CN114726289A - Power supply - Google Patents
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- CN114726289A CN114726289A CN202210400606.9A CN202210400606A CN114726289A CN 114726289 A CN114726289 A CN 114726289A CN 202210400606 A CN202210400606 A CN 202210400606A CN 114726289 A CN114726289 A CN 114726289A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
Abstract
The embodiment of the application relates to the technical field of power supplies, and discloses a power supply, is applied to the two-phase alternating current motor of the wall of a well coring device of the geological evaluation tester in ocean oil field, power supply includes: the high-frequency alternating current power supply comprises a full-bridge rectifier, a high-frequency inverter electrically connected with the full-bridge rectifier, a high-frequency sine wave filter electrically connected with the high-frequency inverter, and a transformer module electrically connected with the high-frequency sine wave filter and the two-phase alternating current motor. The scheme can ensure that the power supply voltage output by the power supply of the double-phase alternating current motor has good electromagnetic compatibility.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to a power supply.
Background
The borehole wall coring device of the geological evaluation tester of the marine oil field is one of the important devices for logging of the marine oil field, and the main function of the borehole wall coring device is to sample and analyze marine geological rock layers. In the process of oil exploration, a stratum solid rock sample is obtained, lithology and oil-containing property observation can be visually carried out, lithology, electrical property, physical property and oil-containing property analysis and assay can be directly carried out, reservoir parameters such as saturation, porosity, permeability and the like are obtained, and analysis and identification of the reservoir are facilitated. However, many oil fields have entered the middle and later stages of the exploitation stage, the reservoir stratum of exploration becomes increasingly complex and hidden, the difficulty of exploration is increasing, and the difficulty of exploitation is greater, so in oil exploration and development, the borehole wall coring device needs to be continuously adapted to the environment with high complexity and high exploration difficulty. In order to adapt to the increasingly high temperature environment, a driving device of the well wall coring device is realized by a two-phase alternating current motor, and the well wall coring device sequentially fixes and swings a hollow drill bit to enable the hollow drill bit to be vertical to a well wall, drives the hollow drill bit to rotate, drives the hollow drill bit to drill a stratum, breaks off a rock core after drilling in place, withdraws the drill bit and the rock core, and pushes the core. When core pushing is carried out, the well wall coring device can monitor whether the core is harvested or not in real time, the length of the obtained core can be measured, and then a spacer is inserted to distinguish cores of different depths.
The power supply of the two-phase alternating current motor of the sidewall coring device is arranged on the ground or an ocean platform, and the two-phase alternating current motor is driven by a transmission cable with the length of about 7000m (well depth). The rated power of the double-phase alternating current motor is 1.5kW, and the phase voltage rated value of the double-phase alternating current motor is 600V alternating current. Since the well depth is 7000m or more, the line loss of the supply voltage is not negligible, and the estimated dc impedance value is about 240 Ω. The power supply voltage of the double-phase alternating current motor with higher voltage level cannot form strong interference on the measurement and control signals and influence the reliability of signal transmission, namely, the power supply voltage output by the power supply of the double-phase alternating current motor has good electromagnetic compatibility on various measurement and control signals.
Therefore, how to enable the supply voltage output by the power supply of the double-phase alternating current motor to have good electromagnetic compatibility becomes a technical problem to be solved urgently at present.
Disclosure of Invention
In view of the above disadvantages in the prior art, embodiments of the present invention provide a power supply, which can effectively solve the technical problem in the prior art that how to make the supply voltage output by the power supply of a dual-phase ac motor have good electromagnetic compatibility.
According to a first aspect of the embodiments of the present invention, there is provided a power supply applied to a dual-phase ac motor of a borehole wall coring apparatus of a geological evaluation tester for a marine oil field, the power supply including: the high-frequency alternating current power supply comprises a full-bridge rectifier, a high-frequency inverter electrically connected with the full-bridge rectifier, a high-frequency sine wave filter electrically connected with the high-frequency inverter, and a transformer module electrically connected with the high-frequency sine wave filter and the two-phase alternating current power supply; the full-bridge rectifier is used for converting three-phase alternating voltage in a power grid to obtain direct current voltage corresponding to the three-phase alternating voltage in the power grid; the high-frequency inverter is used for carrying out frequency conversion adjustment on direct-current voltage corresponding to the three-phase alternating-current voltage in the power grid so as to obtain high-frequency three-phase alternating-current voltage; the high-frequency sine wave filter is used for performing sine wave filtering on the voltage waveform of the high-frequency three-phase alternating voltage to obtain the three-phase alternating voltage of which the voltage waveform is a sine wave and the phase difference is 120 degrees; and the transformer module is used for respectively boosting the line voltage and the phase voltage in the three-phase alternating-current voltage with the voltage waveform being sine wave and the phase difference being 120 degrees, so as to obtain two paths of alternating-current voltages with the phase difference being 90 degrees, and respectively outputting the two paths of alternating-current voltages to two windings of the double-phase alternating-current motor, so as to drive the double-phase alternating-current motor to operate.
