Intelligent speed regulation system and speed regulation method of special valve for hydropower station

Abstract

The invention relates to the technical field of intelligent speed regulation control, in particular to an intelligent speed regulation system of a special valve for a hydropower station and a speed regulation method of the intelligent speed regulation system. The acquisition unit acquires linkage signals of the bypass valve, the main valve and the speed regulating valve according to a preset opening and closing strategy; the conversion unit converts the linkage signal into a water flow state value of the water turbine through a first conversion function; the speed regulation analysis unit judges whether the regulation state result of the water turbine is abnormal or not according to the water flow state value, generates a valve position instruction according to the valve flow characteristic of the main valve, enters the speed regulation control unit, generates an early warning signal and generates a preset opening and closing strategy regulation signal; the speed regulation control unit converts the valve position instruction into a control valve instruction through a second conversion function, and obtains a control valve adjustment coefficient of the control valve instruction; and the opening degree adjusting unit adjusts the opening degree of the valve step by step according to the valve adjusting coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent speed regulation control, and in particular to an intelligent speed regulation system and a speed regulation method for a special valve of a hydropower station. Background Art

[0002] The automatic control system of a hydropower station is mainly used to adjust the speed of the turbine to meet different power generation needs. It usually includes components such as controllers, sensors, and actuators. Through real-time monitoring and control of the turbine, the power generation efficiency of the hydropower station can be optimized. With the advancement of modern control theory, computer technology, communication technology, and sensor technology, the development of intelligent speed control systems has been promoted.

[0003] The existing intelligent speed control system usually adopts modern control algorithms such as PID control algorithm, fuzzy control algorithm, neural network control algorithm, etc., and uses these algorithms to automatically adjust the control parameters according to the real-time operating status of the turbine to achieve precise control of the turbine speed, so that the intelligent speed control system of the turbine can achieve more precise control and monitoring, thereby improving the operating efficiency and safety of the hydropower station.

[0004] With the improvement of the intelligence level of industrial production, the application demand of intelligent speed control technology in the precise adjustment of turbine valves in hydropower stations is becoming more and more extensive. However, the use of speed regulators that only use analog circuits for control and a single speed control algorithm to control the control parameters of various equipment separately can easily lead to a lack of unified control as a whole, resulting in large power losses; and although the combination of speed regulators and sensors can transmit information in a timely manner through control signals to a certain extent, it is still impossible to achieve the fine adjustment process of the parameters of turbine valves, and lacks timely analysis of motor load conditions and adjustment of operating parameters, thus failing to meet energy-saving needs. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent speed control system and a speed control method for a special valve of a hydropower station, so as to solve the following technical problems: How to use the speed governor to set the opening and closing control method to realize the intelligent control process of the parameter information generated by the turbine valve.

[0006] The purpose of the present invention can be achieved through the following technical solutions: An intelligent speed control system for a special valve of a hydropower station, comprising: A collection unit is used to collect linkage signals of the bypass valve, the main valve and the speed regulating valve according to a preset opening and closing strategy; A conversion unit, used for converting the linkage signal into a water flow state value of the turbine through a first conversion function; the first conversion function is a conversion function between the linkage signal and the water flow state value; the first conversion function is a conversion function after fitting test; The speed regulation analysis unit is used to determine whether the regulation status result of the turbine is abnormal according to the water flow status value: If not, a valve position command is generated according to the flow characteristics of the main valve and enters the speed control unit; If so, a warning signal is generated, and a preset opening and closing strategy adjustment signal is generated; The speed control unit is used to convert the valve position instruction into a valve adjustment instruction through a second conversion function, and obtain the valve adjustment coefficient of the valve adjustment instruction according to iterative calculation; the second conversion function is a conversion function between the valve position instruction and the valve adjustment instruction; the second conversion function is a control algorithm conversion function; The opening adjustment unit is used to adjust the valve opening step by step according to the size of the valve adjustment coefficient.

