Oil well wind-light-diesel intelligent power generation and oil pumping control system

Abstract

The invention relates to an oil well wind-solar-diesel intelligent power generation and oil pumping control system which is characterized by comprising a photovoltaic MPPT charging module, a fan charging module, a rectifier module, a frequency converter, a diesel generator, a BMS battery management module, an EMS energy management module, a touch screen display module and an RTU communication module. The EMS energy management module is used for coordinating and controlling the generated power of the photovoltaic module, the fan module, the diesel generator and the rectifier module, preferentially using the photovoltaic module and the fan to generate power, and adjusting the running state of each module according to the battery voltage, the SOC and the load power of the BMS; the diesel generator can be used in areas without electricity to perfectly replace a diesel generator. Compared with a diesel generator for oil pumping or power generation, the system has the greatest advantages of low maintenance cost and high economic benefit.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent power generation pumping control systems, and specifically relates to an intelligent wind-solar-diesel power generation pumping control system for oil wells. Background Art

[0002] Photovoltaics and wind turbines have developed rapidly and there is overcapacity. To store the excessive energy generated by photovoltaics and wind turbines and continuously supply power to the system, an energy storage system is required. Therefore, current industrial and commercial energy storage and photovoltaic energy storage power generation are very popular. Compared with traditional energy storage systems, which only store energy and then sell it to power companies, the income per kilowatt-hour is much less than that when power companies sell electricity to electricity-consuming enterprises. Therefore, the most profitable way for electricity-consuming enterprises to install new energy storage power generation is self-generation and self-use.

[0003] At the same time, this system can also be used in areas without electricity, perfectly replacing diesel generators. Compared with using a diesel generator for pumping or power generation, the greatest advantage of this system is its low maintenance cost and high economic efficiency. At the same time, diesel power generation can also be used as a backup energy source for the system, making the system safer and more reliable. According to data statistics, when using a diesel generator for pumping, diesel needs to be added every day to ensure the reliable operation of the system. With this system, diesel can be added once every three months or half a year, which greatly reduces the use of diesel. At the same time, since there is no need to refuel and maintain the diesel generator every day, the labor maintenance cost is also greatly saved. If one person needs to drive to refuel and maintain a well every day, now it is once every three months. So a lot of labor costs can also be saved in the middle. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title, but such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the following technical problems in the prior art: it is difficult for the prior art to adapt new energy power generation to replace diesel power generation for application in pumping.

[0006] To solve the above technical problems, the present invention provides the following technical solution: an intelligent wind-solar-diesel power generation pumping control system for oil wells, characterized by comprising:

[0007] a photovoltaic MPPT charging module, a wind turbine charging module, a rectification module, an inverter, a diesel generator, a BMS battery management module, an EMS energy management module, a touch screen display module, an RTU communication module;

[0008] The EMS energy management module is used to coordinate and control the power generation of the photovoltaic module, the wind turbine module, the diesel generator, and the rectifier module, preferentially using photovoltaic and wind power generation, and adjusting the operating states of each module according to the battery voltage, SOC, and load power of the BMS;

[0009] The system controls the operating speed of the pumping unit through a frequency converter, dynamically adjusts the output frequency of the frequency converter according to the battery power, and realizes energy conservation and consumption reduction;

[0010] The system also includes an intelligent fault diagnosis module before startup, which is used to detect the states of the charging circuit, the main circuit contactor, the communication module, the power supply module, and the frequency converter control system;

[0011] The diesel generator automatically starts when the battery power is insufficient and shuts down when the power generation of wind and light meets the load demand;

[0012] The rectifier module is used to balance the load power and the power generation, and perform valley charging or emergency charging on the battery through the mains or the diesel generator.

[0013] As a preferred technical solution of an intelligent oil well wind-solar-diesel power generation pumping control system, the intelligent fault diagnosis module includes the following steps:

[0014] Step A-1: Start load charging through a current-limiting resistor, and delay to detect the load voltage to judge whether the charging circuit is normal;

[0015] Step A-2: If the charging is normal, close the main circuit contactor and turn off the charging circuit, and delay to read the voltage to judge the system power supply state;

[0016] Step A-3: Read the states of each power supply module through the communication module and execute the module self-check program;

[0017] Step A-4: When the power supply of the photovoltaic and wind turbines is normal, send a charging command and detect the operating state of the charging module;

[0018] Step A-5: After the power supply is normal, send a running command to the frequency converter and detect the state of the frequency converter control system;

[0019] Step A-6: Start the diesel generator and control the operation of the rectifier module during power-on startup, and detect the rectifier charging control state.

