Off-grid photovoltaic inverse control integrated cabinet for oil pumping unit

Abstract

The utility model belongs to the technical field of power electronic control, and particularly relates to an off-grid photovoltaic inverse control integrated cabinet for an oil pumping unit, which comprises a shell, and an energy storage system, an inversion control system and a frequency conversion system which are arranged in the shell, wherein the inversion control system is electrically connected with the energy storage system and the inversion control system respectively; the inversion control system is connected with the photovoltaic control assembly, and the frequency conversion system is connected with the oil pumping unit. According to the utility model, through simplifying the topological structure of the off-grid device, the photovoltaic inversion device and the energy storage inversion device are combined into one, thereby realizing stable operation of the oil pumping unit in an off-grid environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronic control, and in particular relates to an off-grid photovoltaic inverter-control integrated cabinet for an oil pump. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Due to the remote location and complex environment of oil fields, the power supply of oil field pumping units often becomes an important challenge. Traditional solutions usually rely on large generators or independent photovoltaic, battery, photovoltaic inverter, energy storage inverter and other power equipment, which has the problems of large floor space, high maintenance cost, low power supply efficiency and poor environmental performance. It cannot meet the needs of modern oil field systems for power supply flexibility and reliability; when in an off-grid environment, it cannot effectively deal with power fluctuations.

[0004] According to the inventors, the problem of oil pumps not being able to work properly in off-grid environments can be solved by building distributed photovoltaic power stations around oil wells; however, how to ensure that oil pumps around remote oil wells can operate stably and reliably in off-grid distributed photovoltaic power station environments is a problem that needs to be solved urgently. Utility Model Content

[0005] To solve the above problems, the utility model proposes an off-grid photovoltaic inverter-controlled integrated cabinet for an oil pump, which simplifies the topological structure of the off-grid equipment, combines the photovoltaic inverter equipment and the energy storage inverter equipment into one, and realizes the stable operation of the oil pump in an off-grid environment.

[0006] According to some embodiments, the solution of the utility model provides an off-grid photovoltaic inverter-controlled integrated cabinet for an oil pump, which adopts the following technical solution:

[0007] An off-grid photovoltaic inverter-controlled integrated cabinet for an oil pump comprises a shell and an energy storage system, an inverter control system and a frequency conversion system arranged in the shell; wherein the inverter control system is electrically connected to the energy storage system and the inverter control system respectively; the inverter control system is connected to a photovoltaic control component, and the frequency conversion system is connected to the oil pump.

[0008] As a further technical limitation, the inverter control system includes at least a DC / DC conversion subsystem and a DC / AC inverter subsystem; the input end of the DC / DC conversion subsystem is connected to the photovoltaic control component, and the output end is connected to the energy storage system; the input end of the DC / AC inverter subsystem is respectively connected to the photovoltaic control component and the energy storage system, and the output end is connected to the frequency conversion system.

[0009] Furthermore, the DC / DC conversion subsystem adopts an independent modular design, and uses a DC coupling topology to connect the photovoltaic control component and the energy storage system.

[0010] Furthermore, the DC / AC inverter subsystem adopts a two-level three-phase full-bridge circuit.

[0011] As a further technical limitation, the inverter control system further includes an inverter control subsystem which is communicatively connected to the photovoltaic control assembly and the energy storage system respectively.

[0012] Furthermore, the communication connection between the photovoltaic control component and the energy storage system adopts GPRS, CDMA, LAN, Zigbee or wifi.

[0013] Furthermore, the frequency conversion system at least includes a frequency conversion control subsystem which is communicatively connected to the inverter control subsystem and the oil pumping unit respectively.

[0014] Furthermore, the communication connection between the inverter control subsystem and the oil pump adopts GPRS, CDMA, LAN, Zigbee or wifi.

[0015] Furthermore, the frequency conversion control subsystem performs frequency conversion processing on the alternating current received by the frequency conversion system according to the load size of the oil pumping unit electrically connected to the frequency conversion system.