[0007] Preferably, the start-stop strategy includes: The power distribution performance parameters are collected according to the initial control frequency and the initial opening and closing speed. The order of obtaining the power distribution performance parameters is the bypass valve-main valve-speed regulating valve, and the speed regulator control is started to obtain the power distribution performance parameters; the power distribution performance parameters are the comprehensive parameters of the voltage, current, power and power frequency of each valve under the continuous operation state of the power system of each hydropower station; Adjust the preset opening and closing strategies according to the regulation status results of the turbine.

[0008] Preferably, the linkage signal is obtained in the following manner: Obtaining a time variation curve of power distribution performance parameters within a preset time period; The linkage coefficient is obtained according to the hydraulic system pressure value in the bypass valve-main valve-speed regulating valve time interval corresponding to the time variation curve of the power distribution performance parameter; The linkage coefficient is converted into a linkage signal through digital-to-analog conversion.

[0009] Preferably, the linkage coefficient includes: By formula Calculate and obtain real-time linkage coefficient ; in, , , They are respectively a first preset weight coefficient, a second preset weight coefficient, and a third preset weight coefficient; Real-time power distribution performance parameters for bypass valves; Real-time power distribution performance parameters for the main valve; It is the real-time electrical performance parameter of the speed regulating valve; It is the real-time pressure value of the bypass valve; It is the real-time pressure value of the main valve; It is the real-time pressure value of the speed regulating valve.

[0010] Preferably, the water flow state value is: By formula Calculate the water flow status value ; in, The preset duration; is the first conversion function.

[0011] Preferably, the speed regulation analysis unit determines whether there is an abnormality in the regulation state result of the turbine according to the water flow state value in the following manner: The water flow status value The preset water flow state value standard interval To compare: like , it is judged that the turbine regulation state is normal; like , it is judged that the turbine regulation state is abnormal, and further: like < , it is judged that the regulation state of the turbine is abnormally low; like > , it is judged that the turbine regulation state is abnormally high; in; They are respectively the maximum and minimum values ​​of the preset standard range of water flow state values.

[0012] Preferably, the valve adjustment coefficient is: By formula Calculate the valve adjustment coefficient ; in, is the judgment function, when ≥ When ; is the warning value; when < When ; is the permissible threshold; is the number of iterations, and ∈ ; is the second conversion function; For the Valve position command parameters for iteration; It is the standard valve position command parameter; is the initial value.

[0013] Preferably, the opening adjustment unit performs step-by-step adjustment of the valve opening according to the valve adjustment coefficient as follows: Adjust the valve coefficient The preset threshold range of the throttle adjustment coefficient To compare: like , then it is determined that there is no need to adjust the valve opening; like , then it is determined that the valve opening needs to be adjusted, and further: like < , it is judged that the valve opening needs to be increased, and the opening adjustment level is low; like > , it is judged that the valve opening needs to be adjusted smaller, and the opening adjustment level is high; in, They are respectively the maximum and minimum values ​​of the preset throttle adjustment coefficient threshold range.

[0014] An intelligent speed regulation method for a special valve of a hydropower station, comprising: S1. Collect linkage signals of bypass valve, main valve and speed regulating valve according to preset opening and closing strategies; S2, converting the linkage signal into a water flow state value of the turbine through a first conversion function; the first conversion function is a conversion function between the linkage signal and the water flow state value; the first conversion function is a conversion function after fitting test; S3. Judging whether there is any abnormality in the adjustment state result of the turbine according to the water flow state value: If not, a valve position command is generated and enters the speed control unit; If so, a warning signal is generated, and a preset opening and closing strategy adjustment signal is generated; S4, converting the valve position command into a valve adjustment command through a second conversion function, and obtaining a valve adjustment coefficient of the valve adjustment command according to iterative calculation; the second conversion function is a conversion function between the valve position command and the valve adjustment command; the second conversion function is a control algorithm conversion function; S5. Adjust the valve opening step by step according to the valve adjustment coefficient.