Optionally, the full bridge rectifier comprises: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode; a cathode of the first diode, a cathode of the second diode, and a cathode of the third diode are electrically connected to each other, an anode of the fourth diode, an anode of the fifth diode, and an anode of the sixth diode are electrically connected to each other, and a cathode of the fourth diode is electrically connected to an anode of the first diode, a cathode of the fifth diode is electrically connected to an anode of the second diode, and a cathode of the sixth diode is electrically connected to an anode of the third diode.
Optionally, an access terminal of a first phase voltage of the three-phase alternating-current voltages in the grid is electrically connected to an anode of the first diode and a cathode of the fourth diode, respectively, an access terminal of a second phase voltage of the three-phase alternating-current voltages in the grid is electrically connected to an anode of the second diode and a cathode of the fifth diode, respectively, and an access terminal of a third phase voltage of the three-phase alternating-current voltages in the grid is electrically connected to an anode of the third diode and a cathode of the sixth diode, respectively.
Optionally, the power supply further comprises: and a first end of the filter capacitor is electrically connected with a cathode of the first diode, a cathode of the second diode and a cathode of the third diode respectively, a second end of the filter capacitor is electrically connected with an anode of the fourth diode, an anode of the fifth diode and an anode of the sixth diode respectively, and the filter capacitor is used for filtering direct-current voltage corresponding to three-phase alternating-current voltage in the power grid to obtain filtered direct-current voltage.
Optionally, the high frequency inverter comprises: the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor, the fourth insulated gate bipolar transistor, the fifth insulated gate bipolar transistor, the sixth insulated gate bipolar transistor, the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode; a collector electrode of the first insulated gate bipolar transistor, a collector electrode of the third insulated gate bipolar transistor and a collector electrode of the fifth insulated gate bipolar transistor are electrically connected with each other, and the collector electrode of the first insulated gate bipolar transistor, the collector electrode of the third insulated gate bipolar transistor and the collector electrode of the fifth insulated gate bipolar transistor are respectively and electrically connected with the first end of the filter capacitor; an emitter electrode of the second insulated gate bipolar transistor, an emitter electrode of the fourth insulated gate bipolar transistor and an emitter electrode of the sixth insulated gate bipolar transistor are electrically connected with each other, and the emitter electrode of the second insulated gate bipolar transistor, the emitter electrode of the fourth insulated gate bipolar transistor and the emitter electrode of the sixth insulated gate bipolar transistor are respectively and electrically connected with the second end of the filter capacitor; an emitter electrode of the first insulated gate bipolar transistor is electrically connected with a collector electrode of the second insulated gate bipolar transistor, an emitter electrode of the third insulated gate bipolar transistor is electrically connected with a collector electrode of the fourth insulated gate bipolar transistor, and an emitter electrode of the fifth insulated gate bipolar transistor is electrically connected with a collector electrode of the sixth insulated gate bipolar transistor; the anode of the first diode is electrically connected with the emitter of the first insulated gate bipolar transistor, the cathode of the first diode is electrically connected with the collector of the first insulated gate bipolar transistor, the anode of the second diode is electrically connected with the emitter of the second insulated gate bipolar transistor, the cathode of the second diode is electrically connected with the collector of the second insulated gate bipolar transistor, the anode of the third diode is electrically connected with the emitter of the third insulated gate bipolar transistor, the cathode of the third diode is electrically connected with the collector of the third insulated gate bipolar transistor, the anode of the fourth diode is electrically connected with the emitter of the fourth insulated gate bipolar transistor, the cathode of the fourth diode is electrically connected with the collector of the fourth insulated gate bipolar transistor, and the anode of the fifth diode is electrically connected with the emitter of the fifth insulated gate bipolar transistor, the negative electrode of the fifth diode is electrically connected with the collector electrode of the fifth insulated gate bipolar transistor, the positive electrode of the sixth diode is electrically connected with the emitter electrode of the sixth insulated gate bipolar transistor, and the negative electrode of the sixth diode is electrically connected with the collector electrode of the sixth insulated gate bipolar transistor.
