Oil well power distribution system and synchronous control circuit thereof

Abstract

The utility model relates to an oil well power distribution system and a synchronous control circuit thereof. The circuit comprises an acquisition unit used for outputting a generator switching instruction; the synchronizing device is used for monitoring the output voltage, the voltage frequency and the voltage phase of the generator to be connected with the grid and the generator to be disconnected from the grid in each generator; the synchronizing switching unit is used for connecting each generator and controlling the to-be-connected generator and the to-be-disconnected generator to be connected with the synchronizing device; the adjusting unit is used for outputting an adjusting signal for adjusting the output voltage and the voltage frequency of each generator; the power supply switching unit is used for connecting the power supply bus and each generator, and controlling the to-be-connected generator to be connected with the power supply bus and controlling the to-be-disconnected generator to be disconnected from the power supply bus when the output voltage and the voltage frequency of the to-be-connected generator and the output voltage and the voltage frequency of the to-be-disconnected generator are approximately equal; and a control unit. According to the utility model, synchronous parallel operation and power switching of a plurality of generators can be realized under the condition that only one set of synchronizing device is used.

Description

Technical Field

[0001] This utility model relates to the field of petroleum industry technology, and in particular to oil well power distribution systems and their synchronous control circuits. Background Technology

[0002] In some oil wells, the power distribution system is equipped with a redundant generator in addition to the main generator. This redundant generator can provide power in case the main generator malfunctions, thus requiring only one synchronizing device. However, when both generators fail to supply power, it can lead to power loss in the well's facilities, severely impacting economic efficiency. While more generators could be added to improve the power supply stability of the oil well's power distribution system, current technologies only allow for the simultaneous operation of two generators, making it impossible to switch power to more than three generators online. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an oil well power distribution system and its synchronous control circuit.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a synchronization control circuit for an oil well power distribution system, wherein the oil well power distribution system includes N generators, where N is a natural number greater than 2, and the synchronization control circuit includes:

[0005] Acquisition unit for outputting generator switching commands;

[0006] A synchronization device for monitoring the output voltage, voltage frequency, and voltage phase of the generators to be connected to the grid and the generators to be disconnected from the grid in each of the aforementioned generators;

[0007] A synchronization switching unit connected to the synchronizing device, used to connect each of the generators and control the connection between the generator to be connected to the grid and the generator to be disconnected from the grid and the synchronizing device;

[0008] A regulating unit for outputting regulating signals to regulate the output voltage and voltage frequency of each of the generators;

[0009] A power supply switching unit for connecting the power supply bus and each of the generators, and controlling the generator to be connected to the power supply bus and controlling the generator to be disconnected from the power supply bus when the output voltage and voltage frequency of the generator to be connected to the grid and the generator to be disconnected from the grid are close to equal.

[0010] A control unit connected to the acquisition unit, the synchronization switching unit, the adjustment unit, the synchronization device, and the power supply switching unit.

[0011] Preferably, the acquisition unit includes several instruction output switches;

[0012] Each of the command output switches includes an idle circuit and several generator switching circuits; the idle circuit and each of the generator switching circuits are connected to the control unit.

[0013] Preferably, the synchronization switching unit includes a first relay, a first voltage transformer, a second voltage transformer, and a plurality of second relays;

[0014] The excitation coil of the first relay is connected to the control unit. The first end of the normally closed circuit of the first relay is connected to the power supply bus via the first voltage transformer, and the second end is connected to the grid voltage detection terminal of the synchronizing device. The first end of the normally open circuit of the first relay is connected to the grid voltage detection terminal of the synchronizing device, and the second end is connected one-to-one to each of the generators via the normally open circuits of each of the second relays. The excitation coil of the second relay is connected to the control unit. The detection terminal of the generator to be connected to the synchronizing device is connected to the generator to be connected to the grid via the second voltage transformer.

[0015] Preferably, the regulating unit includes a third relay; the third relay includes four normally open circuits; the first end of the four normally open circuits of the third relay is connected to the control unit, and the second end is connected in sequence to the boost control terminal, buck control terminal, frequency boost control terminal and frequency buck control terminal of the oil well power distribution system; the excitation coil of the third relay is connected to the control unit.

