A method and system for dynamically obtaining optimal rotating speed of a variable rotating speed hydroelectric generating set

Abstract

This invention discloses a method and system for dynamically obtaining the optimal speed of a variable-speed hydropower unit. The method includes: obtaining the current speed of the target variable-speed hydropower unit based on its output setpoint and head; setting a disturbance correction value for the current speed; perturbing the speed of the target variable-speed hydropower unit according to the disturbance correction value and obtaining the guide vane opening after the disturbance; obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance; if the difference is zero, then the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamically optimal speed output. This solves the problem that the accuracy of the unit speed setpoint is insufficient, affecting the actual operating efficiency of the unit, due to differences in characteristics between the model turbine and the prototype turbine caused by factors such as the scale effect.

Description

Technical Field

[0001] This invention relates to the field of dynamic acquisition of optimal speed of variable speed hydropower units, and in particular to a method and system for dynamic acquisition of optimal speed of variable speed hydropower units. Background Technology

[0002] Variable speed hydropower units have advantages such as fast load response, strong adjustment capability, and high operating efficiency, and have attracted great attention in the industry. Unlike conventional constant speed hydropower units, the speed of variable speed hydropower units can be continuously adjusted during operation.

[0003] The current speed setpoint is calculated from the comprehensive characteristic data of the model turbine obtained from the model turbine test. However, due to factors such as the scale effect, there are certain differences between the characteristics of the model turbine and the prototype turbine, resulting in insufficient accuracy of the unit speed setpoint and affecting the actual operating efficiency of the unit. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the aforementioned existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a method and system for dynamically obtaining the optimal speed of a variable speed hydropower unit, which can solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for dynamically obtaining the optimal speed of a variable-speed hydropower unit, comprising:

[0008] Based on the output setpoint of the target variable speed hydropower unit and the unit head, obtain the current speed of the target variable speed hydropower unit;

[0009] A disturbance correction value is set for the current unit speed of the target variable speed hydropower unit. The speed of the target variable speed hydropower unit is disturbed according to the disturbance correction value, and the guide vane opening after disturbance is obtained.

[0010] Obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, then the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0011] As a preferred embodiment of the method for dynamically obtaining the optimal speed of a variable-speed hydropower unit according to the present invention, the step of obtaining the current speed of the target variable-speed hydropower unit based on the output setpoint and the unit head includes:

[0012] Based on the known output setpoint P of the target variable speed hydropower unit, the unit head H of the target variable speed hydropower unit, and the rated speed of the target variable speed hydropower unit, the efficiency η of the target variable speed hydropower unit is calculated.

[0013] The current speed n of the target variable speed hydropower unit is calculated based on the efficiency η and the output P of the target variable speed hydropower unit.

[0014]

[0015] Where P is the output setpoint of the target variable speed hydropower unit, η is the efficiency of the target variable speed hydropower unit, and n is the current speed of the target variable speed hydropower unit.

[0016] As a preferred embodiment of the method for dynamically obtaining the optimal speed of a variable-speed hydropower unit according to the present invention, the step of setting a disturbance correction value for the current unit speed of the target variable-speed hydropower unit, disturbing the speed of the target variable-speed hydropower unit according to the disturbance correction value, and obtaining the guide vane opening after disturbance includes,

[0017] Let the disturbance correction value be Δn, the current unit speed of the target variable speed hydropower unit be n, and the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit be y.

[0018] If the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is less than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit for disturbance.

[0019] If the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is greater than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, then the disturbance is performed by subtracting the disturbance correction value from the current unit speed of the target variable speed hydropower unit.

[0020] When the target variable speed hydropower unit is disturbed by adding a disturbance correction value to the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as y1.

[0021] When the target variable speed hydropower unit is disturbed by adding a disturbance correction value to the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as Y1.

[0022] After each disturbance, the guide vane opening at the corresponding rotational speed must be calculated.

