CN201648318U - All-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device for crude oil dehydration - Google Patents
All-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device for crude oil dehydration Download PDFInfo
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- CN201648318U CN201648318U CN2009202925124U CN200920292512U CN201648318U CN 201648318 U CN201648318 U CN 201648318U CN 2009202925124 U CN2009202925124 U CN 2009202925124U CN 200920292512 U CN200920292512 U CN 200920292512U CN 201648318 U CN201648318 U CN 201648318U
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Abstract
An all-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device suitable for crude oil dehydration mainly comprises a rectification filter circuit, a primary bridge inversion direct current voltage regulating circuit, a secondary bridge inverter circuit, a boosting transformer, a digital control circuit with a microprocessor as a core and a control mode of the digital control circuit. The primary bridge inversion direct current voltage regulating circuit realizes constant voltage control by adopting digital incremental PID algorithm for regulating pulse width of digital PWM signals, and double-end PWM control signals of the secondary bridge inverter circuit are directly outputted by the microprocessor. Voltage of high-voltage variable-frequency rectangular-wave alternating current voltage output is regulated within the range between 100V and 40kV, frequency of the voltage output is regulated within the range of 0Hz and 40Hz, and pulse width of the voltage output is regulated within the range between 0 and 49%. The all-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current crude oil dehydration power supply device has the advantages of 1 high efficiency and fine voltage regulation performance when compared with a crude oil dehydration power supply using a primary inversion structure, and 2 favor in suppressing magnetic biasing of the transformer and easy realization of complicated control functions by adopting digitalized PWM control modes in the primary inversion direct current voltage regulating circuit and the secondary inverter circuit.
Description
Technical field
The utility model relates to a kind of digital control secondary contravariant high-pressure frequency-conversion rectangular-wave alternating-current supply unit, specifically, is a kind of digital control secondary contravariant high-pressure frequency-conversion rectangular-wave alternating-current supply unit that is applicable to crude oil electric dewatering and electric desalting.
Background technology
Crude oil in the stratum contains a large amount of water and salt inevitably, and along with the oil field enters the high water-cut stage mining phase, the comprehensive moisture content of most of oil well produced liquid is up to 90%.In addition, in order to improve recovery ratio, the general tertiary oil recovery technology that adopts carries out Oil extraction, by displacing crude oil to underground injection oil-displacing agent, these oil-displacing agents make the composition of extraction liquid and oil-water emulsion state very complicated, and emulsion viscosity is big, dispersion particle is trickle, and these extraction liquid are carried out breakdown of emulsion and the sedimentation operation is all very difficult, and cause the insulativity variation of oil product, often make between the electrical dehydrator pole plate and produce short circuit phenomenon.Water content in crude oil height and profit. the emulsified state complexity has all been brought many negative impacts to links such as follow-up accumulating, refining processing, therefore generally need carry out processed so that the moisture massfraction before failing outside it is lower than 0.5% to crude oil in the oil field; And before refinery advances water distilling apparatus, need further to dewater, desalting treatment and make its moisture massfraction be reduced to 0.1%～0.2%, and the mass concentration that makes the salt component is less than 5mg/L.If three times extraction liquid profit treatment process technology can not get solving well, will become the key of producing on popularization of restriction tertiary oil recovery technology and the maturing field stable yields.Crude oil electric dewatering relies on the effect of electrical forces that water-in-oil type emulsion is carried out breaking emulsion and dewatering, because of its efficient height, speed have obtained widespread usage in each oil field soon.
Why the disperse phase particle water can be suspended in the crude oil and can stablize the long duration, is because one deck emulsifying film is arranged around the disperse phase particle water.Emulsifying film can produce stronger bonding force with the disperse phase particle water, also can produce stronger bonding force with crude oil, make disperse phase particle water rapid subsidence, must smash emulsifying film.The positive and negative ion of salt is all contained in little disperse phase particle water inside in the crude oil generally speaking, after in crude oil, adding the high-frequency and high-voltage alternating-electric field, little disperse phase particle water is polarized, these negative ions can be to the positive and negative direction quick travel of electric field, generation internal friction heat constantly overcomes film toughness.Polarized little disperse phase particle water combines and forms big disperse phase particle water, quickens sedimentation and makes oily water separation (Fig. 1).The same optimum value that is fit to dehydration that exists of the frequency of alternating electric field, under this frequency, average impact force is strong.
The effect of crude oil electric dewatering is also relevant with the waveform of voltage.Calendar year 2001, U.S. Natco group has provided the conclusion that is unfavorable for pulsed D C electric field by experiment: under identical frequency, for obtaining the same required strength of electric field that applies of coalescence efficiency pulsed D C electric field than the required strength of electric field height that applies of AC electric field.Common interchange dehydration power supply belongs to the electric field that slowly changes for low face simple alternating current or near sinusoidal interchange, and is not strong to the surging force of emulsifying film.The ac square wave electric field jumps to maximum value by zero beginning moment, and the positive and negative ion in the disperse phase particle water is quickened to greatest extent, can form intensive to emulsifying film and impact.
