A photovoltaic power generation and frequency conversion energy saving device for oil fields

Abstract

The present application discloses a device for driving frequency conversion energy saving for photovoltaic power generation in oil fields, which relates to the technical field of frequency conversion energy saving of photovoltaic power generation. The power change value, temperature change value and output frequency of the inverter of the photovoltaic power generation module within the monitoring period are monitored and analyzed, and the monitoring threshold is processed with different monitoring values ​​by comparison with the preset value to evaluate the power consumption of the photovoltaic power generation module within the monitoring period. Therefore, the power consumption of the photovoltaic power generation module carried by the oil field exploitation equipment can be effectively evaluated, the consumption rate of the photovoltaic power generation module can be warned in advance, and the pumping unit motor can be forcibly protected according to the power consumption, so as to prevent the photovoltaic power generation module from affecting the oil field exploitation work due to sudden power failure when the power is supplied.

Description

Technical Field

[0001] The present application relates to the technical field of variable frequency energy-saving control of photovoltaic power generation, and in particular to a device for driving variable frequency energy-saving photovoltaic power generation in oil fields. Background Art

[0002] Oilfield pumping units are one of the most commonly used oil extraction machines and are also a major power consumer in oilfields, accounting for about 40% of the total electricity consumption in oilfields. my country has more than 100,000 pumping units, consuming more than 10 billion kW·h of electricity each year. Conventional oilfield pumping units use low-speed, high-efficiency, and reliable inverters for energy saving. Since oilfields are located in remote areas, far away from urban power supply systems, this will place extremely high demands on the radiation capacity of power systems in remote areas, greatly increasing the cost of oil extraction in oilfields.

[0003] In order to reduce the electric energy consumed by oil field production, the existing technology uses photovoltaic power generation units to provide the required electric energy for the operation of mining equipment. The factors affecting the storage power of photovoltaic power generation units mainly include the following aspects:

[0004] Weather conditions: Photovoltaic power generation converts solar energy into electrical energy, so weather conditions are one of the main factors affecting the efficiency of photovoltaic power generation. The light intensity on sunny days and cloudy days is different. On sunny days, the solar energy is more abundant, and the photovoltaic power generation efficiency is higher. On cloudy or overcast days, the photovoltaic power generation efficiency will decrease.

[0005] Sunshine time: The length of sunshine time directly affects the working time and light intensity of the photovoltaic power generation unit, thus affecting the amount of electricity it generates. In winter, the sunshine time is shorter, and the photovoltaic power generation is correspondingly reduced; in summer, the sunshine time is longer, and the photovoltaic power generation is correspondingly increased.

[0006] Solar altitude angle: The solar altitude angle will also affect the efficiency of photovoltaic power generation. The higher the solar altitude angle, the greater the light intensity and the higher the photovoltaic power generation efficiency.

[0007] Temperature: The operating temperature of photovoltaic cells will also affect their power generation efficiency. Generally speaking, the lower the temperature of the photovoltaic cells, the higher their power generation efficiency. However, in extremely low or high temperature environments, the power generation efficiency of photovoltaic cells will decrease.

[0008] Therefore, when the photovoltaic power generation unit is affected by external factors and its power storage is affected, it is necessary to monitor the power consumption status of the photovoltaic single power generation unit when it is supplying power to prevent a major impact on oil field exploitation when the power is suddenly exhausted. Therefore, how to effectively evaluate the power consumption of the photovoltaic power generation module carried by the oil field exploitation equipment, give early warning of the consumption rate of the photovoltaic power generation module, and perform mandatory protection of the oil pump motor according to the power consumption level is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0009] In an exemplary embodiment of the present application, a photovoltaic power generation device for driving frequency conversion energy saving in oil fields is provided, which effectively evaluates the power consumption of the photovoltaic power generation modules carried by the oil field production equipment, gives an early warning of the consumption rate of the photovoltaic power generation modules, and performs forced protection on the pumping unit motor according to the power consumption level, thereby preventing the photovoltaic power generation modules from affecting the oil field production work due to sudden power outages when supplying power.