[0015] Beneficial effects of the present invention: (1) The present invention collects linkage signals of the bypass valve, main valve and speed regulating valve according to the preset opening and closing strategy to reflect the overall communication status of the control system, and generates linkage feedback information by sending the working status of different valves to the linkage control end. The linkage signal is converted into the water flow state value of the turbine by setting a conversion unit through a first conversion function, and the state analysis is performed according to the water flow information of the turbine to ensure the reasonable range of the conversion process between the linkage signal feedback information and the water flow state value.

[0016] (2) The present invention realizes further comparison and analysis of the water flow state value by setting a speed regulation analysis unit, and then analyzes the regulation state of the turbine according to the judgment result. When the regulation state is normal, a valve position instruction is generated according to the flow characteristics of the main valve, and then enters the speed regulation control unit; when the regulation state is abnormal, an early warning reminder is generated and an adjustment signal of the preset opening and closing strategy is generated; by flexibly adjusting the opening and closing strategy, the linkage signal collection information is accurately obtained, thereby optimizing the signal collection process.

[0017] (3) The present invention sets a speed control unit to analyze the valve position command, and uses a conversion function to convert it into a valve adjustment command. The valve position command information obtained by each valve reflects the opening information of each valve; and obtains the valve adjustment coefficient of the valve adjustment command according to iterative calculation; by setting an opening adjustment unit, the obtained valve adjustment coefficient is analyzed, and then the valve adjustment command is adjusted, and the valve opening size is adjusted step by step according to needs, ensuring the refinement process of the valve opening size by adjusting the control information method, and realizing the intelligent control process of the turbine valve generation parameter information by using the speed regulator to set the opening and closing control method.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 This is a module diagram of an intelligent speed regulation system for a special valve for a hydropower station according to the present invention; Figure 2 This is a step diagram of an intelligent speed regulation method for a special valve for a hydropower station according to the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 As shown, the present invention is an intelligent speed control system for a special valve of a hydropower station, comprising: A collection unit is used to collect linkage signals of the bypass valve, the main valve and the speed regulating valve according to a preset opening and closing strategy; A conversion unit, used for converting the linkage signal into a water flow state value of the turbine through a first conversion function; the first conversion function is a conversion function between the linkage signal and the water flow state value; the first conversion function is a conversion function after fitting test; The speed regulation analysis unit is used to determine whether the regulation status result of the turbine is abnormal according to the water flow status value: If not, a valve position command is generated according to the flow characteristics of the main valve and enters the speed control unit; If so, a warning signal is generated, and a preset opening and closing strategy adjustment signal is generated; The speed control unit is used to convert the valve position instruction into a valve adjustment instruction through a second conversion function, and obtain the valve adjustment coefficient of the valve adjustment instruction according to iterative calculation; the second conversion function is a conversion function between the valve position instruction and the valve adjustment instruction; the second conversion function is a control algorithm conversion function; The opening adjustment unit is used to adjust the valve opening step by step according to the size of the valve adjustment coefficient.

[0023] In the above technical solution, by designing an intelligent speed control system for special valves of a hydropower station, first, a collection unit is set to realize signal collection, and the collected signal is the linkage signal of the bypass valve, the main valve and the speed control valve according to the preset opening and closing strategy; the linkage signal is used to reflect the overall communication status of the control system, and the linkage feedback information is generated by sending the working status of different valves to the linkage control end. Then, a conversion unit is set to realize the conversion process of the linkage signal, specifically, the linkage signal is converted into the water flow state value of the turbine through the first conversion function, and the state analysis is performed according to the water flow information of the turbine; and the first conversion function is set as a conversion function between the linkage signal and the water flow state value, to ensure the reasonable range of the conversion process between the linkage signal feedback information and the water flow state value.

