CN216959679U - Driving integrated control device of oil pumping unit - Google Patents
Driving integrated control device of oil pumping unit Download PDFInfo
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- CN216959679U CN216959679U CN202220519025.2U CN202220519025U CN216959679U CN 216959679 U CN216959679 U CN 216959679U CN 202220519025 U CN202220519025 U CN 202220519025U CN 216959679 U CN216959679 U CN 216959679U
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Abstract
The application discloses a pumping unit driving integrated control device, which comprises a current conversion circuit connected with an external power supply; the sampling end of the sampling circuit is connected with the current conversion circuit and is used for sampling the voltage converted by the current conversion circuit and outputting the sampled reference voltage through the output end; the control circuit is connected with the output end of the sampling circuit and the current conversion circuit and is used for controlling the current conversion circuit to convert the direct current flowing through the current conversion circuit into alternating current and feed the alternating current back to an external power supply when the reference voltage is greater than the voltage regulation threshold value; the control circuit is used for controlling the current conversion circuit to convert alternating current input by an external power supply into direct current when the reference voltage is less than or equal to a voltage regulation threshold value, outputting the direct current to the inverter circuit, controlling the inverter circuit to invert the direct current to obtain a target electric signal, outputting the target electric signal to the external load, and realizing integrated control of the pumping unit.
Description
Technical Field
The application relates to the technical field of automation, in particular to a driving integrated control device of an oil pumping unit.
Background
The pumping unit is a device for exploiting petroleum, the main driving device of the pumping unit is a motor, a frequency converter is mostly adopted for the existing driving control of the motor, and in order to better monitor the state of an oil well, sensors such as pressure, temperature, load displacement and the like are also arranged on the oil well besides a power part, and a remote terminal controller, a wireless communication device and the like are arranged, so that the state of the oil well is fed back to a remote oil well control center. However, in the prior art, the several parts are independent of each other, and are connected by wires at the time of installation to communicate with each other. From this, can learn, have among the current drive control scheme to the beam-pumping unit with high costs, the integrated level is low, volume and weight big scheduling problem, need more wiring simultaneously between the different mutually independent module can accomplish the installation, and is higher to installer's technical requirement, and required installation man-hour is also longer, so need a scheme that can solve above-mentioned technical problem.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application mainly solved provides an integrated controlling means of beam-pumping unit drive, can realize integrating the control to the beam-pumping unit to reduce the installation requirement.
In order to solve the technical problem, the application adopts a technical scheme that: the utility model provides a beam-pumping unit drive integrated control device, includes:
the current conversion circuit is connected with an external power supply;
the sampling end of the sampling circuit is connected with the current conversion circuit and is used for sampling the voltage converted by the current conversion circuit and outputting the sampled reference voltage through the output end;
the control circuit is connected with the output end of the sampling circuit and the current conversion circuit and is used for controlling the current conversion circuit to convert the direct current flowing through the current conversion circuit into alternating current and feed the alternating current back to the external power supply when the reference voltage is greater than a voltage regulation threshold value;
the control circuit is further used for controlling the current conversion circuit to convert alternating current input by an external power supply into direct current and output the direct current to the inverter circuit when the reference voltage is smaller than or equal to the voltage regulation threshold value, and controlling the inverter circuit to perform inversion processing on the direct current to obtain a target electric signal and output the target electric signal to the external load.
Further, the voltage regulation threshold includes a first threshold, and the current conversion circuit includes:
the input end of the rectifying circuit is connected with the external power supply, and the output end of the rectifying circuit is connected with the inverter circuit so as to rectify the alternating current input by the external power supply and output the alternating current to the inverter circuit;
the input end of the energy feedback circuit is connected with the inverter circuit, the output end of the energy feedback circuit is connected with the external power supply, the control end of the energy feedback circuit is connected with the control circuit, and the energy feedback circuit is used for converting direct current input by a bus into alternating current under the control of the control circuit and feeding the alternating current back to the external power supply when the reference voltage is greater than the first threshold value.
Further, the energy feedback circuit includes a dc-to-ac circuit and a first reactor, an input end of the dc-to-ac circuit is connected to the inverter circuit, an output end of the dc-to-ac circuit is connected to one end of the first reactor, another end of the first reactor is connected to the external power supply, a control end of the dc-to-ac circuit is connected to the control circuit, and the dc-to-ac circuit is configured to convert dc power input by the bus into ac power under the control of the control circuit when the reference voltage is greater than the first threshold value, and feed the ac power back to the external power supply.
Still further, the direct current-to-alternating current circuit includes three sets of first switch bridge arms connected in parallel, each first switch bridge arm includes two first switches connected in series, and a control end of each first switch is connected to the control circuit.
