A Francis turbine generator unit opening guide vane drainage control method and system

Abstract

The application discloses a Francis turbine generator unit guide vane drainage control method and system, comprising: based on the existing governor electric control system control model, executing a one-key guide vane drainage process; through the relationship between the governor water head and the guide vane opening degree, the governor water head is adaptively adjusted, the guide vane opening degree is controlled to be minimum, and the real-time adaptive correction of the governor water head in the one-key guide vane drainage mode is realized. The application provides more reliable guarantee for reliable implementation of the one-key guide vane drainage process of the Francis turbine generator unit.

Description

Technical Field

[0001] This invention relates to the field of mixed-flow hydro-generator technology, and in particular to a method and system for controlling the drainage of guide vanes in a mixed-flow hydro-generator set. Background Technology

[0002] The existing one-click guide vane opening drainage process design and method for mixed-flow turbine generator unit monitoring systems involves designing a dedicated sequential control process within the hydropower station's computer monitoring system program. This process, initiated with a single click, automatically, quickly, and safely drains water accumulated in the diversion tunnel. One of the main problems this method needs to address is the control of the turbine guide vane opening. Because mixed-flow turbine generator units have long diversion tunnels, after the unit's inlet gate closes and the guide vanes open for drainage, if the guide vane opening changes too rapidly, the diversion tunnel will undergo a transition from full flow to open flow. During this process, the diversion tunnel will draw in air through the vents to compensate for the pressure loss, and the vent velocity will reach its peak. If the air replenishment speed through the vents is insufficient, the rapidly flowing water will create negative pressure within the diversion tunnel. Due to the significant pressure changes, the diversion tunnel may experience collapse or rockfalls. Currently, there are two solutions.

[0003] The first method involves statistical analysis of the changing trends of characteristic data such as guide vane opening, unit speed, and volute inlet pressure during manual guide vane drainage. This analysis, combined with changes in unit vibration, bearing temperature, cooling water flow rate, and maintenance personnel's inspection of the water intake tunnel during overhaul, results in a comprehensive analysis of these factors. This model simulates the manual guide vane drainage process and represents a control system model for the governor's electrical control system. While this method meets functional and safety requirements, it suffers from poor compatibility with the existing operating states of the governor's electrical control system and the execution of control logic, making its implementation difficult.

[0004] The second method, without modifying the governor's electronic control system's start-up, shutdown, and control parameters, adds three new operating states to the existing five: guide vane drainage start-up state, guide vane drainage state, and guide vane drainage shutdown state. This enables the monitoring system to perform a one-click guide vane drainage function. This method requires research into the concrete strength of the water diversion tunnel and the air supply speed of the vents to ensure that, without modifying the governor's electronic control system control model, the harmful vacuum generated during the one-click guide vane drainage process will not damage the concrete of the turbine generator's water diversion tunnel. A problem with this method is that the air supply speed of the vents at some power plants is insufficient to counteract the negative pressure created by the rapid outflow of water from the generator's water diversion tunnel and volute under the one-click guide vane drainage mode. Therefore, this method is not entirely applicable to such power plants. Summary of the Invention

[0005] 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.

[0006] In view of the aforementioned existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a method and system for controlling the drainage of guide vanes in a mixed-flow hydro-turbine generator set, which solves the problem that excessive guide vane opening during the existing one-button guide vane drainage process causes water to flow out rapidly and form a large harmful vacuum in the water diversion tunnel.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] In a first aspect, the present invention provides a method for controlling the drainage of a mixed-flow hydro-turbine generator set with open guide vanes, comprising:

[0010] Based on the existing governor electronic control system control model, execute the one-click guide vane opening drainage process;

[0011] By using the relationship between the governor head and the guide vane opening curve, the governor head is adaptively adjusted to control the guide vane opening to the minimum, thus achieving real-time adaptive correction of the governor head in the one-button guide vane opening drainage mode.

[0012] As a preferred embodiment of the guide vane drainage control method for the mixed-flow turbine generator set described in this invention, wherein:

[0013] The speed controller electronic control system includes eight working states, namely, shutdown standby state, startup process state, no-load state, load state, shutdown process state, guide vane drainage startup process state, guide vane drainage state, and guide vane drainage shutdown process state.

[0014] After processing the collected electrical control system status signals, the governor controller controls the rotation process of the hydro-generator controller's electrical control system and transmits the electrical control system status information to the monitoring system.

