CN111224605A - Drilling machine oil power change control system and method adopting medium-voltage frequency conversion direct drive - Google Patents
Drilling machine oil power change control system and method adopting medium-voltage frequency conversion direct drive Download PDFInfo
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- CN111224605A CN111224605A CN201911026101.5A CN201911026101A CN111224605A CN 111224605 A CN111224605 A CN 111224605A CN 201911026101 A CN201911026101 A CN 201911026101A CN 111224605 A CN111224605 A CN 111224605A
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- 238000005553 drilling Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 8
- 239000010721 machine oil Substances 0.000 title claims abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 230000005611 electricity Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims 2
- 239000003208 petroleum Substances 0.000 abstract description 9
- 230000010354 integration Effects 0.000 abstract description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention provides a system and a method for changing petroleum drilling machine oil into electricity and driving medium-voltage frequency conversion, which consists of a medium-voltage power supply and distribution module, a medium-voltage frequency conversion transmission module, a low-voltage power supply and distribution module and a PLC (programmable logic controller) comprehensive control module, wherein the medium-voltage power supply and distribution module is used for completing the access, protection and distribution of a 6/10kV medium-voltage power grid power supply; the medium-voltage variable-frequency transmission module consists of two groups of high-voltage frequency converters with buffer loops and a medium-voltage variable-frequency motor and is used for finishing driving and protecting a main power system; the low-voltage power supply and distribution module consists of a double-auxiliary winding transformer and a power distribution switch cabinet, provides various control power supplies for the system, and provides AC400V, AC600V low-voltage power distribution and protection for an MCC (Motor control center) system and a top drive system of the petroleum drilling machine; the PLC integrated control module realizes automatic control of operation, protection, interlocking and the like of the whole set of system, and the invention has the advantages of high integration level, small volume, high system power factor, low harmonic wave, small starting current, no pollution and no impact on a power grid and the like; the wiring mode is flexible and convenient, and the device can be generally used for 10kV and 6kV power grids.
Description
Technical Field
The invention relates to an electric control system of petroleum drilling machine equipment, in particular to an electric control system and method for changing petroleum drilling machine oil into electricity and driving at medium voltage by frequency conversion.
Background
At present, oil-to-calcium carbide oil drilling machines used in various large oil fields in China save diesel oil, reduce production cost and reduce pollution, but main driving systems all adopt low voltage of 600V, the system consists of 2 to 3 control rooms and 2 low-voltage motors, the size is large, the transportation is inconvenient, the loss is high, the efficiency is low, the impact on a power grid is large during high-voltage power transmission, the transportation and the operation in the field and mountainous regions with inconvenient traffic are inconvenient, and the power grid with smaller capacity is inconvenient to access.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a drilling oil power-change control system adopting medium-voltage variable-frequency direct drive.
The technical scheme adopted by the invention is as follows: a medium-voltage variable-frequency driving system for changing petroleum drilling machine oil into electricity is composed of a medium-voltage power supply and distribution module, a medium-voltage variable-frequency transmission module, a low-voltage power supply and distribution module and a PLC comprehensive control module;
the medium-voltage power supply and distribution module is used for completing access, protection and distribution of a 6/10kV medium-voltage power grid power supply, and consists of 1 medium-voltage incoming line cabinet and No. 1, 2 and 3 medium-voltage outgoing line cabinets, wherein the medium-voltage incoming line cabinet and the No. 1, 2 and 3 medium-voltage outgoing line cabinets are connected in parallel through busbars, the medium-voltage incoming line cabinet and the No. 1, 2 and 3 medium-voltage outgoing line cabinets are air-insulated medium-voltage ring network cabinets, the protection function is complete, the cabinets are internally provided with PT and lightning arrester devices with 6kV and 10kV voltage grades, and the access, distribution and protection of the 6kV and 10kV medium-voltage power grid power supplies can be flexibly met through switching wiring;
