A variable frequency power supply device with dual-circuit power balance

Abstract

The present application discloses a variable frequency power supply device with dual-circuit electric energy balance, which includes a rectifier unit, two inverter units, two DC circuits, two voltage collection units, an energy transmission unit, and an energy balance control unit. The input end of the rectifier unit is connected to the AC power grid; the output ends of the two inverter units are used to be connected to two loads respectively; the two ends of the two DC circuits are respectively connected to the output end of the rectifier circuit and the input end of the two inverter units; the two voltage collection units are respectively connected to the two DC circuits; the two ends of the energy transmission unit are respectively connected to the two DC circuits; and the energy balance control unit is connected to the two voltage collection units, the energy transmission unit, and the two inverter units. The variable frequency power supply device with dual-circuit electric energy balance makes the voltages of the two DC circuits tend to a balanced voltage, thereby achieving a complementary state of electric energy for the two loads, reducing power consumption, and preventing power accumulation and impact on the AC power grid.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy regulating devices, and in particular to a variable frequency power supply device with dual-circuit electric energy balance. Background Art

[0002] During the oil extraction process, the pumpjack generates sufficient suction force or pressure through reciprocating or rotating motion to extract crude oil from the oil well and transport it to the ground oil storage facilities through pipelines.

[0003] Currently, 380V AC power is used to drive loads through inverters. This method can address the current surge problem during load startup, but the accumulated energy from various aspects of the pumping unit's operation can easily damage the inverter. Furthermore, the pumping unit's power is relatively high, typically around 20kW, resulting in high energy consumption. To address these issues, some oil production plants use a 380V AC power supply that combines inverters with capacitor energy storage. This method can address the energy accumulation and energy consumption issues, but it comes at the expense of high investment and construction costs. Summary of the Invention

[0004] The embodiment of the present application solves the technical problem of high investment and construction costs when using capacitor energy storage to solve the problems of energy accumulation and energy consumption in the prior art by providing a variable frequency power supply device with dual-circuit power balance.

[0005] An embodiment of the present application provides a variable frequency power supply device with dual-path power balance, comprising: a rectifier unit, wherein the input end of the rectifier unit is connected to an AC power supply grid; two inverter units, wherein the output ends of the two inverter units are used to be connected to two loads respectively; two DC circuits, wherein the two ends of the two DC circuits are respectively connected to the output end of the rectifier circuit and the input end of the two inverter units; two voltage acquisition units, wherein the two voltage acquisition units are respectively connected to the two DC circuits; an energy transmission unit, wherein the two ends of the energy transmission unit are respectively connected to the two DC circuits, and the energy transmission unit has a first direction energy transmission state, a second direction energy transmission state and an interruption state; and an energy balance control unit, wherein the energy balance control unit is connected to the two voltage acquisition units, the energy transmission unit and the two inverter units; and the energy balance control unit is configured to determine the energy state of the two DC circuits according to the signals of the two voltage acquisition units. and the balance voltage between the two DC circuits; wherein the balance voltage is the voltage value when the voltages of the two DC circuits are equal; when there is a voltage difference between the two DC circuits and the voltage of any one of the DC circuits reaches the balance upper limit voltage, the power balance control unit controls the energy transfer unit to be in the first direction energy transfer state or the second direction energy transfer state, so that the electric energy of the DC circuit with higher voltage is transferred to the DC circuit with lower voltage; when both of the DC circuits reach the balance voltage, the power balance control unit controls the energy transfer unit to be in the interruption state; when the balance voltage reaches the balance alarm voltage, the power balance control unit controls the two inverter units to stop working or send an alarm message to the outside; when the balance voltage reaches a preset ratio of the balance alarm voltage, the power balance control unit adjusts the output voltage and output frequency of the two inverter units to reduce the balance voltage.