[0015] As a preferred embodiment of the guide vane drainage control method for the mixed-flow turbine generator set described in this invention, wherein:

[0016] The control parameters of the speed governor electronic control system include:

[0017] Frequency inflection point f during power-on process 开机 The inflection point of guide vane opening during startup process p 开机 p 开机Equal to 1.4 times the no-load opening; governor no-load frequency f 空载 Unloaded guide vane opening p 空载 ; Standby frequency f 停机 Shutdown standby guide vane opening p 停机 Power-on step size p 开机步长 Stop step size p 停机步长。

[0018] As a preferred embodiment of the guide vane drainage control method for the mixed-flow turbine generator set described in this invention, wherein:

[0019] The opening process state of the guide vane drainage start-up includes:

[0020] After receiving the "guide vane opening and drainage order" from the monitoring system, the speed governor's electronic control system switches from the standby state to the guide vane opening and drainage start-up state, entering a two-stage start-up process. The opening degree in the first stage is limited to 1.4 times the no-load opening degree. The opening degree setting increases uniformly according to the given start-up step size until the guide vane opening degree reaches the first stage opening limit value, which is 1.4 times the no-load opening degree, and remains unchanged, so that the unit speed rises rapidly and quickly passes through the vibration zone.

[0021] When the unit frequency reaches the frequency inflection point f during the start-up process 开机 At that time, the opening degree was given as the no-load opening degree, and the guide vane opening degree rapidly decreased from 1.4 times the no-load opening degree to the no-load opening degree, and the unit frequency growth rate slowed down.

[0022] As a preferred embodiment of the guide vane drainage control method for the mixed-flow turbine generator set described in this invention, wherein:

[0023] The open guide vane drainage state includes:

[0024] When the unit frequency reaches the no-load frequency f 空载 When the turbine enters the open guide vane drainage state, the PID controller is engaged for calculation. The turbine quickly adjusts to the rated speed. When the turbine's power is insufficient to maintain 100% rated speed, the controller compares the deviation between the frequency and the given value and outputs a guide vane opening control signal after PID calculation. The guide vane opening is automatically adjusted. After the guide vane opening increases to the maximum limit and the turbine speed begins to decrease, the PID calculation is exited, and the current opening is maintained.

[0025] The guide vane drainage shutdown process includes:

[0026] After receiving the "governor stop command" from the monitoring system, the governor controller adjusts the guide vane opening p according to the set value. 给定 =0 and stop step size p 停机步长 The process of adjusting the guide vane opening to full closure.

[0027] As a preferred embodiment of the guide vane drainage control method for the mixed-flow turbine generator set described in this invention, wherein:

[0028] The speed controller's electronic control system is designed with head protection logic, the specific protection logic of which is as follows:

[0029] When the speed governor operates with automatic head control, it monitors the head changes within the minimum and maximum head ranges.

[0030] When the speed governor operates with automatic head control, the current cycle monitoring head and the speed governor's operating head are compared. If the deviation between the two is less than 5 meters, the monitoring head is assigned to the speed governor's operating head. If the deviation between the two is greater than 25 meters for 5 consecutive scanning cycles, the speed governor's operating head is kept constant, and a sudden head change alarm is triggered; that is, gradient judgment is added.

[0031] As a preferred embodiment of the guide vane drainage control method for mixed-flow hydro-generator units described in this invention, the step of adaptively adjusting the governor head based on the relationship between the governor head and the guide vane opening to control the guide vane opening to a minimum includes the following steps:

[0032] System initialization: Read the governor head and no-load opening correlation curve to obtain the head value corresponding to the minimum no-load opening;

[0033] Determine whether the one-click guide vane opening drainage process of the monitoring system has been started;

[0034] If started, determine whether the monitoring system's one-click guide vane opening drainage process has been executed up to the "guide vane opening drainage" process;

[0035] If not started, the process will exit;

[0036] Determine whether the one-click guide vane opening drainage process of the monitoring system has been executed up to the "guide vane opening drainage" process;

[0037] If the process reaches "open guide vane drainage", then determine the governor's operating head H. OP Is it greater than or equal to the governor's maximum head value H? max Subtract the head gradient H g The value;

[0038] If the process does not reach the "open guide vane drainage" stage, the process will exit.