the medium-voltage variable-frequency transmission module is used for finishing the driving and protection of a main power system and comprises two groups of medium-voltage frequency converters with buffer loops respectively, each medium-voltage frequency converter is electrically connected with a medium-voltage variable-frequency motor, and the medium-voltage variable-frequency transmission module (2) has a power factor of more than or equal to 0.97 and a harmonic content of less than or equal to 2 percent in operation and has no pollution to a power grid; the primary sides of the rectifier transformers of the two medium-voltage frequency converters have two connection modes of star type and triangle type, a star connection method is adopted when the network voltage is 10kV, and a triangle connection method is adopted when the network voltage is 6kV, so that two medium-voltage power networks of 6kV and 10kV can be compatible; by taking one group of buffer circuits as an example, the operation characteristics of the buffer circuit are explained, wherein the No. 1 buffer circuit consists of a buffer resistor R1 and a bypass contactor K1 and is connected between a No. 1 medium-voltage line cabinet and a No. 1 medium-voltage frequency converter in series; when the No. 1 medium voltage wire-out cabinet supplies power to the No. 1 medium voltage frequency converter, current firstly passes through the buffer resistor R1, when the voltage of the No. 1 medium voltage frequency converter rises to a certain value, the bypass contactor K1 is closed, the power supply of the No. 1 medium voltage frequency converter is completed, and the No. 1 medium voltage frequency conversion motor can be driven to normally work; the other group of No. 2 buffer circuits work the same;
the low-voltage power supply and distribution module consists of a No. 3 buffer loop, a double-auxiliary winding transformer and a distribution switch cabinet, wherein the No. 3 buffer loop consists of a buffer resistor R3 and a bypass contactor K3 and is connected between the No. 3 medium voltage outlet cabinet and the double-auxiliary winding transformer in series; when the No. 3 medium voltage outlet cabinet supplies power to the double-secondary winding transformer, current firstly passes through a buffer resistor R3, when the primary voltage of the double-secondary winding transformer rises to a certain value, a bypass contactor K3 is closed, and the double-secondary winding transformer finishes supplying power; the secondary side of the double-secondary winding transformer is provided with two windings of AC400V and AC600V, the winding of AC400V is in a star connection, the winding of AC600V is in a triangle connection, the AC400V provides various control power supplies for the system, provides a total power supply for an AC400V MCC system of the oil drilling machine, and provides power distribution and protection for a top drive system by AC 600V;
the PLC comprehensive control module is a control center of the system, is communicated and connected with the medium-voltage power supply and distribution module (1), the medium-voltage variable-frequency transmission module and the low-voltage power supply and distribution module, and realizes automatic control functions of operation, protection, interlocking and the like of the whole system according to the drilling process requirements.
The four modules (except the No. 1 and No. 2 medium-voltage variable frequency motors) are intensively arranged in a control room with the length of 10 meters, the width of 2.8 meters and the height of 3 meters.
A method for adopting the above-mentioned system to carry on the electrical control, nkV the electricity of the electric wire netting enters the copper mother row through the inlet cabinet of the medium voltage, 1 in the outlet cabinet of the medium voltage, 2 in the outlet cabinet of the medium voltage, 3 in the outlet cabinet of the medium voltage is electrified, close 3 in the outlet cabinet of the medium voltage, the current supplies power for the transformer of double good winding through the snubber resistor R3 in the snubber loop 3, because there is a snubber resistor R3 current-limiting, 3 in the outlet cabinet of the medium voltage closes and has almost no impact to the electric wire netting, when the primary side voltage of the transformer of double good winding is close to nkV, the contactor K3 in the snubber loop attracts, the transformer of double good winding supplies power and finishes, close the corresponding power supply breaker in the low-voltage distribution switch cabinet, supply power for system control power, rig MCC system;
closing the No. 1 medium voltage outgoing line cabinet, supplying power to the No. 1 medium voltage frequency converter through a buffer resistor R1 in a No. 1 buffer loop, wherein the buffer resistor R1 is used for limiting the current, the No. 1 medium voltage outgoing line cabinet is closed to hardly impact a power grid, when the voltage of the No. 1 medium voltage frequency converter approaches nkV, a contactor K1 in the No. 1 buffer loop is closed, and the power supply of the No. 1 medium voltage frequency converter is completed;
closing No. 2 medium voltage outlet cabinet, the electric current supplies power for No. 2 medium voltage inverter through the buffer resistance R2 in No. 2 buffer circuit, because of there is buffer resistance R2 current-limiting, No. 2 medium voltage outlet cabinet closes a floodgate and hardly has the impact to the electric wire netting, when No. 2 medium voltage inverter carry out the voltage and be close to nkV, contactor K2 actuation in No. 2 buffer circuit, No. 2 medium voltage inverter supplies power and accomplishes.