[0016] As a further technical limitation, a lightning rod is arranged on the top of the shell, and a plurality of heat dissipation holes are arranged on the side wall.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model combines the inverter device in the traditional photovoltaic control component and the inverter device in the energy storage system into one, improves the structure of the photovoltaic inverter-control integrated cabinet, simplifies the structure of the integrated cabinet, and solves the technical problem of stable and reliable operation of the existing oil pumps around remote oil wells in an off-grid distributed photovoltaic power station environment; at the same time, according to the oil pump load and the inverter control system, the energy source of the oil pump is distributed; that is, when the sun is sufficient, the photovoltaic control component directly supplies energy to the oil pump, and stores the excess electric energy in the energy storage system, and at night or when the light is insufficient, the energy storage system supplies energy to the oil pump, thereby realizing the stable operation of the oil pump in an off-grid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 It is a structural schematic diagram of an off-grid photovoltaic inverter-control integrated cabinet for an oil pump in an embodiment of the utility model;

[0021] Figure 2 It is a control principle diagram of the inverter control system in the embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of the topological structure of the DC coupling in the embodiment of the utility model;

[0023] Figure 4 The figure is a schematic diagram of a topological structure of a DC / AC conversion subsystem in an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0028] In the present utility model, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.

[0029] Example

[0030] The embodiment of the utility model introduces an off-grid photovoltaic inverter-control integrated cabinet for an oil pump.

[0031] In order to solve the problems of discontinuous and unstable photovoltaic power supply in oil field well sites, large instantaneous fluctuations, and inconsistency and mismatch with the requirements of continuous and stable oil and gas production; this embodiment designs an off-grid photovoltaic inverter cabinet for oil pumps, which can effectively solve the problem of power supply for oil pumps under off-grid conditions.

[0032] This embodiment simplifies the structure of the traditional photovoltaic inverter and energy storage inverter, and can achieve a stable supply of electric energy to the oil pump under off-grid conditions only through the photovoltaic inverter-control integrated machine.

[0033] like Figure 1 The off-grid photovoltaic inverter-controlled integrated cabinet for an oil pump shown includes a shell and an energy storage system, an inverter control system and a frequency conversion system arranged in the shell; wherein the inverter control system is electrically connected to the energy storage system and the inverter control system respectively; the inverter control system is connected to the photovoltaic control component, and the frequency conversion system is connected to the oil pump.

[0034] It should be noted that the integrated inverter control cabinet proposed in this embodiment is suitable for oil fields equipped with photovoltaic power generation equipment, and can provide power for oil pumps to ensure stable and reliable operation of the oil pumps.

[0035] The working principle of the inverter control system in the off-grid photovoltaic inverter-control integrated cabinet for the oil pumping unit proposed in this embodiment is as follows: Figure 2 As shown, it includes a DC / DC conversion subsystem and a DC / AC inverter subsystem; the input end of the DC / DC conversion subsystem is connected to the photovoltaic control component, and the output end is connected to the energy storage system; the input end of the DC / AC inverter subsystem is connected to the photovoltaic control component and the energy storage system respectively, and the output end is connected to the frequency conversion system. For example, MPS0050, MPS0250, PWG2-50K and other inverter-integrated machines can be used.

[0036] In this embodiment, the DC / DC conversion subsystem adopts an independent modular design. Figure 3 The DC coupling topology connects the photovoltaic control component and the energy storage system, realizes seamless connection between the photovoltaic control component and the energy storage system, optimizes energy conversion efficiency, and significantly simplifies the complexity of traditional photovoltaic inverters and energy storage converters in terms of function.

[0037] In traditional photovoltaic power generation and energy storage systems, photovoltaic inverters are mainly used to convert the direct current generated by photovoltaic cells into alternating current for load use, while energy storage converters are responsible for the charge and discharge management of batteries. However, these devices usually have a single function and need to be configured separately, which increases the complexity and cost of the system.

[0038] This embodiment integrates the functions of photovoltaic inverter and energy storage converter into one device (i.e., inverter control system), thereby eliminating the need for independent inverters and converters; the DC / DC conversion module can directly process the direct current from the photovoltaic control component and stably convert it into a voltage and current suitable for charging the energy storage system or using the load; in this process, this embodiment adopts constant voltage / constant current control technology to further ensure the stability and safety of the oil pump.

