Power frequency or variable frequency bidirectional automatic switching control device

Abstract

The utility model belongs to the field of electrical control, particularly relates to a power frequency or frequency conversion bidirectional automatic switching control device, and aims to solve the problems that the time rate of an oil well is influenced, the labor intensity of workers is increased, and meanwhile, the oil well with a complicated geological structure is extremely easy to lie due to production stop of the oil well. According to the utility model, a communication module is connected with a network conversion module; the switching enabling module is connected with a digital output interface of the frequency converter; the contactor control module is connected with control circuits of the power frequency contactor and the variable frequency output contactor; the frequency converter control module is connected with the frequency converter starting circuit; two contacts of the power supply zero-crossing detection module are respectively connected with a phase live wire and a zero wire of the control cabinet power supply; and the frequency converter output zero-cross detection module is connected with one phase of three-phase output of the frequency converter and a power supply zero line. When power frequency operation is switched to variable frequency operation, remote impact-free switching can be achieved, energy is saved, consumption is reduced, labor intensity of workers is reduced, the service life of the frequency converter is prolonged, and oil well lying is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of electrical control, and particularly relates to a power frequency or variable frequency bidirectional automatic switching control device. Background Technique

[0002] At present, the control cabinets for operating oil well motors used in oil fields have two circuits, namely power frequency and variable frequency circuits, and one of the circuits operates according to the on-site process requirements. Due to the need for process parameter adjustment in oil wells, the frequency converter operates at 0 - 50Hz. When the frequency converter of the oil well runs to 50Hz, if it always runs at variable frequency, it will cause waste of electric energy, and it must be switched to power frequency operation in time. This can not only save electric energy but also extend the service life of the frequency converter. The current switching method is that workers go to the site to stop the operation of the oil well, and the control cabinet is switched from variable frequency operation to power frequency operation. This not only affects the oil well time rate but also increases the labor intensity of workers. At the same time, oil wells with complex geological structures are extremely prone to "lying wells" caused by the stop of oil well production.

[0003] When the on-site oil well control cabinet is switched from power frequency to variable frequency operation, it is necessary for the operator to stop the power frequency operation on-site. After the pumping unit stops stably, start the variable frequency operation. This operation not only affects the oil well time rate but also increases the labor intensity of workers. At the same time, oil wells with complex geological structures are extremely prone to "lying wells" caused by the stop of oil well production.

[0004] Based on this, the utility model proposes a power frequency or variable frequency bidirectional automatic switching control device. Content of the Utility Model

[0005] In order to solve the above problems in the prior art, that is, affecting the oil well time rate, increasing the labor intensity of workers, and at the same time, oil wells with complex geological structures are extremely prone to "lying wells" caused by the stop of oil well production, the utility model provides a power frequency or variable frequency bidirectional automatic switching control device, which includes a controller and each sub-module connected to the controller. Each sub-module includes a communication module, a switching enable module, a power supply module, a contactor control module, a frequency converter control module, a power supply zero-crossing detection module, and a frequency converter output zero-crossing detection module;

[0006] The communication module is connected to the transfer network module, and the transfer network module is connected to the production network; the switching enable module is connected to the digital output interface of the frequency converter and is used to receive the frequency arrival signal of the frequency converter; the power supply module is connected to the power supply circuit in the control cabinet; the contactor control module is connected to the control circuits of the power frequency contactor and the variable frequency output contactor and is used to control the suction or disconnection of the power frequency contactor and the variable frequency output contactor;

[0007] The frequency converter control module is connected to the frequency converter starting circuit; Two contacts of the power supply zero-crossing detection module are respectively connected to a live wire and a neutral wire of the control cabinet power supply; One contact of the frequency converter output zero-crossing detection module is connected to one phase of the three-phase output of the frequency converter, and the other contact of the frequency converter output zero-crossing detection module is connected to the power supply neutral wire.

[0008] In some preferred embodiments, the first end of the communication module is connected to the controller, and the second end of the communication module includes a first communication interface and a second communication interface;

[0009] Both the first communication interface and the second communication interface are connected to the network conversion module.

[0010] In some preferred embodiments, the first end of the switching enable module is connected to the controller, and the second end of the switching enable module includes a first enable interface and a second enable interface;

[0011] Both the first enable interface and the second enable interface are connected to the frequency converter digital output interface.

[0012] In some preferred embodiments, the first end of the power supply module is connected to the controller, and the second end of the power supply module includes an L contact and an N contact;

[0013] The L contact is connected to the live wire of the power supply circuit in the control cabinet, and the N contact is connected to the neutral wire of the power supply circuit in the control cabinet.

[0014] In some preferred embodiments, the first end of the contactor control module is connected to the controller, and the second end of the contactor control module includes a first contactor control contact and a second contactor control contact;

[0015] The first contactor control contact and the second contactor control contact are respectively connected to the industrial frequency contactor and the frequency conversion output contactor control circuit.