[0020] As a preferred technical solution of an intelligent oil well wind-solar-diesel power generation pumping control system, the EMS energy management module calculates the average load power consumption and the hourly power consumption through integration, and predicts the operating time of the controllable load in combination with the battery SOC value; when the battery power is lower than the threshold, start the diesel generator and adjust the output power of the rectifier module through the load power integration value.

[0021] As an optimal technical solution of an intelligent control system for pumping oil with wind, light and diesel power generation in oil wells, the intelligent control system of the frequency converter includes:

[0022] Step C-1: Switch between continuous control or intermittent control mode according to the battery power and the output power of the charging module;

[0023] Step C-2: Calculate the average operating power of the frequency converter through integration and limit the output power of the rectification module;

[0024] Step C-3: When the battery is fully charged or the charging power is greater than the load power, the frequency converter operates at the set frequency; when the power is insufficient, it automatically reduces the frequency to operate.

[0025] As an optimal technical solution of an intelligent control system for pumping oil with wind, light and diesel power generation in oil wells, the start-stop logic of the diesel engine is as follows:

[0026] Automatically start the diesel generator when it is detected that the battery voltage or power is lower than the threshold;

[0027] When the wind and light power generation is greater than the sum of the frequency conversion load power and the rectification module power, turn off the rectification module and stop the diesel generator.

[0028] As an optimal technical solution of an intelligent control system for pumping oil with wind, light and diesel power generation in oil wells, the power balance control of the rectification module includes:

[0029] Step D-1: Detect the load power and the cumulative average power to ensure that the rectification module power is greater than both to prevent the continuous decrease of the battery power;

[0030] Step D-2: When the rectification power supply is a diesel generator and the battery SOC>40% and the voltage is higher than the stop threshold, stop the rectification module from working;

[0031] Step D-3: When the rectification power supply is the commercial power and it is in the valley charging period, start charging and limit the battery SOC≤60% to reserve the wind and light charging capacity.

[0032] As an optimal technical solution of an intelligent control system for pumping oil with wind, light and diesel power generation in oil wells, the wind-solar complementary power generation control includes:

[0033] Step E-1: The photovoltaic module adopts MPPT control to track the maximum power generation, and the power generation of the wind turbine and photovoltaic is limited by the battery power and the charge and discharge current;

[0034] Step E-2: The wind and light power generation preferentially supplies the load, and the excess power is stored in the battery.

[0035] As an optimal technical solution of an intelligent power generation and pumping control system for oil wells with wind, light, and diesel, it further includes a function for setting the energy storage time. The rectifier module is started to charge to a specified SOC value and then stopped during a preset period, and the rectifier module is turned off during peak electricity price periods, and the battery is preferentially used for power supply.

[0036] As an optimal technical solution of an intelligent power generation and pumping control system for oil wells with wind, light, and diesel, the system has a function of bypassing the industrial frequency converter. When the energy storage system fails or the battery power is too low, it switches to the mains power or a diesel generator to directly drive the pumping unit.

[0037] As an optimal technical solution of an intelligent power generation and pumping control system for oil wells with wind, light, and diesel, the self-diagnosis function of the system detects the module status in real time, and the fault types include system undervoltage, overcurrent, output phase loss, abnormal charging module, frequency converter failure, and lack of oil warning for the diesel generator.

[0038] Advantages of the present invention: The present invention can be used in areas without electricity and perfectly replaces diesel generators. Compared with using a diesel generator for pumping or power generation, the greatest advantage of this system is its low maintenance cost and high economic benefits. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0040] Figure 1 It is a schematic diagram of the system principle of the technical solution of the present invention. Detailed Embodiments

[0041] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made with reference to the drawings in the specification.

