A method and system for quickly and accurately judging the switching between the start and stop conditions of a hydropower unit

Abstract

The invention discloses a method and system for quickly and accurately distinguishing the switching of the start-up and shutdown conditions of a hydropower unit. The method comprises: obtaining the start-up and shutdown rules of the unit, recording the start-up curve and the shutdown curve of the unit according to the start-up and shutdown rules, and obtaining a frequency-time relationship curve; parsing the start-up curve and the shutdown curve of the unit to obtain the parsing result, performing equation fitting on the start-up curve and the shutdown curve of the unit according to the parsing result to obtain the fitting equation; performing a first judgment according to the calculation result of the fitting equation to obtain valid data, and using the fitting equation to warn of the risks in the start-up and shutdown process of the unit; calculating the unit speed according to the valid data, performing a second judgment between the unit speed and the actual speed, and performing corresponding operations according to the judgment result, thereby greatly improving the accuracy and reliability of the unit operating condition conversion.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower unit operating condition conversion, and in particular to a method and system for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit. Background Art

[0002] An important part of the automation system of a hydropower plant is the operating condition conversion of the unit, such as startup, grid connection, power generation, and shutdown. The core of the operating condition conversion is the computer monitoring system and the turbine speed control system, which can complete the judgment of the operating condition conversion based on the actual information of the unit collected (voltage, current, switch position, etc. collected by the sensor) and the scientific operating condition conversion conditions established manually, that is, convert from one operating condition to the next. This process must be accurate and correct, and no misjudgment or rejection can be made. There are two key points in the operating condition conversion. First, the correctness and accuracy of the collected information, which depends on the quality of the sensor itself and the filtering and processing of the original signal by technical means. Second, the rationality and scientificity of the conversion logic. That is, the judgment conditions must be strict, and the various conditions input are sufficient conditions for the operating condition conversion. However, in the actual control process of the unit operating condition conversion, the conversion failure often occurs. The general manifestation is that the collected signal is distorted due to electromagnetic and mechanical vibration interference. At this time, if the distorted signal is not processed logically, it will be used as a logical judgment condition and then output, which will lead to misjudgment of the operating condition. For example, the unit speed is often unable to be measured when starting at a low speed; at the moment of unit excitation, the unit speed measurement will be subject to strong electromagnetic interference, etc., which will affect the correct judgment of the operating condition conversion.

[0003] To this end, this paper proposes a precise judgment method for the conversion of the two operating conditions of the unit startup and shutdown. The core is to collect the curves of the unit speed increase and decrease based on the unit inertia characteristics, and then fit the equation. Based on this equation, the relationship between the unit speed (frequency) F and time T is established, and then combined with other conditions, such as guide vane opening, delay, etc., to complete the correct judgment of the operating condition. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method and system for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit to solve the problem that conversion failure often occurs during the control process of actual unit operating condition conversion.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for quickly and accurately distinguishing the switching between the start and stop conditions of a hydropower unit, comprising:

[0008] Obtaining the start-up and shutdown rules of the unit, and recording the start-up curve and the shutdown curve of the unit according to the start-up and shutdown rules;

[0009] Analyzing the startup curve and the shutdown curve of the unit to obtain an analysis result, and performing equation fitting on the startup curve and the shutdown curve of the unit according to the analysis result to obtain a fitting equation;

[0010] Performing a first judgment based on the calculation result of the fitting equation to obtain valid data, and using the fitting equation to issue an early warning of the risks in the process of starting and stopping the unit;

[0011] The unit speed is calculated according to the effective data, a second judgment is made between the unit speed and the actual speed, and a corresponding operation is performed according to the judgment result.

[0012] As a preferred solution of the method for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit according to the present invention, the equation fitting of the start-up curve and the shutdown curve of the unit includes:

[0013] If the recording software comes with a data table, the equations of the unit startup curve and shutdown curve can be directly fitted;

[0014] If the recording software does not have a data table, set a certain number of squares and evenly distribute the start-stop curves on the squares to obtain a plotting diagram of the start-stop curves.