[0016] In some preferred embodiments, the first end of the frequency converter control module is connected to the controller, and the second end of the frequency converter control module includes a first frequency converter control contact and a second frequency converter control contact;

[0017] The first frequency converter control contact and the second frequency converter control contact are respectively connected to the frequency converter starting circuit.

[0018] In some preferred embodiments, the first end of the power supply zero-crossing detection module is connected to the controller, and the second end of the power supply zero-crossing detection module includes a first power supply zero-crossing detection output contact and a second power supply zero-crossing detection output contact;

[0019] The first power supply zero-crossing detection output contact is connected to a live wire of a phase of the control cabinet power supply, and the second power supply zero-crossing detection output contact is connected to a neutral wire of a phase of the control cabinet power supply.

[0020] In some preferred embodiments, a first end of the inverter output zero-crossing detection module is connected to the controller, and a second end of the inverter output zero-crossing detection module includes a first inverter output zero-crossing detection contact and a second inverter output zero-crossing detection contact;

[0021] The first inverter output zero-crossing detection contact is connected to one of the three-phase outputs of the inverter, and the second inverter output zero-crossing detection contact is connected to the power supply neutral wire.

[0022] In some preferred embodiments, a display screen is further included, and the display screen is connected to the controller, and the display screen is used for displaying the operating state and fault information.

[0023] In some preferred embodiments, the conversion network module is an RS485 conversion network module, and both the first communication interface and the second communication interface are RS485 communication interfaces.

[0024] Advantages of the present utility model:

[0025] Improve efficiency and reduce labor costs: Through the automatic switching function, there is no need for manual on-site operation to switch, reducing the labor intensity of workers and improving work efficiency; the automated process avoids the additional time and resource consumption caused by workers traveling back and forth to the site.

[0026] Reduce the oil well shutdown time: Achieve smooth switching between power frequency and frequency conversion, without waiting for the pumping unit to come to a complete stop before starting, reducing the oil well shutdown time caused by switching, and thus improving the operating efficiency and output of the oil well.

[0027] Energy saving and equipment protection: When the inverter runs to the maximum frequency (50Hz), automatically switching to the power frequency mode can effectively save electric energy and help extend the service life of the inverter. Avoid unnecessary energy waste and contribute to environmental protection.

[0028] Adapt to complex geological conditions: For oil wells with complex geological structures, this device reduces the risk of well lying caused by frequent shutdowns, enhancing the stability and reliability of the system. Through intelligent management, the risk of oil well operation under complex conditions is reduced.

[0029] Enhance monitoring and maintenance capabilities: The integrated display screen can display the operating state and fault information in real time, facilitating remote monitoring and maintenance, promptly discovering and handling problems, and further ensuring the normal operation of the system.

[0030] Flexible communication capabilities: The RS485 to network module enables the device to easily access the existing production network, facilitating data collection and remote control, and enhancing the integration and scalability of the entire system. Description of the Drawings

[0031] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0032] Figure 1 It is a schematic structural diagram of a power frequency or variable frequency bidirectional automatic switching control device of the present utility model. Detailed Embodiments

[0033] The following further describes the present application in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model and are not intended to limit the utility model. Additionally, it should be noted that for the sake of description, only the parts related to the relevant utility model are shown in the drawings.

[0034] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and embodiments.

[0035] As Figure 1 shown, the present utility model provides a power frequency or variable frequency bidirectional automatic switching control device, including a controller 1 and each sub-module connected to the controller 1. Each sub-module includes a communication module 2, a switching enable module 3, a power supply module 4, a contactor control module 5, a frequency converter control module 6, a power supply zero-crossing detection module 7, and a frequency converter output zero-crossing detection module 8;

[0036] The communication module 2 is connected to the network conversion module, and the network conversion module is connected to the production network; the switching enable module 3 is connected to the digital output interface of the frequency converter for receiving the frequency converter frequency arrival signal; the power supply module 4 is connected to the power supply circuit in the control cabinet; the contactor control module 5 is connected to the control circuits of the power frequency contactor and the variable frequency output contactor for controlling the suction or disconnection of the power frequency contactor and the variable frequency output contactor. The two contactors must be interlocked to prevent simultaneous suction;

[0037] The frequency converter control module 6 is connected to the frequency converter startup circuit; the two contacts of the power supply zero-crossing detection module 7 are respectively connected to a phase of the live wire and the neutral wire of the control cabinet power supply; one contact of the frequency converter output zero-crossing detection module 8 is connected to one of the three-phase outputs of the frequency converter, and the other contact of the frequency converter output zero-crossing detection module 8 is connected to the power supply neutral wire.

