CN116335625B - Petroleum drilling machine hybrid power system based on energy storage system and optimal control method thereof - Google Patents
Petroleum drilling machine hybrid power system based on energy storage system and optimal control method thereof Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 107
- 238000005553 drilling Methods 0.000 title claims abstract description 86
- 239000003208 petroleum Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005457 optimization Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 45
- 230000005540 biological transmission Effects 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 239000003345 natural gas Substances 0.000 abstract description 3
- 239000003209 petroleum derivative Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 10
- 239000000446 fuel Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Power Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides an energy storage system-based petroleum drilling machine hybrid power system and an optimization control method thereof, belonging to the technical field of petroleum and natural gas drilling and production, wherein the system comprises an electronic system for providing electric energy supply for a control system and a driving system; the control subsystem is used for controlling the operation mode and the cooperative operation mode of the drilling machine by utilizing the power management PMS; the driving subsystem is used for controlling the driving drilling machine to perform drilling operation based on the operation mode and the cooperative operation mode; and the energy storage subsystem is used for storing or releasing electric energy in real time in a low-load interval by using a mode of alternately supplying power to the battery pack and the generator set based on the operation mode and the cooperative operation mode. The invention solves the problems that the power generation efficiency of the hybrid power system of the crude petroleum drilling machine is low and pollutants cannot be completely combusted.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas drilling and production, and particularly relates to a petroleum drilling machine hybrid power system based on an energy storage system and an optimal control method thereof.
Background
At present, an electric variable frequency drilling machine is mostly adopted in petroleum and natural gas drilling operation, and an electric system of the electric variable frequency drilling machine consists of a plurality of power generation devices, variable frequency control devices, instrument control devices and the like. Because the working conditions of the drilling machine are complex and changeable, the load rate of the generator set fluctuates frequently, the time of the load rate being lower than 30% is more, and the energy efficiency of the system is low; in the dynamic adjustment process of the generator, the incomplete combustion of fuel has more pollutant emission and air pollution.
Meanwhile, in order to ensure power supply continuity and improve load impact resistance, the original system generally adopts a parallel operation mode of a plurality of generators, a unit operates in a 10% -30% load rate interval for a long time, and an optimal operation working point of the generator set is in a 70% -80% load rate interval, so that the power generation efficiency of the original system is low.
Disclosure of Invention
Aiming at the defects in the prior art, the petroleum drilling machine hybrid power system based on the energy storage system and the optimal control method thereof provided by the invention solve the problems that the power generation efficiency of the original petroleum drilling machine hybrid power system is low and pollutants cannot be completely combusted.
In order to achieve the above purpose, the invention adopts the following technical scheme: an energy storage system-based oil rig hybrid system comprising:
a power supply subsystem for providing a supply of electrical power to the control subsystem and the drive subsystem;
the control subsystem is used for controlling the operation mode and the cooperative operation mode of the petroleum drilling machine by utilizing the power management PMS;
the driving subsystem is used for controlling and driving the petroleum drilling machine to perform drilling operation based on the operation mode and the cooperative operation mode;
and the energy storage subsystem is used for storing or releasing electric energy in real time in a low-load interval by using a mode of alternately supplying power to the battery pack and the generator set based on the operation mode and the cooperative operation mode.
The beneficial effects of the invention are as follows: according to the invention, the energy storage subsystem is added on the original drilling machine hybrid power system, and the power management PMS is implemented, so that the PMS is applied to coordinate control of the generator set and the energy storage subsystem in the hybrid power system, the system efficiency can be improved, the impact load receiving frequency of the generator is reduced, the pollutant emission is reduced, and the original system is improved to ensure the power supply continuity and improve the load impact resistance.
Further, the power supply system comprises a generator set, and the generator set is respectively connected with the control subsystem and the driving subsystem through cables.
The beneficial effects of the above-mentioned further scheme are: the invention provides stable electric energy for drilling machine equipment through the modularized integrated generator set.
Still further, the control subsystem includes:
the transmission unit is used for converting fixed-frequency alternating current into a variable-frequency power supply, controlling the operation of the slurry pump, the winch and the top drive motor based on a control command, and is connected with the generator set;
the PLC control unit is used for collecting running state signals of the slurry pump, the winch and the top drive, receiving fault alarm signals and sending control commands to the transmission unit;
the drilling machine control unit is used for receiving the running state signal transmitted by the PLC control unit, issuing a control instruction to the PLC control unit according to the drilling requirement, and acquiring real-time petroleum drilling machine load data and drilling working condition states;
the power management PMS unit is used for judging the number of generators required to run and the power required to be executed for storing energy under the current drilling working condition based on the real-time petroleum drilling machine load data and the drilling working condition state, and outputting the judging result to the generator set and the energy storage subsystem for executing so as to coordinate and schedule the generator set and the energy storage subsystem.