[0024] Next, a speed regulation analysis unit is set to realize further comparison and analysis of the water flow state value, and then analyze the regulation state of the turbine according to the judgment result. For the case of normal regulation state, a valve position instruction is generated according to the flow characteristics of the main valve, and then enters the speed regulation control unit; for the case of abnormal regulation state, an early warning reminder is generated and an adjustment signal of the preset opening and closing strategy is generated; by adjusting the opening and closing strategy, the linkage signal acquisition information is accurately obtained, and the signal acquisition process is optimized. Among them, the valve position instruction refers to the control instruction of the valve opening in the control system, which means that the valve position controller is used to receive the main controller signal. Each control valve has a valve characteristic calibration, which will be converted from the main controller into a valve position instruction signal. The valve position instruction signal measured on the oil motor is sent to the valve position controller as feedback, and the valve position controller controls the valve position of the regulating valve.

[0025] Furthermore, a speed control unit is provided to analyze the valve position command and convert it into a valve adjustment command using a conversion function. This process also utilizes the valve position command information obtained by each valve to reflect the opening information of each valve. Then, the valve adjustment coefficient of the valve adjustment command is obtained according to iterative calculation. The second conversion function is a conversion function between the valve position command and the valve adjustment command. The valve adjustment command can provide a control command for adjusting the valve opening, and the valve adjustment coefficient can be obtained to provide feedback to guide the generated valve adjustment command result.

[0026] Finally, by setting up the opening adjustment unit, the acquired valve adjustment coefficient is analyzed, and then the valve adjustment instruction is adjusted. The valve opening size is adjusted step by step according to the needs, ensuring the refinement of the valve opening size by adjusting the control information method, and realizing the intelligent control process of the turbine valve generation parameter information.

[0027] Among them, the first conversion function: According to the calculation formula of the water flow state value, the first conversion function Used to set the real-time linkage coefficient within the preset time period The dynamic value of is converted to obtain the water flow state value. The first conversion function is based on the conversion function of fluid mechanics: ;in, is the water flow; Valve opening; is the flow coefficient, is the pressure difference across the valve; In addition, since the linkage signal reflects the cumulative control valve operation status, the valve opening directly and indirectly affects the linkage signal coefficient; and the water flow state value is the cumulative result of the real-time change of the water flow; therefore, the specific conversion function calculation formula can be adjusted as follows:

[0028] in, is the linkage transformation of the accumulated valve opening; therefore, the first transformation function after the fitting test is The formula is:

[0029] The second conversion function: The second conversion function mainly converts the valve position command into the valve adjustment command, and confirms the valve opening size according to the valve adjustment command (confirmed by the valve adjustment coefficient); therefore, the formula of the second conversion function can be expressed as: in Refers to the conversion relationship of valve opening size under the valve adjustment command, which is the proportional coefficient; It is the time required for the valve to open to the maximum under the valve adjustment command; In addition, in a specific application, the first conversion function and the second conversion function can also be determined by a control function obtained by a control algorithm in a PID control system using test data.

[0030] As an implementation mode of the present invention, the opening and closing strategy includes: The power distribution performance parameters are collected according to the initial control frequency and the initial opening and closing speed. The order of obtaining the power distribution performance parameters is the bypass valve-main valve-speed regulating valve, and the speed regulator control is started to obtain the power distribution performance parameters; the power distribution performance parameters are the comprehensive parameters of the voltage, current, power and power frequency of each valve under the continuous operation state of the power system of each hydropower station; Adjust the preset opening and closing strategies according to the regulation status results of the turbine.

[0031] In the above technical scheme, the opening and closing strategy includes the selection of the initial control frequency and the initial opening and closing speed setting, so as to obtain the valve information set in sequence, and the main collection order is: bypass valve-main valve-speed regulating valve; and the opening and closing speed setting is set according to the historical data of the main valve opening and the main valve closing. By starting the speed regulator, the power distribution performance parameters in the process of opening or closing the main valve are obtained, and the turbine regulation state results are analyzed according to the obtained power distribution performance parameters, and then the preset opening and closing strategy is adjusted according to the regulation state results.

