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CN113179028B - AC pulse crude oil dehydration power supply device with pulse width and internal-division pressurizing function - Google Patents

AC pulse crude oil dehydration power supply device with pulse width and internal-division pressurizing function Download PDF

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Publication number
CN113179028B
CN113179028B CN202110592805.XA CN202110592805A CN113179028B CN 113179028 B CN113179028 B CN 113179028B CN 202110592805 A CN202110592805 A CN 202110592805A CN 113179028 B CN113179028 B CN 113179028B
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China
Prior art keywords
circuit
voltage
switch tube
power switch
pressurizing
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CN113179028A (en
Inventor
黄松涛
贺雪
李伟
焦向东
陈家庆
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Beijing Jiuyi Technology Co ltd
Beijing Institute of Petrochemical Technology
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Beijing Jiuyi Technology Co ltd
Beijing Institute of Petrochemical Technology
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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-division pressurizing function, which comprises a rectification filter circuit, a DC/DC voltage regulating circuit, a sectional pressurizing 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 rectifying and filtering 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 sectional pressurizing circuit is used for sectionally conducting the switching tube according to a preset pulse width signal and inhibiting a current peak at the moment of commutation; the full-bridge inverter circuit is used for performing inversion treatment on the buffered direct-current voltage and obtaining alternating-current voltage at the primary side of the step-up 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 solves 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

AC pulse crude oil dehydration power supply device with pulse width and internal-division pressurizing function
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 dividing and pressurizing function.
Background
Crude oil is formed by compressing and depositing various organic matters on a ground bed rock layer for several hundred years, the produced liquid of the crude oil has extremely complex components, contains more salts and water, and can bring various damages if the oil content is too high, such as occupying the resource space of pipelines and other accessory equipment in the process of transporting and storing the crude oil in an intangible way, severely corroding remote conveying pipelines and precise equipment, polluting the environment, poisoning a catalyst, increasing energy consumption, reducing the product quality and the like. Therefore, in the purification and processing process of crude oil, it is crucial to dehydrate crude oil by adopting an efficient dehydration technology, and most of China still adopts an electric dehydration technology to dehydrate crude oil by matching with a chemical demulsification method.
The electric dehydration technology is to use the principle that dispersed phase water particles in crude oil emulsion can generate polarization phenomenon under the action of high voltage electric field to carry out electric demulsification, thereby achieving the dehydration effect. In order to obtain better dehydration effect in the actual crude oil dehydration process, the parameters such as the frequency, the voltage, the duty ratio and the like of a rectangular wave of a crude oil dehydration power supply are usually required to be adjusted according to a certain mathematical relation model according to the parameters such as the water content, the surface tension, the density, the pressure, the temperature and the like of crude oil, the power supply is controlled to run under the parameters, the use of a high-frequency alternating current pulse power supply of an electric dehydrator mainly has two forms, one of the three forms is a crude oil dehydration power supply adopting a once inversion structure, but the crude oil dehydration power supply has the defects of low efficiency, large volume, large output voltage adjustment step length, difficult adjustment, poor pulse stability, difficult adjustment and the like; the other is a crude oil dehydration power supply adopting a secondary inversion structure, but the power supply still has the defects of difficult frequency accurate 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 and sectional pressurizing function, which solves the problems of large current peak and serious electromagnetic interference of a power switch tube, so that the power supply has higher running stability, better reliability and better performance.
