Multi-incremental power pressure equipment electric control system and power control method

Abstract

The application discloses a kind of multi-incremental power pressure equipment electric control system and power control method, electric control system includes at least one increaser and the power battery managed by battery management system, increaser and power battery are connected to DC distribution box, DC distribution box powers multiple motor inverters, multiple motor inverters correspond to control multiple motor operation;It also includes VCU controller and UDCU upper controller, UDCU upper controller is used to predict working condition and generate equipment operating parameter, VCU controller is respectively connected with UDCU upper controller, increaser, battery management system, DC distribution box, motor inverter communication, according to the operating data of UDCU upper controller generated to the optimization distribution of increaser and power battery, and through VCU controller control back-end equipment operation.The application solves the problems, such as single power supply mode, low efficiency of power system and imperfect control strategy in the prior art, and realizes efficient, stable and fast transition of pressure equipment operation in the environment without network power.

Description

Technical Field

[0001] This invention relates to the field of electrical control technology for cementing and fracturing operations in oil and gas fields. More specifically, this invention relates to an electrical control system and power control method for multi-range power cementing and fracturing equipment. Background Technology

[0002] In current diesel engine-driven cementing and fracturing equipment, the engine typically drives the cementing pump and fracturing pump after being reduced in speed by a gearbox. Due to the large load variations during cementing and fracturing operations, the engine's fuel efficiency is low, resulting in high fuel consumption and increased cementing and fracturing costs. In recent years, my country's cementing and fracturing equipment has been fully electrified, using electric motors to drive the cementing pump and fracturing pump. Figure 1 The diagram shows the current AC power supply system for cementing and fracturing equipment. This equipment requires 10kV or 35kV grid power for operation, necessitating the addition of a substation or VFD room in addition to the pump itself. Electric drive offers numerous advantages, such as high efficiency, energy saving, and environmental friendliness. However, the large motor power and high output current of electric cementing and fracturing equipment result in high labor intensity for workers during cable laying, reeling, connection, and disconnection, severely impacting the overall efficiency of cementing and fracturing operations. Furthermore, existing equipment primarily relies on grid power, limiting its operation in areas without grid power and restricting the geographical scope of fracturing operations. Moreover, relying on a single power source (such as a battery or a single range extender) prevents dynamic optimization of power allocation, leading to low energy efficiency and poor endurance. Additionally, the lack of intelligent algorithms for the coordinated control of multiple range extenders in fracturing equipment hinders real-time adaptive adjustment, affecting operational stability and efficiency. These are the problems that this invention aims to solve. Summary of the Invention

[0003] One objective of this invention is to provide an electrical control system and power control method for multi-range extended-range power solid pressure equipment, which solves the problems of single power supply mode, low power system efficiency and imperfect control strategy in the prior art, and realizes efficient, stable and rapid operation of solid pressure equipment in environments without grid power.

[0004] To address the aforementioned technical problems, this invention provides an electronic control system for a multi-range extended-range power fixed-pressure device, comprising at least one range extender and a power battery managed by a battery management system. Both the range extender and the power battery are connected to a DC power distribution box, which supplies power to multiple motor inverters, which in turn control the operation of multiple motors. The system also includes a VCU controller, which is communicatively connected to the range extender, battery management system, DC power distribution box, and motor inverters, and optimizes the power distribution between the range extender and the power battery.

[0005] Preferably, it also includes a UDCU upper-mount controller, which is used to predict operating conditions and generate equipment operating parameters. The VCU controller is also communicatively connected to the UDCU upper-mount controller. The VCU controller optimizes the allocation of the range extender and power battery according to the operating data generated by the UDCU upper-mount controller, and controls the operation of the back-end equipment through the VCU controller.

[0006] Preferably, multiple motors correspond one-to-one with multiple range extenders, multiple battery management systems, and multiple DC power distribution boxes. A range extender and a power battery managed by a battery management system are connected to the same DC power distribution box, and a DC power distribution box is connected to a motor inverter.

[0007] Preferably, the multiple motor inverters corresponding to multiple motors are powered through a single DC power distribution box.

[0008] Preferably, the power battery is an integrated power battery pack, which is connected to a DC power distribution box together with at least one range extender.

