Flow detection method and system based on electric power index method

Abstract

The invention provides a flow detection method and system based on an electric power index method, and the method comprises the steps: building an electric power-flow relation model based on the electric power index method, and obtaining the actual measurement power generation power of a generator; and inputting the actually measured power generation power into the electric power-flow relation model based on the power index method to obtain the power generation flow. The method is improved and innovated on the basis of the basic principle that the hydropower station uses a hydraulic factor method to calculate the flow, compared with an original monitoring method needing three factors, the method is simple in mathematical model, the power generation flow of the generator set can be calculated only through one electric power factor, the power generation flow calculation process is simplified, and the calculation efficiency is improved. Requirements on hardware facilities are reduced, labor intensity can be reduced, and working efficiency and power generation flow detection precision are improved. The method for calculating the flow through the electric power is popularized for power stations of the same kind, the water consumption statistical quality can be improved, and support is provided for strictest water resource management.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrological monitoring, and more specifically, to a flow detection method and system based on an electric power index method. Background Art

[0002] With the rapid development of hydropower stations, hydropower stations in various places have reached a very high installed capacity. These hydropower stations have played an important role in economic development and reducing carbon emissions, and have accumulated a lot of operating experience. Hydropower stations are hydraulic structures that convert water energy into electrical energy, and their conversion has a stable relationship. Domestic scholars have conducted a lot of research on this. Xu Wei and others conducted case studies based on the historical operation process of Hongjiadu Power Station, analyzed the functional relationship between the comprehensive output coefficient and the head and power generation flow, aiming to provide basic support for the refined scheduling and scientific decision-making of hydropower stations. Wang Xianxun and others proposed three factors through research, namely reservoir water level, tail water level, and power generation flow, which essentially affect the efficiency of water resource utilization by affecting the power generation head of the hydropower station. Chen Senlin and others proposed a recursive calculation method for the power generation flow of hydropower units at a fixed load. Gou Lu and others studied the variation law and application of the comprehensive output coefficient of hydropower stations. Lin Zhiqiang and others took Longjiang Hydropower Station as an example to establish a model function based on the historical operation data of the hydropower station to simulate the single-unit output coefficient of the hydropower station, and then gave a calculation method for the comprehensive output coefficient of the hydropower station.

[0003] Flow measurement through hydraulic structure method is an important method of hydrological station. The relevant specifications have specific requirements for its measurement compilation, and many scholars have studied it. Li Kai et al. calculated the flow through the power generation data of Danjiangkou Reservoir and compared the results of hydrological monitoring. The results show that the error of runoff calculated by using the power generation data of the reservoir is less than the specification requirements. Wang Zenghai studied the calculation method of power generation flow of hydropower stations and proposed a single-machine flow and power calculation formula that can be applied to various situations of various power stations. Taking Lushui Hydropower Station as an example, Wang Li et al. used the measured flow data and measured power generation to calibrate its comprehensive efficiency coefficient, and the accuracy met the requirements of relevant specifications.

[0004] The above studies are all based on the establishment of a relationship between flow and water level (head), electric power, and comprehensive efficiency. The relationship is relatively complex, and the comprehensive efficiency and head cannot be directly observed. The calculation of head is divided into two types according to the type of turbine. When the turbine is a reaction type, it is necessary to monitor the upstream and downstream water levels of the hydropower station at the same time. The difference between the upstream and downstream water levels is the head; when the turbine is an impulse type, it is necessary to monitor the upstream water level of the hydropower station and measure the center elevation of the turbine nozzle. The difference between the upstream water level of the hydropower station and the center elevation of the nozzle is the head. The comprehensive efficiency requires simultaneous measurement of flow, monitoring of electric power, calculation of head, and substitution into formula (1) to obtain the result. Then, a curve of the relationship between electric power and comprehensive efficiency is established. Take the operation of a single generator as an example: (1) Where: ——Power generation flow, in m³ / s; ——electrical power, in kW; - overall efficiency; ——Measured water head, in meters; for reaction turbines, the measured water head is the water level difference between the upstream and downstream of the power station. For the impulse turbine, the measured water head It is the difference between the upstream water level of the hydropower station and the center elevation of the nozzle.

