Large capacity water turbine unit and operation control method thereof

Abstract

The present application provides a large-capacity water turbine unit and an operation control method thereof, belonging to the field of automatic control technology. The large-capacity water turbine unit comprises N groups of turbine blades, N is an integer greater than 1, and the N groups of turbine blades are arranged in sequence along the same center line, and the center line is parallel to the water flow direction. The method is applied to a control device of the large-capacity water turbine unit, and the method comprises: the control device determines that the turbine blades currently to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades in the N groups of turbine blades, and i is an integer ranging from 1 to N-1; the control device adjusts the coupling degree of the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, and the coupling degree of the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotation speed of the i+1-th group of turbine blades.

Description

Technical Field

[0001] The present application relates to the field of data processing, and in particular to a large-capacity water turbine unit and an operation control method thereof. Background Art

[0002] Large-capacity hydro turbine units refer to generator sets driven by water turbines, with a wide range of capacity and speed. With the optimization of the production structure of power equipment, the design of hydro turbine generator sets is increasingly developing towards high head, high speed, high efficiency and large capacity. In terms of key technologies of hydro turbine units, they include fluid dynamic lubrication of sliding bearings, ventilation and cooling system structure, and efficient and stable runners. In addition, the time required for starting and connecting to the grid for hydro turbine generator sets is short, and the operation and scheduling are flexible, making them suitable as peak-shaving units and emergency standby units. The maximum capacity of hydro turbine generator sets has reached 700,000 kilowatts. The development of large-capacity hydro turbine generator sets focuses on reliability because it is closely related to the economic benefits of hydropower plants. For units of 600MVA or 800MVA level, failures and tripping have a significant impact on the power system, power production and operation planning, so the reliability requirements of the units are the highest.

[0003] However, with the application of intelligent control, the control of large-capacity turbine units needs to be sophisticated and more dynamic, so this is also a hot topic in current research. Summary of the invention

[0004] The embodiment of the present application provides a large-capacity water turbine unit and an operation control method thereof, and adopts the following technical solutions:

[0005] In a first aspect, a method for controlling the operation of a large-capacity water turbine unit is provided, the large-capacity water turbine unit comprising N groups of turbine blades, N being an integer greater than 1, the N groups of turbine blades being arranged in sequence along the same center line, the center line being parallel to the direction of water flow, the method being applied to a control device of the large-capacity water turbine unit, the method comprising: the control device determining that the turbine blades currently to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades in the N groups of turbine blades, i being an integer ranging from 1 to N-1, the i-th group of turbine blades being located in the i-th cavity, the i+1-th group of turbine blades being located in the i-th cavity The turbine blades are located in the i+1th cavity, the i-th cavity is located above the i+1th cavity, the i-th blade group is arranged between the i-th cavity and the i+1th cavity, and the i-th blade group can change the degree of connectivity between the i-th cavity and the i+1th cavity accordingly by changing the opening degree; the control device adjusts the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, and the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotational speed of the i+1-th group of turbine blades.

[0006] Optionally, the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among N groups of turbine blades, including: the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among N groups of turbine blades based on the current electric energy demand, wherein the current electric energy demand is positively correlated with the value of i.

[0007] Optionally, the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the change in the opening of the i-th blade group, including: the control device controls the opening of the i-th blade group to increase from a first opening to a second opening according to the current electric energy demand increasing from a first preset value to a second preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

[0008] Optionally, a leakage hole is provided on the side wall of the i-th cavity between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, the water flow impacts the i-th cavity to drive the i-th group of turbine blades to rotate and then flows out from the leakage hole. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method also includes: the control device reduces the aperture of the leakage hole from a first aperture to a second aperture according to the opening of the i-th blade group increasing from the first opening to the second opening, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole, and the reduction of the aperture of the leakage hole from the first aperture to the second aperture can increase the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

[0009] Optionally, the connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction away from the center line of the annular structure, so that the opening of the i-th blade group increases from a first opening to a second opening.

