WO2016052815A1

WO2016052815A1 - Power control device and method for offshore plant

Info

Publication number: WO2016052815A1
Application number: PCT/KR2014/012707
Authority: WO
Inventors: 조세호; 최환서
Original assignee: 대우조선해양 주식회사
Priority date: 2014-10-02
Filing date: 2014-12-23
Publication date: 2016-04-07

Abstract

The present invention relates to a power control device and method for an offshore plant, in which a vessel monitoring and controlling system (VMS) calculates a power limit in accordance with regenerative power and transmits same to a DCS. A power control device for an offshore plant, according to an embodiment of the present invention, comprises a VMS which calculates a power limit of each of a plurality of motors in a drilling apparatus by means of current power consumption, regenerative power stored in a power storage unit, and currently generated power, in an offshore plant; and a drilling apparatus controller which receives from the VMS the power limit of each of the plurality of motors in the drilling apparatus, receives from a worker an input of a command with respect to the drilling apparatus, and transmits to a VFD a power limit signal on the basis of the received power limit and the input command, wherein the power storage unit stores the regenerative power generated from the plurality of motors.

Description

Power Control Device and Method of Offshore Plant

The present invention relates to an apparatus and method for controlling power of an offshore plant. More specifically, the vessel monitoring and control system (VMS) calculates a power limit in consideration of regenerative power and transmits the power to a DCS. It relates to an apparatus and a method for controlling the same.

As the international rapid industrialization and industry develop, the use of resources such as petroleum is gradually increasing. Therefore, stable production and supply of oil is becoming a very important problem at the global level.

For this reason, the development of marginal or deep sea oil fields, which have been neglected in recent years due to lack of economy, has become economic. Therefore, along with the development of the seabed mining technology, the development of offshore plants with drilling equipment suitable for the development of such oil fields is actively progressing.

Offshore plants are equipped with various drilling-related equipment, such as derrick systems, draw works, top drives, mud pumps, cement pumps, risers, and drill pipes, for drilling oil and gas in the seabed below. It is.

Drawworks are equipment for lifting and lowering drill pipes, inserting casings, and the like, including drums and motors. The drum receives power from the motor to regulate the lifting of the drill pipe by winding or unwinding the wire rope. The motor is adjustable in speed to adjust the speed of the drum, thereby adjusting the speed of the drill pipe.

Topdrive is a device that provides power for drilling and pipe fastening in drilling operations.

To prevent overheating and lubrication of the drill bit by the heat generated when the drill bit drills through the ground, a mud is inserted into the drill pipe, which exits through the drill bit and out of the casing Returning to the drilling vessel through the riser and the riser, the mud pump provides a pumping force to transfer the drilling mud stored in the mud tank.

Offshore plants have fixed platforms for anchoring at one point offshore and floating offshore plants capable of drilling in deep waters of over 3,000 meters.

Floating offshore plants are equipped with a plurality of thrusters as propulsion devices for dynamic positioning by a main propulsion device or a computer. The thrusters are propellers installed on the bottom of the ship to change the direction of action of the propellers. These thrusters are normally used to navigate or enter the canal on their own without sailing or tug. The thruster is powered by a thruster motor connected to the thruster.

First, a power supply system of a marine plant according to the prior art will be described with reference to FIG. 1. 1 is a view showing a power supply system of a marine plant according to the prior art. Although one generator and one variable frequency drive (VFD) are shown in FIG. 1, a plurality of generators may be installed in the offshore plant, and three VFDs may be installed. Each of the three VFDs can be installed in port, center and starboard.

As shown in FIG. 1, AC power generated by the generator 110 is supplied to an AC bus, and the first AC / DC converter 121, the second AC / DC converter 122, and the third AC are supplied to the AC bus. The / DC converter 123 is connected.

The first AC / DC converter 121 converts the AC supplied from the AC bus into direct current and supplies the same to the first DC bus 131, and the DC / AC converter 171 is supplied from the first DC bus 131. DC is converted into AC and supplied to the first thruster motor 181.

The second AC / DC converter 122 converts the AC supplied from the AC bus into direct current and supplies it to the second DC bus 132, and the DC / AC converter 172 is supplied from the second DC bus 132. DC is converted into AC and supplied to the second thruster motor 182.

The third AC / DC converter 123 converts the AC supplied from the AC bus into direct current and supplies the same to the third DC bus 133, and the third DC bus 133 includes a plurality of DC / AC converters ( 140 to 149 are connected. Each of the plurality of DC / AC converters 140 to 149 converts direct current supplied from the third DC bus 133 into alternating current so that the plurality of

drawworks motors

150, 151, 152, 158, and 159 are provided. Of the

top drive motors

153 and 154, the plurality of

mud pump motors

155 and 156, and the cement pump motor 157 are supplied to a motor connected thereto.

Next, a power control apparatus of a marine plant according to the prior art will be described with reference to FIG. 2. 2 is a view showing a power control apparatus of a marine plant according to the prior art.

As shown in FIG. 2, a power control apparatus of a marine plant according to the prior art includes a VMS 210, a port VFD 220, a center VFD 230, and a starboard VFD 240.

The VMS 210 compares the generator's production power with the power consumption in the offshore plant and transmits a power limit signal for the drilling rig to the center VFD 230 when the power consumption exceeds 90% of the production power. The center VFD 230 then places a power limit on the drilling rigs connected to the center VFD 230 and no longer increases the power consumption of the drilling rigs. The center VFD 230 transmits the power limit signal received from the VMS 210 to the port VFD 220 and the starboard VFD 240. Port VFD 220 then places a power limit on the drilling rigs connected to port VFD 220 so that power consumption of the drilling rigs no longer increases, starboard VFD 240 is drilled connected to starboard VFD 240. Power limits on the machines no longer increase the power consumption of the drilling machines. Further, the generator is further turned to increase the production power, and when the production power increases, the power limit is released.