[0005] When calculating the flow rate, the corresponding comprehensive efficiency is calculated based on the relationship curve between the electric power and the comprehensive efficiency from the electric power of the hydropower station, the head is calculated using the monitored water level, and then the power generation flow is calculated according to formula (1). However, the calculation process is complicated, time-consuming and labor-intensive, especially for low-head hydropower stations with incomplete observation facilities, especially for a large number of rural hydropower stations, it is difficult to obtain accurate head observation data, which further increases the difficulty of calculating the flow rate. Summary of the invention

[0006] In view of the technical problems existing in the prior art, the present invention provides a flow detection method and system based on the electric power index method, which simplifies the calculation process of the power generation flow of the hydropower station and reduces the hardware facility requirements for the power generation flow monitoring of the hydropower station. It is particularly suitable for low-head hydropower stations with incomplete observation facilities.

[0007] According to a first aspect of the present invention, there is provided a flow detection method based on an electric power index method, comprising: Obtain the measured power generation of the generator; The measured generated power is input into an electric power-flow relationship model based on a power index method to obtain the generated power flow.

[0008] Based on the above technical solution, the present invention can also make the following improvements.

[0009] Optionally, the method further includes constructing an electric power-flow relationship model based on a power index method, specifically including: An electric power-flow relationship model is established based on a power index method, and fixed parameters of the electric power-flow relationship model are obtained by fitting according to the measured power generation flow and the measured power generation power; The power generation flow test value is calculated according to the fitted power-flow relationship model, and the fixed parameters of the power-flow relationship model are optimized according to various errors of the power generation flow test value.

[0010] Optionally, the electric power-flow relationship model established based on the power index method is expressed as: , in, is the coefficient, is the measured power generation of the generator, is the power index, The power generation flow.

[0011] Optionally, the establishing of the electric power-flow relationship model based on the power index method includes: Construct the power generation flow calculation formula (1): (1), In formula (1), is the power generation flow, is the measured power generation, 9.8 is the value of gravity acceleration, For overall efficiency, is the measured water head; Construct the relationship between the generator's power generation and comprehensive efficiency (2): (2), In formula (2), is a constant to be determined, is the rated power or limited output power of the generator. is the power index; Substituting formula (2) into formula (1) yields flow calculation formula (3): (3), Using the logarithmic graphical method for equation (3), we can obtain the flow relationship equation (4): (4), In formula (4), is the coefficient to be determined, is the head index; Simplify equation (4) and let , we get formula (5): (5), In formula (5), K is the unknown coefficient.

[0012] Optionally, fitting the fixed parameters of the electric power-flow relationship model according to the measured power generation flow and the measured power generation power includes: The electric power-flow relationship model is fitted according to the measured power generation flow and the measured power generation power to obtain a plurality of coefficient candidate values ​​and power index candidate values.

[0013] Optionally, the calculating the power generation flow test value according to the fitted power generation flow test value, and optimizing the fixed parameters of the power generation flow relationship model according to various errors of the power generation flow test value, include: Substituting the coefficient candidate value and the power index candidate value into the calculation formula of the electric power-flow relationship model to calculate the power generation flow test value; Counting various errors between the power generation flow test value and the actual power generation flow; Eliminate the coefficient alternative values ​​and power index alternative values ​​that fail the error test; Find a value with better accuracy from the coefficient candidate values ​​and power index candidate values ​​that have passed the error test.

[0014] Optionally, the errors include at least systematic errors and / or random uncertainties.

[0015] According to a second aspect of the present invention, there is provided a flow detection system based on an electric power index method, comprising: An acquisition module, used to acquire the actual power generation of the generator; A flow calculation module, used for inputting the measured power generation power into an electric power-flow relationship model based on a power index method to obtain a power generation flow; Optionally, the system further includes a model building module for building an electric power-flow relationship model based on a power index method; the model building module includes a building and fitting submodule and an optimization submodule, wherein: The construction and fitting submodule is used to establish an electric power-flow relationship model based on the power index method, and to fit the fixed parameters of the electric power-flow relationship model according to the measured power generation flow and the measured power generation power; The optimization submodule is used to calculate the power generation flow test value according to the fitted power generation flow test value, and optimize the fixed parameters of the power generation flow relationship model according to various errors of the power generation flow test value.