[0010] The present application provides a photovoltaic power generation and frequency conversion energy-saving device for oil fields, comprising:

[0011] A first isolating switch, a second isolating switch, a first relay, a second relay, a photovoltaic power generation module, a DC-AC converter, a frequency converter, an oil pumping unit motor and a controller;

[0012] The first isolating switch and the first relay are arranged between the input end of the photovoltaic power generation module and the photovoltaic power station, the output end of the photovoltaic power generation module is connected to the DC-AC converter, the second isolating switch and the second relay are arranged between the DC-AC converter and the frequency converter, and the output end of the frequency converter is connected to the pumping unit motor;

[0013] The photovoltaic power generation module includes a power control module and a temperature sensor, wherein the power control module is used to obtain the current power value of the photovoltaic power generation module, and the temperature sensor is used to obtain the current temperature value of the photovoltaic power generation module;

[0014] The controller is configured to: determine the power change value of the photovoltaic power generation module within the monitoring period, determine the temperature change value of the photovoltaic power generation module within the monitoring period, determine the average output frequency of the inverter within the monitoring period, and judge the magnitude relationship between the power change value and the preset power value, the magnitude relationship between the temperature change value and the preset temperature value, and the magnitude relationship between the average output frequency and the preset frequency value; if the power change value is greater than the preset power value, add the first monitoring value to the monitoring threshold value, if the temperature change value is greater than the preset temperature value, add the first monitoring value to the monitoring threshold value, and if the average output frequency is greater than the preset frequency value, add the second monitoring value to the monitoring threshold value, and the second monitoring value is greater than the first monitoring value;

[0015] The controller is also configured to: determine the size relationship between the monitoring threshold and the initial threshold after the monitoring cycle ends; if the monitoring threshold is greater than or equal to the initial threshold, drive the alarm unit to work and limit the current output frequency of the inverter to no more than 60% of the average output frequency.

[0016] Furthermore, the controller is also configured to: if the monitoring threshold is greater than or equal to the initial threshold, drive the alarm unit to work and limit the current output frequency of the inverter to no more than 60% of the average output frequency, wherein the duration of limiting the current output frequency of the inverter to no more than 60% of the average output frequency is greater than the duration of the monitoring period.

[0017] Furthermore, the controller is also configured to: accumulate the monitoring threshold with the first monitoring value or the first monitoring value, and determine the magnitude relationship between the accumulated monitoring threshold and the initial threshold.

[0018] Furthermore, the second monitoring value is 4 times the first monitoring threshold.

[0019] Furthermore, the initial threshold is 50% of the sum of the first monitoring value and the second monitoring value.

[0020] Furthermore, the alarm unit is a warning light or a buzzer.

[0021] Furthermore, the first relay is a DC relay, and the second relay is an AC relay.

[0022] The embodiments of the present application have the following beneficial effects: monitoring and analyzing the power change value, temperature change value and output frequency of the inverter of the photovoltaic power generation module within the monitoring period, and processing the monitoring threshold with different monitoring values ​​by comparing with the preset value, so as to evaluate the power consumption of the photovoltaic power generation module within the monitoring period, thereby effectively evaluating the power consumption of the photovoltaic power generation module carried by the oil field exploitation equipment, giving an advance warning of the consumption rate of the photovoltaic power generation module, and forcibly protecting the pumping unit motor according to the power consumption, so as to prevent the photovoltaic power generation module from affecting the oil field exploitation work due to sudden power outage when powering on. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 The hardware connection diagram of a photovoltaic power generation and frequency conversion energy saving device for oil fields provided in an embodiment of the present application is exemplarily shown;

[0025] Figure 2 A schematic diagram of a photovoltaic power generation and frequency conversion energy-saving device system for oil fields provided in an embodiment of the present application is exemplified. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0027] To further illustrate the technical solution provided by the embodiment of the present application, this is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiment of the present application provides the method operation steps shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided in the embodiment of the present application.

[0028] refer to Figure 1-2 As shown, the present application provides a photovoltaic power generation driven frequency conversion energy-saving device for oil fields, including: a first isolating switch QS1, a second isolating switch QS2, a first relay KM1, a second relay KM2, a photovoltaic power generation module 11, a DC-AC converter 12, a frequency converter 13, an oil pump motor 14 and a controller 15.

[0029] A first isolating switch QS1 and a first relay KM1 are arranged between the input end of the photovoltaic power generation module 11 and the photovoltaic power station 16. The photovoltaic power station 16 sends out 400V direct current. When the first isolating switch QS1 and the first relay KM1 are closed under the control of the controller 15, conduction between the photovoltaic power station 16 and the photovoltaic power generation module 11 can be achieved, and the photovoltaic power generation module 11 can acquire, store and transmit the direct current sent out by the photovoltaic power station 16 to the outside.

