Offshore oil and gas field power grid frequency variation determination method suitable for wind power integration

Abstract

The invention provides an offshore oil and gas field power grid frequency variation determination method suitable for wind power integration, and relates to the technical field of micro-grids, and the method comprises the steps: determining equivalent parameters of a power generation system according to the start-stop state of each generator set in the power generation system of an offshore oil and gas field power grid, the equivalent parameters comprise a speed regulator proportionality coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; acquiring wind power output change information in the offshore oil and gas field power grid, wherein the wind power output change information reflects the wind power output change condition accessed to the offshore oil and gas field power grid; and determining the output frequency variation of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters. According to the method, the frequency variation of the offshore oil and gas field power grid with wind power added can be calculated.

Description

Technical Field

[0001] The present invention relates to the field of microgrids, and in particular to a method for determining frequency variation of offshore oil and gas field power grids suitable for wind power access. Background Art

[0002] Offshore oil and gas fields are production, gathering and transportation systems that integrate offshore oil and gas production, gathering and transportation. Gas or oil generators are usually configured on multiple platforms for energy supply. After wind power is connected to the grid, the offshore oil and gas field becomes an offshore platform group energy system that is mainly powered by wind, gas and oil and is operated in coordination with offshore wind power and gas / oil turbine generators. Excess oil and gas are transported by ship or pipeline through oil pumps and compressors.

[0003] Offshore wind power has a natural uncertainty. After offshore wind power is connected to the grid, turbine generator sets become the only power source to smooth out the uncertainty of wind power. In the off-grid operation mode, the energy system of the offshore platform group that is synergistically powered by offshore wind power achieves energy self-sufficiency through offshore wind power and turbine generator sets. During the off-grid period of offshore wind power, it mainly relies on turbine generator sets to consume self-produced natural gas and crude oil to supply electricity. During the peak period of offshore wind power, turbine generator sets will reduce their output to ensure the maximum consumption level of offshore wind power. When the offshore oil and gas field power grid connected to wind power operates normally, the daily energy demand of the offshore oil and gas field has almost no significant fluctuations. Therefore, the problem is to smooth out the frequency and power fluctuations caused by the access of wind power. Therefore, how to determine the frequency change amount generated by the power generation system of the offshore oil and gas field power grid in response to the change of wind power is an important issue in the operation of the offshore oil and gas field power grid after the offshore wind power is connected to the grid.

[0004] In the prior art, the calculation of output frequency change of the power generation system of an offshore oil and gas field is mainly applicable to conventional offshore oil and gas platforms, and there is no method for determining the output frequency change of the offshore oil and gas field power grid connected to wind power. Summary of the invention

[0005] The present invention provides a method for determining the frequency change of an offshore oil and gas field power grid suitable for wind power access, so as to solve the defect in the prior art that there is no method for calculating the output frequency change of an offshore oil and gas field power grid connected to wind power, and realize the determination of the frequency change of an offshore oil and gas field power grid suitable for wind power access.

[0006] The present invention provides a method for determining frequency variation of an offshore oil and gas field power grid applicable to wind power access, the method comprising: Determine the equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, wherein the equivalent parameters include a governor proportional coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; Obtaining wind power output change information in the offshore oil and gas field power grid, wherein the wind power output change information reflects the wind power output change status of the wind power connected to the offshore oil and gas field power grid; The output frequency change amount of the power generation system in the offshore oil and gas field power grid is determined based on the wind power output change information and the equivalent parameters.

[0007] According to a method for determining frequency variation of an offshore oil and gas field power grid applicable to wind power access provided by the present invention, the method for determining the output frequency variation of the power generation system in the offshore oil and gas field power grid based on the wind power output variation information and the equivalent parameter comprises: Determining a mechanical power variation of the power generation system based on a governor proportionality coefficient of the power generation system and a prime mover time constant of the power generation system; Determining an inertia response and a damping response of the power generation system based on an inertia time constant and a damping coefficient of the power generation system; The output frequency change is determined based on the mechanical power change of the power generation system, the inertia response and the damping response, the wind power output change information, and the load of the offshore oil and gas field power grid.