Optionally, the high frequency sine wave filter includes: the first inductor, the second inductor, the third inductor, the first capacitor, the second capacitor and the third capacitor; the first end of the first inductor is electrically connected with the emitter electrode of the fifth insulated gate bipolar transistor and the collector electrode of the sixth insulated gate bipolar transistor respectively, the first end of the second inductor is electrically connected with the emitter electrode of the third insulated gate bipolar transistor and the collector electrode of the fourth insulated gate bipolar transistor respectively, and the first end of the third inductor is electrically connected with the emitter electrode of the first insulated gate bipolar transistor and the collector electrode of the second insulated gate bipolar transistor respectively; the second end of the first inductor is electrically connected with the first end of the first capacitor, the second end of the first capacitor is electrically connected with the second end of the second capacitor and the second end of the third capacitor respectively, the first end of the second capacitor is electrically connected with the second end of the first inductor and the second end of the second inductor respectively, and the first end of the third capacitor is electrically connected with the second end of the third inductor.
Optionally, the transformer module includes: the first transformer is used for boosting the line voltage in the three-phase alternating-current voltage with the voltage waveform being a sine wave and the phase difference being 120 degrees to obtain a first alternating-current voltage, and outputting the first alternating-current voltage to one winding of the two-phase alternating-current motor so as to drive the two-phase alternating-current motor to operate; and the second transformer is used for boosting the phase voltage in the three-phase alternating-current voltage with the voltage waveform being a sine wave and the phase difference being 120 degrees, so as to obtain a second alternating-current voltage, and outputting the second alternating-current voltage to the other winding of the double-phase alternating-current motor, so as to drive the double-phase alternating-current motor to operate, wherein the first alternating-current voltage and the second alternating-current voltage are 90 degrees different in phase from each other.
The embodiment of the invention provides a power supply, wherein a full-bridge rectifier included in the power supply converts three-phase alternating voltages in a power grid to obtain direct voltages corresponding to the three-phase alternating voltages in the power grid, a high-frequency inverter included in the power supply performs frequency conversion adjustment on the direct voltages corresponding to the three-phase alternating voltages in the power grid to obtain high-frequency three-phase alternating voltages, a high-frequency sine wave filter included in the power supply performs sine wave filtering on voltage waveforms of the high-frequency three-phase alternating voltages to obtain three-phase alternating voltages with sine waves and phases with 120 degrees different from each other, a transformer module respectively boosts line voltages and phase voltages in the three-phase alternating voltages with sine waves and phases with 120 degrees different from each other to obtain two-path alternating voltages with 90 degrees different from each other, and respectively output to the two windings of the double-phase alternating current motor so as to drive the double-phase alternating current motor to operate. Compare with other current modes, it is right to adopt high frequency inverter the direct current voltage that three-phase alternating voltage in the electric wire netting corresponds carries out frequency conversion and adjusts, and it is right to adopt high frequency sine wave filter the voltage waveform of the three-phase alternating voltage of high frequency carries out sine wave filtering, can obtain the voltage waveform and be sinusoidal three-phase alternating voltage, and then the voltage waveform of the alternating voltage that differs 90 degrees on the two way phases that finally obtain is sinusoidal, because the supply voltage of two-phase alternating current motor is sinusoidal wave, and harmonic content is low, can make the supply voltage of two-phase alternating current motor's power supply output have fine electromagnetic compatibility, do not form strong interference to the various observing and controlling signals that same cable conductor nevertheless belongs to different cable cores, influence signal transmission's reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a prior art power supply for a dual phase AC motor for use in a sidewall coring apparatus;
FIG. 2 is a schematic diagram of a prior art power supply for a dual phase AC motor for use in a sidewall coring apparatus;
FIG. 3 is a schematic structural diagram of a power supply of a two-phase AC motor applied to a sidewall coring device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a full-bridge rectifier according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a vector relationship between an input voltage and an output voltage of a transformer module according to an embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.
The prior art provides two circuit modes for supplying power to a two-phase alternating current motor.
The first mode is a voltage regulator plus transformer linear power supply mode, which is a typical linear power supply mode, and there is one voltage regulator and two transformers added on the input side. The voltage regulator is used for regulating the power supply voltage to overcome loss and voltage drop of a transmission line and meet the rated power supply voltage of the double-phase alternating current motor, as shown in fig. 1. However, the method is complex in control of the dual-phase alternating current motor, various measurement and control signals are arranged in the same cable (but different cable cores) with the power supply voltage, and the method is poor in anti-jamming capability.
