Method for determining frequency variation of offshore oil and gas field power grid suitable for wind power access

Abstract

The application provides a method for determining the frequency variation of an offshore oil and gas field power grid connected with wind power, and relates to the technical field of micro power grids. The method comprises the following 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 the offshore oil and gas field power grid, wherein the equivalent parameters comprise a governor proportional coefficient, a prime mover time constant, an inertia time constant and a damping coefficient; obtaining wind power output variation information of the offshore oil and gas field power grid, wherein the wind power output variation information reflects the wind power output variation of the offshore oil and gas field power grid connected with wind power; and determining the output frequency variation of the power generation system of the offshore oil and gas field power grid based on the wind power output variation information and the equivalent parameters. The application can calculate the frequency variation of the offshore oil and gas field power grid connected with wind power.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of micro-grid, in particular to a method for determining frequency variation of offshore oil and gas field power grid suitable for wind power access. BACKGROUND

[0002] The offshore oil and gas field is a production, gathering and transportation system for offshore oil and gas production, gathering and transportation. Usually, gas or oil generators are configured on multiple platforms for power supply. After wind power is connected to the grid, the offshore oil and gas field becomes a wind-gas-oil-based offshore platform group energy system with wind-gas-oil-based offshore wind power coordinated power supply, in which the offshore wind power and the gas / oil turbine generator set are cooperatively operated. The excess oil and gas is transported out by a ship or a pipeline through an oil pump and a compressor.

[0003] The offshore wind power has natural uncertainty. After the offshore wind power is connected to the grid, the turbine generator set becomes the only power source for suppressing the uncertainty of the offshore wind power. In the off-grid operation mode, the offshore platform group energy system with offshore wind power coordinated power supply realizes energy self-sufficiency through offshore wind power and turbine generator set. In the low period of offshore wind power, the turbine generator set mainly consumes self-produced natural gas and crude oil for power supply. In the peak period of offshore wind power, the turbine generator set reduces the output to ensure the maximum consumption level of offshore wind power. When the offshore oil and gas field power grid with wind power access is normally operated, the energy demand of the offshore oil and gas field almost has no large fluctuation, so the problem is to suppress the frequency and power fluctuation caused by wind power access. Therefore, how to determine the frequency variation of the offshore oil and gas field power grid caused by the change of the power generation system in response to the wind power is an important problem for the offshore oil and gas field power grid with wind power access.

[0004] In the prior art, the calculation of the output frequency variation of the power generation system of the offshore oil and gas field is mainly suitable for conventional offshore oil and gas platforms, and there is no method for determining the output frequency variation of the offshore oil and gas field power grid with wind power access. SUMMARY

[0005] The present application provides a method for determining the frequency variation of the offshore oil and gas field power grid suitable for wind power access, which solves the defect that there is no method for calculating the output frequency variation of the offshore oil and gas field power grid with wind power access in the prior art, and realizes the determination of the frequency variation of the offshore oil and gas field power grid suitable for wind power access.

[0006] The present application provides a method for determining the frequency variation of the offshore oil and gas field power grid suitable for wind power access, which includes:

[0007] According to the start-stop state 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 the governor proportional coefficient, the prime mover time constant, the inertia time constant and the damping coefficient;

[0008] The wind power output change information in the offshore oil and gas field power grid is obtained, and the wind power output change information reflects the wind power output change connected to the offshore oil and gas field power grid.

[0009] The output frequency change 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.

[0010] According to the present invention, a method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration is provided. 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 parameters includes:

[0011] Based on the governor proportional coefficient of the power generation system and the prime mover time constant of the power generation system, the mechanical power change of the power generation system is determined.

[0012] Based on the inertia time constant and damping coefficient of the power generation system, determine the inertia response and damping response of the power generation system;

[0013] The output frequency variation is determined based on the mechanical power variation of the power generation system, the inertial response and damping response, the wind power output variation information, and the load of the offshore oil and gas field power grid.

[0014] According to the present invention, a method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration is provided, wherein obtaining wind power output variation information in the offshore oil and gas field power grid includes:

[0015] When the wind power connected to the offshore oil and gas field power grid fluctuates, the wind power output change information is obtained based on a first preset formula, which is:

[0016] ;

[0017] in, This indicates the information regarding changes in wind power output. This represents the rate of fluctuation in wind power per unit time. Represents the time constant for offshore wind power. This indicates the upper limit of wind power output connected to the offshore oil and gas field's power grid. This represents the Laplace operator.

