Power grid frequency control method of small hydroelectric generating set and related device

Abstract

The embodiment of the invention relates to the field of data processing, and provides a power grid frequency control method of a small hydroelectric generating set and a related device, and the method comprises the steps: obtaining the current frequency of the small hydroelectric generating set, and obtaining a reference network access frequency interval of a small hydroelectric generating set microgrid where the small hydroelectric generating set is located; if the current frequency is not in the reference network access frequency interval, acquiring current water inflow and environment water quantity information of the small hydropower generating set; determining a reference frequency adjustment parameter according to the frequency offset between the current frequency and the reference network access frequency interval and the operation state information of the micro-grid of the small hydroelectric generating set; frequency adjustment correction parameters are determined according to the current water inflow and the environment water quantity information; performing correction processing on the reference frequency adjustment parameter by adopting the frequency adjustment correction parameter to obtain a target frequency adjustment parameter; and performing frequency adjustment on the small hydroelectric generating set by using the target frequency adjustment parameter, thereby improving the accuracy of determining the frequency adjustment parameter.

Description

Technical Field

[0001] This application relates to the field of data processing technology, specifically to a grid frequency control method and related device for small hydropower units. Background Technology

[0002] To improve the environment, create a low-carbon, environmentally friendly, energy-saving, and emission-reducing energy system, improve the energy structure, and reduce the consumption of fossil fuels and greenhouse gas emissions, the vigorous development of small hydropower has become a trend. With the rapid development of hydropower station clusters, large-scale small hydropower clusters have been gradually built and put into operation, and small hydropower supply areas have gradually formed regional power grids. At this point, frequency regulation is required when small hydropower units are connected to the grid.

[0003] In terms of frequency regulation of small hydropower units, existing solutions typically employ a fixed regulation method, which results in low accuracy during frequency regulation. Summary of the Invention

[0004] This application provides a grid frequency control method and related device for small hydropower units, which can determine the corresponding frequency adjustment parameters by combining the current frequency of the small hydropower unit, the inflow of water, the ambient water volume, and the operating status information of the small hydropower unit microgrid, thereby improving the accuracy of frequency adjustment parameter determination.

[0005] A first aspect of this application provides a grid frequency control method for small hydropower units, the method comprising: Obtain the current frequency of the small hydropower unit, and obtain the reference grid access frequency range of the microgrid where the small hydropower unit is located; If the current frequency is not within the reference grid access frequency range, then obtain the current water inflow and environmental water volume information of the small hydropower unit; The reference frequency adjustment parameters are determined based on the frequency offset between the current frequency and the reference grid access frequency range and the operating status information of the small hydropower unit microgrid. The frequency adjustment and correction parameters are determined based on the current water inflow and the environmental water volume information. The reference frequency adjustment parameters are corrected using the frequency adjustment correction parameters to obtain the target frequency adjustment parameters. The frequency of the small hydropower unit is regulated using the target frequency regulation parameters.

[0006] In one possible implementation, determining the frequency adjustment correction parameters based on the current inflow and the environmental water volume information includes: Get the current inflow volume range; The first reference correction parameter is determined based on the water inflow range; The second reference correction parameter is determined based on the environmental water volume information; The first reference correction parameter and the second reference correction parameter are fused together to obtain the frequency adjustment correction parameter.

[0007] In one possible implementation, determining the second reference correction parameter based on the environmental water quantity information includes: Extract the current water level depth value based on the environmental water volume information; The water storage and energy storage information is determined based on the water level depth value; The second reference correction parameter is determined based on the water storage and energy storage information.

[0008] In one possible implementation, the reference frequency adjustment parameters are determined based on the frequency offset between the current frequency and the reference grid connection frequency interval and the operating status information of the small hydropower unit microgrid, including: The first sub-reference frequency adjustment parameter is determined based on the frequency offset. Obtain the offset direction information of the frequency offset; The second sub-reference frequency adjustment parameter is determined based on the offset direction information and the first sub-reference frequency adjustment parameter; Based on the operating status information, determine the third sub-reference frequency adjustment parameters; The second sub-reference frequency adjustment parameter and the third sub-reference frequency adjustment parameter are fused together to obtain the reference frequency adjustment parameter.

