CN112886902A - Common bus variable frequency speed regulation explosion-proof control system of oil extraction circulation slurry high-speed centrifuge - Google Patents
Common bus variable frequency speed regulation explosion-proof control system of oil extraction circulation slurry high-speed centrifuge Download PDFInfo
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- CN112886902A CN112886902A CN202110228669.6A CN202110228669A CN112886902A CN 112886902 A CN112886902 A CN 112886902A CN 202110228669 A CN202110228669 A CN 202110228669A CN 112886902 A CN112886902 A CN 112886902A
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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
- H02P27/08—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 with pulse width modulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
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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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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Abstract
The invention provides a common-bus variable-frequency speed-regulating explosion-proof control system of an oil extraction circulating slurry high-speed centrifuge. According to the technical scheme, when the speed of the main machine of the two frequency converters and the auxiliary machine form slip, the auxiliary machine and the main machine are mutually related through a slurry medium, an auxiliary machine motor is in a regeneration power generation state, and generated regenerated electric energy is transmitted to a direct current side filter capacitor to generate overvoltage. The invention effectively improves the application of the common direct current bus of the explosion-proof frequency converter, and better solves the problem of overvoltage protection shutdown of the auxiliary machine of the explosion-proof frequency converter of the drilling solid control centrifuge. Meanwhile, the IGBTs of the VVVF main frequency converter and the VVVF auxiliary frequency converter are arranged on a copper plate which is 25 mm behind the explosion-proof shell, a heat dissipation air duct and a heat dissipation fan are arranged on the back of the copper plate, and the heat dissipation fan continuously operates until the temperature meets the operation requirements of the VVVVF main frequency converter and the VVVF auxiliary frequency converter. The invention effectively solves the technical problem of taking heat dissipation and explosion prevention into consideration.
Description
Technical Field
The invention relates to the technical field of explosion-proof control systems, in particular to a common-bus variable-frequency speed-regulating explosion-proof control system of an oil extraction circulating slurry high-speed centrifuge.
Background
The explosion-proof variable frequency speed-regulating centrifugal machine is an advanced large-throughput drilling corollary equipment newly developed in China. Has a plurality of excellent performances in the aspect of meeting the requirements of the drilling process. The centrifuge is operated by the same machine of the main machine and the auxiliary machine by two frequency converters, when the speed of the main machine of the centrifuge and the auxiliary machine form slip, the auxiliary machine and the main machine are mutually associated through a slurry medium to form dragging, an electric motor of the auxiliary machine is in a regeneration power generation state, and generated regenerated electric energy is transmitted to a filter capacitor on a direct current side to generate overvoltage. The switch device and the electrolytic capacitor can be damaged, and even the insulation of the motor can be damaged, so that the safe operation of the centrifugal machine is threatened. Therefore, this part of the regenerated energy must be processed, and the general methods for processing the regenerated energy include energy consumption and energy feedback.
The energy consumption is that a discharge resistance unit component is added on the direct current side of the frequency converter, and the regenerated electric energy is consumed on a power resistor through a special energy consumption braking circuit and is converted into heat energy.
The invention researches the overvoltage formed by the auxiliary motor in the regeneration and power generation state when the rotating drum speed of the centrifuge and the auxiliary machine form slip, adopts the technology of direct current common bus of two frequency converters, the energy of the auxiliary motor in the regeneration and power generation state is utilized by the main motor, the overvoltage shutdown accident is avoided, the closed-loop automatic control is realized, and the invention is the organic combination of the new electromechanical integration technology and petroleum drilling machinery, in particular to an indispensable solid control equipment explosion-proof control device of a medium-deep well, a side well and a directional well.
The invention provides a scheme of a common bus of an explosion-proof variable-frequency direct-current common bus speed regulation control system of an oil field drilling solid-control high-speed centrifuge. The principle of direct current common bus is based on the principle that the universal frequency conversion devices adopt an alternating current-direct current-alternating current frequency mode, when a motor is in a braking state, the braking energy is fed back to a direct current side, and in order to better process the feedback braking energy, the direct current sides of the two frequency conversion devices are connected. For example, when one transducer is in braking and the other transducer is in accelerating, the energy may be complementary. The auxiliary frequency converter is connected with a direct current bus of the main frequency converter, and the auxiliary frequency converter does not need to be connected with a power grid, so that the external brake resistor of the main frequency converter of the rectification module is not needed.
When the rotating drum speed of the main machine of the centrifuge and the auxiliary machine propeller are mutually related to form slip through a slurry medium, the auxiliary machine motor is in a power generation state, mechanical energy stored in the system is converted into electric energy through the motor, and the electric energy is returned to a direct current loop of the frequency converter through the inverter. At the moment, the inverter is in a rectification state, if no energy consumption measure is taken in the frequency converter, the energy of the energy will cause the voltage of the energy storage capacitor of the intermediate circuit to rise, the direct current bus voltage of the capacitor rises at the moment, when the voltage rises to 680V, the brake unit starts to work, namely, redundant electric energy is fed back to the side of a power grid, the direct current bus voltage of a single frequency converter is maintained below 680V (690V in some cases), and the frequency converter cannot report overvoltage faults.
The shared direct current bus can reduce repeated configuration of the brake unit, and the structure is simple, reasonable and reliable. The intermediate direct-current voltage is constant, and the capacitance parallel energy storage capacity greatly reduces the fluctuation of the power grid. The driving motor works in different states, energy feedback is complementary, and the dynamic characteristic of the system is optimized. The harmonic interference of the main machine and the auxiliary machine frequency converters generated in the power grid can be mutually counteracted, and the harmonic distortion rate of the power grid is reduced.
Disclosure of Invention
The invention aims to overcome the technical defects in the prior art, and provides a common-bus variable-frequency speed-regulating explosion-proof control system of an oil extraction circulating slurry high-speed centrifuge, aiming at solving the technical purpose in the prior art, the invention adopts the following technical scheme:
the system comprises an auxiliary engine controller, an auxiliary engine display, an auxiliary engine interface, a direct current common bus, a rectifier, a reactor, a charging unit, a control power supply, a control transformer, a main engine controller, a main engine display, a main engine interface, an auxiliary engine driver, a resistance-capacitance absorber, an auxiliary engine inverter, an auxiliary engine temperature sensor, an auxiliary engine motor, a main engine inverter, a main engine motor, a main engine temperature sensor and a main engine driver.