[0008] According to a method for determining frequency variation of an offshore oil and gas field power grid applicable to wind power access provided by the present invention, the step of obtaining wind power output variation information in the offshore oil and gas field power grid includes: When there is fluctuation in the wind power connected to the offshore oil and gas field power grid, the wind power output change information is obtained based on a first preset formula, and the first preset formula is: ; in, represents the wind power output change information, Indicates the fluctuation ratio of wind power per unit time, represents the time constant of offshore wind power, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

[0009] According to a method for determining frequency variation of an offshore oil and gas field power grid applicable to wind power access provided by the present invention, the step of obtaining wind power output variation information in the offshore oil and gas field power grid includes: When the wind power connected to the offshore oil and gas field power grid is disconnected from the grid, the wind power output change information is obtained based on a second preset formula, and the second preset formula is: ; in, represents the wind power output change information, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

[0010] According to a method for determining frequency variation of an offshore oil and gas field power grid applicable to wind power access provided by the present invention, the equivalent parameters of the power generation system in the offshore oil and gas field power grid are determined according to the start and stop status of the generator sets in the offshore oil and gas field power grid, including: The equivalent parameters of the power generation system are determined according to the rated power, governor proportional coefficient, prime mover time constant, inertia time constant and damping coefficient of each generator set started in the offshore oil and gas field power grid.

[0011] The present invention also provides a device for determining frequency variation of an offshore oil and gas field power grid suitable for wind power access, the device comprising: An equivalent parameter determination module is used to determine the equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, and the equivalent parameters include a governor proportional coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; A wind power change module, used to obtain wind power output change information in the offshore oil and gas field power grid, wherein the wind power output change information reflects the wind power output change status of the wind power connected to the offshore oil and gas field power grid; A frequency change amount determination module is used to determine the output frequency change amount of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters.

[0012] According to a device for determining frequency variation of an offshore oil and gas field power grid suitable for wind power access provided by the present invention, the method of obtaining wind power output variation information in the offshore oil and gas field power grid includes: When there is fluctuation in the wind power connected to the offshore oil and gas field power grid, the wind power output change information is obtained based on the first preset formula; when the wind power connected to the offshore oil and gas field power grid is disconnected from the grid, the wind power output change information is obtained based on the second preset formula; The first preset formula is: ; The second preset formula is: ; in, represents the wind power output change information, Indicates the fluctuation ratio of wind power per unit time, represents the time constant of offshore wind power, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

[0013] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements any of the above-described methods for determining the frequency change of an offshore oil and gas field power grid applicable to wind power access.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for determining frequency change of an offshore oil and gas field power grid applicable to wind power access.

[0015] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned methods for determining the frequency change amount of an offshore oil and gas field power grid applicable to wind power access.

[0016] The method for determining the frequency change of an offshore oil and gas field power grid suitable for wind power access provided by the present invention obtains equivalent parameters of the power generation system based on the start and stop conditions of each generator set in the power generation system of the offshore oil and gas field power grid, obtains wind power output change information in the offshore oil and gas field power grid, and determines the output frequency change of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters of the power generation system, thereby realizing the calculation of the frequency change of the offshore oil and gas field power grid with wind power added. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of a method for determining frequency variation of an offshore oil and gas field power grid applicable to wind power access provided by the present invention.

[0019] Figure 2 It is a structural schematic diagram of an experimental system for a method for determining frequency variation of an offshore oil and gas field power grid suitable for wind power access provided by the present invention.

[0020] Figure 3 The experimental effect of the method for determining the frequency variation of offshore oil and gas field power grid applicable to wind power access provided by the present invention is shown in FIG. Figure 1 .

[0021] Figure 4The experimental effect of the method for determining the frequency variation of offshore oil and gas field power grid applicable to wind power access provided by the present invention is shown in FIG. Figure 2 .

[0022] Figure 5 The experimental effect of the method for determining the frequency variation of offshore oil and gas field power grid applicable to wind power access provided by the present invention is shown in FIG. Figure 3 .

[0023] Figure 6 It is a structural schematic diagram of a device for determining frequency variation of an offshore oil and gas field power grid suitable for wind power access provided by the present invention.