[0010] Optionally, the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the change in the opening of the i-th blade group, including: the control device controls the opening of the i-th blade group to decrease from the second opening to the first opening according to the current electric energy demand being reduced from the second preset value to the first preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

[0011] Optionally, a leakage hole is provided on the side wall of the i-th cavity between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, the water flow impacts the i-th cavity to drive the i-th group of turbine blades to rotate and then flows out from the leakage hole. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method also includes: the control device increases the aperture of the leakage hole from the second aperture to the first aperture according to the opening of the i-th blade group decreasing from the second opening to the first opening, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole, and the increase in the aperture of the leakage hole from the second aperture to the first aperture can reduce the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

[0012] Optionally, the connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction close to the center line of the annular structure, so that the opening of the i-th blade group decreases from the second opening to the first opening.

[0013] Optionally, the cross-sectional shape of each blade in the i-th blade group is triangular, so that the angle between the surface of each blade facing the i-th group of turbine blades and the flow direction of the water flow is less than 90°.

[0014] In a second aspect, an operation control system of a large-capacity water turbine unit is provided, the system comprising a large-capacity water turbine unit comprising N groups of turbine blades, N being an integer greater than 1, the N groups of turbine blades being arranged in sequence along the same center line, the center line being parallel to the direction of water flow, the system further comprising a control device of the large-capacity water turbine unit, the system being configured as follows: the control device determines that the turbine blades currently to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades in the N groups of turbine blades, i being an integer ranging from 1 to N-1, the i-th group of turbine blades being located in the i-th cavity In the body, the i+1th group of turbine blades is located in the i+1th cavity, the i-th cavity is located above the i+1th cavity, and a blade group is arranged between the i-th cavity and the i+1th cavity. The blade group can change the degree of connectivity between the i-th cavity and the i+1th cavity accordingly by changing the opening degree; the control device adjusts the coupling degree between the i-th group of turbine blades and the i+1th group of turbine blades by controlling the opening degree change of the blade group, and the coupling degree between the i-th group of turbine blades and the i+1th group of turbine blades is positively correlated with the rotational speed of the i+1th group of turbine blades.

[0015] Optionally, the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among N groups of turbine blades, including: the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among N groups of turbine blades based on the current electric energy demand, wherein the current electric energy demand is positively correlated with the value of i.

[0016] Optionally, the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the change in the opening of the i-th blade group, including: the control device controls the opening of the i-th blade group to increase from a first opening to a second opening according to the current electric energy demand increasing from a first preset value to a second preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

[0017] Optionally, a leakage hole is provided on the side wall of the i-th cavity between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, the water flow impacts the i-th cavity to drive the i-th group of turbine blades to rotate and then flows out from the leakage hole. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method also includes: the control device reduces the aperture of the leakage hole from a first aperture to a second aperture according to the opening of the i-th blade group increasing from the first opening to the second opening, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole, and the reduction of the aperture of the leakage hole from the first aperture to the second aperture can increase the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

[0018] Optionally, the connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction away from the center line of the annular structure, so that the opening of the i-th blade group increases from a first opening to a second opening.

[0019] Optionally, the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the change in the opening of the i-th blade group, including: the control device controls the opening of the i-th blade group to decrease from the second opening to the first opening according to the current electric energy demand being reduced from the second preset value to the first preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

[0020] Optionally, a leakage hole is provided on the side wall of the i-th cavity between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, the water flow impacts the i-th cavity to drive the i-th group of turbine blades to rotate and then flows out from the leakage hole. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method also includes: the control device increases the aperture of the leakage hole from the second aperture to the first aperture according to the opening of the i-th blade group decreasing from the second opening to the first opening, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole, and the increase in the aperture of the leakage hole from the second aperture to the first aperture can reduce the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

[0021] Optionally, the connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction close to the center line of the annular structure, so that the opening of the i-th blade group decreases from the second opening to the first opening.

[0022] Optionally, the cross-sectional shape of each blade in the i-th blade group is triangular, so that the angle between the surface of each blade facing the i-th group of turbine blades and the flow direction of the water flow is less than 90°.

[0023] In a third aspect, a computer-readable storage medium is provided, comprising: a computer program or instructions; when the computer program or instructions are executed on a computer, the computer is caused to execute the method described in the first aspect.