Compared with the prior art, the invention has the beneficial effects that:
the system comprises a medium-voltage power supply and distribution module, a medium-voltage variable-frequency transmission module, a low-voltage power supply and distribution module and a PLC (programmable logic controller) comprehensive control module, wherein the medium-voltage power supply and distribution module is compatible with a 6kV and 10kV medium-voltage power grid and completes the access, protection and distribution of a 6/10kV medium-voltage power grid power supply through the medium-voltage power supply and distribution module; the medium-voltage variable-frequency transmission module and the low-voltage power supply and distribution module are respectively provided with a buffer loop, the medium-voltage variable-frequency transmission module is used for driving and protecting a main power system, the low-voltage power supply and distribution module is used for providing various control power supplies for the system, and the low-voltage power supply and distribution module is used for providing AC400V, AC600V low-voltage power distribution and protection for an MCC (China center control) system and a top drive system of the petroleum drilling machine; and automatic control functions of operation, protection, interlocking and the like of the whole set of system are realized through the PLC integrated control module according to the drilling process requirements. The invention has the advantages of high integration level, small volume and convenient disassembly, assembly and transportation; the system has high power factor, low harmonic wave, small starting current, no pollution and no impact on the power grid; the medium-voltage frequency converter is adopted, the working current is 1/10-1/17 of the low voltage, the equipment loss is greatly reduced, and the overall efficiency is obviously improved; the wiring mode is flexible, and the device can be generally used for 10kV and 6kV power grids.
Drawings
FIG. 1 is a system diagram of the present invention;
in the figure: 1. the system comprises a medium-voltage power supply and distribution module, 2, a medium-voltage variable-frequency transmission module, 3, a low-voltage power supply and distribution module, 4, a PLC comprehensive control module, 12, a medium-voltage incoming cabinet, 13, a medium-voltage outgoing cabinet No. 1, 14, a medium-voltage outgoing cabinet No. 2, a medium-voltage outgoing cabinet No. 15, a medium-voltage outgoing cabinet No. 3, a buffer circuit No. 21, a buffer circuit No. 1, a medium-voltage frequency converter No. 22, a medium-voltage frequency converter No. 1, a medium-voltage motor No. 23, a buffer circuit No. 2, a medium-voltage frequency converter No. 25, a medium-voltage frequency converter No. 2, a medium-voltage motor No. 26, a medium-voltage motor.
Detailed Description
The invention is explained in further detail below with reference to the figures and examples;
a medium-voltage variable-frequency driving system for changing petroleum drilling machine oil into electricity is composed of a medium-voltage power supply and distribution module 1, a medium-voltage variable-frequency transmission module 2, a low-voltage power supply and distribution module 3 and a PLC (programmable logic controller) comprehensive control module 4;
the medium-voltage power supply and distribution module 1 is used for completing access, protection and distribution of a 6/10kV medium-voltage power grid power supply, and consists of 1 medium-voltage incoming line cabinet 12, 1, 2 and 3 medium-voltage outgoing line cabinet, wherein the medium-voltage incoming line cabinet 12 and the medium-voltage outgoing line cabinets 1, 2 and 3 are connected in parallel through a bus bar 11, the medium-voltage incoming line cabinet 12 and the medium-voltage outgoing line cabinets 1, 2 and 3 are air-insulated medium-voltage ring network cabinets, the protection function is complete, the medium-voltage incoming line cabinets are internally provided with PT and lightning arrester devices with 6kV and 10kV voltage levels, and the access, distribution and protection of the 6kV and 10kV medium-voltage power grid power supplies can be flexibly met through switching wiring;
the medium-voltage variable-frequency transmission module 2 completes the driving and protection of a main power system and comprises two groups of medium-voltage frequency converters with buffer loops respectively, each medium-voltage frequency converter is electrically connected with a medium-voltage variable-frequency motor, and the medium-voltage variable-frequency transmission module 2 has a power factor of more than or equal to 0.97 and a harmonic content of less than or equal to 2 percent in operation and has no pollution to a power grid; the primary sides of the rectifier transformers of the two medium-voltage frequency converters have two connection modes of star type and triangle type, a star connection method is adopted when the network voltage is 10kV, and a triangle connection method is adopted when the network voltage is 6kV, so that two medium-voltage power networks of 6kV and 10kV can be compatible; taking one group of buffer circuits as an example to illustrate the operation