[0009] In one possible implementation, determining the third sub-reference frequency adjustment parameter based on the operating state information includes: Extract the overall operational fluctuation information and output frequency information of the small hydropower unit microgrid from the operational status information; The fourth sub-reference frequency adjustment parameter is determined based on the operational fluctuation information; Frequency fluctuation analysis is performed based on the output frequency information to obtain the frequency fluctuation analysis results. The fifth sub-reference frequency adjustment parameters are determined based on the frequency fluctuation analysis results. The fourth and fifth sub-reference frequency adjustment parameters are fused together to obtain the third sub-reference frequency adjustment parameter.

[0010] A second aspect of this application provides a power grid frequency control device for a small hydropower unit, the device comprising: The acquisition unit is used to acquire the current frequency of the small hydropower unit and the reference grid connection frequency range of the microgrid where the small hydropower unit is located; if the current frequency is not within the reference grid connection frequency range, the current water inflow and environmental water flow information of the small hydropower unit are acquired. The determining unit is used to determine the reference frequency adjustment parameters based on the frequency offset between the current frequency and the reference grid connection frequency interval and the operating status information of the small hydropower unit microgrid; and to determine the frequency adjustment correction parameters based on the current water inflow and the environmental water flow information. The correction unit is used to correct the reference frequency adjustment parameters using the frequency adjustment correction parameters to obtain the target frequency adjustment parameters; The regulating unit is used to regulate the frequency of the small hydropower unit using the target frequency regulating parameters.

[0011] In one possible implementation, the determining unit is specifically used for determining the frequency adjustment correction parameters based on the current inflow volume and the environmental water volume information, in which the determining unit is specifically configured to: Get the current inflow volume range; The first reference correction parameter is determined based on the water inflow range; The second reference correction parameter is determined based on the environmental water volume information; The first reference correction parameter and the second reference correction parameter are fused together to obtain the frequency adjustment correction parameter.

[0012] In one possible implementation, the determining unit is specifically configured to: determine the second reference correction parameter based on the environmental water quantity information. Extract the current water level depth value based on the environmental water volume information; The water storage and energy storage information is determined based on the water level depth value; The second reference correction parameter is determined based on the water storage and energy storage information.

[0013] In one possible implementation, in determining the reference frequency adjustment parameters based on the frequency offset between the current frequency and the reference grid connection frequency interval and the operating status information of the small hydropower unit microgrid, the determining unit is specifically used for: The first sub-reference frequency adjustment parameter is determined based on the frequency offset. Obtain the offset direction information of the frequency offset; The second sub-reference frequency adjustment parameter is determined based on the offset direction information and the first sub-reference frequency adjustment parameter; Based on the operating status information, determine the third sub-reference frequency adjustment parameters; The second sub-reference frequency adjustment parameter and the third sub-reference frequency adjustment parameter are fused together to obtain the reference frequency adjustment parameter.

[0014] In one possible implementation, the determining unit is specifically used for determining the third sub-reference frequency adjustment parameter based on the operating state information: Extract the overall operational fluctuation information and output frequency information of the small hydropower unit microgrid from the operational status information; The fourth sub-reference frequency adjustment parameter is determined based on the operational fluctuation information; Frequency fluctuation analysis is performed based on the output frequency information to obtain the frequency fluctuation analysis results. The fifth sub-reference frequency adjustment parameters are determined based on the frequency fluctuation analysis results. The fourth and fifth sub-reference frequency adjustment parameters are fused together to obtain the third sub-reference frequency adjustment parameter.

[0015] A third aspect of this application provides a terminal including a processor, an input device, an output device, and a memory, wherein the processor, input device, output device, and memory are interconnected, wherein the memory is used to store a computer program, the computer program including program instructions, and the processor is configured to invoke the program instructions to execute the step instructions as described in the first aspect of this application.

[0016] A fourth aspect of this application provides a computer-readable storage medium storing a computer program for electronic data interchange, wherein the computer program causes a computer to perform some or all of the steps described in the first aspect of this application.