In the second mode, an uncontrolled rectifier, a single-phase high-frequency inverter, a high-frequency transformer, a high-frequency rectifier, a three-phase inverter and an LC filtering system are adopted. As shown in FIG. 2, the mode consists of two groups of AC/DC/AC converters, each of which consists of IGBT power devices, the previous-stage AC/DC/AC converter can be called as a low-voltage side converter, and realizes the conversion of input AC110V/50Hz (power frequency) alternating voltage from DC130V to AC110V/20kHz (high frequency) alternating voltage; the latter stage AC/DC/AC converter can be called a medium voltage side converter, and realizes the conversion of input AC110V/20kHz (high frequency) alternating voltage to AC1200V/50Hz (power frequency) alternating voltage through DC 2700V. The intermediate link realizes electrical isolation and boost conversion by a high-frequency transformer, and realizes high-frequency boost conversion from AC110V/20kHz to AC2400V/20 kHz. However, the method still has the defects that the control of the two-phase alternating current motor is complex, various measurement and control signals are arranged in the same cable (but different cable cores) with the power supply voltage, and the interference resistance of the method is weak.
Therefore, the technical problem of how to enable the supply voltage output by the power supply of the double-phase alternating current motor to have good electromagnetic compatibility still exists in the prior art.
In order to solve the technical problem that how to enable the supply voltage output by the power supply of the dual-phase alternating current motor to have good electromagnetic compatibility still exists in the prior art, as shown in fig. 3, an embodiment of the present invention provides a power supply, where the power supply is applied to a dual-phase alternating current motor 50 of a borehole wall coring device of a geological evaluation tester in an offshore oil field, and the power supply includes: a full bridge rectifier 10, a high frequency inverter 20 electrically connected to the full bridge rectifier 10, a high frequency sine wave filter 30 electrically connected to the high frequency inverter 20, and a transformer module 40 electrically connected to the high frequency sine wave filter 30 and the two-phase ac motor 50; the full-bridge rectifier 10 is configured to convert a three-phase alternating voltage in a power grid to obtain a direct-current voltage corresponding to the three-phase alternating voltage in the power grid; the high-frequency inverter 20 is configured to perform frequency conversion adjustment on a direct-current voltage corresponding to a three-phase alternating-current voltage in the power grid to obtain a high-frequency three-phase alternating-current voltage; the high-frequency sine wave filter 30 is configured to perform sine wave filtering on the voltage waveform of the high-frequency three-phase ac voltage to obtain a three-phase ac voltage whose voltage waveform is a sine wave and whose phase difference is 120 degrees; the transformer module 40 is configured to boost the line voltage and the phase voltage in the three-phase ac voltage having the sinusoidal voltage waveform and a phase difference of 120 degrees in phase, respectively, to obtain two paths of ac voltages having a phase difference of 90 degrees in phase, and respectively output the two paths of ac voltages to two windings of the dual-phase ac motor 50, so as to drive the dual-phase ac motor 50 to operate. Therefore, the high-frequency inverter is used for carrying out frequency conversion adjustment on the direct-current voltage corresponding to the three-phase alternating-current voltage in the power grid, the high-frequency sine wave filter is used for carrying out sine wave filtering on the voltage waveform of the high-frequency three-phase alternating-current voltage, the three-phase alternating-current voltage with the sine wave voltage waveform can be obtained, and the finally obtained voltage waveforms of the alternating-current voltages with the 90-degree difference on the two phases are the sine wave. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In some alternative embodiments, as shown in fig. 4, the full-bridge rectifier 10 includes: a first diode 11, a second diode 12, a third diode 13, a fourth diode 14, a fifth diode 15, and a sixth diode 16; a cathode of the first diode 11, a cathode of the second diode 12, and a cathode of the third diode 13 are electrically connected to each other, an anode of the fourth diode 14, an anode of the fifth diode 15, and an anode of the sixth diode 16 are electrically connected to each other, and a cathode of the fourth diode 14 is electrically connected to an anode of the first diode 11, a cathode of the fifth diode 15 is electrically connected to an anode of the second diode 12, and a cathode of the sixth diode 16 is electrically connected to an anode of the third diode 13. Therefore, the three-phase alternating voltage in the power grid can be effectively converted, and the direct-current voltage corresponding to the three-phase alternating voltage in the power grid is obtained. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In some optional embodiments, an access a of a first phase voltage of the three-phase alternating voltages in the grid is electrically connected to the anode of the first diode 11 and the cathode of the fourth diode 14, respectively, an access B of a second phase voltage of the three-phase alternating voltages in the grid is electrically connected to the anode of the second diode 12 and the cathode of the fifth diode 15, respectively, and an access C of a third phase voltage of the three-phase alternating voltages in the grid is electrically connected to the anode of the third diode 13 and the cathode of the sixth diode 16, respectively. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In some optional embodiments, the power supply further comprises: a first end of the filter capacitor is electrically connected to a cathode of the first diode 11, a cathode of the second diode 12, and a cathode of the third diode 13, and a second end of the filter capacitor is electrically connected to an anode of the fourth diode 14, an anode of the fifth diode 15, and an anode of the sixth diode 16, respectively, and the filter capacitor is configured to filter a dc voltage corresponding to a three-phase ac voltage in the power grid to obtain a filtered dc voltage. Therefore, the direct-current voltage corresponding to the three-phase alternating-current voltage in the power grid can be effectively filtered, and the direct-current voltage corresponding to the three-phase alternating-current voltage in the power grid is denoised. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In some optional embodiments, the high frequency inverter 20 includes: a first insulated gate bipolar transistor 21, a second insulated gate bipolar transistor 22, a third insulated gate bipolar transistor 23, a fourth insulated gate bipolar transistor 24, a fifth insulated gate bipolar transistor 25, a sixth insulated gate bipolar transistor 26, a first diode 27, a second diode 30, a third diode 28, a fourth diode 31, a fifth diode 29, and a sixth diode 32; the collector electrode of the first insulated gate bipolar transistor 21, the collector electrode of the third insulated gate bipolar transistor 23 and the collector electrode of the fifth insulated gate bipolar transistor 25 are electrically connected with each other, and the collector electrode of the first insulated gate bipolar transistor 21, the collector electrode of the third insulated gate bipolar transistor 23 and the collector electrode of the fifth insulated gate bipolar transistor 25 are respectively electrically connected with the first end of the filter capacitor; the emitter of the second insulated gate bipolar transistor 22, the emitter of the fourth insulated gate bipolar transistor 24 and the emitter of the sixth insulated gate bipolar transistor 26 are electrically connected with each other, and the emitter of the second insulated gate bipolar transistor 22, the emitter of the fourth insulated gate bipolar transistor 24 and the emitter of the sixth insulated gate bipolar transistor 26 are respectively and electrically connected with the second end of the filter capacitor; the emitter of the first insulated gate bipolar transistor 21 is electrically connected with the collector of the second insulated gate bipolar transistor 22, the emitter of the third insulated gate bipolar transistor 23 is electrically connected with the collector of the fourth insulated gate bipolar transistor 24, and the emitter of the fifth insulated gate bipolar transistor 25 is electrically connected with the collector of the sixth insulated gate bipolar transistor 26; the anode of the first diode 27 is electrically connected to the emitter of the first igbt 21, the cathode of the first diode 27 is electrically connected to the collector of the first igbt 21, the anode of the second diode 30 is electrically connected to the emitter of the second igbt 22, the cathode of the second diode 30 is electrically connected to the collector of the second igbt 22, the anode of the third diode 28 is electrically connected to the emitter of the third igbt 23, the cathode of the third diode 28 is electrically connected to the collector of the third igbt 23, the anode of the fourth diode 31 is electrically connected to the emitter of the fourth igbt 24, and the cathode of the fourth diode 31 is electrically connected to the collector of the fourth igbt 24, the anode of the fifth diode 29 is electrically connected to the emitter of the fifth insulated gate bipolar transistor 25, the cathode of the fifth diode 29 is electrically connected to the collector of the fifth insulated gate bipolar transistor 25, the anode of the sixth diode 32 is electrically connected to the emitter of the sixth insulated gate bipolar transistor 26, and the cathode of the sixth diode 32 is electrically connected to the collector of the sixth insulated gate bipolar transistor 26. Therefore, the direct-current voltage corresponding to the three-phase alternating-current voltage in the power grid can be effectively subjected to frequency conversion adjustment, and the high-frequency three-phase alternating-current voltage is obtained. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In some optional embodiments, the high frequency sine wave filter comprises: a first inductor 33, a second inductor 34, a third inductor 35, a first capacitor 36, a second capacitor 37 and a third capacitor 38; a first end of the first inductor 33 is electrically connected to an emitter of the fifth igbt 25 and a collector of the sixth igbt 26, respectively, a first end of the second inductor 34 is electrically connected to an emitter of the third igbt 23 and a collector of the fourth igbt 24, respectively, and a first end of the third inductor 35 is electrically connected to an emitter of the first igbt 21 and a collector of the second igbt 22, respectively; a second end of the first inductor 33 is electrically connected to a first end of the first capacitor 36, a second end of the first capacitor 36 is electrically connected to a second end of the second capacitor 37 and a second end of the third capacitor 38, respectively, a first end of the second capacitor 37 is electrically connected to a second end of the first inductor 33 and a second end of the second inductor 34, respectively, and a first end of the third capacitor 38 is electrically connected to a second end of the third inductor 35. Thereby, the voltage waveform of the high-frequency three-phase ac voltage can be effectively subjected to sine wave filtering, and a three-phase ac voltage having a sine wave voltage waveform and a phase difference of 120 degrees can be obtained. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In a specific example, as shown in fig. 3, after voltage transformation, there is a long cable line, and the core inside the long cable is 7 cores, which include a communication line and a power supply line, and the adjustment frequency of the communication line is below 100KHz, in order to ensure that the communication line has strong anti-interference capability and stable communication when the equipment supplies power, a high-frequency inverter 20 and a high-frequency sine wave filter 30 are used, and the switching frequency of the SiC high-frequency inverter is selected from 120KHz to 200 KHz and adjusted according to actual conditions. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In some optional embodiments, the transformer module 40 includes: a first transformer 41, configured to boost a line voltage in a three-phase alternating-current voltage whose voltage waveform is a sine wave and whose phases are different by 120 degrees, to obtain a first alternating-current voltage, and output the first alternating-current voltage to one winding of the dual-phase alternating-current motor 50, so as to drive the dual-phase alternating-current motor 50 to operate; and a second transformer 42, configured to boost a phase voltage of a three-phase alternating-current voltage, of which the voltage waveform is a sine wave and of which the phases are different by 120 degrees, to obtain a second alternating-current voltage, and output the second alternating-current voltage to another winding of the dual-phase alternating-current motor 50, so as to drive the dual-phase alternating-current motor 50 to operate, where the phases of the first alternating-current voltage and the second alternating-current voltage are different by 90 degrees. Therefore, the line voltage and the phase voltage in the three-phase alternating voltage with the voltage waveform being sine wave and the phase difference being 120 degrees can be effectively boosted respectively, and the two-path alternating voltage with the phase difference being 90 degrees can be obtained. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In a specific example, as shown in fig. 5, before transformation, the three-phase voltage vector a, the three-phase voltage vector B and the three-phase voltage vector C are different from each other by 120 degrees, and the line voltage U among the three-phase voltages is takenABAnd phase voltage UCOAnd boosting the voltage by using a first transformer and a second transformer respectively. After boosting, U's are obtained which differ from each other by 90 deg. as in FIG. 5abAnd UcoThe two-way alternating voltage drives the two-phase alternating current motor to operate. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
In a specific example, after current in a power grid passes through a full-bridge rectifier, the frequency and voltage output to a two-phase alternating current motor are adjusted through frequency conversion by using a SIC high-frequency inverter, then alternating current power supplies with a mutual difference of 120 degrees are obtained through a high-frequency sine wave filter, and finally adjustable output voltages with an alternating current of 0-1200V with a mutual difference of 90 degrees are obtained through a first transformer and a second transformer respectively, so that the two-phase alternating current motor is driven to operate. It should be understood that the above description is only exemplary, and the embodiments of the present application are not limited in this respect.
The power supply provided by the embodiment of the application adopts ground power supply, and is different from the traditional power supply mode that the power supply is in power supply in a shaft wall pipe at the shaft bottom, so that the severe working condition of the power supply is changed, and the ground power supply can be monitored and maintained in real time.
The embodiment of the application provides a power supply integrating power electronic technology and intelligent control, and has the advantages of ingenious design, effective control, high intelligent degree, capability of regulating voltage through frequency conversion of a high-frequency inverter, safety in use, energy conservation, environmental friendliness and the like. Compared with the prior art, the power supply provided by the embodiment of the application has the advantages that the high-frequency and intelligent technology is applied, the function of 90-degree adjustable power supply voltage difference on two paths of phases is realized, and the power supply has the characteristics of small size, high efficiency, strong anti-interference capability and the like, so that the operation efficiency and reliability of the motor can be improved, the transportation and maintenance of equipment can be ensured, and the capacity and level of oil field geological survey are improved effectively.