[0042] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0043] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0044] Next, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0045] Embodiment 1

[0046] Refer to Figure 1 , this embodiment provides an intelligent power generation and pumping control system for oil wells integrating wind, light, and diesel, including: a photovoltaic MPPT charging module, a wind turbine charging module, a rectification module, an inverter, a diesel generator, a BMS battery management module, an EMS energy management module, a touch screen display module, and an RTU communication module;

[0047] The EMS energy management module is used to coordinately control the power generation of the photovoltaic module, the wind turbine module, the diesel generator, and the rectification module, preferentially using wind and light power generation, and adjusting the operating states of each module according to the battery voltage, SOC, and load power of the BMS;

[0048] The system controls the operation speed of the pumping unit through the inverter, dynamically adjusts the output frequency of the inverter according to the battery power, and realizes energy saving and consumption reduction;

[0049] The system also includes an intelligent fault diagnosis module before startup, which is used to detect the states of the charging circuit, the main circuit contactor, the communication module, the power supply module, and the inverter control system;

[0050] The diesel generator automatically starts when the battery power is insufficient and shuts down when the wind and light power generation meet the load demand;

[0051] The rectification module is used to balance the load power and the power generation, and perform valley charging or emergency charging of the battery through the mains or the diesel generator.

[0052] The intelligent fault diagnosis module includes the following steps:

[0053] Step A-1: Start the load charging through a current-limiting resistor, and delay to detect the load voltage to judge whether the charging circuit is normal;

[0054] Step A-2: If the charging is normal, close the main circuit contactor and turn off the charging circuit, and delay to read the voltage to judge the system power supply state;

[0055] Step A-3: Read the states of each power supply module through the communication module and execute the module self-check program;

[0056] Step A-4: When the power supply of the photovoltaic and the wind turbine is normal, send a charging command and detect the operating state of the charging module;

[0057] Step A-5: After normal power supply, send a running command to the frequency converter and detect the status of the frequency converter control system;

[0058] Step A-6: Start the diesel generator and control the operation of the rectifier module during power-on startup, and detect the rectifier charging control status.

[0059] The EMS energy management module calculates the average power consumption of the load and the power consumption per hour through integration, and predicts the running time of the controllable load in combination with the battery SOC value; when the battery power is lower than the threshold, start the diesel generator and adjust the output power of the rectifier module through the load power integration value.

[0060] The intelligent control system of the frequency converter includes:

[0061] Step C-1: Switch between continuous control or intermittent control mode according to the battery power and the output power of the charging module;

[0062] Step C-2: Calculate the average running power of the frequency converter through integration and limit the output power of the rectifier module;

[0063] Step C-3: When the battery power is sufficient or the charging power is greater than the load power, the frequency converter operates at the set frequency; when the power is insufficient, it automatically reduces the frequency to operate.

[0064] The start-stop logic of the diesel engine is:

[0065] Automatically start the diesel generator when it is detected that the battery voltage or power is lower than the threshold;

[0066] When the wind-solar power generation is greater than the sum of the frequency conversion load power and the rectifier module power, turn off the rectifier module and stop the diesel generator.

[0067] The power balance control of the rectifier module includes:

[0068] Step D-1: Detect the load power and the cumulative average power to ensure that the rectifier module power is greater than both to prevent the continuous decline of the battery power;

[0069] Step D-2: When the rectifier power supply is the diesel generator and the battery SOC>40% and the voltage is higher than the stop threshold, stop the rectifier module from working;

[0070] Step D-3: When the rectifier power supply is the commercial power and it is in the valley charging period, turn on the charging and limit the battery SOC≤60% to reserve the wind-solar charging capacity.

[0071] The wind-solar complementary power generation control includes:

[0072] Step E-1: The photovoltaic module adopts MPPT control to track the maximum power generation, and the power generation of the fan and photovoltaic is limited by the battery power and charge and discharge current;

[0073] Step E-2: Wind and solar power generation preferentially supplies the load, and the excess power is stored in the battery.

[0074] It also includes a energy storage time setting function. The rectifier module is started to charge to the specified SOC value and then stopped through a preset time period, and the rectifier module is turned off during the peak electricity price period, and the battery is preferentially used for power supply.

[0075] The system has a frequency converter bypass function. When the energy storage system fails or the battery power is too low, it switches to the mains or diesel generator to directly drive the pumping unit.

[0076] The system self-diagnosis function detects the module status in real time. The fault types include system undervoltage, overcurrent, output phase loss, charging module abnormality, frequency converter failure, and diesel generator fuel shortage alarm

[0077] Specifically, the control of the present invention is implemented based on the new energy EMS control and management module. It analyzes the charging power of each charging module, counts the charging data, and receives the operation information of the variable frequency load device, formulates the management strategy of the module power generation power and the speed management strategy of the variable frequency load; receives the information of the upper computer through the CAN, TCP / IP, RS485 communication interfaces, controls the start and stop status of each charging module, limits the maximum charging power of the charging module, and can also adjust the output frequency of the frequency converter.