[0016] Preferably, the synchronization control circuit further includes:

[0017] A mode setting unit connected to the adjustment unit for setting the working mode to manual synchronization mode or automatic synchronization mode;

[0018] A detection unit connected to the synchronous switching unit, used to detect and display the voltage phase, voltage frequency and output voltage of the generator to be connected to the grid and the generator to be disconnected from the grid.

[0019] Preferably, the mode setting unit includes a mode switching switch, a boost adjustment switch, a buck adjustment switch, a boost frequency adjustment switch, and a buck frequency adjustment switch; wherein, the mode switching switch includes at least two manual synchronization circuits that can be closed or opened simultaneously, and at least two automatic synchronization circuits that can be closed or opened simultaneously.

[0020] The first end of the first manual synchronization circuit is connected to the control unit, and the second end of the first manual synchronization circuit is connected to the boost control terminal via the boost adjustment switch and to the buck control terminal via the buck adjustment switch.

[0021] The first end of the second manual synchronization circuit is connected to the control unit, and the second end of the second manual synchronization circuit is connected to the frequency up control terminal via the frequency up adjustment switch and to the frequency down control terminal via the frequency down adjustment switch.

[0022] The first end of the first automatic synchronization circuit is connected to the control unit, and the second end of the first automatic synchronization circuit is connected to the boost control terminal via the first normally open circuit of the third relay, and to the buck control terminal via the second normally open circuit of the third relay.

[0023] The first end of the second automatic synchronization circuit is connected to the control unit, and the second end of the second automatic synchronization circuit is connected to the up-frequency control terminal via the third normally open circuit of the third relay, and to the down-frequency control terminal via the fourth normally open circuit of the third relay.

[0024] Preferably, the detection unit includes a synchronization meter, a frequency meter, a voltmeter, a fourth relay, and a fifth relay; the number of both the manual synchronization circuit and the automatic synchronization circuit is three.

[0025] The first detection terminal of the synchronization meter is connected to the first terminal of the normally closed circuit of the first relay via the first normally open circuit of the fourth relay. The second detection terminal of the synchronization meter is connected to the first terminal of the normally open circuit of the fifth relay via the second normally open circuit of the fourth relay. The second terminal of the normally open circuit of the fifth relay is connected to the detection terminal of the generator to be paralleled by the synchronizing device.

[0026] The first detection terminal of the frequency meter and the first detection terminal of the voltmeter are simultaneously connected to the first terminal of the normally closed circuit of the first relay, and the second detection terminal of the frequency meter and the second detection terminal of the voltmeter are simultaneously connected to the first terminal of the normally open circuit of the fifth relay.

[0027] The excitation coil of the fourth relay is connected to the input power supply via the third manual synchronization circuit, and the excitation coil of the fifth relay is connected to the input power supply via the third automatic synchronization circuit.

[0028] Preferably, the control unit includes a synchronization request unit and a PLC controller;

[0029] The PLC controller is connected to the synchronization request unit, the acquisition unit, the synchronization switching unit, the adjustment unit, the synchronization device, and the power supply switching unit.

[0030] Preferably, the power supply switching unit includes N circuit breakers;

[0031] Each of the circuit breakers is connected one-to-one between the power supply bus and each of the generators.

[0032] This utility model also constructs an oil well power distribution system, including:

[0033] The synchronization control circuit described above.

[0034] There are N generators, where N is a natural number greater than 2.

[0035] The present invention has the following advantages: it provides a synchronization control circuit that enables multiple generators to be synchronized and switched on and off using only one synchronization device, thus solving the problem of high difficulty in online paralleling and switching between multiple generators. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0037] Figure 1 This is a circuit structure block diagram of the synchronization control circuit in some embodiments of this utility model;

[0038] Figure 2 This is a circuit diagram of the control unit in some embodiments of this utility model;

[0039] Figure 3 This is a circuit diagram of the synchronous switching unit in some embodiments of this utility model;

[0040] Figure 4 This is a circuit diagram of the adjustment unit in some embodiments of this utility model;

[0041] Figure 5 This is a circuit diagram of the mode setting unit in some embodiments of this utility model. Detailed Implementation

[0042] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0043] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] This invention provides a synchronization control circuit for oil well power distribution systems. This circuit enables simultaneous operation and power switching of multiple generators using only one synchronization device, solving the problem of high difficulty in online parallel operation and switching between multiple generators. Furthermore, the oil well power distribution system can include N generators (100), where N is a natural number greater than 2. It can be understood that the oil well power distribution system includes at least two generators in addition to the main generator and emergency generator, as well as a synchronization switching unit 3.