The prior art prioritizes thrusters so that when power consumption exceeds 90% of the production power, drilling equipment can no longer increase power consumption, leaving the remaining 10% for the thrusters. However, the power of the drawworks motors and the top drive motors change rapidly due to the characteristics of the operation. Therefore, according to the prior art, even in a temporary power shortage situation in which the power consumption of the drilling equipment is momentarily increased, the power is limited, and thus there is a problem in that power is often limited during the drilling operation. In particular, despite the remaining 10% of the power, there is a problem that the power is limited for the drilling equipment is not used efficiently. In addition, since it takes time for the generator that is in the idle state to produce power, the additional generator may already have a reduced power consumption of the drilling equipment when the power is produced. Therefore, there is also a problem that the additional generator is operated unnecessarily.

Referring back to FIG. 1, since the motors of the drawworks and the motors of the top drive have to repeat the operation of raising and lowering drilling equipment such as a drill pipe, the brakes such as suddenly stopping rotation or rotating in the opposite direction while rotating at the rated speed This often occurs driving feature, and thruster motors also run frequently when braking occurs, such as suddenly stopping the rotation or rotating in the opposite direction to rotate at rated speed for dynamic position control. However, when braking occurs in the motor, regenerative power is generated. In addition, even when the thruster is rotated by disturbance, regenerative power is generated in the thruster motor.

When regenerative power is generated from the drawworks motor, the top drive motor, or the thruster motor, the voltage of the DC bus to which the drawworks motor, the top drive motor, or the thruster motor is connected increases. If the voltage rises above the limit the DC bus can accommodate, the DC bus trips.

Therefore, according to the prior art, resistors 161 to 166 are provided to consume regenerative power as heat to prevent tripping of the DC bus. Therefore, according to the prior art, there is a problem of wasting energy by consuming regenerative power from the resistor.

It is an object of the present invention to provide a power control apparatus and method of an offshore plant that can provide a sufficient power to the drilling equipment can be made stable drilling work, the power can be used efficiently.

In addition, it is an object of the present invention to provide an apparatus and method for controlling power of an offshore plant, which can efficiently use regenerative power and can properly supply power to drilling equipments whose power consumption changes rapidly.

According to an embodiment of the present invention for achieving the above object, in the power control device of the offshore plant, a plurality of drilling equipment using the current production power of the offshore plant, the regenerative power stored in the power storage and the current power consumption A VMS for calculating a power limit for each of the motors of the VMS; And receiving a power limit for each of the plurality of motors of the drilling rig from the VMS, receiving a command for the drilling rig from an operator, and receiving a power limit signal according to the received power limit and the input command. And a drilling rig controller, wherein the power storage unit stores regenerative power generated by the plurality of motors.

In particular, the drilling rig controller may transmit a power limit signal to the VFD when at least one of the plurality of motors requires power consumption exceeding the power limit assigned to it to perform the command.

In addition, the VFD may control the at least one motor such that the power consumption of the at least one motor does not exceed the power limit allocated to the self when the power limit signal is received.

In addition, the VMS receives the current production power from the switch board and receives the regenerative power and the current power consumption stored in the power storage unit from the VFD, the current production power, the regenerative power stored in the power storage unit and the It may include a power management module that calculates the available power using the current power consumption.

Further, the VMS receives the current power consumption of each of the plurality of motors of the drilling rig from the VFD, and the VMS uses the current power and the current power consumption of each of the plurality of motors of the drilling rig. The apparatus may further include a power limit calculation module configured to calculate a power limit for each of the plurality of motors of the drilling equipment and transmit the power limit to the drilling equipment controller.

In addition, the power storage unit may be an ultracapacitor.

The drilling rig controller may also be a drawworks controller.

According to another embodiment of the present invention for achieving the above object, in the power control method of the offshore plant, VMS is available using the current production power of the offshore plant, the regenerative power stored in the power storage and the current power consumption Calculating power; The VMS calculates and transmits a power limit for each of the plurality of motors of the drilling rig to the drilling rig controller using the available power and current power consumption of each of the plurality of motors of the drilling rig. ; Receiving, by the drilling equipment controller, a command for the drilling equipment from an operator; And transmitting, by the drilling equipment controller, a power limit signal to VFD according to the power limit and the input command, wherein the power storage unit stores the regenerative power generated by the plurality of motors. A control method is provided.

In addition, the power control method of the offshore plant includes the step of the VFD receiving the power limit signal; And controlling, by the VFD, the at least one motor such that the power consumption of the at least one motor does not exceed the power limit allocated to the self.

In addition, the power control method of the offshore plant includes the step of the VMS receiving the current production power from the switch board; And receiving, by the VMS, the regenerative power and the current power consumption stored in the power storage unit from the VFD.

In addition, the power storage unit may be an ultracapacitor.

The drilling rig controller may also be a drawworks controller.

According to another embodiment of the present invention for achieving the above object, in the power plant of the offshore plant, the current storage power of each of the port, center and starboard of the offshore plant, power storage of each of the port, center and starboard A VMS that calculates a power limit for each of a plurality of motors of the drilling rig using regenerative power stored in and the current power consumption of each of the port, the center and the starboard; And a drilling rig controller that receives a power limit for each of the plurality of motors of the drilling rig from the VMS and transmits a power limit signal to at least one of port VFD, center VFD, and starboard VFD according to the received power limit. Provided is a power control apparatus for an offshore plant.

In particular, the drilling rig controller receives a command for the drilling rig from an operator, and in order to perform the command, at least one of the plurality of motors requires power consumption exceeding a power limit allocated to the drilling rig controller. In this case, the power limit signal may be transmitted to a VFD to which at least one of the port VFD, the center VFD, and the starboard VFD is connected.

The VMS also receives the current production power of the port from the port switch board, receives the current production power of the center from the center switch board, receives the current production power of the starboard from the starboard switch board, and receives the current production power of the port from the port VFD. Receives the regenerative power stored in the power storage and the current power consumption of the port, and receives the regenerative power stored in the power storage of the center and the current power consumption of the center from the center VFD, from the starboard VFD The stored regenerative power and the current power consumption of the starboard can be received.