[0078] Furthermore, the load power and power generation power are calculated by integration. Coordinate the output power of the rectifier module to minimize the use of the energy of the diesel generator / mains and maximize the use of the energy of photovoltaic and wind power generation.

[0079] Furthermore, the system includes a photovoltaic MPPT charging module, a fan charging module, a rectifier module, a BMS battery management module, an oil machine and mains switching unit, a frequency converter, a diesel generator, an EMS management module, a touch screen, and an RTU communication management module.

[0080] The wind-solar-diesel energy storage EMS management module communicates and interacts with the BMS data of the system. Reads the status of the battery, the temperature of each battery cell, the voltage of each battery cell, SOC, SOP, charge and discharge voltage, alarm values, etc., and reasonably limits the charging current of the charging module and the power consumption of the load.

[0081] Periodic management settings for system data. Since the oilfield pumping equipment has an upstroke and a downstroke, it generates electricity during one stroke and discharges electricity during the other stroke. Therefore, the power of the charging module and the load cannot be determined based on the charging module and the instantaneous power of the load. Through periodic integral acquisition and calculation, it is determined whether the battery is in a discharging state or a generating state. Then, based on the energy of charge and discharge within a period, the output power of the charging module is determined.

[0082] Energy storage time setting function, that is, it is possible to set an appropriate time to start charging the battery through the rectifier module. When the battery is charged to a reasonable voltage or SOC value, the charging stops, and then the load periodic power is equal to the rectifier output power. When the preset discharge time is reached, the rectifier module is turned off, and the electricity stored in the battery can then be released through the load. The advantage of doing this is that when the electricity price is the cheapest, the electrical energy of the power grid can be stored in the system. When the electricity price is high, the electricity of the power grid can be avoided, and the electricity of the battery can be used. Then, during the day, charging can be supplemented through photovoltaic power. The biggest advantage of this method compared to the currently popular energy storage solutions in the market is that it always uses the cheapest electricity, which is also a major highlight for the promotion of this system in areas with electricity supply.

[0083] Industrial frequency converter switching function / bypass control function. When the energy storage system is damaged or the battery power is too low during 50Hz operation, since there is still energy loss through the control of the rectifier module and the frequency converter, in order to maximize the use of energy, the system can also bypass the frequency converter and only control the operation of the pumping unit by the mains power / diesel power generation.

[0084] System self-diagnosis function. When the system is turned on, the system constantly judges whether each module is working properly through communication or data acquisition. Common system faults include a series of alarms such as system undervoltage, system overcurrent, output phase loss, abnormal charging of the photovoltaic module, abnormal charging of the fan module, abnormal rectifier module, frequency converter failure, and lack of oil in the diesel generator.

[0085] The present invention discloses an intelligent power generation and pumping control system for oil wells, which realizes complementary power generation and charging control of wind, light and diesel, and at the same time applies frequency conversion control to the operation of the pumping unit to achieve the purpose of intelligent integrated control. The present invention belongs to the fields of new energy power generation and motor control. This system includes a photovoltaic MPPT charging module, a wind turbine charging module, a rectification module, a frequency converter, a diesel generator, a BMS battery management module, an EMS energy management module, a touch screen display module, and an RTU communication module. This system mainly coordinates and controls the power generation power of each module through the EMS energy management module, and at the same time controls the operating states of each module through the voltage, SOC and load power of the BMS. The control of the present invention improves the utilization efficiency of wind and solar power generation, reduces the usage rate of oil engines, thereby achieving the purpose of energy conservation and consumption reduction. At the same time, it can also control the operating speed of the pumping unit according to the battery power status to achieve the best working state. The application of the present invention can replace the traditional method of simply using a diesel engine to generate electricity to drive the motor to pump oil in areas without electricity, so as to achieve the purpose of energy conservation and consumption reduction, and at the same time reduce the on-site maintenance cost (according to data statistics, fuel was needed every day before, and this system can replace it to refuel once a month, and even in some areas with better lighting conditions, it can be refueled once every three months or even half a year); in areas with electricity, this control system can be used as an energy storage system. During the day, the power generated by the photovoltaic and wind turbines is stored for load use, and at night when the electricity price is relatively low, the mains electricity can also be stored in the battery for load use. During operation, photovoltaic power generation and wind turbine power generation are preferentially used. When the energy is insufficient, the frequency conversion operation speed is reduced. At night when the electricity price is relatively low, the battery is charged through the rectification module, and at the same time the normal operation speed of the motor is restored.