[0024] Figure 7 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figure 1-5 The present invention provides a method for determining the frequency variation of an offshore oil and gas field power grid applicable to wind power access. Figure 1 As shown, the method for determining the frequency change of an offshore oil and gas field power grid applicable to wind power access provided by the present invention comprises the following steps: S110, determining equivalent parameters of the power generation system according to the start / stop status of each generator set in the power generation system of the offshore oil and gas field power grid, the equivalent parameters including a governor proportional coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; S120, obtaining wind power output change information in the offshore oil and gas field power grid, where the wind power output change information reflects the wind power output change status of the wind power grid connected to the offshore oil and gas field power grid; S130, determining an output frequency change of a power generation system in an offshore oil and gas field power grid based on wind power output change information and equivalent parameters.

[0027] In the method provided by the present invention, the power generation system of the offshore oil and gas field power grid includes multiple generator sets and is connected to wind power. The generator set is a turbine generator set, which can be a fuel generator set or a gas generator set. The frequency model of the generator set can be regarded as a combination of a speed governor, a prime mover, and a synchronous generator. That is, the frequency of the generator set is related to the parameters of the speed governor, the prime mover, and the synchronous generator. The speed governor, the prime mover, and the synchronous generator together constitute the frequency response dynamics of the generator set. In actual operation, multiple generator sets may be partially turned on and partially turned off. For the generator sets that are started, in the method provided by the present invention, all the generator sets that are started are regarded as an aggregated frequency response model, and the corresponding equivalent parameters include the speed governor proportional parameter, the prime mover time constant, the inertia time constant, and the damping coefficient. That is to say, for a single generator set, its speed governor proportional coefficient, the prime mover time constant, the inertia time constant, and the damping coefficient are determined, but in the method provided by the present invention, all the generator sets that are started are regarded as an aggregated generator set, and the frequency change is determined according to the speed governor proportional coefficient, the prime mover time constant, the inertia time constant, and the damping coefficient of the aggregated generator set.

[0028] Specifically, according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, the equivalent parameters of the power generation system are determined, including: According to the rated power, governor proportional coefficient, prime mover time constant, inertia time constant and damping coefficient of each generator set started in the offshore oil and gas field power grid, the equivalent parameters of the power generation system are determined.

[0029] The calculation process of each equivalent parameter of the power generation system in the offshore oil and gas field power grid can be expressed by the formula: ; ; ; ; Wherein, H and D represent the inertia time constant and damping coefficient of the equivalent parameters of the power generation system in the offshore oil and gas field power grid, respectively; is the collection of gas / oil generator sets in OPCES, and ; Turbine generator set The start and stop status of the generator set, such as At startup, ,otherwise ; and Indicates the generator set The inertia time constant and damping coefficient of the synchronous generator; s is the Laplace operator, Indicates the generator set Rated power, Represents the governor proportionality factor in the equivalent parameters of the power generation system in the offshore oil and gas field power grid; Represents the prime mover constant in the equivalent parameters of the power generation system in the offshore oil and gas field power grid; Turbine generator set The proportional coefficient of the speed regulator; Turbine generator set The time constant of the prime mover.

[0030] In an offshore oil and gas field power grid connected to wind power, since wind power has strong volatility, the output frequency of the power generation system of the offshore oil and gas field power grid will change in response to changes in wind power output. In the method provided by the present invention, the output frequency change amount of the power generation system in the offshore oil and gas field power grid is determined based on the wind power output change information and the equivalent parameters of the power generation system, specifically including: Determine the mechanical power change of the power generation system based on the governor proportional coefficient of the power generation system and the prime mover time constant of the power generation system; Determine the inertia response and damping response of the power generation system based on the inertia time constant and damping coefficient of the power generation system; The output frequency change is determined based on the mechanical power change, inertia response and damping response of the power generation system, wind power output change information and the load of the offshore oil and gas field power grid.