[0045] like Figure 1 As shown, the synchronization control circuit may include an acquisition unit 1, a synchronization device 2, a synchronization switching unit 3, an adjustment unit 4, a power supply switching unit 5, and a control unit 6.

[0046] The acquisition unit 1 is used to output generator switching commands based on the operator's operation. The generator switching commands are sent to the control unit 6, so that the control unit 6 can determine the generators to be connected to the grid and the generators to be disconnected from the grid among the N generators 100 that need to be connected to the grid simultaneously, based on the generator switching commands.

[0047] In some embodiments, as Figure 2 As shown, the acquisition unit 1 includes several command output switches 11. Each command output switch 11 includes an idle circuit and several generator switching circuits; the idle circuit and each generator switching circuit are connected to the control unit 6. Specifically, when a command output switch 11 does not need to output a generator switching command, the operator can operate the command output switch 11 to close its idle circuit, so that the command output switch 11 will not issue any generator switching command; when a command output switch 11 needs to output a switching command that can control two generators to achieve synchronous parallel operation, the operator can operate the command output switch 11 to close its corresponding generator switching circuit. It can be understood that during normal operation, at most one switch of each command output switch 11 will be set to the generator switching circuit, that is, when a command output switch 11 does not need to output relevant commands, it can be switched to the idle circuit.

[0048] In some embodiments, N equals 4, specifically including the main generator, emergency generator, typhoon generator, and drilling generator. The main generator and emergency generator are essential generators, meaning the remaining two generators can be replaced by other generators. Correspondingly, there are three command output switches 11. The first command output switch 11 includes four generator switching circuits, the second command output switch 11 includes two generator switching circuits, and the third command output switch 11 includes one generator switching circuit. That is, the three command output switches 11 can output seven synchronization commands, specifically including: emergency generator replacing main generator command, main generator replacing emergency generator command, emergency generator replacing drilling generator command, drilling generator replacing emergency generator command, typhoon generator replacing emergency generator command, emergency generator replacing typhoon generator command, and emergency generator replacing main generator command in typhoon avoidance mode.

[0049] It should be noted that the generator replacement logic in the oil well power distribution system is as follows: When the main generator malfunctions or needs to be shut down, the emergency generator is used as the priority replacement power source; when both the emergency generator and the main generator malfunction or need to be shut down, the drilling generator is used as the priority replacement power source; when a typhoon occurs, since the main generator needs to be shut down, the typhoon generator is used as the priority replacement power source. However, the auxiliary equipment of the main generator (such as oil pumps) cannot be shut down immediately along with the main generator. Therefore, before the typhoon generator is started, the emergency generator needs to temporarily supply power to the auxiliary equipment of the main generator. At this time, the operator needs to operate the command output switch 11 to output the "emergency generator replaces main generator command in typhoon avoidance mode". After confirming that the main generator is not malfunctioning, the operator should operate the command output switch 11 again to output the "typhoon generator replaces emergency generator command", so that the typhoon generator can replace the main generator power source. Furthermore, before the main generator is started, its auxiliary equipment needs to be preheated and started in advance. Therefore, before the main generator is started, it is necessary to supply power to the running emergency generator, and at the same time supply power to the relevant loads and the auxiliary equipment of the main generator. After the auxiliary equipment has been preheated, the main generator replaces the emergency generator for power supply.

[0050] Synchronization device 2 is used to monitor the output voltage and voltage frequency of the generators to be connected to the grid and the generators to be disconnected from the grid in each generator 100. Specifically, synchronization device 2 can be an existing synchronization device installed in the oil well power distribution system.

[0051] See Figure 1The synchronization switching unit 3 is connected to the synchronization device 2. The synchronization switching unit 3 is used to connect each generator 100 and control the generator to be connected to the grid and the generator to be disconnected from the grid to be connected to the synchronization device 2. Specifically, the function of the synchronization switching unit 3 is to connect the generator to be connected to the grid and the generator to be disconnected from the grid among the N generators to the synchronization device 2. The synchronization device 2 can then monitor the output voltage, voltage frequency, and voltage phase of the generator to be connected to the grid and the generator to be disconnected from the grid. Then, when the output voltage, voltage frequency, and voltage phase of the generator to be connected to the grid and the generator to be disconnected from the grid are close to equal, it outputs a switching permission command to the control unit 6, so that the control unit 6 can implement the specific steps of synchronization.