[0023] As a preferred embodiment of the method for dynamically obtaining the optimal speed of a variable-speed hydropower unit according to the present invention, the step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0024] When a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit, the new unit speed is n+Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as y1.

[0025] Determine the relationship between the new guide vane opening y1 and y. If the new guide vane opening y1 is less than y, continue to increase the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as y2.

[0026] If the new guide vane opening y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Take Δn / 2 as the new disturbance correction value and perform reverse disturbance. At this time, the speed decreases by Δn / 2. Obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, and record it as y3.

[0027] Perform the iterative solution until a new guide vane opening y is reached. i Equal to y, outputting the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed, where i represents the number of disturbances.

[0028] As a preferred embodiment of the method for dynamically obtaining the optimal speed of a variable-speed hydropower unit according to the present invention, the step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, further includes...

[0029] After the disturbance correction value is subtracted from the current unit speed of the target variable speed hydropower unit, the new unit speed is n-Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as Y1.

[0030] Determine the relationship between the new guide vane opening Y1 and y. If the new guide vane opening Y1 is less than y, continue to reduce the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as Y2.

[0031] If the new guide vane opening Y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Take △n / 2 as the new disturbance correction value and perform reverse disturbance. At this time, the speed increases by △n / 2. Obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, and record it as Y3.

[0032] Perform the iterative solution until a new guide vane opening Y is reached. i Equal to y, output the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed.

[0033] As a preferred embodiment of the method for dynamically obtaining the optimal speed of a variable-speed hydropower unit according to the present invention, the step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, further includes...

[0034] If the new guide vane opening is greater than y, the disturbance correction value becomes half of the disturbance correction value of the previous disturbance, and the disturbance direction is opposite to that of the previous disturbance.

[0035] If the new guide vane opening is less than y, the disturbance correction value becomes the same as the disturbance correction value in the previous round of disturbance, and the disturbance direction is the same as in the previous round of disturbance.

[0036] As a preferred embodiment of the dynamic acquisition method for the optimal speed of a variable-speed hydropower unit according to the present invention, the step of acquiring the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, further includes determining that the new guide vane opening is equal to y if the difference between the new guide vane opening and y is less than 0.1% or the disturbance correction value is less than Δn / 256.

[0037] A dynamic optimal speed acquisition system for a variable-speed hydropower unit, characterized by comprising: a speed acquisition module, a disturbance module, and a judgment module.

[0038] The speed acquisition module is used to acquire the current speed of the target variable speed hydropower unit based on the output setpoint of the target variable speed hydropower unit and the unit head.

[0039] The disturbance module is used to set a disturbance correction value for the current unit speed of the target variable speed hydropower unit, disturb the speed of the target variable speed hydropower unit according to the disturbance correction value, and obtain the guide vane opening after disturbance.

[0040] The judgment module is used to obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0041] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of the method described above.

[0042] A computer-readable storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, implements the steps of the method described above.

[0043] The beneficial effects of this invention are as follows: This invention proposes a method and system for dynamically obtaining the optimal speed of a variable-speed hydropower unit. Based on the output setpoint and head of the target variable-speed hydropower unit, the current speed of the target variable-speed hydropower unit is obtained. A disturbance correction value is set for the current speed of the target variable-speed hydropower unit. The speed of the target variable-speed hydropower unit is disturbed according to the disturbance correction value, and the guide vane opening after the disturbance is obtained. The difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamically optimal speed output. This solves the problem that the difference between the characteristics of the model turbine and the prototype turbine due to factors such as the scale effect leads to insufficient accuracy of the unit speed setpoint, affecting the actual operating efficiency of the unit. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0045] Figure 1 A flowchart of a method and system for dynamically obtaining the optimal speed of a variable-speed hydropower unit, provided in one embodiment of the present invention;

[0046] Figure 2 A speed governor control block diagram of a method and system for dynamically obtaining the optimal speed of a variable speed hydropower unit, provided in one embodiment of the present invention;