[0015] As a preferred solution of the method for quickly and accurately distinguishing the start-stop working condition conversion of the hydropower unit described in the present invention, it also includes:

[0016] Decompose the plotting point diagram of the start-stop curve to obtain a data table of the start-stop curve;

[0017] The order of the equation is reduced according to the data table, the data in the first interval is discarded, and the fitting equation of the start-stop curve is obtained.

[0018] As a preferred solution of the method for quickly and accurately distinguishing the start-up and shutdown conditions of the hydropower unit described in the present invention, the method of using the fitting equation to warn of the risks in the start-up and shutdown process of the unit includes:

[0019] Compare each startup curve and shutdown curve of the unit to see if they are functionally consistent. If the deviation is greater than a first threshold, the number of startups and shutdowns is accumulated;

[0020] If the number of times the deviation is greater than the first threshold exceeds the set number, an early warning is issued.

[0021] As a preferred solution of the method for quickly and accurately judging the switching of the start-up and shutdown conditions of the hydropower unit described in the present invention, the second judgment between the rotation speed of the unit and the actual rotation speed includes:

[0022] In the unit startup process, if the measured speed of the current unit is greater than the second threshold value, and the function calculated speed is greater than the second threshold value, the guide vane opening is controlled;

[0023] If the speed monitored by the unit is greater than the third threshold and the speed calculated by the function is greater than the third threshold, it enters the no-load state.

[0024] As a preferred solution of the method for quickly and accurately distinguishing the start-stop working condition conversion of the hydropower unit described in the present invention, it also includes:

[0025] In the unit shutdown process, if the measured speed of the unit is less than the fourth threshold value, and the function calculated speed is less than the fourth threshold value, the wind brake control is executed;

[0026] If the speed monitored by the unit is less than the fifth threshold, and the speed calculated by the function is less than the fifth threshold, the unit enters the shutdown state.

[0027] As a preferred solution of the method for quickly and accurately distinguishing the switching of the start-up and shutdown conditions of the hydropower unit described in the present invention, the first judgment based on the calculation result of the fitting equation includes:

[0028] The value calculated by the fitting equation is compared with the actual value. If the deviation between the two is greater than the sixth threshold, the calculation result is invalid; otherwise, it is valid data.

[0029] In a second aspect, the present invention provides a system for quickly and accurately distinguishing the switching between the start and stop conditions of a hydropower unit, comprising:

[0030] A recording module, used to obtain the start-up and shutdown rules of the unit, and record the start-up curve and shutdown curve of the unit according to the start-up and shutdown rules;

[0031] A fitting module, used for analyzing the startup curve and the shutdown curve of the unit to obtain an analysis result, and performing equation fitting on the startup curve and the shutdown curve of the unit according to the analysis result to obtain a fitting equation;

[0032] A first judgment module, used to make a first judgment according to the calculation result of the fitting equation, obtain valid data, and use the fitting equation to warn of risks in the process of starting and stopping the unit;

[0033] The second judgment module is used to calculate the unit speed according to the effective data, perform a second judgment on the unit speed and the actual speed, and perform corresponding operations according to the judgment result.

[0034] In a third aspect, the present invention provides a computing device, comprising:

[0035] Memory and processor;

[0036] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of a method for quickly and accurately distinguishing the switching between the start and stop conditions of a hydropower unit are implemented.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for quickly and accurately determining the switching between the start-up and shutdown operating conditions of the hydropower unit.

[0038] Compared with the prior art, the present invention has the following beneficial effects: the present invention establishes a data function equation by keeping the characteristics of the start-stop curve of the unit unchanged, and uses the equation as an auxiliary judgment method for the start-stop operating condition conversion of the unit, which can greatly improve the accuracy and reliability of the unit operating condition conversion, and prevent the governor from erroneously converting or erroneously opening the unit operating condition, resulting in safety accidents such as the unit overspeeding and the wind brake being mistakenly opened. The established start-stop curve function of the unit can be used as a tool for comparing the start-stop curves of all previous times, and the changes in the unit status can be discovered in advance. By comparing the changes and adopting the probability method, the early warning of unit abnormalities can be completed, providing a method and approach for the long-term safe and stable operation, as well as maintenance and overhaul of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of 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.