In addition, the VMS uses the current production power of each of the port, center and starboard, the regenerative power stored in the power storage of each of the port, center and starboard, and the current power consumption of each of the port, center and starboard, It may include a power management module for calculating the available power of each of the center and the starboard.

The VMS further receives current power consumption of each of a plurality of motors of the drilling rig connected to each of the port VFD, the center VFD and the starboard VFD from the port VFD, the center VFD and the starboard VFD, respectively, The VMS utilizes the available power of each of the port, the center and the starboard and the current power consumption of each of the plurality of motors of the drilling rig connected to the port, the center and the starboard respectively. The apparatus may further include a power limit calculation module configured to calculate a power limit for each of the two and transmit the power limit to the drilling equipment controller.

In addition, the power storage unit may be an ultracapacitor.

The drilling rig controller may also be a drawworks controller.

According to an embodiment of the present invention, sufficient power is supplied to the drilling rig by distributing a portion of the remaining power to the drilling rig, the VMS sends the power limit to the drilling rig controller, and the drilling rig controller performs power limitation in accordance with the power limit. It can supply a stable drilling work can be made, the power can be used efficiently.

In addition, the regenerative power can be efficiently used, and power can be appropriately supplied to drilling equipments in which power consumption changes drastically.

In addition, the reliability of the communication can be increased by connecting the VMS, the drilling equipment controllers and the VFDs to the Fever-ring bus.

In addition, when the drilling equipment controller fails, the entire DCS control unit directly performs power limitation, so that the power limitation may be normally performed even when the drilling equipment controller fails.

1 is a view showing a power supply system of a marine plant according to the prior art.

2 is a view showing a power control apparatus of a marine plant according to the prior art.

3 is a view showing a power supply system of an offshore plant according to an embodiment of the present invention.

FIG. 4 is a detailed view of portion A of FIG. 3.

5 is a view showing the power control apparatus of the offshore plant according to the first and second embodiments of the present invention.

6 is a flowchart illustrating a power control method of a marine plant according to a first embodiment of the present invention.

7 is a flowchart illustrating a power control method of an offshore plant according to a second embodiment of the present invention.

8 is a view showing a power control apparatus of a marine plant according to a third embodiment of the present invention.

9 is a flowchart illustrating a power control method of an offshore plant according to a third embodiment of the present invention.

10 is a view showing the power control device of the offshore plant according to a fourth embodiment of the present invention.

11 is a flowchart illustrating a power control method of a marine plant according to a fourth embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

First, referring to Figures 3 and 4, the power supply system of the offshore plant according to an embodiment of the present invention. 3 is a view showing a power supply system of the offshore plant according to an embodiment of the present invention, Figure 4 is a view showing a portion A in detail in FIG.

As shown in FIG. 3, the offshore plant can be divided into three zones, namely port, center and starboard, and generators, switch boards and VFDs can be installed in each zone. 3 illustrates a case in which two generators and one VFD are installed in each of the port, the center, and the starboard, but the present invention is not limited thereto, and various numbers of generators and VFDs may be installed.

In each zone, the power produced by the generator is supplied to the AC bus, which is powered by the thruster motor and the VFD. The DC bus of the VFD is connected to the motors of the drilling rig, so that the DC bus supplies power to the motors of the drilling rig.

With reference to FIG. 4, the power supply method of a port is demonstrated as an example. The center and starboard are also powered in a manner similar to the port.

As shown in FIG. 4, the power supply system according to the embodiment of the present invention includes a generator 310, an AC / DC converter 320, a DC bus 321, and a variable frequency drive (VFD) controller 330. ), DC / DC converters 351 to 353, DC / AC converters 340 to 349, power loads 360 to 369, power storages 371 to 373, and resistors 381 to 383.

Generator 310 is a device for producing the power required in the offshore plant, is connected to the AC / DC converter 320 via the AC bus. The power produced by the generator 310 may be supplied to the AC / DC converter 320 after being changed to a voltage suitable for use in power loads in the transformer. The generator 310 may produce AC power as an alternator.

The AC / DC converter 320 converts the AC power produced by the generator 310 into direct current and supplies it to the DC bus 321.

The DC bus 321 supplies power to a power load connected to the DC bus 321. The power load using DC power may be directly connected to the DC bus 321, and the power load using AC power may be connected to the DC bus 321 through the DC / AC converters 340 to 349.

The power loads 360 to 369 shown in FIG. 4 are power loads using AC power and are connected to the DC bus 321 through the DC / AC converters 340 to 349. The DC / AC converters 340 to 349 convert the direct current supplied from the DC bus 321 into alternating current and supply them to the power loads 360 to 369.

Each of the power loads 360-369 may be one of a drawworks motor, a top drive motor, a mud pump motor, and a cement pump motor. As shown in FIG. 3, two drawworks, two top drives, four mud pumps and two cement pumps may be installed in the offshore plant, and each of the two drawworks is connected to seven motors. Each of the top drives is connected to two motors, each of the four mud pumps is connected to two motors, one of the two cement pumps is connected to two motors, and the other is connected to one motor. Can be. The number of drawworks, top drives, mud pumps and cement pumps and the number of drawworks motors, top drive motors, mud pump motors and cement pump motors are exemplary, and the present invention is not limited thereto.

3 and 4, the DC bus 321 of the port VFD has three motors 360 to 362 of the main drawworks, two top drive motors 363 to 364, and two mud pump motors 365 as power loads. To 366), one cement pump motor 367 and two auxiliary drawworks motors 368 to 369 are connected to the DC bus of the center VFD and the two main drawworks motors and mud pumps as power loads. Four motors, one cement pump motor, and two auxiliary drawworks motors are connected, and the starboard VFD's DC bus has two main drawworks motors, three auxiliary drawworks motors, and top drive as power loads. Two motors, two mud pump motors and one cement pump motor are connected.