[0024] In summary, based on the above method and system, it can be known that the control device can determine that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among the N groups of turbine blades, thereby adjusting the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, and the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotational speed of the i+1-th group of turbine blades, so as to achieve dynamic control of the rotational speed of the i+1-th group of turbine blades through the coupling of the i-th group of turbine blades and the i+1-th group of turbine blades, thereby achieving more precise and dynamic adjustment of the power generation power. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the operation control system of a large-capacity hydro turbine unit;

[0026] Figure 2 The structure diagram of a large-capacity turbine unit Figure 1 ;

[0027] Figure 3 The structure diagram of a large-capacity turbine unit Figure 2;

[0028] Figure 4 A schematic diagram of a flow chart of an operation control method of a large-capacity water turbine unit provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a control device provided in an embodiment of the present application.

[0030] Description of Reference Numerals

[0031] 11-the i-th cavity, 12-the i+1-th cavity, 13-the leakage hole, 21-the i-th group of turbine blades, 22-the i+1-th group of turbine blades, 30-the connecting part, 31-the i-th blade group, 32-the annular snap-fit ​​part, 33-the limiting groove, 34-the limiting part, 35-the circular hole. DETAILED DESCRIPTION

[0032] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0033] In the embodiments of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved by means of the arrangement order of each piece of information agreed in advance (for example, specified by the protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common parts of each piece of information can also be identified and indicated uniformly to reduce the indication overhead caused by indicating the same information separately.

[0034] In addition, the specific indication method may also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can refer to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, different indication methods may be used for different information. In the specific implementation process, the desired indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

[0035] It should be understood that the information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in the embodiment of the present application. Among them, the sending period and / or sending time of these sub-information can be pre-defined, for example, pre-defined according to a protocol, or can be configured by the sending end device by sending configuration information to the receiving end device.

[0036] "Pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device, and the embodiments of the present application do not limit the specific implementation method. Among them, "saving" can mean saving in one or more memories. The one or more memories can be set separately or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories can also be partially set separately and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, which is not limited by the embodiments of the present application.

[0037] The "protocol" involved in the embodiments of the present application may refer to a protocol family in the communication field, a standard protocol with a similar protocol family frame structure, or a related protocol used in future communication systems, and the embodiments of the present application do not make specific limitations on this.

[0038] In the embodiments of the present application, descriptions such as "when...", "in the case of...", "if" and "if" all mean that the device will make corresponding processing under certain objective circumstances. It does not limit the time, nor does it require the device to have a judgment action when implementing it, nor does it mean that there are other limitations.

[0039] In the description of the embodiments of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the embodiments of the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in the description of the embodiments of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or its similar expression refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" are used to distinguish the same or similar items with basically the same functions and effects. Those skilled in the art will appreciate that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0040] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0041] Figure 1 A schematic diagram of an operation control system of a large-capacity water turbine unit provided in an embodiment of the present application, such as Figure 1 As shown, the system may include a large-capacity water turbine set and a control device for the large-capacity water turbine set.

[0042] The control device may specifically be a terminal. The terminal may be a terminal with a transceiver function, or a chip or chip system that may be provided in the terminal. The terminal may also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a user station, a mobile station (MS), a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The terminal in the embodiment of the present application may be a mobile phone, a cellular phone, a smart phone, a tablet computer, a wireless data card, a personal digital assistant (PDA), a wireless modem, a handheld device (handset), a laptop computer, a machine type communication (MTC) terminal, a computer with a wireless transceiver function, a wireless terminal in an industrial control, etc.