[0032] As an implementation mode of the present invention, the linkage signal is obtained in the following manner: Obtaining a time variation curve of power distribution performance parameters within a preset time period; The linkage coefficient is obtained according to the hydraulic system pressure value in the bypass valve-main valve-speed regulating valve time interval corresponding to the time variation curve of the power distribution performance parameter; The linkage coefficient is converted into a linkage signal through digital-to-analog conversion.

[0033] In the above technical scheme, the linkage signal reflects the operating status of the control valve. First, the distribution performance parameter change status is analyzed by obtaining the time change period of the distribution performance parameter within a preset time period, and then the time intervals of the valves arranged in each sequence of the distribution performance parameter time change curve are divided. Then, the hydraulic system pressure value of the corresponding time interval is judged, and then the linkage coefficient is calculated and obtained. Finally, the linkage coefficient is modulated into a linkage signal through analog data, thereby realizing the transmission of the linkage signal.

[0034] During the operation of the hydraulically controlled ball valve for the water inlet of the turbine, the calculation method of the linkage signal of the bypass valve, the main valve and the speed regulating valve is designed based on the preset opening and closing strategy. First, the valve opening process includes: starting the oil pump motor, inputting the pressure oil into the accumulator to the rated pressure of the hydraulic system and then stopping; opening the bypass valve, allowing the medium to flow to the turbine volute through the bypass pipeline, and exhausting the air through the exhaust valve; when the pressure difference before and after the valve reaches the set value, the valve opening cylinder of the water inlet hydraulically controlled ball valve (main valve) moves to open the water inlet hydraulically controlled ball valve; after the water inlet hydraulically controlled ball valve is fully opened, the bypass valve is closed. Second, the valve closing process: opening the bypass valve and conducting the bypass pipeline; the valve closing cylinder of the water inlet hydraulically controlled ball valve moves to close the water inlet hydraulically controlled ball valve; after the hydraulically controlled ball valve is fully closed, the bypass valve is closed.

[0035] As an implementation mode of the present invention, the linkage coefficient includes: By formula Calculate and obtain real-time linkage coefficient ; in, , , They are respectively a first preset weight coefficient, a second preset weight coefficient, and a third preset weight coefficient; Real-time power distribution performance parameters for bypass valves; Real-time power distribution performance parameters for the main valve; It is the real-time electrical performance parameter of the speed regulating valve; It is the real-time pressure value of the bypass valve; It is the real-time pressure value of the main valve; It is the real-time pressure value of the speed regulating valve.

[0036] In the above technical solution, the calculation formula of the linkage coefficient is: Taking the valve opening process as an example, the order of valve opening is: bypass valve - main valve - speed regulating valve; and according to the real-time power distribution performance parameters corresponding to the bypass valve, main valve, and speed regulating valve and the real-time pressure value under the corresponding parameter state, the real-time linkage coefficient is obtained by adding the weight coefficients. ; Then according to the real-time linkage coefficient obtained To obtain the linkage signal, and use the feedback information generated by the linkage signal to feedback the water flow state. , , They are all obtained by fitting historical experience data. After analyzing the comprehensive influence of the ratio of the power distribution performance parameters of the corresponding bypass valve, main valve, and speed control valve and the corresponding real-time pressure value on the output real-time linkage coefficient, numerical simulation weight calculation is performed to select and determine them.

[0037] As an implementation mode of the present invention, the water flow state value is: By formula Calculate the water flow state value ; in, The preset duration; is the first conversion function.