The beneficial effects of the above-mentioned further scheme are: according to the invention, the functions of all subsystems of the equipment layer are independent through layered control of the equipment layer and the system layer, and meanwhile, the functions of all subsystems of the equipment layer are coordinated and scheduled by an upper system, so that the operation efficiency and the safety are improved.
Still further, the drive subsystem includes a hoist motor, a mud pump motor, an encoder, a top drive, a hoist, and a mud pump;
the output shaft of the mud pump motor is connected with the input shaft of the mud pump through a gear, the output shaft of the winch motor is connected with the input shaft of the winch through a coupling, the encoder is positioned at the tail part and on the top drive of the winch motor, the encoder, the winch motor, the top drive and the mud pump motor are all connected with the transmission unit, and the top drive, the mud pump and the sensing equipment of the winch are all connected with the PLC control unit.
The beneficial effects of the above-mentioned further scheme are: according to the full-electric variable-frequency drilling equipment, the energy efficiency of the equipment can be improved, meanwhile, the encoder is adopted for closed-loop control, the speed control precision is improved, and the drilling process requirements are better met.
Still further, based on the operation mode and the cooperative operation mode, the method of alternately supplying power to the battery pack and the generator set in the low-load interval is used for storing or releasing electric energy in real time, which is specifically as follows:
based on the operation mode and the cooperative operation mode, receiving a power management PMS scheduling signal, and charging the battery pack when the load rate of the generator set is lower than a preset set value, so as to raise the load rate of the generator set to the preset set value; and when the load rate of the generator set is higher than a preset set value, discharging the battery pack outwards, and reducing the load rate of the generator set to the preset set value.
The beneficial effects of the above-mentioned further scheme are: the invention applies PMS to coordinate control of the generator set and the energy storage subsystem in the hybrid power system, can improve the system efficiency and reduce the frequency of the generator receiving impact load.
Still further, the energy storage subsystem comprises an energy storage room, the energy storage room is connected with the transmission unit through a cable, and the energy storage room comprises an alternating current-direct current (AC-DC) bidirectional converter, a battery pack, a circuit breaker, a voltage detection device, a power detection device, a communication module, a controller and a temperature and humidity sensor;
the battery pack is connected with the direct current side of the alternating current-direct current bidirectional converter, the alternating current-direct current bidirectional converter is connected with the circuit breaker, the circuit breaker is connected with an alternating current bus of the power supply system, a detection point of the voltage detection device is located on the alternating current bus of the power supply system or a link of the alternating current bus of the power supply system connected with the circuit breaker, a detection point of the power detection device is located on the load side of the power supply system, and the controller is respectively connected with the communication module, the battery pack, the alternating current-direct current bidirectional converter, the circuit breaker, the voltage detection module, the temperature and humidity sensor, the power detection module and the communication module, and is connected with the power management PMS unit.
The beneficial effects of the above-mentioned further scheme are: the invention constructs a complete energy storage subsystem, can be quickly connected with the power supply system in an alternating current coupling mode, can realize synchronous grid connection of the energy storage subsystem and the power supply system through voltage detection, and can accurately obtain the load power of each load branch at a high speed by using the power detection module.
Still further, the number of the power detection devices is one or more, and the number of the power detection devices is determined by the number of loads connected to the generator bus.
The beneficial effects of the above-mentioned further scheme are: by the arrangement, the load power of each load branch can be accurately and rapidly obtained.
The invention also provides an energy storage system-based optimal control method, which comprises the following steps:
s1, generating alternating current by using a generator set to supply power to a hybrid power system of the petroleum drilling machine;
s2, converting fixed-frequency alternating current into a variable-frequency power supply by utilizing a frequency converter in the transmission unit, and controlling the operation of the slurry pump, the winch and the top drive motor by the variable-frequency power supply;
s3, judging whether the energy storage subsystem is operated, if so, entering a step S4, otherwise, returning to the step S1;
s4, calculating the power of the energy storage subsystem participating in the optimization control to obtain an optimization given value;
s5, starting the energy storage subsystem to execute the optimized set value, and completing the optimized control of the hybrid power system of the petroleum drilling machine.
The beneficial effects of the invention are as follows: according to the invention, the characteristic of rapid storage and release of electric energy of the energy storage device is utilized, the electric energy generated by the generator is transferred on a certain time scale, the load rate of the power generation system is optimized in real time to be between 70% and 80%, meanwhile, the running time of the generator is further reduced in a mode of alternately supplying power to the battery pack and the generator set in a low-load interval, the total running time of the generator set is reduced, the system efficiency is improved, the fuel consumption is reduced, the fuel cost is further saved, the equipment maintenance cost is further reduced, and the pollutant emission is reduced.