[0052] In some embodiments, as Figure 2 and Figure 3 As shown, the synchronization switching unit 3 includes a first relay 31, a first voltage transformer 32, a second voltage transformer 33, and multiple second relays 34. The excitation coil of the first relay 31 is connected to the control unit 6. The first end of the normally closed circuit of the first relay 31 is connected to the power supply bus 200 via the first voltage transformer 32. The second end of the normally closed circuit of the first relay 31 is connected to the grid voltage detection terminal of the synchronization device 2. The first end of the normally open circuit of the first relay 31 is connected to the grid voltage detection terminal of the synchronization device 2. The second end of the normally open circuit of the first relay 31 is connected one-to-one to each generator 100 via the normally open circuit of each second relay 34. The excitation coil of the second relay 34 is connected to the control unit 6. The detection terminal of the generator to be connected to the synchronization device 2 is connected to the generator to be connected to the grid via the second voltage transformer 33.

[0053] Specifically, according to the generator replacement logic described above, the emergency generator will immediately take over power supply when the main generator malfunctions or shuts down (i.e., it has the highest replacement priority). Therefore, before the typhoon generator and drilling generator are started, the emergency generator usually provides power. When the emergency generator malfunctions, the drilling generator is used to replace it. Alternatively, during typhoon weather, the typhoon generator is used to replace the emergency generator. In other words, the drilling generator and typhoon generator effectively replace the emergency generator for power supply. Therefore, in some embodiments, such as... Figure 3 As shown, the generator detection terminal of the synchronizing device 2 can be connected to the emergency generator 9 via the second voltage transformer 33.

[0054] Taking the replacement of an emergency generator with a typhoon generator as an example, the output voltage of the emergency generator is first input to the detection terminal of the generator to be paralleled by the generator being stepped down by the second voltage transformer 33 (the fifth relay 85 is energized). This allows the synchronizing device 2 to monitor the output voltage, voltage frequency, and voltage phase of the emergency generator. At the same time, the control unit 6 also controls the second relay 34 connected to the typhoon generator to be energized (the other second relays 34 are de-energized) and the first relay 31 to be energized. In this way, the synchronizing device 2 can monitor the output voltage, voltage frequency, and voltage phase of the typhoon generator. At this time, the synchronizing device 2 can compare whether the output voltage of the emergency generator replacing the typhoon generator can meet the synchronization requirements. When the synchronization requirements are met, the synchronizing device 2 outputs a switching permission command to the control unit 6.

[0055] See Figure 3 The working principle of the synchronization switching unit 3 is as follows: Taking the emergency generator malfunction and the drilling generator to replace it as an example, it should be noted that at this time, the main generator is disconnected from the power supply bus 200, and the emergency generator is connected to the power supply bus 200. First, the operator outputs the "drilling generator to replace emergency generator command" through the operation command output switch 11. At this time, the control unit 6 will control the first relay 31 to be energized and the second relay 34 connected to the drilling generator to be energized. In this way, the grid voltage detection terminal of the synchronization device 2 can monitor the output voltage, voltage frequency and voltage phase of the drilling generator, while the generator detection terminal of the synchronization device 2 monitors the output voltage, voltage frequency and voltage phase of the emergency generator. When the emergency generator and the drilling generator output the same frequency, voltage and phase, the synchronization device 2 will output the switching permission command to the control unit 6. Then, the control unit 6 will first control the drilling generator to be connected to the power supply bus 200, and after a certain delay (such as 1 second), control the emergency generator to be disconnected from the power supply bus 200.

[0056] In some embodiments, the number of second relays 34 may be at least three.