Preferably, the main circuit of the system comprises an FR2 thermal relay, a QF circuit breaker, a TZ1 explosion-proof plug-in, a KM3 alternating current contactor, a VVVF main machine frequency converter, an FR1 thermal relay, an FR1 thermal relay, a KM2 alternating current contactor, a KM1 alternating current contactor, a KM4 alternating current contactor, a VVVF auxiliary machine frequency converter, a KM5 alternating current contactor, an FR3 thermal relay, a TZ1 slurry pump motor, a KM6 alternating current contactor, a cooling fan, a BK1 transformer, a KM7 alternating current contactor and an electric heater.
Preferably, the external structure of the system comprises an explosion-proof box flange cover, an auxiliary machine frequency display, a main machine frequency display, a temperature display, a power supply instruction, a power frequency conversion selection, an auxiliary machine power frequency start-stop, a TZ2 explosion-proof plug connector, a main machine rotating speed display, an auxiliary machine rotating speed display, a main machine power frequency start-stop, a main machine frequency conversion start-stop, a main machine rotating speed adjustment, an auxiliary machine frequency conversion start-stop, a heat dissipation air duct, a heat dissipation fan, a support piece, an installation bottom plate, a fixing bolt, a shock absorber and.
Preferably, when the speed of the main machine of the two frequency converters and the speed of the auxiliary machine form slip, the auxiliary machine and the main machine are mutually related through a mud medium, the auxiliary machine motor is in a regeneration power generation state, and generated regenerated electric energy is transmitted to the direct current side filter capacitor to generate overvoltage. The proposal of the common bus is improved, the application of the common DC bus of the explosion-proof frequency converter is effectively improved, and the problem of overvoltage protection shutdown of the auxiliary machine of the explosion-proof frequency converter of the drilling solid control centrifuge is well solved.
Preferably, IGBTs of the VVVF master inverter and the VVVF slave inverter are mounted on a copper plate 25 mm behind the explosion-proof housing, and a heat dissipation air duct and a heat dissipation fan are mounted on the back of the copper plate (according to hydrodynamics and heat transfer convection, radiation and conduction principles), so that a temperature difference (heat transfer phenomenon) exists between the IGBTs of the VVVF master inverter and the VVVF slave inverter and between different parts of the heat sink, and the heat dissipation fan continuously operates until the temperature meets the operation requirements of the VVVF master inverter and the VVVF slave inverter.
Preferably, a cooling fan, a cooling air duct, a BK1 transformer, a KM7 contactor, an electric heater and a host controller are arranged in the control box (so as to ensure the environmental working conditions of the VVVF host frequency converter, the VVVF auxiliary frequency converter and related control elements); the control system monitors the temperature change in the control box, when the temperature is higher than a threshold value, the temperature alarm gives an alarm, the heat dissipation system is started, and when the temperature is lower than minus 10 ℃, the dehumidification heater is started (so as to prevent the influence of condensation on the operation of the VVVF main machine frequency converter, the VVVF main machine frequency converter and electrical elements).
The traditional mode high-speed centrifuge can only adopt one motor to drag, utilizes a differential mechanism to adjust the rotating speed of a main roller and an inner rotor, cannot realize stepless speed regulation, has a small speed regulation range and a poor separation effect. The invention overcomes the defects of the traditional centrifuge mode, and both the frequency converter of the VVVF main machine and the frequency converter of the VVVVF auxiliary machine can realize stepless speed regulation and are convenient to regulate speed. The closed-loop control can be realized by timely adjusting the rotating speed of the VVVF main machine frequency converter and the VVVF auxiliary machine frequency converter and the liquid inlet quantity of the centrifugal machine according to the slurry concentration and the drilling depth, so that the separation effect is optimal. Soft start and soft stop can be realized, and the start is stable. The explosion-proof variable-frequency direct-current common-bus speed regulation control system of the centrifugal machine overcomes the defects that the impact of the traditional centrifugal machine mode on a mechanical device is small, the power supply grid impact is small, and the service life of the mechanical device is prolonged.
When the speed of the main machine of the two frequency converters and the auxiliary machine form slip, the auxiliary machine and the main machine are mutually related through a slurry medium, the auxiliary machine motor is in a regeneration power generation state, and generated regenerated electric energy is transmitted to a direct current side filter capacitor to generate overvoltage.
The invention provides an improvement on a common bus scheme of an explosion-proof frequency conversion direct current common bus speed regulation control system of an oil field drilling solid control high-speed centrifuge, so as to effectively improve the application of the common direct current bus of an explosion-proof frequency converter and better solve the problem of overvoltage protection shutdown of an auxiliary machine of the explosion-proof frequency converter of the drilling solid control centrifuge. The method has a very important meaning for reducing equipment investment, reducing power grid interference and improving equipment utilization rate. The principle of direct current common bus is based on the principle that the universal frequency conversion devices adopt an alternating current-direct current-alternating current frequency mode, when a motor is in a braking state, the braking energy is fed back to a direct current side, and in order to better process the feedback braking energy, the direct current sides of the two frequency conversion devices are connected. One frequency converter is in braking state and the other frequency converter is in accelerating state, so that the energy can be complemented. The auxiliary frequency converter is connected with a direct current bus of the main frequency converter, and the auxiliary frequency converter does not need to be connected with a power grid, so that the control design purpose of externally connecting a brake resistor with the main frequency converter of the rectifier module is not needed.
