Energy-saving control method, device, equipment and storage medium for offshore oil and gas system

Abstract

The present invention proposes an energy-saving control method, device, equipment, and storage medium for an offshore oil and gas system, including: determining the voltage modulation degree according to the modulation wave frequency of a target water injection pump, and determining the first power from a first mapping table; constructing multiple candidate sets based on multiple target water injection pumps; updating the voltage modulation degree in the candidate set to the minimum value of the first modulation degree interval; determining the first power consumption after determining the target load, target head, and target displacement from a second mapping table according to the voltage modulation degree; determining the candidate set with the smallest sum of the first power consumption as the target set, and starting the target water injection pump of the target set based on the corresponding voltage modulation degree. The voltage modulation degree and the first power can be automatically determined according to the modulation wave frequency input in advance, the voltage modulation degree can be lowered on the basis of maintaining the power to reduce the power consumption, the target set with the lowest power consumption can be screened out according to the power demand, and the start and stop status of each target water injection pump can be automatically determined, so as to improve the control efficiency and reduce the energy consumption of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment energy-saving control, and in particular to an energy-saving control method, device, equipment and storage medium for an offshore oil and gas system. Background Art

[0002] In the field of offshore oil platforms, the extraction process mainly involves water injection into the formation to drive oil. The water injection process involves multiple water injection pumps, and the energy consumption of water injection pumps is an important part of the energy consumption of the oil and gas system. Optimizing the energy consumption of water injection pumps is of great significance for saving energy and improving economic benefits. The driving motor of the water injection pump mainly adopts a variable frequency motor. The controller can set the operating frequency of the variable frequency motor according to the load demand, so that the output power of the water injection pump can match the demand of the oil field.

[0003] During the exploitation of offshore oil fields, the total power demand for water injection pumps will change dynamically with factors such as reservoir permeability, porosity, crude oil viscosity and formation pressure. In related technologies, the operating parameters of each water injection pump are adjusted in real time by the control personnel according to the current total power demand. Not only does it rely on the operating experience of the control personnel, but when there are a large number of water injection pumps, it takes a long time to manually configure the operating parameters, which not only reduces the control efficiency, but also leads to a high total energy consumption of the water injection pump before the configuration is completed, resulting in a waste of resources. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an energy-saving control method, device, equipment, and storage medium for an offshore oil and gas system, which can automatically determine the start and stop status of each water injection pump, improve energy-saving control efficiency, and reduce energy consumption.

[0005] In a first aspect, an embodiment of the present invention provides an energy-saving control method for an offshore oil and gas system, wherein the offshore oil and gas system comprises a plurality of target water injection pumps, each of the target water injection pumps is preset with a modulation wave frequency, and the values ​​of at least two of the modulation wave frequencies are different from each other, and the method comprises:

[0006] For any of the target water injection pumps, a first power is determined from a preset first mapping table according to the voltage modulation degree determined by the modulation wave frequency, wherein the first mapping table records a mapping relationship between optional powers and optional modulation degree intervals, and the first power corresponds to the first modulation degree interval;

[0007] Based on the plurality of target water injection pumps, a plurality of different candidate sets are obtained by permutation and combination, wherein the sum of the first powers corresponding to the candidate sets is not less than the first system power required by the offshore oil and gas system;

[0008] For any first water injection pump in the candidate set, updating the voltage modulation degree based on the minimum value of the first modulation degree interval, wherein the initial voltage modulation degree of the first water injection pump is greater than the minimum value of the first modulation degree interval;

[0009] Based on any of the target water injection pumps in any of the candidate sets, determining a target load, a target head and a target displacement from a preset second mapping table according to the voltage modulation degree, and determining a first power consumption based on the target load, the target head and the target displacement;

[0010] The candidate set with the smallest corresponding sum of the first power consumptions is determined as a target set, and the target water injection pump of the target set is started based on the corresponding voltage modulation degree.

[0011] According to some embodiments of the present invention, each of the target water injection pumps is preset with a rated power. After a plurality of different candidate sets are obtained by permutation and combination based on the plurality of target water injection pumps, the method further comprises:

[0012] Based on the plurality of target water injection pumps, a plurality of different optional sets are obtained by permutation and combination, and at least one substitute set is determined from the optional sets that do not belong to the candidate set, wherein the substitute set includes at least one second water injection pump, the first power of the second water injection pump is less than the rated power, and the sum of the rated powers corresponding to the substitute set is greater than or equal to the first system power;

[0013] Based on any of the second water injection pumps in any of the substitute sets, determining the difference between the rated power and the first power as an adjustable power value;

[0014] Based on any of the substitute sets, arrange the second water injection pumps in ascending order based on the adjustable power values, determine the sum of the current first powers of the substitute set as the first set power, adjust the first power of the second water injection pump ranked first to the corresponding rated power, and update the first set power;

[0015] When the updated first set power is greater than or equal to the first system power, the corresponding substitute set is determined as the candidate set; otherwise, the first power of the second water injection pump of the next position is continuously adjusted;

[0016] When the plurality of candidate sets include at least one pair of a first set and a second set, the second set is removed, wherein the first set is a subset of the second set.

[0017] According to some embodiments of the present invention, before adjusting the first power of the second water injection pump ranked first to the corresponding rated power, the method further includes:

[0018] Determine the optional power that is greater than the first power and adjacent to the first power in the first mapping table as the second power;

[0019] The first set power is updated based on the second power. When the updated first set power is greater than or equal to the first system power, the corresponding substitute set is determined as the candidate set, and the minimum value of the optional modulation degree range corresponding to the second power is determined as the voltage modulation degree of the corresponding target water injection pump.

[0020] According to some embodiments of the present invention, after starting the target water injection pump of the target set based on the corresponding voltage modulation degree, the method further includes:

[0021] determining the optional set other than the target set as a reference set;

[0022] Based on any of the reference sets, determining a reference load, a reference head and a reference displacement from the second mapping table according to the voltage modulation degree of each of the target water injection pumps, determining a second power consumption corresponding to each of the target water injection pumps based on the reference load, the reference head and the reference displacement, determining the sum of the corresponding first powers as the second set power, and determining the sum of the second power consumption as the reference power consumption;

[0023] Associating the reference set with the smallest reference power consumption with the corresponding second set power among the plurality of reference sets with the same second set power;

[0024] When the second system power is determined based on the power change information of the offshore oil and gas system, a new target set is determined from a plurality of the reference sets based on the second system power and each of the second set powers.