Dehydrating of crude oil needs certain strength of electric field, but intensity is suitable, too highly can produce electrodispersion, make the disperse phase particle water with thinner particle suspension in crude oil; Coalescent and dipole coalescence can not be shaken between too low particle water, the profit sharp separation can not be realized.
From the electrical property of emulsion as can be known, any emulsion all has its critical breakdown electric field intensity, when the strength of electric field that adds exceeds its critical electric field strength, milk sap can be short-circuited, the short circuit meeting disappeared after electric field disappeared, and its critical electric field strength of emulsion of different nature, short circuit formation time and short circuit extinction time also have nothing in common with each other.Particularly three extraction liquid disruptive critical voltages are low, and the short circuit extinction time is long, is difficult to send electricity with conventional electrical dehydrator, and often cause the water trap inter-electrode short-circuit, and are very unfavorable to dehydrating of crude oil.Can make high-frequency impulse output time (pulse width) less than the short circuit formation time by adjusting crude oil dehydration electric power high frequency frequency of rectangular wave and dutycycle, the pitch time of high-frequency impulse be greater than the short circuit extinction time.That is to say that before milk sap square road formed, the high-frequency ac pulse just disappeared, the milk sap short circuit disappears, and insulating property next pulse occurs after recovering again.
In sum, in order to obtain dehydrating effect preferably, in the crude oil dehydration process of reality, need the parameters such as water ratio, surface tension, density, pressure, temperature of based on crude to adjust parameters such as crude oil dehydration electric power frequency of rectangular wave, voltage and dutycycle according to certain numerical relationship model, and the control power supply move under this parameter.At present, the AC power of electrical dehydrator use mainly contains two kinds of forms.A kind of is the simple alternating current high-voltage power supply of power frequency 50Hz.When this high-voltage power supply is used for crude oil, exist certain droplet to disperse electric field region and invalid electric field region, dewatering efficiency is low.
Another kind is the inversion type crude oil dehydration electric power (Fig. 2) that adopts an inverter structure, and controlled or uncontrollable full-wave rectification pattern is adopted in the prime direct current input of inverter circuit.The Chinese patent (grant number CN1171957C) of Inst. of Plan and Design, Shengli Oil Field, China Petrochemical Corp.'s application has been set forth a kind of Highfrequency pulse raw oil electric dewatering device, this device is made up of high frequency electric source producer, high frequency vertoro and high-frequency electrical water trap etc. for adopting the contravariant dehydration power supply of an inverter structure.The high frequency electric source producer mainly is made up of triphase silicon rectification circuit, frequency conversion main power circuit, driving circuit, pulse-width modulation circuit, pulse boostering circuit, square wave output rating behind the high frequency vertoro that the high frequency electric source producer produces is 5～50kVA, voltage is 20～35kV (adjustable), and frequency is the rectangle square wave of 1000～2500Hz (step-less adjustment).It is big and regulate difficulty, pulse-repetition poor stability and regulate shortcomings such as difficulty that this crude oil power supply dewatering unit exists that efficient is low, volume is big, output voltage is regulated step-length.
In the U.S. Pat 6860979B2 and US7351320B2 of the application of U.S. Natco group, double frequency and multiple electrostatic coalescence treatment technology have frequently been set forth respectively.Electrostatic coalescence power-supply system in two patents all is made up of controller, rectifier, setter, chopper and intermediate frequency step-up transformer etc. based on PC.To at first the three-phase alternating current electric rectification be produced a direct current voltage in the working process, setter is adjusted to volts DS with frequency f
2The various forms of voltage signals that change; Chopper is reverse into this voltage signal with fundamental frequency f
1The voltage of alternating current that changes, the former limit of supply intermediate frequency step-up transformer, the intermediate frequency step-up transformer is elevated to this input voltage is enough to produce effectively coalescent degree of particle water.The voltage output of step-up transformer secondary is f by a series of frequencies
1The basic communication signal form, but meanwhile the peak values of ac voltage of this baseband signal again with frequency f
2Change (f
2Be also referred to as and adjust frequency).Generally speaking, f
1Will be much larger than f
2, f wherein
1Span between 60～2500Hz, f
2Span between 0.1～100Hz.The fundamental frequency of this electrostatic coalescence power-supply system is lower and regulation range is little, can not adjust the dutycycle of fundamental frequency signal in addition.