[0047] Figure 3 This is an internal structural diagram of a computer device for a method and system for dynamically obtaining the optimal speed of a variable-speed hydropower unit, provided in one embodiment of the present invention. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0049] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0050] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0051] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0052] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Example 1

[0055] Reference Figure 1-3This is the first embodiment of the present invention, which provides a method and system for dynamically obtaining the optimal speed of a variable-speed hydropower unit, comprising:

[0056] Based on the output setpoint of the target variable speed hydropower unit and the unit head, obtain the current speed of the target variable speed hydropower unit;

[0057] Specifically, based on the known output setpoint P of the target variable speed hydropower unit, the unit head H of the target variable speed hydropower unit, and the rated speed of the target variable speed hydropower unit, the efficiency η of the target variable speed hydropower unit is calculated.

[0058] Furthermore, based on the efficiency η of the target variable speed hydropower unit and the output P of the target variable speed hydropower unit, the current speed n of the target variable speed hydropower unit is calculated.

[0059]

[0060] Where P is the output setpoint of the target variable speed hydropower unit, η is the efficiency of the target variable speed hydropower unit, and n is the current speed of the target variable speed hydropower unit.

[0061] In an optional embodiment, the speed governor can also be configured based on the unit power setpoint P. r With unit head H t The initial optimal speed is obtained by looking up the table of the relationship between the optimal speed and the unit head and power setpoint in the speed governor, and the optimal speed is output to the control strategy stage. The new guide vane opening is obtained through the control strategy.

[0062] Set a disturbance correction value for the current unit speed of the target variable speed hydropower unit, disturb the speed of the target variable speed hydropower unit according to the disturbance correction value, and obtain the guide vane opening after disturbance;

[0063] Furthermore, the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0064] Specifically, a disturbance correction value is set for the current unit speed of the target variable-speed hydropower unit; the speed of the target variable-speed hydropower unit is disturbed according to the disturbance correction value; and the guide vane opening after disturbance is obtained.

[0065] Let the disturbance correction value be Δn, the current unit speed of the target variable speed hydropower unit be n, and the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit be y.

[0066] It should be noted that if the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is less than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit for disturbance.

[0067] It should be noted that if the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is greater than half the maximum value of the guide vane opening of the target variable speed hydropower unit, the disturbance should be applied by subtracting the disturbance correction value from the current unit speed of the target variable speed hydropower unit.

[0068] It should be noted that when the target variable speed hydropower unit is disturbed by adding a disturbance correction value to the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as y1.

[0069] It should be noted that when the target variable speed hydropower unit is disturbed by adding a disturbance correction value to the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as Y1.

[0070] It should be noted that after each disturbance, the guide vane opening at the corresponding rotational speed after the disturbance must be calculated.

[0071] Furthermore, the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0072] When a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit, the new unit speed is n+Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as y1.

[0073] Furthermore, determine the relationship between the new guide vane opening y1 and y. If the new guide vane opening y1 is less than y, continue to increase the disturbance correction value to disturb, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, denoted as y2.

[0074] It should be noted that if the new guide vane opening y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Δn / 2 is taken as the new disturbance correction value, and a reverse disturbance is performed. At this time, the speed decreases by Δn / 2. The guide vane opening corresponding to the unit speed after the new round of disturbance is obtained and recorded as y3.

[0075] Furthermore, the solution is iterated until a new guide vane opening y is achieved. i Equal to y, outputting the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed, where i represents the number of disturbances.

[0076] Furthermore, the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0077] After the disturbance correction value is subtracted from the current unit speed of the target variable speed hydropower unit, the new unit speed is n-Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as Y1.

[0078] Determine the relationship between the new guide vane opening Y1 and y. If the new guide vane opening Y1 is less than y, continue to reduce the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as Y2.

[0079] It should be noted that if the new guide vane opening Y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Δn / 2 is taken as the new disturbance correction value, and a reverse disturbance is performed. At this time, the speed increases by Δn / 2. The guide vane opening corresponding to the unit speed after the new round of disturbance is obtained and denoted as Y3.