[0025] According to some embodiments of the present invention, after determining the candidate set corresponding to the smallest sum of the first power consumptions as the target set, the method further includes:

[0026] Determining at least one third water injection pump in the target set based on the first mapping table, wherein the first power corresponding to the third water injection pump is greater than the minimum optional power recorded in the first mapping table;

[0027] Determine a sum of the current first powers of the target set as a third set power;

[0028] Based on any of the third water injection pumps, the optional power that is less than the first power and adjacent to the first power in the first mapping table is determined as a third power, and when the third set power updated based on the third power is greater than or equal to the first system power, the third power of another third water injection pump is continued to be determined;

[0029] When each of the third water injection pumps has updated the third power once, the third aggregate power is greater than or equal to the first system power, and the third water injection pump is re-determined and then the new third power is continued to be determined one by one;

[0030] When the third aggregate power updated based on any of the third powers is less than the first system power, the third water injection pump updated this time is rolled back to the first power.

[0031] According to some embodiments of the present invention, the voltage modulation degree determined according to the modulation wave frequency includes:

[0032] Obtaining a preset carrier frequency, and determining the sum of the carrier frequency and the modulation wave frequency as the input frequency;

[0033] When the input frequency is less than or equal to a preset first frequency, determining a preset breakover voltage as a target output voltage;

[0034] Alternatively, when the input frequency is greater than or equal to a preset second frequency, the rated voltage of the target water injection pump is determined as the target output voltage, wherein the breakover voltage is less than the rated voltage;

[0035] Alternatively, when the input frequency is greater than the first frequency and less than the second frequency, the target output voltage is determined from a preset voltage-frequency curve based on the input frequency, wherein the voltage-frequency curve is used to indicate a positive correlation between frequency and voltage, and a vertical coordinate value of the voltage-frequency curve is between the breakover voltage and the rated voltage;

[0036] The ratio of the target output voltage to the rated voltage is determined as the voltage modulation degree.

[0037] According to some embodiments of the present invention, each of the target water injection pumps is provided with a DSP chip, an FPGA chip and a drive motor, the DSP chip is connected to the FPGA chip, the FPGA chip is connected to the drive motor, the DSP chip is preset with the voltage-frequency curve, and the target water injection pump of the target set is started based on the corresponding voltage modulation degree, including:

[0038] Based on any of the target water injection pumps, the modulation wave frequency and the carrier frequency are input into the DSP chip, so that the DSP chip determines the voltage modulation degree based on the voltage frequency curve;

[0039] The DSP chip converts the modulation wave frequency and the voltage modulation degree from decimal to hexadecimal and sends the converted data to the FPGA chip. The FPGA chip generates an SPWM signal based on the modulation wave frequency and the voltage modulation degree and sends the SPWM signal to the drive motor.

[0040] The driving motor starts to run based on the SPWM signal.

[0041] In a second aspect, an embodiment of the present invention provides an energy-saving control device for an offshore oil and gas system, comprising at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions executable by the at least one control processor, and the instructions are executed by the at least one control processor so that the at least one control processor can execute the energy-saving control method for the offshore oil and gas system as described in the first aspect above.

[0042] In a third aspect, an embodiment of the present invention provides an electronic device, comprising the energy-saving control device for an offshore oil and gas system as described in the second aspect above.

[0043] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the energy-saving control method for an offshore oil and gas system as described in the first aspect above.

[0044] According to the energy-saving control method of the offshore oil and gas system of the embodiment of the present invention, there are at least the following beneficial effects: for any of the target water injection pumps, according to the voltage modulation determined by the modulation wave frequency, the first power is determined from a preset first mapping table, wherein the first mapping table records the mapping relationship between the optional power and the optional modulation interval, and the first power corresponds to the first modulation interval; based on the plurality of the target water injection pumps, a plurality of different candidate sets are obtained by permutation and combination, wherein the sum of the first powers corresponding to the candidate sets is not less than the first system power required by the offshore oil and gas system; for any first water injection pump of the candidate set, the voltage modulation is updated based on the minimum value of the first modulation interval, wherein the initial voltage modulation of the first water injection pump is greater than the minimum value of the first modulation interval; based on any of the target water injection pumps of any of the candidate sets, the target load, target head and target displacement are determined from a preset second mapping table according to the voltage modulation, and the first power consumption is determined based on the target load, the target head and the target displacement; the candidate set with the smallest corresponding sum of the first power consumption is determined as the target set, and the target water injection pump of the target set is started based on the corresponding voltage modulation. According to the technical solution of the embodiment of the present invention, it is possible to determine the corresponding voltage modulation degree of each target water injection pump when the modulation wave frequency is pre-input, determine the first power that can be currently provided by looking up the table, and adjust the voltage modulation degree downward on the basis of maintaining the first power to reduce power consumption. The target set with the lowest power consumption is screened out according to the power demand of the offshore oil and gas system, and the start and stop status of each target water injection pump is automatically determined according to the target set, so as to improve control efficiency and reduce system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic diagram of an offshore oil and gas system provided by an embodiment of the present invention;

[0046] Figure 2 is a flow chart of an energy-saving control method for an offshore oil and gas system provided by another embodiment of the present invention;

[0047] Figure 3 is a schematic diagram of a voltage-frequency curve provided by another embodiment of the present invention;

[0048] Figure 4 is a complete flow chart of an energy-saving control method for an offshore oil and gas system provided by another embodiment of the present invention;

