Controllable rectifier dc transmission oil drilling rig hybrid power system

Abstract

The utility model discloses a controllable rectification DC power transmission petroleum drilling machine hybrid power system, including generator unit, public DC bus, energy storage battery group, water -cooled inverter drive unit, total controller, central controller, brake unit, converter unit, the power transmission end of multiple generator unit is connected to the power receiving end of public DC bus, and public DC bus connects energy storage battery group, and the power transmission end of public DC bus is connected to the power receiving end of multiple water -cooled inverter drive unit respectively, and water -cooled inverter drive unit is connected to the load power receiving end of petroleum drilling machine, still be connected with brake unit and converter unit on public DC bus, the VCU controller of every generator unit is connected through CAN communication bus of central controller, and central controller still communication connection, BMS system in energy storage battery group, water -cooled inverter drive unit and total controller, can overcome the existing drilling system installed cost high, maintenance cost is higher, and the problem that power grid quality is greatly interfered, equipment volume is big, system efficiency is low.

Description

Technical Field

[0001] This utility model relates to the field of power control technology for oil drilling networks, and in particular to a controllable rectified DC power transmission hybrid power system for oil drilling rigs. Background Technology

[0002] Traditional power and drive systems for oil drilling rigs are categorized into mechanical drilling rigs, grid-powered drilling rigs, and electric drilling rigs. Mechanical drilling rigs typically use multiple diesel engines connected in parallel via chain boxes or motors to drive the drilling equipment. Grid-powered drilling rigs usually use a single high-power electric motor to replace the original diesel engine and power the chain box or motor; the motor is a separate skid. Electric drilling rigs use high-power diesel generator sets to provide system power, driving the drilling equipment via DC speed regulation or AC frequency conversion motors, achieving stepless speed regulation of the workpiece and improving system safety. In recent years, grid power upgrades and electric drilling rigs have developed rapidly, progressing from fixed-frequency motor drives to DC motor drives and then to AC frequency conversion motor drives, making a significant contribution to reducing oil drilling costs.

[0003] However, existing mechanical drilling rigs and grid-powered drilling rigs currently suffer from problems such as low control precision and safety, complex disassembly and assembly, and inconvenient transportation. While electric drilling rigs solve these problems, their controllers and motors use air-cooled structures, resulting in large equipment size and low heat dissipation efficiency. Furthermore, high-power generator sets are expensive, have low fuel efficiency, and suffer from low efficiency of the asynchronous motor on the drive side, as well as significant grid interference. Utility Model Content

[0004] The purpose of this invention is to provide a controllable rectified DC transmission hybrid power system for oil drilling rigs, which can solve the problems of high installation cost, high maintenance cost, large interference with power grid quality, large equipment size, and low system efficiency of existing drilling rig systems.

[0005] The technical solution adopted in this utility model is as follows: A controllable rectified DC power transmission hybrid power system for an oil drilling rig includes generator sets, a common DC bus, an energy storage battery pack, a water-cooled inverter drive unit, a main controller, a central controller, a braking unit, and a converter unit. The transmission ends of multiple generator sets are connected to the receiving ends of the common DC bus. The common DC bus is connected to the energy storage battery pack, and the transmission ends of the common DC bus are respectively connected to the receiving ends of multiple water-cooled inverter drive units. The water-cooled inverter drive units are connected to the load receiving ends of the oil drilling rig. The common DC bus also connects to the braking unit and the converter unit. The central controller is connected to the VCU controller of each generator set unit via a CAN communication bus. The central controller also communicates with the BMS system in the energy storage battery pack, the water-cooled inverter drive unit, and the main controller.

[0006] The generator unit includes multiple small-power generator sets and a VCU controller. Each small-power generator set is driven by a power unit to output AC power, which is then rectified by PWM and connected to the DC grid, and connected to a common DC bus.

[0007] The engine is a diesel engine or a gas engine, and the generator is a permanent magnet synchronous generator.

[0008] The energy storage battery pack includes a new energy power battery and a BMS system, with multiple branches of the new energy power battery connected in parallel.

[0009] The water-cooled inverter drive unit includes multiple water-cooled inverters, multiple water-cooled permanent magnet motors, and a load cell. Each inverter is connected to one of the permanent magnet motors it controls. The output shafts of the multiple water-cooled permanent magnet motors are connected to the corresponding input shafts of the load cell, and the output shaft of the load cell is connected to the load.