The invention aims at realizing the following technical scheme:
An alternating current pulse crude oil dehydration power supply device with pulse width and sectional pressurizing functions comprises a rectification filter circuit, a DC/DC voltage regulating circuit, a sectional pressurizing 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 consists of a rectification diode D 1、D2、D3、D4、D5、D6, a piezoresistor RV 1、RV2、RV3、RV4 and a filter capacitor C 1, and 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 consists of a power switch tube T 1, a capacitor C 2, a diode D 7、D8, an inductor L 0、L1, a resistor R 1, a first PWM closed-loop control circuit and a first driving circuit, and is connected with the rectifying and filtering circuit and used for carrying out voltage reduction treatment on the stable direct-current voltage obtained by the rectifying and filtering circuit to obtain controllable direct-current voltage;
The sectional voltage-increasing circuit consists of a resistor R 2、R3, a capacitor C 3、C4, a power switch tube T 2、T3, a diode D 9、D10, a first voltage sensor, a second driving circuit and a second PWM control circuit, and is connected with the DC/DC voltage-regulating circuit and used for sectionally conducting the switch tube according to a preset pulse width signal and inhibiting a current peak at the moment of phase change so as to reduce the impact of the current peak on the switch tube and buffer the DC voltage obtained by the DC/DC voltage-regulating circuit;
The full-bridge inverter circuit consists of a power switch tube T 4、T5、T6、T7, an inductance L 2、L3, a third PWM control circuit and a third driving circuit, and is connected with the segmented pressurizing circuit and used for performing inversion treatment on the direct-current voltage buffered by the segmented pressurizing circuit through modulating the frequency and the duty ratio, and obtaining alternating-current voltage with amplitude, frequency and duty ratio capable of being adjusted as required at the primary side of the step-up transformer;
the step-up transformer is connected with the full-bridge inverter circuit and is used for boosting the alternating-current voltage obtained at the primary side to obtain high-voltage variable-frequency rectangular-wave alternating-current voltage with controllable voltage, frequency and pulse width, and the output end of the step-up transformer is connected with the electrode of the crude oil electric dehydrator to provide 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 control requirements and controlling the DC/DC voltage regulating circuit, the segmented voltage regulating circuit and the full-bridge inverter circuit.
According to the technical scheme provided by the invention, the problems of large current peak and serious electromagnetic interference of the power switch tube are overcome, so that the power supply has higher running stability, better reliability and better performance, and the service life of the power supply device is effectively prolonged under the same running environment state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an AC pulse crude oil dehydration power supply device with pulse width fractional pressurization function according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of the output process of the PWM and transformer of the segmented voltage circuit and the full-bridge inverter circuit according to the embodiment of the invention;
FIG. 3 is another waveform diagram of the output process of the PWM and transformer of the segmented voltage circuit and the full-bridge inverter circuit according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a direct hysteresis process for generating a double ended PWM process with f min -40 kHz according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The following will describe embodiments of the present invention in further detail with reference to the accompanying drawings, and as shown in fig. 1, the structure of the ac pulse crude oil dehydration power supply device with pulse width and fractional pressurization functions provided by the embodiments of the present invention mainly includes a rectifying and filtering circuit, a DC/DC voltage regulating circuit, a fractional 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 consists of a rectification diode D 1、D2、D3、D4、D5、D6, a piezoresistor RV 1、RV2、RV3、RV4 and a filter capacitor C 1, and 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 consists of a power switch tube T 1, a capacitor C 2, a diode D 7、D8, an inductor L 0、L1, a resistor R 1, a first PWM closed-loop control circuit and a first driving circuit, and is connected with the rectifying and filtering circuit and used for carrying out voltage reduction treatment on the stable direct-current voltage obtained by the rectifying and filtering circuit to obtain controllable direct-current voltage;