[0049] Figure 5 It is a structural diagram of an energy-saving control device for an offshore oil and gas system provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0053] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0054] The embodiment of the present invention provides an energy-saving control method, device, equipment, and storage medium for an offshore oil and gas system, wherein the energy-saving control method for an offshore oil and gas system comprises: for any of the target water injection pumps, determining a first power from a preset first mapping table according to the voltage modulation determined by the modulation wave frequency, wherein the first mapping table records a mapping relationship between optional powers and optional modulation intervals, and the first power corresponds to the first modulation interval; based on a plurality of the target water injection pumps, a plurality of different candidate sets are obtained by permutation and combination, wherein the sum of the first powers corresponding to the candidate sets is not less than the first system power required by the offshore oil and gas system; For any first water injection pump in the candidate set, the voltage modulation is updated based on the minimum value of the first modulation interval, wherein the initial voltage modulation of the first water injection pump is greater than the minimum value of the first modulation interval; for any target water injection pump in the candidate set, the target load, target head and target displacement are determined from a preset second mapping table according to the voltage modulation, and the first power consumption is determined based on the target load, the target head and the target displacement; the candidate set with the smallest sum of the corresponding first power consumption is determined as the target set, and the target water injection pump in the target set is started based on the corresponding voltage modulation. According to the technical solution of the embodiment of the present invention, the voltage modulation corresponding to each target water injection pump can be determined when the modulation wave frequency is input in advance, the first power currently available is determined by looking up the table, and the voltage modulation is lowered on the basis of maintaining the first power to reduce power consumption, the target set with the lowest power consumption is screened out according to the power demand of the offshore oil and gas system, and the start and stop status of each target water injection pump is automatically determined according to the target set, so as to improve control efficiency and reduce system energy consumption.

[0055] First, refer to Figure 1 , Figure 1 A schematic diagram of an offshore oil and gas system provided in an embodiment of the present invention, wherein the offshore oil and gas system of this embodiment includes multiple target water injection pumps, each of which is preset with a modulation wave frequency, and the values ​​of at least two modulation wave frequencies are different from each other; each target water injection pump is preset with a rated power, and each target water injection pump is provided with a digital signal processing (Digital Signal Process, DSP) chip, an FPGA chip and a drive motor, the DSP chip is connected to the FPGA chip, the FPGA chip is connected to the drive motor, and the DSP chip is preset with a voltage-frequency curve.

[0056] It should be noted that if Figure 1 As shown, the control method of this embodiment can be executed by the server 10 of the offshore oil and gas system. The server 10 is in communication connection with each target water injection pump. The number of target water injection pumps in this embodiment is multiple, such as Figure 1The five target water injection pumps shown include a first pump 21, a second pump 22, a third pump 23, a fourth pump 24 and a fifth pump 25 in sequence. Each target water injection pump can be a water injection pump of the same model, or different models can be flexibly selected according to actual needs, for example Figure 1 The first pump 21, the third pump 23 and the fifth pump 25 are water injection pumps of the same model, the second pump 22 and the fourth pump 24 are water injection pumps of the same model, and the first pump 21 and the second pump 22 are of different models, which will not be limited here.

[0057] It should be noted that the modulation wave frequency of each target water injection pump can be set according to actual needs. The present embodiment includes at least two different modulation wave frequencies. For example, modulation wave frequencies with different values ​​can be set for two target water injection pumps of the same model, so that the power and power consumption provided by the two target water injection pumps are different, so that the power parameters and power consumption parameters of the multiple candidate combinations subsequently combined are different, so as to avoid the power that can be achieved by the offshore oil and gas system being an integer multiple of the power of a single target water injection pump. The differentiated numerical power can better match the candidate sets with different output capabilities.

[0058] It should be noted that the rated power is a standard parameter of the target water injection pump, which will not be elaborated here and can be pre-set in the server 10.

[0059] It should be noted that the target water injection pump is set with a DSP chip for parameter setting. The modulation wave frequency of this embodiment may be adjusted by the server 10. Therefore, this embodiment does not directly write the unmodifiable modulation wave frequency into the DSP chip. Instead, after the target set is determined by the technical solution of this embodiment, the down-adjusted modulation wave frequency is written into the DSP chip. The DSP chip can output a digital signal (the modulation wave frequency and voltage modulation degree in this embodiment) to the FPGA chip, so that the FPGA chip generates a sinusoidal pulse width modulation (SPWM) signal for controlling the drive motor. The drive motor is started under the control of the SPWM signal to reach the first power, thereby realizing water injection. The specific control principle and the principle of generating the SPWM signal based on the voltage modulation degree and the modulation wave frequency are technologies well known to those skilled in the art and will not be elaborated here.

[0060] The following is based on the Figure 1 The offshore oil and gas system shown is used to further illustrate the technical solution of the embodiment of the present invention.

[0061] Reference Figure 2 , Figure 2 This is a flow chart of an energy-saving control method for an offshore oil and gas system provided by an embodiment of the present invention. The energy-saving control method for an offshore oil and gas system includes but is not limited to the following steps:

[0062] S10, for any target water injection pump, according to the voltage modulation determined by the modulation wave frequency, determine the first power from a preset first mapping table, wherein the first mapping table records a mapping relationship between optional powers and optional modulation intervals, and the first power corresponds to the first modulation interval;

[0063] S20, obtaining a plurality of different candidate sets by permutation and combination based on the plurality of target water injection pumps, wherein the sum of the first powers corresponding to the candidate sets is not less than the first system power required by the offshore oil and gas system;

[0064] S30, for any first water injection pump in the candidate set, updating the voltage modulation degree based on the minimum value of the first modulation degree interval, wherein the initial voltage modulation degree of the first water injection pump is greater than the minimum value of the first modulation degree interval;

[0065] S40, based on any target water injection pump in any candidate set, determining a target load, a target head and a target displacement from a preset second mapping table according to the voltage modulation degree, and determining a first power consumption based on the target load, the target head and the target displacement;

[0066] S50, determining a candidate set with the smallest corresponding sum of first power consumption as a target set, and starting a target water injection pump of the target set based on the corresponding voltage modulation degree.

[0067] It should be noted that the voltage modulation index is a definition well known to those skilled in the art. The voltage modulation index of this embodiment is the ratio of the output power of the target water injection pump to the rated power. The voltage modulation index can characterize the output capacity of the target water injection pump. The greater the voltage modulation index, the greater the power of the target water injection pump and the stronger the working capacity. Figure 1 The modulation wave frequency of each target water injection pump is set in the server shown. Since the parameters of the drive motor are known, the corresponding voltage modulation degree can be determined according to the modulation wave frequency. The specific principle will not be elaborated here.