characteristics of the buffer circuit, the buffer circuit 1 consists of a buffer resistor R1 and a bypass contactor K1, and is connected in series between the medium-voltage outlet cabinet 1 13 and the medium-voltage inverter 1 22; when the No. 1 medium voltage outlet cabinet 13 supplies power to the No. 1 medium voltage frequency converter 22, the current firstly passes through the buffer resistor R1, when the voltage of the No. 1 medium voltage frequency converter 22 rises to a certain value, the bypass contactor K1 is closed, the power supply of the No. 1 medium voltage frequency converter 22 is completed, and the No. 1 medium voltage variable frequency motor 23 can be driven to normally work; the other group of No. 2 buffer circuits 24 consists of a buffer resistor R2 and a bypass contactor K2, and the work is the same as that of the buffer resistor R2;
the low-voltage power supply and distribution module 3 comprises a No. 3 buffer loop 31, a double-secondary winding transformer 32 and a distribution switch cabinet 33, wherein the No. 3 buffer loop 31 comprises a buffer resistor R3 and a bypass contactor K3 and is connected in series between the No. 3 medium-voltage outlet cabinet 15 and the double-secondary winding transformer 32; when the No. 3 medium voltage outlet cabinet 15 supplies power to the double-secondary winding transformer 32, current firstly passes through the buffer resistor R3, when the primary voltage of the double-secondary winding transformer 32 rises to a certain value, the bypass contactor K3 is closed, and the double-secondary winding transformer 32 finishes supplying power; the secondary side of the double-secondary winding transformer 32 is provided with two windings of AC400V and AC600V, the winding of AC400V is in a star connection, the winding of AC600V is in a triangle connection, the AC400V provides various control power supplies 34 for the system, provides a total power supply for an AC400V MCC system of the oil drilling machine, and provides power distribution and protection for a top drive system by AC 600V;
the PLC comprehensive control module 4 is a control center of the system, is connected with the medium-voltage power supply and distribution module (1), the medium-voltage variable-frequency transmission module 2 and the low-voltage power supply and distribution module 3 through communication, and realizes automatic control functions of operation, protection, interlocking and the like of the whole system according to the drilling process requirements.
The four modules (except the No. 1 and No. 2 medium-voltage variable frequency motors) are intensively arranged in a control room with the length of 10 meters, the width of 2.8 meters and the height of 3 meters.
Examples
Taking 10kV network power as an example, a specific use method of the oil-to-medium voltage variable frequency drive system of the petroleum drilling machine is described;
line connection: the primary sides of the rectifier transformer of the No. 1 medium-voltage frequency converter 22, the rectifier transformer of the No. 2 medium-voltage frequency converter 25 and the double-winding transformer 23 are all linked according to a star connection method, and the voltage transformers and the lightning arresters in the medium-voltage incoming cabinet 12, the No. 1 medium-voltage outgoing cabinet 13, the No. 2 medium-voltage outgoing cabinet 14 and the No. 3 medium-voltage outgoing cabinet 15 are switched to 10kV gears; the electricity of a 10kV power grid is connected into a medium-voltage incoming cabinet 12 through a medium-voltage cable, and the medium-voltage incoming cabinet 12 is connected with a No. 1 medium-voltage outgoing cabinet 13, a No. 2 medium-voltage outgoing cabinet 14 and a No. 3 medium-voltage outgoing cabinet 15 in parallel through a copper busbar 11.
The No. 1 medium voltage outlet cabinet 13 is connected in series with the No. 1 buffer circuit 21 and is connected with the No. 1 medium voltage frequency converter 22, and the medium voltage frequency converter 22 is connected with the No. 1 medium voltage motor 23. The No. 2 medium voltage outlet cabinet 14 is connected in series with the No. 2 buffer loop 24 and connected with the No. 2 medium voltage frequency converter 25, and the medium voltage frequency converter 25 is connected with the No. 2 medium voltage motor 26.
The No. 3 medium-voltage outlet cabinet 15 is connected with the No. 3 buffer circuit 31 in series and is connected with the double-winding transformer 32, the secondary side AC400V of the double-winding transformer 32 provides various control power supplies for the system through the low-voltage distribution switch cabinet 33, meanwhile, the main power supply is provided for the petroleum drilling machine AC400V MCC system, and the secondary side AC600V of the double-winding transformer 32 provides a distribution power supply for the top drive system through the low-voltage distribution switch cabinet 33.
The PLC comprehensive control module 4 is a control center of the system and is connected with the medium-voltage power supply and distribution module 1, the medium-voltage variable-frequency transmission module 2 and the low-voltage power supply and distribution module 3 through communication.