The invention effectively solves the problems of heat dissipation and explosion prevention. The structure meets the general requirements of GB3836 and 1-2010 electric equipment in explosive gas atmosphere: and (4) explosion-proof type'd'.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a schematic diagram of the main circuit of the present invention;
FIG. 3 is a front view of the outer structure of the present invention;
FIG. 4 is a side view of the outer structure of the present invention;
FIG. 5 is a rear view of the outer structure of the present invention;
in the figure:
1. auxiliary machine controller 2, auxiliary machine display 3, auxiliary machine interface 4, direct current are total to generating line
5. Rectifier 6, reactor 7, charging unit 8, control power supply
9. Control transformer 10, host controller 11, host display 12, host interface
13. Auxiliary machine driver 14, resistance-capacitance absorber 15, auxiliary machine inverter 16, and auxiliary machine temperature sensor
17. Auxiliary machine motor 18, main machine inverter 19, main machine motor 20 and main machine temperature sensor
21. Main motor driver 22, FR2 thermal relay 23, QF circuit breaker 24, TZ1 explosion-proof plug-in
25. KM3 AC contactor 26, VVVF host machine frequency converter 27, FR1 thermal relay 28, KM2 AC contactor
29. KM1 AC contactor 30, KM4 AC contactor 31, VVVF auxiliary machine frequency converter 32, KM5 AC contactor
33. FR3 thermal relay 34, TZ1 slurry supply pump motor 35, KM6 AC contactor 36 and cooling fan
37. BK1 transformer 38, KM7 AC contactor 39, electric heater 40, explosion-proof box flange plate cover
41. Auxiliary frequency display 42, main frequency display 43, temperature display 44, power supply indication
45. Power frequency conversion selection 46, auxiliary machine power frequency selection 47, auxiliary machine power frequency start and stop 48, TZ2 explosion-proof plug connector
49. The main engine rotating speed display 50, the auxiliary engine rotating speed display 51, the main engine power frequency start and stop 52, and the main engine frequency conversion start and stop
53. Main engine speed adjustment 54, auxiliary engine speed adjustment 55, auxiliary engine frequency conversion start and stop 56, and heat dissipation air duct
57. Radiator fan 58, support member 59, mounting base plate 60, fixing bolt
61. Shock absorber 62, emergency stop button.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
As shown in figure 1, the system comprises an auxiliary machine controller 1, an auxiliary machine display 2, an auxiliary machine interface 3, a direct current common bus 4, a rectifier 5, a reactor 6, a charging unit 7, a control power supply 8, a control transformer 9, a main machine controller 10, a main machine display 11, a main machine interface 12, an auxiliary machine driver 13, a resistance-capacitance absorber 14, an auxiliary machine inverter 15, an auxiliary machine temperature sensor 16, an auxiliary machine motor 17, a main machine inverter 18, a main machine motor 19, a main machine temperature sensor 20 and a main machine driver 21.
As shown in fig. 2, the main circuit of the system includes FR2 thermal relay 22, QF breaker 23, TZ1 explosion-proof plug-in 24, KM3 ac contactor 25, VVVF host frequency converter 26, FR1 thermal relay 26, FR1 thermal relay 27, KM2 ac contactor 28, KM1 ac contactor 29, KM4 ac contactor 30, VVVF auxiliary frequency converter 31, KM5 ac contactor 32, FR3 thermal relay 33, TZ1 slurry pump motor 34, KM6 ac contactor 35, heat dissipation fan 36, BK1 transformer 37, KM7 ac contactor 38, and electric heater 39.
As shown in fig. 3 to 5, the external structure of the system includes an explosion-proof box flange cover 40, an auxiliary frequency display 41, a main frequency display 42, a temperature display 43, a power indication 44, a power frequency conversion selection 45, an auxiliary power frequency selection 46, an auxiliary power frequency start-stop 47, a TZ2 explosion-proof plug connector 48, a main rotation speed display 49, an auxiliary rotation speed display 50, a main power frequency start-stop 51, a main frequency conversion start-stop 52, a main rotation speed adjustment 53, an auxiliary rotation speed adjustment 54, an auxiliary frequency conversion start-stop 55, a heat dissipation air duct 56, a heat dissipation fan 57, a support 58, an installation bottom plate 59, a fixing bolt 60, a shock absorber 61 and an emergency stop button 62. And when the frequency converter is electrified, the logic control, transmission fault and load characteristic setting self-checking of the frequency converter are automatically detected.
The main loop is designed to be direct-current and common bus; QF circuit breaker 23 is VVVF host computer converter 26, VVVF auxiliary engine converter 31's inlet wire protection device connects charging unit 7, because converter energy storage capacitance is great, electric capacity both ends voltage is zero when the access power supply, therefore at the last power-on moment the charging current of filter capacitance is very big, rectifier bridge diode can be damaged to too big current, for protecting the rectifier bridge, there is the pre-charge unit to charge before going up the power-on, prevent sharp gained applying a high voltage, the condenser is probably damaged because the temperature rises fast, when charging to the certain extent, will charge the return circuit short circuit by the circuit breaker. The charging unit 7 is also connected with a control transformer 9 to supply power to a control power supply 8, the other end of the charging unit 7 is connected with an input reactor 6 to suppress surge voltage and surge current, protect the frequency converter, prolong the service life of the frequency converter and prevent harmonic interference, and simultaneously, because the frequency converter adopts a frequency conversion mode to regulate the speed, therefore, higher harmonics and waveform distortion are often generated during speed regulation, which can affect the normal use of equipment, therefore, the input end of the speed regulation device is additionally provided with an incoming line reactor, the power factor of the frequency converter can be improved, the harmonic current can be restrained, the harmonic voltage and the harmonic current can be filtered, the quality of a power grid is improved, the power grid is connected with the rectifier 5 and output to the VVVVF main frequency converter 26, the direct-current side smoothing resistance-capacitance absorber 14 of the VVVF auxiliary frequency converter 31 completes the direct-current common bus 4 connection, the VVVF auxiliary frequency converter 31 resistance-capacitance absorber 14 is connected with the auxiliary inverter 15, and the output end of the VVVF auxiliary frequency converter 31 is connected to the 11KW auxiliary motor. The frequency conversion inverter 15 part of the VVVF auxiliary machine frequency converter 31 is of a voltage type alternating current-direct current-alternating frequency topological structure. The power supply is rectified after passing through a contactor and a reactor, then is filtered and stabilized by a power capacitor, and is inverted into alternating current with adjustable frequency and voltage, namely the power supply of the VVVF auxiliary machine frequency converter 31, through an inverter circuit formed by an inverter 15 IGBT. Because the large-scale equipment on the actual working site of the petroleum drilling well is started in a complex environment, the fluctuation of a power grid is often caused and higher harmonics are generated, and the frequency converter rectifier can also be used for increasing the power supply impedance and assisting in absorbing surge voltage generated when nearby equipment is put into operation and voltage spikes of a main power supply to cause the damage of the frequency converter rectifier 5. The VVVF master inverter 26 and the VVVF slave inverter 31 use the incoming line reactor 6 to effectively prevent these factors from affecting the inverters.
Designing a control loop of a VVVF host frequency converter 26; the host controller 10 is the heart that is the frequency conversion part of the VVVF host frequency converter 26, and the processing, control, and command transmission of various information are performed by it. The method collects most real-time signals, generates driving IGBT signals of the VVVF host frequency converter 26 after operation, completes data exchange with a driving unit through optical fibers on one hand, processes various information of the frequency converter on the other hand, sends the processed information to the host display 11 for display, and receives an operation instruction of the host external interface 12 to control the operation of the VVVF host frequency converter 26.
The host driver 21 receives the trigger signal of the IGBT host inverter 18 of the host controller 10, isolates and amplifies the PWM signal, and controls the on and off time of the IGBT host inverter 18 by the transmission signal. Meanwhile, the current, the voltage, the temperature of the main machine temperature sensor 20 and other variable information are preprocessed, and the IGBT main machine inverter 18 can be protected in time.