[0038] In the above technical solution, specifically, the water flow state value is obtained by the formula Calculate the water flow status value Among them, the water flow status value can be used to timely judge the changes in the turbine regulation state. When the regulation state is abnormal, an early warning signal is generated, and based on the abnormal regulation state, it is judged whether it is too high or too low, and a preset opening and closing strategy adjustment signal is generated according to the turbine regulation state; when the state is normal, a valve position instruction is generated according to the flow characteristics of the main valve, and then enters the speed control unit to realize step-by-step adjustment of the valve opening size.

[0039] Among them, it needs to be explained that the preset duration To select settings based on empirical data, adaptive adjustments can be made according to specific water flow control requirements; the first conversion function It is obtained by fitting the test data under normal valve working conditions. Therefore, it is judged by substituting the real-time linkage coefficient and feeding back the output water flow state value to realize the result judgment and early warning process.

[0040] As an implementation mode of the present invention, the speed regulation analysis unit determines whether there is an abnormality in the regulation state result of the turbine according to the water flow state value in the following manner: The water flow status value The preset water flow state value standard interval To compare: like , it is judged that the turbine regulation state is normal; like , it is judged that the turbine regulation state is abnormal, and further: like < , it is judged that the regulation state of the turbine is abnormally low; like > , it is judged that the turbine regulation state is abnormally high. Among them; They are respectively the maximum and minimum values ​​of the preset standard range of water flow state values.

[0041] In the above technical solution, the adjustment state results of the turbine are analyzed by comparative analysis, and the standard interval of the water flow state value is set. , for the generated water flow state value The size is divided into situations where it falls within a preset range. If it is within the range, the adjustment state is judged to be normal. If it exceeds the range, the adjustment state is judged to be high, and if it is less than the range, the adjustment state is judged to be low.

[0042] As an implementation mode of the present invention, the valve adjustment coefficient is: The speed control unit is used to convert the valve position instruction into a valve adjustment instruction through a second conversion function, and obtain the valve adjustment coefficient of the valve adjustment instruction according to iterative calculation; the second conversion function is a conversion function between the valve position instruction and the valve adjustment instruction; By formula Calculate the valve adjustment coefficient ; in, is the judgment function, when ≥ When ; is the warning value; when < When ; is the permissible threshold; is the number of iterations, and ∈ ; is the second conversion function; For the Valve position command parameters for iteration; It is the standard valve position command parameter; is the initial value.

[0043] In the above technical solution, the formula Calculate the valve adjustment coefficient , and judge the valve opening size according to the valve adjustment coefficient. First, the information state of the valve position instruction parameter is obtained through the second conversion function, and then the valve adjustment coefficient is calculated through the cumulative change of n iterations to realize the step-by-step adjustment process of the valve opening. And through the judgment function Perform an initial judgment on the number of iterations, and generate a warning value based on the iterative judgment size within its judgment function or perform further calculation adjustments based on the results.

[0044] Among them, it needs to be explained that the standard valve position instruction parameters It is a standard data value obtained based on historical experience, which will not be described in detail here; the second conversion function It is a process of fitting the data of the valve opening adjustment effect value according to the valve position instruction parameters under the normal state of the current valve opening operation; and by substituting To determine the status of the valve position command parameters, and When the range is close to "1", the possibility of needing adjustment is smaller, and the further it deviates from "1", the larger the range of valve opening that needs to be adjusted, and due to the guidance requirements of water flow, in normal valve opening adjustment, adjusting the valve larger is equivalent to following the direction of water flow, and adjusting the valve smaller is equivalent to going against the direction of water flow. Therefore, when the valve is adjusted larger, there is resistance to the water flow, and when it is adjusted smaller, there is resistance to the water flow. Therefore, less electricity is required for increasing the valve than for decreasing it, so it is relatively "easy" to adjust. Therefore, the level of valve increase is lower than the level of valve decrease, and the larger the opening that needs to be increased, the more difficult the adjustment, and the larger the opening that needs to be decreased, the more difficult the adjustment.