[0040] Figure 1 A schematic diagram of the overall process logic of a method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to an embodiment of the present invention;

[0041] Figure 2 A plotting diagram of a startup curve in a method for quickly and accurately distinguishing startup and shutdown conditions of a hydropower unit according to an embodiment of the present invention;

[0042] Figure 3 It is a unit startup curve in a method for quickly and accurately distinguishing the startup and shutdown conditions of a hydropower unit according to an embodiment of the present invention;

[0043] Figure 4 A plotting diagram of a shutdown curve in a method for quickly and accurately distinguishing the start-stop condition conversion of a hydropower unit according to an embodiment of the present invention;

[0044] Figure 5 It is a unit shutdown curve in a method for quickly and accurately distinguishing the start-stop condition conversion of a hydropower unit according to an embodiment of the present invention;

[0045] Figure 6 It is an optimization of the operating condition conversion during the startup process in the method for quickly and accurately distinguishing the startup and shutdown operating condition conversion of a hydropower unit according to an embodiment of the present invention;

[0046] Figure 7 The invention provides an optimization of the operating condition conversion during the shutdown process in a method for quickly and accurately distinguishing the operating condition conversion of a hydropower unit started or shut down according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0048] Example 1

[0049] Reference Figure 1-Figure 7 , which is an embodiment of the present invention, provides a method for quickly and accurately distinguishing the switching between the start and stop conditions of a hydropower unit, comprising:

[0050] S100: Acquire the start-up and shutdown rules of the unit, record the start-up curve and the shutdown curve of the unit according to the start-up and shutdown rules, and obtain the relationship curve between frequency and time;

[0051] In an optional embodiment, the startup rule of the unit can be determined by the manufacturer of the hydro-turbine generator set, and the startup rule, that is, the unit speed (frequency), is obtained through simulation and model testing in the factory, and the position and speed of the guide vane opening are determined, and the governor is allowed to implement it;

[0052] In another optional embodiment, the startup rule of the unit can also be determined by the speed regulator manufacturer, and the startup rule is determined according to the type of unit and in combination with previous engineering experience.

[0053] Specifically, the shutdown rule of the unit includes closing the guide vane opening from the no-load opening to 0 at a certain closing speed, and the unit speed stops naturally. After the start-up and shutdown rules of the unit are determined, that is, the first opening, the second opening, the speed judgment point, etc. are determined, the unit recording is completed during the unit startup process.

[0054] It should be noted that through the professional simulation, model testing and engineering experience of the manufacturer or speed regulator manufacturer, the startup rules of the unit can be accurately determined, which helps to ensure that each stage of the startup process can be carried out according to the predetermined parameters and reduce equipment damage or safety accidents caused by improper operation or incorrect parameter setting.

[0055] S200: analyzing the startup curve and shutdown curve of the unit to obtain an analysis result, and performing equation fitting on the startup curve and shutdown curve of the unit according to the analysis result to obtain a fitting equation;

[0056] S300: Perform a first judgment based on the calculation result of the fitting equation to obtain valid data, and use the fitting equation to issue an early warning of the risks in the process of starting and stopping the unit;

[0057] S400: Calculate the unit speed according to the valid data, make a second judgment between the unit speed and the actual speed, and perform corresponding operations according to the judgment result.

[0058] It should be noted that in the judgment of start-stop conversion, an auxiliary means is introduced. This means is based on the speed increase and decrease curve formed by the unit's own inertia characteristics. Based on this curve, data extraction and equation fitting are completed. According to the equation based on speed and time, the position of the speed per unit time is more accurately known, so as to accurately judge the speed (eliminate the speed outside the equation and select the speed that matches the equation), so as to complete the operating condition conversion more accurately and reliably.

[0059] In the embodiment of the present application, the above step S200 includes the following sub-steps A1-A4:

[0060] In A1: If the recording software comes with a data table, the equations of the unit startup curve and shutdown curve are directly fitted;

[0061] In A2: If the wave recording software does not have a data table, set a certain number of squares, evenly distribute the start-stop curves on the squares, and obtain a plotting diagram of the start-stop curves;

[0062] In A3: decompose the plotting point diagram of the start-stop curve to obtain a data table of the start-stop curve;

[0063] In A4: the order of the equation is reduced according to the data table, the data in the first interval is discarded, and the fitting equation of the start-stop curve is obtained.