Further, the voltage regulation threshold comprises a second threshold;
the current conversion circuit comprises a bidirectional current conversion circuit and a second reactor, one end of the second reactor is connected with the external power supply, the other end of the second reactor is connected with the first end of the bidirectional current conversion circuit, the second end of the bidirectional current conversion circuit is connected with the filter circuit, and the control end of the bidirectional current conversion circuit is connected with the control circuit;
when the reference voltage is less than or equal to the second threshold value, the control circuit controls the bidirectional current conversion circuit to rectify the alternating current input from the first end to obtain direct current and output the direct current to the filter circuit;
and when the reference voltage is greater than a second threshold value, the control circuit controls the bidirectional current conversion circuit to convert the direct current input from the second end into alternating current and feed the alternating current back to the external power supply through the second reactor.
Furthermore, the bidirectional current conversion circuit comprises three groups of second switch bridge arms arranged in parallel, each second switch bridge arm comprises two second switches connected in series, and a control end of each second switch is connected with the control circuit.
Furthermore, the device also comprises a filter circuit, wherein the filter circuit is connected with the current conversion circuit and the inverter circuit and is used for filtering the current flowing through the filter circuit.
Still further, the filter circuit includes a filter capacitor;
the device also comprises a buffer circuit, wherein the buffer circuit is connected with the current conversion circuit and the filter capacitor, and the control end of the buffer circuit is connected with the control circuit so as to protect the filter capacitor under the control of the control circuit.
Still further, buffer circuit includes parallelly connected buffer switch and the buffer resistance who sets up, buffer resistance connects current converting circuit with filter capacitor, buffer switch's control end connects control circuit, control circuit is used for when filter capacitor's voltage is less than the third threshold value, control buffer switch opens, when filter capacitor's voltage is greater than or equal to the third threshold value, control buffer switch is closed.
Furthermore, the device also comprises at least one auxiliary power supply circuit, wherein one end of the auxiliary power supply circuit is connected with the output end of the current conversion circuit, and the other end of the auxiliary power supply circuit is connected with at least one external load so as to convert the direct current output by the filter capacitor into the direct current conforming to the rated voltage of the external load.
The beneficial effect of this application is: being different from the situation of the prior art, the integrated control device for pumping unit drive provided by the application is used for controlling at least one load in a pumping unit, and comprises: the sampling circuit is connected with the sampling end of the sampling circuit and used for sampling the voltage converted by the current conversion circuit and outputting the sampled reference voltage through the output end; the control circuit is connected with the output ends of the current conversion circuit and the sampling circuit, the inverter circuit is connected with the current conversion circuit and an external load, and the control end of the inverter circuit is connected with the control circuit. Specifically, in the technical scheme provided by the application, the control circuit is used for controlling the current conversion circuit to convert the direct current flowing through the current conversion circuit into the alternating current and feed the alternating current back to the external power supply when the reference voltage is greater than the voltage regulation threshold; the control circuit is also used for controlling the current conversion circuit to convert alternating current input by an external power supply into direct current when the reference voltage is less than or equal to the voltage regulation threshold value, outputting the direct current to the inverter circuit, controlling the inverter circuit to invert the direct current to obtain a target electric signal, and outputting the target electric signal to an external load, so that the inverter circuit for inverting the direct current and the current conversion circuit for energy feedback are integrated into one device, and the control circuit is used for controlling, and the integrated control of the load in the pumping unit is realized while electric energy additionally generated in the process of controlling the load is recycled and fed back to the external power supply, so that a good technical effect is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an integrated pumping unit drive control device according to the present application;
fig. 2 is a schematic structural diagram of another embodiment of the pumping unit driving integrated control device according to the present application;
fig. 3 is a schematic structural diagram of another embodiment of the pumping unit driving integrated control device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an integrated pumping unit driving control device 100 according to the present invention. It should be noted that, the pumping unit driving integrated control device 100 provided in the present application is used for controlling at least one load in a pumping unit, and the number of the loads controlled by the pumping unit driving integrated control device 100 is not limited herein, and is specifically subject to actual setting. In the present embodiment, the load in the pumping unit at least includes a motor, and the pumping unit driving integrated control device 100 provided by the present application includes: the current conversion circuit 10, the sampling circuit 20, the control circuit 30 and the inverter circuit 40, and the functions of the respective circuit modules are explained in detail in the corresponding parts below.