[0006] In one possible implementation, the power balance control unit includes a microcontroller, and a power transmission drive module and a data acquisition module connected to the microcontroller; the data acquisition module is connected to the two voltage acquisition units, and is configured to receive voltage signals from the two voltage acquisition units and transmit the voltage signals to the microcontroller; the microcontroller is electrically connected to the two inverter units, and is configured to determine the voltages of the two DC circuits and the balance voltage based on the voltage signals, and control the start and stop, output voltage and output frequency of the two inverter units based on the balance voltage, and send a control signal to the power transmission drive module; the power transmission drive module is electrically connected to the energy transmission unit, and is configured to drive the energy transmission unit to change its own state according to the control signal of the microcontroller.

[0007] In one possible implementation, the power balance control unit also includes a Bluetooth module connected to the microcontroller; the Bluetooth module is used to communicate with the electronic terminal via Bluetooth, and is configured to transmit the voltage data determined by the microcontroller to the electronic terminal, receive the control signal from the electronic terminal and transmit it to the microcontroller.

[0008] In a possible implementation, the power balance control unit further includes a remote networking module connected to the microcontroller; the remote networking module is used to connect to a server signal and is configured to transmit data generated by the microcontroller to the server.

[0009] In one possible implementation, the variable frequency power supply device for dual-path power balance further includes: two working parameter monitoring devices, which are used to be connected to the two loads respectively and are configured to monitor the power parameters of the two loads and the posture parameters of the oil pump; the power balance control unit further includes a second data acquisition module, which is connected to the microcontroller and has a signal connection to the two working parameter monitoring devices, and is configured to obtain the posture parameters.

[0010] In one possible implementation, the working parameter monitoring device includes a posture sensor, two of which are respectively installed on the pumping unit and connected to the second data acquisition module, for monitoring the posture parameters and sending the posture parameters to the second data acquisition module; wherein the posture parameters include an upward stroke, a top running stroke, a downward stroke, and a bottom movement stroke.

[0011] In a possible implementation, the second data acquisition is a LORA wireless module, and the LORA wireless module is signal-connected to the two working parameter monitoring devices.

[0012] In one possible implementation, the energy transmission unit includes a thyristor, a first field-effect transistor, and a second field-effect transistor; the control electrode of the thyristor is connected to the power balance control unit; the gate of the first field-effect transistor and the gate of the second field-effect transistor are both connected to the power balance control unit, the source of the first field-effect transistor and the drain of the second field-effect transistor are both connected to one of the DC circuits, and the drain of the first field-effect transistor and the source of the second field-effect transistor are connected to the other DC circuit through the thyristor.

[0013] In a possible implementation, the dual-circuit energy-balanced variable-frequency power supply device further includes: two energy storage circuits respectively connected to the two DC circuits, for storing accumulated electric energy on the two DC circuits.

[0014] In a possible implementation, the energy storage circuit includes a capacitor and a resistor connected in parallel; one end of the capacitor is connected to the DC circuit, and the other end of the capacitor is grounded.

[0015] The technical solutions provided in the embodiments of this application have at least the following technical effects:

[0016] An embodiment of the present application provides a variable frequency power supply device with dual-circuit power balance. When the variable frequency power supply device with dual-circuit power balance is used to power two loads, the input end of the rectifier unit is connected to the AC power supply grid, the rectifier unit rectifies the AC power into DC power and outputs it to two DC circuits, and the two inverter units invert the DC of the two DC circuits into AC and transmit it to the two loads; the two voltage acquisition units can respectively collect voltage data of the DC circuits and transmit the voltage data to the power balance control unit; the power balance control unit can control the state of the energy transmission unit according to the voltage data, and adjust the output voltage and frequency of the inverter unit, so that the voltage of the two DC circuits tends to a balanced voltage, thereby achieving a complementary state of the electric energy of the two loads, reducing energy consumption, and preventing energy accumulation and impact on the AC power supply grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of a dual-circuit power balance variable frequency power supply device provided in an embodiment of the present application being applied to an oil pumping unit;

[0019] Figure 2 A schematic diagram of the structure of the power balance control unit provided in an embodiment of the present application;

[0020] Figure 3 A schematic structural diagram of the energy transfer unit provided in an embodiment of the present application.