From the control mode of bridge inverter main circuit, the frequency of bridge inverter main circuit shown in Figure 2 and pulsewidth generally adopt analog control mode, and simulation pwm chips such as SG3525, UC3846, TL494 are adopted in the generation of width modulation (PWM) waveform.Analog control mode components and parts number is numerous, and the circuit structure complexity is carried out the restriction that the complicated ability of controlling is subjected to circuit structure according to mathematical model.Numerous components and parts have also increased the debugging difficulty of controller simultaneously, have reduced stability, reliability and the maintainability of Controlling System.In addition, the simulation pwm chip is because of voltage instability, have that the positive-negative half-cycle ON time does not wait in the one-period, the frequency of PWM waveform and inherent defects such as pulsewidth less stable and adjusting difficulty, cause crude oil dehydration electric power main-transformer and step-up transformer that shortcomings such as magnetic bias and running noises are big take place easily.
In April, 2009, China Petroleum Univ. (East-China) has applied for the patent (application number 200910020710.X) of dewatering power supply for rectangular-wave alternating-current crude oil, has set forth a kind of by based on the dc voltage regulator circuit of semi-bridge inversion structure, full-bridge inverting square wave generative circuit, be the voltage regulator control circuit of core, be the dewatering power supply for rectangular-wave alternating-current crude oil that the square wave of core generates pilot circuit, forms based on the optimal control circuit and the intermediate frequency step-up transformer of PLC and industry control touch-screen based on the SG3525 pulse width modulating chip with the TL494 pulse width modulating chip.Though the main power circuit of this square wave crude oil dehydration electric power adopts the secondary inverter structure, but voltage regulator control circuit and square wave generate pilot circuit and still adopt aforementioned analog control mode, and current rectifying and wave filtering circuit of main power circuit exchanges input and only adopts single phase ac (220V/50Hz) input, causes the crude oil dehydration electric power output rating to be limited to.In addition, adopt PLC output simulating signal to generate voltage, frequency and the pulsewidth that pilot circuit comes modulation power source output, have shortcomings such as cost height and pilot circuit complex structure to voltage regulator control circuit and square wave.
In view of the foregoing, be necessary further to develop the deficiency that new type digital control secondary contravariant dewatering power supply for rectangular-wave alternating-current crude oil overcomes above-mentioned crude oil dehydration electric power device.
Summary of the invention
An existing inverter structure crude oil dehydration electric power efficient is low, weight big and the prime DC input voitage is regulated the big shortcoming of step-length in order to overcome; Avoid that positive-negative half-cycle ON time in the analog control mode output PWM waveform one-period is unequal, the frequency of PWM waveform and pulsewidth less stable and regulate inherent defects such as difficulty; Solve analog control circuit and be difficult to a difficult problem of dehydration voltage of supply, pulsewidth and frequency being regulated according to certain mathematical model, the utility model provides a kind of crude oil dehydration electric power device of novel digital control secondary inverter structure.
The technical solution of the utility model is achieved in that
A kind of digital control secondary contravariant high-pressure frequency-conversion exchanges the crude oil dehydration electric power device, and its special character is to comprise current rectifying and wave filtering circuit, is used for that single-phase or three-phase alternating current are carried out rectifying and wave-filtering and handles, and obtains volts DS output; A bridge type inverse dc voltage regulator circuit is connected with described current rectifying and wave filtering circuit, is used for that described volts DS is carried out high-frequency inversion and handles, and by the duty ratio modulation rectification, the big I of output voltage is the volts DS of quick adjustment as required; The secondary bridge inverter main circuit, be connected with a described bridge type inverse dc voltage regulator circuit, be used for volts DS to described quick adjustment and carry out inversion and handle, by frequency and duty ratio modulation, the voltage of alternating current that all can regulate as required to the former limit of step-up transformer output amplitude, frequency and dutycycle; Step-up transformer is connected with described secondary bridge inverter main circuit, and being used for the aforementioned voltage of alternating current in the former limit of transformer is elevated to is enough to produce effectively coalescent degree of particle water; With the microprocessor is the digital control circuit of core, is used for producing the digital PWM control signal according to demand for control, controls bridge type inverse dc voltage regulator circuit and secondary bridge inverter main circuit.Wherein, described current rectifying and wave filtering circuit is made of rectifier circuit MD, filter capacitor C; Being connected to of described its each terminal of current rectifying and wave filtering circuit: the U end of three-phase or single phase alternating current, V end, W end are connected with 1 end, 2 ends, 3 ends of rectifier circuit MD respectively, are parallel with filter capacitor C between 4 ends of rectifier circuit MD and 5 ends.