[0016] According to a third aspect of the present invention, there is provided an electronic device comprising a memory and a processor, wherein the processor is used to implement the steps of a flow detection method based on an electric power index method when executing a computer management program stored in the memory.

[0017] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium on which a computer management program is stored, and when the computer management program is executed by a processor, the steps of a flow detection method based on an electric power index method are implemented.

[0018] The present invention provides a flow detection method, system, electronic device and storage medium based on the electric power index method, establishes an electric power-flow relationship model based on the electric power index method, and improves and innovates the basic principle of using the hydraulic factor (electric power) method to deduce the flow in a hydropower station. Compared with the original monitoring method that requires three factors, the mathematical model of this method is simple, and only one factor of electric power is needed to calculate the power generation flow of the generator set, which simplifies the power generation flow calculation process and reduces the requirements for hardware facilities. After the fixed parameters (such as undetermined parameters and indexes) are determined by fitting, the present invention can deduce the power generation flow according to the measured power generation power, which is convenient for computer processing and analysis, greatly improves work efficiency, and reduces manual labor intensity. For low-head hydropower stations with incomplete observation facilities, especially for a large number of rural hydropower stations, a new perspective and technical path are provided, which has good application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of a flow detection method based on an electric power index method provided in a certain embodiment; Figure 2 A flow chart of a flow detection method based on an electric power index method provided in yet another embodiment; Figure 3 A diagram showing the relationship between electric power and flow for a hydropower station; Figure 4 A flow detection system block diagram based on an electric power index method is provided for a certain embodiment; Figure 5 A schematic diagram of the hardware structure of a possible electronic device provided by the present invention; Figure 6 A schematic diagram of the hardware structure of a possible computer-readable storage medium provided by the present invention. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Figure 1 A flow chart of a flow detection method based on electric power index method provided by the present invention is as follows: Figure 1 As shown, the method comprises the steps of: Get the power generated by the generator; The measured generated power is input into an electric power-flow relationship model based on a power index method to obtain the generated power flow.

[0022] It is understandable that, based on the defects in the background technology, the embodiment of the present invention proposes a flow detection method based on the electric power index method. Compared with the original monitoring method shown in the background technology, which requires three factors to participate in the calculation, the mathematical model of this method is simple, and only one factor of electric power is needed to calculate the power generation flow of the generator set, which simplifies the power generation flow estimation process and reduces the requirements for hardware facilities. After the fixed parameters (such as undetermined parameters and indexes) are determined by fitting, the present invention can deduce the power generation flow according to the measured power generation power, which is convenient for computer processing and analysis, greatly improves work efficiency, and reduces manual labor intensity. For low-head hydropower stations with incomplete observation facilities, especially for a large number of rural hydropower stations, a new perspective and technical path are provided, which has good application prospects and promotion value. The method of deriving flow by electric power in this embodiment can be promoted to similar power stations to improve the statistical quality of water consumption and provide support for the most stringent water resources management.

[0023] In one possible implementation, Figure 2 As shown, the method also includes constructing an electric power-flow relationship model based on the power index method, specifically including: An electric power-flow relationship model is established based on the power index method, and fixed parameters of the electric power-flow relationship model, such as model coefficients and power index, are obtained by fitting according to the measured power generation flow and the measured power generation power; The fixed parameters obtained by fitting are substituted into the electric power-flow relationship model to obtain the fitted electric power-flow relationship model; the power generation flow test value is calculated according to the fitted electric power-flow relationship model, and the fixed parameters of the electric power-flow relationship model are optimized according to the various errors of the power generation flow test value to screen out the electric power-flow relationship model with higher accuracy.

[0024] In a possible implementation manner, the establishment of the electric power-flow relationship model based on the power index method includes steps S101 to S105.

[0025] S101, construct the power generation flow calculation formula (1): (1), In formula (1), is the power generation flow, in m³ / s; It is the measured single-machine power generation, in kW; 9.8 is the value of gravity acceleration, in m / s²; For overall efficiency; is the measured water head, i.e. water level, in m. For a reaction turbine, is the water level difference between upstream and downstream of the power station; for the impulse turbine, It is the difference between the upstream water level of the hydropower station and the center elevation of the nozzle.