[0021] Description of reference numerals:

[0022] 100-rectifier unit; 200-inverter unit; 300-DC circuit; 400-voltage acquisition unit; 500-energy transmission unit; 510-first field-effect transistor; 520-second field-effect transistor; 530-thyristor; 600-power balance control unit; 610-microcontroller; 620-power transmission drive module; 630-first data acquisition module; 640-Bluetooth module; 650-remote networking module; 660-second data acquisition module; 700-working parameter monitoring equipment; 800-energy storage circuit; 810-capacitor; 820-resistor; 900-oil pump; 910-motor. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] In the description of the embodiments of the present application, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0025] The embodiment of the present application provides a dual-circuit power balance variable frequency power supply device, such as Figure 1 As shown, the dual-path power balance variable frequency power supply device includes a rectifier unit 100 , two inverter units 200 , two DC circuits 300 , two voltage acquisition units 400 , an energy transmission unit 500 and a power balance control unit 600 .

[0026] The input end of the rectifier unit 100 is connected to the AC power grid. The rectifier unit 100 can rectify the AC power of the AC power grid into DC power. For example, the AC power can be 380V AC power. After the rectification process of the rectifier unit 100, the rectifier unit 100 outputs two 537V DC power lines.

[0027] The output ends of the two inverter units 200 are used to connect to two loads respectively. The inverter unit 200 can invert DC power into AC power. The two inverter units 200 provide AC power to the two loads respectively. For example, when the dual-circuit power balance variable frequency power supply device is applied to two oil pumping units, the load is the motor 910 of the oil pumping unit 900, such as Figure 1 shown.

[0028] Two ends of the two DC circuits 300 are respectively connected to the output end of the rectifier circuit and the input ends of the two inverter units 200 , and are used to transmit the DC power generated by the rectifier unit 100 to the inverter unit 200 .

[0029] Two voltage acquisition units 400 are connected to the two DC circuits 300, respectively, to collect voltage information from the two DC circuits 300. When the load is the motor 910 of the pumping unit 900, the load power will vary. During the downstroke of the pumping unit 900, the motor 910 will generate reverse power, causing the voltages on the two DC circuits 300 to vary. The two voltage acquisition units 400 can respectively collect the voltage values ​​of the two DC circuits 300 in real time.

[0030] The two ends of the energy transmission unit 500 are respectively connected to the two DC circuits 300, and the energy transmission unit 500 has a first direction energy transmission state, a second direction energy transmission state and an interruption state, and is used to transfer electric energy between the two DC circuits 300 so that the two DC circuits 300 tend to be balanced; wherein, the balance of the two DC circuits 300 means that the voltages of the two DC circuits 300 are equal. Figure 1 As shown in the figure, for example, when the energy transmission unit 500 is in the first direction energy transmission state, the electric energy on the left DC circuit 300 is transmitted to the right DC circuit 300; when the energy transmission unit 500 is in the second direction energy transmission state, the electric energy on the right DC circuit 300 is transmitted to the left DC circuit 300; when the energy transmission unit 500 is in the interruption state, the left DC circuit 300 and the right DC circuit 300 stop the energy transmission process.

[0031] The power balance control unit 600 is connected to the two voltage acquisition units 400, the energy transmission unit 500, and the two inverter units 200. Furthermore, the power balance control unit 600 is configured to determine the voltages of the two DC circuits 300 and the equilibrium voltage between the two DC circuits 300 based on the signals from the two voltage acquisition units 400. The equilibrium voltage is the voltage value when the voltages of the two DC circuits 300 are equal.

[0032] When there is a voltage difference between the two DC circuits 300 and the voltage of any DC circuit 300 reaches the upper limit voltage of balance, the power balance control unit 600 controls the energy transmission unit 500 to be in the first direction energy transmission state or the second direction energy transmission state, so that the electric energy of the DC circuit 300 with the higher voltage is transferred to the DC circuit 300 with the lower voltage; when both DC circuits 300 reach the balance voltage, the power balance control unit 600 controls the energy transmission unit 500 to be in the interruption state; when the balance voltage reaches the balance alarm voltage, the power balance control unit 600 controls the two inverter units 200 to stop working or send an alarm message to the outside; when the balance voltage reaches a preset ratio of the balance alarm voltage, for example, the preset ratio is 80%, the power balance control unit 600 adjusts the output voltage and output frequency of the two inverter units 200 to reduce the balance voltage.