The current conversion circuit 10 is connected to the external power supply 1. The current conversion circuit 10 is configured to convert ac power input by the external power supply 1 into dc power under the control of the control circuit 30, or convert dc power flowing into the current conversion circuit 10 when a bus voltage in the pumping unit driving integrated control device 100 exceeds a set voltage regulation threshold, so as to obtain ac power and feed the ac power back to the external power supply 1, thereby implementing electric energy feedback. Wherein, the parameters of the direct current converted by the current conversion circuit 10 are determined according to the parameters of the current conversion circuit 10; similarly, the parameters of the alternating current converted by the current converting circuit 10 are determined according to the parameters of the current converting circuit 10 and the external power source 1, and the process of the control circuit 30 controlling the current converting circuit 10, which is not limited herein. The voltage regulation threshold is a preset empirical value, and can be adjusted according to the specific structure of the current conversion circuit 10 and the actual requirement, and the parameters of the external power supply 1 at least include the phase sequence of the alternating current.
Specifically, referring to fig. 2, in an embodiment, the current converting circuit 10 may include a rectifying circuit 11 and an energy feedback circuit 12, and the voltage regulation threshold includes a first threshold. The rectifying circuit 11 is configured to rectify an ac power input by the external power supply 1 to obtain a dc power, and the energy feedback circuit 12 is configured to convert the dc power input to the current converting circuit 10 to obtain an ac power having the same phase sequence as the ac power flowing through the external power supply, and feed the ac power back to the external power supply 1 to achieve energy recovery. It should be noted that the duty cycles of the rectifying circuit 11 and the energy feedback circuit 12 are controlled by the control circuit 30 according to actual requirements.
In another embodiment, referring to fig. 3, the current converting circuit 10 may include a bidirectional current converting circuit 14, and the voltage regulation threshold includes a second threshold. The bidirectional current converting circuit 14 may be configured to rectify the alternating current input from the external power supply 1 under the control of the control circuit 30 when the reference voltage is less than or equal to the second threshold, and may be further configured to convert the direct current input to the current converting circuit 10 under the control of the control circuit 30 when the reference voltage is greater than the second threshold to obtain the alternating current. Specifically, under the control of the control circuit 30, when the reference voltage is less than or equal to the second threshold, the bidirectional current conversion circuit 14 rectifies the alternating current input by the external power supply 1 to obtain direct current, and outputs the direct current to the inverter circuit 40; when the reference voltage is greater than the second threshold value, the direct current input from the inverter circuit 40 to the current conversion circuit 10 is converted to obtain an alternating current, and the alternating current is output to the external power supply 1.
The sampling end of the sampling circuit 20 is connected to the current converting circuit 10, and is configured to sample the voltage converted by the current converting circuit 10, and output the sampled reference voltage through the output end. Specifically, the output end of the sampling circuit 20 is connected to the control circuit 30, and is configured to output the sampled reference voltage to the control circuit 30, so that the control circuit 30 controls the current converting circuit 10 according to the sampled reference voltage. In addition, the sampling circuit 20 is further configured to sample the alternating current flowing in the external power supply 1, so as to obtain a parameter of the external power supply, wherein the sampling circuit 20 at least obtains a phase sequence of the alternating current in the external power supply 1 by sampling, and outputs the phase sequence of the alternating current in the external power supply 1 obtained by sampling to the control circuit 30, so that the control circuit 30 can control the current converting circuit 10 to perform energy feedback. Further, in other embodiments, the type of the sampling circuit 20 is not limited, and the sampling circuit 20 may be a device for sampling any one or more of current, voltage, and temperature.
Further, when the current converting circuit 10 includes the rectifying circuit 11 and the energy feedback circuit 12, the sampling terminal of the sampling circuit 20 is connected to the output terminal of the rectifying circuit 11. The output end of the rectifying circuit 11 is connected to the inverter circuit 40.
Further, when the current conversion circuit 10 includes the bidirectional current conversion circuit 14, the sampling circuit 20 is connected to the dc output terminal of the bidirectional current conversion circuit 14. The dc output end of the bidirectional current converting circuit 14 is the end connected to the inverter circuit 40, that is, the sampling end of the sampling circuit 20 in the present embodiment is connected between the bidirectional current converting circuit 14 and the inverter circuit 40, so as to sample the voltage at the dc output end of the current converting circuit 10.