In the above embodiments, the description of each embodiment has its own emphasis, and for parts not described in detail in a certain embodiment, reference may be made to the description of other embodiments. In the above description, for a person skilled in the art, there are variations on the specific implementation and application range according to the idea of the embodiment of the present invention, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A power supply characterized by a two-phase ac motor (50) for a sidewall coring apparatus of a geological evaluation tester applied to a marine oil field, the power supply comprising:
a full-bridge rectifier (10), a high-frequency inverter (20) electrically connected to the full-bridge rectifier (10), a high-frequency sine wave filter (30) electrically connected to the high-frequency inverter (20), and a transformer module (40) electrically connected to the high-frequency sine wave filter (30) and the two-phase AC motor (50);
the full-bridge rectifier (10) is used for converting three-phase alternating voltage in a power grid to obtain direct current voltage corresponding to the three-phase alternating voltage in the power grid;
the high-frequency inverter (20) is used for carrying out frequency conversion adjustment on direct-current voltages corresponding to three-phase alternating-current voltages in the power grid so as to obtain high-frequency three-phase alternating-current voltages;
the high-frequency sine wave filter (30) is used for performing sine wave filtering on the voltage waveform of the high-frequency three-phase alternating voltage to obtain the three-phase alternating voltage of which the voltage waveform is a sine wave and the phases are 120 degrees different from each other;
the transformer module (40) is used for respectively boosting the line voltage and the phase voltage in the three-phase alternating-current voltage with the voltage waveform being sine wave and the phase difference being 120 degrees, so as to obtain two-path alternating-current voltage with the phase difference being 90 degrees, and respectively outputting the two-path alternating-current voltage to the two windings of the double-phase alternating-current motor (50), so as to drive the double-phase alternating-current motor (50) to operate.
2. Power supply source according to claim 1, characterized in that said full-bridge rectifier (10) comprises:
a first diode (11), a second diode (12), a third diode (13), a fourth diode (14), a fifth diode (15), and a sixth diode (16);
the cathode of the first diode (11), the cathode of the second diode (12) and the cathode of the third diode (13) are electrically connected to each other, the anode of the fourth diode (14), the anode of the fifth diode (15) and the anode of the sixth diode (16) are electrically connected to each other, and the cathode of the fourth diode (14) is electrically connected to the anode of the first diode (11), the cathode of the fifth diode (15) is electrically connected to the anode of the second diode (12), and the cathode of the sixth diode (16) is electrically connected to the anode of the third diode (13).
3. The electrical power supply according to claim 2, characterized in that an access terminal of a first phase voltage of the three-phase alternating voltage in the electrical grid is electrically connected with the anode of the first diode (11) and the cathode of the fourth diode (14), respectively, an access terminal of a second phase voltage of the three-phase alternating voltage in the electrical grid is electrically connected with the anode of the second diode (12) and the cathode of the fifth diode (15), respectively, and an access terminal of a third phase voltage of the three-phase alternating voltage in the electrical grid is electrically connected with the anode of the third diode (13) and the cathode of the sixth diode (16), respectively.
4. The power supply according to claim 2, characterized in that the power supply further comprises:
a first end of the filter capacitor is respectively connected with a cathode of the first diode (11), a cathode of the second diode (12) and a cathode of the third diode (13), a second end of the filter capacitor is respectively electrically connected with an anode of the fourth diode (14), an anode of the fifth diode (15) and an anode of the sixth diode (16), and the filter capacitor is used for filtering direct-current voltages corresponding to three-phase alternating-current voltages in the power grid to obtain filtered direct-current voltages.