[0026] It is understandable that starting from the operation of the upstream hydraulic engineering (power station), a mathematical relationship model between hydraulic factors (power generation) and flow is established. When the generator set does not change and the relationship is relatively stable, the flow can be estimated based on the operation record of the power station. Since a hydroelectric power station is a hydraulic structure that converts water energy into electrical energy, the main working parameters are head, flow, efficiency, and electrical power. The power generation flow formula given in the hydrological data compilation specification and other textbooks is shown in formula (1). Therefore, the water flow rate when the hydroelectric power station is generating electricity can be calculated by formula (1).

[0027] S102, build the power generation and comprehensive efficiency of the generator The relationship (2): (2), In formula (2), is a constant to be determined; The rated power or limited output power of the generator, in kW; is the power index.

[0028] It is understandable that when the hydropower station is operating at full load, the overall efficiency The value does not change much. The rated power is not reached or the output power is limited. When the difference is large, the comprehensive efficiency can be determined by the measured power generation. and Establish the relationship according to formula (2).

[0029] S103, the comprehensive efficiency of formula (2) Substituting into formula (1) we get flow calculation formula (3): (3).

[0030] S104, as can be seen from formula (3), the outflow of a single hydropower station mainly depends on the changes of two factors: electric power and water head. Therefore, it is not necessary to analyze the comprehensive efficiency. The numerical value is directly obtained by using the logarithmic graphical method to obtain the flow relationship. Therefore, in this step, the logarithmic graphical method is used for equation (3) to obtain the flow relationship (4): (4), In formula (4), is the coefficient to be determined, is the water head index.

[0031] S105, in the run-of-river power station scenario, the water head amplitude is small, and the flow calculation formula (4) The influence on the flow rate can be expressed by the undetermined coefficient, so the formula (4) is simplified to , we get formula (5): (5), In formula (5), K is the unknown coefficient.

[0032] Therefore, the electric power-flow relationship model established based on the power index method is obtained through the above steps S101 to S105.

[0033] In a possible implementation manner, the method of fitting the fixed parameters of the electric power-flow relationship model according to the measured power generation flow and the measured power generation power includes: The electric power-flow relationship model is fitted according to the measured power generation flow and the measured power generation power to obtain a plurality of coefficient candidate values ​​and power index candidate values.

[0034] In a possible embodiment, the step of calculating the power generation flow test value according to the fitted power-flow relationship model and optimizing the fixed parameters of the power-flow relationship model according to various errors of the power generation flow test value includes: Substituting the coefficient candidate value and the power index candidate value into the calculation formula of the electric power-flow relationship model to calculate the power generation flow test value; Counting various errors between the power generation flow test value and the measured power generation flow, wherein the various errors at least include systematic errors and / or random uncertainties; Eliminate the coefficient alternative values ​​and power index alternative values ​​that fail the error test; Find a value with better accuracy from the coefficient candidate values ​​and power index candidate values ​​that have passed the error test.

[0035] It can be understood that, from the brief description of the electric power-flow relationship model based on the power index method shown in the above embodiments, the coefficients to be determined can be determined by fitting according to the measured power flow and power generation in the operation data of the hydropower station. and power index . Perform various error statistics and tests on the fitted power generation flow, and select the undetermined coefficients that pass the test and whose error indicators meet the requirements of line determination accuracy. and index is a determined parameter. According to the determined coefficients , Power Index and the generated power, the generated power flow can be deduced according to formula (5).

[0036] A specific implementation scenario is now used as an example to illustrate.

[0037] Take a runoff power station in a certain river basin as an example. For the convenience of the following description, the normal water level of the reservoir of the runoff power station is 218.00m, the dead water level is 213.00m, the bottom elevation of the power generation water inlet is 199m, and the head variation range is small. Taking the measured flow data of the hydrological station near the runoff power station in three years and the operation data of the runoff power station as examples, the flow calculated by the method of the present invention is analyzed.

[0038] 1. Establishment of electric power-flow relationship model based on power index method The actual flow rates measured 53 times under the power generation conditions of different units of the run-of-river power station in three years were sorted out, including 36 times of actual flow rates when 3 units were generating electricity, 12 times of actual flow rates when 2 units were generating electricity, and 5 times of actual flow rates when 1 unit was generating electricity. At the same time, the operation records of the run-of-river power station units at the corresponding time were collected, the power generation efficiency was calculated, and a statistical table of electric power and measured flow data was constructed.