Since drawworks raises and lowers drilling equipment such as drill pipes, the drawworks motor rotates at rated speed and stops rotation suddenly or rotates in the opposite direction. Regenerative power is generated in the motor.

The top drive is a device that provides power for drilling and pipe fastening in the drilling operation, the motor of the top drive also rotates to the rated speed, the braking occurs frequently, such as sudden stop or rotation in the opposite direction to generate the regenerative power.

The power storage units 371 to 373 store power by receiving power from the DC bus 321 when the voltage of the DC bus 321 maintains the first threshold or more for a first time, and stores the power, and the voltage of the DC bus 321. Maintaining below the second threshold for this second time provides power to the DC bus 321. For example, assuming that the DC bus 321 is for 720V and tripped when it is greater than 750V, the first threshold may be set to 740V.

The DC / DC converters 351 to 353 measure the voltage of the DC bus 321 and supply power from the DC bus 321 to the power storage units 371 to 373 when the voltage of the DC bus 321 is maintained above the first threshold for the first time. If power is stored in the power storages 371 to 373, and the voltage of the DC bus 321 remains below the second threshold for a second time, the power is stored from the power storages 371 to 373 to the DC bus 321. This flow allows power to be supplied from the power storages 371 to 373 to the DC bus 321.

When regenerative power is generated in the power loads 360 to 364 and 368 to 369, the voltage of the DC bus 321 rises, and when the power consumption of the power loads 360 to 364, 368 to 369 suddenly rises, Voltage drops

That is, when regenerative power is generated in the power loads 360 to 364 and 368 to 369, the voltage of the DC bus 321 goes up, and if the voltage of the DC bus 321 remains above the first threshold for a first time, DC / Regenerative power generated from the power loads 360 to 364 and 368 to 369 by supplying power to the power storage units 371 to 373 by the DC converters 351 to 353 to supply power to the power storage units 371 to 373. Power is stored in the power storages 371 to 373.

When the power consumption of the power loads 360 to 364 and 368 to 369 suddenly rises, the voltage of the DC bus 321 goes down, and if the voltage of the DC bus 321 remains below the second threshold for a second time, the DC The / DC converters 351 to 353 allow power to flow from the power storages 371 to 373 to the DC bus 321 so that power is supplied from the power storages 371 to 373 to the DC bus 321. The power storages 371 to 373 may be at least one of an ultracapacitor, a capacitor, a battery, and a flywheel. In particular, when the power storage units 371 to 373 are ultracapacitors, when the power consumption of the power loads 360 to 364 and 368 to 369 suddenly rises since the response speed of the ultracapacitor is higher than that of the generator 310, the power load ( 360 to 364, 368 to 369 can be quickly supplied power.

Also, the power storage units 371 to 373 supply power to the DC bus 321 even in a transient state or a power failure. When the sensor 391 that detects a transient state or a power outage detects a transient state or a power outage, the sensing signal is transmitted to the DC / DC converters 351 to 353, and the DC / DC converters 351 to 353 power storage unit 371. To power from the 373 to the DC bus 321.

The sensor 391 may be installed in at least one of the switch board and the DC bus 321.

Drilling equipment such as drawworks and topdrives can cause dangerous situations if the power supply is suddenly interrupted. Thus, in the event of a transient or power outage, the power storages 371 to 373 supply power to the DC bus 321 so that the drilling equipment can be safely shut down.

The resistors 381 to 383 consume power when the voltage of the DC bus 321 remains above the first threshold for a third time. At this time, the third time is a longer time than the first time.

When regenerative power occurs in the power loads 360 to 364 and 368 to 369, the power storage units 371 to 373 store the power when the voltage of the DC bus 321 rises and maintains the first threshold or more for the first time. . In addition, when the capacity of the power storage units 371 to 373 is full, the voltage of the DC bus 321 does not drop and continues to maintain the first threshold or more. Therefore, it may be determined that the voltage of the power storage units 371 to 373 is full that the voltage of the DC bus 321 maintains the first threshold or more for the third time. However, when regenerative power continues to occur in a state where the power storage units 371 to 373 are full, the voltage of the DC bus 321 may continue to increase, causing the DC bus 321 to trip. Therefore, when the voltage of the DC bus 321 is maintained above the first threshold for a third time, the DC / DC converters 351 to 353 cause the resistors 381 to 383 to consume power.

Although three power storage units 371 to 373 and three resistor units 381 to 383 are illustrated in FIG. 3, the present invention is not limited thereto and may include various numbers of power storage units and resistor units.

Next, a power control apparatus of an offshore plant according to a first embodiment of the present invention will be described with reference to FIG. 5. 5 is a view showing the power control apparatus of the offshore plant according to the first and second embodiments of the present invention.

As shown in FIG. 5, the power control apparatus of the offshore plant according to the first embodiment of the present invention includes a VMS 510, a drilling rig controller 521 to 528, a port VFD 530, a center VFD 540, and Starboard VFD 550.

The VMS 510 calculates a power limit for each of the plurality of motors of each of the plurality of drilling rigs, taking into account the amount of current production power and the current power consumption of the offshore plant, thereby controlling the plurality of drilling rig controllers. To each of the fields 521 to 528. As shown in FIG. 5, the VMS 510 and the plurality of drilling rig controllers 521-528 are connected by a ring bus, and the VMS 510 is bidirectional, ie clockwise and counterclockwise. Send a power limit. A bus is a transmission path for data transmission between various signal sources, and a ring bus is a bus in which each node is connected with two adjacent nodes to form one continuous path as a ring. According to the first embodiment of the present invention, the VMS 510 and the plurality of drilling rig controllers 521 to 528 are connected by a ring bus, and the VMS 510 transmits a power limit in both directions so that one direction is used. Even in this failure, the power limit can be transferred in the other direction, thereby increasing the reliability of the communication. At this time, the ring bus is a fiber-ring bus to transmit and receive data in optical communication between the VMS 510 and the plurality of drilling equipment controllers 521 to 528.