Further, in some embodiments, AB and CD in fig. 2 are defined as dc buses of the pumping unit driving integrated control device 100, and correspondingly, the sampling circuit 20 samples voltages of the dc buses. That is, the circuit structure included in the pumping unit driving integrated control device 100 must be set in the operation process of the pumping unit driving integrated control device 100, so as to ensure that the voltage of the bus is not higher than the voltage safety threshold that can be borne, and therefore, when the voltage of the sampled dc bus (i.e., the reference voltage) is greater than the voltage regulation threshold, the control circuit 30 controls the current conversion circuit 10 to recover energy and feed back the energy to the external power supply 1, so that the voltage of the dc bus is lower than the voltage regulation threshold. The voltage regulation threshold corresponds to a voltage safety threshold of a dc bus in the pumping unit driving integrated control device 100, and the voltage safety threshold of the dc bus is determined according to the material of the dc bus and the rated voltage of the circuit structure connected to the dc bus.
The control circuit 30 is connected to the output end of the sampling circuit 20 and the current converting circuit 10, and is configured to control the current converting circuit 10 to convert the dc current flowing through the current converting circuit 10 into ac current and feed the ac current back to the external power supply 1 when the reference voltage is greater than the voltage regulation threshold. The voltage regulation threshold is an empirical value preset in the current embodiment, and may also be used to indicate a safety threshold of a dc bus voltage in the pumping unit driving integrated control device 100 when a motor in the pumping unit operates stably, and is specifically set according to actual circuit parameters, which is not limited herein.
Further, the control circuit 30 includes a control chip. The control chip at least includes a DSP chip, and it is understood that in other embodiments, the control chip may also include other types of chips. Further, the control circuit 30 is also used to control communication with an external terminal device; the device is also used for acquiring direct current analog quantity input or output; and the controller is also used for acquiring an input signal reflecting whether the state of the switching value is on or off, and controlling the output to control the switching value of a relay or a high-power tube and the like.
The inverter circuit 40 is connected to the current conversion circuit 10 and the external load 2, a control end of the inverter circuit 40 is connected to the control circuit 30, and the control circuit 30 is further configured to control the current conversion circuit 10 to convert the alternating current input by the external power supply 1 into a direct current when the reference voltage is less than or equal to the voltage regulation threshold value, output the direct current to the inverter circuit 40, control the inverter circuit 40 to perform inversion processing on the direct current to obtain a target electrical signal, and output the target electrical signal to the external load 2, thereby driving the external load 2. The external load 2 is a load controlled by the pumping unit driving integrated control device 100, and includes at least a motor in the pumping unit. The target electrical signal is an electrical signal which is output to a load in the pumping unit and meets the rated power supply requirement of the load, and the voltage and the current of the target electrical signal are set according to the actual driving requirement of the load, which is not limited herein.
In the embodiment corresponding to fig. 1 of the present application, by providing the pumping unit driving integrated control device 100 including the current conversion circuit 10, the sampling circuit 20, the control circuit 30, and the inverter circuit 40, integrated control of at least one load in the pumping unit is realized, and simplification of a circuit structure for controlling the pumping unit is realized. Compared with the prior art, the connection relation among the circuit modules needs to be established independently, in the technical scheme provided by the application, the current conversion circuit 10, the sampling circuit 20, the control circuit 30 and the inverter circuit 40 are integrated into one device, so that when an installer installs the pumping unit driving integrated control device 100 for controlling the pumping unit, because the current conversion circuit 10, the sampling circuit 20, the control circuit 30 and the inverter circuit 40 are integrated into one device in advance, only the connection relation between the pumping unit driving integrated control and the pumping unit load and between the pumping unit driving integrated control and the external power supply 1 needs to be established, the connection relation among the circuit modules in the pumping unit driving integrated control device 100 does not need to be established again, and the installation difficulty of installing the pumping unit driving integrated control device 100 is further reduced. In addition, according to the technical scheme provided by the application, the control circuit 30, the sampling circuit 20 and the current conversion circuit 10 are matched with each other, so that redundant direct current generated in the process of controlling the load can be recycled and fed back to the external power supply 1, a consumption resistor structure is omitted, the circuit structure in the pumping unit driving integrated control device 100 is further simplified, and the investment of hardware cost is reduced to a certain extent.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of the pumping unit driving integrated control device 100 according to the present invention.
In the present embodiment, the current conversion circuit 10 includes a rectifier circuit 11 and an energy feedback circuit 12.
The input end of the rectifying circuit 11 is connected to the external power supply 1, and the output end of the rectifying circuit 11 is connected to the inverter circuit 40, so as to rectify the alternating current input by the external power supply 1 to obtain direct current, and output the obtained direct current to the inverter circuit 40.
Further, with reference to fig. 2, the rectifier circuit 11 includes three sets of third switch legs 111, 112 and 113 that are arranged in parallel, each third switch leg includes two third switches connected in series (all of D1 to D6 shown in fig. 2 are third switches), a control end of each third switch is connected to the control circuit 30, and under the control of the control circuit 30, the third switches are used to convert the flowing alternating current, so as to obtain a direct current and output the direct current to the inverter circuit 40.