[0039] Determine the governor's operating head H OP Is it greater than or equal to the governor's maximum head value H? max Subtract the head gradient H g The value;

[0040] If it is less than the maximum head value H of the speed controller max Subtract the head gradient H gThe value of H indicates that the governor's operating head is... OP Add the head gradient value H g Assign the operating head H to the speed governor OP Return to determine the governor's operating head H OP Is it greater than or equal to the governor's maximum head value H? max Subtract the head gradient H g The value;

[0041] If it is greater than or equal to the maximum head value H of the speed governor max Subtract the head gradient H g If the value is , then the speed governor will set the maximum head value H. max Assign the operating head H to the speed governor OP ;

[0042] Determine whether the one-click guide vane opening drainage process of the monitoring system has ended;

[0043] If the process ends, then compare the monitored head value H with the governor's operating head value H. OP Is the difference greater than the head gradient H? g The value;

[0044] If not completed, return to the speed governor and set the maximum head value H. max Assign the operating head H to the speed governor OP ;

[0045] Assign the monitored head value to the governor's operating head H. OP The process is now complete.

[0046] Secondly, the present invention provides a guide vane drainage control system for a mixed-flow hydro-generator set, comprising:

[0047] The execution module, based on the existing governor electronic control system control model, executes the one-click guide vane opening drainage process;

[0048] The adjustment module adaptively adjusts the governor head based on the relationship between the governor head and the guide vane opening curve, controlling the guide vane opening to the minimum, thus achieving real-time adaptive correction of the governor head in the one-button guide vane opening drainage mode.

[0049] Thirdly, the present invention provides a computing device, comprising:

[0050] Memory, used to store programs;

[0051] A processor is configured to execute the computer-executable instructions, which, when executed by the processor, implement the steps of the guide vane drainage control method for the mixed-flow turbine generator set.

[0052] Fourthly, the present invention provides a computer-readable storage medium, comprising: when the program is executed by a processor, the steps of implementing the aforementioned method for controlling the drainage of a mixed-flow turbine generator set with open guide vanes.

[0053] The beneficial effects of this invention are as follows: Without modifying the existing governor electronic control system control model, this invention aims to achieve real-time adaptive correction of the governor head in the one-click guide vane opening drainage mode of the monitoring system, based on the relationship between the governor head and the guide vane opening coordination curve. This solves the problem of excessive guide vane opening during the one-click guide vane opening drainage process, which causes water to flow out rapidly and form a large harmful vacuum in the water diversion tunnel. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. 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:

[0055] Figure 1 This is a basic flowchart illustrating a method for controlling the drainage of a mixed-flow hydro-turbine generator set with open guide vanes, provided in one embodiment of the present invention.

[0056] Figure 2 This is a control flowchart of a method for controlling the drainage of a mixed-flow hydro-generator set with open guide vanes, provided as an embodiment of the present invention. Detailed Implementation

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] Example 1

[0064] Referring to the figure, an embodiment of the present invention provides a method for controlling drainage of a mixed-flow turbine generator set with open guide vanes, comprising:

[0065] S1: Based on the existing governor electronic control system control model, execute the one-click guide vane opening drainage process;

[0066] S2: By using the relationship between the governor head and the guide vane opening curve, the governor head is adaptively adjusted to control the guide vane opening to the minimum, thus realizing real-time adaptive correction of the governor head in the one-button guide vane opening drainage mode.

[0067] Furthermore, the speed controller's electronic control system includes eight operating states: standby shutdown state, start-up process state, no-load state, load state, shutdown process state, guide vane drainage start-up process state, guide vane drainage state, and guide vane drainage shutdown process state.

[0068] Furthermore, the governor controller processes the collected electrical control system status signals and controls the rotation process of the hydro-generator controller's electrical control system, while simultaneously transmitting the electrical control system status information to the monitoring system.

[0069] Furthermore, the control parameters of the speed governor electronic control system include:

[0070] Frequency inflection point f during power-on process 开机 The inflection point of guide vane opening during startup process p 开机 p 开机 Equal to 1.4 times the no-load opening; governor no-load frequency f 空载 Unloaded guide vane opening p 空载 ; Standby frequency f 停机 Shutdown standby guide vane opening p 停机 Power-on step size p 开机步长 Stop step size p 停机步长。

[0071] Furthermore, the start-up process of opening the guide vane for drainage includes:

[0072] After receiving the "guide vane opening and drainage order" from the monitoring system, the speed governor's electronic control system switches from the standby state to the guide vane opening and drainage start-up state, entering a two-stage start-up process. The opening degree in the first stage is limited to 1.4 times the no-load opening degree. The opening degree setting increases uniformly according to the given start-up step size until the guide vane opening degree reaches the first stage opening limit value, which is 1.4 times the no-load opening degree, and remains unchanged, so that the unit speed rises rapidly and quickly passes through the vibration zone.