[0009] The present invention also provides a power control method for an electrical control system of a multi-range extended-range power fixed pressure equipment, comprising the following steps: Step 1: The upper-mount controller UDCU sends the calculated power demand value based on the actual operating conditions to the VCU controller. The VCU compares this value with the actual power feedback value to generate a power error E. Step 2: After the power error E is differentiated and fuzzified, the output includes fuzzy input quantities e and ec, which include error fuzzification and error rate of change fuzzification. Step 3: The fuzzy controller adjusts the PID parameters according to the preset operating condition rules and the fuzzy input quantities of e and ec to achieve self-tuning PID control; Step 4: The VCU outputs dynamic power demand through self-tuned PID parameters, and performs weight calculations based on the battery state of charge (SOC) information provided by the BMS battery management system to dynamically allocate power between multiple range extenders and the power battery. Step 5: After power allocation is completed, instructions are sent to multiple range extender controllers (RCUs) to achieve coordinated power generation control of multiple range extenders. Step 6: Subtract the actual power feedback of each motor inverter MCU from the output power of the BMS to obtain the new actual power feedback value, which is then fed back to Step 1 to form a closed-loop feedback, ensuring real-time adaptive adjustment of the system.

[0010] The present invention also provides a power control method for an electrical control system of a multi-range extended-range power fixed pressure equipment, comprising the following steps: Step S1: The VCU controller sends a start signal to the RCU controller of one or more range extenders based on the load demand fed back by the motor inverter MCU, and then sends a pre-charge command to the DC power distribution box to connect the started range extender and the power battery to the DC bus. Step S2: If the load demand fed back by the motor inverter MCU is less than the set value of the rated power of a single range extender, shut down all range extenders and use only the power battery for power supply; if the power battery charge is lower than the set value, start at least one range extender to replenish power. Step S3: If the load demand fed back by the motor inverter MCU is within the set difference range of the rated power of one or more range extenders, then the VCU controller controls one or more range extenders to operate at their rated power, and the power battery is used to smooth out the peak and fill the valley of the power difference.

[0011] Preferably, the specific control method in step S3 is as follows: Step 1: The upper-mount controller UDCU sends the calculated power demand value based on the actual operating conditions to the VCU controller. The VCU compares this value with the actual power feedback value to generate a power error E. Step 2: After the power error E is differentiated and fuzzified, the output includes fuzzy input quantities e and ec, which include error fuzzification and error rate of change fuzzification. Step 3: The fuzzy controller adjusts the PID parameters according to the preset operating condition rules and the fuzzy input quantities of e and ec to achieve self-tuning PID control; Step 4: The VCU outputs dynamic power demand through self-tuned PID parameters, and performs weight calculations based on the battery state of charge (SOC) information provided by the BMS battery management system to dynamically allocate power between multiple range extenders and the power battery. Step 5: After power allocation is completed, instructions are sent to multiple range extender controllers (RCUs) to achieve coordinated power generation control of multiple range extenders. Step 6: Subtract the actual power feedback of each motor inverter MCU from the output power of the BMS to obtain the new actual power feedback value, which is then fed back to Step 1 to form a closed-loop feedback, ensuring real-time adaptive adjustment of the system.

[0012] The present invention has at least the following beneficial effects: 1. The motor power supply of the cementing and fracturing equipment of the present invention does not rely on the power grid, and can operate stably in environments without grid power, thus expanding the operating area; in addition, the use of multiple range extenders for coordinated control improves energy utilization efficiency and extends the equipment's endurance.

[0013] 2. The motor power of the cementing and fracturing equipment of this invention comes from its own range extender and power battery. All cable connections between system components are mounted on the vehicle, eliminating the need for external power supply. This avoids the need for workers to lay, reel in, connect, and disconnect cables before operation, greatly reducing the labor intensity of workers, improving work efficiency, and enhancing equipment safety and personnel safety.

[0014] 3. The cementing and fracturing pump of the present invention adopts multi-motor drive, one of which is multi-motor distributed drive, where each motor is powered by a range extender and a power battery, which can realize single-machine operation or multi-machine synchronous operation.

[0015] 4. The cementing and fracturing pump of the present invention adopts multi-motor drive. Alternatively, the power supply for each motor can be a combination of one or more range extenders and an independent power battery pack. The number of motors and range extenders to be put into operation can be selected according to the load, thereby improving equipment redundancy and operating efficiency. The combined power supply of multiple range extenders and independent power battery packs is connected through PDU. When one or more range extenders fail, the battery can provide power supplementation without reducing the operating power of the equipment, further improving the stability of cementing and fracturing operations.