Wherein the third switches (including D1-D6 illustrated in fig. 2) comprise diodes. Specifically, the parameters of the diode are not limited herein, and are specifically set according to actual requirements. In addition, the type of the third switch is not limited herein, and in other embodiments, the third switch may also be other types of switching devices, which are not listed here.
The input end of the energy feedback circuit 12 is connected to the inverter circuit 40, the output end of the energy feedback circuit 12 is connected to the external power supply 1, and the control end of the energy feedback circuit 12 is connected to the control circuit 30, so that the direct current input by the bus is converted into alternating current under the control of the control circuit 30 and fed back to the external power supply 1. Specifically, when the control circuit 30 determines that the sampled reference voltage is greater than the voltage regulation threshold, the control circuit 30 controls the energy feedback circuit 12 to start at this time, and then converts the direct current output by the inverter circuit 40 and input to the energy feedback circuit 12 through the direct current bus into an alternating current, and outputs the alternating current to the external power supply terminal. Compared with the prior art that the direct current is consumed by the brake resistor, the energy feedback circuit 12 is used for converting the direct current into the alternating current and outputting the alternating current to the external power supply 1, and therefore effective recovery of energy is well achieved.
Further, with reference to fig. 2, the energy feedback circuit 12 includes a dc-to-ac circuit 121 and a first reactor 122. The input end of the dc-to-ac circuit 121 is connected to the inverter circuit 40, the output end of the dc-to-ac circuit 121 is connected to one end of the first reactor 122, the other end of the first reactor 122 is connected to the external power supply 1, and the control end of the dc-to-ac circuit 121 is connected to the control circuit 30, so that the dc power input from the dc bus is converted into ac power under the control of the control circuit 30 and fed back to the external power supply 1.
Further, with continued reference to fig. 2, dc-to-ac circuit 121 includes three sets of first switching leg 1211, first switching leg 1212, and first switching leg 1213, which are arranged in parallel, where each first switching leg (here, the first switching leg includes first switching leg 1211, first switching leg 1212, and first switching leg 1213 illustrated in fig. 2) includes two first switches connected in series, and a control terminal of each first switch is connected to control circuit 30. T1 to T6 shown in fig. 2 are all the first switches. Under the control of the control circuit 30, the first switch is used to convert the flowing dc power, so as to obtain an ac power and output the ac power to the first reactor 122, so as to output the ac power to the external power supply 1 through the first reactor 122.
Wherein, the first switch comprises an IGBT switch tube. Specifically, the parameters of the IGBT switch tube are not limited herein, and are specifically set according to actual requirements. In addition, the type of the first switch is not limited herein, and in other embodiments, the first switch may also be another type of switching device, which is not listed here.
Further, with continued reference to fig. 2, the first reactor 122 includes three resistors R2, R3, and R4. Each resistor is connected to a first switch leg, specifically, resistor R2 is connected to first switch leg 1211, resistor R3 is connected to first switch leg 1212, and resistor R4 is connected to first switch leg 1213. And each resistor is connected with the joint of two IGBT switching tubes in the first switching bridge arm. Here, the parameters of the resistor included in the first reactor 122 are not limited, and are specifically set according to actual requirements. Further, in other embodiments, the first reactor 122 may also be in other types of circuit structures, for example, the first reactor 122 may be an LC or LCL filter reactor, and may be specifically configured according to actual requirements, which is not limited herein.
Further, with reference to fig. 2, the inverter circuit 40 includes four sets of fourth switch legs 41, 42 and 43 arranged in parallel, each fourth switch leg includes two serially connected fourth switches (all of the switches T7 to T12 shown in fig. 2 are fourth switches), and a control end of each fourth switch is connected to the control circuit 30. The fourth switch comprises an IGBT switch tube, and parameters of the IGBT switch tube are specifically set according to actual requirements.
Specifically, in the embodiment illustrated in fig. 2, for oilfield applications, an oil pumping unit driving integrated control device 100 including a rectification circuit 11, an energy feedback circuit 12, an inverter circuit 40, a sampling circuit 20, and a control circuit 30 is provided, and by integrating the above circuit modules in one device in advance, the whole system for controlling the oil pumping unit is simplified. Meanwhile, the inverter circuit 40 and the energy feedback circuit 12 are controlled by the same control circuit 30, the structure of the whole machine is further simplified, the cost is reduced, the volume and the weight are reduced, meanwhile, the connection relation among all circuit modules is established in advance, only the input line and the output line for connecting the external power supply 1 and the external load 2 are reserved, the installation working time is greatly shortened, and the labor cost is reduced.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the pumping unit driving integrated control device 100 according to the present application.