Further, the step S4 includes the steps of:
s401, collecting the load power X of the petroleum drilling machine, calculating to obtain a first given value of energy storage optimized power according to the following formula, judging whether the absolute value of the first given value is larger than a preset threshold, if so, assigning the first given value as 1, entering S402, otherwise, assigning the first given value as 0, and entering S402;
wherein,,Y n representing scan intervalsnIn the inner partYThe value of the sum of the values,Yrepresenting a first given value sent by the power management PMS to the energy storage subsystem,T d the time of the derivative is indicated by the time,T 1 the time of the filtering is indicated and,X n representing scan intervalsnIn the inner partXThe value of the sum of the values,YPT n-1 representing scan intervalsnWithin-1YPTThe value of the sum of the values,YPTrepresentation ofYThe amount of change of (2)XIs used to determine the ratio of the amount of change,YPT n scanning intervalnIn the inner partYPTThe value of the sum of the values,T a representing a sampling time;
s402, collecting a first load rate of a generator set, judging whether the first load rate is larger than a preset first power threshold value, and whether the duration is larger than or equal to a preset first time threshold value, and whether an energy storage subsystem has a discharge condition, if so, calculating to obtain a second given value by the following formula, otherwise, assigning the second given value to be 0;
comparing the first load rate with a preset first power threshold cycle, and if the first load rate of the generator is equal to the preset first power threshold, the expression of the second given value is:
if the first load rate is smaller than a preset first power threshold value, the expression of the second given value is:
if the first load rate is greater than a preset first power threshold, the expression of the second given value is:
wherein,,representing a second given value of the value,Y n-1 representing scan intervalsn-a second given value within 1;
s403, collecting a second load rate of the generator, judging whether the second load rate is smaller than a preset second power threshold value, the duration time is larger than or equal to a second time threshold value, and whether the energy storage subsystem has a discharge condition, if so, calculating according to the following formula to obtain a third given value, otherwise, assigning the third given value to be 0;
and circularly comparing the second load rate with a preset second power threshold value, and if the second load rate is equal to the preset second power threshold value, expressing a third given value as follows:
if the second load rate is smaller than the preset second power threshold, the expression of the third given value is:
if the second load rate is smaller than the preset second power threshold, the expression of the third given value is:
wherein,,representing a third given value of the value,Y n-1 representing scan intervalsn-a second given value within 1;
s404, obtaining an optimized given value according to the sum of the first given value, the second given value and the third given value.
The beneficial effects of the above-mentioned further scheme are: through the design, the invention can enable the generator set to work at the highest-efficiency operation working point, can reduce the impact of drilling load change on the generator set, and prolongs the operation life of the generator set.
Still further, the start-up energy storage subsystem performs an optimization set point, which is specifically:
if the optimized given value is a negative value, charging the battery pack, and lifting the load rate of the generator set to a preset set value; and if the optimized given value is a positive value, discharging the battery pack outwards, and reducing the load rate of the generator set to a preset set value.
The beneficial effects of the above-mentioned further scheme are: the invention applies PMS to coordinate control of the generator set and the energy storage subsystem in the hybrid power system, can improve the system efficiency and reduce the frequency of the generator receiving impact load.
Drawings
Fig. 1 is a schematic diagram of a system structure according to the present invention.
Fig. 2 is a flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Example 1
As shown in fig. 1, the present invention provides an energy storage system-based hybrid power system for an oil rig, comprising:
a power supply subsystem for providing a supply of electrical power to the control system and the drive system;
the control subsystem is used for controlling the operation mode and the cooperative operation mode of the drilling machine by utilizing the power management PMS;
the driving subsystem is used for controlling the driving drilling machine to perform drilling operation based on the operation mode and the cooperative operation mode;
and the energy storage subsystem is used for storing or releasing electricity in real time according to the mode of alternately supplying electricity by using the battery pack and the generator set in a low-load interval based on the operation mode and the cooperative operation mode.
In the embodiment, the power supply system has the functions of synchronous parallel operation, voltage frequency adjustment, automatic starting and stopping and remote control. The control subsystem has functions of remote control of drilling equipment, power limitation of the drilling equipment and monitoring running state of the equipment. The driving subsystem is provided with a mud pump, a top drive, winch frequency conversion speed regulation control and winch electric braking function. The energy storage subsystem has the functions of tripping dynamic assistance, load peak clipping and valley filling, energy storage electric quantity monitoring and early warning and seamless switching of operation modes.