[0031] It is worth noting that the determination of the mechanical power variation of the power generation system in the present invention is not to obtain an exact value, but to obtain the relationship between the mechanical power variation of the power generation system and the output frequency variation. Specifically, the speed regulator of the generator set adopts a PI controller to realize differential and non-differential frequency regulation. Since the controllers used by the generator sets in the offshore oil and gas field power grid are basically digital speed regulator controllers with millisecond-level response capabilities, the delay of the frequency regulation command can be ignored, and the response process of the prime mover is described by a first-order inertia link. Therefore, the calculation method of the mechanical power variation output by the prime mover caused by the frequency deviation is shown in the following formula: ; in, Represents the change in mechanical power of the power generation system, Indicates the output frequency change of the power generation system.

[0032] The inertia response and damping vector of the power generation system can be expressed as: .

[0033] Based on the mechanical power change, inertia response and damping response of the power generation system, wind power output change information and the load of the offshore oil and gas field power grid, the output frequency change is determined by the following formula: ; in, represents the initial value of the mechanical power output of the prime mover of the power generation system, Indicates wind power output change information, Represents the load of the offshore oil and gas field power grid.

[0034] The following is a detailed description of the method for obtaining wind power output change information of the offshore oil and gas field power grid. In the method provided by the present invention, the wind power fluctuation model is modeled for the two different states existing during the operation of the offshore wind turbine, so as to simulate the wind power fluctuation under normal working conditions and the power mutation when the wind power is disconnected from the grid under fault conditions. Specifically, obtaining the wind power output change information in the offshore oil and gas field power grid includes: When there is fluctuation in wind power connected to the offshore oil and gas field power grid, wind power output change information is obtained based on a first preset formula, which is: ; When the wind power connected to the offshore oil and gas field power grid is disconnected from the grid, the wind power output change information is obtained based on the second preset formula, which is: ; in, represents the wind power output change information, Indicates the fluctuation ratio of wind power per unit time, represents the time constant of offshore wind power, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

[0035] The first preset formula reflects the power fluctuation model of offshore wind power under normal operating conditions (the wind power output will fluctuate based on wind fluctuations but will not be disconnected from the grid). The second preset formula reflects the power change model of offshore wind power at the moment the wind power is disconnected from the grid and during the period of time when the microgrid smoothes its power fluctuations.

[0036] The method provided by the present invention establishes a high-efficiency and high-precision frequency response model for offshore oil and gas field power grids connected to wind power, which can ensure that the frequency changes of the power generation system in the offshore oil and gas field power grid are determined quickly and in real time, thereby further adjusting the operation strategy of the generator set in the offshore oil and gas field power grid and smoothing the imbalance between power grid supply and demand caused by wind power uncertainty.

[0037] In order to verify the correctness and effectiveness of the method provided by the present invention, the present invention takes a certain offshore oil and gas field as an example for verification. The system structure of the offshore oil and gas field is as follows: Figure 2 As shown in the figure, the offshore oil and gas field system consists of four interconnected offshore oil and gas platforms. Platform A1 and platform A2 form a production unit, and platform B1 and platform B2 form another production unit. The two production units are interconnected by a 15km cable to ensure the overall power supply reliability. The offshore oil and gas field is equipped with a gas compressor (C1) and two oil pumps with rated power (P1~P2). In order to meet the power supply demand, a total of 9 generator sets are configured, including two gas generator sets (G1~G2) and 7 fuel generator sets (G3~G9). The offshore wind turbine can be connected to the platform power grid through platform A1. The load change curve and wind power change curve in the offshore oil and gas field system in the verification experiment are shown in Figure 2. Figure 3 shown.

[0038] Under two operating conditions, the wind turbine is operating normally and not disconnected from the grid, and the wind turbine is disconnected from the grid due to a fault, the actual frequency change and the frequency change obtained by the method provided by the present invention are compared. The verification results of the frequency change of the wind turbine power that is operating normally and not disconnected from the grid are as follows: Figure 4 As shown in the figure, the verification results of the instantaneous frequency change of the wind turbine fault disconnection are as follows Figure 5 shown.

[0039] Depend on Figure 4 It can be seen that when the offshore wind power fluctuates, the frequency response waveform of the method provided by the present invention is basically consistent with the actual situation. This is because compared with the time constant of the comprehensive inertia and the time constant of the offshore wind turbine, the time constant of the prime mover model of the turbine generator set is very small, and has little effect on the dynamic characteristics of the system frequency, and the response process of the prime mover can be ignored. Therefore, under normal operating conditions, the method proposed by the present invention can accurately characterize the impact of the power fluctuation of offshore wind power on the system frequency.