[0030] The photovoltaic power generation module 11 includes a power control module 111 and a temperature sensor 112. The power control module 111 is used to obtain the current power value of the photovoltaic power generation module 11, wherein the current power value refers to the remaining power value in the photovoltaic power generation module 11. The temperature sensor 112 is used to obtain the current temperature value of the photovoltaic power generation module 11. The temperature sensor 112 is arranged inside the photovoltaic power generation module 11 and is used to detect the temperature value inside the photovoltaic power generation module 11.

[0031] The output end of the photovoltaic power generation module 11 is connected to the DC-AC converter 12, and a second isolating switch QS2 and a second relay KM2 are arranged between the DC-AC converter 12 and the frequency converter 13, wherein the first relay KM1 is a DC relay, and the second relay KM2 is an AC relay. The output end of the frequency converter 13 is connected to the oil pump motor 14, and the DC-AC converter 12 converts DC power into AC power. The second isolating switch QS2 and the second relay KM2 are closed under the control of the controller 15 to realize the conduction between the DC-AC converter 12 and the frequency converter 13, so that the converted AC power drives the oil pump motor 14 under the frequency conversion control of the frequency converter 13 to work with frequency conversion industrial control, thereby driving the oil pump to work for oil extraction, wherein the frequency converter 13 is connected to the controller 15 and the controller 15 can obtain the current output frequency of the frequency converter 13.

[0032] The controller 15 is configured to: determine the power change value of the photovoltaic power generation module 11 within the monitoring period, determine the temperature change value of the photovoltaic power generation module 11 within the monitoring period, and determine the average output frequency of the inverter 13 within the monitoring period. The monitoring period is a preset monitoring time period. The photovoltaic power generation module 11 can be partitioned and monitored in multiple monitoring periods within the working range of the photovoltaic power generation module 11, thereby improving the granularity of the monitoring time period and refining the evaluation and analysis of the power consumption level.

[0033] Among them, the power change value refers to the absolute value of the difference between the current power value of the photovoltaic power generation module 11 at the initial moment and the end moment of the monitoring period, and the temperature change value refers to the absolute value of the difference between the current temperature value of the photovoltaic power generation module 11 at the initial moment and the end moment of the monitoring period. For example, if the monitoring period is 600s, the initial moment is the 1st second, and the end moment is the 600th second. The current power value and the current temperature value at the 1st second and the 600th second are determined respectively, and the power change value and the temperature change value are determined respectively by the absolute value of the difference.

[0034] The direct current delivered by the photovoltaic power generation module 11 is converted by the direct current to the alternating current converter 12 and then delivered to the frequency converter 13, wherein the frequency converter 13 controls and adjusts the working frequency used to drive the oil pumping motor 14 in the working state, so as to drive the oil pumping motor 14 to operate in a variable frequency condition, and meet different requirements for working frequency in different stages or different working conditions. The processor determines the average output frequency of the frequency converter 13 within the monitoring period, and the average output frequency is the average value of multiple output frequencies obtained by the processor within the monitoring period.

[0035] The controller 15 is configured to: determine the relationship between the power change value and the preset power value, the relationship between the temperature change value and the preset temperature value, and the relationship between the average output frequency and the preset frequency value, and determine the power consumption level of the photovoltaic power generation module 11 based on the relationship between the power change value, the temperature change value and the average output frequency and the preset value, so as to perform evaluation and quantitative feedback.

[0036] If the power change value is greater than the preset power value, the first monitoring value is added to the monitoring threshold; otherwise, the monitoring threshold is maintained unchanged.

[0037] If the temperature change value is greater than the preset temperature value, the first monitoring value is added to the monitoring threshold value; otherwise, the monitoring threshold value is maintained unchanged.

[0038] If the average output frequency is greater than the preset frequency value, the second monitoring value is added to the monitoring threshold, otherwise, the monitoring threshold is maintained unchanged, the second monitoring value is greater than the first monitoring value, and both the second monitoring value and the first monitoring value are greater than 0.

[0039] When the power change value is greater than the preset power, or the temperature change value is greater than the preset temperature value, or the average output frequency is greater than the preset frequency value, the monitoring threshold is added with the first monitoring value or the second monitoring value, and the power consumption of the photovoltaic power generation module 11 can be quantitatively evaluated by the power change value, temperature change value or average output frequency.