[0043] A large-capacity water turbine unit may include N sets of turbine blades, where N is an integer greater than 1, and the N sets of turbine blades may be arranged in sequence along the same center line, and the center line is parallel to the water flow direction. Taking the i-th set of turbine blades and the i+1-th set of turbine blades in the N sets of turbine blades as an example, i is an integer ranging from 1 to N-1, such as Figure 2 As shown, the i-th group of turbine blades 21 is located in the i-th cavity 11, the i+1-th group of turbine blades 22 is located in the i+1-th cavity 12, the i-th cavity 11 is located above the i+1-th cavity 12, and a blade group is arranged between the i-th cavity 11 and the i+1-th cavity 12. The connecting portion 30 between the i-th cavity 11 and the i+1-th cavity 12 is an annular structure, and the i-th blade group 31 is arranged on the inner wall of the annular structure. Optionally, the cross-sectional shape of each blade in the i-th blade group 31 is a triangle, so that the angle between the surface of each blade facing the i-th group of turbine blades 21 and the flow direction of the water flow is less than 90°, so as to accelerate the flow rate of the water flow. Figure 3As shown, the structural principle of the blade group can be similar to the aperture in an optical lens, and the blade structure in the blade group is similar to the light shield in the aperture. A rotatable annular buckle 32 is arranged above the blade group, and the rotatable annular buckle 32 is arranged on the inner wall of the annular structure and can rotate around the center line of the annular structure. The rotatable annular buckle 32 is provided with an arc-shaped limiting groove 33 corresponding to the number of blades in the blade group, and the limiting member 34 on each blade in the i-th blade group 31 is located in a corresponding limiting groove 33. In this way, when the rotatable annular buckle 32 rotates clockwise or counterclockwise with the center line of the annular structure as the center, the limit groove 33 can drive the limit member 34, so that each blade in the i-th blade group 31 moves in a direction away from the center line of the annular structure or moves in a direction close to the center line of the annular structure. In this way, the size of the circular hole 35 at the limit position of each blade end in the blade group can be changed. The size of the circular hole 35 is the opening of the blade group. The larger the circular hole 35, the larger the opening of the blade group, and vice versa. On this basis, the blade group can change the degree of connectivity between the i-th cavity 11 and the i+1th cavity 11 accordingly through the change of the opening. The way of expressing the opening of the blade group can also be similar to the way of expressing the aperture size, such as from large to small, F1, F1.4, F2, F2.8, F4, F5.6, F8, F11, F16, F22, F32, F44, F64, etc.

[0044] Figure 4 The following is a flow chart of the method provided in the embodiment of the present application. Figure 4 As shown, the method is applied to the control equipment of a large-capacity water turbine unit, and the specific process of the operation control method of the large-capacity water turbine unit is as follows:

[0045] S401, the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the (i+1)-th group of turbine blades among the N groups of turbine blades.

[0046] The control device can determine, based on the current power demand, that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades 21 and the i+1-th group of turbine blades 22 in the N groups of turbine blades. The current power demand is positively correlated with the value of i. The embodiment of the present application does not limit the way in which the control device obtains the current power demand, such as the current power demand can be related to the current time period, or can also be dynamically configured.

[0047] For example, from time to time, the demand for electricity usually increases gradually and then decreases gradually (because the user's demand for electricity is gradual, the demand for electricity usually does not surge). Therefore, the control device can preset the relationship between these electricity demands and the value of i.

[0048] For ease of understanding, an example is used below to introduce that the power demand values ​​increase in sequence, namely Q1, Q2, Q3, and Q4. N groups of turbine blades are more than 2 groups. The values ​​of Q1 and i do not correspond, that is, the power demand can be met by controlling the output of the first group of turbine blades. When the power demand increases from Q1 to Q2, the values ​​of i corresponding to Q2 are 1 and 2, that is, when the power demand is Q2, the power output can be increased to meet the demand by coupling the first group of turbine blades with the second group of turbine blades (such as increasing the coupling, that is, increasing the opening). When the power demand increases from Q2 to Q3, the values ​​of i corresponding to Q3 are still 1 and 2, that is, when the power demand is Q3, the power output can be increased to meet the demand by further increasing the coupling of the first group of turbine blades with the second group of turbine blades on the original basis (such as full coupling, that is, the opening is maximized, and the details can be referred to the relevant introduction below). When the power demand increases from Q3 to Q4, the value of i corresponding to Q4 is 2 and 3, that is, when the power demand is Q4, the second group of turbine blades and the third group of turbine blades need to be coupled (such as increasing the coupling, that is, increasing the opening) to increase the power output to meet the demand. At this time, since the power demand is gradually increasing, the first group of turbine blades and the second group of turbine blades are also coupled and controlled at the same time (in a fully coupled state). In other words, when the power demand increases to Q4, the first group of turbine blades and the second group of turbine blades, as well as the second group of turbine blades and the third group of turbine blades are coupled and controlled at the same time. Conversely, if the power demand value decreases successively, the control process is similar, except that it is necessary to first reduce the coupling degree between the second group of turbine blades and the third group of turbine blades, and then reduce the coupling degree between the first group of turbine blades and the second group of turbine blades (that is, reduce the opening).

[0049] In other words, the control of multiple groups of turbine blades in the embodiments of the present application is similar, and can achieve coupling of two or more groups of turbine blades. For ease of understanding, the embodiments of the present application are introduced using the i-th blade group and the i+1-th blade group as examples.