[0010] The braking unit includes a braking module and a braking resistor connected in sequence, with the braking module connected to a common DC bus.

[0011] The converter unit uses a PCS converter, which converts DC power into AC power at industrial frequency through a common DC bus to supply power to auxiliary equipment and other loads at the well site.

[0012] This invention employs a small-power generator unit as the power output to a common DC bus. A water-cooled inverter unit drives a permanent magnet synchronous motor to provide power to the drilling equipment. An energy storage battery pack is directly connected to the common DC bus to resist the impact load on the entire system. The PCS converter converts the power into industrial frequency AC power through the common DC bus to power auxiliary equipment and other equipment at the well site.

[0013] Furthermore, the permanent magnet motor and inverter are independently controlled, using a one-to-one approach to drive the water-cooled permanent magnet motor. Motor speed acquisition utilizes a built-in rotary transformer signal feedback, providing strong anti-interference capabilities. Simultaneously, the central controller controls the inverter using torque and position closed-loop mechanisms, ensuring power distribution among multiple water-cooled permanent magnet motors at the same speed. This also addresses some issues related to drilling equipment, such as electronic soft pumps and tool face positioning. Attached Figure Description

[0014] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0015] like Figure 1As shown, this utility model includes generator sets, a common DC bus, an energy storage battery pack, a water-cooled inverter drive unit, a main controller, a central controller, a braking unit, and a converter unit. The power transmission terminals of multiple generator sets are connected to the power receiving terminals of the common DC bus. The common DC bus is connected to the energy storage battery pack, and the power transmission terminals of the common DC bus are respectively connected to the power receiving terminals of multiple water-cooled inverter drive units. The water-cooled inverter drive units are connected to the load power receiving terminals of the oil drilling rig. The common DC bus also connects to the braking unit and the converter unit. The central controller is connected to the VCU controller of each generator set unit via a CAN communication bus. The central controller also communicates with the BMS system in the energy storage battery pack, the water-cooled inverter drive unit, and the main controller.

[0016] The generator unit includes multiple small-power generator sets and a VCU controller. Each small-power generator set is driven by a power unit to output AC power, which is then rectified by PWM and connected to the DC grid, and connected to a common DC bus.

[0017] The engine is a diesel engine or a gas engine, and the generator is a permanent magnet synchronous generator.

[0018] The energy storage battery pack includes a new energy power battery and a BMS system, with multiple branches of the new energy power battery connected in parallel.

[0019] The water-cooled inverter drive unit includes multiple water-cooled inverters, multiple water-cooled permanent magnet motors, and a load cell. Each inverter is connected to one of the permanent magnet motors it controls. The output shafts of the multiple water-cooled permanent magnet motors are connected to the corresponding input shafts of the load cell, and the output shaft of the load cell is connected to the load.

[0020] The braking unit includes a braking module and a braking resistor connected in sequence, with the braking module connected to a common DC bus.

[0021] The converter unit uses a PCS converter, which converts DC power into AC power at industrial frequency through a common DC bus to supply power to auxiliary equipment and other loads at the well site.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1As shown, this utility model comprises a generator set unit, a common DC bus, an energy storage battery pack, a water-cooled inverter drive unit, a main controller, a central controller, a braking unit, and a converter unit. The generator set unit outputs power to the common DC bus, and the water-cooled inverter drive unit drives a permanent magnet synchronous motor to provide power to the drilling equipment. The generator set unit of this utility model includes a fuel-powered generator or a gas-powered generator, which drives the permanent magnet synchronous motor to generate AC power. After PWM rectification, DC power is output to provide power to the entire system.

[0024] The energy storage battery pack is directly connected to the common DC bus. The energy storage battery pack includes new energy power batteries and a BMS system unit, is independently skid-mounted, has self-diagnostic capabilities, and plays a role in resisting the impact load on the entire system.

[0025] The central controller EMS connects to the generator set VCU controller, energy storage BMS controller, water-cooled inverter drive unit, and main controller via a CAN communication bus, enabling information communication between each unit.

[0026] The aforementioned water-cooled inverter drive unit group includes a drive device in which multiple water-cooled inverters and multiple water-cooled permanent magnet motors are connected in parallel via mechanical coupling. The motor output shaft is connected to the input shaft of the power box, and the output shaft of the power box is connected to a mud pump, winch, or turntable. This utility model's water-cooled inverter drive unit uses a new energy controller, with torque and position control. Each inverter corresponds to one water-cooled permanent magnet motor, and the water-cooled inverters and water-cooled permanent magnet motors are located via a skid or in a nearby location.