[0038] Among them, the controller 1 is preferably a single-chip microcomputer in this embodiment.

[0039] The control device in this utility model further includes a display screen 9, and the display screen 9 is connected to the controller 1, and the display screen 9 is used for displaying the operating state and fault information.

[0040] The power supply module 4 in this utility model supplies power to the entire control device. When switching from variable-frequency operation to power-frequency operation, after the frequency converter runs to 50Hz, the switching enable module 3 receives the digital signal that the frequency of the frequency converter reaches. At the same time, a signal is given to the controller 1 that the output frequency of the frequency converter is the same as the power supply frequency. The controller 1 compares the zero-crossing time detected by the zero-crossing detection module 8 of the frequency converter output with the zero-crossing time detected by the zero-crossing detection module 7 of the power supply to determine whether the phases of the two signals are the same. If the phases are the same, the controller 1 starts the variable-frequency to power-frequency switching program under the condition of switching enable. During the switching, the frequency converter control module 6 stops the operation of the frequency converter, and the contactor control module 5 controls the output contactor of the frequency converter to disconnect first, and then the power-frequency contactor is attracted, completing the switching from variable-frequency operation to power-frequency operation.

[0041] When switching from power-frequency operation to variable-frequency operation, the monitoring terminal issues a switching instruction through the communication connection established with the communication module 2 via the production network. After receiving the instruction, the controller 1 controls the contactor control module 5 to disconnect the power-frequency contactor first and then attract the variable-frequency contactor. Then the controller 1 controls the frequency converter control module 6 to start the operation of the frequency converter. The internal parameters of the frequency converter are set to start with speed tracking. The frequency converter realizes shock-free starting according to the motor speed and runs to the set frequency. If the operating parameters need to be changed, they can be remotely set through the network.

[0042] The display screen 9 is used for displaying the operating state and fault information.

[0043] As a further explanation of this utility model, refer to Figure 1 , the first end of the communication module 2 is connected to the controller 1, and the second end of the communication module 2 includes a first communication interface 21 and a second communication interface 22;

[0044] Both the first communication interface 21 and the second communication interface 22 are connected to the network conversion module.

[0045] Among them, the network conversion module is an RS485 to network module, and both the first communication interface 21 and the second communication interface 22 are RS485 communication interfaces.

[0046] As a further explanation of this utility model, the first end of the switching enable module 3 is connected to the controller 1, and the second end of the switching enable module 3 includes a first enable interface 31 and a second enable interface 32;

[0047] Both the first enable interface 31 and the second enable interface 32 are connected to the digital output interface of the frequency converter.

[0048] For a further explanation of the present utility model, refer to Figure 1 , the first end of the power supply module 4 is connected to the controller 1, and the second end of the power supply module 4 includes an L contact point 41 and an N contact point 42;

[0049] The L contact point 41 is connected to the live wire of the power supply circuit in the control cabinet, and the N contact point 42 is connected to the neutral wire of the power supply circuit in the control cabinet.

[0050] The controller 1 is installed in a control cabinet with two circuits of industrial frequency and variable frequency. When the two circuits operate separately, it is necessary to ensure that the rotation direction of the motor is the same, that is, the output power supply phase sequence is the same. The 220V L contact point 41 and 220V N contact point 42 of the power supply module 4 are connected to the power supply circuit in the control cabinet for supplying power to the controller 1.

[0051] For a further explanation of the present utility model, refer to Figure 1 , the first end of the contactor control module 5 is connected to the controller 1, and the second end of the contactor control module 5 includes a first contactor control contact point 51 and a second contactor control contact point 52;

[0052] The first contactor control contact point 51 and the second contactor control contact point 52 are respectively connected to the industrial frequency contactor and the variable frequency output contactor control circuits.

[0053] For a further explanation of the present utility model, refer to Figure 1 , the first end of the frequency converter control module 6 is connected to the controller 1, and the second end of the frequency converter control module 6 includes a first frequency converter control contact point 61 and a second frequency converter control contact point 62;

[0054] The first frequency converter control contact point 61 and the second frequency converter control contact point 62 are respectively connected to the frequency converter startup circuit.

[0055] For a further explanation of the present utility model, refer to Figure 1 , the first end of the power supply zero-crossing detection module 7 is connected to the controller 1, and the second end of the power supply zero-crossing detection module 7 includes a first power supply zero-crossing detection output contact point 71 and a second power supply zero-crossing detection output contact point 72;

[0056] The first power supply zero-crossing detection output contact point 71 is connected to a live wire of the power supply of the control cabinet, and the second power supply zero-crossing detection output contact point 72 is connected to a neutral wire of the power supply of the control cabinet.

[0057] Among them, the live wire of one phase connected by the power supply zero-crossing detection module 7 must ensure the same phase sequence as the live wire of one phase connected by the frequency converter output zero-crossing detection module 8.