At this time, the VMS 510 is connected to the VFD of each of the port, center and starboard in consideration of the amount of current production power and the current power consumption of each of the zones of the offshore plant, for example, the port, center and starboard. A power limit for each of the motors can be calculated and sent to each of the plurality of drilling rig controllers 520. That is, referring to the system of FIG. 3 as an example, the VMS 510 may include three motors of main drawworks connected to the VFD of the port in consideration of the amount of current production power of the port and the amount of current consumption of the port, Calculate the power limits for each of the two motors of the auxiliary drawworks, the motor of the main top drive, the motor of the auxiliary top drive, the two motors of the second mud pump, and the motor of the first cement pump. The VMS 510 then transmits a power limit for each of the three motors of the main drawworks to the main drawworks controller, and sends a power limit for each of the two motors of the auxiliary drawworks to the auxiliary drawworks. Transmit to the controller, transmit power limit for the motor of the main top drive to the main top drive controller, transfer power limit for the motor of the secondary top drive to the secondary top drive controller, and two motors of the second mud pump The power limit for each is sent to the second mud pump controller and the power limit for the motor of the first cement pump is sent to the first cement pump controller.

As shown in FIG. 5, the VMS 510 includes a power management module 511 and a power limit calculation module 512.

The power management module 511 receives the amount of current production power from the switch board, receives the amount of current power consumption from the VFD, and uses the amount of current production power and the amount of current power consumption to determine the amount of power available. Calculate and transmit to the power limit calculation module 512. In this case, the power management module 511 may receive an amount of current power consumption of each of the motors connected to the VFD from the VFD controller of the VFD.

The power management module 511 receives the amount of current production power of the port, center and starboard respectively from the switchboards of the port, center and starboard respectively, and the VFD of the port, center and starboard respectively from the VFDs of the port, center and starboard respectively. Receiving an amount of current power consumption of each of the motors of the plurality of drilling rigs connected to the, it is possible to calculate the amount of available power of each of the port, center and starboard. At this time, the power management module 511 is a sum of the current power consumption of each of the motors of the plurality of drilling equipment connected to the VFD of each of the port, center and starboard from the amount of current production power of each of the port, center and starboard, that is, the port The amount of usable power of each of the port, center and starboard may be calculated by subtracting the amount of current power consumption of each of the center, starboard and starboard. The power management module 511 may send the amount of available power of each of the port, center and starboard to the power limit calculation module 512.

The power limit calculation module 512 calculates a power limit for each of the motors of the plurality of drilling rigs by considering the amount of available power and the amount of current power consumption of each of the motors of the plurality of drilling rigs. Each of the plurality of drilling rig controllers 521-528 transmits through a ring bus.

At this time, the power limit calculation module 512 uses the amount of available power of each of the port, center and starboard and the amount of current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD of each of the port, center and starboard. A power limit for each of the plurality of motors of each of the plurality of drilling rigs may be calculated and transmitted to each of the plurality of drilling rig controllers 521-528.

The power limit calculation module 512 divides the amount of available power of each of the port, center and starboard by the number of motors of the plurality of drilling rigs connected to the VFDs of the port, center and starboard respectively. The power limit for each of the motors of the plurality of drilling rigs can be calculated by summing up the current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD. For example, in Fig. 3, if the amount of available power of the port is A, since there are 10 motors connected to the VFD of the port, the power limit calculation module 512 may calculate the current of each of the motors connected to the VFD of the port. The sum of the amount of power consumed and A / 10 can be determined as the power limit for each of the motors connected to the port's VFD.

Alternatively, the power limit calculation module 512 divides the amount of available power of the port, center and starboard by the number of motors in operation among the motors of the plurality of drilling rigs connected to the VFDs of the port, center and starboard, respectively. The power limit for each of the motors of the plurality of drilling rigs can be calculated by summing with the current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD of each of the port, center and starboard. For example, in Figure 3, the amount of available power of the port is called A, and if four of the ten motors connected to the port's VFD are running, then the power limit calculation module 512 is connected to the port's VFD. The sum of the current power consumption and A / 4 of each of the motors can be determined as the power limit for each of the motors connected to the VFD in the port.

Each of the drilling rig controllers 521 to 528 receives a power limit for each of the motors of the drilling rig it controls from the VMS 510, receives a command for the drilling rig from an operator, and receives Transmits a power limit signal to the VFD according to the received power limit and input command. At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. The power limit signal can be transmitted. As shown in FIG. 5, the drilling rig controllers 521-528 and the

VFDs

530, 540, 550 are connected via a ring bus so that the drilling rig controllers 521-528 are connected via a ring bus. Transmit power limit signal.

Drilling equipment controller 520 controls the equipment related to drilling. Drilling involves drilling holes in the seabed to extract resources. Drilling equipment includes drawworks, top drives, mud pumps and cement pumps. Thus, the drilling rig controller 520 may be a drawworks controller, a top drive controller, a mud pump controller, a cement pump controller.

The drawworks are driven by the drawworks motor, the top drive is driven by the top drive motor, the mud pump is driven by the mud pump motor, and the cement pump is driven by the cement pump motor.

The drawworks controller controls drawworks related equipment such as drawworks motors, the topdrive controller controls topdrive related equipments such as topdrive motors, and the mud pump controller is a mud pump related equipment such as mud pump motors. And the cement pump controller controls cement pump related equipment such as cement pump motor. The drawworks controller, the top drive controller, the mud pump controller, and the cement pump controller may constitute a drilling control system (DCS).

Port VFD 530, center VFD 540, and starboard VFD 550 receive a power limit signal to prevent the received power limit signal from exceeding its power limit so that the power consumption of the motor requesting power limit does not exceed its power limit. To control.

Next, the power control method of the offshore plant according to the first embodiment of the present invention with reference to FIG. 6 is a flowchart illustrating a power control method of a marine plant according to a first embodiment of the present invention.