[0086] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions can be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine task of design, manufacturing and production.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An oil well wind, solar and diesel intelligent power generation and oil pumping control system, characterized in that: include: Photovoltaic MPPT charging module, wind turbine charging module, rectifier module, inverter, diesel generator, BMS battery management module, EMS energy management module, touch screen display module, RTU communication module; The EMS energy management module is used to coordinate and control the power generation of the photovoltaic module, the fan module, the diesel generator and the rectifier module, giving priority to photovoltaic and fan power generation, and adjusting the operating status of each module according to the battery voltage, SOC and load power of the BMS; The system controls the pumping unit operation speed through the frequency converter, dynamically adjusts the frequency converter output frequency according to the battery power, and achieves energy saving and consumption reduction; The system also includes an intelligent fault diagnosis module before startup, which is used to detect the status of the charging circuit, the main circuit contactor, the communication module, the power supply module and the inverter control system; The diesel generator automatically starts when the battery power is low, and shuts down when the wind and solar power generation power meets the load demand; The rectifier module is used to balance the load power and the generated power, and to perform valley charging or emergency charging on the battery through the mains or a diesel generator.

2. The oil well wind, solar and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The intelligent fault diagnosis module comprises the following steps: Step A-1: ​​Start the load charging through the current limiting resistor, and delay the detection of the load voltage to determine whether the charging circuit is normal; Step A-2: If charging is normal, close the main circuit contactor and close the charging circuit, and read the voltage with a delay to determine the system power supply status; Step A-3: Read the status of each power supply module through the communication module and execute the module self-check program; Step A-4: When the photovoltaic and wind turbine power supply is normal, send a charging command and detect the operating status of the charging module; Step A-5: After the power supply is normal, send a running command to the inverter to detect the inverter control system status; Step A-6: When powered on, start the diesel generator and control the operation of the rectifier module, and detect the rectifier charging control state.

3. The oil well wind, solar and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The EMS energy management module calculates the average power consumption and hourly power consumption of the load by integration, and predicts the operating time of the controllable load in combination with the battery SOC value; when the battery power is lower than the threshold, the diesel generator is started and the output power of the rectifier module is adjusted by the load power integral value.

4. The oil well wind, solar and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The inverter intelligent control system comprises: Step C-1: Switching between continuous control mode and intermittent control mode according to the battery power and the output power of the charging module; Step C-2: Calculate the average operating power of the inverter by integration and limit the output power of the rectifier module; Step C-3: When the battery power is sufficient or the charging power is greater than the load power, the inverter runs at the set frequency; when the battery power is insufficient, it automatically runs at a reduced frequency.

5. The oil well wind, solar and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The start-stop logic of the diesel engine is: Automatically start the diesel generator when it detects that the battery voltage or power is below the threshold; When the wind and solar power generation power is greater than the sum of the variable frequency load power and the rectifier module power, the rectifier module is turned off and the diesel generator is stopped.

6. The oil well wind, solar, and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The power balance control of the rectifier module includes: Step D-1: Detect the load power and the accumulated average power, and ensure that the rectifier module power is greater than the two to prevent the battery power from continuously decreasing; Step D-2: When the rectifier power source is a diesel generator and the battery SOC>40% and the voltage is higher than the stop threshold, the rectifier module stops working; Step D-3: When the rectified power source is AC power and is in the valley charging period, start charging and limit the battery SOC to ≤ 60%, reserving the wind and solar charging capacity.

7. The oil well wind, solar, and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The wind-solar hybrid power generation control includes: Step E-1: The photovoltaic module uses MPPT control to track the maximum power generation, and the wind turbine and photovoltaic power generation power are limited by the battery power and charge and discharge current; Step E-2: Wind and solar power are used to supply the load first, and the excess power is stored in the battery.

8. The oil well wind, solar, and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: It also includes an energy storage time setting function, which starts the rectifier module during a preset period of time and charges it to a specified SOC value before stopping. It also shuts down the rectifier module during peak electricity price periods, giving priority to using the battery for power supply.

9. The oil well wind, solar, and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The system has an inverter bypass function. When the energy storage system fails or the battery power is too low, it switches to the mains or diesel generator to directly drive the oil pump.

10. The oil well wind, solar and diesel intelligent power generation and oil pumping control system according to claim 1 is characterized in that: The system self-diagnosis function detects the module status in real time. Fault types include system undervoltage, overcurrent, output phase loss, charging module abnormality, inverter failure and diesel generator oil shortage alarm.

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