The host display screen 11 is provided with a high-brightness LED display screen, and can receive and display real-time information sent by the host controller 10. When the VVVF host frequency converter 26 works normally, real-time parameters such as the voltage of the direct current bus 4, the frequency conversion output current, the output power, the rotating speed and the like are displayed, when the VVVF host frequency converter 26 reports a fault and takes a protection action, the host display 11 displays accurate fault information and also displays the voltage of the direct current common bus 4 after the alternating current input by the VVVF host frequency converter 26 is rectified; temperature of the power module: displaying the temperature of the power module of the VVVF host frequency converter 26 part, wherein the abnormal rise of the temperature indicates that the cooling fan 36 has a problem in operation; the current rotating speed of the VVVF host frequency converter 26 is displayed, and the real-time rotating speed per minute of the motor is displayed; the host display 11 displays the output current, displays the current output to the host motor 19 by the VVVF host frequency converter 26, and reflects the load condition; the run time display refers to the total run time of the host motor 19 from the date of operation to the present, providing a reference for the drilling operator. Host display 11 failure display: when the VVVF host converter 26 fails, it becomes failure information and a failure code, respectively.
Designing a control loop of a VVVF auxiliary frequency converter 31; the auxiliary controller 1 is a heart whose frequency is converted by the VVVF auxiliary inverter 31, and processing, control, and transmission of commands of various kinds of information are all performed by the auxiliary controller 1. The auxiliary machine controller 1 collects most of real-time signals, generates driving IGBT signals of the VVVF auxiliary machine frequency converter 31 after operation, completes data exchange with a driving unit through optical fibers on one hand, processes various information of the frequency converter on the other hand, sends the processed information to the auxiliary machine display 2 for display, and receives an operation instruction of the auxiliary machine external interface 3 to control the VVVF main machine frequency converter 31 to operate.
The auxiliary machine driver 13 receives an auxiliary machine inverter 15 trigger IGBT signal of the auxiliary machine controller 1, isolates and amplifies the PWM signal, and controls the on-off time of the IGBT auxiliary machine inverter 15 through a transmission signal. Meanwhile, the current, the voltage, the temperature of the auxiliary machine temperature sensor 16 and other variable information are preprocessed, and the IGBT auxiliary machine inverter 15 can be protected in time.
The auxiliary machine display screen 2 is provided with a high-brightness LED display screen which can receive and display real-time information sent by the main machine controller 1. When the VVVF auxiliary machine frequency converter 31 works normally, real-time parameters such as the voltage of the direct-current common bus 4, the frequency conversion output current, the output power and the rotating speed are displayed, and when the VVVF auxiliary machine frequency converter 31 reports a fault and takes a protection action, the auxiliary machine display 2 displays accurate fault information. Voltage of dc common bus 4: displaying the direct-current voltage after the input alternating current is rectified by the VVVF auxiliary frequency converter 31; temperature of the power module: displaying the temperature of a power module of the VVVF auxiliary machine frequency converter 31 part, wherein the abnormal rise of the temperature indicates that the cooling fan 36 has a problem in operation; the current rotating speed of the VVVF auxiliary machine frequency converter 31 displays the real-time rotating speed per minute of the auxiliary machine motor 17; the auxiliary machine display 2 displays the output current, displays the current output to the auxiliary machine motor 17 by the VVVF auxiliary machine frequency converter 31, and reflects the load condition; the run time display indicates the total run time of the auxiliary motor 17 from the date of operation to the present, providing a reference for the drilling operator. Auxiliary machine display 2 fault display: when the VVVF slave inverter 31 fails, the failure information and the failure code are respectively generated.
Example 2
As shown in figure 1, the system comprises an auxiliary machine controller 1, an auxiliary machine display 2, an auxiliary machine interface 3, a direct current common bus 4, a rectifier 5, a reactor 6, a charging unit 7, a control power supply 8, a control transformer 9, a main machine controller 10, a main machine display 11, a main machine interface 12, an auxiliary machine driver 13, a resistance-capacitance absorber 14, an auxiliary machine inverter 15, an auxiliary machine temperature sensor 16, an auxiliary machine motor 17, a main machine inverter 18, a main machine motor 19, a main machine temperature sensor 20 and a main machine driver 21. The three-phase current inlet wire is connected with a protection reactor through a pre-charging unit, and is connected with a main machine, an auxiliary machine direct-current bus, an explosion-proof frequency conversion device and a power frequency operation device, wherein the frequency, the voltage and the torque of the explosion-proof frequency conversion device can be controlled through inversion after three-phase rectification. The main loop is the backup loop for the system power frequency. Namely, the frequency converter is put into emergency when in fault, and the operation of the solid control equipment is not influenced.
As shown in fig. 2, the main circuit of the system includes FR2 thermal relay 22, QF breaker 23, TZ1 explosion-proof plug-in 24, KM3 ac contactor 25, VVVF host frequency converter 26, FR1 thermal relay 26, FR1 thermal relay 27, KM2 ac contactor 28, KM1 ac contactor 29, KM4 ac contactor 30, VVVF auxiliary frequency converter 31, KM5 ac contactor 32, FR3 thermal relay 33, TZ1 slurry pump motor 34, KM6 ac contactor 35, heat dissipation fan 36, BK1 transformer 37, KM7 ac contactor 38, and electric heater 39.
The alternating current 380V is connected with a main circuit air switch QF in the explosion-proof box through an explosion-proof lead-in device TZ1 to be respectively connected with a host frequency conversion circuit and a power frequency circuit; auxiliary machine frequency conversion and power frequency loop; a pump power frequency loop; cooling fan and heating circuit.
The explosion-proof frequency converter shares the application of the direct current bus, and the problem of overvoltage protection shutdown of an auxiliary machine of the explosion-proof frequency converter of the drilling solid control centrifuge is well solved. The method has a very important meaning for reducing equipment investment, reducing power grid interference and improving equipment utilization rate.
Through the practical application of Daqing oil fields, China oil fields and Shengli oil fields, the starting circuit has the advantages of small starting current, stable starting current, reliable control performance of output torque, small impact on a power grid, and common bus of a main engine and an auxiliary engine, and effectively solves the problems of over-speed regeneration power generation and over-voltage tripping of the auxiliary engine.