[0027] Each inverter's power receiving terminal is connected to a common DC bus, and each inverter's power output terminal is connected to the controlled terminal of the corresponding water-cooled permanent magnet motor. Each inverter corresponds to one water-cooled permanent magnet motor, and the water-cooled inverters and water-cooled permanent magnet motor units are located via a skid or in the vicinity.

[0028] The input side of the braking unit is connected to the common DC bus, and the output side of the braking unit is connected to the braking resistor. The PCS converter converts the AC power to power frequency AC power through the common DC bus to power auxiliary equipment and other equipment in the well site.

[0029] The main controller provides on-site operators with feedback information on equipment operation and status observation. Connected to the central controller via Profine communication, the central controller performs overall system analysis and control, rationally allocating power between the generator set and energy storage battery pack by detecting system load changes. This ensures the generator set operates at high power for extended periods, saving fuel while also stabilizing the system voltage. When the battery is disconnected from the grid, the braking unit transfers the feedback energy from motor deceleration to the braking resistor, stabilizing the DC voltage and preventing equipment shutdown due to excessively high common DC bus voltage. The converter unit converts DC power to mains frequency power for conventional equipment, and its built-in voltage regulation and filtering functions ensure system stability and safety.

[0030] This invention introduces an energy storage device into the generator set microgrid system, solving the problem of system instability under winch traction conditions. This allows the generator set to operate at high power levels for extended periods, improving fuel efficiency and reducing operating costs. PWM rectification ensures the grid ripple coefficient is no greater than 3‰, improving grid quality and extending equipment lifespan. The use of new energy permanent magnet synchronous motors, generators, and controllers replaces imported controllers and currently used DC or asynchronous motors, resulting in high module adoption rates, large shipment volumes, and significantly reduced installation costs. The system also boasts higher efficiency and a higher power factor.

[0031] The system features redundancy to prevent system downtime caused by the failure of a single controller or motor. The inverter, motor, and battery are water-cooled, significantly improving system cooling efficiency. Compared to the control room design of traditional electric systems, this reduces equipment size and simplifies installation and transportation.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A controllable rectified DC power transmission hybrid power system for oil drilling rigs, characterized in that: The system includes generator sets, a common DC bus, an energy storage battery pack, a water-cooled inverter drive unit, a main controller, a central controller, a braking unit, and a converter unit. The power transmission terminals of multiple generator sets are connected to the power receiving terminals of the common DC bus. The common DC bus is connected to the energy storage battery pack, and the power transmission terminals of the common DC bus are respectively connected to the power receiving terminals of multiple water-cooled inverter drive units. The water-cooled inverter drive units are connected to the load power receiving terminals of the oil drilling rig. The common DC bus also connects to the braking unit and the converter unit. The central controller is connected to the VCU controller of each generator set unit via a CAN communication bus. The central controller also communicates with the BMS system in the energy storage battery pack, the water-cooled inverter drive units, and the main controller. The water-cooled inverter drive unit includes multiple water-cooled inverters, multiple water-cooled permanent magnet motors, and a load cell. Each inverter is connected to one of the permanent magnet motors it controls. The output shafts of the multiple water-cooled permanent magnet motors are connected to the corresponding input shafts of the load cell, and the output shaft of the load cell is connected to the load.

2. The controllable rectified DC transmission oil drilling rig hybrid power system according to claim 1, characterized in that: The generator unit includes multiple small-power generator sets and a VCU controller. Each small-power generator set is driven by a power unit to output AC power, which is then rectified by PWM and connected to the DC grid, and connected to a common DC bus.

3. The controllable rectified DC transmission oil drilling rig hybrid power system according to claim 2, characterized in that: The generator is a permanent magnet synchronous generator.

4. The controllable rectified DC transmission oil drilling rig hybrid power system according to claim 1, characterized in that: The energy storage battery pack includes a new energy power battery and a BMS system, with multiple branches of the new energy power battery connected in parallel.

5. The controllable rectified DC transmission oil drilling rig hybrid power system according to claim 1, characterized in that: The braking unit includes a braking module and a braking resistor connected in sequence, with the braking module connected to a common DC bus.

6. The controllable rectified DC transmission oil drilling rig hybrid power system according to claim 1, characterized in that: The converter unit uses a PCS converter, which converts DC power into AC power at industrial frequency through a common DC bus to supply power to auxiliary equipment and other loads at the well site.

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