The sectional voltage-increasing circuit consists of a resistor R 2、R3, a capacitor C 3、C4, a power switch tube T 2、T3, a diode D 9、D10, a first voltage sensor, a second driving circuit and a second PWM control circuit, and is connected with the DC/DC voltage-regulating circuit and used for sectionally conducting the switch tube according to a preset pulse width signal and inhibiting a current peak at the moment of phase change so as to reduce the impact of the current peak on the switch tube and buffer the DC voltage obtained by the DC/DC voltage-regulating circuit;
The full-bridge inverter circuit consists of a power switch tube T 4、T5、T6、T7, an inductance L 2、L3, a third PWM control circuit and a third driving circuit, and is connected with the segmented pressurizing circuit and used for performing inversion treatment on the direct-current voltage buffered by the segmented pressurizing circuit through modulating the frequency and the duty ratio, and obtaining alternating-current voltage with amplitude, frequency and duty ratio capable of being adjusted as required at the primary side of the step-up transformer;
the step-up transformer is connected with the full-bridge inverter circuit and is used for boosting the alternating-current voltage obtained at the primary side to obtain high-voltage variable-frequency rectangular-wave alternating-current voltage with controllable voltage, frequency and pulse width, and the output end of the step-up transformer is connected with the electrode of the crude oil electric dehydrator to provide 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 control requirements and controlling the DC/DC voltage regulating circuit, the segmented voltage regulating 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:
The input single-phase or three-phase alternating current is connected with the anode of a rectifying diode D 1 and the cathode of a rectifying diode D 4, the anode of a rectifying diode D 2 and the cathode of a rectifying diode D 5, and the anode of a rectifying diode D 3 and the cathode of a rectifying diode D 6;
A piezoresistor RV 1 is connected between the U end and the V end of the single-phase or three-phase alternating current, a piezoresistor RV 2 is connected between the V end and the W end, and a piezoresistor RV 3 is connected between the U end and the W end;
A piezoresistor RV 4 and a filter capacitor C 1 are connected in parallel between the cathode of the rectifying diode D 1、D2、D3 and the anode of the rectifying diode D 4、D5、D6.
The connection relation of each component in the DC/DC voltage regulating circuit is as follows:
an output 1 end of the rectifying and filtering circuit is connected in series with an inductor L 0 of the DC/DC voltage regulating circuit and a power switch tube T 1;
an emitter E end of the power switch tube T 1 is connected with a diode D 7, a diode D 8 and an inductor L 1 in series;
the inductor L 1 is connected to the output 2 end of the rectifying and filtering circuit, and the resistor R 1 is connected to the two ends of the inductor L 1 in parallel;
A capacitor C 2 is connected in parallel between the anode of the diode D 7 or the cathode of the diode D 8 and the output 1 end of the rectifying and filtering circuit;
The first PWM closed-loop control circuit is connected with the gate G end of the power switch tube T 1 through a first driving circuit.
The connection relation of all the components in the sectional pressurizing circuit is as follows:
The collector C end of the power switch tube T 2 in the sectional pressurizing circuit is connected with the output 1 end of the DC/DC voltage regulating circuit; the collector C end of the power switch tube T 3 is connected with the output 1 end of the DC/DC voltage regulating circuit through a capacitor C 3, and the collector C end of the power switch tube T 3 is simultaneously connected with the output 2 end of the DC/DC voltage regulating circuit through a capacitor C 4;
An emitter E end of the power switch tube T 2 is connected with a diode D 9 in series, and an emitter E end of the power switch tube T 3 is connected with a diode D 10 in series; and diode D 9 is commonly connected with diode D 10;
The resistors R 2 and R 3 are respectively connected in parallel with the two ends of the capacitors C 3 and C 4, and a first voltage sensor is arranged between the output 1 end and the output 2 end of the DC/DC voltage regulating circuit;
The first voltage sensor feeds back the collected voltage and voltage signals V f at two ends of the resistor R 2、R3 to a first PWM closed-loop control circuit of the DC/DC voltage regulating circuit; wherein the voltage signal V f includes an output voltage of the DC/DC voltage regulating circuit or an input voltage of the segment pressurizing circuit;
The first PWM closed-loop control circuit performs difference comparison on the received voltage signal V f and the set voltage signal V g, then performs closed-loop control to output a first PWM pulse, and the first PWM pulse acts on a gate G end of a power switch tube T 1 of the DC/DC voltage regulating circuit after passing through a first driving circuit of the DC/DC voltage regulating circuit;
The second PWM control circuit is connected with the grid electrode G end of the power switch tube T 2 and the grid electrode G end of the power switch tube T 3 through the second driving circuit respectively.