[0039] According to the statistical table data of the electric power and the measured flow rate, the functional relationship between the measured power generation flow and the power generation index is established, and the relationship is Q=5.834401N 0.994382 , that is, K=5.834401, α=0.994382.

[0040] 2. Relationship line error statistics The relationship between the electric power and the measured flow data is shown in the table below: Figure 3 shown.

[0041] According to the requirements of the water level-flow relationship alignment accuracy index table in Table 3.3.2-1 of the "Specifications for the Compilation of Hydrological Data" (SL247-2012), when a Class I precision hydrological station uses the hydraulic factor legal alignment, the system error shall not exceed ±2% and the random uncertainty shall not exceed 10%.

[0042] The total power generation index method is used to calculate the online flow rate, the formula is Q=5.834401N 0.994382 , and for Figure 3 The relationship line shown was subjected to three tests (sign test, line fit test, and deviation value test), with a sample capacity of 53, 29.5 positive signs, 26 sign exchanges, 0.1% systematic error, and 9.0% random uncertainty, meeting the requirements of the "Specifications for the Compilation of Hydrological Data" (SL247-2012) that the systematic error of the relationship line for a Class I precision hydrological station using the hydraulic factor method shall not exceed ±2%, and the random uncertainty shall not exceed 10%.

[0043] 3. Analysis of flow error statistics The electric power of the runoff power station in the first and second years in the statistical table of electric power and measured flow data is used to deduce the flow of the nearby hydrological stations in the first and second years respectively through the above formula for compilation, and the error statistics of the runoff totals in each period of the compiled results and the runoff totals in each period of the first and second years of the original published results are performed. From the error statistical results, it can be seen that the total runoff in each period derived by the power generation index method of the runoff power station meets the requirements of Article 4.5.3 of the "Hydrological Patrol Specifications" (SL195-2015): the allowable error of the annual total of a Class I precision station is ±2%, the allowable error of the total water volume in the flood season is ±2.5%, and the allowable error of the total volume of a flood is ±3%.

[0044] 4. Results Analysis (1) The mathematical model of the electric power-flow relationship established by the electric power index method is simple, requiring only one factor of the power generation, without the need to observe the water head and deduce the comprehensive efficiency. The undetermined coefficients are determined by fitting After the exponent α is calculated, the power generation flow can be deduced. This method is convenient for computer processing and analysis, reduces human labor intensity and improves work efficiency.

[0045] (2) Taking the measured flow data of a selected three-year hydrological station and the operation data of the run-of-river power station as examples for analysis, the results show that the electric power-flow relationship line established by the electric power index method can pass three tests (sign test, line fit test, and deviation value test); the relationship line system error is 0.1%, and the random uncertainty is 9.0%, which meets the requirements of the "Specification for the Compilation of Hydrological Data" (SL / T 247-2020) that the system error of the line determined by the hydraulic factor method for a Class I precision hydrological station shall not exceed ±2%, and the random uncertainty shall not exceed 10%. It can be applied to the station's line determination and flow prediction, improve the quality and efficiency of hydrological test compilation, and reduce the labor intensity of grassroots employees. It has certain promotion significance for hydrological stations of the same type.

[0046] (3) By analyzing the data in the above statistical table of electric power and measured flow data, the absolute value of the relative error of the flow calculated by the electric power-flow relationship established by measuring two flow rates (i.e., 6 times) for each power generation operation condition and the relationship established by multiple flow measurements (53 times) is within 5%. When the measured flow rate is 20 times, the absolute value of the relative error of the flow is within 1.5%, and when the measured flow rate is 30 times, the absolute value of the relative error of the flow is within 0.5% (the results of statistical analysis of different sampling plans may be different). The absolute value of the relative error of the flow calculated by the electric power-flow relationship established by the design flow without measured data is also within 7%.

[0047] (4) This method provides a new path for calculating the flow rate of a large number of rural hydropower stations, especially low-head hydropower stations with incomplete water level observation facilities, improving the quality of water consumption statistics, and providing data support for the most stringent water resources management. It has good application prospects and promotion value.