[0045] As an implementation mode of the present invention, the opening adjustment unit performs step-by-step adjustment of the valve opening according to the valve adjustment coefficient as follows: Adjust the valve coefficient The preset threshold range of the throttle adjustment coefficient To compare: like , then it is determined that there is no need to adjust the valve opening; like , then it is determined that the valve opening needs to be adjusted, and further: like < , it is judged that the valve opening needs to be increased, and the opening adjustment level is low; like > , it is judged that the valve opening needs to be adjusted down, and the opening adjustment level is high. They are respectively the maximum and minimum values ​​of the preset throttle adjustment coefficient threshold range.

[0046] In the above technical solution, the magnitude of the valve adjustment coefficient is determined by comparison and analysis. When the valve opening is in a normal state, the valve opening is judged to be in a normal state, and for the state of exceeding or insufficient, that is, if < , increase the valve opening, and the opening adjustment level is high; otherwise, reduce the opening, and the opening adjustment level is high.

[0047] See also Figure 2 As shown, the present invention also designs an intelligent speed regulation method for a special valve of a hydropower station, which specifically includes: S1. Collect linkage signals of bypass valve, main valve and speed regulating valve according to preset opening and closing strategies; S2, converting the linkage signal into a water flow state value of the turbine through a first conversion function; the first conversion function is a conversion function between the linkage signal and the water flow state value; the first conversion function is a conversion function after fitting test; S3. Judging whether there is any abnormality in the adjustment state result of the turbine according to the water flow state value: If not, a valve position command is generated and enters the speed control unit; If so, a warning signal is generated, and a preset opening and closing strategy adjustment signal is generated; S4, converting the valve position command into a valve adjustment command through a second conversion function, and obtaining a valve adjustment coefficient of the valve adjustment command according to iterative calculation; the second conversion function is a conversion function between the valve position command and the valve adjustment command; the second conversion function is a control algorithm conversion function; S5. Adjust the valve opening step by step according to the valve adjustment coefficient.

[0048] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0049] The above specific embodiments of this specification are described. Other embodiments are within the scope of the attached documents. In some cases, the actions or steps recorded in this application can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the process depicted in the accompanying drawings does not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0050] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined in this application, they shall all fall within the protection scope of the present invention.

Claims

1. An intelligent speed control system for special valves in a hydropower station, characterized in that: include: A collection unit is used to collect linkage signals of the bypass valve, the main valve and the speed regulating valve according to a preset opening and closing strategy; A conversion unit, used for converting the linkage signal into a water flow state value of the turbine through a first conversion function; the first conversion function is a conversion function between the linkage signal and the water flow state value; the first conversion function is a conversion function after fitting test; The speed regulation analysis unit is used to determine whether the regulation status result of the turbine is abnormal according to the water flow status value: If not, a valve position command is generated according to the flow characteristics of the main valve and enters the speed control unit; If so, a warning signal is generated, and a preset opening and closing strategy adjustment signal is generated; A speed control unit, used for converting the valve position instruction into a valve regulating instruction through a second conversion function, and obtaining a valve regulating adjustment coefficient of the valve regulating instruction according to iterative calculation; the second conversion function is a conversion function between the valve position instruction and the valve regulating instruction; the second conversion function is a control algorithm conversion function; The opening adjustment unit is used to adjust the valve opening step by step according to the size of the valve adjustment coefficient.

2. The intelligent speed control system for special valves of a hydropower station according to claim 1 is characterized in that: The opening and closing strategies include: The power distribution performance parameters are collected according to the initial control frequency and the initial opening and closing speed. The order of obtaining the power distribution performance parameters is the bypass valve-main valve-speed regulating valve, and the speed regulator control is started to obtain the power distribution performance parameters; the power distribution performance parameters are the comprehensive parameters of the voltage, current, power and power frequency of each valve under the continuous operation state of the power system of each hydropower station; Adjust the preset opening and closing strategies according to the regulation status results of the turbine.