The power management module 511 receives the amount of current production power from the switch board (S610), receives the amount of current power consumption from the VFD (S620), and uses the amount of current production power and the amount of current power consumption. The amount of available power is calculated and transmitted to the power limit calculation module 512 (S630).

The power limit calculation module 512 calculates and transmits the power limit for each of the motors of the drilling rig to the drilling rig controller 520 using the amount of available power and the current power consumption of each of the motors of the drilling rig. (S640). At this time, the power limit calculation module 512 transmits the power limit through the ring bus.

The drilling rig controller 520 receives a power limit for each of the motors of the drilling rig that it controls from the VMS 510, receives a command for the drilling rig from an operator (S650), and receives the received power. The power limit signal is transmitted to the VFD according to the limit and the input command (S660). At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. Power-limit signals can be sent over the local ring bus.

When the VFD receives the power limit signal, the VFD controls the corresponding motor such that the power consumption of the motor for which the received power limit signal requests power limitation does not exceed its power limit (S670).

Next, a power control apparatus of an offshore plant according to a second embodiment of the present invention will be described with reference to FIG. 5.

As shown in FIG. 5, the power control apparatus of the offshore plant according to the second embodiment of the present invention includes a VMS 510, a drilling equipment controller 520, a port VFD 530, a center VFD 540, and a starboard VFD. 550.

The VMS 510 calculates a power limit for each of the plurality of motors of each of the plurality of drilling rigs, taking into account the amount of current production power and the current power consumption of the offshore plant, thereby controlling the plurality of drilling rig controllers. To each of them 520. Although one drilling rig controller is shown in FIG. 5, this shows one drilling rig for convenience of illustration, the VMS 510 is a plurality of drilling rig controllers 520 for each of the drilling rig motors. The power limit can be sent.

The power limit calculation module 512 calculates a power limit for each of the motors of the plurality of drilling rigs by considering the amount of available power and the amount of current power consumption of each of the motors of the plurality of drilling rigs. And send to each of the plurality of drilling rig controllers 520.

At this time, the power limit calculation module 512 uses the amount of available power of each of the port, center and starboard and the amount of current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD of each of the port, center and starboard. A power limit for each of the plurality of motors of each of the plurality of drilling rigs may be calculated and transmitted to each of the plurality of drilling rig controllers 520.

Alternatively, the power limit calculation module 512 divides the amount of available power of the port, center and starboard by the number of motors in operation among the motors of the plurality of drilling rigs connected to the VFDs of the port, center and starboard, respectively. The power limit for each of the motors of the plurality of drilling rigs can be calculated by summing up the current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD of each of the port, center and starboard. For example, in Figure 3, the amount of available power of the port is called A, and if four of the ten motors connected to the port's VFD are running, then the power limit calculation module 512 is connected to the port's VFD. The sum of the current power consumption and A / 4 of each of the motors can be determined as the power limit for each of the motors connected to the VFD in the port. At this time, the VMS 510 may receive the number of motors in operation from the drilling rig controller 520.

The drilling rig controller 520 receives a power limit for each of the motors of the drilling rig that it controls from the VMS 510, receives a command for the drilling rig from an operator, and receives the received power limit and input. Transmits the power limit signal to the VFD according to the specified command. At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. The power limit signal can be transmitted.

Next, the power control method of the offshore plant according to the second embodiment of the present invention will be described with reference to FIG. 7 is a flowchart illustrating a power control method of an offshore plant according to a second embodiment of the present invention.

The power management module 511 receives the amount of current production power from the switch board (S710), receives the amount of current power consumption from the VFD (S720), and uses the amount of current production power and the amount of current power consumption. The amount of available power is calculated and transmitted to the power limit calculation module 512 (S730).

The power limit calculation module 512 calculates and transmits the power limit for each of the motors of the drilling rig to the drilling rig controller 520 using the amount of available power and the current power consumption of each of the motors of the drilling rig. (S740).

At this time, the power limit calculation module 512 divides the amount of available power of the port, center and starboard by the number of motors in operation among the motors of the plurality of drilling equipment connected to the VFDs of the port, center and starboard, respectively. The power limit for each of the motors of the plurality of drilling rigs can be calculated by summing up the current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD of each of the port, center and starboard.

The drilling rig controller 520 receives a power limit for each of the motors of the drilling rig it controls from the VMS 510, receives a command for the drilling rig from an operator (S750), and receives the received power. The power limitation signal is transmitted to the VFD according to the limit and the input command (S760). At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. The power limit signal can be transmitted.

When the VFD receives the power limit signal, the VFD controls the corresponding motor such that the received power limit signal does not exceed its power limit.

Next, a power control apparatus of an offshore plant according to a third embodiment of the present invention will be described with reference to FIG. 8. 8 is a view showing a power control apparatus of an offshore plant according to a third embodiment of the present invention.

As shown in FIG. 8, the power control apparatus of the offshore plant according to the third embodiment of the present invention includes a VMS 510, drilling equipment controllers 521 to 528, port VFD 530, center VFD 540 and Starboard VFD 550.

The VMS 510 calculates a power limit for each of the plurality of motors of each of the plurality of drilling rigs, taking into account the amount of current production power and the current power consumption of the offshore plant, thereby controlling the plurality of drilling rig controllers. To each of the fields 521 to 528. As shown in FIG. 8, the VMS 510 and the plurality of drilling rig controllers 521 to 528 are connected by a ring bus, and the VMS 510 is bidirectional, that is, clockwise and counterclockwise. Send a power limit. A bus is a transmission path for data transmission between various signal sources, and a ring bus is a bus in which each node is connected with two adjacent nodes to form one continuous path as a ring. According to the third embodiment of the present invention, the VMS 510 and the plurality of drilling rig controllers 521 to 528 are connected by a ring bus, and the VMS 510 transmits a power limit in both directions so that one direction Even in this failure, the power limit can be transferred in the other direction, thereby increasing the reliability of the communication. At this time, the ring bus is a fiber-ring bus to transmit and receive data in optical communication between the VMS 510 and the plurality of drilling equipment controllers 521 to 528.