[0039] The photovoltaic-storage integrated machine can be connected to the photovoltaic control component and the energy storage system at the same time. It can effectively manage the energy from different power sources and intelligently distribute it according to system requirements. That is, when there is sufficient sunlight, the photovoltaic control component directly supplies energy to the oil pump and stores the excess electricity in the energy storage system. At night or when there is insufficient light, the energy storage system supplies energy to the oil pump, thereby achieving stable operation of the oil pump in an off-grid environment.

[0040] The DC / AC conversion subsystem in this embodiment adopts Figure 4 The two-level three-phase full-bridge topology shown in the figure performs constant voltage and frequency control when operating off-grid to provide a stable AC power supply for the oil pumping unit.

[0041] Taking into account the characteristic of excessive starting current of oil field pumping units, the frequency conversion system can achieve soft starting of the pumping unit, reduce the impact current during startup, and extend the service life of the equipment; at the same time, the frequency conversion system has overload, overvoltage, undervoltage and other protection functions to ensure the safe and stable operation of the pumping unit.

[0042] In actual application, it is only necessary to connect the existing photovoltaic power source on site to the off-grid photovoltaic inverter cabinet for the oil pump proposed in this embodiment, which can quickly provide a stable and reliable power supply for the oil pump; it greatly simplifies the complexity of on-site wiring, reduces the possibility of errors during the installation process, and improves the reliability and ease of use of the system.

[0043] This embodiment combines the inverter device in the traditional photovoltaic control component and the inverter device in the energy storage system into one, improves the structure of the photovoltaic inverter-control integrated cabinet, simplifies the structure of the integrated cabinet, and at the same time, solves the technical problem of stable and reliable operation of the existing oil pumps around remote oil wells in an off-grid distributed photovoltaic power station environment; at the same time, according to the oil pump load and the inverter control system, the energy source of the oil pump is allocated; that is, when the sun is sufficient, the photovoltaic control component directly supplies energy to the oil pump, and stores the excess electrical energy in the energy storage system, and at night or when there is insufficient light, the energy storage system supplies energy to the oil pump, thereby achieving stable operation of the oil pump in an off-grid environment.

[0044] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units, characterized in that: It includes a shell and an energy storage system, an inverter control system and a frequency conversion system arranged in the shell; wherein the inverter control system is electrically connected to the energy storage system and the inverter control system respectively; the inverter control system is connected to a photovoltaic control component, and the frequency conversion system is connected to an oil pump.

2. An off-grid photovoltaic inverter-control integrated cabinet for an oil pump as claimed in claim 1, characterized in that: The inverter control system includes at least a DC / DC conversion subsystem and a DC / AC inverter subsystem; the input end of the DC / DC conversion subsystem is connected to the photovoltaic control component, and the output end is connected to the energy storage system; the input end of the DC / AC inverter subsystem is respectively connected to the photovoltaic control component and the energy storage system, and the output end is connected to the frequency conversion system.

3. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 2, characterized in that: The DC / DC conversion subsystem adopts an independent modular design and uses a DC coupling topology to connect the photovoltaic control component and the energy storage system.

4. An off-grid photovoltaic inverter-control integrated cabinet for an oil pump as claimed in claim 2, characterized in that: The DC / AC inverter subsystem adopts a two-level three-phase full-bridge circuit.

5. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 1, characterized in that: The inverter control system also includes an inverter control subsystem that is communicatively connected to the photovoltaic control assembly and the energy storage system respectively.

6. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 5, characterized in that: The communication connection between the photovoltaic control component and the energy storage system adopts GPRS, CDMA, LAN, Zigbee or wifi.

7. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 5, characterized in that: The frequency conversion system at least includes a frequency conversion control subsystem which is communicatively connected to the inverter control subsystem and the oil pumping unit respectively.

8. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 7, characterized in that: The communication connection between the inverter control subsystem and the oil pump adopts GPRS, CDMA, LAN, Zigbee or wifi.

9. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 7, characterized in that: The frequency conversion control subsystem performs frequency conversion processing on the alternating current received by the frequency conversion system according to the load size of the oil pumping unit electrically connected to the frequency conversion system.

10. An off-grid photovoltaic inverter-control integrated cabinet for oil pumping units as claimed in claim 1, characterized in that: A lightning rod is arranged on the top of the shell, and a plurality of heat dissipation holes are arranged on the side wall.

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