[0033] It should be noted that the balance upper limit voltage and the balance alarm voltage are both artificially preset values ​​in the microcontroller and can be artificially adjusted according to actual conditions.

[0034] When using this dual-path power-balanced variable-frequency power supply device to power two loads, the input end of the rectifier unit 100 is connected to the AC power grid. The rectifier unit 100 rectifies the AC power into DC power and outputs it to the two DC circuits 300. The two inverter units 200 invert the DC power of the two DC circuits 300 into AC power and transmit it to the two loads. The two voltage acquisition units 400 can respectively collect voltage data from the DC circuits 300 and transmit the voltage data to the power balance control unit 600. The power balance control unit 600 determines the balance voltage, balance upper limit voltage, balance alarm voltage, and balance no-load voltage between the two DC circuits 300 based on the voltages of the two DC circuits 300. The power balance control unit 600 controls the state of the energy transmission unit 500 based on the voltage data and adjusts the output voltage and frequency of the inverter unit 200 so that the voltages of the two DC circuits 300 approach the balance voltage. The power of the two loads is complementary, reducing power consumption and preventing power accumulation.

[0035] Figure 1 A schematic diagram shows a dual-circuit power supply device providing power to two pumping units 900. As the motor 910 of each pumping unit 900 rotates, its motor head reciprocates up and down. When the motor head 900 moves upward, it lifts the sucker rod, drawing crude oil from the well upward and consuming power from the motor 910. When the motor head moves downward, it drives the motor 910 to generate reverse power, increasing the voltage on the corresponding DC circuit 300.

[0036] when Figure 1When the right pumping unit 900 is in the upstroke stage and the left pumping unit 900 is in the downstroke stage, the motor 910 of the right pumping unit 900 consumes electric energy, and the motor 910 of the left pumping unit 900 generates electric energy. At this time, there is a difference in voltage between the two DC circuits 300. When the voltage on the DC circuit 300 corresponding to the left pumping unit 900 is greater than the upper limit voltage of the balance, part of the electric energy of the left DC circuit 300 is transmitted to the right DC circuit 300 until the two DC circuits 300 reach a balance voltage. Similarly, when Figure 1 When the oil pumping unit 900 on the left is in the upstroke stage and the oil pumping unit 900 on the right is in the downstroke stage, the motor 910 of the oil pumping unit 900 on the left consumes electrical energy, and the motor 910 of the oil pumping unit 900 on the right generates electrical energy. At this time, there is a difference in voltage between the two DC circuits 300. When the voltage on the DC circuit 300 corresponding to the oil pumping unit 900 on the right is greater than the balance upper limit voltage, part of the electrical energy of the DC circuit 300 on the right is transmitted to the DC circuit 300 on the right until the two DC circuits 300 reach a balance voltage.

[0037] like Figure 2 As shown, in the embodiment of the present application, the power balance control unit 600 includes a microcontroller 610, and a power transmission drive module 620 and a first data acquisition module 630 connected to the microcontroller 610. The first data acquisition module 630 is connected to the two voltage acquisition units 400 and is configured to receive voltage signals from the two voltage acquisition units 400 and transmit the voltage signals to the microcontroller 610. The microcontroller 610 is electrically connected to the two inverter units 200 and is configured to determine the voltage and balance voltage of the two DC circuits 300 based on the voltage signals, control the start and stop of the two inverter units 200, and output voltage and output frequency based on the balance voltage, and send control signals to the power transmission drive module 620. The power transmission drive module 620 is electrically connected to the energy transmission unit 500 and is configured to drive the energy transmission unit 500 to change its state according to the control signal from the microcontroller 610.