[0017] A fifth aspect of this application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps described in the first aspect of this application. The computer program product may be a software installation package.

[0018] Implementing the embodiments of this application has the following beneficial effects: By acquiring the current frequency of the small hydropower unit and the reference grid connection frequency range of the small hydropower unit's microgrid, and if the current frequency is not within the reference grid connection frequency range, the current water inflow and ambient water volume information of the small hydropower unit are acquired. Based on the frequency offset between the current frequency and the reference grid connection frequency range and the operating status information of the small hydropower unit's microgrid, a reference frequency adjustment parameter is determined. Based on the current water inflow and ambient water volume information, a frequency adjustment correction parameter is determined. The reference frequency adjustment parameter is then corrected using the frequency adjustment correction parameter to obtain the target frequency adjustment parameter. The small hydropower unit's frequency is adjusted using the target frequency adjustment parameter. Therefore, by combining the current frequency of the small hydropower unit, water inflow, ambient water volume, and the operating status information of the small hydropower unit's microgrid, the corresponding frequency adjustment parameter can be determined, improving the accuracy of frequency adjustment parameter determination. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This application provides a schematic flowchart of a grid frequency control method for a small hydropower unit. Figure 2 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application; Figure 3 This application provides a schematic diagram of the structure of a power grid frequency control device for a small hydropower unit. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0023] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0024] To better understand the power grid frequency control method for small hydropower units provided in this application, a brief introduction to the small hydropower unit microgrid applying this method is given below. A small hydropower unit microgrid can be understood as a regional power grid formed by small hydropower units. This regional power grid contains multiple small hydropower units, each of which can be understood as a small hydropower station. These power stations can be distributed across multiple river tributaries and typically generate electricity only during certain seasons. This is because, being located at river branches, they are significantly affected by weather conditions, with higher power generation during the rainy season and lower generation during the non-rainy season. Given these characteristics, corresponding power coordination control is required for the small hydropower unit microgrid to adapt to the needs of the power grid. In existing solutions, coordination control is usually performed directly using the real-time operating frequency of the small hydropower units, without considering the overall power generation performance of the microgrid, resulting in lower accuracy during coordination control.

[0025] Please see Figure 1 , Figure 1 This application provides a flowchart illustrating a grid frequency control method for small hydropower units. For example... Figure 1 As shown, the method includes: 101. Obtain the current frequency of the small hydropower unit and the reference grid access frequency range of the microgrid where the small hydropower unit is located.

[0026] The current frequency of the small hydropower unit can be understood as the grid frequency detected during frequency detection. The current frequency can also be the frequency of the small hydropower unit itself. The reference grid connection frequency range is a pre-set grid connection frequency range for the small hydropower unit microgrid. If the current frequency is within this range, grid connection can proceed. If the current frequency is not within this range, frequency adjustment is required to adjust it to the reference grid connection frequency range before grid connection.

[0027] 102. If the current frequency is not within the reference grid access frequency range, then obtain the current water inflow and environmental water flow information of the small hydropower unit.

[0028] The current inflow can be understood as the inflow velocity of water during the current power generation of the small hydropower unit. The environmental water volume information can be understood as the water volume information of the reservoir area where the small hydropower unit is located.

[0029] 103. Determine the reference frequency adjustment parameters based on the frequency offset between the current frequency and the reference grid access frequency range and the operating status information of the small hydropower unit microgrid.

[0030] Specifically, a sub-reference frequency adjustment parameter can be determined based on the frequency offset, another sub-reference frequency adjustment parameter can be determined based on the operating status information, and finally the two sub-reference frequency adjustment parameters are fused to obtain the reference frequency adjustment parameter.

[0031] 104. Determine the frequency adjustment and correction parameters based on the current water inflow and the environmental water volume information.

[0032] Reference correction parameters can be determined based on the current inflow and environmental water volume information. These two reference correction parameters are then fused to obtain the frequency regulation correction parameters. The frequency regulation correction parameters can be understood as parameters that correct the reference frequency regulation parameters, resulting in more accurate frequency regulation parameters.