[0050] S402, the control device adjusts the coupling degree between the i-th group of turbine blades and the (i+1)-th group of turbine blades by controlling the opening change of the i-th blade group.

[0051] The degree of coupling between the i-th group of turbine blades 21 and the i+1-th group of turbine blades 22 is positively correlated with the rotational speed of the i+1-th group of turbine blades 22. That is, the larger the opening of the i-th blade group 31, the stronger the impact of the water flow on the i+1-th group of turbine blades 22 after passing through the i-th group of turbine blades 21. In this way, the rotational speed of the i+1-th group of turbine blades 22 is accelerated, driving the water flow rate to increase, and then driving the rotational speed of the i-th group of turbine blades 21 to accelerate, and the power generation efficiency is improved. This is the so-called coupling between the i-th group of turbine blades 21 and the i+1-th group of turbine blades 22. The faster the rotational speeds of the two, the higher the degree of coupling. The details are described below.

[0052] Case 1:

[0053] The control device can control the opening of the i-th blade group 31 to increase from the first opening to the second opening according to the current power demand from the first preset value to the second preset value (specifically, it can be to control the rotatable annular buckle 32 to rotate to the corresponding position), wherein the first preset value corresponds to the first opening of the i-th blade group 31, and the second preset value corresponds to the second opening of the i-th blade group 31. In this way, the connection part 30 between the i-th cavity 11 and the i+1-th cavity 12 is an annular structure, the i-th blade group 31 is arranged on the inner wall of the annular structure, and each blade in the i-th blade group 31 moves in a direction away from the center line of the annular structure, so that the opening of the i-th blade group 31 increases from the first opening to the second opening, such as from F8 to F5.6. In this way, the size of the circular hole 35 at the end limit of each blade in the blade group becomes larger, and more water flows pass through the i-th group of turbine blades 21 and impact the i+1-th group of turbine blades 22, and the impact on the i+1-th group of turbine blades 22 is stronger.

[0054] Alternatively, if Figure 2 As shown, the i-th cavity 11 is provided with a leakage hole 13 (the number is not limited) on the side wall between the i-th group of turbine blades 21 and the i-th blade group 31. If the i-th blade group 31 is closed, the water flow in the i-th cavity 11 drives the i-th group of turbine blades 21 to rotate and then flows out from the leakage hole 13. Therefore, when the control device controls the opening of the i-th blade group 31 to increase from the first opening to the second opening, the control device can also reduce the aperture of the leakage hole 13 from the first aperture to the second aperture according to the opening of the i-th blade group 31 increasing from the first opening to the second opening. Among them, the first opening of the i-th blade group 31 corresponds to the first aperture of the leakage hole 13, and the second opening of the i-th blade group 31 corresponds to the second aperture of the leakage hole 13. The aperture of the leakage hole 13 decreases from the first aperture to the second aperture, and less water is discharged from the leakage hole 13, so that more water flows through the i-th group of turbine blades 21 and flows into the i+1-th cavity 12, thereby increasing the flow rate of water flowing from the i-th cavity 11 into the i+1-th cavity 12.

[0055] It can be understood that the embodiment of the present application does not limit the specific values ​​of the first aperture and the second aperture of the leakage hole 13, which can be set according to actual experimental conditions, as long as the change in its size can increase the flow rate of water flowing from the i-th cavity 11 to the i+1-th cavity 12.

[0056] Case 2:

[0057] The control device can control the opening of the i-th blade group 31 to decrease from the second opening to the first opening according to the current power demand amount decreasing from the second preset value to the first preset value (specifically, it can be controlling the rotatable annular clip 32 to rotate to the corresponding position). The first preset value corresponds to the first opening of the i-th blade group 31, and the second preset value corresponds to the second opening of the i-th blade group 31. The connecting portion 30 between the i-th cavity 11 and the (i+1)-th cavity 12 is an annular structure, and the i-th blade group 31 is arranged on the inner wall of the annular structure. Each blade in the i-th blade group 31 moves in a direction close to the center line of the annular structure, so that the opening of the i-th blade group 31 decreases from the second opening to the first opening. In this way, the size of the circular hole 35 at the limit position of the end of each blade in the blade group becomes smaller, and less water flows through the i-th group of turbine blades 21 to impact the i+1-th group of turbine blades 22, so the impact on the i+1-th group of turbine blades 22 is weakened, and the rotation speed of the i+1-th group of turbine blades 22 is reduced, which drives the water flow velocity to decrease, and then drives the rotation speed of the i-th group of turbine blades 21 to decrease, and the degree of coupling between the two is reduced.