[0068] It should be noted that, before installing the target water injection pump, the output power of the target water injection pump under different voltage modulations is pre-tested in this embodiment, so as to construct a first mapping table. Considering that the target water injection pump has certain losses during operation, the displacement and head that can be achieved under different powers are not necessarily the same. Therefore, the voltage modulation and output power are not necessarily linearly related. It is likely that the output power is relatively close under different voltage modulations. Therefore, in the first mapping table of this embodiment, each optional power corresponds to an optional modulation interval, and one optional power corresponds to at least one optional modulation. Of course, the optional modulation interval can also include only one value, which is not limited here. After determining the target modulation of each target water injection pump, this embodiment looks up the corresponding first power in the first mapping table, and determines the optional modulation interval where the voltage modulation is located in the first mapping table as the first modulation interval.

[0069] For example, Figure 1 Taking the first pump 21 shown as an example, after determining that the value of the voltage modulation degree is B1, a lookup is performed in the first mapping table based on the value B1. Taking one of the optional modulation degree intervals as [B1', B1''] as an example, the corresponding value of the first power is C1. If B1'≤B1≤B1'' is satisfied, the value of the first power of the first pump 21 is determined to be C1.

[0070] It should be noted that after determining the first power of each target water injection pump, this embodiment constructs multiple optional sets by exhaustive permutations and combinations, and the composition of each optional set is different. For example, the number of target water injection pumps included in the two optional sets is different, or when the number of target water injection pumps is the same, the two optional sets include at least one different target water injection pump. When determining the first power, this embodiment selects the candidate power from multiple optional sets whose sum of the first power is greater than or equal to the first system power. The first system power is the operating power provided by multiple target water injection pumps required by the offshore oil and gas system, and the specific value can be set according to specific mining needs.

[0071] For example, Figure 1 As shown, after determining each first power, the constructed optional set may include [first pump 21, second pump 22], [first pump 21, second pump 22, third pump 23], [second pump 22, third pump 23, fifth pump 25], [first pump 21, second pump 22, third pump 23] and [second pump 22, third pump 23, fifth pump 25], although the two candidate sets of [first pump 21, second pump 22, third pump 23] and [second pump 22, third pump 23, fifth pump 25] have the same number, but the former candidate set does not include the fifth pump 25, and the latter candidate set does not include the first pump 21, and therefore can be determined as two candidate sets.

[0072] It should be noted that the sum of the first powers of the candidate sets selected in this embodiment is greater than or equal to the first system power. However, the greater the power is not necessarily the greater the power consumption. The power of the injection pump is determined by the load, head, and displacement. The voltage modulation factor can be used to determine the load. Therefore, after determining multiple candidate sets in this embodiment, the candidate set with the minimum sum of the first powers cannot be used as the target set. The sum of the first powers is only used to determine whether the candidate set can meet the first system power, rather than being used as a direct basis for judging power consumption.

[0073] It should be noted that after determining the candidate set, according to the description of the above embodiment, each optional power can correspond to an optional modulation factor range, that is, different voltage modulation factors within this range can correspond to the same output power. And the lower the voltage modulation factor, the lower the corresponding load, resulting in lower power consumption. In this embodiment, not all target injection pumps perform the same adjustment operation. If the voltage modulation factor corresponding to the target injection pump is already the minimum value of the first modulation factor range, there is no room for adjustment. Based on this, this embodiment first screens out the first injection pump. The voltage modulation factor of the first injection pump is greater than the minimum value of the first modulation factor range, that is, the first injection pump has the basis for lowering the voltage modulation factor while maintaining the first power. After determining the first injection pump, the voltage modulation factor can be directly lowered to the minimum value of the first modulation factor range.

[0074] Exemplarily, taking the above [B1’, B1’’] as the first modulation factor range as an example, if the value B of the voltage modulation factor of the first pump 21 satisfies B1’ < B1 ≤ B1’’, then the voltage modulation factor is lowered to B1’.

[0075] It should be noted that after lowering the voltage modulation factor of the first injection pump in the candidate set, the second mapping table can be queried according to the voltage modulation factor to determine the corresponding target load, target head, and target displacement. The second mapping table is the same as the first mapping table. Before the target injection pump is put into use, the corresponding optional load, optional head, and optional displacement can be tested by configuring different voltage modulation factors. The displacement refers to the quantity of liquid transported by the water pump per unit time, and the head refers to the height of the resistance that the liquid needs to overcome from the inlet to the outlet of the injection pump, that is, the ability of the water pump to transport the liquid from a low place to a high place. Displacement and head are a pair of mutually restrictive parameters. Generally speaking, the greater the displacement, the smaller the head; vice versa. However, this is not a simple linear relationship, but a process of dynamic balance adjustment. Therefore, it is necessary to obtain the second mapping table through testing and then look up the corresponding data. Usually, when the head increases, the load that the motor needs to bear will also increase accordingly. This is because increasing the head requires overcoming a greater difference in liquid gravitational potential energy. The same applies to displacement, which will not be elaborated here.

[0076] It should be noted that, in this embodiment, after determining the target load, target head and target displacement, conversion coefficients can be preset for the load, head and displacement respectively. The calculation formula for the first power consumption in this embodiment is: , the sum of the first power consumption of the candidate set is: ,in, is the sum of the first power consumption of the candidate set, N is the number of target water injection pumps in the candidate set, It is used to indicate the start and stop status of the i-th target water injection pump. , when the i-th target water injection pump stops , is the target load of the i-th target water injection pump, b is the preset load conversion coefficient (used to characterize the impact of load on energy consumption), is the target head of the ith target water injection pump, c is the preset head conversion coefficient (used to characterize the impact of head on energy consumption), is the target displacement of the ith target water injection pump, and d is the preset displacement conversion coefficient (used to characterize the impact of displacement on energy consumption). When calculating F, the target water injection pump recorded in the candidate set can be Set to 1 to exclude the target water injection pump Set to 0,

[0077] It should be noted that after determining F, the candidate set corresponding to the minimum value of F is taken as the target set, and each target water injection pump recorded in the target set is set to the start state, and the target water injection pump that does not belong to the target set is set to the stop state, thereby determining the start and stop states of all target water injection pumps, and for the target water injection pump in the start state, the voltage modulation index and modulation index frequency are also determined. It only needs to run according to the above parameters to meet the first system power, which can be automatically calculated by the server without manual setting. This improves the intelligent control of each target water injection pump under different power requirements of the offshore oil and gas system, and ensures that the planned control scheme of the target water injection pump can minimize energy consumption and reduce the energy consumption of the offshore oil and gas system.