[0038] When the microcontroller 610 determines based on the voltage signals collected by the two voltage acquisition units 400 that the voltage of the left DC circuit 300 is greater than the voltage of the right DC circuit 300, the microcontroller 610 sends a control signal to the power transmission drive module 620, and the control signal is used to instruct the power transmission drive module 620 to control the drive energy transmission unit 500 to switch to the first direction energy transmission state; accordingly, when the microcontroller 610 determines based on the voltage signals collected by the two voltage acquisition units 400 that the voltage of the right DC circuit 300 is greater than the voltage of the left DC circuit 300, the microcontroller 610 sends a control signal to the power transmission drive module 620, and the control signal is used to instruct the power transmission drive module 620 to control the drive energy transmission unit 500 to switch to the second direction energy transmission state.

[0039] When the balancing voltage reaches the balancing alarm voltage, the microcontroller 610 controls the two inverter units 200 to stop working or send an alarm signal to the outside. When the balancing voltage reaches a preset ratio of the balancing alarm voltage, the microcontroller 610 controls the output voltage and output frequency of the two inverter units 200 to reduce the balancing voltage between the two DC circuits 300.

[0040] Continue to refer to Figure 2 The power balance control unit 600 further includes a Bluetooth module 640 connected to the microcontroller 610. The Bluetooth module 640 is used to communicate with the electronic terminal via Bluetooth and is configured to transmit voltage data determined by the microcontroller 610 and the status of the energy transmission unit 500 to the electronic terminal, and receive control signals from the electronic terminal and transmit them to the microcontroller 610.

[0041] The microcontroller 610 establishes communication with the electronic terminal via the Bluetooth module 640. The oil production plant's operation and maintenance personnel can view voltage data and the status of the energy transmission unit 500 through the electronic terminal. Furthermore, the operation and maintenance personnel can use the electronic terminal to send control signals to the microcontroller 610. The Bluetooth module 640 of the power balance control unit 600 receives the control signals and forwards them to the microcontroller 610. The electronic terminal can be a device capable of Bluetooth communication, such as a mobile phone, tablet computer, or laptop computer.

[0042] Furthermore, the power balance control unit 600 includes a remote networking module 650 connected to the microcontroller 610. The remote networking module 650 is configured to communicate with a server and transmit data generated by the microcontroller 610 to the server. The server can be an existing data center at the oil production plant, a standalone server, or a server communicatively connected to the existing data center at the oil production plant.

[0043] Oilfield operators can use a monitoring platform connected to the server for real-time monitoring, helping to promptly identify and resolve problems and improving the reliability and efficiency of the dual-circuit power balance variable frequency power supply. Furthermore, the remote networking module 650 can receive commands from the server, allowing operators to remotely adjust the settings of the power balance control unit 600 and send control commands to the microcontroller 610.

[0044] Furthermore, if Figure 1 As shown, the variable frequency power supply device with dual-path power balance provided in the embodiment of the present application also includes two working parameter monitoring devices 700, which are used to be connected to two loads respectively and electrically connected to the power balance control unit 600, and are configured to monitor the power parameters of the two loads and the posture parameters of the oil pump 900.

[0045] The power balancing control unit 600 also includes a second data acquisition module 660, which is connected to the microcontroller 610 and signal-connected to the two operating parameter monitoring devices 700. The second data acquisition module 660 is configured to obtain the power parameters of the two loads and the posture parameters of the pumping unit 900, and transmit the posture parameters to the microcontroller 610. Based on the parameters obtained by the two operating parameter monitoring devices 700, the microcontroller 610 can determine the cause of the voltage changes in the two DC circuits 300. This data can serve as the basis for the microcontroller 610 to balance the power in the two DC circuits 300 via the power transmission drive module 620.

[0046] Specifically, the working parameter monitoring device 700 in the embodiment of the present application includes a posture sensor, two posture sensors are respectively installed on the oil pump 900, and are connected to the second data acquisition module 660, for monitoring the posture parameters and sending the posture parameters to the second data acquisition module 660; wherein the posture parameters include upward stroke, top running stroke, downward stroke and bottom movement stroke.