[0058] Optionally, a leakage hole 13 is provided on the side wall of the i-th cavity 11 between the i-th group of turbine blades 21 and the i-th blade group 31. If the i-th blade group 31 is closed, the water flow impacts the i-th cavity 11 to drive the i-th group of turbine blades 21 to rotate and then flows out from the leakage hole 13. When the control device controls the opening of the i-th blade group 31 to increase from the first opening to the second opening, the control device increases the aperture of the leakage hole 13 from the second aperture to the first aperture according to the opening of the i-th blade group 31 decreasing from the second opening to the first opening, wherein the first opening of the i-th blade group 31 corresponds to the first aperture of the leakage hole 13, and the second opening of the i-th blade group 31 corresponds to the second aperture of the leakage hole 13. Increasing the aperture of the leakage hole 13 from the second aperture to the first aperture can reduce the flow rate of water flowing from the i-th cavity 11 to the (i+1)-th cavity 12.

[0059] In summary, the control device can determine that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among the N groups of turbine blades, thereby adjusting the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group. The degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotational speed of the i+1-th group of turbine blades, so that the rotational speed of the i+1-th group of turbine blades can be dynamically controlled through the coupling of the i-th group of turbine blades and the i+1-th group of turbine blades, thereby achieving more precise and dynamic adjustment of the power generation power.

[0060] Combination of the above Figure 4 The operation control method of the large-capacity water turbine set provided by the embodiment of the present application is described in detail. The operation control system for executing the large-capacity water turbine set provided by the embodiment of the present application is described in detail below.

[0061] The system includes a large-capacity water turbine unit including N groups of turbine blades, N is an integer greater than 1, the N groups of turbine blades are arranged in sequence along the same center line, and the center line is parallel to the water flow direction. The system also includes a control device for the large-capacity water turbine unit, and the system is configured as follows: the control device determines that the turbine blades that need to be coupled and controlled currently are the i-th group of turbine blades and the i+1-th group of turbine blades in the N groups of turbine blades, i is an integer ranging from 1 to N-1, the i-th group of turbine blades are located in the i-th cavity, the i+1-th group of turbine blades are located in the i+1-th cavity, the i-th cavity is located above the i+1-th cavity, a blade group is arranged between the i-th cavity and the i+1-th cavity, and the blade group can change the degree of connectivity between the i-th cavity and the i+1-th cavity accordingly by changing the opening degree; the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening degree change of the blade group, and the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotation speed of the i+1-th group of turbine blades.

[0062] Optionally, the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among N groups of turbine blades, including: the control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among N groups of turbine blades based on the current electric energy demand, wherein the current electric energy demand is positively correlated with the value of i.

[0063] Optionally, the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the change in the opening of the i-th blade group, including: the control device controls the opening of the i-th blade group to increase from a first opening to a second opening according to the current electric energy demand increasing from a first preset value to a second preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

[0064] Optionally, a leakage hole 13 is provided on the side wall of the i-th cavity between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, the water flow impacts the i-th cavity to drive the i-th group of turbine blades to rotate and then flows out from the leakage hole 13. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method also includes: the control device reduces the aperture of the leakage hole 13 from a first aperture to a second aperture according to the opening of the i-th blade group increasing from the first opening to the second opening, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole 13, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole 13. Reducing the aperture of the leakage hole 13 from the first aperture to the second aperture can increase the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

[0065] Optionally, the connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction away from the center line of the annular structure, so that the opening of the i-th blade group increases from a first opening to a second opening.

[0066] Optionally, the control device adjusts the degree of coupling between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the change in the opening of the i-th blade group, including: the control device controls the opening of the i-th blade group to decrease from the second opening to the first opening according to the current electric energy demand being reduced from the second preset value to the first preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

[0067] Optionally, a leakage hole 13 is provided on the side wall of the i-th cavity between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, the water flow impacts the i-th cavity to drive the i-th group of turbine blades to rotate and then flows out from the leakage hole 13. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method also includes: the control device increases the aperture of the leakage hole 13 from the second aperture to the first aperture according to the opening of the i-th blade group decreasing from the second opening to the first opening, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole 13, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole 13. Increasing the aperture of the leakage hole 13 from the second aperture to the first aperture can reduce the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

[0068] Optionally, the connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction close to the center line of the annular structure, so that the opening of the i-th blade group decreases from the second opening to the first opening.