[0033] 105. The reference frequency adjustment parameters are corrected using the frequency adjustment correction parameters to obtain the target frequency adjustment parameters.

[0034] In this method, the product of the frequency adjustment correction parameter and the reference frequency adjustment parameter can be used to determine the target frequency adjustment parameter, thereby achieving the correction process and improving the accuracy of the target frequency adjustment parameter.

[0035] 106. Use the target frequency adjustment parameters to adjust the frequency of the small hydropower unit.

[0036] Frequency regulation is achieved by superimposing the target frequency adjustment parameter with the current frequency of the small hydropower unit. During superposition, if the offset direction of the target frequency adjustment parameter is positive, the final frequency is obtained by subtracting the target frequency adjustment parameter from the current frequency of the small hydropower unit. If the offset direction is negative, the final frequency is obtained by adding the target frequency adjustment parameter to the current frequency of the small hydropower unit. A positive offset can be interpreted as the current frequency of the small hydropower unit being too high and needing to be reduced, while a negative offset can be interpreted as the current frequency of the small hydropower unit being too low and needing to be increased.

[0037] In this example, by obtaining the current frequency of the small hydropower unit and the reference grid connection frequency range of the small hydropower unit microgrid where the small hydropower unit is located, if the current frequency is not within the reference grid connection frequency range, the current water inflow and ambient water flow information of the small hydropower unit are obtained. Based on the frequency offset between the current frequency and the reference grid connection frequency range and the operating status information of the small hydropower unit microgrid, a reference frequency adjustment parameter is determined. Based on the current water inflow and ambient water flow information, a frequency adjustment correction parameter is determined. The reference frequency adjustment parameter is corrected using the frequency adjustment correction parameter to obtain the target frequency adjustment parameter. The small hydropower unit is then frequency-adjusted using the target frequency adjustment parameter. Therefore, the corresponding frequency adjustment parameter can be determined by combining the current frequency of the small hydropower unit, the water inflow, the ambient water flow, and the operating status information of the small hydropower unit microgrid, thus improving the accuracy of frequency adjustment parameter determination.

[0038] In one possible implementation, determining the frequency adjustment correction parameters based on the current inflow and the environmental water volume information includes: A1. Obtain the current inflow volume range; A2. Determine the first reference correction parameter based on the water inflow range; A3. Determine the second reference correction parameter based on the environmental water volume information; A4. The first reference correction parameter and the second reference correction parameter are fused together to obtain the frequency adjustment correction parameter.

[0039] In determining the first reference correction parameter, different inflow ranges correspond to different reference correction parameters, thus allowing the first reference correction parameter to be determined based on the current inflow range. Specifically, due to the different inflow ranges, the adjustment parameters will also differ. For example, as the inflow range increases from low to high, the correction parameter can be to increase the inflow when the inflow range is low, and to decrease the inflow when the inflow range is high. The specific increase or decrease in inflow is determined based on the specific inflow range.

[0040] In one possible implementation, determining the second reference correction parameter based on the environmental water quantity information includes: A31. Extract the current water level depth value based on the environmental water volume information; A32. Determine water storage and energy storage information based on the water level depth value; A33. Determine the second reference correction parameter based on the water storage and energy storage information.

[0041] The current water level depth indicates the current water volume; a higher water level depth indicates a larger water volume, and a lower water level depth indicates a smaller water volume. Furthermore, different water volumes correspond to different energy storage capacities. Larger water volumes indicate larger energy storage values, and smaller water volumes indicate smaller energy storage values. Therefore, the corresponding energy storage information can be determined based on the water level depth.

[0042] The larger the water storage energy information, the smaller the second reference correction parameter; conversely, the smaller the water storage energy information, the larger the second reference correction parameter. Specifically, a smaller second reference correction parameter indicates a smaller adjustment force during regulation, while a larger parameter indicates a larger adjustment force. The adjustment force can be understood as the adjustment value during frequency regulation; a larger adjustment force results in a larger adjustment value, and a smaller adjustment force results in a smaller adjustment value. Therefore, determining the corresponding second reference correction parameter based on the water storage energy information determined by the water level depth value can improve the accuracy of the second reference correction parameter determination.