In the embodiment, the energy storage subsystem is added on the original drilling machine hybrid power system, the power management PMS is implemented, and the PMS is applied to coordinate control of the generator set and the energy storage subsystem in the hybrid power system, so that the system efficiency can be improved, the frequency of the generator receiving impact load is reduced, pollutant emission is reduced, and the original system is improved to ensure the power supply continuity and improve the capability of resisting the load impact.
Example 2
For the power supply system in embodiment 1, the power supply system includes a generator set connected to the control subsystem and the drive subsystem, respectively, by cables.
In this embodiment, the power supply system provides a stable supply of electrical power to the transmission unit. The power supply electronic system comprises a generator set, a generator controller and the like, and the generator set is connected with the transmission unit through a cable.
In the embodiment, the invention provides stable electric energy for drilling machine equipment through the modularized integrated generator set.
Example 3
For the control subsystem in embodiment 1, the control subsystem comprises:
the transmission unit is used for converting fixed-frequency alternating current into a variable-frequency power supply, controlling the operation of the slurry pump, the winch and the top drive motor based on a control command, and is connected with the generator set;
the PLC control unit is used for collecting running state signals of the slurry pump, the winch and the top drive, receiving fault alarm signals, and sending control commands to the transmission unit, and has the main functions of equipment running control and state monitoring and communication with the upper drilling machine control unit.
The drilling machine control unit is used for receiving the running state signal transmitted by the PLC control unit, issuing a control instruction to the PLC control unit according to the drilling requirement, acquiring real-time petroleum drilling machine load data and drilling working condition states, and mainly has the functions of visualization of drilling equipment states, man-machine interface, control instruction generation and issuing, power limitation of the drilling equipment and sudden system stop;
the power management PMS unit is used for judging the number of generators required to be operated under the current drilling working condition and the power required to be executed for energy storage based on the real-time petroleum drilling machine load data and the drilling working condition state, outputting the judging result to the generator set and the energy storage subsystem for execution so as to coordinate and schedule the generator set and the energy storage subsystem.
In this embodiment, the main function of the control subsystem is to control the operation mode and the cooperative operation mode of the mud pump, the top drive, the winch and other devices of the drilling machine. The control subsystem comprises a transmission unit, a PLC control unit, a drilling machine control unit and a PMS (power management) unit.
In this embodiment, the generator set supplies power to the control subsystem and the driving subsystem; the transmission unit converts low-voltage alternating current power supply generated by the generator into direct current through the rectification unit, and then converts the direct current power supply into alternating current power supply with controllable current and frequency to drive the alternating current motor.
In the embodiment, the transmission unit adjusts the running speed of the slurry pump, the rotation direction of the winch, the running speed, the rotation direction of the top drive, the running speed and the like according to the instruction after receiving the control command; the mud pump realizes the mud circulation of drilling operation, the top drive motor drives the drill string to rotate, and the winch realizes the lifting and the lowering of the drill string.
In this embodiment, the power management PMS unit and the drilling machine control unit communicate to obtain real-time drilling machine load data and drilling working condition states, and the preset logic is used to judge the number of generators to be operated and the power to be executed for energy storage under the drilling working condition at this time, and output the judging result to the generator set and the energy storage subsystem for execution. The power management PMS unit coordinates and dispatches the generator set and the energy storage subsystem, and charges the energy storage subsystem when the load rate of the generator set is low so as to improve the load rate of the generator set; when the load rate of the generator is high, the energy storage subsystem discharges outwards, so that the load rate of the generator is reduced, and the safety and the load impact resistance of the power supply system are improved.
In the embodiment, the device layer and the system layer are controlled in a layered manner, the functions of all subsystems of the device layer are independent, and meanwhile, the subsystems are coordinated and scheduled by an upper system, so that the operation efficiency and the safety are improved.
Example 4
For the drive system in embodiment 1, the drive system includes a hoist motor, a mud pump motor, an encoder, a top drive, a hoist, and a mud pump;
the output shaft of the mud pump motor is connected with the input shaft of the mud pump through a gear, the output shaft of the winch motor is connected with the input shaft of the winch through a coupling, the encoder is positioned at the tail part and on the top drive of the winch motor, the encoder, the winch motor, the top drive and the mud pump motor are all connected with the transmission unit, and the top drive, the mud pump and the sensing equipment of the winch are all connected with the PLC control unit.
In this embodiment, the main function of the driving subsystem is to drive each device of the drilling machine to act according to the drilling process flow, so as to complete the drilling operation. The driving subsystem comprises a winch motor, a slurry pump motor, an encoder, a top drive, a winch and a slurry pump, wherein an output shaft of the slurry pump motor is connected with an input shaft of the slurry pump through a gear, an output shaft of the winch motor is connected with the input shaft of the winch through a coupling, the encoder is arranged at the tail part of the winch motor, the encoder is arranged on the top drive, the winch motor, the top drive and the slurry pump motor are respectively connected with the transmission system, and the encoder is connected with the control box.