[0069] Optionally, the cross-sectional shape of each blade in the i-th blade group is triangular, so that the angle between the surface of each blade facing the i-th group of turbine blades and the flow direction of the water flow is less than 90°.

[0070] Figure 5 This is a schematic diagram of the structure of a control device provided in an embodiment of the present application. For example, the control device may be a terminal, or a chip (system) or other component or assembly that may be provided in a terminal. Figure 5 As shown, the control device 400 may include a processor 401. Optionally, the control device 400 may also include a memory 402 and / or a transceiver 403. The processor 401 is coupled with the memory 402 and the transceiver 403, such as being connected via a communication bus.

[0071] Combine the following Figure 5 The components of the control device 400 are described in detail:

[0072] The processor 401 is the control center of the control device 400, which can be a processor or a general term for multiple processing elements. For example, the processor 401 is one or more central processing units (CPUs), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (FPGAs).

[0073] Optionally, the processor 401 may execute various functions of the control device 400 by running or executing a software program stored in the memory 402 and calling data stored in the memory 402, such as executing the above Figure 4 The operation control method of the large-capacity turbine unit is shown.

[0074] In a specific implementation, as an embodiment, the processor 401 may include one or more CPUs, such as Figure 5 CPU0 and CPU1 are shown in FIG.

[0075] In a specific implementation, as an embodiment, the control device 400 may also include multiple processors. Each of these processors may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor here may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0076] The memory 402 is used to store the software program for executing the solution of the present application, and the execution is controlled by the processor 401. The specific implementation method can refer to the above method embodiment, which will not be repeated here.

[0077] Optionally, the memory 402 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, an optical disc storage (including a compressed optical disc, a laser disc, an optical disc, a digital versatile disc, a Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 402 may be integrated with the processor 401, or may exist independently and be controlled through the interface circuit ( Figure 5 (not shown) is coupled to the processor 401, which is not specifically limited in the embodiment of the present application.

[0078] The transceiver 403 is used for communication with other control devices. For example, if the control device 400 is a terminal, the transceiver 403 can be used to communicate with a network device, or with another terminal device. For another example, if the control device 400 is a network device, the transceiver 403 can be used to communicate with a terminal, or with another network device.

[0079] Optionally, the transceiver 403 may include a receiver and a transmitter ( Figure 5 The receiver is used to implement a receiving function, and the transmitter is used to implement a sending function.

[0080] Optionally, the transceiver 403 may be integrated with the processor 401, or may exist independently and control the interface circuit ( Figure 5 (not shown) is coupled to the processor 401, which is not specifically limited in the embodiment of the present application.

[0081] Understandably, Figure 5 The structure of the control device 400 shown in the figure does not constitute a limitation on the control device. The actual control device may include more or fewer components than those shown in the figure, or combine certain components, or arrange the components differently.

[0082] In addition, the technical effects of the control device 400 can refer to the technical effects of the method described in the above method embodiment, which will not be repeated here.

[0083] It should be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0084] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0085] The above embodiments can be implemented in whole or in part by software, hardware (such as circuits), firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0086] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0087] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0088] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0089] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0090] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0091] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0092] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0093] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0094] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0095] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling the operation of a large-capacity hydraulic turbine unit, characterized in that: A large-capacity water turbine unit includes N groups of turbine blades, where N is an integer greater than 1, and the N groups of turbine blades are arranged in sequence along the same center line, and the center line is parallel to the water flow direction. The method is applied to a control device of the large-capacity water turbine unit, and the method includes: The control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades in the N groups of turbine blades, i being an integer ranging from 1 to N-1, the i-th group of turbine blades being located in the i-th cavity, the i+1-th group of turbine blades being located in the i+1-th cavity, the i-th cavity being located above the i+1-th cavity, an i-th blade group being arranged between the i-th cavity and the i+1-th cavity, and the i-th blade group being able to change the degree of connectivity between the i-th cavity and the i+1-th cavity accordingly by changing the opening degree; The control device adjusts the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, and the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotation speed of the i+1-th group of turbine blades; The control device adjusts the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, including: The control device controls the opening of the i-th blade group from a first opening to a second opening according to the current electric energy demand increasing from a first preset value to a second preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

2. The method according to claim 1, characterized in that The control device determines that the turbine blades currently required to be coupled and controlled are the i-th group of turbine blades and the (i+1)-th group of turbine blades in the N groups of turbine blades, including: The control device determines, based on the current electric energy demand, that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades among the N groups of turbine blades, wherein the current electric energy demand is positively correlated with the value of i.