[0078] In addition, in one embodiment, referring to Figure 4 After executing step S20, the following steps are also included but not limited to:

[0079] S21, based on the plurality of target water injection pumps, a plurality of different optional sets are obtained by permutation and combination, and at least one substitute set is determined from the optional sets that do not belong to the candidate set, wherein the substitute set includes at least one second water injection pump, the first power of the second water injection pump is less than the rated power, and the sum of the rated powers corresponding to the substitute set is greater than or equal to the first system power;

[0080] S22, based on any second water injection pump of any substitute set, determining the difference between the rated power and the first power as an adjustable power value;

[0081] S23, based on any substitute set, arrange the second water injection pumps in ascending order based on the adjustable power value, determine the sum of the current first powers of the substitute set as the first set power, adjust the first power of the second water injection pump ranked first to the corresponding rated power, and update the first set power;

[0082] S24, when the updated first set power is greater than or equal to the first system power, the corresponding substitute set is determined as the candidate set, otherwise, the first power of the next second water injection pump is continuously adjusted;

[0083] S25: When the multiple candidate sets include at least one pair of a first set and a second set, remove the second set, wherein the first set is a subset of the second set.

[0084] It should be noted that when determining the candidate set, the target water injection pumps are first arranged and combined to obtain multiple optional sets, and then the candidate set is screened out from the optional set based on the sum of the first powers. The first power is obtained by looking up the table based on the voltage modulation index determined by the modulation wave frequency. If the modulation wave frequency is modified so that the operating parameters of the target water injection pump are changed, the corresponding first power may also be further improved, so that the optional set that originally does not meet the conditions can be determined as a candidate set. Based on this, this embodiment determines the optional set that is not determined as a candidate set as a substitute set, and determines the target water injection pump whose first power is less than the rated power in the substitute set as the second water injection pump. If all the first powers of the optional set are already rated powers, there is no basis for power increase, and it will not be determined as a substitute set.

[0085] It should be noted that after determining the second water injection pump, if the same substitute set includes multiple second water injection pumps, the rated power is first subtracted from the first power to obtain the adjustable power value, and the adjustable power value is used to characterize the adjustable power range. According to the description of the above embodiment, the power adjustment is mainly achieved by adjusting the modulation wave frequency. Therefore, the larger the power increase range, the larger the adjustment range of the modulation wave frequency, and the greater the power consumption increase. In order to minimize the power consumption of the candidate set, this embodiment sorts the second water injection pumps from small to large according to the adjustable power value, and gives priority to adjusting the second water injection pumps with smaller adjustment ranges to avoid a rapid increase in power consumption.

[0086] It should be noted that after each power adjustment is completed, it is necessary to determine whether the first system power is met. Therefore, this embodiment first calculates the current first set power, first increases the first power of the second water injection pump in the first position to the rated power, and updates the first set power, that is, adds the adjustable power value of the second water injection pump in the first position to the first set power. If the adjusted first set power is greater than or equal to the first system power, the power can be increased to make the substitute set meet the demand and it can be determined as a candidate set. Otherwise, continue to adjust the first power of the second water injection pump in the second position, and so on. It is sufficient to perform a judgment each time an adjustment is made.

[0087] It should be noted that according to the scheme of the above embodiment, multiple candidate sets can be determined. On this basis, if one candidate set is a subset of another candidate set, this embodiment is defined as the first set and the second set, and the first set is a subset of the second set. Since it can be determined that both the first set and the second set can meet the first system power, and since the second set has at least one more target water injection pump than the first set, it can be determined that the first power consumption of the second set must be greater than that of the first set. There is no need to calculate and compare the power consumption of the first set and the second set, and the second set can be directly removed. By screening the candidate sets, it can be ensured that the remaining candidate sets correspond to optional combination schemes of different target water injection pumps, respectively, and the efficiency of subsequent determination of the target set is improved.

[0088] For example, Figure 1 As shown, taking the first set of [first pump 21, second pump 22] as an example and the second set of [first pump 21, second pump 22, third pump 23] as an example, the power consumption of the first pump 21 and the second pump 22 will be respectively included in the first power consumption of the first set and the second set, and the first power consumption of the second set at least further includes the first power consumption of the third pump 23, then the second set will be removed and not used for the subsequent determination of the target set.

[0089] In addition, in one embodiment, referring to Figure 4 In step S23, before adjusting the first power of the second water injection pump ranked first to the corresponding rated power, the following steps are also included but not limited to:

[0090] S231, determining an optional power that is greater than the first power and adjacent to the first power in the first mapping table as a second power;

[0091] S232, update the first set power based on the second power, when the updated first set power is greater than or equal to the first system power, determine the corresponding substitute set as the candidate set, and determine the minimum value of the optional modulation range corresponding to the second power as the voltage modulation of the corresponding target water injection pump.

[0092] It should be noted that, according to the description of the above embodiment, the substitute set can be determined as the candidate set by adjusting the power, while in the above embodiment the first power is directly adjusted to the rated power. This embodiment uses multiple optional powers recorded in the first mapping table to make multiple adjustments for each second water injection pump, and the power of the second water injection pump is adjusted by one level according to the first mapping table, and the optional power that is only greater than the first power is determined as the second power. After the second power is applied, if the conditions are met, the minimum value of the optional modulation range of the second power is determined as the voltage modulation. This not only realizes power adjustment, but also can directly determine the voltage modulation degree corresponding to the second water injection pump under the optimal energy consumption, thereby improving the adjustment efficiency.

[0093] It should be noted that when the first system power is still not met after one adjustment, the above steps can be further repeated, and the optional power in the first mapping table that is only greater than the second power can be applied, and so on, until the rated power is traversed and the next second water injection pump is switched to perform the same operation.