[0040] The controller 15 is also configured to: determine the size relationship between the monitoring threshold and the initial threshold after the monitoring cycle ends, wherein the monitoring threshold is accumulated with the first monitoring value or the first monitoring value, and the size relationship between the accumulated monitoring threshold and the initial threshold is determined, that is, the monitoring threshold after the first monitoring value and the second monitoring value are accumulated and processed according to the size judgment and the initial threshold are determined. If the monitoring threshold is greater than or equal to the initial threshold, the alarm unit 17 is driven to work and the current output frequency of the inverter 13 is limited to no more than 60% of the average output frequency. Otherwise, the alarm unit 17 is not driven to work and the current output frequency is maintained unchanged.

[0041] The alarm unit 17 is a warning light or a buzzer. By driving the alarm unit 17 to work and feedback a light signal or a sound signal, the staff can be fed back with feedback on the current power consumption of the photovoltaic power generation module 11 to remind the staff that the current power consumption is high and the stored power of the photovoltaic power generation module 11 may be quickly consumed.

[0042] At the same time, when the monitoring threshold is greater than or equal to the initial threshold, the current output frequency limit of the frequency converter 13 is reduced and limited to no more than 60% of the average output frequency determined during the monitoring period. The duration of limiting the current output frequency of the frequency converter 13 to no more than 60% of the average output frequency is greater than the duration of the monitoring period. This ensures that the frequency converter 13 can drive the oil pump motor 14 to work at a lower output frequency during the next complete monitoring period, thereby achieving a smooth low-frequency working transition.

[0043] After judging the average output frequency, power change value and temperature change value during the monitoring period, the overall power consumption of the entire domain during the monitoring period is evaluated by judging the monitoring threshold and the initial threshold.

[0044] Furthermore, the second monitoring value is 4 times the first monitoring value, that is, if the average output frequency is greater than the preset frequency value, the increase in the monitoring threshold is much greater than the increase in the monitoring threshold when the power change value is greater than the preset power, or the temperature change value is greater than the preset temperature value.

[0045] The initial threshold is 50% of the sum of the first monitoring value and the second monitoring value, and the monitoring threshold is 0. After the judgment of each parameter is completed in each monitoring cycle, the monitoring threshold is cleared and reset to 0. That is, the monitoring threshold in each monitoring cycle is accumulated from 0. In this way, the monitoring thresholds corresponding to various situations after the average output frequency, power change value and temperature change value are judged in the monitoring cycle can be reasonably judged and distinguished, and then different power consumption levels can be evaluated.

[0046] For example, the first monitoring value is 5, and the second monitoring value is 20, thereby determining the initial threshold value to be 12.5.

[0047] For example, if the power change value is greater than the preset power value, the first monitoring value is added to the monitoring threshold, and if the temperature change value is not greater than the preset temperature value, and the average output frequency is not greater than the preset frequency value, then a first monitoring value and the monitoring threshold are accumulated, that is, the monitoring threshold is adjusted to 5, which is less than the initial threshold. At this time, the power consumption is relatively small, and the controller 15 is not required to drive the alarm unit 17 to work and maintain the current output frequency to drive the oil pump motor 14 to work.

[0048] For example, if the power change value is not greater than the preset power value, and if the temperature change value is greater than the preset temperature value, the first monitoring value is added to the monitoring threshold, and the average output frequency is not greater than the preset frequency value, then a first monitoring value and the monitoring threshold are accumulated, that is, the monitoring threshold is adjusted to 5, which is less than the initial threshold. At this time, the power consumption is relatively small, and the controller 15 is not required to drive the alarm unit 17 to work and maintain the current output frequency to drive the oil pump motor 14 to work.

[0049] For example, if the power change value is greater than the preset power value, the first monitoring value is added to the monitoring threshold, and if the temperature change value is greater than the preset temperature value, the first monitoring value is added to the monitoring threshold, and if the average output frequency is not greater than the preset frequency value, the two first monitoring values ​​and the monitoring threshold are accumulated, that is, the monitoring threshold is adjusted to 10, which is less than the initial threshold. At this time, the power consumption is relatively small, and there is no need for the controller 15 to drive the alarm unit 17 to work and maintain the current output frequency to drive the oil pump motor 14 to work.

[0050] For example, if the power change value is not greater than the preset power value, and if the temperature change value is not greater than the preset temperature value, and the average output frequency is greater than the preset frequency value, then a second monitoring value and the monitoring threshold are accumulated and processed, that is, the monitoring threshold is adjusted to 20, which is greater than the initial threshold. At this time, the power consumption is relatively large, and the controller 15 is required to drive the alarm unit 17 to work and limit the current output frequency of the inverter 13.