In the embodiment, the full-electric variable-frequency drilling equipment can improve the energy efficiency of the equipment, and meanwhile, the encoder is adopted for closed-loop control, so that the speed control precision is improved, and the drilling process requirements are better met.
Example 5
For the energy storage subsystem in embodiment 1, based on the operation mode and the cooperative operation mode, the method of alternately supplying power to the battery pack and the generator set in the low-load interval is used for storing or releasing electric energy in real time, which specifically includes:
based on the operation mode and the cooperative operation mode, receiving a power management PMS scheduling signal, and charging the battery pack when the load rate of the generator set is lower than a preset set value, so as to raise the load rate of the generator set to the preset set value; and when the load rate of the generator set is higher than a preset set value, discharging the battery pack outwards, and reducing the load rate of the generator set to the preset set value.
In the embodiment, when the load rate of the generator set is low, the energy storage subsystem is charged so as to improve the load rate of the generator set; when the load rate of the generator is high, the energy storage subsystem discharges outwards, so that the load rate of the generator is reduced, and the safety and the load impact resistance of the power supply system are improved.
Example 6
For the energy storage subsystem in embodiment 5, the energy storage subsystem comprises an energy storage room, the energy storage room is connected with the transmission unit through a cable, and the energy storage room comprises an alternating current-direct current-two-way converter, a battery pack, a circuit breaker, a voltage detection device, a power detection device, a communication module, a controller and a temperature and humidity sensor;
the battery pack is connected with the direct current side of the alternating current-direct current bidirectional converter, the alternating current-direct current bidirectional converter is connected with the circuit breaker, the circuit breaker is connected with an alternating current bus of the power supply system, a detection point of the voltage detection device is located on the alternating current bus of the power supply system or a link of the alternating current bus of the power supply system connected with the circuit breaker, a detection point of the power detection device is located on the load side of the power supply system, and the controller is respectively connected with the communication module, the battery pack, the alternating current-direct current bidirectional converter, the circuit breaker, the voltage detection module, the temperature and humidity sensor, the power detection module and the communication module, and is connected with the power management PMS unit.
In this embodiment, the main function of the energy storage subsystem is to store or release electric energy in real time according to a control policy, so as to ensure efficient operation of the whole system. The energy storage subsystem comprises an energy storage room, and the energy storage room is connected with the transmission unit through a cable. The energy storage room comprises an alternating current-direct current bidirectional converter, a battery pack, a circuit breaker, a voltage detection device, a power detection device, a communication module, a controller, a temperature and humidity sensor, an air conditioner, a fire protection system, an illuminating lamp, an alarm lamp and a container. The battery pack is connected with the DC measurement of the AC-DC bidirectional converter; the alternating current-direct current bidirectional converter is connected with the circuit breaker; the breaker is connected with an alternating current bus of the drilling machine power generation system; the detection point of the voltage detection device is positioned on an alternating current bus of a power generation system of the drilling machine or a connecting link of the alternating current bus and the circuit breaker; the detection point of the power detection device is positioned at the load side of the power generation system; the number of the power detection devices can be one or more, and the number of the power detection devices is determined by the number of loads connected to the generator bus. The communication module is connected with each generator controller. The controller is respectively connected with the battery pack, the alternating current-direct current bidirectional converter, the circuit breaker, the voltage detection module, the power detection module, the communication module, the cooling-heating air conditioner and the fire-fighting system.
In the embodiment, the PMS is used for carrying out coordinated control on the generator set and the energy storage subsystem in the hybrid power system, so that the system efficiency can be improved, and the frequency of receiving the impact load by the generator can be reduced.
In the embodiment, a complete energy storage subsystem is constructed, the energy storage subsystem can be quickly connected with the power supply system in an alternating current coupling mode, synchronous grid connection of the energy storage subsystem and the power supply system can be realized through voltage detection, and the load power of each load branch can be accurately obtained at a high speed by the power detection module.
Example 7
For the power detection device in embodiment 6, the number of the power detection devices is one or more, and the number of the power detection devices is determined by the number of loads connected to the generator bus.