As shown in fig. 3 to 5, the external structure of the system includes an explosion-proof box flange cover 40, an auxiliary frequency display 41, a main frequency display 42, a temperature display 43, a power indication 44, a power frequency conversion selection 45, an auxiliary power frequency selection 46, an auxiliary power frequency start-stop 47, a TZ2 explosion-proof plug connector 48, a main rotation speed display 49, an auxiliary rotation speed display 50, a main power frequency start-stop 51, a main frequency conversion start-stop 52, a main rotation speed adjustment 53, an auxiliary rotation speed adjustment 54, an auxiliary frequency conversion start-stop 55, a heat dissipation air duct 56, a heat dissipation fan 57, a support 58, an installation bottom plate 59, a fixing bolt 60, a shock absorber 61 and an emergency stop button 62.
When the system is used outdoors, the relative humidity is 90 percent, the maximum solar radiation intensity is 1120W/m2, and the rainfall intensity is 6mm/min according to the requirements of preventing water and other liquid from invading. The fixed bolt is connected with a shock absorber in a vibration environment. The frequency displays of the main machine and the auxiliary machine observe the running condition, temperature display and power frequency variable frequency selection through the explosion-proof toughened glass; starting and stopping the main machine power frequency; the host machine starts and stops with frequency conversion; adjusting the rotating speed of the host; the explosion-proof type of explosion-proof plug connector installation technology, the execution standard: GB 3836.1-3-2010. The maximum surface temperature of the shell does not exceed 130 ℃.
When the explosion-proof box is designed, key technologies such as the explosion-proof mixture intruding into the interior and the explosion of the external explosion-proof mixture caused by explosion of some reason, the strength of the shell, the gap and the length of the explosion-proof joint surfaces of all parts forming the shell, the limitation on the highest surface temperature of the shell and the like are fully considered, and the explosion-proof performance is ensured. The parameters of the explosion-proof joint surface of the shell and the cover accord with the relevant regulations of GB 3836.2.
The high-speed centrifuge is matched with an explosion-proof VVVF host frequency converter 26 which is arranged on an explosion-proof box flange cover 40, and all electrical elements are required to be arranged according to the national GB3836 standard, and the maximum gap corresponding to the volume of the corresponding shell, which is the explosion-proof joint surface of the static part of the explosion-proof gap between a box door and an explosion-proof box body, an operating lever and a shaft, and the explosion-proof joint surface with a rotating shaft, meets the requirements of the national standard.
When the speed of the main machine of the two frequency converters and the auxiliary machine form slip, the auxiliary machine and the main machine are mutually related through a slurry medium, the auxiliary machine motor is in a regeneration power generation state, and generated regenerated electric energy is transmitted to the direct current side filter capacitor to generate overvoltage.
The IGBTs of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31 are mounted on a copper plate 25 mm behind the explosion-proof housing, and a heat dissipation air duct 56 and a heat dissipation fan 57 are mounted on the back surface of the copper plate, and a temperature difference exists between the IGBTs of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31 and between different parts of a heat sink, and the heat dissipation fan 57 continuously operates until the temperature meets the operation requirements of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31.
The control box is internally provided with a cooling fan 57, a cooling air duct 56, a BK1 transformer 37, a KM7 contactor 38, an electric heater 39 and a host controller 10; the control system monitors the temperature change in the control box, when the temperature is higher than a threshold value, the temperature alarm gives an alarm, the heat dissipation system is started, and when the temperature is lower than minus 10 ℃, the dehumidification heater is started.
The system configuration of the present invention is further described below with reference to FIG. 1:
the mud tank possesses various functions, and according to hydrodynamics and finite element analysis theory, the mud tank conveying process is designed to comprise a linear vibrating screen, a vacuum degasser, a desander, a deslimitor, a sand pump, a shear pump, a submerged slurry pump, a stirrer and the like, wherein a high-speed centrifuge is mud purification equipment and is used for removing solid phase content in mud and maintaining the excellent and good guarantee of the mud, and the excellent mud performance is used for preventing drilling underground accidents, protecting a production zone, improving the drilling speed and reducing the cost. Therefore, the quality of the service performance of the solid control system and the like directly influences the construction quality of the drilling machine.
Designing a system diagram into parts; a main circuit direct current common bus, a VVVF main frequency converter 26 control circuit and a VVVF auxiliary frequency converter 31 control circuit.
Designing a main loop direct current common bus; QF circuit breaker 23 is that charging unit 7 is connected to the inlet wire protection device of VVVF host computer converter 26VVVF auxiliary machine converter 31, because converter energy storage capacitance is great, electric capacity both ends voltage is zero when the access power supply, therefore at the last power-on moment the charging current of filter capacitance is very big, rectifier bridge diode can be damaged to too big current, for protecting the rectifier bridge, there is the pre-charge unit to charge before going up, prevent sharp gained applying a high voltage, the condenser is probably damaged because the temperature rises fast, when charging to the certain degree, will charge the return circuit short circuit by the circuit breaker. The charging unit 7 is also connected with a control transformer 9 to supply power to a control power supply 8, the other end of the charging unit 7 is connected with an input reactor 6 to suppress surge voltage and surge current, protect the frequency converter, prolong the service life of the frequency converter and prevent harmonic interference, and simultaneously, because the frequency converter adopts a frequency conversion mode to regulate the speed, so can produce higher harmonic often in the time of the speed governing and produce wave form distortion, can influence equipment normal use, for this reason, this patent installs an inlet wire reactor 6 additional at the input design, the power factor of converter has been improved and harmonic current has been restrained, filtering harmonic voltage and harmonic current, improve electric wire netting quality and connect rectifier 5 output and accomplish direct current common bus 4 to VVVF host computer converter 26VVVF auxiliary machine converter 31 direct current side flat wave resistance-capacitance absorber 14 and connect, VVVVF auxiliary machine converter 31 resistance-capacitance absorber 14 is connected with auxiliary machine inverter 15, its output is to 11KW auxiliary machine motor 17. The frequency conversion inverter 15 part of the VVVF auxiliary machine frequency converter 31 is of a voltage type alternating current-direct current-alternating frequency topological structure. The power supply is rectified after passing through a contactor and a reactor, then is filtered and stabilized by a power capacitor, and is inverted into alternating current with adjustable frequency and voltage, namely the power supply of the VVVF auxiliary machine frequency converter 31, through an inverter circuit formed by an inverter 15 IGBT. The complex environment of large equipment starting at the actual working site of the oil drilling well often causes the fluctuation of a power grid and generates higher harmonics. It can also be used to increase the power supply impedance and to help absorb surge voltages and voltage spikes of the main power supply that occur when nearby equipment is put into operation, resulting in maintenance of the rectifier 5 of the frequency converter. The VVVF master inverter 26 and the VVVF slave inverter 31 use the incoming line reactor 6 to effectively prevent these factors from affecting the inverters.