The connection relation of each component in the full-bridge inverter circuit is as follows:
The output positive electrode of the segmented pressurizing circuit, namely the cathode of the diode D 9、D10, is connected with the collector C end of the power switch tube T 4、T6 in the full-bridge inverter circuit;
The output negative electrode of the segmented pressurizing circuit, namely the 2 end of the resistor R 3, is connected with the emitter E end of the power switch tube T 5、T7 in the full-bridge inverter circuit;
An emitter E end of the power switch tube T 4 is connected with a collector C end of the power switch tube T 5 through an inductor L 3 and a B end of the primary side of the step-up transformer B 1, and an emitter E end of the power switch tube T 6 is connected with a collector C end of the power switch tube T 7 through an inductor L 2 and an A end of the primary side of the step-up transformer B 1;
The C end and the D end of the output side of the step-up transformer B 1 are connected to the electrode of the crude oil electric dehydrator;
The third PWM control circuit is connected with the grid electrode G end of the power switch tube T 4, the power switch tube T 5, the power switch tube T 6 and the power switch tube T 7 through a third driving circuit respectively.
In addition, in a specific implementation, the digital control circuit taking the microprocessor as a core sectionally conducts the power switch tube of the sectionalized pressurizing circuit through the generated double-end PWM signal with adjustable pulse width, and when the double-end PWM signal controls the on-off of the power switch tube to realize the sectionalized pressurizing function, the sectionalized pressurizing circuit and the full-bridge inverter circuit work in a mutually matched mode according to a certain time sequence, and the specific process is as follows:
When any one group of bridge arms in the full-bridge inverter circuit receives a driving signal to conduct, a power switch tube T 3 of the segmented pressurizing circuit is also conducted, and in the working process of the full-bridge inverter circuit, a power switch tube T 3 is always in a conducting state, as shown in a waveform diagram of the output process of the segmented pressurizing circuit, the full-bridge inverter circuit PWM and a transformer in the embodiment of the invention. Or the full-bridge inverter circuit is turned off at the time of selecting after the low-voltage phase change process is finished, as shown in fig. 3, another waveform diagram is shown, and at the moment, a relatively low voltage is added 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 driving circuit of the segmented pressurizing circuit drives the power switching tube T 2 to be conducted, the primary side full-amplitude of the step-up transformer is added with the front-stage voltage, and the power switching tube T 2 can be turned off at any time in a time period between the time when one group of bridge arms are turned off (including the turn-off moment) and the time when the other group of bridge arms are turned on;
Along with the alternate conduction of the two bridge arms of the full-bridge inverter circuit, the two power switch tubes T 2、T3 in the segmented pressurizing circuit repeat the above actions, so that the pole plate high-voltage amplitude step-up is realized, and the conduction time of the two power switch tubes T 2、T3 in the segmented pressurizing circuit is regulated by the second PWM control circuit.
In addition, the pulse width in one period of the double-ended PWM signal can be set by setting the value of the comparison register.
The method for generating the double-end PWM signal with the adjustable pulse width by the digital control circuit taking the microprocessor as a core is a direct hysteresis method, specifically uses two timer resources of the microprocessor, so that the two timers are started simultaneously, the initial value of the second timer is half period larger than that of the first timer, the other parameters are set completely the same, and the double-end PWM with 180-degree phase difference can be generated by the direct hysteresis method.
For the timer resources of a microprocessor with PWM special function output ports, a comparison register and a period register are generally provided, and the comparison register and the period register have an auto-load function.
For example, as shown in fig. 4, a schematic diagram of a process of generating the double-ended PWM signal with frequency f min -40 kHz by the direct hysteresis method according to the embodiment of the present invention is shown, let the period of the double-ended PWM signal shown in fig. 4 be T, the positive bandwidth of each path of PWM signal be T ON, and the count input frequency of the microprocessor timer resource be f cpu. The calculation formula of the value TxPR of the period register is TxPR =tx×f cpu -1, the calculation formula of the value of the comparison register is TxCMPR = TxPR-T ON×fcpu, the initial value of the timer generating the first PWM signal is 0, and the initial value of the timer generating the second PWM signal is TxIni =tx×f cpu/2-1. Specific generation of the double-ended PWM is shown in fig. 2, where the pulse width of the modulated double-ended PWM signal only needs to change the value of the comparison register.