[0018] According to the present invention, a method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration is provided, wherein obtaining wind power output variation information in the offshore oil and gas field power grid includes:

[0019] 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, which is:

[0020] ;

[0021] in, This indicates the information regarding changes in wind power output. This indicates the upper limit of wind power output connected to the offshore oil and gas field's power grid. This represents the Laplace operator.

[0022] According to the present invention, a method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration is provided. The method for determining the equivalent parameters of the power generation system in the offshore oil and gas field power grid based on the start-up and shutdown status of the generator units in the grid includes:

[0023] The equivalent parameters of the power generation system are determined based on the rated power, governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient of each generator unit started in the offshore oil and gas field power grid.

[0024] The present invention also provides a device for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration, the device comprising:

[0025] The equivalent parameter determination module is used to determine the equivalent parameters of the power generation system based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient.

[0026] The wind power output change module is used to acquire 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 situation connected to the offshore oil and gas field power grid.

[0027] The frequency change determination module is used to determine 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.

[0028] According to the present invention, a device for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration is provided. The step of acquiring wind power output variation information in the offshore oil and gas field power grid includes:

[0029] When the wind power connected to the offshore oil and gas field power grid fluctuates, the wind power output change information is obtained based on a 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 a second preset formula.

[0030] The first preset formula is:

[0031] ;

[0032] The second preset formula is:

[0033] ;

[0034] in, This indicates the information regarding changes in wind power output. This represents the rate of fluctuation in wind power per unit time. Represents the time constant for offshore wind power. This indicates the upper limit of wind power output connected to the offshore oil and gas field's power grid. This represents the Laplace operator.

[0035] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power access as described above.

[0036] 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 the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power integration as described above.

[0037] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power access as described above.

[0038] The present invention provides a method for determining the frequency variation of offshore oil and gas field power grids with wind power integration. By obtaining the equivalent parameters of the power generation system based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid, the method obtains the wind power output variation information in the offshore oil and gas field power grid, and determines 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 parameters of the power generation system. This method realizes the calculation of the frequency variation of offshore oil and gas field power grids with wind power integration. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power integration, provided by the present invention.

[0041] Figure 2 This is a schematic diagram of the experimental system for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration, as provided by the present invention.

[0042] Figure 3 This is a schematic diagram of the experimental results of the method for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration provided by the present invention. Figure 1 .

[0043] Figure 4 This is a schematic diagram of the experimental results of the method for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration provided by the present invention. Figure 2 .

[0044] Figure 5 This is a schematic diagram of the experimental results of the method for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration provided by the present invention. Figure 3 .

[0045] Figure 6 This is a schematic diagram of the device for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration, provided by the present invention.

[0046] Figure 7 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] The following is combined Figures 1-5 This invention describes a method for determining frequency variations in offshore oil and gas field power grids suitable for wind power integration. For example... Figure 1 As shown, the method for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration provided by the present invention includes the following steps:

[0049] S110. Based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid, determine the equivalent parameters of the power generation system. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient.

[0050] S120. Obtain information on wind power output changes in the offshore oil and gas field power grid. The information on wind power output changes reflects the changes in wind power output connected to the offshore oil and gas field power grid.

[0051] S130. Determine the output frequency change of the power generation system in the offshore oil and gas field power grid based on wind power output change information and equivalent parameters.

[0052] In the method provided by this 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 sets are turbine generator sets, which can be oil-fired or gas-fired generator sets. The frequency model of the generator set can be considered as a combination of a governor, prime mover, and synchronous generator. That is, the frequency of the generator set is related to the parameters of the governor, prime mover, and synchronous generator, and the governor, prime mover, and synchronous generator together constitute the dynamic frequency response 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, the method provided by this invention treats all started generator sets as an aggregated frequency response model, whose corresponding equivalent parameters include the governor proportional parameter, prime mover time constant, inertia time constant, and damping coefficient. In other words, for a single generator set, its governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient are determined. However, in the method provided by this invention, all started generator sets are considered as an aggregated generator set, and the frequency change is determined based on the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient of this aggregated generator set.

[0053] Specifically, based on the start-up and shutdown status of each generator unit in the offshore oil and gas field power grid's power generation system, the equivalent parameters of the power generation system are determined, including:

[0054] The equivalent parameters of the power generation system are determined based on the rated power, governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient of each generator unit started in the offshore oil and gas field power grid.