3. The method according to claim 1, characterized in that The i-th cavity is provided with a leakage hole on a side wall between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, water flows out of the leakage hole after impacting the i-th cavity and driving the i-th group of turbine blades to rotate. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method further includes: The control device reduces the aperture of the leakage hole from the first aperture to the second aperture according to the opening of the i-th blade group increasing from the first aperture to the second aperture, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole, and the reduction of the aperture of the leakage hole from the first aperture to the second aperture can increase the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

4. The method according to claim 1 or 3, characterized in that: The connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction away from the center line of the annular structure, so that the opening of the i-th blade group increases from a first opening to a second opening.

5. The method according to claim 2, characterized in that: The control device adjusts the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, including: The control device controls the opening of the i-th blade group from the second opening to the first opening according to the current electric energy demand being reduced from the second preset value to the first preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

6. The method according to claim 5, characterized in that The i-th cavity is provided with a leakage hole on a side wall between the i-th group of turbine blades and the i-th blade group. If the i-th blade group is closed, water flows out of the leakage hole after impacting the i-th cavity and driving the i-th group of turbine blades to rotate. When the control device controls the opening of the i-th blade group to increase from a first opening to a second opening, the method further includes: The control device increases the aperture of the leakage hole from the second aperture to the first aperture according to the opening of the i-th blade group decreasing from the second aperture to the first aperture, wherein the first opening of the i-th blade group corresponds to the first aperture of the leakage hole, and the second opening of the i-th blade group corresponds to the second aperture of the leakage hole, and the aperture of the leakage hole increasing from the second aperture to the first aperture can reduce the flow rate of water flowing from the i-th cavity into the i+1-th cavity.

7. The method according to claim 5 or 6, characterized in that: The connecting part between the i-th cavity and the i+1-th cavity is an annular structure, the i-th blade group is arranged on the inner wall of the annular structure, and each blade in the i-th blade group moves in a direction close to the center line of the annular structure, so that the opening of the i-th blade group decreases from the second opening to the first opening.

8. The method according to claim 1, characterized in that The cross-sectional shape of each blade in the i-th blade group is triangular, so that the angle between the surface of each blade facing the i-th group of turbine blades and the flow direction of the water flow is less than 90°.

9. An operation control system for a large-capacity water turbine unit, characterized in that: The system includes a large-capacity water turbine unit including N groups of turbine blades, N is an integer greater than 1, and the N groups of turbine blades are arranged in sequence along the same center line, and the center line is parallel to the water flow direction. The system also includes a control device for the large-capacity water turbine unit, and the system is configured as follows: The control device determines that the turbine blades that currently need to be coupled and controlled are the i-th group of turbine blades and the i+1-th group of turbine blades in the N groups of turbine blades, i being an integer ranging from 1 to N-1, the i-th group of turbine blades being located in the i-th cavity, the i+1-th group of turbine blades being located in the i+1-th cavity, the i-th cavity being located above the i+1-th cavity, an i-th blade group being arranged between the i-th cavity and the i+1-th cavity, and the i-th blade group being able to change the degree of connectivity between the i-th cavity and the i+1-th cavity accordingly by changing the opening degree; The control device adjusts the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, and the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades is positively correlated with the rotation speed of the i+1-th group of turbine blades; The control device adjusts the coupling degree between the i-th group of turbine blades and the i+1-th group of turbine blades by controlling the opening change of the i-th blade group, including: The control device controls the opening of the i-th blade group from a first opening to a second opening according to the current electric energy demand increasing from a first preset value to a second preset value, wherein the first preset value corresponds to the first opening of the i-th blade group, and the second preset value corresponds to the second opening of the i-th blade group.

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