[0064] Specifically, if the wave recording software comes with a data table, such as one that can store discrete data in .xls format, the equation of the curve can be fitted. If the wave recording software has limited functions and only has a curve but no data, you can also use A3 graph paper to print the curve, draw points, list it, and fit the equation. The more grids there are, the higher the accuracy. The data in the first interval is determined based on the graph.

[0065] For example, Figure 2As shown, on an A3 document, set a grid of 25 rows and 50 columns, and based on the Xiaowan startup curve as a sample, evenly distribute the startup curve on the grid as finely as possible to obtain a plotting diagram of the startup curve; decompose the plotting diagram, extract the data relationship between the horizontal axis being time and the vertical axis being unit frequency, and establish a data table. The startup curve data table is shown in Table 1;

[0066]

[0067]

[0068] Judging from the curve, in the first 10 seconds, the frequency measurement system could not measure the frequency and voltage amplitude because the unit speed was too slow and the frequency and voltage amplitude were too low. When extracting data, the curve extension method was used to estimate the data between 6 and 10 seconds.

[0069] In order to facilitate equation fitting and reduce the order of equation, the data within 0-6 seconds can be directly discarded and not involved in curve fitting. The curve fitting and equation fitting functions provided by EXCEL are used to establish the unit startup curve and equation. The startup curve equation is: y = -0.0087x 2 +1.4424x-8.6834, where x is time and y is unit speed. The unit startup curve is as follows: Figure 3 As shown;

[0070] like Figure 4 As shown, the unit shutdown curve is placed in an A3 document with 35 rows and 60 columns, and data is extracted to obtain the shutdown curve data table as shown in Table 2;

[0071]

[0072] From the curve, since the unit speed did not change in the first 3 seconds, the order of the equation was reduced, and the data from 0 to 2 seconds were directly discarded and not involved in the curve fitting;

[0073] Using the curve fitting and equation fitting functions of EXCEL, the curve and equation are established. The shutdown curve equation is: y = -0.0006x 3 +0.0767x 2 -3.4867x+61.173, where x is time and y is unit speed. The unit shutdown curve is as follows: Figure 5 As shown;

[0074] It should be noted that by directly using the data table provided by the recording software or the manual dot plotting method, the data of the unit startup and shutdown curves can be obtained more accurately, thereby improving the accuracy of the equation fitting, and it is suitable for recording software with different functions. Whether it is software with data table function or software with only graphic output, it can be processed through corresponding sub-steps, which enhances the adaptability of the method. By setting the number of squares and evenly distributing the curve, the curve characteristics can be captured more finely. By discarding the data in the first interval, the order of the equation can be reduced, the model can be simplified, and at the same time, the impact of abnormal data on the fitting results can be reduced, thereby improving the stability of the model and the accuracy of the prediction.

[0075] In the embodiment of the present application, the first determination in the above step S300 includes the following sub-step B1:

[0076] In B1: the value calculated by the fitting equation is compared with the actual value. If the difference between the two is greater than the sixth threshold, the calculation result is invalid. Otherwise, it is valid data.

[0077] In an optional embodiment, the sixth threshold may be 2.5 Hz or 5%;

[0078] Specifically, according to the relationship equation between the unit frequency and time, the frequency is calculated according to the time, and the calculated value is compared with the actual value. If the deviation between the two is greater than 2.5Hz or greater than 5%, the frequency is invalid and does not participate in the logic control.

[0079] In the embodiment of the present application, after completing step B1, the above step S300 may further include B2-B3:

[0080] In B2: comparing the startup curve and shutdown curve of each unit to see if they are functionally consistent, if the deviation is greater than a first threshold, the startup and shutdown times are accumulated;

[0081] In B3: If the number of times that the deviation is greater than the first threshold exceeds the set number, an early warning is issued.