The minimum frequency f min＝fcpu/TxPRMax of the double ended PWM signal is generated by the direct hysteresis method, wherein 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 direct hysteresis method is adopted when the frequency of the double-end PWM signal is between f min and 40 kHz; if the frequency of the double-ended PWM signal is between 0 and f min (low-frequency double-ended PWM signal), the corresponding operation is adopted after the counting period of the register and the comparison matching frequency are counted.
In addition, the digital control circuit taking the microprocessor as a core can control the DC/DC voltage regulating circuit to quickly regulate the output voltage according to the requirement, and control the output voltage to periodically change in a waveform (such as a sine form, an exponential form and the like) of a specific form according to the set frequency; wherein, the closed loop feedback control adopts a constant frequency modulation pulse width mode, and the control algorithm adopts a digital incremental PID algorithm.
The power supply device based on the structure has the advantages that the output voltage range of the DC/DC voltage regulating circuit is 0.5-500V; the voltage regulating range of the high-voltage variable-frequency rectangular wave alternating-current voltage obtained after the step-up transformer is stepped up is 100V-40 kV, the frequency regulating range is 0 Hz-40 kHz, and the pulse width regulating range is 0-49%.
It is noted that what is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art.
In summary, the device according to the embodiment of the 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 regulating part adopts a non-isolated voltage regulating mode, so that the efficiency is higher;
(2) The novel voltage reduction topological structure adopted by the DC/DC voltage regulation loop is simple in circuit connection, convenient to maintain, easy to control, high in power supply conversion efficiency and longer in service life of the power supply in the same operation environment state;
(3) The sectional pressurizing circuit is used for sectionally conducting the switching tube according to a preset pulse width signal, so that the polar plate high voltage rises to the amplitude voltage in a stepped manner at the instant of phase change, meanwhile, the current peak in the full-bridge inverter circuit at the instant of phase change is restrained, the impact of the current peak on the switching tube is reduced, the service life of the switching tube is prolonged to a certain extent, the switching loss is reduced, the safety and the reliability of the circuit are improved, and the crude oil dehydration efficiency is further improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (7)

1. The alternating current pulse crude oil dehydration power supply device with the pulse width and sectional pressurizing functions is characterized by comprising a rectification filter circuit, a DC/DC voltage regulating circuit, a sectional pressurizing 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 consists of a rectification diode D 1、D2、D3、D4、D5、D6, a piezoresistor RV 1、RV2、RV3、RV4 and a filter capacitor C 1, and 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 consists of a power switch tube T 1, a capacitor C 2, a diode D 7、D8, an inductor L 0、L1, a resistor R 1, a first PWM closed-loop control circuit and a first driving circuit, and is connected with the rectifying and filtering circuit and used for carrying out voltage reduction treatment on the stable direct-current voltage obtained by the rectifying and filtering circuit to obtain controllable direct-current voltage;
The sectional voltage-increasing circuit consists of a resistor R 2、R3, a capacitor C 3、C4, a power switch tube T 2、T3, a diode D 9、D10, a first voltage sensor, a second driving circuit and a second PWM control circuit, and is connected with the DC/DC voltage-regulating circuit and used for sectionally conducting the switch tube according to a preset pulse width signal and inhibiting a current peak at the moment of phase change so as to reduce the impact of the current peak on the switch tube and buffer the DC voltage obtained by the DC/DC voltage-regulating circuit;
The full-bridge inverter circuit consists of a power switch tube T 4、T5、T6、T7, an inductance L 2、L3, a third PWM control circuit and a third driving circuit, and is connected with the segmented pressurizing circuit and used for performing inversion treatment on the direct-current voltage buffered by the segmented pressurizing circuit through modulating the frequency and the duty ratio, and obtaining alternating-current voltage with amplitude, frequency and duty ratio capable of being adjusted as required at the primary side of the step-up transformer;