Wherein, a described bridge type inverse dc voltage regulator circuit is by bridge inverter main circuit, the first transformer B
1, the first diode D
1, the second diode D
2, the first afterflow inductance L
1, the 3rd capacitor C
3, first voltage sensor, first driving circuit, the first closed loop pwm control circuit form; Being connected to of described each terminal of bridge type inverse dc voltage regulator circuit: 4 ends of rectifier circuit MD are connected to the first power switch pipe T
1Collector electrode C, 5 ends of rectifier circuit MD are connected to the second power switch pipe T
2Emitter E; Inverter circuit adopts full-bridge or half-bridge inversion circuit topological framework, the first power switch pipe T
1The emitter E and the second power switch pipe T
2Collector electrode C link to each other; The first power switch pipe T
1Collector electrode C through first capacitor C
1After be connected the first transformer B
1A end, the second power switch pipe T
2Emitter E through second capacitor C
2After be connected the first transformer B
1A end; The first transformer B
1B end be connected the first power switch pipe T
1Emitter E and second switch pipe T
2Collector electrode C between; The first transformer B
1C end through the first diode D
1The back and the first afterflow inductance L
11 end connect the first transformer B
1D end through the second diode D
2The back and the first afterflow inductance L
11 end connect; The first afterflow inductance L
12 ends and the 3rd capacitor C
31 end link to each other the first transformer B
1E end and the 3rd capacitor C
32 ends link to each other and the 3rd capacitor C
3Also there is first voltage sensor at two ends; The 3rd capacitor C that first voltage sensor will collect
3The voltage V at two ends
f(i.e. the output voltage of inverter circuit output voltage or secondary inverter circuit) feeds back to a PWM closed control circuit, the feedback voltage signal V of a PWM closed control circuit to receiving
fWith give determining voltage signal V
gCarry out the relatively back closed-loop control of difference and export first pwm pulse, described first pulse acts on the first power switch pipe T respectively behind first driving circuit
1The grid G and the second power switch pipe T
2Grid G on.Wherein, described secondary bridge inverter main circuit is by the 3rd power switch pipe T
3, the 4th power switch pipe T
4, the 5th power switch pipe T
5, the 6th power switch pipe T
6Form.Being connected to of described each terminal of secondary bridge inverter main circuit: the positive pole of aforementioned inversion direct current pressure-control circuit output (is the afterflow inductance L
12 ends or the 3rd capacitor C
31 end) respectively with the 3rd power switch pipe T
3Collector electrode C end, the 5th power switch T
5Collector electrode C end link to each other; The negative pole of aforementioned inversion direct current pressure-control circuit output (the i.e. first transformer B
1E end and the 3rd capacitor C
32 ends) respectively with the 4th power switch T
4Emitter E end, the 6th power switch T
6The emitter E end link to each other; The 3rd power switch pipe T
3Emitter E end and the 4th power switch pipe T
4Collector electrode C end link to each other the 5th power switch pipe T
5Emitter E end and the 6th power switch pipe T
6Collector electrode C end link to each other; Step-up transformer B
2A end be connected the 3rd power switch pipe T
3Emitter E end and the 4th power switch pipe T
4Collector electrode C end between, step-up transformer B
2B end be connected the 5th power switch pipe T
5Emitter E end and the 6th power switch pipe T
6Collector electrode C end between.Wherein, described is the digital control circuit of core with the microprocessor, control a bridge inverter main circuit dc voltage regulator circuit and adjust the output voltage size as required rapidly, and can press certain frequency period variation with the waveform (as sinusoidal form, exponential form etc.) of particular form by digital control as requested output voltage.Wherein, bridge type inverse dc voltage regulator circuit of described digital control circuit control, wherein the fixed pulsewidth pattern of frequently modulating is adopted in closed loop feedback control, and control algolithm adopts digital increments formula pid algorithm.Wherein, bridge type inverse dc voltage regulator circuit of described digital control circuit control, wherein the basis of digital P WM closed loop control system is to utilize microprocessor to generate 180 ° of phase phasic differences and the adjustable both-end pwm signal of pulsewidth, the method that described digital control circuit generates both-end PWM is direct hysteresis method, this method need be used two timer resources of microprocessor, two timers are provided with identical, start simultaneously, just the initial value of second timer is than more than half cycle of initial value of first timer; The pulsewidth of modulation both-end pwm signal only need be changed the value of comparand register.Wherein, described is the digital control circuit of core with the microprocessor, adopts the frequency and the dutycycle of the interchange output of the digital control secondary bridge inverter main circuit of digital control circuit.Wherein, described digital control circuit control secondary bridge inverter main circuit produces the frequency of both-end pwm signal at f at digital control circuit
MinStill adopt aforementioned direct hysteresis method in the time of between～the 40kHz; The frequency that produces the both-end pwm signal is at 0～f
MinBetween after (low frequency both-end pwm signal) Shi Zexu counts register count cycle and comparison match number of times, take corresponding operating again.Wherein: output rating is 5～100kVA, and rectangular-wave alternating-current voltage output voltage is adjustable continuously between 100V～40kV, and frequency is adjustable continuously between 0Hz～40kHz, and pulsewidth is adjustable continuously between 0～49%.