Electrical control: the electricity of a 10kV power grid enters a copper busbar 11 through a medium-voltage incoming cabinet 12, a No. 1 medium-voltage outgoing cabinet 13, a No. 2 medium-voltage outgoing cabinet 14 and a No. 3 medium-voltage outgoing cabinet 15 are electrified, the No. 3 medium-voltage outgoing cabinet 15 is closed, the current supplies power to a double-winding transformer 32 through a buffer resistor R3 in a No. 3 buffer loop 31, the No. 3 medium-voltage outgoing cabinet 15 is closed to have almost no impact on the power grid due to the current limiting of a buffer resistor R3, when the primary voltage of the double-winding transformer 32 is close to 10kV, a contactor K3 in the buffer loop 13 is closed, the power supply of the double-winding transformer 32 is completed, and a corresponding power supply breaker in a low-voltage distribution switch cabinet 33 is closed to supply power to a system control power supply, a drilling machine MCC. Close 1 # medium voltage outgoing line cabinet 13, the buffer resistance R1 among the buffer circuit 21 of current-carrying current gives 1 # medium voltage inverter 22 power supply, because of there is buffer resistance R1 current-limiting, 1 # medium voltage outgoing line cabinet 13 closes a floodgate and hardly has the impact to the electric wire netting, when carrying out voltage of 1 # medium voltage inverter 22 and being close to 10kV, contactor K1 actuation among 1 # buffer circuit 21, 1 # medium voltage inverter 22 power supply is accomplished. Closing No. 2 medium voltage wire-out cabinet 14, the electric current supplies power for No. 2 medium voltage frequency converter 25 through the buffer resistance R2 among No. 2 buffer circuit 24, because of there is buffer resistance R2 current-limiting, No. 2 medium voltage wire-out cabinet 14 closes a floodgate and hardly has the impact to the electric wire netting, when No. 2 medium voltage frequency converter 25 carry out voltage and be close to 10kV, contactor K2 actuation among No. 2 buffer circuit 24, No. 2 medium voltage frequency converter 25 supplies power and accomplishes. The PLC comprehensive control module 4 monitors the running states of all devices in the medium-voltage power supply and distribution module 1, the medium-voltage variable-frequency transmission module 2 and the low-voltage power supply and distribution module 3 in real time, controls the running of the medium-voltage motor No. 1 23 and the medium-voltage motor No. 2 in real time according to the drilling process requirements, realizes the automatic control functions of operation, protection, interlocking and the like of the whole system, and is a control center of the system.
Claims (4)
1. The utility model provides an adopt rig oil that medium voltage frequency conversion directly drives to change electric control system which characterized in that: the system consists of a medium-voltage power supply and distribution module (1), a medium-voltage variable-frequency transmission module (2), a low-voltage power supply and distribution module (3) and a PLC (programmable logic controller) comprehensive control module (4);
the medium-voltage power supply and distribution module (1) is used for completing access, protection and distribution of a 6/10kV medium-voltage power grid power supply, and consists of 1 medium-voltage incoming line cabinet (12) and 1, 2 and 3 number medium-voltage outgoing line cabinets (13, 14 and 15), wherein the medium-voltage incoming line cabinet (12) and the 1, 2 and 3 number medium-voltage outgoing line cabinets (13, 14 and 15) are connected in parallel through a busbar (11), the medium-voltage incoming line cabinet (12) and the 1, 2 and 3 number medium-voltage outgoing line cabinets (13, 14 and 15) are air-insulated medium-voltage ring main units, PT and lightning arrester devices with two voltage levels of 6kV and 10kV are arranged in the medium-voltage incoming line cabinets, and access, distribution and protection of the 6kV and 10kV medium-voltage power grid power supplies can be flexibly met through switching connection;
the medium-voltage variable-frequency transmission module (2) completes the driving and protection of a main power system, and comprises two groups of medium-voltage frequency converters with buffer loops respectively, each medium-voltage frequency converter is electrically connected with a medium-voltage variable-frequency motor, the power factor of the medium-voltage variable-frequency transmission module (2) is more than or equal to 0.97, the harmonic content is less than or equal to 2 percent during the operation, and the medium-voltage variable-frequency transmission module has no pollution to a power grid; the primary sides of the rectifier transformers of the two medium-voltage frequency converters have two connection modes of star type and triangle type, a star connection method is adopted when the network voltage is 10kV, and a triangle connection method is adopted when the network voltage is 6kV, so that the two medium-voltage power networks of 6kV and 10kV are compatible;
the low-voltage power supply and distribution module (3) consists of a No. 3 buffer loop (31), a double-auxiliary winding transformer (32) and a distribution switch cabinet (33), wherein the No. 3 buffer loop (31) consists of a buffer resistor R3 and a bypass contactor K3 and is connected between a No. 3 medium voltage outlet cabinet (15) and the double-auxiliary winding transformer (32) in series; when the No. 3 medium voltage outgoing line cabinet (15) supplies power to the double-secondary winding transformer (32), current firstly passes through the buffer resistor R3, when the primary voltage of the double-secondary winding transformer (32) rises to a certain value, the bypass contactor K3 is closed, and the power supply of the double-secondary winding transformer (32) is completed; the secondary side of the double-secondary winding transformer (32) is provided with two windings of AC400V and AC600V, the AC400V winding is in a star connection, the AC600V winding is in a triangle connection, the AC400V provides various control power supplies (34) for the system, provides a total power supply for an AC400V MCC system of the oil drilling machine, and provides power distribution and protection for a top drive system by AC 600V;
the PLC comprehensive control module (4) is a control center of the system and is connected with the medium-voltage power supply and distribution module (1), the medium-voltage variable-frequency transmission module (2) and the low-voltage power supply and distribution module (3) through communication.