[0080] Furthermore, the solution is iterated until a new guide vane opening Y is achieved. i Equal to y, output the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed.

[0081] Furthermore, the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0082] It should be noted that if the new guide vane opening is greater than y, the disturbance correction value becomes half of the disturbance correction value of the previous round of disturbance, and the disturbance direction is opposite to that of the previous round of disturbance.

[0083] It should be noted that if the new guide vane opening is less than y, the disturbance correction value becomes the same as the disturbance correction value in the previous round of disturbance, and the disturbance direction is the same as in the previous round of disturbance.

[0084] Furthermore, the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output. In addition, if the difference between the new guide vane opening and y is less than 0.1% or the disturbance correction value is less than Δn / 256, the new guide vane opening is considered to be equal to y.

[0085] In summary, this invention proposes a method for dynamically obtaining the optimal speed of a variable-speed hydropower unit. Based on the output setpoint and head of the target variable-speed hydropower unit, the current speed of the target variable-speed hydropower unit is obtained. A disturbance correction value is set for the current speed of the target variable-speed hydropower unit, and the speed is disturbed according to the disturbance correction value. The guide vane opening after each disturbance is obtained. The difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance is obtained. If the difference is zero, the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamically optimal speed output. This solves the problem that the difference between the characteristics of the model turbine and the prototype turbine due to factors such as the scale effect leads to insufficient accuracy of the unit speed setpoint, affecting the actual operating efficiency of the unit.

[0086] In a preferred embodiment, a dynamic optimal speed acquisition system for a variable-speed hydropower unit includes a speed acquisition module, a disturbance module, and a judgment module.

[0087] The speed acquisition module is used to acquire the current speed of the target variable speed hydropower unit based on the output setpoint of the target variable speed hydropower unit and the unit head.

[0088] The disturbance module is used to set a disturbance correction value for the current unit speed of the target variable speed hydropower unit, disturb the speed of the target variable speed hydropower unit according to the disturbance correction value, and obtain the guide vane opening after disturbance.

[0089] The judgment module is used to obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0090] The above-mentioned unit modules can be embedded in the processor of the computer device in hardware form or independent of it, or they can be stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of the above modules.

[0091] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 3As shown, the computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for dynamically obtaining the optimal speed of a variable-speed hydroelectric generator. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0092] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0093] Based on the output setpoint of the target variable speed hydropower unit and the unit head, obtain the current speed of the target variable speed hydropower unit;

[0094] Set a disturbance correction value for the current unit speed of the target variable speed hydropower unit, disturb the speed of the target variable speed hydropower unit according to the disturbance correction value, and obtain the guide vane opening after disturbance;

[0095] Obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, then the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0096] Example 2

[0097] Reference Figure 2 As an embodiment of the present invention, a method and system for dynamically obtaining the optimal speed of a variable speed hydropower unit are provided. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0098] Experimental objective: To verify the effectiveness and superiority of the method and system for dynamically obtaining the optimal speed of a variable-speed hydropower unit as described in this invention.

[0099] Experimental conditions: A hydropower station with an installed capacity of 100MW was selected as the experimental site. The guide vane opening ranged from 0 to 100%, and the head ranged from 80 to 120m during the experiment.

[0100] Experimental steps:

[0101] 1. Based on the output setpoint of the target variable speed hydropower unit and the unit head, obtain the current speed of the target variable speed hydropower unit;

[0102] 2. Set a disturbance correction value for the current unit speed of the target variable speed hydropower unit, disturb the speed of the target variable speed hydropower unit according to the disturbance correction value, and obtain the guide vane opening after disturbance;

[0103] 3. Obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance is taken as the dynamic optimal speed output.

[0104] The experimental results are shown in Table 1:

[0105]

[0106] It should be noted that, through multiple experiments, it was found that the invention can accurately and quickly obtain the optimal speed of the variable speed hydropower unit, and it is consistent with the actual operating conditions, thus having great practicality and promotional value.