[0082] In an optional embodiment, the early warning of the risk during the start-up and shutdown process of the unit may be to compare and check the start-up and shutdown process;

[0083] Specifically, the first threshold value may be 5%, the cumulative number of times may be 10 times, and the set number of times may be 8 times, which are set according to experimental conditions;

[0084] Specifically, according to the rules of unit startup and shutdown, this rule is the inherent characteristic of the unit, and is related to mass, shape and friction, which are all fixed quantities. The actual water head size of the unit is different, and the no-load opening size is different, but the unit is running at no-load, and the total energy remains unchanged, so the function equation of the unit speed actually does not change much with the water head (no-load opening size), and the climb and attenuation are only related to the current unit's rotational mechanical energy and its own rotational inertia. Therefore, compare whether the startup and shutdown curves of each unit are consistent with the function. If the deviation is greater than 5%, the unit is started and shut down 10 times in total. If there are 8 large deviations, an early warning can be issued, and the early warning is "abnormal unit startup and shutdown"; if the requirements are not met within 10 times, the judgment will be re-sequentially.

[0085] In another optional embodiment, an early warning may also be provided through a frequency judgment point;

[0086] Specifically, there are two frequency judgment points for the startup condition conversion, which can be 70% and 90%, or 35Hz and 45Hz. Substituting the frequency judgment points and solving the time, the startup condition optimization can be completed in sequence.

[0087] During the shutdown process of the unit, when the speed is lower than 15% or 7.5Hz rated speed, the air brake signal is turned on, and the frequency is substituted into the shutdown equation to calculate the time;

[0088] In another optional embodiment, it can also be a reverse calculation;

[0089] Specifically, for the startup working condition conversion, the timing is started first, the frequency is solved according to the time, and the logic is optimized according to the frequency judgment point;

[0090] During the unit shutdown process, the frequency is reversely calculated through a timer, and the logic is optimized based on the frequency.

[0091] It should be noted that by comparing the values ​​calculated by the fitting equation with the actual values, valid data can be effectively screened out, invalid data caused by interference or errors can be eliminated, and the accuracy of subsequent logical control can be improved. By comparing whether the startup curve and shutdown curve of the unit each time are consistent with the function, abnormal conditions in the operation of the unit can be discovered in time, thereby enhancing the system's abnormality detection capability.

[0092] In the embodiment of the present application, the above step S400 includes the following sub-steps C1-C2:

[0093] In C1: in the unit startup process, if the measured speed of the current unit is greater than the second threshold, and the function calculated speed is greater than the second threshold, the guide vane opening is controlled;

[0094] In C2: if the speed monitored by the unit is greater than the third threshold, and the speed calculated by the function is greater than the third threshold, it enters the no-load state.

[0095] Specifically, the second threshold may be 70%, and the third threshold may be 90%;

[0096] like Figure 6 As shown, when the speed governor receives the start-up command, the timer is started, and the start-up function equation is retrieved at the same time, and the speed of the unit is calculated in real time. In the start-up process, when the measured speed of the unit is greater than 70% and the function-calculated speed is also greater than 70%, the guide vane opening is controlled;

[0097] When the speed monitored by the unit is greater than 90% and the speed calculated by the function is also greater than 90%, it enters the no-load operation.

[0098] In the embodiment of the present application, after completing steps C1-C2, the above step S400 may further include steps C3-C4:

[0099] In C3: in the unit shutdown process, if the measured speed of the unit is less than the fourth threshold value, and the function calculated speed is less than the fourth threshold value, the wind brake control is executed;

[0100] In C4: if the speed monitored by the unit is less than the fifth threshold, and the speed calculated by the function is less than the fifth threshold, then the unit enters the shutdown state.

[0101] Specifically, the fourth threshold may be 15%, and the fifth threshold may be 5%;

[0102] like Figure 7 As shown, when the speed governor receives the shutdown order, the timer is started and the shutdown function equation is called at the same time, and the unit speed is calculated in real time. In the shutdown process, when the measured speed of the unit is less than 15% and the function-calculated speed is also less than 15%, the damper control is executed; when the monitored speed of the unit is less than 5% and the function-calculated speed is also less than 5%, it enters the shutdown state.