[0040] Depend on Figure 5 It can be seen that when the offshore wind power is disconnected from the grid, the frequency response waveform of the method provided by the present invention is basically consistent with the actual situation. It can be seen that when the offshore wind power is disconnected from the grid, taking into account the influence of the time constant of the prime mover on the frequency response characteristics can significantly improve the accuracy of the model calculation. Therefore, when the offshore wind power is disconnected from the grid, the method proposed by the present invention can also accurately characterize the impact of the offshore disconnection on the frequency of the offshore oil and gas field power grid.

[0041] The following is a description of the frequency change amount determination device for offshore oil and gas field power grids applicable to wind power access provided by the present invention. The frequency change amount determination device for offshore oil and gas field power grids applicable to wind power access described below and the frequency change amount determination method for offshore oil and gas field power grids applicable to wind power access described above can be referred to each other. Figure 6As shown, the device for determining the frequency change amount of an offshore oil and gas field power grid suitable for wind power access provided by the present invention includes the following modules: The equivalent parameter determination module 610 is used to determine the equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, and the equivalent parameters include the governor proportional coefficient, the prime mover time constant, the inertia time constant and the damping coefficient; The wind power change module 620 is used to obtain wind power output change information in the offshore oil and gas field power grid, and the wind power output change information reflects the wind power output change of the offshore oil and gas field power grid; The frequency variation determination module 630 is used to determine the output frequency variation of the power generation system in the offshore oil and gas field power grid based on the wind power output variation information and equivalent parameters.

[0042] The wind power change module is specifically used to obtain wind power output change information based on a first preset formula when there is fluctuation in wind power connected to the offshore oil and gas field power grid, and to obtain wind power output change information based on a second preset formula when wind power connected to the offshore oil and gas field power grid is disconnected from the grid; The first preset formula is: ; The second preset formula is: ; in, Indicates wind power output change information, Indicates the fluctuation ratio of wind power per unit time, represents the time constant of offshore wind power, Indicates the upper limit of wind power output connected to the offshore oil and gas field power grid, represents the Laplace operator.

[0043] Figure 7 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 7As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730 and a communication bus 740, wherein the processor 710, the communication interface 720 and the memory 730 communicate with each other through the communication bus 740. The processor 710 may call the logic instructions in the memory 730 to execute a method for determining the frequency change amount of an offshore oil and gas field power grid suitable for wind power access, the method comprising: determining the equivalent parameters of the power generation system according to the start and stop states of each generator set in the power generation system of the offshore oil and gas field power grid, the equivalent parameters including the governor proportional coefficient, the prime mover time constant, the inertia time constant and the damping coefficient; obtaining the wind power output change information in the offshore oil and gas field power grid, the wind power output change information reflecting the wind power output change situation of the wind power connected to the offshore oil and gas field power grid; determining the output frequency change amount of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters.

[0044] In addition, the logic instructions in the above-mentioned memory 730 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0045] On the other hand, the present invention also provides a computer program product, which includes a computer program, and the computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the frequency change determination method for an offshore oil and gas field power grid suitable for wind power access provided by the above methods, the method including: determining equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, the equivalent parameters including the governor proportional coefficient, the prime mover time constant, the inertia time constant and the damping coefficient; obtaining wind power output change information in the offshore oil and gas field power grid, the wind power output change information reflecting the wind power output change of the wind power connected to the offshore oil and gas field power grid; determining the output frequency change of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters.

[0046] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the frequency change determination method for an offshore oil and gas field power grid suitable for wind power access provided by the above-mentioned methods, the method comprising: determining equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, the equivalent parameters including the governor proportional coefficient, the prime mover time constant, the inertia time constant and the damping coefficient; obtaining wind power output change information in the offshore oil and gas field power grid, the wind power output change information reflecting the wind power output change of the wind power connected to the offshore oil and gas field power grid; determining the output frequency change of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters.