[0016] 5. This invention reads the torque current and power of each motor inverter through the VCU controller, optimizes parameter allocation, and enables multiple range extenders and multiple motors to output synchronously and evenly, ensuring stable operation of cementing and fracturing operations; it can also achieve precise optimization of dynamic power allocation, automatically adjusting the output ratio of each power source according to actual working conditions; and through self-tuning PID control, it improves system response speed and stability, reduces power fluctuations; it also supports rapid site transfer, improves operational efficiency, and reduces operational costs.

[0017] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0018] Figure 1 For the existing AC power supply system used in fixed pressure equipment; Figure 2 This is a diagram illustrating the electrical control system architecture of a distributed multi-range extended-range power solid pressure device according to the present invention. Figure 3 This is a diagram illustrating the electrical control system architecture of an integrated multi-range extended-range power solid pressure device according to the present invention. Figure 4 This invention relates to a power control method for an electrical control system of a multi-range extended-range power fixed pressure equipment. Detailed Implementation

[0019] To better understand the purpose, structure, and function of this invention, the invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] This invention provides an electronic control system for a multi-range extended-range power fixed-pressure equipment, including at least one range extender and a power battery managed by a battery management system. Both the range extender and the power battery are connected to a DC power distribution box, which supplies power to multiple motor inverters, each controlling the operation of multiple motors. The system also includes a VCU controller, which is communicatively connected to the range extender, battery management system, DC power distribution box, and motor inverters, optimizing the power allocation between the range extender and the power battery. Furthermore, it includes a UDCU upper-mount controller, which predicts operating conditions and generates equipment operating parameters. The VCU controller is also communicatively connected to the UDCU upper-mount controller. The VCU controller optimizes the power allocation between the range extender and the power battery based on the operating data generated by the UDCU upper-mount controller and controls the operation of the back-end equipment through the VCU controller.

[0022] Example 1 like Figure 2As shown, a distributed multi-range extended-range power fixed-pressure equipment electrical control system architecture includes a VCU controller 1, range extenders 2-1~2-N, a BMS battery management system 3-1~3-N, power batteries 4-1~4-N, DC distribution boxes 5-1~5-N, motor inverters 6-1~6-N, and motors 7-1~7-N. After circuit connections, the distributed multi-range extended-range power fixed-pressure equipment electrical control system is realized. Multiple motors correspond one-to-one with multiple range extenders, multiple battery management systems, and multiple DC distribution boxes. A range extender and a power battery managed by a battery management system share the same DC distribution box, and a DC distribution box is connected to one motor inverter. The VCU controller communicates with the RCU controllers of N range extenders, N BMS battery management systems, N DC power distribution boxes, and N motor inverters. It reads the main parameters such as the charge of N power batteries and the voltage, current, and power of N motor inverters, and controls the operation of N range extenders and N motors. The AC power generated by the range extender is converted into DC power by the internal GCU and then sent to the DC power distribution box. Under the control of the VCU controller, the power battery directly sends DC power to the DC power distribution box, which can work with the range extender to provide DC power to the downstream motor inverter, enabling the motor inverter to control the speed and torque of the motor.

[0023] The cementing fracturing pump employs a multi-motor distributed drive system. Each motor is powered by a combination of a range extender and a power battery, enabling single-unit operation or synchronous operation of multiple units. Since the motors in the cementing fracturing equipment are powered by their own range extenders and power batteries, no external power supply is required. This eliminates the need for manual wiring, significantly reducing worker workload and demonstrating broad application prospects. The VCU controller reads the torque, current, and power of each motor inverter, optimizing parameter allocation to ensure synchronized and balanced output from multiple range extenders and motors, guaranteeing stable operation of cementing fracturing operations. It also enables precise dynamic power allocation optimization, automatically adjusting the output ratio of each power source based on actual operating conditions.