In the present embodiment, the current conversion circuit 10 includes the bidirectional current conversion circuit 14 and the second reactor 13, and the voltage regulation threshold includes the second threshold. One end of the second reactor 13 is connected to the external power supply 1, the other end of the second reactor 13 is connected to a first end of the bidirectional current conversion circuit 14, a second end of the bidirectional current conversion circuit 14 is connected to the filter circuit 50, and a control end of the bidirectional current conversion circuit 14 is connected to the control circuit 30. The first end of the bidirectional current converting circuit 14 is the end close to the external power supply 1, and the second end of the bidirectional current converting circuit 14 is the end far from the external power supply 1.
When the reference voltage sampled by the sampling circuit 20 is less than or equal to the second threshold, the control circuit 30 controls the bidirectional current converting circuit 14 to rectify the alternating current input from the first end to obtain a direct current, and outputs the direct current to the inverter circuit 40. Further, when the pumping unit driving integrated control device 100 includes the filter circuit 50, the bidirectional current conversion circuit 14 converts the direct current to obtain a direct current, and outputs the direct current to the inverter circuit 40 after the direct current is filtered by the filter circuit 50.
When the reference voltage is greater than the second threshold value, the control circuit 30 controls the bidirectional current conversion circuit 14 to convert the direct current input from the second end into an alternating current, output the alternating current from the first end, and then feed back the alternating current to the external power supply 1 through the second reactor 13, thereby realizing energy recovery. The second threshold is an empirical value preset in the present embodiment, and may also be used to represent an empirical value of the bidirectional current conversion circuit 14 for converting the operating mode, specifically, when the reference voltage is greater than the second threshold, the bidirectional current conversion circuit 14 executes an operating mode for converting the direct current input by the second terminal into the alternating current; when the reference voltage is less than or equal to the second threshold, the bidirectional current converting circuit 14 executes a working mode of converting the ac power input by the first terminal into the dc power, and the second threshold may be specifically set according to actual circuit parameters, which is not limited herein. It should be noted that the second threshold is different from the voltage regulation threshold. It should be noted that, in the process of executing the operation of the pumping unit driving integrated control device, the bidirectional current converting circuit 14 is always in operation, and the control circuit 30 controls the switching of the operation mode of the bidirectional current converting circuit 14 according to the magnitude relationship between the reference voltage and the second threshold, so the switching period of the operation mode of the bidirectional current converting circuit 14 is not limited herein.
Further, bidirectional current conversion circuit 14 includes three sets of second switching leg 141, second switching leg 142, and second switching leg 143 arranged in parallel. Wherein each second switch leg comprises two second switches connected in series, as illustrated in fig. 3, second switch leg 141 comprises second switch T13 and second switch T14, second switch leg 142 comprises second switch T15 and second switch T16, second switch leg 143 comprises second switch T17 and second switch T18, and a control terminal of each second switch (including T13 to T18 illustrated in fig. 3) is connected to control circuit 30. The second switch includes an IGBT switching tube, and the IGBT switching parameters included in the bidirectional current conversion circuit 14 are not limited herein, and are specifically set according to actual requirements.
Specifically, when the reference voltage sampled by the sampling circuit 20 is less than or equal to the second threshold, the control circuit 30 controls each second switch included in the bidirectional current conversion circuit 14 to rectify the alternating current input from the first end of the bidirectional current conversion circuit 14 to obtain a direct current, and outputs the direct current to the inverter circuit 40. When the reference voltage is greater than the second threshold value, the control circuit 30 controls each second switch included in the bidirectional current conversion circuit 14 to convert the direct current input from the second end of the bidirectional current conversion circuit 14 into alternating current, and output the alternating current from the first end, and then feedback the alternating current to the external power supply 1 through the second reactor 13, thereby realizing energy recovery.
In the present embodiment, by providing the pumping unit driving integrated control device 100 including the bidirectional current conversion circuit 14, and integrating the two functions of rectifying the alternating current to obtain the direct current and converting the direct current to obtain the alternating current into the bidirectional current conversion circuit 14, the circuit structure is further simplified, and the volume of the pumping unit driving integrated control device 100 is reduced.