[0094] It should be noted that, in both the present embodiment and the above-mentioned embodiments, after adjusting a second water injection pump to the rated power, switching to the next second water injection pump occurs when the updated first collective power still does not meet the first system power. This is because the control efficiency of parameter adjustment for a second water injection pump is better than that of parameter adjustment for multiple second water injection pumps, thereby minimizing the number of second water injection pumps to be adjusted and improving control efficiency.

[0095] In addition, in one embodiment, referring to Figure 4 After executing step S50, the following steps are also included but not limited to:

[0096] S511, determining an optional set other than the target set as a reference set;

[0097] S512, based on any reference set, determining a reference load, a reference head, and a reference displacement from a second mapping table according to the voltage modulation degree of each target water injection pump, determining a second power consumption corresponding to each target water injection pump based on the reference load, the reference head, and the reference displacement, determining the sum of the corresponding first powers as the second set power, and determining the sum of the second power consumption as the reference power consumption;

[0098] S513, associating a reference set with the smallest reference power consumption with the corresponding second set power among multiple reference sets with the same second set power;

[0099] S514, when the second system power is determined based on the power change information of the offshore oil and gas system, a new target set is determined from a plurality of reference sets based on the second system power and each second set power.

[0100] It should be noted that after determining the target set, the start / stop status and control parameters of each target water injection pump are determined based on the target set, and the power demand of the offshore oil and gas system may change. If all the steps of this embodiment are re-executed each time a new system power is determined, it will consume more computing resources and response time. In order to improve the response efficiency when switching power requirements, this embodiment determines the optional sets other than the target set as reference sets, and determines the power demand corresponding to each reference set. After obtaining the power change information and determining the second system power, the target set corresponding to the second system power can be directly obtained, and the start / stop control and parameter adjustment of the target water injection pump can be directly performed to improve the response efficiency.

[0101] It should be noted that, in this embodiment, based on each reference set, the reference load, reference head and reference displacement are obtained by looking up the table according to the voltage modulation degree with reference to the principle of the above target set, and the reference power of each reference set is calculated with reference to the above formula for calculating F. Of course, since the specific second system power is not determined in this process, it is not necessary to perform the operations of the above first set and second set, and it is sufficient to determine the reference power consumption of each reference set.

[0102] It should be noted that this embodiment is to determine the optimal power consumption combination of the target water injection pump under different system powers. Therefore, if there are multiple reference sets with the same second set power, then under the same system power requirement, the reference set with the smallest power consumption will be selected and associated with the corresponding second set power. After determining the new second system power, the reference set associated with the second set power that matches the second system power is directly determined as the new target set, which can eliminate repeated calculations and improve response efficiency.

[0103] It should be noted that if the modulation wave frequency of each target water injection pump is modified in the server, the above reference set is no longer applicable, and the steps of the above embodiment need to be repeated to determine the target set, which will not be repeated here.

[0104] In addition, in one embodiment, referring to Figure 4 After executing step S50, the following steps are also included but not limited to:

[0105] S521, determining at least one third water injection pump in the target set based on the first mapping table, wherein a first power corresponding to the third water injection pump is greater than a minimum optional power recorded in the first mapping table;

[0106] S522, determining the sum of the current first powers of the target set as the third set power;

[0107] S523, based on any third water injection pump, determining the optional power that is less than the first power and adjacent to the first power in the first mapping table as the third power, and when the third set power updated based on the third power is greater than or equal to the first system power, continue to determine the third power of another third water injection pump;

[0108] S524, when each third water injection pump has updated the third power once, the third aggregate power is greater than or equal to the first system power, and the third water injection pump is re-determined and then the new third power is continued to be determined one by one;

[0109] S525: When the third set power updated based on any third power is less than the first system power, the third water injection pump updated this time is rolled back to the first power.

[0110] It should be noted that the target set of this embodiment is a candidate set that meets the first system power and has the lowest power consumption. After determining the target set, the target water injection pump that can adjust the power down according to the first mapping table is further determined to be the third water injection pump, that is, the first power of the third water injection pump is not the smallest optional power in the first mapping table. Unlike the maximum value of the upward adjustment, which is the rated power, the minimum value during downward adjustment is 0, and when the power is reduced to 0, the corresponding target water injection pump is actually not started, which makes the target set become its subset. According to the description of the above embodiment, the target set is obtained after subset screening, so any target water injection pump shut down will inevitably fail to meet the first system power. Therefore, the minimum adjustable power value of each target water injection pump in this embodiment is the minimum optional power recorded in the first mapping table.

[0111] It should be noted that after determining the third water injection pump, refer to the adjustment principle of the second water injection pump mentioned above. The difference is that the third water injection pump selects the adjacent third power downward in the first mapping table. If the power of a third water injection pump can still meet the first system power after reducing the power, continue to reduce the third power of the next third water injection pump. On the basis of meeting the first system power, the power of the third water injection pumps is reduced one by one, thereby achieving a further reduction in power consumption.

[0112] It should be noted that after each third water injection pump has completed a down-regulation, if the third power set is still greater than the first system power, the next round of down-regulation can be continued. At this time, the third water injection pump needs to be re-determined to avoid down-regulating the power of the target water injection pump that has reached the minimum optional power in the first mapping table.

[0113] It should be noted that when the third powers of all third water injection pumps are adjusted to the minimum value recorded in the first mapping table, stop adjusting further and control the operation of the target water injection pump with the current operating parameters. When the third aggregate power is less than the first system power after adjusting a third power, the minimum power that satisfies the first system power has been reached. In this embodiment, the power before adjustment is recorded as the new first power, so it can be rolled back to the first power obtained last time, that is, the reduction of the third power this time can be abandoned, and the value after the last adjustment can be retained to ensure that the third aggregate power satisfies the first system power.