[0103] It should be noted that for the automatic conversion of the unit operating conditions, the current method of the hydropower plant is that the speed governor is in automatic, the state is in the "static" condition, and when it receives the "start-up order" issued by the power plant's computer monitoring system, and there is no "shutdown order", the speed governor condition is converted to "start-up". The speed governor opens the guide vane opening to the first opening y1. When the speed rises to 70% of the rated speed, the speed governor opens the guide vane opening to the second opening y2. During this process, the unit speed has been rising. When the speed is greater than 90%, the speed governor converts the operating condition "start-up" to "no-load". When the speed governor is in "no-load", the speed governor frequency adjustment mode intervenes, takes the rated speed as the target, and puts into PID control to keep the unit near the rated speed. From "static" - "start-up" - "no-load", that is, from 0 speed to rated speed, it is called the unit's startup process, and the corresponding operating condition conversion is completed;

[0104] The governor is in no-load condition, the unit is at rated speed, and receives a shutdown command from the monitoring system. The governor condition is switched to "shutdown" and the guide vanes are closed to 0. The unit speed decreases, and when the speed is lower than 15%, the air brake is turned on to make the unit stop quickly. When the unit speed is less than 5% and the guide vane opening is less than 1%, the governor condition is switched to "stationary".

[0105] From the logic, it can be known that the judgment of speed is particularly important. If the speed measurement is improper, the process conversion will be misjudged, especially during the shutdown process. If the speed is not actually lower than 15%, but very high, the frequency measurement is wrong and the detection is lower than 15%, then a signal for electrical braking will be issued; at this time, the huge rotational kinetic energy of the unit will damage the air brake device, causing immeasurable losses.

[0106] The present application proposes to establish a function of the unit start-up and shutdown process curve, as well as a method of how to complete data plotting, extraction, conversion and fitting equations only through the curve, as well as the logic of specific optimization of unit start-up and shutdown, and use the start-up and shutdown curve function as a tool to compare with the actual start-up and shutdown process, perceive the potential changes in the unit state, and use the probability method to complete the early warning. Through the auxiliary judgment of the start-up and shutdown speed function, it is possible to prevent sudden changes and increases in speed measurement, which lead to operating condition conversion errors. Through double verification to perform guide vane opening control and transition to no-load state operation, it is possible to avoid misoperation caused by a single measurement error or equipment failure, thereby enhancing the safety of unit operation. The real-time computer unit speed and combined with the preset threshold can ensure that the unit responds in time when it reaches a specific speed, optimize the unit's response time and transition process, and accurately control the unit's start-up and shutdown process. It can reduce additional energy loss caused by improper operation and improve energy utilization efficiency.

[0107] The above is a schematic scheme of a method for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit in this embodiment. It should be noted that the technical scheme of the system for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit and the technical scheme of the method for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit belong to the same concept. For details not described in detail in the technical scheme of the system for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit in this embodiment, please refer to the description of the technical scheme of the method for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit.

[0108] The system for quickly and accurately distinguishing the start-stop working condition conversion of a hydropower unit in this embodiment includes:

[0109] A recording module, used to obtain the start-up and shutdown rules of the unit, and record the start-up curve and shutdown curve of the unit according to the start-up and shutdown rules;

[0110] A fitting module, used for analyzing the startup curve and the shutdown curve of the unit to obtain an analysis result, and performing equation fitting on the startup curve and the shutdown curve of the unit according to the analysis result to obtain a fitting equation;

[0111] A first judgment module, used to make a first judgment according to the calculation result of the fitting equation, obtain valid data, and use the fitting equation to warn of risks in the process of starting and stopping the unit;

[0112] The second judgment module is used to calculate the unit speed according to the effective data, perform a second judgment on the unit speed and the actual speed, and perform corresponding operations according to the judgment result.

[0113] This embodiment also provides a computing device suitable for quickly and accurately judging the switching between the start and stop conditions of a hydropower unit, including:

[0114] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the method for quickly and accurately distinguishing the start-stop operating condition conversion of the hydropower unit as proposed in the above embodiment.

[0115] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for quickly and accurately distinguishing the switching between the start and stop conditions of a hydropower unit as proposed in the above embodiment is implemented.