[0024] Example 2 like Figure 3As shown, an integrated multi-range extended-range power fixed-pressure equipment electronic control system architecture includes multiple range extenders (range-extended generators) and a power storage battery managed by a battery management system at the power supply end; a DC distribution power supply (DC power distribution box PDU) at the bus end; and multiple motor inverters and multiple motors at the load end. The power supply of this electronic control system uses multiple range extenders and an integrated power battery connected together via the high-voltage power distribution power supply PDU, providing DC power to the load motor controllers via the DC bus, and is coordinated and managed by the vehicle controller (VCU). Multiple motor inverters corresponding to multiple motors are powered through a single DC power distribution box; the power battery is an integrated power battery pack, which, along with at least one range extender, is connected to a single DC power distribution box. The number and capacity of the range extenders and power batteries can be configured according to the actual load conditions. The power battery mainly serves to smooth peak loads and ensure the high-efficiency operation of the range extenders. Compared to the current electric control systems of electric fixed pressure equipment, the electrical control system of this embodiment increases the redundancy of the equipment itself (the failure of a single range extender or motor does not affect the use of the equipment), saves the VFD room, and reduces the amount of on-site wiring work.

[0025] The system hardware architecture is divided into a power supply section, a power distribution unit, a load side, and a control unit, and its construction method is as follows: 1. Power Supply Section: One or more range-extended generator sets output DC power via cables to the DC bus of the Power Distribution Unit (PDU). An integrated battery pack outputs DC power via cables to the PDU DC bus, forming a common bus with the DC power outputs of the multiple generator sets. The principle is as follows: Upon battery power-up, the vehicle control unit (VCU) establishes voltage. Based on load power data fed back from the motor controller (MCU), it sends a power demand to the battery pack's built-in battery management system (BMS), causing the battery to discharge. The power of the load pressure pump changes in real-time according to operational needs. Specifically, the MCU sends the real-time load power demand to the VCU, which receives the power command and coordinates the power distribution to the range extender controller (RCU) and the battery management system (BMS). When the load power demand decreases, the generator's surplus energy charges the battery, achieving power matching with the engine.

[0026] 2. Power Distribution Unit: The Power Distribution Unit (PDU) adopts an integrated design. It receives electrical energy from one or more range extender generator sets and power battery packs via cables and distributes it to the load end, playing the role of circuit distribution and protection. At the same time, it communicates with the vehicle controller (VCU) to realize remote control and status monitoring of the high-voltage system.

[0027] 3. Load Side: Multiple cementing pumps drive permanent magnet synchronous motors. The power distribution unit (PDU) outputs DC power, which is connected to the motor controller (MCU) via cables, and then outputs three-phase AC power, which is connected to the three-phase stator windings of the motors via cables. The motor controller (MCU) collects and calculates the motor's three-phase current, DC bus voltage, motor position signal, and the current vehicle requirements, and outputs three-phase voltage to control the motor torque and speed.

[0028] 4. Control Unit: The vehicle controller (VCU) communicates with the RCUs of multiple range extender generators, the BMS of the battery, the PDU of the power distribution unit, and the MCU of the motor controller via the CAN bus. It transmits commands and receives feedback signals to perform energy allocation, data monitoring, and coordinated control of the whole vehicle.

[0029] ①The VCU sends a start signal to one or more range extender RCUs based on the load demand fed back by the MCU, and then sends a pre-charge command to the PDU to connect the started range extender and the power battery to the DC bus.

[0030] ② The load on the fixed pressure pump is relatively low. If the rated power of a single range extender is large, much greater than the current load power, the fuel efficiency of the range extender will be very low and the economy will be low if it is used to generate electricity. Therefore, only the power battery is used as the load power source. If the power battery is low, one or more range extenders are started to quickly replenish the battery.

[0031] ③ The load on the cementing pump fluctuates around the rated power of one or more range extenders. Each range extender operates at its rated and most economical state, and the fluctuating power is peaked and valley-filled by the power battery.

[0032] ④ During operation, the VCU reads the power requirements of the MCU in real time, enabling each range extender and the power battery to perform power matching, while keeping the range extender in a high-efficiency operating range to ensure economy.

[0033] Example 3 like Figure 4As shown, a power control method for the electrical control system of a multi-range extended-range power fixed-pressure equipment is described. The UDCU (Upper Structure Controller) sends a power setpoint to the VCU (Equipment Controller) via CAN communication. The VCU compares this setpoint with the actual power feedback (P-Feedback) to generate a power error E. After differentiation (dP / dt) and fuzzification, this error is output as fuzzy input quantities e (error fuzzification) and ec (error change rate fuzzification). The fuzzy controller outputs PID parameter adjustment quantities (ΔKp, ΔKi, ΔKd) according to preset operating condition rules to achieve self-tuning PID control. The self-tuned PID outputs dynamic power demand, and weights are calculated based on the SOC information provided by the BMS (Power System) to dynamically allocate the power weights of the three range extenders and the battery. After power allocation is completed, instructions are sent to the three RCUs (Range Extender Controllers) to achieve multi-range extender power generation coordinated control. The actual power feedback of each MCU is subtracted from the BMS output power to obtain a new P-Feedback, forming a closed-loop feedback to ensure real-time adaptive adjustment of the system.