the step-up transformer is connected with the full-bridge inverter circuit and is used for boosting the alternating-current voltage obtained at the primary side to obtain high-voltage variable-frequency rectangular-wave alternating-current voltage with controllable voltage, frequency and pulse width, and the output end of the step-up transformer is connected with the electrode of the crude oil electric dehydrator to provide 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 control requirements and controlling the DC/DC voltage regulating circuit, the segmented voltage regulating circuit and the full-bridge inverter circuit;
The digital control circuit taking the microprocessor as a core is used for sectionally conducting the power switch tube of the sectionalized pressurizing circuit through the generated double-end PWM signal with adjustable pulse width, and when the double-end PWM signal controls the on-off of the power switch tube to realize the sectionalized pressurizing function, the sectionalized pressurizing circuit and the full-bridge inverter circuit work in a mutually matched mode according to a certain time sequence, and the specific 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 are conducted, the other group of bridge arms are in an off state, when any group of bridge arms in the full-bridge inverter circuit receive a drive signal to conduct, a power switch tube T 3 of the segmented pressurizing circuit is also conducted, in the working process of the full-bridge inverter circuit, the power switch tube T 3 is always in a conducting state or is closed at a time after the low-voltage phase-change process of the full-bridge inverter circuit is finished, and at the moment, a relatively low voltage is added 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 driving circuit of the segmented pressurizing circuit drives the power switch tube T 2 to be conducted, the primary side full-amplitude of the step-up transformer is added with the front-stage voltage, and the power switch tube T 2 can be turned off at any time in a time period between the turn-off of one group of bridge arms and the turn-on of the other group of bridge arms;
Along with the alternate conduction of the two bridge arms of the full-bridge inverter circuit, the two power switching tubes T 2、T3 in the sectional pressurizing circuit repeat the actions so as to realize the step-by-step rising of the polar plate high-voltage amplitude, and the conduction time of the two power switching tubes T 2、T3 in the sectional pressurizing circuit is regulated by the second PWM control circuit;
The method for generating the double-end PWM signal with the adjustable pulse width by the digital control circuit taking the microprocessor as a core is a direct hysteresis method, specifically, 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 period larger than that of the first timer, the other parameters are set completely the same, and the double-end PWM with 180-degree phase difference can be generated by the direct hysteresis method.
2. The ac pulse crude oil dehydration power supply device with pulse width segmented pressurizing function according to claim 1, wherein the connection relation of each component in the rectifying and filtering circuit is:
The input single-phase or three-phase alternating current is connected with the anode of a rectifying diode D 1 and the cathode of a rectifying diode D 4, the anode of a rectifying diode D 2 and the cathode of a rectifying diode D 5, and the anode of a rectifying diode D 3 and the cathode of a rectifying diode D 6;
A piezoresistor RV 1 is connected between the U end and the V end of the single-phase or three-phase alternating current, a piezoresistor RV 2 is connected between the V end and the W end, and a piezoresistor RV 3 is connected between the U end and the W end;
A piezoresistor RV 4 and a filter capacitor C 1 are connected in parallel between the cathode of the rectifying diode D 1、D2、D3 and the anode of the rectifying diode D 4、D5、D6.
3. The ac pulse crude oil dehydration power supply device with pulse width fractional pressurization function according to claim 1, wherein the connection relation of each component in the DC/DC voltage regulating circuit is:
an output 1 end of the rectifying and filtering circuit is connected in series with an inductor L 0 of the DC/DC voltage regulating circuit and a power switch tube T 1;
an emitter E end of the power switch tube T 1 is connected with a diode D 7, a diode D 8 and an inductor L 1 in series;
the inductor L 1 is connected to the output 2 end of the rectifying and filtering circuit, and the resistor R 1 is connected to the two ends of the inductor L 1 in parallel;
a capacitor C 2 is connected in parallel between the anode of the diode D 7 and the output 1 end of the rectifying and filtering circuit;
The first PWM closed-loop control circuit is connected with the gate G end of the power switch tube T 1 through a first driving circuit.