[0073] When the unit frequency reaches the frequency inflection point f during the start-up process 开机 At that time, the opening degree was given as the no-load opening degree, and the guide vane opening degree rapidly decreased from 1.4 times the no-load opening degree to the no-load opening degree, and the unit frequency growth rate slowed down.

[0074] Furthermore, the open guide vane drainage state includes:

[0075] When the unit frequency reaches the no-load frequency f 空载 When the turbine enters the open guide vane drainage state, the PID controller is engaged for calculation. The turbine quickly adjusts to the rated speed. When the turbine's power is insufficient to maintain 100% rated speed, the controller compares the deviation between the frequency and the given value and outputs a guide vane opening control signal after PID calculation. The guide vane opening is automatically adjusted. After the guide vane opening increases to the maximum limit and the turbine speed begins to decrease, the PID calculation is exited, and the current opening is maintained.

[0076] Furthermore, the guide vane drainage shutdown process includes:

[0077] After receiving the "governor stop command" from the monitoring system, the governor controller adjusts the guide vane opening p according to the set value. 给定 =0 and stop step size p 停机步长 The process of adjusting the guide vane opening to full closure.

[0078] Furthermore, the governor's electronic control system is designed with head protection logic, the specific protection logic of which is as follows:

[0079] When the speed governor operates with automatic head control, it monitors the head changes within the minimum and maximum head ranges.

[0080] When the speed governor operates with automatic head control, the current cycle monitoring head and the speed governor's operating head are compared. If the deviation between the two is less than 5 meters, the monitoring head is assigned to the speed governor's operating head. If the deviation between the two is greater than 25 meters for 5 consecutive scanning cycles, the speed governor's operating head is kept constant, and a sudden head change alarm is triggered; that is, gradient judgment is added.

[0081] Furthermore, the no-load opening is calculated by interpolation based on different operating head values. Different operating heads correspond to different no-load openings, therefore the guide vane setting is related to the operating head. During normal operation of the hydro-generator unit, changes in the operating head will cause changes in the guide vane setting, servo motor activation, and changes in unit frequency or load. Therefore, before the one-click guide vane opening drainage process in the monitoring system reaches the "guide vane opening drainage" stage, the governor head can be adaptively adjusted based on the relationship between the governor head and the guide vane opening coordination curve to control the guide vane opening to the minimum. This solves the problem of excessive guide vane opening during the one-click guide vane opening drainage process, which causes water to flow out rapidly and create a large harmful vacuum in the water diversion tunnel. After the one-click guide vane drainage process is completed, the governor's operating head is automatically corrected to the actual head. This avoids a large difference between the actual head and the governor's operating head during normal unit operation, which could lead to an excessive deviation between the actual no-load opening and the governor's calculated no-load opening. This would affect the unit's start-up performance and mode switching performance, resulting in excessively long start-up time or excessive frequency overshoot. It could also cause excessive opening disturbance when switching from manual to automatic mode, or even fail to start up.

[0082] The original data of the governor head and no-load opening coordination curve are shown in Table 1.

[0083] Table 1. Data on the correlation curves between governor head and no-load opening.

[0084] <![CDATA[H1]]> <![CDATA[H2]]> … <![CDATA[H i-1 ]]> <![CDATA[H i ]]> … <![CDATA[H n-1 ]]> <![CDATA[H n ]]> <![CDATA[Y1]]> <![CDATA[Y2]]> … <![CDATA[Y i-1 ]]> <![CDATA[Y i ]]> … <![CDATA[Y n-1 ]]> <![CDATA[Y n ]]>

[0085] In Table 1, n and i are both positive integers, 1 < i ≤ n, and Yi is the no-load opening degree corresponding to Hi head.

[0086] The control parameters of the power plant computer monitoring system include: the monitored head H.

[0087] The control parameters of the governor's electronic control system include: maximum head H max Minimum head H min Operating head H OP Head gradient H g .

