2 end is connected with the DC/DC voltage regulating circuit;
power switch tube T2Emitter E end series diode D9Power switch tube T3Emitter E end series diode D10(ii) a And a diode D9And diode D10A common negative connection;
resistance R2And R3Are respectively connected in parallel with the capacitor C3And C4And a first voltage sensor is arranged between the output 1 end and the output 2 end of the DC/DC voltage regulating circuit;
the resistance R collected by the first voltage sensor2、R3Voltage at both ends and voltage signal VfThe first PWM closed-loop control circuit feeds back the DC/DC voltage regulating circuit; wherein the voltage signal VfThe output voltage of the DC/DC voltage regulating circuit or the input voltage of the segmented voltage-increasing circuit is included;
the first PWM closed-loop control circuit receives a voltage signal VfWith a set voltage signal VgAfter the difference value comparison is carried out, the closed-loop control outputs a first PWM pulse, and the first PWM pulse acts on a power switch tube T of the DC/DC voltage regulating circuit after passing through a first driving circuit of the DC/DC voltage regulating circuit1A gate terminal G;
second oneThe PWM control circuit is respectively connected with the power switch tube T through the second drive circuit2Power switch tube T3The G ends of the gates are connected.
5. The ac pulse crude oil dehydration power supply unit with pulse width internal segment pressurization function according to claim 1 is characterized in that the connection relationship of each component in the full bridge inverter circuit is as follows:
the output anode of the segmented voltage-increasing circuit, i.e. diode D9、D10Cathode of the full-bridge inverter circuit and a power switch tube T in the full-bridge inverter circuit4、T6The collector C end is connected;
the negative output of the segmented voltage-increasing circuit, i.e. the resistance R3End 2 and power switch tube T in full-bridge inverter circuit5、T7The end E of the emitter is connected;
power switch tube T4Emitter E end and power switch tube T5Collector C terminal of the capacitor via an inductor L3And a step-up transformer B1The B end of the primary side is connected with a power switch tube T6Emitter E end and power switch tube T7Collector C terminal of the capacitor via an inductor L2And the step-up transformer B1The A end of the primary side is connected;
the step-up transformer B1The end C and the end D of the output side are connected to the electrodes of the crude oil electric dehydrator;
the third PWM control circuit is respectively connected with the power switch tube T through the third drive circuit4Power switch tube T5Power switch tube T6Power switch tube T7The G ends of the gates are connected.
6. The ac pulse crude oil dehydration power supply unit with pulse width internal segment pressurization function according to claim 1, characterized in that said microprocessor-based digital control circuit conducts the power switch tube of said segment pressurization circuit by segment through the generated pulse width adjustable double-end PWM signal, when said double-end PWM signal controls the on-off of the power switch tube to realize the segment pressurization function, said segment pressurization circuit and full bridge inverter circuit cooperate with each other according to a certain time sequence, the concrete process is:
two groups of bridge arms in the full-bridge inverter circuit are alternately conducted, namely when one group of bridge arms is conducted, the other group of bridge arms is in a turn-off state, and when any one group of bridge arms in the full-bridge inverter circuit receives a driving signal to conduct and work, the power switch tube T of the segmented pressurizing circuit3And is also conducted therewith, and in the working process of the full-bridge inverter circuit, the power switch tube T3The inverter is always in a conducting state or is turned off when the low-voltage phase change process of the full-bridge inverter circuit is finished, and relatively low voltage is applied to the primary side of the booster transformer;
when the low-voltage phase conversion process of the full-bridge inverter circuit is finished, the second drive circuit of the segmented pressurization circuit drives the power switch tube T2And when the booster transformer is switched on, the full amplitude value of the primary side of the booster transformer is added with the preceding voltage, and the power switch tube T is switched on in the time period after one group of bridge arms is switched off and before the other group of bridge arms is switched on2Can be cut off at any time;
along with the alternate conduction of the two bridge arms of the full-bridge inverter circuit, the two power switch tubes T in the segmented pressurizing circuit2、T3Repeating the above steps to realize the step-by-step increase of the high voltage amplitude of the pole plate, and two power switch tubes T in the segment pressurizing circuit2、T3Is regulated by the second PWM control circuit.
7. The AC pulse crude oil dehydration power supply unit with pulse width internal segment pressurization function according to claim 1,
the method for generating the pulse width adjustable double-end PWM signal by the digital control circuit with the microprocessor as the core is a direct hysteresis method, and particularly, two timer resources of the microprocessor are used, so that the two timers are started simultaneously, the initial value of the second timer is half a period greater than the initial value of the first timer, the rest parameters are completely the same, and double-end PWM with the phase difference of 180 degrees can be generated by the direct hysteresis method.
8. The AC pulse crude oil dehydration power supply unit with pulse width internal segment pressurization function according to claim 1,
the digital control circuit taking the microprocessor as a core can control the DC/DC voltage regulating circuit to rapidly adjust the output voltage according to the requirement and control the output voltage to change according to the set frequency period in a waveform of a specific form according to the requirement; the closed loop feedback control adopts a constant frequency modulation pulse width mode, and the control algorithm adopts a digital incremental PID algorithm.
9. The AC pulse crude oil dehydration power supply unit with pulse width internal segment pressurization function according to claim 1,
the output voltage range of the DC/DC voltage regulating circuit is 0.5-500V;
the voltage regulation range of the high-voltage variable-frequency rectangular wave alternating voltage obtained after the voltage is boosted by the booster transformer is between 100V and 40kV, the frequency regulation range is between 0Hz and 40kHz, and the pulse width regulation range is between 0% and 49%.
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