Designing a control loop of a VVVF host frequency converter 26; the host controller 10 is the heart that is the frequency conversion part of the VVVF host frequency converter 26, and the processing, control, and command transmission of various information are performed by it. The method collects most real-time signals, generates driving IGBT signals of the VVVF host frequency converter 26 after operation, completes data exchange with a driving unit through optical fibers on one hand, processes various information of the frequency converter on the other hand, sends the processed information to the host display 11 for display, and receives an operation instruction of the host external interface 12 to control the operation of the VVVF host frequency converter 26.
The host driver 21 receives the host inverter 18 of the host controller 10 to trigger the IGBT signal, and isolates and amplifies the PWM signal, and controls the on and off time of the IGBT host inverter 18 by the transmission signal. Meanwhile, the current, the voltage, the temperature of the host temperature sensor 20 and other variable information are preprocessed, and the host inverter 18IGBT can be protected in time.
The host display screen 11 is provided with a high-brightness LED display screen, and can receive and display real-time information sent by the host controller 10. When the VVVF host frequency converter 26 works normally, real-time parameters such as the voltage of the dc bus 4, the frequency conversion output current, the output power, and the rotation speed are displayed, and when the VVVF host frequency converter 26 reports a fault and takes a protection action, the host display 11 accurately displays the fault information. Voltage of dc common bus 4: displaying the direct-current voltage after the input alternating current rectification of the VVVF host frequency converter 26; temperature of the power module: displaying the temperature of the power module of the VVVF host frequency converter 26 part, wherein the abnormal rise of the temperature indicates that the cooling fan 36 has a problem in operation; the current rotation speed of the VVVF host frequency converter 26 is displayed, and the real-time rotation speed of the motor represents every minute; the host display 11 displays the output current, displays the current output to the host motor 19 by the VVVF host frequency converter 26, and reflects the load condition; the run time display refers to the total run time of the host motor 19 from the date of operation to the present, providing a reference for the drilling operator. Host display 11 failure display: when the VVVF host converter 26 fails, it becomes failure information and a failure code, respectively.
Designing a control loop of a VVVF auxiliary frequency converter 31; the auxiliary controller 1 is a heart whose frequency is converted by the VVVF auxiliary inverter 31, and processing, control, and transmission of commands of various kinds of information are all performed by the auxiliary controller 1. The auxiliary machine controller 1 collects most of real-time signals, generates driving IGBT signals of the VVVF auxiliary machine frequency converter 31 after operation, completes data exchange with a driving unit through optical fibers on one hand, processes various information of the frequency converter on the other hand, sends the processed information to the auxiliary machine display 2 for display, and receives an operation instruction of the auxiliary machine external interface 3 to control the VVVF main machine frequency converter 31 to operate.
The auxiliary machine driver 13 receives the main machine inverter 15 of the auxiliary machine controller 1 to trigger the IGBT signal, isolates and amplifies the PWM signal, and controls the on-off time of the IGBT auxiliary machine inverter 15 through a transmission signal. Meanwhile, the current, the voltage, the temperature of the auxiliary machine temperature sensor 16 and other variable information are preprocessed, and the IGBT auxiliary machine inverter 15 can be protected in time.
The auxiliary machine display screen 2 is provided with a high-brightness LED display screen which can receive and display real-time information sent by the main machine controller 10. When the VVVF auxiliary machine frequency converter 31 works normally, real-time parameters such as the voltage of the direct-current common bus 4, the frequency conversion output current, the output power and the rotating speed are displayed, and when the VVVF auxiliary machine frequency converter 31 reports a fault and takes a protection action, the auxiliary machine display 2 displays accurate fault information. Voltage of dc common bus 4: displaying the direct-current voltage after the input alternating current is rectified by the VVVF auxiliary frequency converter 31; temperature of the power module: displaying the temperature of a power module of the VVVF auxiliary machine frequency converter 31 part, wherein the abnormal rise of the temperature indicates that the cooling fan 36 has a problem in operation; the current rotating speed of the VVVF auxiliary machine frequency converter 31 displays the real-time rotating speed per minute of the auxiliary machine motor 17; the auxiliary machine display 2 displays the output current, displays the current output to the auxiliary machine motor 17 by the VVVF auxiliary machine frequency converter 31, and reflects the load condition; the run time display indicates the total run time of the auxiliary motor 17 from the date of operation to the present, providing a reference for the drilling operator. Auxiliary machine display 2 fault display: when the VVVF slave inverter 31 fails, the failure information and the failure code are respectively generated.
The main circuit of the present invention is further described below with reference to fig. 2:
the reliability of the explosion-proof electrical appliance is a very critical problem, and the mechanical and electrical elements of the explosion-proof electrical appliance can be damaged by vibration, moisture, outdoor operation and temperature change. Meanwhile, maintenance cost is brought, and great threat is caused to safety.
The QF circuit breaker 23 is an incoming line protection device of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31, and the KM1 ac contactor 29 to the KM2 ac contactor 19 are loop contactors of the master motor for frequency conversion operation and power frequency operation. The KM3 AC contactor 25-FR 2 thermal relay 22 is connected with the KM4 AC contactor 30 and is an electric contactor for the variable-frequency operation and the power-frequency operation of an auxiliary machine motor, and when the system is abnormal in operation, a worker can press the emergency stop button 62 to check the abnormal condition.
The invention discloses application of a frequency converter drive 21 of a common direct-current bus 4 to a high-speed centrifuge, which better solves the problem that when a frequency converter 31 of a VVVF auxiliary machine is accelerated and another frequency converter 26 of the VVVVF auxiliary machine is rotated poorly, the overvoltage shutdown phenomenon of the frequency converter 26 of the VVVF auxiliary machine is reduced, the interference frequency of the common direct-current bus 4 to a power grid is reduced, and the power quality of the power grid is improved. The method has a particularly important meaning in the aspects of reducing equipment investment, increasing equipment utilization rate and saving energy.