[0114] In addition, in one embodiment, referring to Figure 4 In step S10, the voltage modulation degree is determined according to the modulation wave frequency, including but not limited to the following steps:

[0115] S11, obtaining a preset carrier frequency, and determining the sum of the carrier frequency and the modulation wave frequency as the input frequency;

[0116] S12, when the input frequency is less than or equal to a preset first frequency, determining a preset breakover voltage as a target output voltage;

[0117] S13, when the input frequency is greater than or equal to a preset second frequency, determining the rated voltage of the target water injection pump as the target output voltage, wherein the breakover voltage is less than the rated voltage;

[0118] S14, when the input frequency is greater than the first frequency and less than the second frequency, determining the target output voltage from a preset voltage-frequency curve based on the input frequency, wherein the voltage-frequency curve is used to indicate a positive correlation between frequency and voltage, and a vertical coordinate value of the voltage-frequency curve is between the breakover voltage and the rated voltage;

[0119] S15, determining the ratio of the target output voltage to the rated voltage as the voltage modulation degree.

[0120] It should be noted that according to the description of the above embodiment, the target water injection pump is driven by a drive motor. Therefore, after determining the modulation wave frequency, it is also necessary to obtain the preset carrier frequency, and superimpose the carrier frequency on the modulation wave frequency to obtain the input frequency. The input frequency is the frequency input to the DSP chip, so that the DSP chip can perform subsequent control of the drive motor.

[0121] It should be noted that if Figure 3 As shown, the voltage-frequency curve of this embodiment is a segmented curve. When the horizontal axis is less than the first frequency, the output voltage is a constant turning voltage. When the horizontal axis is greater than the second frequency, the output voltage is a constant rated voltage. When the horizontal axis is between the first frequency and the second frequency, the output voltage is positively correlated with the input frequency. Figure 4 It is represented by a simple straight line relationship.

[0122] It should be noted that, based on the above voltage-frequency curve, this embodiment first determines the value of the input frequency, and determines the breakover voltage as the target output voltage when it is less than or equal to the first frequency, and determines the target output voltage as the rated voltage when it is greater than or equal to the second frequency. When the input frequency is between the first frequency and the second frequency, the input frequency is input into the expression of the voltage-frequency curve to calculate the target output voltage, and the specific expression can be set according to actual needs, and no limitation is made here.

[0123] It should be noted that after determining the target output voltage, this embodiment determines the ratio of the target output voltage to the rated voltage as the voltage modulation index, so that the voltage modulation index can represent the ratio of the output power of the target water injection pump to the rated power.

[0124] In addition, in one embodiment, referring to Figure 4 Step S50 specifically includes but is not limited to the following steps:

[0125] S531, based on any target water injection pump, input the modulation wave frequency and the carrier frequency into the DSP chip, so that the DSP chip determines the voltage modulation degree based on the voltage frequency curve;

[0126] S532, the DSP chip converts the modulation wave frequency and the voltage modulation degree from decimal to hexadecimal and sends the converted data to the FPGA chip. The FPGA chip generates an SPWM signal based on the modulation wave frequency and the voltage modulation degree and sends the SPWM signal to the drive motor.

[0127] S533, the driving motor starts running based on the SPWM signal.

[0128] It should be noted that after determining the target set, since the voltage modulation index is set in the server and is used to determine the target set, the DPS chip cannot use the voltage modulation index as a direct input. In this embodiment, the modulation wave frequency and the carrier frequency are input into the DSP chip. The DSP chip inverts the voltage modulation index based on the voltage frequency curve of the threshold. The DSP chip is used to generate a control signal. The final control of the drive motor still depends on the FPGA chip. Therefore, the basic data of the drive motor control (modulation wave frequency and voltage modulation index) needs to be sent to the FPGA chip. Since the DSP chip is in decimal and the FPGA is in hexadecimal, a base conversion is first performed through the DSP chip. The specific conversion principle is a technology well known to those skilled in the art and will not be repeated here.

[0129] It should be noted that after the FPGA chip obtains the hexadecimal modulation wave frequency and voltage modulation index, the built-in SPWM generator is used to generate an SPWM signal, and the drive motor is controlled by the SPWM signal. Since the SPWM signal is modulated based on the modulation wave frequency and voltage modulation index, it can ensure that the output power of the drive motor is the first power.

[0130] like Figure 5 As shown, Figure 5 : is a structural diagram of an energy-saving control device for an offshore oil and gas system provided by an embodiment of the present invention. The present invention also provides an energy-saving control device for an offshore oil and gas system, comprising:

[0131] The processor 401 may be implemented by a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0132] The memory 402 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 402 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 402, and the processor 401 calls and executes the energy-saving control method of the offshore oil and gas system in the embodiment of this application;

[0133] Input / output interface 403, used to implement information input and output;

[0134] Communication interface 404, used to realize communication interaction between the device and other devices, which can be realized through wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.);

[0135] A bus 405 that transmits information between various components of the device (e.g., processor 401, memory 402, input / output interface 403, and communication interface 404);

[0136] The processor 401 , the memory 402 , the input / output interface 403 and the communication interface 404 are connected to each other in communication within the device via the bus 405 .

[0137] An embodiment of the present application also provides an electronic device, including the energy-saving control device for an offshore oil and gas system as described above.

[0138] An embodiment of the present application further provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the energy-saving control method of the offshore oil and gas system is implemented.