The advantage of the digital control secondary contravariant of the utility model high-pressure frequency-conversion dewatering power supply for rectangular-wave alternating-current crude oil device is: (1) is compared with the crude oil dehydration electric power that adopts an inverter structure, the efficient height, in light weight, the voltage-regulation performance is good; (2) inversion direct current regulating circuits and secondary inverter circuit all adopt the Digital PWM control mode, and circuit structure is simple, and is easy to maintenance; (3) the both-end PWM that utilizes digital signal processor (DSP) to produce compares with simulation PWM integrated chip, frequency and pulsewidth stability are high, the positive-negative half-cycle ON time is strict in the one-period equates, has suppressed the generation of inverter circuit transformer and step-up transformer bias phenomenon to a certain extent; (4) after secondary contravariant dewatering power supply for rectangular-wave alternating-current crude oil adopts Digital Control, be easy to gather the parameter such as water ratio, density, pressure, temperature of dehydrated crude oil, according to certain mathematical model dehydration voltage, pulsewidth and frequency are carried out complexity control, further improve dehydration production efficiency; (5) because main power circuit adopts secondary inverter structure and control mode to adopt digital control, output power of power supply is 5～100kVA, rectangular-wave alternating-current voltage output voltage is adjustable continuously between 100V～40kV, and frequency is adjustable continuously between 0Hz～40kHz, and pulsewidth is adjustable continuously between 0～49%.
Description of drawings
Fig. 1 is the synoptic diagram of crude oil electric dewatering process
Fig. 2 is for adopting the inversion type crude oil dehydration electric power structural representation of an inverter structure
Fig. 3 is the structured flowchart of the digital control secondary contravariant of the utility model high-pressure frequency-conversion dewatering power supply for rectangular-wave alternating-current crude oil circuit
Fig. 4 is that direct hysteresis method produces f
MinThe synoptic diagram of～40kHz both-end PWM process
Fig. 5 produces low frequency (0～f for microprocessor
Min) main program flow chart of both-end pwm signal
Fig. 6 produces the timer cycle interruption service procedure figure of low frequency both-end pwm signal for microprocessor
Fig. 7 compares the break in service schema for the timer that microprocessor produces low frequency both-end pwm signal
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Referring to shown in Figure 3, digital control secondary contravariant high-pressure frequency-conversion dewatering power supply for rectangular-wave alternating-current crude oil device described in the utility model is that the digital control circuit of core is formed by current rectifying and wave filtering circuit, bridge type inverse dc voltage regulator circuit, secondary bridge inverter main circuit, step-up transformer and with the microprocessor.In the utility model, a described current rectifying and wave filtering circuit is made of rectifier bridge MD, filter capacitor C.A described bridge type inverse dc voltage regulator circuit is by bridge inverter main circuit, the first transformer B
1, the first diode D
1, the second diode D
2, the first afterflow inductance L
1, the 3rd capacitor C
3, first voltage sensor, first driving circuit, the first closed loop pwm control circuit form.Being connected to of its each terminal: the U end of three-phase or single phase alternating current, V end, W end are connected with 1 end, 2 ends, 3 ends of rectifier circuit MD respectively, be parallel with filter capacitor C between 4 ends of rectifier circuit and 5 ends, 4 ends of rectifier circuit MD are connected to the first power switch pipe T
1Collector electrode C, 5 ends of rectifier circuit MD are connected to the second power switch pipe T
2Emitter E; Inverter circuit adopts full-bridge or half-bridge inversion circuit topological framework, the first power switch pipe T
1The emitter E and the second power switch pipe T
2Collector electrode C link to each other; The first power switch pipe T
1Collector electrode C through first capacitor C
1After be connected the first transformer B
1A end, the second power switch pipe T
2Emitter E through second capacitor C
2After be connected the first transformer B
1A end; The first transformer B
1B end be connected the first power switch pipe T
1Emitter E and second switch pipe T
2Collector electrode C between; The first transformer B
1C end through the first diode D
1The back and the first afterflow inductance L
11 end connect the first transformer B
1D end through the second diode D
2The back and the first afterflow inductance L
11 end connect; The first afterflow inductance L
12 ends and the 3rd capacitor C
31 end link to each other the first transformer B
1E end and the 3rd capacitor C
32 ends link to each other and the 3rd capacitor C
3Also there is first voltage sensor at two ends; The 3rd capacitor C that first voltage sensor will collect
3The voltage V at two ends
f(i.e. the output voltage of inverter circuit output voltage or secondary inverter circuit) feeds back to a PWM closed control circuit, the feedback voltage signal V of first closed control circuit to receiving
fWith give determining voltage signal V
gCarry out the relatively back closed-loop control of difference and export first pwm pulse, described first pulse acts on the first power switch pipe T respectively behind first driving circuit
1The grid G and the second power switch pipe T
2Grid G on.