As shown in FIG. 8, the VMS 510 includes a power management module 511 and a power limit calculation module 512.

Each of the drilling rig controllers 521 to 528 receives a power limit for each of the motors of the drilling rig it controls from the VMS 510, receives a command for the drilling rig from an operator, and receives Transmits a power limit signal to the VFD according to the received power limit and input command. At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. The power limit signal can be transmitted. As shown in FIG. 8, the drilling rig controllers 521-528 and the

VFDs

Next, a power control method of a marine plant according to a third embodiment of the present invention will be described with reference to FIG. 9. 9 is a flowchart illustrating a power control method of an offshore plant according to a third embodiment of the present invention.

The power management module 511 receives the amount of current production power from the switch board (S910), receives the amount of current power consumption from the VFD (S920), and uses the amount of current production power and the amount of current power consumption. The amount of available power is calculated and transmitted to the power limit calculation module 512 (S930).

The power limit calculation module 512 calculates and transmits the power limit for each of the motors of the drilling rig to the drilling rig controller 520 using the amount of available power and the current power consumption of each of the motors of the drilling rig. (S940). At this time, the power limit calculation module 512 transmits the power limit through the ring bus.

The drilling rig controller 520 receives a power limit for each of the motors of the drilling rig it controls from the VMS 510, receives a command for the drilling rig from an operator (S950), and receives the received power. The power limit signal is transmitted to the VFD according to the limit and the input command (S960). At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. Power-limit signals can be sent over the local ring bus.

When the VFD receives the power limit signal, the VFD controls the corresponding motor such that the power consumption of the received power limit signal does not exceed its power limit (S970).

Next, a power control apparatus of an offshore plant according to a fourth embodiment of the present invention will be described with reference to FIG. 10. 10 is a view showing the power control device of the offshore plant according to a fourth embodiment of the present invention.

As shown in FIG. 10, the power control apparatus of the offshore plant according to the fourth embodiment of the present invention includes a VMS 510, a drilling control system (DCS) overall controller 560, a drilling rig controller 520, and a port VFD. 530, center VFD 540 and starboard VFD 550.

The VMS 510 calculates a power limit for each of the plurality of motors of each of the plurality of drilling rigs in consideration of the amount of current production power and the current power consumption of the offshore plant, thereby calculating the DCS overall control unit 560. To send).

At this time, the VMS 510 is connected to the VFD of each of the port, center and starboard in consideration of the amount of current production power and the current power consumption of each of the zones of the offshore plant, for example, the port, center and starboard. The power limit for each of the motors may be calculated and transmitted to the DCS overall controller 560. That is, referring to the system of FIG. 3 as an example, the VMS 510 may include three motors of main drawworks connected to the VFD of the port in consideration of the amount of current production power of the port and the amount of current consumption of the port, Calculate the power limits for each of the two motors of the auxiliary drawworks, the motor of the main top drive, the motor of the auxiliary top drive, the two motors of the second mud pump, and the motor of the first cement pump.

As shown in FIG. 10, the VMS 510 includes a power management module 511 and a power limit calculation module 512.

The power limit calculation module 512 calculates a power limit for each of the motors of the plurality of drilling rigs by considering the amount of available power and the amount of current power consumption of each of the motors of the plurality of drilling rigs. The DCS is transmitted to the overall controller 560.

At this time, the power limit calculation module 512 uses the amount of available power of each of the port, center and starboard and the amount of current power consumption of each of the motors of the plurality of drilling rigs connected to the VFD of each of the port, center and starboard. A power limit for each of the plurality of motors of each of the plurality of drilling equipments may be calculated and transmitted to the DCS overall controller 560.

The DCS overall control unit 560 is a part of controlling the DCS as a whole, and monitors and controls the drilling rig controllers 520, that is, the drawworks controller, the top drive controller, the mud pump controller, and the cement pump controller.

The DCS overall controller 560 receives the power limit for each of the motors of the drilling rigs from the VMS 510 and transmits it to the corresponding drilling rig controller 520. Although one drilling rig controller is shown in FIG. 5, this shows one drilling rig for convenience of illustration, the DCS overall control unit 560 is a plurality of drilling rig controllers 520 each of the motors of the drilling rig. May transmit a power limit for.

The drilling rig controller 520 receives a power limit for each of the motors of the drilling rig it controls from the DCS overall control unit 560 and performs power limitation according to the received power limit. That is, it receives a command for the drilling equipment from the operator, and transmits a power limit signal to the VFD according to the received power limit and the input command. At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. The power limit signal can be transmitted.

The DCS overall controller 560 does not transmit a power limit to the drilling rig controller 520 when the drilling rig controller 520 does not operate normally, and performs power limitation according to the power limit. That is, it receives a command for the drilling equipment from the operator, and transmits a power limit signal to the VFD according to the power limit and the input command. At this time, the DCS overall control unit 560 is a VFD connected to the at least one motor when the power consumption exceeds the power limit assigned to at least one of the motors of the drilling rig in order to perform the input command The power limit signal can be transmitted.

Next, the power control method of the offshore plant according to the fourth embodiment of the present invention will be described with reference to FIG. 11 is a flowchart illustrating a power control method of a marine plant according to a fourth embodiment of the present invention.

The power management module 511 receives the amount of current production power from the switch board (S1110), receives the amount of current power consumption from the VFD (S1120), and uses the amount of current production power and the amount of current power consumption. The amount of available power is calculated and transmitted to the power limit calculation module 512 (S1130).

The power limit calculation module 512 calculates the power limit for each of the motors of the drilling rig using the amount of available power and the current power consumption of each of the motors of the drilling rig, and sends it to the DCS overall controller 560. (S1140).

The DCS overall controller 560 monitors the drilling rig controller 520 to determine whether the drilling rig controller 520 operates normally (S1150).