[0047] Specifically, the second data acquisition module 660 is a LORA wireless module. The two working parameter monitoring devices 700 send the posture parameters to the second data acquisition module 660 wirelessly. The LORA wireless module is signal-connected to the two working parameter monitoring devices.

[0048] Of course, in other embodiments of the present application, the second data acquisition module 660 may also be a narrowband Internet of Things (NB-IoT) module.

[0049] like Figure 3 As shown, in the embodiment of the present application, the energy transmission unit 500 includes a thyristor 530, a first field-effect transistor 510, and a second field-effect transistor 520. The control electrode of the thyristor 530 is connected to the power balance control unit 600; the gate of the first field-effect transistor 510 and the gate of the second field-effect transistor 520 are both connected to the power balance control unit 600, the source of the first field-effect transistor 510 and the drain of the second field-effect transistor 520 are both connected to one of the DC circuits 300, and the drain of the first field-effect transistor 510 and the source of the second field-effect transistor 520 are connected to the other DC circuit 300 through the thyristor 530.

[0050] When the energy transfer unit 500 is required to be in a first-direction energy transfer state, the power balance control unit 600 connects the thyristor 530 through the control electrode of the thyristor 530. The power balance control unit 600 controls the source and drain of the first field-effect transistor 510 through the gate of the first field-effect transistor 510 to be in a connected state. The power balance control unit 600 controls the source and drain of the second field-effect transistor 520 through the gate of the second field-effect transistor 520 to be in a disconnected state. When the energy transfer unit 500 is required to be in a second-direction energy transfer state, the power balance control unit 600 connects the thyristor 530 through the control electrode of the thyristor 530. The power balance control unit 600 controls the source and drain of the second field-effect transistor 520 through the gate of the second field-effect transistor 520 to be in a connected state. The power balance control unit 600 controls the source and drain of the first field-effect transistor 510 through the gate of the first field-effect transistor 510 to be in a disconnected state. When the energy transmission unit 500 is required to be in the interrupted state, the power balance control unit 600 puts the thyristor 530 in the disconnected state through the control electrode of the thyristor 530 .

[0051] like Figure 1 As shown, the variable frequency power supply device with dual-circuit power balance provided in the embodiment of the present application further includes: two energy storage circuits 800 respectively connected to the two DC circuits 300, and the two energy storage circuits 800 are used to store the accumulated electric energy on the two DC circuits 300.

[0052] When there is accumulated electrical energy in the DC circuit 300 , the accumulated electrical energy is stored in the energy storage circuit 800 , thereby preventing the accumulated electrical energy from damaging the electronic devices in the rectifier unit 100 and the inverter unit 200 .

[0053] Specifically, tank circuit 800 includes a capacitor 810 and a resistor 820 connected in parallel. One end of capacitor 810 is connected to DC circuit 300, and the other end of capacitor 810 is grounded. In tank circuit 800, the capacitor is used to store electrical energy. When the circuit is connected, the power supply charges the capacitor through resistor 820. When the circuit is disconnected, the capacitor discharges through resistor 820.