In the utility model, described secondary inverter circuit is by the 3rd power switch pipe T
3, the 4th power switch pipe T
4, the 5th power switch pipe T
5, the 6th power switch pipe T
6Form.The positive pole of aforementioned inversion direct current pressure-control circuit output (is the afterflow inductance L
12 ends or the 3rd capacitor C
31 end) respectively with the 3rd power switch pipe T
3Collector electrode C end, the 5th power switch T
5Collector electrode C end link to each other; The negative pole of aforementioned inversion direct current pressure-control circuit output (the i.e. first transformer B
1E end and the 3rd capacitor C
32 ends) respectively with the 4th power switch T
4Emitter E end, the 6th power switch T
6The emitter E end link to each other; The 3rd power switch pipe T
3Emitter E end and the 4th power switch pipe T
4Collector electrode C end link to each other the 5th power switch pipe T
5Emitter E end and the 6th power switch pipe T
6Collector electrode C end link to each other; Step-up transformer B
2A end be connected the 3rd power switch pipe T
3Emitter E end and the 4th power switch pipe T
4Collector electrode C end between, step-up transformer B
2B end be connected the 5th power switch pipe T
5Emitter E end and the 6th power switch pipe T
6Collector electrode C end between; Step-up transformer B
2C end and D hold two electrodes that connect electric dewatering apparatus for crude oil respectively.
The utility model adopts the principle of work of digital control secondary contravariant high-pressure frequency-conversion dewatering power supply for rectangular-wave alternating-current crude oil device to be: one time the bridge type inverse dc voltage regulator circuit obtains controlled volts DS output, and volts DS is controlled by a PWM closed control circuit; After the secondary bridge inverter main circuit carries out inversion to volts DS, after step-up transformer boosts, obtain the output of all controlled high-pressure frequency-conversion rectangular-wave alternating-current voltage of frequency, voltage, pulsewidth, connect on the battery lead plate of electric dewatering apparatus for crude oil and provide electric energy to crude oil emulsion; The voltage of rectangular-wave alternating-current power supply is regulated by a PWM closed control circuit; The frequency of rectangular-wave alternating-current power supply, pulsewidth are regulated by second pwm control circuit.
The output voltage range of a bridge type inverse dc voltage regulator circuit of the utility model is 0.5～500V.
The voltage-regulation scope that the frequency conversion rectangular-wave alternating-current power supply that the utility model provides to electric dewatering apparatus for crude oil is exported is between 100V～40kV, and the regulation range of frequency is 0Hz～40kHz, and the regulation range of pulsewidth is 0～49%.
A PWM closed control circuit described in the utility model is core with the microprocessor, and the fixed pulsewidth pattern of frequently modulating is adopted in the constant voltage closed loop feedback control of a bridge type inverse dc voltage regulator circuit, and control algolithm adopts digital increments formula pid algorithm.Utilize microprocessor to generate 180 ° of phase phasic differences and the adjustable both-end pwm signal of pulsewidth based on the digital P WM closed loop control system of microprocessor.The utility model uses the method that generates both-end PWM to can be described as direct hysteresis method, this method need be used two timer resources of microprocessor, two timers are provided with identical and startup simultaneously, and just the initial value of second timer is than more than half cycle of initial value of first timer.Directly the hysteresis method can generate the both-end PWM of 180 ° of phase phasic differences easily.For the timer resource of the microprocessor that has PWM specific function delivery port, generally all have comparand register and period register, and comparand register and period register has automatic heavy cartridges function.If the cycle of both-end pwm signal shown in Figure 4 is T, the positive frequency range of every road pwm signal is T
ON, the counting incoming frequency of timing microprocessor device resource is f
CpuThen the calculation formula of period register value TxPR is TxPR=T * f
Cpu-1, the calculation formula of comparand register value is TxCMPR=TxPR-T
ON* f
Cpu, the timer initial value that produces first pwm signal is 0, the timer initial value that produces second pwm signal is TxIni=T * f
Cpu/ 21.The concrete production process of both-end PWM as shown in Figure 4, the pulsewidth of modulation both-end pwm signal only need be changed the value of comparand register.
Aforementioned direct hysteresis method can produce the low-limit frequency f of both-end pwm signal
Min=f
Cpu/ TxPRMax, wherein TxPRMax is the maximum count value of this timing microprocessor device register.Therefore, the utility model second pwm control circuit produces the frequency of both-end pwm signal at f
MinStill adopt aforementioned direct hysteresis method in the time of between～the 40kHz; The frequency that produces the both-end pwm signal is at 0～f
MinBetween after (low frequency both-end pwm signal) Shi Zexu counts register count cycle and comparison match number of times, take corresponding operating again.If the cycle of both-end pwm signal is T, then the total count value of semi-period correspondence is TxPRSum=f
Cpu* T/2, needing total cycle life of counting is TxPRTime=TxPRSum/TxPRMax, the count value in last cycle is TxPRLast=TxPRSum TxPRTime * TxPRMax.If the dutycycle of both-end pwm signal is D, then total comparative figure is TxCMPSum=TxPRSum * D, total comparison match number of times is TxCMPTime=TxCMPSum/TxPRMax, and the count value of comparand register is TxCMPRS=TxCMPSum-TxPRMax * TxCMPTime.Microprocessor produces 0～f
MinBetween low frequency both-end pwm signal the time, main program flow is as shown in Figure 5.Utilize variable TxPRCur to characterize the count cycle number at current place, the program circuit of timer cycle interruption service as shown in Figure 6.Timer compares the interrupt service routine flow process as shown in Figure 7.