[0043] In one possible implementation, a method for determining reference frequency adjustment parameters based on the frequency offset between the current frequency and the reference grid connection frequency interval and the operating status information of the small hydropower unit microgrid includes: C1. Determine the first sub-reference frequency adjustment parameter based on the frequency offset; C2. Obtain the offset direction information of the frequency offset; C3. Determine the second sub-reference frequency adjustment parameter based on the offset direction information and the first sub-reference frequency adjustment parameter; C4. Determine the third sub-reference frequency adjustment parameter based on the aforementioned operating status information; C5. The second sub-reference frequency adjustment parameter and the third sub-reference frequency adjustment parameter are fused together to obtain the reference frequency adjustment parameter.

[0044] Specifically, the first sub-reference frequency adjustment parameter is determined based on the preset mapping relationship between frequency offset and frequency adjustment parameters. More specifically, the larger the frequency offset, the larger the first sub-reference frequency adjustment parameter; conversely, the smaller the frequency offset, the smaller the first sub-reference frequency adjustment parameter.

[0045] The offset direction information can include positive offset and negative offset. Specifically, positive offset can be understood as the current frequency of the small hydropower unit being too high and needing to be reduced, while negative offset can be understood as the current frequency of the small hydropower unit being too low and needing to be increased.

[0046] The offset direction information and the first sub-reference frequency adjustment parameters can be combined into an array to obtain the second sub-reference frequency adjustment parameters. For example, the second sub-reference frequency adjustment parameters can be represented as (a, b), where a represents the offset direction information and b represents the first sub-reference frequency adjustment parameters.

[0047] Specifically, the method for determining the third reference frequency adjustment parameter based on the operating status information can be as follows: extract the operating fluctuation information and the output frequency information from the operating status information, determine the corresponding frequency adjustment parameters based on the operating fluctuation information and the output frequency information respectively, and finally fuse the two frequency adjustment parameters to obtain the third sub-reference frequency adjustment parameter.

[0048] The method for fusing the second and third sub-reference frequency adjustment parameters can be as follows: Perform a weighted calculation between the frequency adjustment parameters in the second and third sub-reference frequency adjustment parameters to obtain the corresponding frequency adjustment parameters. Then, use these corresponding frequency adjustment parameters to replace the frequency adjustment parameters in the second sub-reference frequency adjustment parameters to obtain the reference frequency adjustment parameters. The weights used for the weighted calculation are set based on empirical values ​​or historical data.

[0049] In one possible implementation, determining the third sub-reference frequency adjustment parameter based on the operating state information includes: D1. Extract the overall operational fluctuation information and output frequency information of the small hydropower unit microgrid from the operational status information; D2. Determine the fourth sub-reference frequency adjustment parameter based on the operational fluctuation information; D3. Perform frequency fluctuation analysis based on the output frequency information to obtain the frequency fluctuation analysis results; D4. Determine the fifth sub-reference frequency adjustment parameter based on the frequency fluctuation analysis results; D5. The fourth sub-reference frequency adjustment parameter and the fifth sub-reference frequency adjustment parameter are fused together to obtain the third sub-reference frequency adjustment parameter.

[0050] The operational fluctuation information can be understood as the overall operational state fluctuation information. State fluctuation information can include state stability fluctuation information. The fourth sub-reference frequency adjustment parameter can be determined based on a preset frequency adjustment parameter model. This preset frequency adjustment parameter model is a pre-trained model used for adjusting the fourth sub-reference frequency parameter, such as a CNN (Convolutional Neural Network) model.

[0051] When performing frequency fluctuation analysis, the variance of the frequency information can be extracted and used as the result of the frequency fluctuation analysis. The fifth sub-reference frequency adjustment parameter corresponding to the frequency fluctuation information can be determined using a lookup table method; different frequency fluctuation information corresponds to different fifth sub-reference frequency adjustment parameters. Finally, the fourth and fifth sub-reference frequency adjustment parameters can be fused using a weighted calculation method to obtain the third sub-reference frequency adjustment parameter. The weights used in the weighted calculation are set based on empirical values ​​or historical data.