[0034] The specific implementation steps are as follows: 1. The UDCU calculates the power demand value based on the actual working conditions and sends it to the VCU controller via the CAN bus.

[0035] 2. The VCU compares the power setpoint with the actual power feedback (P-Feedback) to obtain the power error E. The actual power includes the power demand fed back by the MCU minus the actual power generated by the BMS. This final actual power demand varies with load changes. The actual power is calculated using the input and output current measured by the MCU and BMS built-in sensors, and the VCU reads this data via communication. The power error is controlled within 10kW, and fuzzy control is used to ensure that the actual power fluctuation is controlled, avoiding excessively sensitive fluctuations in the power setpoint.

[0036] 3. Differentiate the power error E to obtain the error change rate dP / dt.

[0037] 4. The error E and the rate of change of error dP / dt are fuzzed to obtain e and ec, respectively.

[0038] 5. The fuzzy controller outputs PID parameter adjustment quantities (ΔKp, ΔKi, ΔKd) based on preset operating condition rules (such as high load, low load, transitional operating conditions, etc.) and fuzzy input quantities of e and ec, thereby realizing self-tuning PID control.

[0039] In preset operating conditions, such as during the transition from high load to low load, the VCU prioritizes replenishing the battery with the range extender's energy rather than directly reducing the speed. By adjusting ΔKp, ΔKi, and ΔKd, it ensures a smooth power decrease in the range extender, always remaining within the high-efficiency range of the current power output. During the transition from low load to high load, the VCU prioritizes using the battery's energy, adjusting ΔKp, ΔKi, and ΔKd based on the battery's SOC to ensure a smooth power increase in the range extender, always remaining within the high-efficiency range of the current power output. Under long-term operation (high load / low load), the VCU adjusts ΔKp, ΔKi, and ΔKd to ensure the range extender does not experience excessive power sensitivity fluctuations and always operates within the high-efficiency range of the current power output.

[0040] 6. Calculate the final power requirement based on the adjusted PID parameters.

[0041] 7. Based on the SOC (State of Charge) information provided by the BMS (Battery Management System), perform weight calculation (to maintain the consistent lifespan of multiple range extenders, calculate a cumulative weight based on the operating time and operating power of the range extenders to ensure consistent overall maintenance time of the power generation equipment), and dynamically allocate the power weights of the three range extenders and the battery.

[0042] 8. After power allocation is completed, the instructions are sent to the three RCUs (range extender controllers) respectively. The battery weight refers to the allocation of SOC (remaining battery charge). During operation, the power generation of the three range extenders is adjusted according to the actual power demand to ensure that the battery does not overcharge or over-discharge.

[0043] 9. The actual power feedback of each MCU (motor controller) is subtracted from the output power of the BMS and used as the new P-Feedback to form a closed-loop feedback.

[0044] 10. Through continuous closed-loop feedback, the system can adaptively adjust in real time to ensure optimal power distribution and system stability under various operating conditions.

[0045] As fracturing operations continue to expand into remote mountainous and desert areas, the power supply problem for electrically driven fracturing has become a key factor restricting operational efficiency. The multi-range extended power control method provided by this invention can effectively solve the energy supply problem in environments without grid power, supporting the stable operation of fracturing equipment in areas without grid coverage, and providing technical support for the development of oil and gas resources in my country. With the development of domestic oilfields extending to more remote areas, the application prospects of this technology are broad, and it is expected to become one of the standard configurations of electrically driven fracturing equipment within the next 5-10 years.

[0046] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention, and other modifications can be easily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. An electrical control system for a multi-range extended-range power fixed pressure equipment, characterized in that, It includes at least one range extender and a power battery managed by a battery management system. Both the range extender and the power battery are connected to a DC power distribution box, which supplies power to multiple motor inverters. The multiple motor inverters control the operation of multiple motors. It also includes a VCU controller, which is communicatively connected to the range extender, the battery management system, the DC power distribution box, and the motor inverters to optimize the power distribution of the range extender and the power battery.