[0054] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0055] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A variable frequency power supply device with dual-circuit power balance, characterized in that: include: A rectifier unit, wherein an input end of the rectifier unit is connected to an AC power supply grid; Two inverter units, wherein output ends of the two inverter units are respectively connected to two loads; Two DC circuits, two ends of the two DC circuits are respectively connected to the output end of the rectifier unit and the input ends of the two inverter units; Two voltage acquisition units, the two voltage acquisition units being connected to the two DC circuits respectively; An energy transmission unit, wherein both ends of the energy transmission unit are respectively connected to the two DC circuits, and the energy transmission unit has a first direction energy transmission state, a second direction energy transmission state, and an interruption state; Two working parameter monitoring devices, the two working parameter monitoring devices are used to be connected to the two loads respectively, and are configured to monitor the power parameters of the two loads and the posture parameters of the pumping unit; as well as an electric energy balance control unit, the electric energy balance control unit being connected to the two voltage acquisition units, the energy transmission unit, and the two inverter units; and the electric energy balance control unit being configured to determine the voltages of the two DC circuits and a balance voltage between the two DC circuits based on signals from the two voltage acquisition units; wherein the balance voltage is a voltage value when the voltages of the two DC circuits are equal; When there is a voltage difference between the two DC circuits and the voltage of any one of the DC circuits reaches the upper limit voltage of balance, the power balance control unit controls the energy transfer unit to be in the first direction energy transfer state or the second direction energy transfer state, so that the power energy of the DC circuit with the higher voltage is transferred to the DC circuit with the lower voltage; when both the DC circuits reach the balance voltage, the power balance control unit controls the energy transfer unit to be in the interruption state; When the balancing voltage reaches the balancing alarm voltage, the power balancing control unit controls the two inverter units to stop working or send an alarm message to the outside; when the balancing voltage reaches a preset ratio of the balancing alarm voltage, the power balancing control unit adjusts the output voltage and output frequency of the two inverter units to reduce the balancing voltage; The electric energy balance control unit includes a microcontroller, and an electric energy transmission drive module connected to the microcontroller, a first data acquisition module, and a second data acquisition module; the first data acquisition module is connected to the two voltage acquisition units, and is configured to receive voltage signals from the two voltage acquisition units and transmit the voltage signals to the microcontroller; the microcontroller is electrically connected to the two inverter units, and is configured to determine the voltages of the two DC circuits and the balance voltage according to the voltage signals, and control the start and stop, output voltage and output frequency of the two inverter units according to the balance voltage, and send a control signal to the electric energy transmission drive module; the electric energy transmission drive module is electrically connected to the energy transmission unit, and is configured to drive the energy transmission unit to change its own state according to the control signal of the microcontroller; the second data acquisition module is connected to the microcontroller and is signal-connected to the two working parameter monitoring devices, and is configured to obtain the posture parameters; The working parameter monitoring device includes a posture sensor, two of which are respectively installed on the pumping unit and connected to the second data acquisition module, for monitoring the posture parameters and sending the posture parameters to the second data acquisition module; wherein the posture parameters include an upward stroke, a top running stroke, a downward stroke, and a bottom movement stroke; The energy transmission unit includes a thyristor, a first field-effect transistor and a second field-effect transistor; the control electrode of the thyristor is connected to the power balance control unit; the gate of the first field-effect transistor and the gate of the second field-effect transistor are both connected to the power balance control unit, the source of the first field-effect transistor and the drain of the second field-effect transistor are both connected to one of the DC circuits, and the drain of the first field-effect transistor and the source of the second field-effect transistor are connected to the other DC circuit through the thyristor.

2. The variable frequency power supply device with dual-circuit power balance according to claim 1, characterized in that: The power balance control unit further includes a Bluetooth module connected to the microcontroller; The Bluetooth module is used to communicate with the electronic terminal via Bluetooth, and is configured to transmit the voltage data determined by the microcontroller to the electronic terminal, receive the control signal from the electronic terminal and transmit it to the microcontroller.

3. The variable frequency power supply device with dual-circuit power balance according to claim 1 or 2, characterized in that: The power balance control unit further includes a remote networking module connected to the microcontroller; The remote networking module is used for signal connection with a server and is configured to transmit the data generated by the microcontroller to the server.

4. The variable frequency power supply device with dual-circuit power balance according to claim 1, characterized in that: The second data acquisition is a LORA wireless module, and the LORA wireless module is signal-connected to the two working parameter monitoring devices.

5. The variable frequency power supply device with dual-circuit power balance according to claim 1, characterized in that: Also includes: The two energy storage circuits are respectively connected to the two DC circuits and are used to store the accumulated electric energy on the two DC circuits.

6. The variable frequency power supply device with dual-circuit power balance according to claim 5, characterized in that: The energy storage circuit includes a capacitor and a resistor arranged in parallel; One end of the capacitor is connected to the DC circuit, and the other end of the capacitor is grounded.

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