[0139] As a non-transient computer-readable storage medium, the memory can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and are implemented to be located in one place, or may also be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0140] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0141] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions under the shared conditions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An energy-saving control method for an offshore oil and gas system, characterized in that: The offshore oil and gas system includes a plurality of target water injection pumps, each of which is preset with a modulation wave frequency, and the values ​​of at least two of the modulation wave frequencies are different from each other. The method includes: For any of the target water injection pumps, a first power is determined from a preset first mapping table according to the voltage modulation degree determined by the modulation wave frequency, wherein the first mapping table records a mapping relationship between optional powers and optional modulation degree intervals, and the first power corresponds to the first modulation degree interval; Based on the plurality of target water injection pumps, a plurality of different candidate sets are obtained by permutation and combination, wherein the sum of the first powers corresponding to the candidate sets is not less than the first system power required by the offshore oil and gas system; For any first water injection pump in the candidate set, updating the voltage modulation degree based on the minimum value of the first modulation degree interval, wherein the initial voltage modulation degree of the first water injection pump is greater than the minimum value of the first modulation degree interval; Based on any of the target water injection pumps in any of the candidate sets, determining a target load, a target head and a target displacement from a preset second mapping table according to the voltage modulation degree, and determining a first power consumption based on the target load, the target head and the target displacement; Determine the candidate set with the smallest corresponding sum of the first power consumption as a target set, and start the target water injection pump of the target set based on the corresponding voltage modulation degree; Each of the target water injection pumps is preset with a rated power. After a plurality of different candidate sets are obtained by permutation and combination based on the plurality of target water injection pumps, the method further comprises: Based on the plurality of target water injection pumps, a plurality of different optional sets are obtained by permutation and combination, and at least one substitute set is determined from the optional sets that do not belong to the candidate set, wherein the substitute set includes at least one second water injection pump, the first power of the second water injection pump is less than the rated power, and the sum of the rated powers corresponding to the substitute set is greater than or equal to the first system power; Based on any of the second water injection pumps in any of the substitute sets, determining the difference between the rated power and the first power as an adjustable power value; Based on any of the substitute sets, arrange the second water injection pumps in ascending order based on the adjustable power values, determine the sum of the current first powers of the substitute set as the first set power, adjust the first power of the second water injection pump ranked first to the corresponding rated power, and update the first set power; When the updated first set power is greater than or equal to the first system power, the corresponding substitute set is determined as the candidate set; otherwise, the first power of the second water injection pump of the next position is continuously adjusted; When the plurality of candidate sets include at least one pair of a first set and a second set, the second set is removed, wherein the first set is a subset of the second set.

2. The energy-saving control method for offshore oil and gas systems according to claim 1, characterized in that: Before adjusting the first power of the second water injection pump ranked first to the corresponding rated power, the method further includes: Determine the optional power that is greater than the first power and adjacent to the first power in the first mapping table as the second power; The first set power is updated based on the second power. When the updated first set power is greater than or equal to the first system power, the corresponding substitute set is determined as the candidate set, and the minimum value of the optional modulation degree range corresponding to the second power is determined as the voltage modulation degree of the corresponding target water injection pump.

3. The energy-saving control method for offshore oil and gas systems according to claim 2, characterized in that: After starting the target water injection pump of the target set based on the corresponding voltage modulation degree, the method further includes: determining the optional set other than the target set as a reference set; Based on any of the reference sets, determining a reference load, a reference head and a reference displacement from the second mapping table according to the voltage modulation degree of each of the target water injection pumps, determining a second power consumption corresponding to each of the target water injection pumps based on the reference load, the reference head and the reference displacement, determining the sum of the corresponding first powers as the second set power, and determining the sum of the second power consumption as the reference power consumption; Associating the reference set with the smallest reference power consumption with the corresponding second set power among the plurality of reference sets with the same second set power; When the second system power is determined based on the power change information of the offshore oil and gas system, a new target set is determined from a plurality of the reference sets based on the second system power and each of the second set powers.

4. The energy-saving control method for offshore oil and gas systems according to claim 1, characterized in that: After determining the candidate set corresponding to the smallest sum of the first power consumptions as a target set, the method further includes: Determining at least one third water injection pump in the target set based on the first mapping table, wherein the first power corresponding to the third water injection pump is greater than the minimum optional power recorded in the first mapping table; Determine the sum of the current first powers of the target set as a third set power; Based on any of the third water injection pumps, the optional power that is less than the first power and adjacent to the first power in the first mapping table is determined as a third power, and when the third set power updated based on the third power is greater than or equal to the first system power, the third power of another third water injection pump is continued to be determined; When each of the third water injection pumps has updated the third power once, the third aggregate power is greater than or equal to the first system power, and the third water injection pump is re-determined and then the new third power is continued to be determined one by one; When the third aggregate power updated based on any of the third powers is less than the first system power, the third water injection pump updated this time is rolled back to the first power.

5. The energy-saving control method for offshore oil and gas systems according to claim 1, characterized in that: The voltage modulation degree determined according to the modulation wave frequency includes: Obtaining a preset carrier frequency, and determining the sum of the carrier frequency and the modulation wave frequency as the input frequency; When the input frequency is less than or equal to a preset first frequency, determining a preset breakover voltage as a target output voltage; Alternatively, when the input frequency is greater than or equal to a preset second frequency, the rated voltage of the target water injection pump is determined as the target output voltage, wherein the breakover voltage is less than the rated voltage; Alternatively, when the input frequency is greater than the first frequency and less than the second frequency, the target output voltage is determined from a preset voltage-frequency curve based on the input frequency, wherein the voltage-frequency curve is used to indicate a positive correlation between frequency and voltage, and a vertical coordinate value of the voltage-frequency curve is between the breakover voltage and the rated voltage; The ratio of the target output voltage to the rated voltage is determined as the voltage modulation degree.

6. The energy-saving control method for offshore oil and gas systems according to claim 5, characterized in that: Each of the target water injection pumps is provided with a DSP chip, an FPGA chip and a drive motor, the DSP chip is connected to the FPGA chip, the FPGA chip is connected to the drive motor, the DSP chip is preset with the voltage frequency curve, and the target water injection pump of the target set is started based on the corresponding voltage modulation degree, including: Based on any of the target water injection pumps, the modulation wave frequency and the carrier frequency are input into the DSP chip, so that the DSP chip determines the voltage modulation degree based on the voltage frequency curve; The DSP chip converts the modulation wave frequency and the voltage modulation degree from decimal to hexadecimal and sends the converted data to the FPGA chip. The FPGA chip generates an SPWM signal based on the modulation wave frequency and the voltage modulation degree and sends the SPWM signal to the drive motor. The driving motor starts to run based on the SPWM signal.

7. An energy-saving control device for an offshore oil and gas system, characterized in that: It includes at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions that can be executed by the at least one control processor, and the instructions are executed by the at least one control processor so that the at least one control processor can execute the energy-saving control method for an offshore oil and gas system as described in any one of claims 1 to 6.

8. An electronic device, characterized in that: Including the energy-saving control device for an offshore oil and gas system as described in claim 7.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the energy-saving control method for an offshore oil and gas system according to any one of claims 1 to 6.

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