[0107] Experimental Analysis: By comparing the traditional method with the method of this invention, it was found that the present invention has higher accuracy and response speed, and can better adapt to the operating requirements of variable speed hydropower units. Furthermore, this invention can be optimized according to different output setpoints and head conditions, demonstrating excellent adaptability and scalability.

[0108] Conclusion: Through experimental verification, the method and system for dynamically obtaining the optimal speed of variable-speed hydropower units of the present invention have high practicality and promotion value. It can accurately and quickly obtain the optimal speed of variable-speed hydropower units, providing strong technical support for the optimized operation of hydropower stations.

[0109] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0110] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0111] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0112] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0113] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0114] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0115] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for dynamically obtaining the optimal speed of a variable-speed hydropower unit, characterized in that: include, Based on the output setpoint of the target variable speed hydropower unit and the unit head, obtain the current speed of the target variable speed hydropower unit; A disturbance correction value is set for the current unit speed of the target variable speed hydropower unit. The speed of the target variable speed hydropower unit is disturbed according to the disturbance correction value, and the guide vane opening after disturbance is obtained. Obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, then take the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output. The steps of setting a disturbance correction value for the current unit speed of the target variable-speed hydropower unit, disturbing the speed of the target variable-speed hydropower unit according to the disturbance correction value, and obtaining the guide vane opening after disturbance include: Let the disturbance correction value be Δn, the current unit speed of the target variable speed hydropower unit be n, and the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit be y. If the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is less than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit for disturbance. If the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is greater than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, then the disturbance is performed by subtracting the disturbance correction value from the current unit speed of the target variable speed hydropower unit. When the target variable speed hydropower unit is disturbed by adding a disturbance correction value to the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as y1. After the target variable speed hydropower unit is disturbed by reducing the disturbance correction value based on the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as Y1. After each disturbance, the guide vane opening at the corresponding rotational speed after the disturbance must be calculated. The step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, includes... When a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit, the new unit speed is n+Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as y1. Determine the relationship between the new guide vane opening y1 and y. If the new guide vane opening y1 is less than y, continue to increase the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as y2. If the new guide vane opening y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Take Δn / 2 as the new disturbance correction value and perform reverse disturbance. At this time, the speed decreases by Δn / 2. Obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, and record it as y3. Perform the iterative solution until a new guide vane opening y is reached. i Equal to y, output the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed, where i represents the number of disturbances; The step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, also includes... After the disturbance correction value is subtracted from the current unit speed of the target variable speed hydropower unit, the new unit speed is n-Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as Y1. Determine the relationship between the new guide vane opening Y1 and y. If the new guide vane opening Y1 is less than y, continue to reduce the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as Y2. If the new guide vane opening Y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Take △n / 2 as the new disturbance correction value and perform reverse disturbance. At this time, the speed increases by △n / 2. Obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, and record it as Y3. Perform the iterative solution until a new guide vane opening Y is reached. i Equal to y, output the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed.

2. The method for dynamically obtaining the optimal speed of a variable-speed hydropower unit as described in claim 1, characterized in that: The step of obtaining the current speed of the target variable-speed hydropower unit based on the output setpoint and the unit head includes... Based on the known output setpoint P of the target variable speed hydropower unit, the unit head H of the target variable speed hydropower unit, and the rated speed of the target variable speed hydropower unit, the efficiency η of the target variable speed hydropower unit is calculated. The current speed n of the target variable speed hydropower unit is calculated based on the efficiency η and the output P of the target variable speed hydropower unit. Where P is the output setpoint of the target variable speed hydropower unit, η is the efficiency of the target variable speed hydropower unit, and n is the current speed of the target variable speed hydropower unit.