3. The intelligent speed control system for special valves of a hydropower station according to claim 2 is characterized in that: The linkage signal is obtained in the following manner: Obtaining a time variation curve of power distribution performance parameters within a preset time period; The linkage coefficient is obtained according to the hydraulic system pressure value in the bypass valve-main valve-speed regulating valve time interval corresponding to the time variation curve of the power distribution performance parameter; The linkage coefficient is converted into a linkage signal through digital-to-analog conversion.

4. The intelligent speed control system for special valves of a hydropower station according to claim 3 is characterized in that: The linkage coefficients include: By formula Calculate and obtain real-time linkage coefficient ; in, , , They are respectively a first preset weight coefficient, a second preset weight coefficient, and a third preset weight coefficient; Real-time power distribution performance parameters for bypass valves; Real-time power distribution performance parameters for the main valve; It is the real-time electrical performance parameter of the speed regulating valve; It is the real-time pressure value of the bypass valve; It is the real-time pressure value of the main valve; It is the real-time pressure value of the speed regulating valve.

5. The intelligent speed control system for special valves of a hydropower station according to claim 4 is characterized in that: The water flow state value is: By formula Calculate the water flow state value ; in, The preset duration; is the first conversion function.

6. The intelligent speed control system for special valves of a hydropower station according to claim 5 is characterized in that: The speed regulation analysis unit determines whether the regulation state result of the turbine is abnormal according to the water flow state value in the following manner: The water flow status value The preset water flow state value standard interval To compare: like , it is judged that the turbine regulation state is normal; like , it is judged that the turbine regulation state is abnormal, and further: like < , it is judged that the turbine regulation state is abnormally low; like > , it is judged that the turbine regulation state is abnormally high; in; They are respectively the maximum and minimum values ​​of the preset standard range of water flow state values.

7. The intelligent speed control system for special valves of a hydropower station according to claim 1 is characterized in that: The valve adjustment coefficient is: By formula Calculate the valve adjustment coefficient ; in, is the judgment function, when ≥ When ; is the warning value; when < When ； is the permissible threshold; is the number of iterations, and ∈ ; is the second conversion function; For the Valve position command parameters for iteration; It is the standard valve position command parameter; is the initial value.

8. The intelligent speed control system for special valves of a hydropower station according to claim 7 is characterized in that: The way in which the opening adjustment unit adjusts the valve opening step by step according to the valve adjustment coefficient is: Adjust the valve coefficient The preset threshold range of the throttle adjustment coefficient To compare: like , then it is determined that there is no need to adjust the valve opening; like , then it is determined that the valve opening needs to be adjusted, and further: like < , it is judged that the valve opening needs to be increased, and the opening adjustment level is low; like > , it is judged that the valve opening needs to be adjusted smaller, and the opening adjustment level is high; in, They are respectively the maximum and minimum values ​​of the preset throttle adjustment coefficient threshold range.

9. An intelligent speed regulation method for a special valve of a hydropower station, characterized in that: The method adopts the intelligent speed control system for a special valve of a hydropower station according to any one of claims 1 to 8, and the method comprises: S1. Collect linkage signals of bypass valve, main valve and speed regulating valve according to preset opening and closing strategies; S2, converting the linkage signal into a water flow state value of the turbine through a first conversion function; the first conversion function is a conversion function between the linkage signal and the water flow state value; the first conversion function is a conversion function after fitting test; S3. Judging whether there is any abnormality in the adjustment state result of the turbine according to the water flow state value: If not, a valve position command is generated and enters the speed control unit; If so, a warning signal is generated, and a preset opening and closing strategy adjustment signal is generated; S4, converting the valve position command into a valve adjustment command through a second conversion function, and obtaining a valve adjustment coefficient of the valve adjustment command according to iterative calculation; the second conversion function is a conversion function between the valve position command and the valve adjustment command; the second conversion function is a control algorithm conversion function; S5. Adjust the valve opening step by step according to the valve adjustment coefficient.

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