[0088] Furthermore, by using the relationship between the governor head and the guide vane opening curve, the governor head is adaptively adjusted to control the guide vane opening to a minimum, including the following steps:

[0089] A1: System initialization, read the governor head and no-load opening coordination curve, obtain the head value corresponding to the minimum no-load opening, and proceed to A2;

[0090] A2: Determine whether the one-click guide vane drainage process of the monitoring system has been started. If yes, proceed to A3; otherwise, exit the process.

[0091] A3: Determine whether the one-click guide vane opening drainage process of the monitoring system has been executed to "open guide vane drainage". If yes, the process exits; if no, proceed to A4.

[0092] A4: Determine the governor's operating head (H) OP Is it greater than or equal to the governor's maximum head value (H)? max Subtract the head gradient value (H) g If yes, proceed to A6; otherwise, proceed to A5.

[0093] A5: Governor operating head (H) OP Adding the head gradient value (Hg) to the governor's operating head (H) OP ), return A4;

[0094] A6: Maximum head value of the speed controller (H) max Assign the operating head (H) to the speed governor OP ), enter A7;

[0095] Step 7: Determine whether the one-click opening of the guide vane drainage process of the monitoring system has ended. If yes, proceed to A8; otherwise, return to A6.

[0096] A8: Determine the difference between the monitored head value (H) and the governor's operating head value (H). OP Is the difference greater than the head gradient value (H)? g If yes, proceed to A9; otherwise, proceed to A10.

[0097] A9: Governor operating head (H) OP Subtract the head gradient (H) g The value is assigned to the governor's operating head (H) OP ), return A8;

[0098] A10: Monitor the head value and assign it to the governor's operating head (H) OP The process is now complete.

[0099] This embodiment also provides a guide vane drainage control system for a mixed-flow hydro-generator set, including:

[0100] The execution module, based on the existing governor electronic control system control model, executes the one-click guide vane opening drainage process;

[0101] The adjustment module adaptively adjusts the governor head based on the relationship between the governor head and the guide vane opening curve, controlling the guide vane opening to the minimum, thus achieving real-time adaptive correction of the governor head in the one-button guide vane opening drainage mode.

[0102] Furthermore, this also includes:

[0103] Memory, used to store programs;

[0104] A processor is used to load the program to execute the described mixed-flow turbine generator set guide vane drainage control method.

[0105] This embodiment also provides a computer-readable storage medium storing a program, which, when executed by a processor, implements the aforementioned method for controlling the drainage of the mixed-flow turbine generator set with open guide vanes.

[0106] The storage medium proposed in this embodiment belongs to the same inventive concept as the guide vane drainage control method for mixed-flow hydro-turbine generator sets proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0107] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0108] Example 2

[0109] Referring to Table 2, an embodiment of the present invention provides a method for controlling the drainage of a mixed-flow hydro turbine generator set with open guide vanes. To verify its beneficial effects, a scientific demonstration is conducted through specific implementation methods and their effects.

[0110] The specific details of this embodiment are as follows:

[0111] The following section details the patented technology using the method for controlling the guide vane opening during the drainage process of a hydroelectric generator unit monitoring system. Table 2 shows the correlation curve data between the governor head and no-load opening of the hydroelectric generator unit.

[0112] Table 2. Data on the correlation curves between the governor head and no-load opening degree of a certain hydro-generator unit.

[0113] Water head (meters) 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 No-load opening degree (%) 22.8 22.1 21.4 20.7 20 19.3 18.6 17.9 17.2 16.5 15.8 15.1 14.4 13.7 13

[0114] The head of the governor of the hydro-generator unit of the power station is collected, calculated and issued by the power station computer monitoring system. If the head signal processing is unstable, it will cause frequent changes in the no-load opening, which will lead to frequent changes in the guide vane setting and cause the unit to be unstable. Therefore, a head protection logic is designed in the governor electrical control system. The specific protection logic is as follows: (1) When the governor is running with automatic head, the monitoring head changes within the range of minimum head and maximum head; (2) When the governor is running with automatic head, the current period monitoring head and the governor running head are compared. If the deviation between the two is less than 5 meters, the monitoring head is assigned to the governor running head. If the deviation between the two is greater than 25 meters for 5 consecutive scanning cycles, the governor running head is kept unchanged and a head change alarm is reported; that is, gradient judgment is added.