4. The ac pulse crude oil dehydration power supply device with pulse width and sectional pressurizing function according to claim 1, wherein the connection relation of each component in the sectional pressurizing circuit is:
The collector C end of the power switch tube T 2 in the sectional pressurizing circuit is connected with the output 1 end of the DC/DC voltage regulating circuit; the collector C end of the power switch tube T 3 is connected with the output 1 end of the DC/DC voltage regulating circuit through a capacitor C 3, and the collector C end of the power switch tube T 3 is simultaneously connected with the output 2 end of the DC/DC voltage regulating circuit through a capacitor C 4;
An emitter E end of the power switch tube T 2 is connected with a diode D 9 in series, and an emitter E end of the power switch tube T 3 is connected with a diode D 10 in series; and diode D 9 is commonly connected with diode D 10;
The resistors R 2 and R 3 are respectively connected in parallel with the two ends of the capacitors C 3 and C 4, and a first voltage sensor is arranged between the output 1 end and the output 2 end of the DC/DC voltage regulating circuit;
The first voltage sensor feeds back the collected voltage and voltage signals V f at two ends of the resistor R 2、R3 to a first PWM closed-loop control circuit of the DC/DC voltage regulating circuit; wherein the voltage signal V f includes an output voltage of the DC/DC voltage regulating circuit or an input voltage of the segment pressurizing circuit;
The first PWM closed-loop control circuit performs difference comparison on the received voltage signal V f and the set voltage signal V g, then performs closed-loop control to output a first PWM pulse, and the first PWM pulse acts on a gate G end of a power switch tube T 1 of the DC/DC voltage regulating circuit after passing through a first driving circuit of the DC/DC voltage regulating circuit;
The second PWM control circuit is connected with the grid electrode G end of the power switch tube T 2 and the grid electrode G end of the power switch tube T 3 through the second driving circuit respectively.
5. The ac pulse crude oil dehydration power supply device with pulse width internal stage pressurizing function according to claim 1, wherein the connection relationship of each component in the full-bridge inverter circuit is:
The output positive electrode of the segmented pressurizing circuit, namely the cathode of the diode D 9、D10, is connected with the collector C end of the power switch tube T 4、T6 in the full-bridge inverter circuit;
The output negative electrode of the segmented pressurizing circuit, namely the 2 end of the resistor R 3, is connected with the emitter E end of the power switch tube T 5、T7 in the full-bridge inverter circuit;
An emitter E end of the power switch tube T 4 is connected with a collector C end of the power switch tube T 5 through an inductor L 3 and a B end of the primary side of the step-up transformer B 1, and an emitter E end of the power switch tube T 6 is connected with a collector C end of the power switch tube T 7 through an inductor L 2 and an A end of the primary side of the step-up transformer B 1;
The C end and the D end of the output side of the step-up transformer B 1 are connected to the electrode of the crude oil electric dehydrator;
The third PWM control circuit is connected with the grid electrode G end of the power switch tube T 4, the power switch tube T 5, the power switch tube T 6 and the power switch tube T 7 through a third driving circuit respectively.
6. The AC pulse crude oil dehydration power supply device with pulse width fractional pressurization function according to claim 1, wherein,
The digital control circuit taking the microprocessor as a core can control the DC/DC voltage regulating circuit to quickly regulate the output voltage according to the requirement, and control the output voltage to periodically change in a waveform of a specific form according to a set frequency according to the requirement; wherein, the closed loop feedback control adopts a constant frequency modulation pulse width mode, and the control algorithm adopts a digital incremental PID algorithm.
7. The AC pulse crude oil dehydration power supply device with pulse width fractional pressurization function according to claim 1, wherein,
The output voltage range of the DC/DC voltage regulating circuit is 0.5-500V;
The voltage regulating range of the high-voltage variable-frequency rectangular wave alternating-current voltage obtained after the step-up transformer is stepped up is 100V-40 kV, the frequency regulating range is 0 Hz-40 kHz, and the pulse width regulating range is 0-49%.
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CN113179029B (en) * 2021-05-28 2024-06-21 北京石油化工学院 DC/DC voltage regulation-based high-voltage variable-frequency rectangular alternating-current pulse crude oil electric dehydration power supply device
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