Further, with continued reference to fig. 3, the second reactor 13 includes three resistors R5, R6, and R7. Each resistor is connected with a second switch bridge arm. Specifically, resistor R5 is connected to second switch leg 141, resistor R6 is connected to second switch leg 142, and resistor R7 is connected to second switch leg 143. Specifically, each resistor is connected with the junction of two IGBT switching tubes in the second switching bridge arm. Here, the parameters of the resistor included in the second reactor 13 are not limited, and are specifically set according to actual requirements. Further, in other embodiments, the second reactor 13 may also be in other types of circuit structures, for example, the second reactor 13 may be an LC or LCL filter reactor, and may be specifically configured according to actual requirements, which is not limited herein.
Referring to fig. 2 to fig. 3, the pumping unit driving integrated control device 100 further includes a filter circuit 50 and a buffer circuit 60, wherein the filter circuit 50 is used for filtering a current flowing through the filter circuit, and the buffer circuit 60 is used for buffering and protecting the filter circuit 50, so as to prevent the device from being damaged due to an excessively fast voltage rise at two ends of the filter circuit 50. Specifically, the filter circuit 50 is connected to the current conversion circuit 10 and the inverter circuit 40 for performing filtering processing on a current flowing therethrough, the buffer circuit 60 is connected to the current conversion circuit 10 and the filter circuit 50, and a control terminal of the buffer circuit 60 is connected to the control circuit 30 for protecting the filter circuit 50 under the control of the control circuit 30. It should be noted that although fig. 2 and 3 show that the buffer circuit 60 is disposed on the bus, in other embodiments, the buffer circuit 60 may be disposed on the branch of the filter circuit 50.
Further, the filter circuit 50 includes a filter capacitor C1. Specifically, the buffer circuit 60 is connected to the current conversion circuit 10 and the filter capacitor C1, and a control terminal of the buffer circuit 60 is connected to the control circuit 30 to protect the filter capacitor C1 under the control of the control circuit 30.
Furthermore, the buffer circuit 60 includes a buffer switch KM1 and a buffer resistor R1, which are arranged in parallel, the buffer resistor R1 is connected to the current conversion circuit 10 and the filter capacitor, the buffer switch KM1 is connected to the current conversion circuit 10 and the filter capacitor C1, and a control terminal of the buffer switch KM1 is connected to the control circuit 30. Specifically, the control circuit 30 is configured to control the buffer switch KM1 to be opened when the voltage of the filter capacitor C1 is less than a third threshold, and control the buffer switch KM1 to be closed to short the buffer resistor R1 when the voltage of the filter capacitor C1 is greater than or equal to the third threshold. As described above, the buffer circuit 60 may be disposed in the branch of the filter circuit 50, and correspondingly, when the buffer circuit 60 is disposed in the branch of the filter circuit 50, the buffer switch KM1 and the buffer resistor R1 are disposed in the branch of the filter capacitor C1, that is, the buffer switch KM1 and the buffer resistor R1 are directly connected in series with the filter capacitor C1.
Wherein, in the present embodiment, the third threshold is the rated voltage of the filter capacitor C1. It is understood that in other embodiments, the third threshold may also be set to be less than the rated voltage of the filter capacitor C1 for better protection of the filter capacitor C1.
Referring to fig. 2 to 3, the apparatus provided in the present application further includes at least one auxiliary power circuit 70.
In one embodiment, when the pumping unit driving integrated control device 100 includes the filter circuit 50, one end of each auxiliary power circuit 70 is connected to the output end of the current converting circuit 10, and the other end of the auxiliary power circuit 70 is connected to at least one external load, so as to convert the dc power outputted after the filtering process of the filter circuit 50 into dc power conforming to the rated voltage of the external load.
In another embodiment, when the filter circuit 50 includes the filter capacitor C1, one end of the auxiliary power circuit 70 is connected to the output terminal of the current converting circuit 10, and the other end of the auxiliary power circuit 70 is connected to at least one external load, so as to convert the dc power filtered by the filter capacitor C1 into dc power conforming to the rated voltage of the external load. The auxiliary power circuit 70 is used to supply power to some modules that need to be driven by dc power, such as circuit modules and lighting lamps, which are not specifically listed.
The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. An integrated pumping unit drive control apparatus for controlling at least one load in a pumping unit, comprising:
the current conversion circuit is connected with an external power supply;
the sampling end of the sampling circuit is connected with the current conversion circuit and is used for sampling the voltage converted by the current conversion circuit and outputting the sampled reference voltage through the output end;
the control circuit is connected with the output end of the sampling circuit and the current conversion circuit and is used for controlling the current conversion circuit to convert the direct current flowing through the current conversion circuit into alternating current and feed the alternating current back to the external power supply when the reference voltage is greater than a voltage regulation threshold value;
the control circuit is also used for controlling the current conversion circuit to convert alternating current input by an external power supply into direct current when the reference voltage is less than or equal to the voltage regulation threshold value, outputting the direct current to the inverter circuit, and controlling the inverter circuit to invert the direct current to obtain a target electric signal and outputting the target electric signal to the external load.