The working principle of the invention is as follows: the energy level of the oil drilling machine is mainly determined by the operating point of the generator set in the power supply system, and the higher the load rate of the generator set is, the higher the energy efficiency is. In order to achieve the purpose of optimizing the energy efficiency of the petroleum drilling machine, a power management PMS unit is added in a control subsystem to screen a low-load working point of the power generating set, meanwhile, the characteristics of charging and discharging of an energy storage subsystem are applied, the load rate of the power generating set is judged to be in an low-efficiency area by the power management PMS, the load rate of a generator is improved by charging the energy storage subsystem (wherein the energy storage subsystem executes a charging command according to given power), after the energy storage subsystem is full of the energy storage subsystem, the generator reenters the low-efficiency area, at the moment, the power management PMS unit automatically reduces the number of running generators, so that the power generating set reenters a high-efficiency running interval, the energy storage subsystem reports the residual electric quantity value to the power management PMS unit in real time, and when the residual electric quantity of the energy storage subsystem is insufficient, a generator is started, and the energy storage subsystem enters a charging state. The control subsystem provides a load power limiting safety protection function by reducing the motor speed in the drive subsystem to reduce the load on the generator to ensure that the power supply subsystem does not collapse due to overload. The invention adds a PMS (power management) unit and an energy storage subsystem in the original drilling machine power system, builds a novel drilling machine hybrid power system, and realizes the function of automatic adjustment and optimization of the energy efficiency of the system.
Example 8
As shown in fig. 2, in order to achieve the purpose of optimizing energy efficiency, the invention provides an energy storage system-based optimization control method, which comprises the following steps:
s1, generating alternating current by using a generator set to supply power to a hybrid power system of the petroleum drilling machine;
s2, converting fixed-frequency alternating current into a variable-frequency power supply by utilizing a frequency converter in the transmission unit, and controlling the operation of the slurry pump, the winch and the top drive motor by the variable-frequency power supply;
s3, judging whether the energy storage subsystem is operated, if so, entering a step S4, otherwise, returning to the step S1;
s4, calculating the power of the energy storage subsystem participating in the optimization control to obtain an optimization given value;
s5, starting the energy storage subsystem to execute the optimized set value, and completing the optimized control of the hybrid power system of the petroleum drilling machine.
Example 9
For S4 in embodiment 8, the S4 includes the following steps:
s401, collecting the load power X of the petroleum drilling machine, calculating to obtain a first given value of energy storage optimized power according to the following formula, judging whether the absolute value of the first given value is larger than a preset threshold, if so, assigning the first given value as 1, entering S402, otherwise, assigning the first given value as 0, and entering S402;
wherein,,Y n representing scan intervalsnIn the inner partYThe value of the sum of the values,Yrepresenting a first given value sent by the power management PMS to the energy storage subsystem,T d the time of the derivative is indicated by the time,T 1 the time of the filtering is indicated and,X n representing scan intervalsnIn the inner partXThe value of the sum of the values,YPT n-1 representing scan intervalsnWithin-1YPTThe value of the sum of the values,YPTrepresentation ofYThe amount of change of (2)XIs used to determine the ratio of the amount of change,YPT n scanning intervalnIn the inner partThe value of the sum of the values,T a representing a sampling time;
s402, collecting a first load rate of a generator set, judging whether the first load rate is larger than a preset first power threshold value, and whether the duration is larger than or equal to a preset first time threshold value, and whether an energy storage subsystem has a discharge condition, if so, calculating to obtain a second given value by the following formula, otherwise, assigning the second given value to be 0;
comparing the first load rate with a preset first power threshold cycle, and if the first load rate of the generator is equal to the preset first power threshold, the expression of the second given value is:
if the first load rate is smaller than a preset first power threshold value, the expression of the second given value is:
if the first load rate is greater than a preset first power threshold, the expression of the second given value is:
wherein,,representing a second given value of the value,Y n-1 representing scan intervalsn-a second given value within 1;
s403, collecting a second load rate of the generator, judging whether the second load rate is smaller than a preset second power threshold value, the duration time is larger than or equal to a second time threshold value, and whether the energy storage subsystem has a discharge condition, if so, calculating according to the following formula to obtain a third given value, otherwise, assigning the third given value to be 0;
and circularly comparing the second load rate with a preset second power threshold value, and if the second load rate is equal to the preset second power threshold value, expressing a third given value as follows:
if the second load rate is smaller than the preset second power threshold, the expression of the third given value is:
if the second load rate is smaller than the preset second power threshold, the expression of the third given value is:
wherein,,representing a third given value of the value,Y n-1 representing scan intervalsn-a second given value within 1;
s404, obtaining an optimized given value according to the sum of the first given value, the second given value and the third given value.
Example 10
For S5 in embodiment 8, the start-up energy storage subsystem performs an optimization set point, which is specifically:
if the optimized given value is a negative value, charging the battery pack, and lifting the load rate of the generator set to a preset set value; and if the optimized given value is a positive value, discharging the battery pack outwards, and reducing the load rate of the generator set to a preset set value.