[0052] For examples consistent with the above embodiments, please refer to... Figure 2 , Figure 2 A schematic diagram of a terminal structure provided in an embodiment of this application is shown in the figure. It includes a processor, an input device, an output device, and a memory. The processor, input device, output device, and memory are interconnected. The memory is used to store a computer program, which includes program instructions. The processor is configured to call the program instructions. The program includes instructions for performing the following steps. Obtain the current frequency of the small hydropower unit, and obtain the reference grid access frequency range of the microgrid where the small hydropower unit is located; If the current frequency is not within the reference grid access frequency range, then obtain the current water inflow and environmental water volume information of the small hydropower unit; The reference frequency adjustment parameters are determined based on the frequency offset between the current frequency and the reference grid access frequency range and the operating status information of the small hydropower unit microgrid. The frequency adjustment and correction parameters are determined based on the current water inflow and the environmental water volume information. The reference frequency adjustment parameters are corrected using the frequency adjustment correction parameters to obtain the target frequency adjustment parameters. The frequency of the small hydropower unit is regulated using the target frequency regulation parameters.

[0053] In this example, by obtaining the current frequency of the small hydropower unit and the reference grid connection frequency range of the small hydropower unit microgrid where the small hydropower unit is located, if the current frequency is not within the reference grid connection frequency range, the current water inflow and ambient water flow information of the small hydropower unit are obtained. Based on the frequency offset between the current frequency and the reference grid connection frequency range and the operating status information of the small hydropower unit microgrid, a reference frequency adjustment parameter is determined. Based on the current water inflow and ambient water flow information, a frequency adjustment correction parameter is determined. The reference frequency adjustment parameter is corrected using the frequency adjustment correction parameter to obtain the target frequency adjustment parameter. The small hydropower unit is then frequency-adjusted using the target frequency adjustment parameter. Therefore, the corresponding frequency adjustment parameter can be determined by combining the current frequency of the small hydropower unit, the water inflow, the ambient water flow, and the operating status information of the small hydropower unit microgrid, thus improving the accuracy of frequency adjustment parameter determination.

[0054] The above mainly describes the solutions of the embodiments of this application from the perspective of the method execution process. It is understood that, in order to achieve the above functions, the terminal includes the corresponding hardware structure and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments provided herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0055] This application embodiment can divide the terminal into functional units according to the above method example. For example, each function can be divided into a separate functional unit, or two or more functions can be integrated into one processing unit. The integrated unit can be implemented in hardware or as a software functional unit. It should be noted that the unit division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0056] For those consistent with the above, please refer to Figure 3 , Figure 3 This application provides a schematic diagram of the structure of a power grid frequency control device for a small hydropower unit. For example... Figure 3 As shown, the device includes: The acquisition unit 301 is used to acquire the current frequency of the small hydropower unit and the reference grid connection frequency range of the microgrid where the small hydropower unit is located; if the current frequency is not within the reference grid connection frequency range, the current water inflow and environmental water flow information of the small hydropower unit are acquired. The determining unit 302 is used to determine the reference frequency adjustment parameters based on the frequency offset between the current frequency and the reference grid connection frequency interval and the operating status information of the small hydropower unit microgrid; and to determine the frequency adjustment correction parameters based on the current water inflow and the environmental water flow information. The correction unit 303 is used to correct the reference frequency adjustment parameter using the frequency adjustment correction parameter to obtain the target frequency adjustment parameter; The adjustment unit 304 is used to adjust the frequency of the small hydropower unit using the target frequency adjustment parameters.