[0051] For example, if the power change value is greater than the preset power value or the temperature change value is greater than the preset temperature value, a first monitoring value is added to the monitoring threshold, and the average output frequency is greater than the preset frequency value, then a second monitoring value and the monitoring threshold are accumulated, that is, the monitoring threshold is adjusted to 25, which is greater than the initial threshold. At this time, the power consumption is relatively large, and the controller 15 is required to drive the alarm unit 17 to work and limit the current output frequency of the inverter 13.

[0052] For example, if the power change value is greater than the preset power value and the temperature change value is greater than the preset temperature value, the two first monitoring values ​​are added to the monitoring threshold, and the average output frequency is greater than the preset frequency value, then a second monitoring value and the monitoring threshold are accumulated, that is, the monitoring threshold is adjusted to 30, which is greater than the initial threshold. At this time, the power consumption is relatively large, and the controller 15 is required to drive the alarm unit 17 to work and limit the current output frequency of the inverter 13.

[0053] In this way, the power change value, temperature change value and output frequency of the inverter 13 of the photovoltaic power generation module 11 within the monitoring period are monitored and analyzed, and the monitoring threshold is processed with different monitoring values ​​by comparison with the preset value, so as to evaluate the power consumption of the photovoltaic power generation module 11 within the monitoring period. Therefore, the power consumption of the photovoltaic power generation module 11 carried by the oil field exploitation equipment can be effectively evaluated, the consumption rate of the photovoltaic power generation module 11 can be warned in advance, and the pumping unit motor 14 can be forcibly protected according to the power consumption, so as to prevent the photovoltaic power generation module 11 from affecting the oil field exploitation work due to sudden power outage when powering on.

[0054] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0055] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0056] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0057] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0058] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A photovoltaic power generation and frequency conversion energy saving device for oil fields, characterized in that: include: A first isolating switch, a second isolating switch, a first relay, a second relay, a photovoltaic power generation module, a DC-AC converter, a frequency converter, an oil pumping unit motor and a controller; The first isolating switch and the first relay are arranged between the input end of the photovoltaic power generation module and the photovoltaic power station, the output end of the photovoltaic power generation module is connected to the DC-AC converter, the second isolating switch and the second relay are arranged between the DC-AC converter and the frequency converter, and the output end of the frequency converter is connected to the pumping unit motor; The photovoltaic power generation module includes a power control module and a temperature sensor, wherein the power control module is used to obtain the current power value of the photovoltaic power generation module, and the temperature sensor is used to obtain the current temperature value of the photovoltaic power generation module; The controller is configured to: determine the power change value of the photovoltaic power generation module within the monitoring period, determine the temperature change value of the photovoltaic power generation module within the monitoring period, determine the average output frequency of the inverter within the monitoring period, and judge the magnitude relationship between the power change value and the preset power value, the magnitude relationship between the temperature change value and the preset temperature value, and the magnitude relationship between the average output frequency and the preset frequency value; If the power change value is greater than the preset power value, the first monitoring value is added to the monitoring threshold value; if the temperature change value is greater than the preset temperature value, the first monitoring value is added to the monitoring threshold value; if the average output frequency is greater than the preset frequency value, the second monitoring value is added to the monitoring threshold value, and the second monitoring value is greater than the first monitoring value; The controller is further configured to: determine the magnitude relationship between the monitoring threshold and the initial threshold after the monitoring period ends, wherein the monitoring threshold is accumulated with the first monitoring value or the first monitoring value, and the magnitude relationship between the accumulated monitoring threshold and the initial threshold is determined; If the monitoring threshold is greater than or equal to the initial threshold, the alarm unit is driven to operate and the current output frequency of the inverter is limited to not more than 60% of the average output frequency.

2. The device according to claim 1, characterized in that The controller is also configured to: if the monitoring threshold is greater than or equal to the initial threshold, drive the alarm unit to work and limit the current output frequency of the inverter to no more than 60% of the average output frequency, wherein the duration of limiting the current output frequency of the inverter to no more than 60% of the average output frequency is greater than the duration of the monitoring period.

3. The device according to claim 2, characterized in that The second monitoring value is 4 times the first monitoring value.

4. The device according to claim 3, characterized in that The initial threshold is 50% of the sum of the first monitoring value and the second monitoring value.

5. The device according to claim 1, characterized in that The alarm unit is a warning light or a buzzer.

6. The device according to claim 1, characterized in that The first relay is a DC relay, and the second relay is an AC relay.

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