[0055] The calculation process for various equivalent parameters of the power generation system in an offshore oil and gas field power grid can be expressed by the following formula:

[0056] ;

[0057] ;

[0058] ;

[0059] ;

[0060] Wherein, H and D represent the inertia time constant and damping coefficient, respectively, in the equivalent parameters of the power generation system in the offshore oil and gas field power grid; This refers to the collection of gas / oil generator sets in OPCES, and ; Indicates turbine generator set Start-stop status, such as generator set At startup, ,otherwise ; and Indicates generator set The inertial time constant and damping coefficient of a synchronous generator; s is the Laplace operator. Indicates generator set Rated power, This refers to the governor proportional coefficient in the equivalent parameters of the power generation system in an offshore oil and gas field power grid. This represents the prime mover constant in the equivalent parameters of the power generation system in the offshore oil and gas field power grid; Indicates turbine generator set The proportional coefficient of the speed controller; Indicates turbine generator set The time constant of the prime mover.

[0061] In offshore oil and gas field power grids connected to wind power, due to the strong volatility of wind power, the output frequency of the power generation system in response to changes in wind power output will change. The method provided in this invention determines the change in output frequency of the power generation system in the offshore oil and gas field power grid based on wind power output change information and equivalent parameters of the power generation system. Specifically, it includes:

[0062] Based on the governor proportional coefficient of the power generation system and the prime mover time constant of the power generation system, the change in mechanical power of the power generation system is determined.

[0063] Based on the inertia time constant and damping coefficient of the power generation system, determine the inertia response and damping response of the power generation system;

[0064] The output frequency variation is determined based on the mechanical power variation, inertial response and damping response of the power generation system, wind power output variation information and the load of the offshore oil and gas field power grid.

[0065] It is worth noting that the determination of the mechanical power change of the power generation system in this invention does not yield a precise numerical value, but rather a relationship between the mechanical power change and the output frequency change. Specifically, the speed governor of the generator set uses a PI controller to achieve both differential and zero-error frequency regulation. Since the controllers used in generator sets in offshore oil and gas field power grids are basically digital speed governor controllers with millisecond-level response capabilities, the delay of the frequency regulation command can be ignored. The response process of the prime mover is described by a first-order inertial element. Therefore, the calculation method for the mechanical power change of the prime mover output caused by the frequency deviation is shown in the following formula:

[0066] ;

[0067] in, This represents the change in the mechanical power of the power generation system. This indicates the change in the output frequency of the power generation system.

[0068] The inertial response and damping vector of the power generation system can be expressed as: .

[0069] Based on the changes in mechanical power, inertial response, and damping response of the power generation system, information on wind power output changes, and the load of the offshore oil and gas field power grid, the change in output frequency is determined by the following formula:

[0070] ;

[0071] in, This represents the initial value of the mechanical power output from the prime mover of the power generation system. This indicates information about changes in wind power output. This indicates the load on the power grid of offshore oil and gas fields.

[0072] The following provides a detailed explanation of the method for obtaining wind power output variation information from offshore oil and gas field power grids. The method provided in this invention models wind power fluctuations under two different operating states of offshore wind turbines, respectively, to simulate wind power fluctuations under normal operating conditions and power surges when wind power disconnects from the grid under fault conditions. Specifically, obtaining wind power output variation information from the offshore oil and gas field power grid includes:

[0073] When wind power connected to the offshore oil and gas field power grid fluctuates, the information on changes in wind power output is obtained based on a first preset formula, which is:

[0074] ;

[0075] When wind power connected to the offshore oil and gas field power grid is disconnected from the grid, the information on changes in wind power output is obtained based on a second preset formula, which is:

[0076] ;

[0077] in, This indicates the information regarding changes in wind power output. This represents the rate of fluctuation in wind power per unit time. Represents the time constant for offshore wind power. This indicates the upper limit of wind power output connected to the offshore oil and gas field's power grid. This represents the Laplace operator.

[0078] The first preset formula reflects the power fluctuation model of offshore wind power under normal operating conditions (the output power of wind power will fluctuate based on wind fluctuations but is not disconnected from the grid). The second preset formula reflects the power change model of offshore wind power at the moment of wind power disconnection and during the period when the microgrid smooths out its power fluctuations.

[0079] The method provided by this invention establishes a high-efficiency and high-precision frequency response model for offshore oil and gas field power grids connected to wind power. This model can ensure the rapid and real-time determination of frequency changes in the power generation system in the offshore oil and gas field power grid, thereby further adjusting the operating strategy of the generator units in the offshore oil and gas field power grid and mitigating the power grid supply and demand imbalance caused by the uncertainty of wind power.