2. The electrical control system for multi-range extended-range power fixed pressure equipment as described in claim 1, characterized in that, It also includes a UDCU upper-mount controller, which is used to predict operating conditions and generate equipment operating parameters. The VCU controller is also connected to the UDCU upper-mount controller. The VCU controller optimizes the allocation of the range extender and power battery according to the operating data generated by the UDCU upper-mount controller, and controls the operation of the back-end equipment through the VCU controller.

3. The electrical control system for multi-range extended-range power fixed pressure equipment as described in claim 2, characterized in that, Multiple motors correspond one-to-one with multiple range extenders, multiple battery management systems, and multiple DC power distribution boxes. A range extender and a power battery managed by a battery management system are connected to the same DC power distribution box, and a DC power distribution box is connected to a motor inverter.

4. The electrical control system for multi-range extended-range power fixed pressure equipment as described in claim 2, characterized in that, Multiple motor inverters corresponding to multiple motors are powered through a single DC power distribution box.

5. The electrical control system for multi-range extended-range power fixed pressure equipment as described in claim 4, characterized in that, The power battery is an integrated power battery pack, which is connected to a DC power distribution box together with at least one range extender.

6. A power control method for the electrical control system of a multi-range extended-range power fixed pressure equipment as described in claim 3, characterized in that, Includes the following steps: Step 1: The upper-mount controller UDCU sends the calculated power demand value based on the actual operating conditions to the VCU controller. The VCU compares this value with the actual power feedback value to generate a power error E. Step 2: After the power error E is differentiated and fuzzified, the output includes fuzzy input quantities e and ec, which include error fuzzification and error rate of change fuzzification. Step 3: The fuzzy controller adjusts the PID parameters according to the preset operating condition rules and the fuzzy input quantities of e and ec to achieve self-tuning PID control; Step 4: The VCU outputs dynamic power demand through self-tuned PID parameters, and performs weight calculations based on the battery state of charge (SOC) information provided by the BMS battery management system to dynamically allocate power between multiple range extenders and the power battery. Step 5: After power allocation is completed, instructions are sent to multiple range extender controllers (RCUs) to achieve coordinated power generation control of multiple range extenders. Step 6: Subtract the actual power feedback of each motor inverter MCU from the output power of the BMS to obtain the new actual power feedback value, which is then fed back to Step 1 to form a closed-loop feedback, ensuring real-time adaptive adjustment of the system.

7. A power control method for the electrical control system of a multi-range extended-range power fixed pressure equipment as described in claim 4 or 5, characterized in that, Includes the following steps: Step S1: The VCU controller sends a start signal to the RCU controller of one or more range extenders based on the load demand fed back by the motor inverter MCU, and then sends a pre-charge command to the DC power distribution box to connect the started range extender and the power battery to the DC bus. Step S2: If the load demand fed back by the motor inverter MCU is less than the set value of the rated power of a single range extender, shut down all range extenders and use only the power battery for power supply; if the power battery charge is lower than the set value, start at least one range extender to replenish power. Step S3: If the load demand fed back by the motor inverter MCU is within the set difference range of the rated power of one or more range extenders, then the VCU controller controls one or more range extenders to operate at their rated power, and the power battery is used to smooth out the peak and fill the valley of the power difference.

8. The power control method of the multi-range extended-range power fixed pressure equipment electrical control system as described in claim 7, characterized in that, In step S3, the specific control method is as follows: Step 1: The upper-mount controller UDCU sends the calculated power demand value based on the actual operating conditions to the VCU controller. The VCU compares this value with the actual power feedback value to generate a power error E. Step 2: After the power error E is differentiated and fuzzified, the output includes fuzzy input quantities e and ec, which include error fuzzification and error rate of change fuzzification. Step 3: The fuzzy controller adjusts the PID parameters according to the preset operating condition rules and the fuzzy input quantities of e and ec to achieve self-tuning PID control; Step 4: The VCU outputs dynamic power demand through self-tuned PID parameters, and performs weight calculations based on the battery state of charge (SOC) information provided by the BMS battery management system to dynamically allocate power between multiple range extenders and the power battery. Step 5: After power allocation is completed, instructions are sent to multiple range extender controllers (RCUs) to achieve coordinated power generation control of multiple range extenders. Step 6: Subtract the actual power feedback of each motor inverter MCU from the output power of the BMS to obtain the new actual power feedback value, which is then fed back to Step 1 to form a closed-loop feedback, ensuring real-time adaptive adjustment of the system.

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