[0057] In this example, by obtaining the current frequency of the small hydropower unit and the reference grid connection frequency range of the small hydropower unit microgrid where the small hydropower unit is located, if the current frequency is not within the reference grid connection frequency range, the current water inflow and ambient water flow information of the small hydropower unit are obtained. Based on the frequency offset between the current frequency and the reference grid connection frequency range and the operating status information of the small hydropower unit microgrid, a reference frequency adjustment parameter is determined. Based on the current water inflow and ambient water flow information, a frequency adjustment correction parameter is determined. The reference frequency adjustment parameter is corrected using the frequency adjustment correction parameter to obtain the target frequency adjustment parameter. The small hydropower unit is then frequency-adjusted using the target frequency adjustment parameter. Therefore, the corresponding frequency adjustment parameter can be determined by combining the current frequency of the small hydropower unit, the water inflow, the ambient water flow, and the operating status information of the small hydropower unit microgrid, thus improving the accuracy of frequency adjustment parameter determination.

[0058] In one possible implementation, the determining unit 302 is specifically configured to: determine the frequency adjustment correction parameters based on the current inflow and the environmental water volume information; Get the current inflow volume range; The first reference correction parameter is determined based on the water inflow range; The second reference correction parameter is determined based on the environmental water volume information; The first reference correction parameter and the second reference correction parameter are fused together to obtain the frequency adjustment correction parameter.

[0059] In one possible implementation, in determining the second reference correction parameter based on the environmental water quantity information, the determining unit 302 is specifically configured to: Extract the current water level depth value based on the environmental water volume information; The water storage and energy storage information is determined based on the water level depth value; The second reference correction parameter is determined based on the water storage and energy storage information.

[0060] In one possible implementation, in determining the reference frequency adjustment parameters based on the frequency offset between the current frequency and the reference grid connection frequency interval and the operating status information of the small hydropower unit microgrid, the determining unit 302 is specifically used for: The first sub-reference frequency adjustment parameter is determined based on the frequency offset. Obtain the offset direction information of the frequency offset; The second sub-reference frequency adjustment parameter is determined based on the offset direction information and the first sub-reference frequency adjustment parameter; Based on the operating status information, determine the third sub-reference frequency adjustment parameters; The second sub-reference frequency adjustment parameter and the third sub-reference frequency adjustment parameter are fused together to obtain the reference frequency adjustment parameter.

[0061] In one possible implementation, in determining the third sub-reference frequency adjustment parameter based on the operating state information, the determining unit 302 is specifically used for: Extract the overall operational fluctuation information and output frequency information of the small hydropower unit microgrid from the operational status information; The fourth sub-reference frequency adjustment parameter is determined based on the operational fluctuation information; Frequency fluctuation analysis is performed based on the output frequency information to obtain the frequency fluctuation analysis results. The fifth sub-reference frequency adjustment parameters are determined based on the frequency fluctuation analysis results. The fourth and fifth sub-reference frequency adjustment parameters are fused together to obtain the third sub-reference frequency adjustment parameter.

[0062] This application also provides a computer storage medium storing a computer program for electronic data exchange, which causes a computer to perform some or all of the steps of a power grid frequency control method for any small hydropower unit as described in the above method embodiments.

[0063] This application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps of any of the grid frequency control methods for small hydropower units described in the above method embodiments.

[0064] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0067] 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 units can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] Furthermore, the functional units in the various embodiments of the application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software program module.

[0069] If the integrated unit is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory 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 this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0070] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage device, which may include: a flash drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk, etc.

[0071] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for grid frequency control of small hydroelectric generating units, characterized in that, The method comprises: acquiring a current frequency of a small hydropower unit and a reference grid-connection frequency interval of a small hydropower unit microgrid where the small hydropower unit is located; if the current frequency is not in the reference grid-connection frequency interval, acquiring current water inflow and environmental water inflow information of the small hydropower unit; determining a reference frequency adjustment parameter according to a frequency offset between the current frequency and the reference grid-connection frequency interval and operation state information of the small hydropower unit microgrid; determining a frequency adjustment correction parameter according to the current water inflow and the environmental water inflow information; correcting the reference frequency adjustment parameter using the frequency adjustment correction parameter to obtain a target frequency adjustment parameter; adjusting the frequency of the small hydropower unit using the target frequency adjustment parameter.