[0057] The regulating unit 4 is used to output regulating signals to adjust the output voltage and voltage frequency of each generator 100. Specifically, the regulating unit 4 outputs regulating signals to the oil well power distribution system. It should be noted that since the necessary conditions for generator synchronization include that the voltage frequency, voltage phase, and output voltage of the generator to be connected to the grid must be close to equal to the voltage frequency, voltage phase, and voltage phase of the power supply bus, existing oil well power distribution systems are usually equipped with multiple frequency modulators and multiple voltage regulators corresponding to each generator. The frequency modulators and voltage regulators can adjust the output voltage and voltage frequency of each generator 100 (including the generator to be connected to the grid and the generator to be disconnected from the grid) according to the received regulating signals. It can be understood that since adjusting the output voltage and voltage frequency also affects the voltage phase, the voltage in-phase between generators can be achieved by adjusting the output voltage and voltage frequency.

[0058] In some embodiments, as Figure 4 As shown, the regulating unit 4 may include a third relay 41. The third relay 41 includes four normally open circuits. The first terminals of the four normally open circuits of the third relay 41 are respectively connected to the control unit 6, and the second terminals of the four normally open circuits of the third relay 41 are sequentially connected to the boost control terminal, buck control terminal, frequency boost control terminal, and frequency reduction control terminal of the oil well power distribution system. The excitation coil of the third relay 41 is connected to the control unit 6. Specifically, in automatic synchronization mode, when it is necessary to adjust the output voltage and voltage frequency of the generator, the control unit 6 will control the excitation of the third relay 41. Then, the control unit 6 can control the output voltage and voltage frequency of the generator 100 by inputting analog signals to the boost control terminal, buck control terminal, frequency boost control terminal, and frequency reduction control terminal. It should be noted that the boost control terminal and buck control terminal are simultaneously connected in parallel to the voltage regulators corresponding to each generator, so that the output voltage of each generator is approximately the same at the same time. Similarly, the frequency boost control terminal and frequency reduction control terminal are simultaneously connected in parallel to the frequency regulators corresponding to each generator, so that the voltage frequency of each generator is approximately the same at the same time.

[0059] The power supply switching unit 5 is used to connect the power supply bus 200 and each generator 100, and when the output voltage, voltage frequency and voltage phase of the generator to be connected to the grid and the generator to be disconnected from the grid are close to equal, it controls the generator to be connected to the grid to be connected to the power supply bus 200 and controls the generator to be disconnected from the grid to be disconnected from the power supply bus 200.

[0060] In some embodiments, as Figure 3 As shown, the power supply switching unit 5 includes N circuit breakers 51. Each circuit breaker 51 is connected one-to-one between the power supply bus 200 and each generator 100.

[0061] like Figure 1As shown, the control unit 6 is connected to the acquisition unit 1, the synchronization switching unit 3, the adjustment unit 4, the synchronization device 2, and the power supply switching unit 5. The control unit 6 is used to receive the generator switching command output by the acquisition unit, control the operation of the synchronization switching unit 3 according to the generator switching command, and control the operation of the power supply switching unit 5 based on the generator switching command when it receives the permission switching command output by the synchronization device 2, so as to realize the synchronous parallel operation between multiple generators.

[0062] In some embodiments, as Figure 1 As shown, the synchronization control circuit may also include a mode setting unit 7 and a detection unit 8.

[0063] like Figure 1 As shown, the mode setting unit 7 is connected between the mode setting unit 4 and the mode setting unit 7 is used to set the working mode of the synchronization control circuit to manual synchronization mode or automatic synchronization mode.

[0064] In some embodiments, as Figure 4 As shown, the mode setting unit 7 includes a mode switching switch 71, a boost adjustment switch 72, a buck adjustment switch 73, a boost frequency adjustment switch 74, and a buck frequency adjustment switch 75. The mode switching switch 71 includes at least two channels that can be simultaneously closed or opened, such as... Figure 4 and Figure 5 The manual synchronization circuit 71a shown, and at least two circuits that are simultaneously closed or opened, such as... Figure 4 and Figure 5 The automatic synchronization circuit 71b shown is an example.

[0065] The first end of the first manual synchronizing circuit 71a is connected to the PLC controller 62 included in the control unit 6. The second end of the first manual synchronizing circuit 71a is connected to the boost control terminal via a boost regulating switch 72 and to the buck control terminal via a buck regulating switch 73. The first end of the second manual synchronizing circuit 71a is connected to the PLC controller 62 of the control unit 6. The second end of the second manual synchronizing circuit 71a is connected to the boost control terminal via a frequency regulating switch 74 and to the buck control terminal via a frequency regulating switch 75. In manual synchronizing mode, the operator closes all manual synchronizing circuits 71a of the mode switching switch 71. At this time, the operator can control the generator's output voltage and voltage frequency to increase or decrease by operating the boost regulating switch 72, buck regulating switch 73, frequency regulating switch 74, and frequency regulating switch 75.