2. The apparatus of claim 1, wherein the voltage regulation threshold comprises a first threshold, and wherein the current conversion circuit comprises:
the input end of the rectifying circuit is connected with the external power supply, and the output end of the rectifying circuit is connected with the inverter circuit so as to rectify the alternating current input by the external power supply and output the alternating current to the inverter circuit;
the input end of the energy feedback circuit is connected with the inverter circuit, the output end of the energy feedback circuit is connected with the external power supply, the control end of the energy feedback circuit is connected with the control circuit, and the energy feedback circuit is used for converting direct current input by a bus into alternating current under the control of the control circuit and feeding the alternating current back to the external power supply when the reference voltage is greater than the first threshold value.
3. The apparatus according to claim 2, wherein the energy feedback circuit includes a dc-to-ac circuit and a first reactor, an input terminal of the dc-to-ac circuit is connected to the inverter circuit, an output terminal of the dc-to-ac circuit is connected to one end of the first reactor, another end of the first reactor is connected to the external power supply, a control terminal of the dc-to-ac circuit is connected to the control circuit, and the dc-to-ac circuit is configured to convert dc power input from the bus into ac power under the control of the control circuit and feed back the ac power to the external power supply when the reference voltage is greater than the first threshold.
4. The apparatus of claim 3,
the direct current-to-alternating current circuit comprises three groups of first switch bridge arms which are arranged in parallel, each first switch bridge arm comprises two first switches which are connected in series, and the control end of each first switch is connected with the control circuit.
5. The apparatus of claim 1, wherein the voltage regulation threshold comprises a second threshold;
the current conversion circuit comprises a bidirectional current conversion circuit and a second reactor, one end of the second reactor is connected with the external power supply, the other end of the second reactor is connected with the first end of the bidirectional current conversion circuit, the second end of the bidirectional current conversion circuit is connected with a filter circuit, and the control end of the bidirectional current conversion circuit is connected with the control circuit;
when the reference voltage is less than or equal to the second threshold value, the control circuit controls the bidirectional current conversion circuit to rectify the alternating current input from the first end to obtain direct current and output the direct current to the filter circuit;
and when the reference voltage is greater than the second threshold value, the control circuit controls the bidirectional current conversion circuit to convert the direct current input from the second end into alternating current and feed the alternating current back to the external power supply through the second reactor.
6. The apparatus of claim 5, wherein the bidirectional current conversion circuit comprises three sets of second switching legs arranged in parallel, each of the second switching legs comprises two second switches connected in series, and a control terminal of each of the second switches is connected to the control circuit.
7. The apparatus of claim 1, further comprising a filter circuit connected to the current converting circuit and the inverter circuit for filtering the current flowing therethrough.
8. The apparatus of claim 7, wherein the filter circuit comprises a filter capacitor;
the device also comprises a buffer circuit, wherein the buffer circuit is connected with the current conversion circuit and the filter capacitor, and the control end of the buffer circuit is connected with the control circuit so as to protect the filter capacitor under the control of the control circuit.
9. The apparatus of claim 8, wherein the snubber circuit comprises a snubber switch and a snubber resistor arranged in parallel, the snubber resistor connects the current converting circuit and the filter capacitor, the snubber switch connects the current converting circuit and the filter capacitor, a control terminal of the snubber switch is connected to the control circuit, and the control circuit is configured to control the snubber switch to be turned off when the voltage of the filter capacitor is smaller than a third threshold value and to be turned on when the voltage of the filter capacitor is greater than or equal to the third threshold value.
10. The apparatus of claim 1, further comprising at least one auxiliary power circuit, wherein one end of the auxiliary power circuit is connected to the output terminal of the current converting circuit, and the other end of the auxiliary power circuit is connected to at least one external load, so as to convert the dc power outputted from the filter capacitor into dc power conforming to the rated voltage of the external load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220519025.2U CN216959679U (en) | 2022-03-10 | 2022-03-10 | Driving integrated control device of oil pumping unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220519025.2U CN216959679U (en) | 2022-03-10 | 2022-03-10 | Driving integrated control device of oil pumping unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114592833A (en) * | 2022-03-10 | 2022-06-07 | 苏州安驰控制***有限公司 | Integrated control device of oil pumping unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114592833A (en) * | 2022-03-10 | 2022-06-07 | 苏州安驰控制***有限公司 | Integrated control device of oil pumping unit |
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