2. The drilling machine oil power-change control system adopting medium-voltage variable-frequency direct drive as claimed in claim 1, is characterized in that: two sets of buffer circuit of middling pressure frequency conversion transmission module, one of them is by buffer resistance R1, bypass contactor K1 is constituteed, it is between extrusion line cabinet (13) and No. 1 medium voltage inverter (22) to concatenate in No. 1, when extrusion line cabinet (13) gives No. 1 medium voltage inverter (22) power supply in No. 1, the electric current passes through buffer resistance R1 earlier, after No. 1 medium voltage inverter (22) voltage rises to a definite value, bypass contactor K1 is closed, No. 1 medium voltage inverter (22) power supply is accomplished, drive No. 1 medium voltage inverter motor (23) normal work, another group's buffer circuit work is with this the same.
3. The drilling machine oil power-change control system adopting medium-voltage variable-frequency direct drive as claimed in claim 1, is characterized in that: except two medium-voltage variable-frequency motors, the rest of the four modules are installed in a control room in a centralized manner.
4. A method of electrical control using the system of any one of claims 1 to 3, wherein: nkV the electricity of the electric network enters the copper busbar (11) through the medium voltage inlet cabinet (12), the 1 # middle outlet cabinet (13), 2 # middle outlet cabinet (14), 3 # middle outlet cabinet (15) are electrified, the 3 # middle outlet cabinet (15) is closed, the current supplies power to the double-winding transformer (32) through the buffer resistor R3 in the 3 # buffer loop (31), the current is limited by the buffer resistor R3, the 3 # middle outlet cabinet (15) is closed and has almost no impact on the electric network, when the primary voltage of the double-winding transformer (32) is close to nkV, the contactor K3 in the buffer loop (13) is closed, the double-winding transformer (32) completes the power supply, the corresponding power supply breaker in the low voltage distribution switch cabinet (33) is closed, and the system control power supply, the drill MCC system and the top drive system are supplied with power;
closing a No. 1 medium voltage wire outlet cabinet (13), supplying power to a No. 1 medium voltage frequency converter (22) through a buffer resistor R1 in a No. 1 buffer loop (21), wherein the current is limited by a buffer resistor R1, the No. 1 medium voltage wire outlet cabinet (13) is closed to almost have no impact on a power grid, when the voltage of the No. 1 medium voltage frequency converter (22) is close to nkV, a contactor K1 in the No. 1 buffer loop (21) is closed, and the power supply of the No. 1 medium voltage frequency converter (22) is completed;
closing No. 2 medium voltage inverter cabinet (14), the current supplies power for No. 2 medium voltage inverter (25) through the buffer resistance R2 in No. 2 buffer circuit (24), because of there is the buffer resistance R2 current limiting, No. 2 medium voltage inverter cabinet (14) closes a floodgate and hardly has the impact to the electric wire netting, when the voltage that carries on of No. 2 medium voltage inverter (25) is close to nkV, the actuation of contactor K2 in No. 2 buffer circuit (24), No. 2 medium voltage inverter (25) power supply is accomplished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911026101.5A CN111224605B (en) | 2019-10-25 | 2019-10-25 | Drilling machine oil change control system and method adopting medium-voltage variable-frequency direct drive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911026101.5A CN111224605B (en) | 2019-10-25 | 2019-10-25 | Drilling machine oil change control system and method adopting medium-voltage variable-frequency direct drive |
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| CN111224605B CN111224605B (en) | 2024-05-17 |
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