[0066] The first terminal of the first automatic synchronizing circuit 71b is connected to the PLC controller 62 of the control unit 6. The second terminal of the first automatic synchronizing circuit 71b is connected to the boost control terminal via the first normally open circuit of the third relay 41, and to the buck control terminal via the second normally open circuit of the third relay 41. The first terminal of the second automatic synchronizing circuit 71b is connected to the PLC controller 62 of the control unit 6. The second terminal of the second automatic synchronizing circuit 71b is connected to the frequency boost control terminal via the third normally open circuit of the third relay 41, and to the frequency reduction control terminal via the fourth normally open circuit of the third relay 41. In automatic synchronizing mode, the operator closes all automatic synchronizing circuits 71b of the mode switching switch 71. At this time, the PLC controller 62 can directly input relevant signals to the boost control terminal, buck control terminal, frequency boost control terminal, and frequency reduction control terminal to control the generator's output voltage and voltage frequency to increase or decrease.

[0067] like Figure 1 As shown, the detection unit 8 is connected to the synchronization switching unit 3. The detection unit 8 is used to detect the voltage phase, voltage frequency, and output voltage of the generator to be connected to the grid and the generator to be disconnected from the grid in manual synchronization mode, and simultaneously display the voltage phase, voltage frequency, and output voltage of the generator to be connected to the grid and the generator to be disconnected from the grid.

[0068] In some embodiments, as Figure 3 and Figure 5 As shown, the detection unit 8 includes a synchronizing meter 81, a frequency meter 82, a voltmeter 83, a fourth relay 84, and a fifth relay 85; there are three manual synchronization circuits 71a and three automatic synchronization circuits 71b. The first detection terminal of the synchronizing meter 81 is connected to the first terminal of the normally closed circuit of the first relay 31 via the first normally open circuit 84a of the fourth relay 84. The second detection terminal of the synchronizing meter 81 is connected to the first terminal of the normally open circuit of the fifth relay 85 via the second normally open circuit 84b of the fourth relay 84. The second terminal of the normally open circuit of the fifth relay 85 is connected to the detection terminal of the generator to be synchronized in the synchronizing device 2. The first detection terminals of the frequency meter 82 and the first detection terminals of the voltmeter 83 are simultaneously connected to the first terminal of the normally closed circuit of the first relay 31. The second detection terminals of the frequency meter 82 and the second detection terminals of the voltmeter 83 are simultaneously connected to the first terminal of the normally open circuit of the fifth relay 85. One end of the excitation coil of the fourth relay 84 is connected to the positive terminal L1 of the input power supply via the third manual synchronization circuit 71a, and the other end is connected to the negative terminal L2 of the input power supply. One end of the excitation coil of the fifth relay 85 is connected to the positive terminal L1 of the input power supply via the third automatic synchronization circuit 71b, and the other end is connected to the negative terminal L2 of the input power supply.

[0069] Understandably, in manual synchronization mode, each manual synchronization circuit 71a closes, the fourth relay 84 is energized, and the second detection terminals of the synchronizing meter 81, frequency meter 82, and voltmeter 83 respectively detect and display the voltage phase, output voltage, and voltage frequency of the emergency generator. Meanwhile, the first detection terminals of the synchronizing meter 81, frequency meter 82, and voltmeter 83 respectively detect the voltage phase, output voltage, and voltage frequency of the power supply bus 200. This allows operators to determine whether the power supply bus 200 and the emergency generator can meet the synchronization requirements. It should be noted that the emergency generator, as the primary redundant generator, is used most frequently to replace the main generator; therefore, manual synchronization mode is typically used when the emergency generator replaces the main generator. In automatic synchronization mode, each automatic synchronization circuit 71b closes, energizing the fifth relay 85, allowing the synchronization device 2 to collect the output of the emergency generator via the second voltage transformer 33.