It should be noted that at last: above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those skilled in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (7)
1. a digital control secondary contravariant high-pressure frequency-conversion rectangular-wave alternating-current supply unit that is used for dehydrating of crude oil is characterized in that: comprise current rectifying and wave filtering circuit, be used for that single-phase or three-phase alternating current are carried out rectifying and wave-filtering and handle, obtain volts DS output; A bridge type inverse dc voltage regulator circuit is connected with described current rectifying and wave filtering circuit, is used for that described volts DS is carried out high-frequency inversion and handles, and by the duty ratio modulation rectification, the big I of output voltage is the volts DS of quick adjustment as required; The secondary bridge inverter main circuit, be connected with a described bridge type inverse dc voltage regulator circuit, be used for volts DS to described quick adjustment and carry out inversion and handle, by frequency and duty ratio modulation, the voltage of alternating current that all can regulate as required to the former limit of step-up transformer output amplitude, frequency and dutycycle; Step-up transformer is connected with described secondary bridge inverter main circuit, and being used for the aforementioned voltage of alternating current in the former limit of transformer is elevated to is enough to produce effectively coalescent degree of particle water; With the microprocessor is the digital control circuit of core, is used for producing the digital PWM control signal according to demand for control, controls bridge type inverse dc voltage regulator circuit and secondary bridge inverter main circuit.
2. supply unit according to claim 1 is characterized in that: described current rectifying and wave filtering circuit is made of rectifier circuit MD, filter capacitor C; Being connected to of described its each terminal of current rectifying and wave filtering circuit: the U end of three-phase or single phase alternating current, V end, W end are connected with 1 end, 2 ends, 3 ends of rectifier circuit MD respectively, are parallel with filter capacitor C between 4 ends of rectifier circuit MD and 5 ends.
3. supply unit according to claim 1 is characterized in that: a described bridge type inverse dc voltage regulator circuit is by bridge inverter main circuit, the first transformer B
1, the first diode D
1, the second diode D
2, the first afterflow inductance L
1, the 3rd capacitor C
3, first voltage sensor, first driving circuit, the first closed loop pwm control circuit form; Being connected to of described each terminal of bridge type inverse dc voltage regulator circuit: 4 ends of rectifier circuit MD are connected to the first power switch pipe T
1Collector electrode C, 5 ends of rectifier circuit MD are connected to the second power switch pipe T
2Emitter E; Inverter circuit adopts full-bridge or half-bridge inversion circuit topological framework, the first power switch pipe T
1The emitter E and the second power switch pipe T
2Collector electrode C link to each other; The first power switch pipe T
1Collector electrode C through first capacitor C
1After be connected the first transformer B
1A end, the second power switch pipe T
2Emitter E through second capacitor C
2After be connected the first transformer B
1A end; The first transformer B
1B end be connected the first power switch pipe T
1Emitter E and second switch pipe T
2Collector electrode C between; The first transformer B
1C end through the first diode D
1The back and the first afterflow inductance L
11 end connect the first transformer B
1D end through the second diode D
2The back and the first afterflow inductance L
11 end connect; The first afterflow inductance L
12 ends and the 3rd capacitor C
31 end link to each other the first transformer B
1E end and the 3rd capacitor C
32 ends link to each other and the 3rd capacitor C
3Also there is first voltage sensor at two ends; The 3rd capacitor C that first voltage sensor will collect
3The voltage V at two ends
f(i.e. the output voltage of inverter circuit output voltage or secondary inverter circuit) feeds back to a PWM closed control circuit, the feedback voltage signal V of a PWM closed control circuit to receiving
fWith give determining voltage signal V
gCarry out the relatively back closed-loop control of difference and export first pwm pulse, described first pulse acts on the first power switch pipe T respectively behind first driving circuit
1The grid G and the second power switch pipe T
2Grid G on.