When the drilling rig controller 520 operates normally, the DCS overall controller 560 transmits a power limit for each of the motors of the drilling rig to the drilling rig controller 520 (S1161). Then, the drilling rig controller 520 receives a command for the drilling rig from the operator (S1171), and transmits a power limit signal to the VFD according to the received power limit and the input command (S1181). At this time, the drilling rig controller 520 is connected to the VFD when at least one of the motors of the drilling rig requires power consumption exceeding the power limit allocated to the drilling rig controller 520 to perform the input command. The power limit signal can be transmitted.

When the drilling rig controller 520 does not operate normally, the DCS overall control unit 560 receives a command for the drilling rig from the operator (S1162), and transmits a power limit signal to the VFD according to the received power limit and the input command. (S1172).

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

In the power control device of the offshore plant,

A VMS for calculating a power limit for each of a plurality of motors of a drilling rig using the current production power of the offshore plant, the regenerative power stored in the power storage unit, and the current power consumption; And

Receives a power limit for each of the plurality of motors of the drilling rig from the VMS, receives a command for the drilling rig from an operator, and transmits a power limit signal to the VFD according to the received power limit and the input command. A drilling rig controller for transmitting,

The power storage unit stores the regenerative power generated by the plurality of motors, power control device of the offshore plant.
The method according to claim 1,

The drilling rig controller transmits a power limit signal to the VFD when at least one of the plurality of motors requires a power consumption exceeding the power limit assigned to it to perform the command. Power control unit.
The method according to claim 2,

And the VFD controls the at least one motor such that the power consumption of the at least one motor does not exceed the power limit allocated to the at least one motor upon receiving the power limit signal.
The method according to claim 1,

The VMS receives the current production power from the switch board and receives the regenerative power stored in the power storage unit and the current power consumption from the VFD, thereby generating the current production power, the regenerative power stored in the power storage unit, and the current consumption. A power control device for an offshore plant, comprising a power management module that calculates available power using power.
The method according to claim 4,

The VMS receives a current power consumption of each of the plurality of motors of the drilling rig from the VFD,

The VMS calculates a power limit for each of the plurality of motors of the drilling rig using the available power and current power consumption of each of the plurality of motors of the drilling rig to calculate and transmit the power limit to the drilling rig controller. Further comprising a module, the power control device of the offshore plant.
The method according to claim 1,

The power storage unit is an ultracapacitor, the power control device of the offshore plant.
The method according to claim 1,

Wherein said drilling rig controller is a drawworks controller.
In the power control method of the offshore plant,

Calculating, by the VMS, the available power using the current production power of the offshore plant, the regenerative power stored in the power storage, and the current power consumption;

The VMS calculates and transmits a power limit for each of the plurality of motors of the drilling rig to the drilling rig controller using the available power and current power consumption of each of the plurality of motors of the drilling rig. ;

Receiving, by the drilling equipment controller, a command for the drilling equipment from an operator; And

The drilling equipment controller transmitting a power limit signal to a VFD in accordance with the power limit and the input command,

The power storage unit of the offshore plant power control method for storing the regenerative power generated by the plurality of motors.
The method according to claim 8,

The drilling rig controller transmits a power limit signal to the VFD when at least one of the plurality of motors requires a power consumption exceeding the power limit assigned to it to perform the command. Power control method.
The method according to claim 9,

The VFD receiving the power limit signal; And

And the VFD controlling the at least one motor such that the power consumption of the at least one motor does not exceed the power limit allocated to the at least one motor.
The method according to claim 8,

The VMS receiving the current production power from a switch board; And

The VMS further comprises the step of receiving the regenerative power and the current power consumption stored in the power storage unit from the VFD.
The method according to claim 8,

The power storage unit is an ultracapacitor, the power control device of the offshore plant.
The method according to claim 8,

And said drilling rig controller is a drawworks controller.
In the power control device of the offshore plant,

A plurality of drilling equipment using the current production power of each of the port, center and starboard of the offshore plant, the regenerative power stored in the power storage of each of the port, center and starboard and the current power consumption of each of the port, center and starboard A VMS for calculating a power limit for each of the motors of the VMS; And

A drilling rig controller that receives a power limit for each of the plurality of motors of the drilling rig from the VMS and transmits a power limit signal to at least one of port VFD, center VFD, and starboard VFD according to the received power limit. Power control device for offshore plant.
The method according to claim 14,

The drilling rig controller receives a command for the drilling rig from an operator, and in order to perform the command when at least one of the plurality of motors requires power consumption exceeding the power limit allocated to the drilling rig controller. And a power limit signal to a VFD to which at least one of the port VFD, the center VFD, and the starboard VFD is connected.
The method according to claim 14,

The VMS receives the current production power of the port from the port switch board, receives the current production power of the center from the center switch board, receives the current production power of the starboard from the starboard switch board, and stores the power of the port from the port VFD. Receives the regenerative power stored in the unit and the current power consumption of the port, and receives the regenerative power stored in the center power storage unit and the current power consumption of the center from the center VFD, and regeneration stored in the power storage unit of the starboard from the starboard VFD A power control device for an offshore plant, receiving power and current power consumption of starboard.
The method according to claim 14,

The VMS uses the current production power of each of the port, center and starboard, the regenerative power stored in the power storage of each of the port, center and starboard, and the current power consumption of each of the port, center and starboard. And a power management module for calculating the available power of each of the starboards.
The method according to claim 17,

The VMS receives current power consumption of each of a plurality of motors of the drilling rig connected to each of the port VFD, the center VFD and the starboard VFD from each of the port VFD, the center VFD and the starboard VFD,

The VMS utilizes a plurality of power sources of the drilling rig using current power of each of the plurality of motors of the drilling rig connected to the port, the center and the starboard and the available power of each of the port, the center and the starboard. And a power limit calculation module for calculating and sending power limits for each of the motors to the drilling rig controller.
The method according to claim 14,

The power storage unit is an ultracapacitor, the power control device of the offshore plant.
The method according to claim 19,

Wherein said drilling rig controller is a drawworks controller.