3. The method for dynamically obtaining the optimal speed of a variable-speed hydropower unit as described in claim 2, characterized in that: The step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, also includes... If the new guide vane opening is greater than y, the disturbance correction value becomes half of the disturbance correction value of the previous disturbance, and the disturbance direction is opposite to that of the previous disturbance. If the new guide vane opening is less than y, the disturbance correction value becomes the same as the disturbance correction value in the previous round of disturbance, and the disturbance direction is the same as in the previous round of disturbance.

4. The method for dynamically obtaining the optimal speed of a variable-speed hydropower unit as described in claim 3, characterized in that: The step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, also includes determining that the new guide vane opening is equal to y if the difference between the new guide vane opening and y is less than 0.1% or the disturbance correction value is less than Δn / 256.

5. A system for dynamically acquiring the optimal speed of a variable-speed hydropower unit, characterized in that: It includes a speed acquisition module, a disturbance module, and a judgment module. The speed acquisition module is used to acquire the current speed of the target variable speed hydropower unit based on the output setpoint of the target variable speed hydropower unit and the unit head. The disturbance module is used to set a disturbance correction value for the current unit speed of the target variable-speed hydropower unit, disturb the speed of the target variable-speed hydropower unit according to the disturbance correction value, and obtain the guide vane opening after disturbance. The steps of setting the disturbance correction value for the current unit speed of the target variable-speed hydropower unit, disturbing the speed of the target variable-speed hydropower unit according to the disturbance correction value, and obtaining the guide vane opening after disturbance include... Let the disturbance correction value be Δn, the current unit speed of the target variable speed hydropower unit be n, and the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit be y. If the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is less than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit for disturbance. If the guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is greater than half of the maximum value of the guide vane opening of the target variable speed hydropower unit, then the disturbance is performed by subtracting the disturbance correction value from the current unit speed of the target variable speed hydropower unit. When the target variable speed hydropower unit is disturbed by adding a disturbance correction value to the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as y1. After the target variable speed hydropower unit is disturbed by reducing the disturbance correction value based on the current unit speed, the guide vane opening corresponding to the new target variable speed hydropower unit current unit speed is recorded as Y1. After each disturbance, the guide vane opening at the corresponding rotational speed after the disturbance must be calculated. The judgment module is used to obtain the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance. If the difference is zero, the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance is output as the dynamically optimal speed. The process of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then outputting the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamically optimal speed includes... When a disturbance correction value is added to the current unit speed of the target variable speed hydropower unit, the new unit speed is n+Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as y1. Determine the relationship between the new guide vane opening y1 and y. If the new guide vane opening y1 is less than y, continue to increase the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as y2. If the new guide vane opening y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Take Δn / 2 as the new disturbance correction value and perform reverse disturbance. At this time, the speed decreases by Δn / 2. Obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, and record it as y3. Perform the iterative solution until a new guide vane opening y is reached. i Equal to y, output the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed, where i represents the number of disturbances; The step of obtaining the difference between the guide vane opening after each disturbance and the guide vane opening after the previous disturbance, and if the difference is zero, then taking the target variable-speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed output, also includes... After the disturbance correction value is subtracted from the current unit speed of the target variable speed hydropower unit, the new unit speed is n-Δn. The guide vane opening corresponding to the current unit speed of the target variable speed hydropower unit is recorded as Y1. Determine the relationship between the new guide vane opening Y1 and y. If the new guide vane opening Y1 is less than y, continue to reduce the disturbance correction value to perform disturbance, and obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, which is denoted as Y2. If the new guide vane opening Y2 is greater than y, the disturbance correction value corresponding to the unit state is too large. Take △n / 2 as the new disturbance correction value and perform reverse disturbance. At this time, the speed increases by △n / 2. Obtain the guide vane opening corresponding to the unit speed after the new round of disturbance, and record it as Y3. Perform the iterative solution until a new guide vane opening Y is reached. i Equal to y, output the target variable speed hydropower unit speed corresponding to the guide vane opening after this disturbance as the dynamic optimal speed.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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