The external structure of the present invention will be further described with reference to the accompanying drawings 3 to 5:
the mounting bottom plate 59 of the supporting piece 58 of the heat dissipation air duct 56 of the flange plate cover 40 of the explosion-proof box of the shell of the control system device is formed by welding high-quality steel plates, and polyurethane ship paint is sprayed after the surface of metal is subjected to sand blasting treatment, so that the explosion-proof box has the characteristics of high strength and corrosion resistance. The explosion-proof box is composed of a wiring cavity of the TZ1 explosion-proof plug-in 24, a main VVVF host frequency converter 26 and a main VVVF auxiliary frequency converter 31. A power switch and control elements of each loop electric appliance are arranged in the main cavity, and an operating mechanism of the switch and a knob controlled by a change-over switch are arranged on the box cover and comprise an auxiliary machine frequency display 41 explosion-proof observation hole; host frequency display 42 viewport; temperature display 43 observation hole; a power frequency and frequency conversion selection 44 change-over switch; a main machine power frequency start-stop 45 change-over switch; a main machine frequency conversion start-stop 46 change-over switch; the main machine speed adjustment 47 switches the switch. The shell wiring cavity and the TZ2 explosion-proof connector 48 are fastened by stainless steel bolts, the explosion-proof box flange plate cover 40 and the explosion-proof box are connected by a novel hinge and fastened by high-strength stainless steel bolts, and the explosion-proof box is connected with the rubber shock absorber 61 by the fixing bolt 60. The wiring cavity of the control device is provided with the aluminum alloy TZ1 explosion-proof plug 24 explosion-proof quick connection plug, and the circuit separation is quick and convenient when the equipment is carried. The explosion-proof introduction mode of the power cable of the VVVF main frequency converter 26 and the VVVF auxiliary frequency converter 31 is that an explosion-proof plug-in 24 socket is introduced through a cable connector, a cable connector plug of the explosion-proof plug-in 24 which is matched and connected is prepared in advance, the rated current of the explosion-proof plug-in 24 of an inlet wire TZ1 is 200A, the main machine 100A, the auxiliary machine and the pump 25A.
The control device frequency converter box is the technical key of an explosion-proof electric appliance, and the problems of heat dissipation and explosion prevention are effectively solved. The IGBTs of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31 are mounted on a copper plate 25 mm behind the explosion-proof housing, and the back side thereof is mounted with a heat dissipation air duct 19 and a heat dissipation fan 57 according to the fluid mechanics and heat transfer convection, radiation and conduction principles, so that there is a temperature difference between the IGBTs of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31 and different parts of the heat sink, and the heat transfer phenomenon occurs, and the heat dissipation fan 57 is continued until the temperature meets the operation requirements of the VVVF master frequency converter 26 and the VVVF slave frequency converter 31.
The traditional mode high-speed centrifuge can only adopt one motor to drag, utilizes a differential mechanism to adjust the rotating speed of a main roller and an inner rotor, cannot realize stepless speed regulation, has a small speed regulation range and a poor separation effect. The explosion-proof frequency conversion direct current of centrifuge is total to generating line speed governing control system and is overcome traditional centrifuge mode in the past to mechanical device: the VVVF main machine frequency converter 26 and the VVVF auxiliary machine frequency converter 31 can perform stepless speed regulation, and the speed regulation is convenient. The closed-loop control can be realized by timely adjusting the rotating speed of the VVVF main machine frequency converter 26 and the VVVF auxiliary machine frequency converter 31 and the liquid inlet quantity of the centrifugal machine according to the mud concentration and the drilling depth, so that the separation effect is optimal. Soft start and soft stop can be realized, and the start is stable. The explosion-proof variable-frequency direct-current common-bus speed regulation control system of the centrifugal machine overcomes the defects that the impact of the traditional centrifugal machine mode on a mechanical device is small, the power supply grid impact is small, and the service life of the mechanical device is prolonged.
The invention has the following technical parameters and specifications:
the VVVF host frequency converter 26 is matched with the host motor 19: 45KW 4 pole
The VVVF host inverter 31 is matched with the auxiliary motor 17: 11KW 6 pole
The pump motor 34: 7.5KW 4 pole
Rotating speed of the rotary drum: n is 1600-: the initial setting is adjustable within 0-500 s.
And (4) normally stopping the machine: and (4) stably stopping the main motor 19, delaying for 10 minutes, and stopping the auxiliary motor 17.
Emergency shutdown: when the system is abnormally operated, a worker can press the emergency stop button 62 to check the abnormal condition.
And inputting an alternating current into a power supply. The voltage continuously fluctuates by no more than +/-20%, the frequency fluctuates by no more than +/-20%, and the frequency change per minute is no more than +/-1%.
The start sequence of this patent implements: according to the 'operation regulation' requirement of the high-speed centrifuge, after the power is switched on, the flange cover 40 of the explosion-proof box reads the alternating current 380V voltage of a power indicator 44 digital meter through the explosion-proof glass of the observation window, and the power switch-on of the speed regulation control system is confirmed.
Setting an auxiliary machine power frequency conversion selection 46 change-over switch at a frequency conversion position; setting an auxiliary machine frequency conversion start-stop selection 55 change-over switch at a starting position, and setting a main machine power frequency conversion selection 45 change-over switch at a frequency conversion position after an auxiliary machine frequency converter 31 drives a motor 17 of an auxiliary machine to normally operate according to a rotating speed set by a change-over switch setting of an auxiliary machine rotating speed adjustment 54; the host frequency conversion start-stop selection 52 change-over switch is arranged at the starting position, the VVVF host frequency converter 26 drives the host motor 19 to operate according to the rotating speed set by the change-over switch of the host rotating speed adjustment 53, the pump motor 34 can be started after the rotating speed of the host is increased from zero to the set rotating speed (1200-
The shutdown sequence is that the slurry supply pump is stopped in sequence, the slurry supply pump is stopped and stopped by 62 change-over switches, the main machine frequency conversion start-stop selection 52 change-over switches are arranged at the stop position, the main machine frequency converter 26 softly stops the main machine motor 19 according to the set deceleration time, and the auxiliary machine motor 17 is delayed for 10 minutes and stops. When the system is abnormally operated, a worker can press the emergency stop button 62 to check the abnormal condition.
The liquid supply pump motor 34 starts the self-locking protection, and if the host motor 19 does not reach the normal working state or the centrifuge is abnormal, the liquid supply pump motor 34 can not start up through logic control.
The invention relates to an explosion-proof variable-frequency direct-current common bus speed regulation control system of an oil field drilling solid control centrifuge, which realizes temperature monitoring and control in an explosion-proof box body; the control box is internally provided with a heat dissipation air duct 56 of a heat dissipation fan 57, a BK1 transformer 37 of the heat dissipation air duct, a KM7 contactor 38 heater 39 and a host controller 10 so as to ensure the environmental working conditions of the VVVF host frequency converter 26 and related control elements. The working state control is completed by manual operation and temperature alarm prompt. The entire control system should automatically monitor the temperature changes within the control box. If the temperature is too high, the temperature alarm gives an alarm, the cooling system is started, and the dehumidifying heater is started when the temperature is lower than minus 10 ℃ so as to prevent the influence of condensation on the operation of the VVVF main machine frequency converter 26, the VVVF main machine frequency converter 26 and electrical elements.