4. supply unit according to claim 1 is characterized in that: described secondary bridge inverter main circuit, and by the 3rd power switch pipe T
3, the 4th power switch pipe T
4, the 5th power switch pipe T
5, the 6th power switch pipe T
6Form being connected to of described each terminal of secondary bridge inverter main circuit: the positive pole of aforementioned inversion direct current pressure-control circuit output (is the afterflow inductance L
12 ends or the 3rd capacitor C
31 end) respectively with the 3rd power switch pipe T
3Collector electrode C end, the 5th power switch T
5Collector electrode C end link to each other; The negative pole of aforementioned inversion direct current pressure-control circuit output (the i.e. first transformer B
1E end and the 3rd capacitor C
32 ends) respectively with the 4th power switch T
4Emitter E end, the 6th power switch T
6The emitter E end link to each other; The 3rd power switch pipe T
3Emitter E end and the 4th power switch pipe T
4Collector electrode C end link to each other the 5th power switch pipe T
5Emitter E end and the 6th power switch pipe T
6Collector electrode C end link to each other; Step-up transformer B
2A end be connected the 3rd power switch pipe T
3Emitter E end and the 4th power switch pipe T
4Collector electrode C end between, step-up transformer B
2B end be connected the 5th power switch pipe T
5Emitter E end and the 6th power switch pipe T
6Collector electrode C end between.
5. supply unit according to claim 1 is characterized in that: bridge type inverse dc voltage regulator circuit of described digital control circuit control, wherein the fixed pulsewidth pattern of frequently modulating is adopted in closed loop feedback control.
6. supply unit according to claim 1, it is characterized in that: bridge type inverse dc voltage regulator circuit of described digital control circuit control, wherein the basis of digital P WM closed loop control system is to utilize microprocessor to generate 180 ° of phase phasic differences and the adjustable both-end pwm signal of pulsewidth.
7. supply unit according to claim 1, it is characterized in that: output rating is 5～100kVA, rectangular-wave alternating-current voltage output voltage is adjustable continuously between 100V～40kV, and frequency is adjustable continuously between 0Hz～40kHz, and pulsewidth is adjustable continuously between 0～49%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202925124U CN201648318U (en) | 2009-12-11 | 2009-12-11 | All-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device for crude oil dehydration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202925124U CN201648318U (en) | 2009-12-11 | 2009-12-11 | All-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device for crude oil dehydration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201648318U true CN201648318U (en) | 2010-11-24 |
Family
ID=43113547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202925124U Expired - Fee Related CN201648318U (en) | 2009-12-11 | 2009-12-11 | All-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device for crude oil dehydration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201648318U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769390A (en) * | 2012-07-27 | 2012-11-07 | 无锡蓝天电子有限公司 | Power regul power supply |
| CN102876355A (en) * | 2012-10-30 | 2013-01-16 | 兰州正邦自动化成套设备有限公司 | Digitalized crude oil electric-dehydration control system and control method |
| CN103178743A (en) * | 2013-04-10 | 2013-06-26 | 浙江大学 | Double-boosting high-voltage pulse power supply |
| CN103872929A (en) * | 2012-12-18 | 2014-06-18 | 中国石油天然气股份有限公司 | Three-phase input single-phase output electric desalting power supply |
| CN107852084A (en) * | 2015-07-14 | 2018-03-27 | 瑞典爱立信有限公司 | Switch mode power compensates loop |
| CN110492775A (en) * | 2019-07-18 | 2019-11-22 | 浙江连成环保科技有限公司 | A kind of high powered plasma power supply |
| CN113179029A (en) * | 2021-05-28 | 2021-07-27 | 北京石油化工学院 | High-voltage variable-frequency rectangular alternating-current pulse crude oil electric dehydration power supply device based on DC/DC voltage regulation |
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2009
- 2009-12-11 CN CN2009202925124U patent/CN201648318U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769390A (en) * | 2012-07-27 | 2012-11-07 | 无锡蓝天电子有限公司 | Power regul power supply |
| CN102876355A (en) * | 2012-10-30 | 2013-01-16 | 兰州正邦自动化成套设备有限公司 | Digitalized crude oil electric-dehydration control system and control method |
| CN102876355B (en) * | 2012-10-30 | 2015-03-25 | 兰州正邦自动化成套设备有限公司 | Digitalized crude oil electric-dehydration control system and control method |
| CN103872929A (en) * | 2012-12-18 | 2014-06-18 | 中国石油天然气股份有限公司 | Three-phase input single-phase output electric desalting power supply |
| CN103178743A (en) * | 2013-04-10 | 2013-06-26 | 浙江大学 | Double-boosting high-voltage pulse power supply |
| CN103178743B (en) * | 2013-04-10 | 2015-06-10 | 浙江大学 | Double-boosting high-voltage pulse power supply |
| CN107852084A (en) * | 2015-07-14 | 2018-03-27 | 瑞典爱立信有限公司 | Switch mode power compensates loop |
| CN107852084B (en) * | 2015-07-14 | 2020-07-28 | 瑞典爱立信有限公司 | Switch type power supply compensation loop |
| CN110492775A (en) * | 2019-07-18 | 2019-11-22 | 浙江连成环保科技有限公司 | A kind of high powered plasma power supply |
| CN113179029A (en) * | 2021-05-28 | 2021-07-27 | 北京石油化工学院 | High-voltage variable-frequency rectangular alternating-current pulse crude oil electric dehydration power supply device based on DC/DC voltage regulation |
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Granted publication date: 20101124 Termination date: 20171211 |