[0115] Assuming the governor's operating head is 110 meters and the head gradient is 20 meters before the start of the guide vane opening drainage process, the steps for controlling the guide vane opening degree during the one-button guide vane opening drainage process of this hydro-generator unit are as follows:

[0116] Step 1: System initialization, read the governor head and no-load opening coordination curve, obtain the head value corresponding to the minimum no-load opening as 13%, and proceed to Step 2;

[0117] Step 2: Determine if the one-click guide vane drainage process of the monitoring system has been started. If yes, proceed to Step 3; otherwise, exit the process.

[0118] Step 3: Determine whether the one-click guide vane opening drainage process of the monitoring system has been executed to "open guide vane drainage". If yes, the process exits; otherwise, proceed to step 4.

[0119] Step 4: Determine whether the governor's operating head of 110 meters is greater than or equal to the governor's maximum head of 170 meters minus the head gradient of 20 meters. If yes, proceed to step 6; otherwise, proceed to step 5.

[0120] Step 5: The governor's operating head of 110 meters plus the head gradient value of 20 meters is assigned to the governor's operating head of 130 meters, and then the process returns to Step 4.

[0121] Step 6: Assign the maximum head value of 170 meters to the governor and set the operating head to 170 meters. Proceed to Step 7.

[0122] Step 7: Determine whether the one-click opening of the guide vane drainage process of the monitoring system has ended. If yes, proceed to step 8; otherwise, return to step 6.

[0123] Step 8: Determine whether the difference between the monitored head value of 110 meters and the governor's operating head value of 170 meters is greater than the head gradient value of 20 meters. If yes, proceed to step 9; otherwise, proceed to step 10.

[0124] Step 9: Subtract the head gradient of 20 meters from the governor's operating head of 170 meters and assign the value to the governor's operating head of 150 meters, then return to step 8;

[0125] Step 10: Assign the monitored head value to the speed controller at a head of 110 meters, and the process ends.

[0126] 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.

Claims

1. A method for controlling drainage of guide vanes in a mixed-flow hydro-generator unit, characterized in that, include: Based on the existing governor electronic control system control model, execute the one-click guide vane opening drainage process; By using the relationship between the governor head and the guide vane opening curve, the governor head is adaptively adjusted to control the guide vane opening to the minimum, thus realizing real-time adaptive correction of the governor head in the one-button guide vane opening drainage mode. The method of adaptively adjusting the governor head and controlling the guide vane opening to the minimum, based on the relationship between the governor head and the guide vane opening curve, includes the following steps: System initialization: Read the governor head and no-load opening correlation curve to obtain the head value corresponding to the minimum no-load opening; Determine whether the one-click guide vane opening drainage process of the monitoring system has been started; If activated, determine whether the monitoring system's one-click guide vane opening drainage process has reached the guide vane opening drainage stage. Process section; If not started, the process will exit; Determine whether the one-click guide vane opening drainage process of the monitoring system has been executed to the guide vane opening drainage process stage; If the process reaches the point of opening the guide vane drainage, then determine the governor's operating head H. OP Is it greater than or equal to the governor's maximum head value H? max Subtract the head gradient H g The value; If the process does not reach the open guide vane drainage stage, the process will exit. Determine the governor's operating head H OP Is it greater than or equal to the governor's maximum head value H? max Subtract the head gradient H g The value; If it is less than the maximum head value H of the speed controller max Subtract the head gradient H g The value of H indicates that the governor's operating head is... OP Add the head gradient value H g Assign the operating head H to the speed governor OP Return to determine the governor's operating head H OP Is it greater than or equal to the governor's maximum head value H? max Subtract the head gradient H g The value; If it is greater than or equal to the maximum head value H of the speed governor max Subtract the head gradient H g If the value is , then the speed governor will set the maximum head value H. max Assign the operating head H to the speed governor OP ; Determine whether the one-click guide vane opening drainage process of the monitoring system has ended; If the process ends, then compare the monitored head value H with the governor's operating head value H. OP Is the difference greater than the head gradient H? g The value; If not completed, return to the speed governor and set the maximum head value H. max Assign the operating head H to the speed governor OP ; Assign the monitored head value to the governor's operating head H. OP The process is now complete.