[0080] To verify the correctness and effectiveness of the method provided in this invention, a specific offshore oil and gas field is used as an example. The system structure of this offshore oil and gas field is as follows: Figure 2 As shown, the offshore oil and gas field system consists of four interconnected offshore oil and gas platforms. Platforms A1 and A2 form one production unit, and platforms B1 and B2 form another. The two production units are interconnected by a 15km cable to ensure overall power supply reliability. The offshore oil and gas field is equipped with one gas compressor (C1) and two oil pumps (P1~P2) with rated power. To meet power supply demands, a total of nine generator sets are configured, including two gas generator sets (G1~G2) and seven oil generator sets (G3~G9). Offshore wind turbines can be connected to the platform grid via platform A1. The load variation curves and wind power variation curves of the offshore oil and gas field system in the verification experiment are shown below. Figure 3 As shown.

[0081] Under two operating conditions—wind turbines operating normally without disconnecting from the grid and wind turbines disconnected from the grid due to a fault—the differences between the actual frequency changes and the frequency changes obtained by the method provided in this invention were compared. The verification results for the frequency change of wind turbine power operating normally without disconnecting from the grid are as follows: Figure 4As shown, the verification results for the instantaneous frequency change during grid disconnection due to wind turbine faults are as follows: Figure 5 As shown.

[0082] Depend on Figure 4 As can be seen, when offshore wind power fluctuates, the frequency response waveform provided by this invention basically coincides with the actual situation. This is because, compared with the combined inertia time constant 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 its impact on the dynamic characteristics of the system frequency is relatively small; the response process of the prime mover can be ignored. Therefore, under normal operating conditions, the method proposed in this invention can accurately characterize the impact of offshore wind power fluctuations on the system frequency.

[0083] Depend on Figure 5 It can be seen that when offshore wind power is disconnected from the grid, the frequency response waveform provided by this invention basically coincides with the actual situation. Therefore, when offshore wind power is disconnected from the grid, taking into account the influence of the prime mover's time constant on the frequency response characteristics can significantly improve the accuracy of the model calculation. Thus, when offshore wind power is disconnected from the grid, the method proposed in this invention can also accurately characterize the impact of offshore grid disconnection on the frequency of the offshore oil and gas field power grid.

[0084] The following describes the device for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration, provided by the present invention. The device described below can be referred to in correspondence with the method described above for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration. Figure 6 As shown, the device for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration provided by the present invention includes the following modules:

[0085] The equivalent parameter determination module 610 is used to determine the equivalent parameters of the power generation system based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant and damping coefficient.

[0086] The wind power output change module 620 is used to acquire wind power output change information in the offshore oil and gas field power grid. The wind power output change information reflects the wind power output change situation connected to the offshore oil and gas field power grid.

[0087] The frequency change determination module 630 is used to determine the output frequency change of the power generation system in the offshore oil and gas field power grid based on wind power output change information and equivalent parameters.

[0088] The wind power output change module is specifically used to obtain wind power output change information based on a first preset formula when there are fluctuations 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.

[0089] The first preset formula is:

[0090] ;

[0091] The second preset formula is:

[0092] ;

[0093] in, This indicates information about changes in wind power output. This represents the rate of fluctuation in wind power per unit time. Represents the time constant for offshore wind power. This indicates the upper limit of wind power output connected to the offshore oil and gas field power grid. This represents the Laplace operator.

[0094] Figure 7 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 7 As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730, and a communication bus 740. The processor 710, communication interface 720, and memory 730 communicate with each other via the communication bus 740. The processor 710 can call logical instructions in the memory 730 to execute a method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration. This method includes: determining equivalent parameters of the power generation system based on the start-up and shutdown status of each generator unit in the offshore oil and gas field power grid; the equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient; acquiring wind power output variation information in the offshore oil and gas field power grid, which reflects the wind power output variation of the connected 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 variation information and the equivalent parameters.

[0095] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0096] On the other hand, the present invention also provides a computer program product, which includes a computer program that 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 method provided above for determining the frequency variation of offshore oil and gas field power grids suitable for wind power integration. The method includes: determining equivalent parameters of the power generation system based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient; acquiring wind power output variation information in the offshore oil and gas field power grid, which reflects the wind power output variation of 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 variation information and the equivalent parameters.

[0097] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program performs the above-described method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration. The method includes: determining equivalent parameters of the power generation system based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient; acquiring wind power output variation information in the offshore oil and gas field power grid, the wind power output variation information reflecting the wind power output variation of 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 variation information and the equivalent parameters.