In this embodiment, when the load power fluctuates in real time, the high-frequency part of the load power is captured, and the high-frequency part of the power is used as the power optimization given value to be sent to the energy storage subsystem, and the energy storage subsystem outputs according to the given power. Therefore, the generator set only responds to the low-frequency change load in the load, the load of the generator becomes smooth, the long-time dynamic adjustment process is not easy to occur, and the problems of insufficient air intake, insufficient fuel combustion and low-efficiency operation caused by untimely dynamic adjustment when the large load changes rapidly are solved. And secondly, when the load rate of the generator changes in real time, judging the load rate of the generator in real time, judging the low-voltage set threshold value of the load rate of the generator, and when the low-voltage set threshold value of the load rate of the generator lasts for a certain time, judging that the generator is in a low-efficiency running state, and charging the energy storage subsystem as a load to load the generator until the generator performs a high-efficiency running interval. When the load of the drilling machine is lifted, the energy storage subsystem gradually reduces the charging power, so that the generator continuously works in an efficient operation interval. In another situation, when the load rate of the generator is higher than the safety protection limit value, the PMS starts the rated generator set to maintain the system stable, at the moment, the energy storage subsystem discharges the electricity, the load rate of the generator is reduced, the system safety is ensured and the starting time of the additional generator set is delayed while the efficient operation of the generator set is maintained, so that the aim of improving the system efficiency can be achieved.
Claims (8)
1. An optimization control method of an oil rig hybrid power system based on an energy storage system is characterized in that the oil rig hybrid power system comprises:
a power supply subsystem for providing a supply of electrical power to the control subsystem and the drive subsystem;
the control subsystem is used for controlling the operation mode and the cooperative operation mode of the petroleum drilling machine by utilizing the power management PMS;
the driving subsystem is used for controlling and driving the petroleum drilling machine to perform drilling operation based on the operation mode and the cooperative operation mode;
the energy storage subsystem is used for storing or releasing electric energy in real time in a low-load interval by using a mode of alternately supplying power to the battery pack and the generator set based on an operation mode and a cooperative operation mode;
the optimization control method comprises the following steps:
s1, generating alternating current by using a generator set to supply power to a hybrid power system of the petroleum drilling machine;
s2, converting fixed-frequency alternating current into a variable-frequency power supply by utilizing a frequency converter in the transmission unit, and controlling the operation of the slurry pump, the winch and the top drive motor by the variable-frequency power supply;
s3, judging whether the energy storage subsystem is operated, if so, entering S4, otherwise, returning to S1;
s4, calculating the power of the energy storage subsystem participating in the optimization control to obtain an optimization given value;
the step S4 comprises the following steps:
s401, collecting the load power X of the petroleum drilling machine, calculating to obtain a first given value of energy storage optimized power according to the following formula, judging whether the absolute value of the first given value is larger than a preset threshold, if so, assigning the first given value as 1, entering S402, otherwise, assigning the first given value as 0, and entering S402;
wherein,,Y n representing scan intervalsnIn the inner partYThe value of the sum of the values,Yrepresenting a first given value sent by the power management PMS to the energy storage subsystem,T d the time of the derivative is indicated by the time,T 1 the time of the filtering is indicated and,X n representing scan intervalsnIn the inner partXThe value of the sum of the values,YPT n-1 representing scan intervalsnWithin-1YPTThe value of the sum of the values,YPTrepresentation ofYThe amount of change of (2)XIs used to determine the ratio of the amount of change,YPT n scanning intervalnIn the inner partYPTThe value of the sum of the values,T a representing a sampling time;
s402, collecting a first load rate of a generator set, judging whether the first load rate is larger than a preset first power threshold value, and whether the duration is larger than or equal to a preset first time threshold value, and whether an energy storage subsystem has a discharge condition, if so, calculating to obtain a second given value by the following formula, otherwise, assigning the second given value to be 0;
comparing the first load rate with a preset first power threshold cycle, and if the first load rate of the generator is equal to the preset first power threshold, the expression of the second given value is:
if the first load rate is smaller than a preset first power threshold value, the expression of the second given value is:
if the first load rate is greater than a preset first power threshold, the expression of the second given value is:
wherein,,representing a second given value of the value,Y n-1 representing scan intervalsn-a second given value within 1;
s403, collecting a second load rate of the generator, judging whether the second load rate is smaller than a preset second power threshold value, the duration time is larger than or equal to a second time threshold value, and whether the energy storage subsystem has a discharge condition, if so, calculating according to the following formula to obtain a third given value, otherwise, assigning the third given value to be 0;
and circularly comparing the second load rate with a preset second power threshold value, and if the second load rate is equal to the preset second power threshold value, expressing a third given value as follows:
if the second load rate is smaller than the preset second power threshold, the expression of the third given value is:
if the second load rate is greater than the preset second power threshold, the expression of the third given value is:
wherein,,representing a third given value of the value,Y n-1 representing scan intervalsn-a second given value within 1;
s404, obtaining an optimized given value according to the sum of the first given value, the second given value and the third given value;
s5, starting the energy storage subsystem to execute the optimized set value, and completing the optimized control of the hybrid power system of the petroleum drilling machine.