5. Power supply source according to claim 4, characterized in that said high-frequency inverter (20) comprises:
a first insulated gate bipolar transistor (21), a second insulated gate bipolar transistor (22), a third insulated gate bipolar transistor (23), a fourth insulated gate bipolar transistor (24), a fifth insulated gate bipolar transistor (25), a sixth insulated gate bipolar transistor (26), a first diode (27), a second diode (30), a third diode (28), a fourth diode (31), a fifth diode (29), and a sixth diode (32);
a collector electrode of the first insulated gate bipolar transistor (21), a collector electrode of the third insulated gate bipolar transistor (23) and a collector electrode of the fifth insulated gate bipolar transistor (25) are electrically connected with each other, and the collector electrode of the first insulated gate bipolar transistor (21), the collector electrode of the third insulated gate bipolar transistor (23) and the collector electrode of the fifth insulated gate bipolar transistor (25) are respectively and electrically connected with a first end of the filter capacitor;
the emitter of the second insulated gate bipolar transistor (22), the emitter of the fourth insulated gate bipolar transistor (24) and the emitter of the sixth insulated gate bipolar transistor (26) are electrically connected with each other, and the emitter of the second insulated gate bipolar transistor (22), the emitter of the fourth insulated gate bipolar transistor (24) and the emitter of the sixth insulated gate bipolar transistor (26) are respectively and electrically connected with the second end of the filter capacitor;
the emitter of the first insulated gate bipolar transistor (21) is electrically connected with the collector of the second insulated gate bipolar transistor (22), the emitter of the third insulated gate bipolar transistor (23) is electrically connected with the collector of the fourth insulated gate bipolar transistor (24), and the emitter of the fifth insulated gate bipolar transistor (25) is electrically connected with the collector of the sixth insulated gate bipolar transistor (26);
the anode of the first diode (27) is electrically connected with the emitter of the first insulated gate bipolar transistor (21), the cathode of the first diode (27) is electrically connected with the collector of the first insulated gate bipolar transistor (21), the anode of the second diode (30) is electrically connected with the emitter of the second insulated gate bipolar transistor (22), the cathode of the second diode (30) is electrically connected with the collector of the second insulated gate bipolar transistor (22), the anode of the third diode (28) is electrically connected with the emitter of the third insulated gate bipolar transistor (23), the cathode of the third diode (28) is electrically connected with the collector of the third insulated gate bipolar transistor (23), and the anode of the fourth diode (31) is electrically connected with the emitter of the fourth insulated gate bipolar transistor (24), the negative electrode of the fourth diode (31) is electrically connected with the collector electrode of the fourth insulated gate bipolar transistor (24), the positive electrode of the fifth diode (29) is electrically connected with the emitter electrode of the fifth insulated gate bipolar transistor (25), the negative electrode of the fifth diode (29) is electrically connected with the collector electrode of the fifth insulated gate bipolar transistor (25), the positive electrode of the sixth diode (32) is electrically connected with the emitter electrode of the sixth insulated gate bipolar transistor (26), and the negative electrode of the sixth diode (32) is electrically connected with the collector electrode of the sixth insulated gate bipolar transistor (26).
6. The power supply of claim 5, wherein the high frequency sine wave filter comprises:
a first inductor (33), a second inductor (34), a third inductor (35), a first capacitor (36), a second capacitor (37) and a third capacitor (38);
a first end of the first inductor (33) is electrically connected with an emitter of the fifth insulated gate bipolar transistor (25) and a collector of the sixth insulated gate bipolar transistor (26), a first end of the second inductor (34) is electrically connected with an emitter of the third insulated gate bipolar transistor (23) and a collector of the fourth insulated gate bipolar transistor (24), and a first end of the third inductor (35) is electrically connected with an emitter of the first insulated gate bipolar transistor (21) and a collector of the second insulated gate bipolar transistor (22);
the second end of the first inductor (33) is electrically connected with the first end of the first capacitor (36), the second end of the first capacitor (36) is electrically connected with the second end of the second capacitor (37) and the second end of the third capacitor (38), the first end of the second capacitor (37) is electrically connected with the second end of the first inductor (33) and the second end of the second inductor (34), and the first end of the third capacitor (38) is electrically connected with the second end of the third inductor (35).
7. Power supply source according to claim 6, characterized in that said transformer module (40) comprises:
the first transformer (41) is used for boosting the line voltage in the three-phase alternating-current voltage with the voltage waveform being a sine wave and the phase difference being 120 degrees so as to obtain a first alternating-current voltage, and outputting the first alternating-current voltage to one winding of the double-phase alternating-current motor (50) so as to drive the double-phase alternating-current motor (50) to operate;
and the second transformer (42) is used for boosting the phase voltage in the three-phase alternating-current voltage with the voltage waveform being a sine wave and the phase difference being 120 degrees, so as to obtain a second alternating-current voltage, and outputting the second alternating-current voltage to the other winding of the double-phase alternating-current motor (50) so as to drive the double-phase alternating-current motor (50) to operate, wherein the first alternating-current voltage and the second alternating-current voltage are 90 degrees different in phase from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210400606.9A CN114726289A (en) | 2022-04-17 | 2022-04-17 | Power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210400606.9A CN114726289A (en) | 2022-04-17 | 2022-04-17 | Power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114726289A true CN114726289A (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210400606.9A Pending CN114726289A (en) | 2022-04-17 | 2022-04-17 | Power supply |
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| Country | Link |
|---|---|
| CN (1) | CN114726289A (en) |
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2022
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