[0070] In some embodiments, the control unit 6 may include Figure 5 The synchronous request unit 61 shown and Figure 2 The PLC controller 62 shown is connected to a synchronization request unit 61, an acquisition unit 1, a synchronization switching unit 3, an adjustment unit 4, a synchronization device 2, and a power supply switching unit 5. The synchronization request unit 61 outputs synchronization execution instructions based on the operation. The working principle of the PLC controller 62 is as follows: In automatic synchronization mode, it controls the operation of the synchronization switching unit 3 according to the generator switching instruction, and upon receiving a permission switching instruction, it controls the operation of the power supply switching unit 5 based on the generator switching instruction to achieve synchronous parallel operation between multiple generators. In manual synchronization mode, the operator can use the detection unit 8 to observe the voltage phase, voltage frequency, and output voltage of the generator to be connected to the grid and the generator to be disconnected from the grid. When the voltage phase, voltage frequency, and output voltage are all approximately the same, the operator can operate the synchronization request unit 61. After receiving the synchronization execution instruction, the PLC controller 62 will control the operation of the power supply switching unit 5 to achieve synchronous parallel operation between multiple generators.

[0071] In some embodiments, as Figure 2 and Figure 5As shown, the synchronization request unit 61 may include a button 611, a sixth relay 612, and a seventh relay 613. One end of the button 611 is connected to the positive terminal L1 of the input power supply, and the other end is connected to the negative terminal L2 of the input power supply via the normally closed circuit of the sixth relay 612 and the excitation coil of the seventh relay 613. The excitation coil of the sixth relay 612 is connected to the PLC controller 62, and the normally open circuit of the seventh relay 613 is connected to the PLC controller 62. When the operator presses the button 611, the seventh relay 613 is energized, and the normally open circuit of the seventh relay 613 is closed, which is equivalent to inputting a synchronization execution instruction to the PLC controller 62.

[0072] This utility model also provides an oil well power distribution system, which includes the synchronization control circuit provided in the embodiment of this utility model, and N generators 100, where N is a natural number greater than 2.

[0073] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A synchronization control circuit for an oil well power distribution system, the oil well power distribution system comprising N generators (100), where N is a natural number greater than 2, characterized in that, The synchronization control circuit includes: Acquisition unit (1) for outputting generator switching commands; Synchronization device (2) for monitoring the output voltage, voltage frequency and voltage phase of the generators to be connected to the grid and the generators to be disconnected from the grid in each of the generators (100); A synchronization switching unit (3) is connected to the synchronization device (2) and is used to connect each of the generators (100) and control the generators to be connected to the grid and the generators to be disconnected from the grid to be connected to the synchronization device (2). A regulating unit (4) for outputting regulating signals to regulate the output voltage and voltage frequency of each of the generators (100); A power supply switching unit (5) for connecting the power supply bus (200) and each of the generators (100), and controlling the generator to be connected to the power supply bus (200) and the generator to be disconnected from the power supply bus (200) when the output voltage and voltage frequency of the generator to be connected to the grid and the generator to be disconnected from the grid are close to equal; Control unit (6) connected to the acquisition unit (1), the synchronization switching unit (3), the adjustment unit (4), the synchronization device (2) and the power supply switching unit (5).

2. The synchronization control circuit according to claim 1, characterized in that, The acquisition unit (1) includes several instruction output switches (11); Each of the command output switches (11) includes an idle circuit and several generator switching circuits; the idle circuit and each of the generator switching circuits are connected to the control unit (6).

3. The synchronization control circuit according to claim 1, characterized in that, The synchronization switching unit (3) includes a first relay (31), a first voltage transformer (32), a second voltage transformer (33), and a plurality of second relays (34); The excitation coil of the first relay (31) is connected to the control unit (6). The first end of the normally closed circuit of the first relay (31) is connected to the power supply bus (200) via the first voltage transformer (32), and the second end is connected to the grid voltage detection terminal of the synchronizing device (2). The first end of the normally open circuit of the first relay (31) is connected to the grid voltage detection terminal of the synchronizing device (2), and the second end is connected one-to-one to each generator (100) via the normally open circuit of each of the second relays (34). The excitation coil of the second relay (34) is connected to the control unit (6). The detection terminal of the generator to be connected to the synchronizing device (2) is connected to the generator to be connected to the grid via the second voltage transformer (33).