2. The method for optimizing control of an energy storage system-based oil rig hybrid power system according to claim 1, wherein the starting energy storage subsystem performs an optimization set point, which specifically is:
if the optimized given value is a negative value, charging the battery pack, and lifting the load rate of the generator set to a preset set value; and if the optimized given value is a positive value, discharging the battery pack outwards, and reducing the load rate of the generator set to a preset set value.
3. The method for optimizing control of an energy storage system-based oil rig hybrid power system of claim 1, wherein the power supply system comprises a generator set connected to the control subsystem and the drive subsystem, respectively, via cables.
4. The energy storage system-based oil rig hybrid power system optimization control method of claim 3, wherein the control subsystem comprises:
the transmission unit is used for converting fixed-frequency alternating current into a variable-frequency power supply, controlling the operation of the slurry pump, the winch and the top drive motor based on a control command, and is connected with the generator set;
the PLC control unit is used for collecting running state signals of the slurry pump, the winch and the top drive, receiving fault alarm signals and sending control commands to the transmission unit;
the drilling machine control unit is used for receiving the running state signal transmitted by the PLC control unit, issuing a control instruction to the PLC control unit according to the drilling requirement, and acquiring real-time petroleum drilling machine load data and drilling working condition states;
the power management PMS unit is used for judging the number of generators required to run and the power required to be executed for storing energy under the current drilling working condition based on the real-time petroleum drilling machine load data and the drilling working condition state, and outputting the judging result to the generator set and the energy storage subsystem for executing so as to coordinate and schedule the generator set and the energy storage subsystem.
5. The method of optimizing control of an energy storage system based oil rig hybrid power system of claim 4, wherein the drive subsystem comprises a hoist motor, a mud pump motor, an encoder, a top drive, a hoist, and a mud pump;
the output shaft of the mud pump motor is connected with the input shaft of the mud pump through a gear, the output shaft of the winch motor is connected with the input shaft of the winch through a coupling, the encoder is positioned at the tail part and on the top drive of the winch motor, the encoder, the winch motor, the top drive and the mud pump motor are all connected with the transmission unit, and the top drive, the mud pump and the sensing equipment of the winch are all connected with the PLC control unit.
6. The method for optimizing control of an energy storage system-based hybrid power system of an oil rig according to claim 5, wherein the method for storing or releasing electric energy in real time in a low load interval by alternately supplying power to a battery and a generator set based on an operation mode and a cooperative operation mode is specifically as follows:
based on the operation mode and the cooperative operation mode, receiving a power management PMS scheduling signal, and charging the battery pack when the load rate of the generator set is lower than a preset set value, so as to raise the load rate of the generator set to the preset set value; and when the load rate of the generator set is higher than a preset set value, discharging the battery pack outwards, and reducing the load rate of the generator set to the preset set value.
7. The optimal control method for the energy storage system-based oil rig hybrid power system according to claim 6, wherein the energy storage subsystem comprises an energy storage room, the energy storage room is connected with a transmission unit through a cable, and the energy storage room comprises an alternating current-direct current-two-way converter, a battery pack, a circuit breaker, a voltage detection device, a power detection device, a communication module, a controller and a temperature and humidity sensor;
the battery pack is connected with the direct current side of the alternating current-direct current bidirectional converter, the alternating current-direct current bidirectional converter is connected with the circuit breaker, the circuit breaker is connected with an alternating current bus of the power supply system, a detection point of the voltage detection device is located on the alternating current bus of the power supply system or a link of the alternating current bus of the power supply system connected with the circuit breaker, a detection point of the power detection device is located on the load side of the power supply system, and the controller is respectively connected with the communication module, the battery pack, the alternating current-direct current bidirectional converter, the circuit breaker, the voltage detection module, the temperature and humidity sensor, the power detection module and the communication module, and is connected with the power management PMS unit.
8. The method for optimizing control of an energy storage system based oil rig hybrid power system of claim 7, wherein the number of power detection devices is one or more and the number of power detection devices is determined by the number of loads connected to the generator bus.
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