Damping of the control system of the invention: as vibrations are generated during handling and operation of the drilling equipment. Therefore, the mounting base plate 51 is connected with the shock absorber 53 by the fixing bolt 52 to realize vibration prevention, and accidents caused by loosening of electric appliance elements, signal lines and connecting plug-in units used by a control system can be effectively avoided.
Control of the cooling fan 57; the cooling fan 57 is automatically started and stopped by the host controller 10 when the VVVF host frequency converter 26 is in the operating state, and the cooling fan 57 does not need to be started in the power frequency state.
The host rotation speed adjustment 55 switch is pulled to sequentially select the operation parameters such as the frequency set value, the output current, the output voltage, the synchronous speed, the linear speed, the load speed, the torque, the input power, the PID command, the PID remote command, the PID feedback quantity and the like of the VVVF host frequency converter 26.
This patent malfunction alerting is stopped to be realized: the main motor 19 and the slurry supply pump motor 34 must both have automatic stop and manual stop functions. The frequency converter has an alarm setting. When the high-speed centrifuge has abnormal stall fault, the main switch of the emergency stop button 62 is pressed to stop.
The design of the structure diagram of the explosion-proof box in figures 3-5 meets the general requirements of electrical equipment in the explosive gas atmosphere of GB3836 and 1-2010: and (4) explosion-proof type'd'.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Oil recovery circulation mud high speed centrifuge is explosion-proof control system of variable frequency speed governing of generating line altogether, characterized in that, this system includes auxiliary machine controller (1), auxiliary machine display (2), auxiliary machine interface (3), direct current is bus (4) altogether, rectifier (5), reactor (6), charging unit (7), control power supply (8), control transformer (9), host computer controller (10), host computer display (11), host computer interface (12), auxiliary machine driver (13), resistance-capacitance absorber (14), auxiliary machine inverter (15), auxiliary machine temperature sensor (16), auxiliary machine motor (17), host computer inverter (18), host computer motor (19), host computer temperature sensor (20), main motor driver (21).
2. The oil recovery circulation mud high-speed centrifuge common bus frequency conversion speed regulation explosion-proof control system is characterized in that a main loop of the system comprises an FR2 thermal relay (22), a QF circuit breaker (23), a TZ1 explosion-proof plug-in (24), a KM3 AC contactor (25), a VVVVF host frequency converter (26), an FR1 thermal relay (26), an FR1 thermal relay (27), a KM2 AC contactor (28), a KM1 AC contactor (29), a KM4 AC contactor (30), a VVVF auxiliary frequency converter (31), a KM5 AC contactor (32), an FR3 thermal relay (33), a TZ1 slurry supply pump motor (34), a KM6 AC contactor (35), a heat dissipation fan (36), a BK1 transformer (37), a KM7 AC contactor (38) and an electric heater (39).
3. The oil recovery circulation mud high-speed centrifuge common-bus variable-frequency speed regulation explosion-proof control system according to claim 2, the system is characterized in that the external structure of the system comprises an explosion-proof box flange plate cover (40), an auxiliary frequency display (41), a host frequency display (42), a temperature display (43), a power supply indication (44), a power frequency conversion selection (45), an auxiliary power frequency selection (46), an auxiliary power frequency start-stop (47), a TZ2 explosion-proof plug connector (48), a host rotating speed display (49), an auxiliary rotating speed display (50), a host power frequency start-stop (51), a host frequency conversion start-stop (52), a host rotating speed adjustment (53), an auxiliary rotating speed adjustment (54), an auxiliary frequency conversion start-stop (55), a radiating air duct (56), a radiating fan (57), a support piece (58), a mounting base plate (59), a fixing bolt (60), a shock absorber (61) and an emergency stop button (62).
4. The system of claim 3, wherein when the speed of the two frequency converter main machines and the auxiliary machine form slip, the auxiliary machine and the main machine are mutually related through a mud medium, the auxiliary machine motor is in a regeneration state, and the generated regenerated electric energy is transmitted to the direct current side filter capacitor to generate overvoltage.
5. The oil recovery circulation mud high speed centrifuge common bus frequency conversion speed regulation explosion-proof control system according to claim 4, characterized in that, the IGBTs of the VVVF host frequency converter (26) and the VVVF auxiliary frequency converter (31) are installed on a copper plate which is a part of an explosion-proof shell and is 25 mm behind, the back surface of the copper plate is provided with a heat dissipation air duct (56) and a heat dissipation fan (57), temperature differences exist between the IGBTs of the VVVVF host frequency converter (26) and the VVVF auxiliary frequency converter (31) and between different parts of a radiator, and the heat dissipation fan (57) continuously operates until the temperature meets the operation requirements of the VVVF host frequency converter (26) and the VVVF auxiliary frequency converter (31).
6. The common-bus variable-frequency speed-regulating explosion-proof control system of the oil recovery circulation slurry high-speed centrifuge as claimed in claim 5, wherein a heat radiation fan (57), a heat radiation air duct (56), a BK1 transformer (37), a KM7 contactor (38), an electric heater (39) and a host controller (10) are arranged in the control box; the control system monitors the temperature change in the control box, when the temperature is higher than a threshold value, the temperature alarm gives an alarm, the heat dissipation system is started, and when the temperature is lower than minus 10 ℃, the dehumidification heater is started.
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| CN202110228669.6A CN112886902A (en) | 2021-03-02 | 2021-03-02 | Common bus variable frequency speed regulation explosion-proof control system of oil extraction circulation slurry high-speed centrifuge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117998A (en) * | 2022-05-25 | 2022-09-27 | 中国恩菲工程技术有限公司 | Emergency power supply device and transmission device of rotary furnace body |
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| CN105921292A (en) * | 2016-06-03 | 2016-09-07 | 重庆师范大学 | Centrifugal machine control system |
| CN108495535A (en) * | 2018-05-29 | 2018-09-04 | 孙乃辉 | A kind of block coupled in series type high-voltage frequency converter water-cooling type radiator |
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| JP2002191102A (en) * | 2000-12-20 | 2002-07-05 | Toshiba Corp | Power supply device for vehicle and controlling device thereof |
| CN201239668Y (en) * | 2008-07-31 | 2009-05-20 | 苏州市职业大学 | Double-electric machine variable-frequency control spiral centrifugal machine |
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