[0098] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0099] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration, characterized in that, The method includes: Based on the start-up and shutdown status of each generator unit in the power generation system of the offshore oil and gas field power grid, the equivalent parameters of the power generation system are determined. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient. The frequency model of all generator units is a combination of governor, prime mover, and synchronous generator. The wind power output change information in the offshore oil and gas field power grid is obtained, and the wind power output change information reflects the wind power output change connected to the offshore oil and gas field power grid. Based on the governor proportional coefficient of the power generation system and the prime mover time constant of the power generation system, the mechanical power change of the power generation system is determined. Based on the inertia time constant and damping coefficient of the power generation system, determine the inertia response and damping response of the power generation system; Based on the mechanical power change of the power generation system, the inertial response and damping response, the wind power output change information, and the load of the offshore oil and gas field power grid, the output frequency change is determined based on the following formula; P M (s) represents the initial value of the mechanical power output from the prime mover of the power generation system, ΔP M (s) represents the change in mechanical power of the power generation system, P WT (s) represents information on wind power output changes, P L (s) represents the load of the offshore oil and gas field power grid; The formula for calculating the equivalent parameter is: H and D represent the inertia time constant and damping coefficient, respectively; It is a collection of gas / oil generator sets, and μ tg Indicates the start-up and shutdown status of the turbine generator set (tg); H tg and D tg The inertial time constant and damping coefficient of the synchronous generator in the generator set tg are represented; s is the Laplace operator, P N,tg The rated power of the generator set is represented by tg, K. P T represents the governor proportional coefficient in the equivalent parameters; t K represents the prime mover time constant in the equivalent parameters; P,tg T represents the proportional coefficient of the governor in a turbine generator set; t,tg The prime mover time constant representing tg of the turbine generator set; When the wind power connected to the offshore oil and gas field power grid fluctuates, the wind power output change information is obtained based on a first preset formula, which is: k WT T represents the fluctuation rate of wind power per unit time. WT Represents the time constant for offshore wind power. This indicates the upper limit of wind power output connected to the offshore oil and gas field's power grid; 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, which is:

2. The method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power integration according to claim 1, characterized in that, The process of determining the equivalent parameters of the power generation system in the offshore oil and gas field power grid based on the start-up and shutdown status of the generator units includes: The equivalent parameters of the power generation system are determined based on the rated power, governor proportional coefficient, prime mover time constant, inertia time constant, and damping coefficient of each generator unit started in the offshore oil and gas field power grid.

3. A device for determining the frequency variation of an offshore oil and gas field power grid suitable for wind power integration, characterized in that, The device includes: The equivalent parameter determination module is used to determine the equivalent parameters of the power generation system based on the start-up and shutdown status of each generator set in the power generation system of the offshore oil and gas field power grid. The equivalent parameters include the governor proportional coefficient, prime mover time constant, inertia time constant and damping coefficient. The frequency model of all generator sets is a combination of governor, prime mover and synchronous generator. The wind power output change module is used to acquire 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 situation connected to the offshore oil and gas field power grid. The frequency change determination module is used to determine 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. Based on the governor proportional coefficient and the prime mover time constant of the power generation system, the change in mechanical power of the power generation system is determined, including: Based on the inertia time constant and damping coefficient of the power generation system, determine the inertia response and damping response of the power generation system; Based on the mechanical power change of the power generation system, the inertial response and damping response, the wind power output change information, and the load of the offshore oil and gas field power grid, the output frequency change is determined based on the following formula; P M (s) represents the initial value of the mechanical power output from the prime mover of the power generation system, ΔP M (s) represents the change in mechanical power of the power generation system, P WT (s) represents information on wind power output changes, P L (s) represents the load of the offshore oil and gas field power grid. This represents the inertial response and damping vector of the power generation system; The formula for calculating the equivalent parameter is: H and D represent the inertia time constant and damping coefficient, respectively; It is a collection of gas / oil generator sets, and μ tg Indicates the start-up and shutdown status of the turbine generator set (tg); H tg and D tg The inertial time constant and damping coefficient of the synchronous generator in the generator set tg are represented; s is the Laplace operator, P N,tg The rated power of the generator set is represented by tg, K. P T represents the governor proportional coefficient in the equivalent parameters; t K represents the prime mover time constant in the equivalent parameters; P,tg T represents the proportional coefficient of the governor in a turbine generator set; t,tg The prime mover time constant representing tg of the turbine generator set; When the wind power connected to the offshore oil and gas field power grid fluctuates, the wind power output change information is obtained based on a 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 a second preset formula. The first preset formula is: The second preset formula is: Where, k WT T represents the fluctuation rate of wind power per unit time. WT Represents the time constant for offshore wind power. This indicates the upper limit of wind power output connected to the offshore oil and gas field's power grid.

4. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power access as described in any one of claims 1 to 2.

5. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power access as described in any one of claims 1 to 2.

6. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the frequency variation of offshore oil and gas field power grids applicable to wind power access as described in any one of claims 1 to 2.

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