[0047] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0048] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining frequency variation of an offshore oil and gas field power grid suitable for wind power access, characterized in that: The method comprises: Determine the equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, wherein the equivalent parameters include a governor proportional coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; Obtaining wind power output change information in the offshore oil and gas field power grid, wherein the wind power output change information reflects the wind power output change status of the wind power connected to the offshore oil and gas field power grid; The output frequency change amount of the power generation system in the offshore oil and gas field power grid is determined based on the wind power output change information and the equivalent parameters.

2. The method for determining frequency variation of offshore oil and gas field power grid applicable to wind power access according to claim 1, characterized in that: The determining the output frequency change of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameter includes: Determining a mechanical power variation of the power generation system based on a governor proportionality coefficient of the power generation system and a prime mover time constant of the power generation system; Determining an inertia response and a damping response of the power generation system based on an inertia time constant and a damping coefficient of the power generation system; The output frequency change is determined based on the mechanical power change of the power generation system, the inertia response and the damping response, the wind power output change information, and the load of the offshore oil and gas field power grid.

3. The method for determining frequency variation of offshore oil and gas field power grid applicable to wind power access according to claim 1, characterized in that: The obtaining of wind power output change information in the offshore oil and gas field power grid includes: When there is fluctuation in the wind power connected to the offshore oil and gas field power grid, the wind power output change information is obtained based on a first preset formula, and the first preset formula is: ； in, represents the wind power output change information, Indicates the fluctuation ratio of wind power per unit time, represents the time constant of offshore wind power, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

4. The method for determining frequency variation of offshore oil and gas field power grid applicable to wind power access according to claim 1, characterized in that: The obtaining of wind power output change information in the offshore oil and gas field power grid includes: When the wind power connected to the offshore oil and gas field power grid is disconnected from the grid, the wind power output change information is obtained based on a second preset formula, and the second preset formula is: ； in, represents the wind power output change information, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

5. The method for determining frequency variation of offshore oil and gas field power grid applicable to wind power access according to claim 1, characterized in that: Determining the equivalent parameters of the power generation system in the offshore oil and gas field power grid according to the start and stop status of the generator set in the offshore oil and gas field power grid includes: The equivalent parameters of the power generation system are determined according to the rated power, governor proportional coefficient, prime mover time constant, inertia time constant and damping coefficient of each generator set started in the offshore oil and gas field power grid.

6. A device for determining frequency variation of an offshore oil and gas field power grid suitable for wind power access, characterized in that: The device comprises: An equivalent parameter determination module is used to determine the equivalent parameters of the power generation system according to the start and stop status of each generator set in the power generation system of the offshore oil and gas field power grid, and the equivalent parameters include a governor proportional coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; A wind power change module, used to obtain wind power output change information in the offshore oil and gas field power grid, wherein the wind power output change information reflects the wind power output change status of the wind power connected to the offshore oil and gas field power grid; A frequency change amount determination module is used to determine the output frequency change amount of the power generation system in the offshore oil and gas field power grid based on the wind power output change information and the equivalent parameters.

7. The device for determining frequency variation of offshore oil and gas field power grid suitable for wind power access according to claim 6, characterized in that: The obtaining of wind power output change information in the offshore oil and gas field power grid includes: When there is fluctuation in the wind power connected to the offshore oil and gas field power grid, the wind power output change information is obtained based on the first preset formula; when the wind power connected to the offshore oil and gas field power grid is disconnected from the grid, the wind power output change information is obtained based on the second preset formula; The first preset formula is: ； The second preset formula is: ； in, represents the wind power output change information, Indicates the fluctuation ratio of wind power per unit time, represents the time constant of offshore wind power, represents the upper limit of wind power output power connected to the offshore oil and gas field power grid, represents the Laplace operator.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for determining the frequency change of an offshore oil and gas field power grid applicable to wind power access as described in any one of claims 1 to 5 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining the frequency change of an offshore oil and gas field power grid applicable to wind power access as claimed in any one of claims 1 to 5 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for determining the frequency change of an offshore oil and gas field power grid applicable to wind power access as claimed in any one of claims 1 to 5 is implemented.

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