[0058] For a further explanation of the present utility model, refer to Figure 1 , one end of the zero-crossing detection module 8 for the inverter output is connected to the controller 1, and the other end of the zero-crossing detection module 8 for the inverter output includes a first zero-crossing detection contact point 81 for the inverter output and a second zero-crossing detection contact point 82 for the inverter output;

[0059] The first zero-crossing detection contact point 81 for the inverter output is connected to one of the three-phase outputs of the inverter, and the second zero-crossing detection contact point 82 for the inverter output is connected to the power supply neutral line.

[0060] In the description of the present utility model, the terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0061] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0062] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, method, article or equipment / device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in these processes, methods, articles or equipment / device.

[0063] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A power frequency or variable frequency two-way automatic switching control device, characterized in that: It comprises a controller (1) and submodules connected to the controller (1), each submodule comprising a communication module (2), a switching enable module (3), a power module (4), a contactor control module (5), a frequency converter control module (6), a power supply zero-crossing detection module (7) and a frequency converter output zero-crossing detection module (8); The communication module (2) is connected to the network transfer module, and the network transfer module is connected to the production network; the switching enable module (3) is connected to the inverter digital output interface, and is used to receive the inverter frequency arrival signal; the power supply module (4) is connected to the power supply circuit in the control cabinet; the contactor control module (5) is connected to the control circuit of the power frequency contactor and the variable frequency output contactor, and is used to control the closing or opening of the power frequency contactor and the variable frequency output contactor; The inverter control module (6) is connected to the inverter starting circuit; two contacts of the power supply zero-crossing detection module (7) are respectively connected to a live wire and a neutral wire of a control cabinet power supply; one contact of the inverter output zero-crossing detection module (8) is connected to one of the three-phase outputs of the inverter, and another contact of the inverter output zero-crossing detection module (8) is connected to the neutral wire of the power supply.

2. A power frequency or variable frequency bidirectional automatic switching control device according to claim 1, characterized in that: The first end of the communication module (2) is connected to the controller (1), and the second end of the communication module (2) includes a first communication interface (21) and a second communication interface (22); The first communication interface (21) and the second communication interface (22) are both connected to the network transfer module.

3. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1 is characterized in that: A first end of the switching enabling module (3) is connected to the controller (1), and a second end of the switching enabling module (3) comprises a first enabling interface (31) and a second enabling interface (32); The first enabling interface (31) and the second enabling interface (32) are both connected to the digital output interface of the frequency converter.

4. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1 is characterized in that: The first end of the power module (4) is connected to the controller (1), and the second end of the power module (4) includes an L contact (41) and an N contact (42); The L contact (41) is connected to the live wire of the power circuit in the control cabinet, and the N contact (42) is connected to the neutral wire of the power circuit in the control cabinet.

5. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1 is characterized in that: A first end of the contactor control module (5) is connected to the controller (1), and a second end of the contactor control module (5) includes a first contactor control contact (51) and a second contactor control contact (52); The first contactor control contact (51) and the second contactor control contact (52) are respectively connected to the power frequency contactor and the variable frequency output contactor control circuit.

6. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1, characterized in that: The first end of the frequency converter control module (6) is connected to the controller (1), and the second end of the frequency converter control module (6) includes a first frequency converter control contact (61) and a second frequency converter control contact (62); The first frequency converter control contact (61) and the second frequency converter control contact (62) are respectively connected to the frequency converter starting circuit.

7. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1 is characterized in that: The first end of the power supply zero-crossing detection module (7) is connected to the controller (1), and the second end of the power supply zero-crossing detection module (7) comprises a first power supply zero-crossing detection output contact (71) and a second power supply zero-crossing detection output contact (72); The first power supply zero-crossing detection output contact (71) is connected to a live line of a control cabinet power supply, and the second power supply zero-crossing detection output contact (72) is connected to a neutral line of a control cabinet power supply.

8. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1, characterized in that: The first end of the frequency converter output zero-crossing detection module (8) is connected to the controller (1), and the second end of the frequency converter output zero-crossing detection module (8) comprises a first frequency converter output zero-crossing detection contact (81) and a second frequency converter output zero-crossing detection contact (82); The first frequency converter output zero-crossing detection contact (81) is connected to one of the three-phase outputs of the frequency converter, and the second frequency converter output zero-crossing detection contact (82) is connected to the power supply zero line.

9. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 1, characterized in that: It also comprises a display screen (9), which is connected to the controller (1), and is used to display operating status and fault information.

10. The industrial frequency or variable frequency bidirectional automatic switching control device according to claim 2, characterized in that: The network conversion module is an RS485 network conversion module, and the first communication interface (21) and the second communication interface (22) are both RS485 communication interfaces.

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