4. The synchronization control circuit according to claim 3, characterized in that, The regulating unit (4) includes a third relay (41); the third relay (41) includes four normally open circuits; the first end of the four normally open circuits of the third relay (41) is connected to the control unit (6) respectively, and the second end is connected in sequence to the boost control terminal, buck control terminal, frequency boost control terminal and frequency buck control terminal of the oil well power distribution system; the excitation coil of the third relay (41) is connected to the control unit (6).

5. The synchronization control circuit according to claim 4, characterized in that, Also includes: A mode setting unit (7) connected between the adjustment unit (4) and the mode setting unit (7) is used to set the working mode to manual synchronization mode or automatic synchronization mode; A detection unit (8) connected to the synchronous switching unit (3) is used to detect and display the voltage phase, voltage frequency and output voltage of the generator to be connected to the grid and the generator to be disconnected from the grid.

6. The synchronization control circuit according to claim 5, characterized in that, The mode setting unit (7) includes a mode switching switch (71), a boost adjustment switch (72), a buck adjustment switch (73), a boost frequency adjustment switch (74), and a buck frequency adjustment switch (75); wherein, the mode switching switch (71) includes at least two manual synchronization circuits that can be closed or opened simultaneously, and at least two automatic synchronization circuits that can be closed or opened simultaneously. The first end of the first manual synchronization circuit is connected to the control unit (6), and the second end of the first manual synchronization circuit is connected to the boost control terminal via the boost adjustment switch (72) and to the buck control terminal via the buck adjustment switch (73). The first end of the second manual synchronization circuit is connected to the control unit (6), and the second end of the second manual synchronization circuit is connected to the frequency control terminal via the frequency increase adjustment switch (74) and the frequency decrease adjustment switch (75). The first end of the first automatic synchronization circuit is connected to the control unit (6), and the second end of the first automatic synchronization circuit is connected to the boost control terminal via the first normally open circuit of the third relay (41), and to the buck control terminal via the second normally open circuit of the third relay (41). The first end of the second automatic synchronization circuit is connected to the control unit (6), and the second end of the second automatic synchronization circuit is connected to the up-frequency control terminal via the third normally open circuit of the third relay (41) and to the down-frequency control terminal via the fourth normally open circuit of the third relay (41).

7. The synchronization control circuit according to claim 6, characterized in that, The detection unit (8) includes a synchronization meter (81), a frequency meter (82), a voltmeter (83), a fourth relay (84), and a fifth relay (85); the number of the manual synchronization circuit and the number of the automatic synchronization circuit are both three. The first detection terminal of the synchronization meter (81) is connected to the first terminal of the normally closed circuit of the first relay (31) via the first normally open circuit of the fourth relay (84). The second detection terminal of the synchronization meter (81) is connected to the first terminal of the normally open circuit of the fifth relay (85) via the second normally open circuit of the fourth relay (84). The second terminal of the normally open circuit of the fifth relay (85) is connected to the generator detection terminal of the synchronizing device (2). The first detection terminal of the frequency meter (82) and the first detection terminal of the voltmeter (83) are simultaneously connected to the first terminal of the normally closed circuit of the first relay (31), and the second detection terminal of the frequency meter (82) and the second detection terminal of the voltmeter (83) are simultaneously connected to the first terminal of the normally open circuit of the fifth relay (85). The excitation coil of the fourth relay (84) is connected to the input power supply via the third manual synchronization circuit, and the excitation coil of the fifth relay (85) is connected to the input power supply via the third automatic synchronization circuit.

8. The synchronization control circuit according to claim 6, characterized in that, The control unit (6) includes a synchronization request unit (61) and a PLC controller (62); The PLC controller (62) is connected to the synchronization request unit (61), the acquisition unit (1), the synchronization switching unit (3), the adjustment unit (4), the synchronization device (2), and the power supply switching unit (5).

9. The synchronization control circuit according to any one of claims 1 to 8, characterized in that, The power supply switching unit (5) includes N circuit breakers (51); Each of the circuit breakers (51) is connected one-to-one between the power supply bus (200) and each of the generators (100).

10. An oil well power distribution system, characterized in that, include: The synchronization control circuit as described in any one of claims 1 to 9; There are N generators (100), where N is a natural number greater than 2.

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