2. The method for controlling drainage of a mixed-flow hydro-turbine generator set with open guide vanes as described in claim 1, characterized in that: The speed controller electronic control system includes eight working states, namely, shutdown standby state, startup process state, no-load state, load state, shutdown process state, guide vane drainage startup process state, guide vane drainage state, and guide vane drainage shutdown process state. After processing the collected electrical control system status signals, the governor controller controls the rotation process of the hydro-generator controller's electrical control system and transmits the electrical control system status information to the monitoring system.

3. The method for controlling drainage of a mixed-flow hydro-turbine generator set with open guide vanes as described in claim 1 or 2, characterized in that: The control parameters of the speed governor electronic control system include: Frequency inflection point f during power-on process 开机 The inflection point of guide vane opening during startup process p 开机 p 开机 Equal to 1.4 times the no-load opening; governor no-load frequency f 空载 Unloaded guide vane opening p 空载 ; Standby frequency f 停机 Shutdown standby guide vane opening p 停机 Power-on step size p 开机步长 Stop step size p 停机步长 .

4. The method for controlling drainage of a mixed-flow hydro-turbine generator set with open guide vanes as described in claim 3, characterized in that: The opening process state of the guide vane drainage start-up includes: After receiving the guide vane opening and drainage command from the monitoring system, the speed governor's electronic control system switches from the standby state to the guide vane opening and drainage start-up state, entering a two-stage start-up process. The opening degree in the first stage is limited to 1.4 times the no-load opening degree. The opening degree setting increases uniformly according to the given start-up step size until the guide vane opening degree reaches the first stage opening limit value, which is 1.4 times the no-load opening degree, so that the unit speed rises rapidly and quickly passes through the vibration zone. When the unit frequency reaches the frequency inflection point f during the start-up process 开机 At that time, the opening degree was given as the no-load opening degree, and the guide vane opening degree rapidly decreased from 1.4 times the no-load opening degree to the no-load opening degree, and the unit frequency growth rate slowed down.

5. The method for controlling drainage of a mixed-flow hydro-turbine generator set with open guide vanes as described in claim 4, characterized in that: The open guide vane drainage state includes: When the unit frequency reaches the no-load frequency f 空载 When the turbine enters the open guide vane drainage state, the PID controller is engaged for calculation. The turbine quickly adjusts to the rated speed. When the turbine's power is insufficient to maintain 100% rated speed, the controller compares the deviation between the frequency and the given value and outputs a guide vane opening control signal after PID calculation. The guide vane opening is automatically adjusted. After the guide vane opening increases to the maximum limit and the turbine speed begins to decrease, the PID calculation is exited, and the current opening is maintained. The guide vane drainage shutdown process includes: After receiving the governor stop command from the monitoring system, the governor controller adjusts the guide vane opening according to the set value. p 给定 =0 and stop step size p 停机步长 The process of adjusting the guide vane opening to full closure.

6. The method for controlling drainage of a mixed-flow hydro-turbine generator set with open guide vanes as described in claim 5, characterized in that: The speed controller's electronic control system is designed with head protection logic, the specific protection logic of which is as follows: When the speed governor operates with automatic head control, it monitors the head changes within the minimum and maximum head ranges. When the speed governor operates with automatic head control, the current cycle monitoring head and the speed governor's operating head are compared. If the deviation between the two is less than 5 meters, the monitoring head is assigned to the speed governor's operating head. If the deviation between the two is greater than 25 meters for 5 consecutive scanning cycles, the speed governor's operating head is kept constant, and a sudden head change alarm is triggered; that is, gradient judgment is added.

7. A guide vane drainage control system for a mixed-flow hydro-generator unit, characterized in that, The method of claim 1 is used, comprising: The execution module, based on the existing governor electronic control system control model, executes the one-click guide vane opening drainage process; The adjustment module adaptively adjusts the governor head based on the relationship between the governor head and the guide vane opening curve, controlling the guide vane opening to the minimum, thus achieving real-time adaptive correction of the governor head in the one-button guide vane opening drainage mode.

8. An electronic device, characterized in that, include: Memory, used to store programs; A processor for loading the program to perform the steps of the guide vane drainage control method for a mixed-flow hydro-generator unit as described in any one of claims 1-6.

9. A computer-readable storage medium storing a program, characterized in that, When the program is executed by the processor, it implements the steps of the guide vane drainage control method for a mixed-flow hydro-generator unit as described in any one of claims 1-6.

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