[0116] The storage medium proposed in this embodiment and the method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit proposed in the above embodiment belong to the same inventive concept. For technical details not described in detail in this embodiment, please refer to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0117] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0118] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for quickly and accurately distinguishing the switching of the start-stop working conditions of a hydropower unit, characterized in that: include: Obtaining the start-up and shutdown rules of the unit, and recording the start-up curve and the shutdown curve of the unit according to the start-up and shutdown rules; Analyzing the startup curve and the shutdown curve of the unit to obtain an analysis result, and performing equation fitting on the startup curve and the shutdown curve of the unit according to the analysis result to obtain a fitting equation; Performing a first judgment based on the calculation result of the fitting equation to obtain valid data, and using the fitting equation to issue an early warning of the risks in the process of starting and stopping the unit; The unit speed is calculated according to the effective data, a second judgment is made between the unit speed and the actual speed, and a corresponding operation is performed according to the judgment result.

2. The method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to claim 1, characterized in that: The equation fitting of the unit startup curve and shutdown curve includes: If the recording software comes with a data table, the equations of the unit startup curve and shutdown curve can be directly fitted; If the recording software does not have a data table, set a certain number of squares and evenly distribute the start-stop curves on the squares to obtain a plotting diagram of the start-stop curves.

3. The method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to claim 1 or 2, characterized in that: Also includes: Decompose the plotting point diagram of the start-stop curve to obtain a data table of the start-stop curve; The order of the equation is reduced according to the data table, the data in the first interval is discarded, and the fitting equation of the start-stop curve is obtained.

4. The method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to claim 3, characterized in that: Using the fitting equation to warn of risks during the start-up and shutdown of the unit includes: Compare each startup curve and shutdown curve of the unit to see if they are functionally consistent. If the deviation is greater than a first threshold, the number of startups and shutdowns is accumulated; If the number of times the deviation is greater than the first threshold exceeds the set number, an early warning is issued.

5. The method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to claim 4, characterized in that: The second determination of the unit speed and the actual speed includes: In the unit startup process, if the measured speed of the current unit is greater than the second threshold value, and the function calculated speed is greater than the second threshold value, the guide vane opening is controlled; If the speed monitored by the unit is greater than the third threshold and the speed calculated by the function is greater than the third threshold, it enters the no-load state.

6. The method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to claim 5, characterized in that: Also includes: In the unit shutdown process, if the measured speed of the unit is less than the fourth threshold value, and the function calculated speed is less than the fourth threshold value, the wind brake control is executed; If the speed monitored by the unit is less than the fifth threshold, and the speed calculated by the function is less than the fifth threshold, the unit enters the shutdown state.

7. The method for quickly and accurately distinguishing the start-stop operating condition conversion of a hydropower unit according to claim 6, characterized in that: Performing a first judgment according to the calculation result of the fitting equation includes: The value calculated by the fitting equation is compared with the actual value. If the deviation between the two is greater than the sixth threshold, the calculation result is invalid; otherwise, it is valid data.

8. A system using the method for quickly and accurately distinguishing the start-stop condition conversion of a hydropower unit as claimed in any one of claims 1 to 7, characterized in that: include: A recording module, used to obtain the start-up and shutdown rules of the unit, and record the start-up curve and shutdown curve of the unit according to the start-up and shutdown rules; A fitting module, used for analyzing the startup curve and the shutdown curve of the unit to obtain an analysis result, and performing equation fitting on the startup curve and the shutdown curve of the unit according to the analysis result to obtain a fitting equation; A first judgment module, used to make a first judgment according to the calculation result of the fitting equation, obtain valid data, and use the fitting equation to warn of risks in the process of starting and stopping the unit; The second judgment module is used to calculate the unit speed according to the effective data, perform a second judgment on the unit speed and the actual speed, and perform corresponding operations according to the judgment result.

9. An electronic device, comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for quickly and accurately distinguishing the start-up and shutdown conditions of a hydropower unit as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for quickly and accurately distinguishing the start-stop operating condition transition of a hydropower unit as described in any one of claims 1 to 7.

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