2. The grid frequency control method of the mini hydropower generating unit according to claim 1, characterized in that, The method of determining the frequency adjustment correction parameter according to the current water inflow and the environmental water inflow information comprises: acquiring a water inflow interval where the current water inflow is located; determining a first reference correction parameter according to the water inflow interval; determining a second reference correction parameter according to the environmental water inflow information; fusing the first reference correction parameter and the second reference correction parameter to obtain the frequency adjustment correction parameter.

3. The grid frequency control method of the mini hydropower generating unit according to claim 2, characterized in that, The method of determining the second reference correction parameter according to the environmental water inflow information comprises: extracting a current water depth value from the environmental water inflow information; determining water storage energy information according to the water depth value; determining the second reference correction parameter according to the water storage energy information.

4. The grid frequency control method of a mini hydro generator unit according to any one of claims 1-3, characterized in that, The method of determining the reference frequency adjustment parameter according to the frequency offset between the current frequency and the reference grid-connection frequency interval and the operation state information of the small hydropower unit microgrid comprises: determining a first sub-reference frequency adjustment parameter according to the frequency offset; acquiring offset direction information of the frequency offset; determining a second sub-reference frequency adjustment parameter according to the offset direction information and the first sub-reference frequency adjustment parameter; determining a third sub-reference frequency adjustment parameter according to the operation state information; fusing the second sub-reference frequency adjustment parameter and the third sub-reference frequency adjustment parameter to obtain the reference frequency adjustment parameter.

5. The grid frequency control method of the mini hydropower generating unit according to claim 4, characterized in that, The method of determining the third sub-reference frequency adjustment parameter according to the operation state information comprises: extracting small hydropower unit microgrid overall operation fluctuation information and output frequency information from the operation state information; determining a fourth sub-reference frequency adjustment parameter according to the operation fluctuation information; performing frequency fluctuation analysis according to the output frequency information to obtain a frequency fluctuation analysis result; determining a fifth sub-reference frequency adjustment parameter according to the frequency fluctuation analysis result; fusing the fourth sub-reference frequency adjustment parameter and the fifth sub-reference frequency adjustment parameter to obtain the third sub-reference frequency adjustment parameter.

6. A grid frequency control device for small hydroelectric generating units, characterized by The apparatus comprises: an acquisition unit configured to acquire a current frequency of a small hydropower unit and a reference grid-connection frequency interval of a small hydropower unit microgrid where the small hydropower unit is located; if the current frequency is not in the reference grid-connection frequency interval, acquire current water inflow and environmental water inflow information of the small hydropower unit; A determining unit is configured to determine a reference frequency adjustment parameter according to a frequency offset between the current frequency and the reference network access frequency interval and operation state information of the micro-grid of the small hydropower generator set; determine a frequency adjustment correction parameter according to the current water inflow and the environmental water inflow information; A correction unit is configured to correct the reference frequency adjustment parameter by using the frequency adjustment correction parameter to obtain a target frequency adjustment parameter; An adjustment unit is configured to use the target frequency adjustment parameter to perform frequency adjustment on the small hydropower generator set.

7. The grid frequency control device for small hydro generating units as claimed in claim 6 wherein, In the aspect of determining the frequency adjustment correction parameter according to the current water inflow and the environmental water inflow information, the determining unit is specifically configured to: obtain a water inflow interval in which the current water inflow is located; determine a first reference correction parameter according to the water inflow interval; determine a second reference correction parameter according to the environmental water inflow information; fuse the first reference correction parameter and the second reference correction parameter to obtain the frequency adjustment correction parameter.

8. The grid frequency control device for small hydro generating units as claimed in claim 7 wherein, In the aspect of determining the second reference correction parameter according to the environmental water inflow information, the determining unit is specifically configured to: extract a current water level value from the environmental water inflow information; determine water storage energy storage information according to the water level value; determine the second reference correction parameter according to the water storage energy storage information.

9. A terminal, characterized by comprising: A device includes a processor, an input device, an output device and a memory, which are connected to each other, wherein the memory is configured to store a computer program, the computer program includes program instructions, and the processor is configured to invoke the program instructions to execute the method for grid frequency control of a small hydropower generator set according to any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the method for grid frequency control of a small hydropower generator set according to any one of claims 1-5.

Images