[0048] (5) Through theoretical derivation and case application analysis, the power index method to establish the electric power-flow relationship is suitable for run-of-river power stations with small head fluctuations.

[0049] Figure 4 A flow detection system structure diagram based on the electric power index method provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, a flow detection system based on the electric power index method includes an acquisition module and a flow calculation module, wherein: An acquisition module, used to acquire the actual power generation of the generator; The flow calculation module is used to input the measured power generation power into the power-flow relationship model based on the power index method to obtain the power generation flow.

[0050] It can be understood that the flow detection system based on the electric power index method provided by the present invention corresponds to the flow detection method based on the electric power index method provided in the aforementioned embodiments. The relevant technical features of the flow detection system based on the electric power index method can refer to the relevant technical features of the flow detection method based on the electric power index method, which will not be repeated here.

[0051] In a possible embodiment, Figure 4 As shown, the system further includes: a model building module for building an electric power-flow relationship model based on a power index method; The model building module includes a building and fitting submodule and an optimization submodule, wherein: The construction and fitting submodule is used to establish an electric power-flow relationship model based on the power index method, and to fit the fixed parameters of the electric power-flow relationship model according to the measured power generation flow and the measured power generation power; The optimization submodule is used to calculate the power generation flow test value according to the fitted power generation flow test value, and optimize the fixed parameters of the power generation flow relationship model according to various errors of the power generation flow test value.

[0052] See also Figure 5 , Figure 5 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 5As shown, an embodiment of the present invention provides an electronic device 500, including a memory 510, a processor 520, and a computer program 511 stored in the memory 510 and executable on the processor 520. When the processor 520 executes the computer program 511, the following steps are implemented: Obtain the measured power generation of the generator; The measured generated power is input into an electric power-flow relationship model based on a power index method to obtain the generated power flow.

[0053] See also Figure 6 , Figure 6 Schematic diagram of an embodiment of a computer-readable storage medium provided by the present invention. Figure 6 As shown, this embodiment provides a computer-readable storage medium 600, on which a computer program 611 is stored. When the computer program 611 is executed by a processor, the following steps are implemented: Obtain the measured power generation of the generator; The measured generated power is input into an electric power-flow relationship model based on a power index method to obtain the generated power flow.

[0054] The embodiment of the present invention provides a flow detection method, system, electronic device and storage medium based on the electric power index method, establishes an electric power-flow relationship model based on the electric power index method, and improves and innovates the basic principle of using the hydraulic factor (electric power) method to deduce the flow in a hydropower station. Compared with the original monitoring method that requires three factors, the mathematical model of this method is simple, and only one factor of electric power is needed to calculate the power generation flow of the generator set, which simplifies the power generation flow calculation process and reduces the requirements for hardware facilities. After the fixed parameters (such as undetermined parameters and indexes) are determined by fitting, the present invention can deduce the power generation flow according to the measured power generation power, which is convenient for computer processing and analysis, greatly improves work efficiency, and reduces manual labor intensity. For low-head hydropower stations with incomplete observation facilities, especially for a large number of rural hydropower stations, a new perspective and technical path are provided, which has good application prospects and promotion value.

[0055] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0057] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A flow detection method based on electric power index method, characterized in that: include: Obtain the measured power generation of the generator; The measured generated power is input into an electric power-flow relationship model based on a power index method to obtain the generated power flow.

2. A flow detection method based on electric power index method according to claim 1, characterized in that: It also includes the construction of an electric power-flow relationship model based on the power index method, including: An electric power-flow relationship model is established based on a power index method, and fixed parameters of the electric power-flow relationship model are obtained by fitting according to the measured power generation flow and the measured power generation power; The power generation flow test value is calculated according to the fitted power-flow relationship model, and the fixed parameters of the power-flow relationship model are optimized according to various errors of the power generation flow test value.

3. A flow detection method based on electric power index method according to claim 2, characterized in that: The electric power-flow relationship model established based on the power index method is expressed as: ， in, is the coefficient, is the measured power generation of the generator, is the power index, The power generation flow.

4. A flow detection method based on electric power index method according to claim 2 or 3, characterized in that: The electric power-flow relationship model is established based on the power index method, including: Construct the power generation flow calculation formula (1): （1）， In formula (1), is the power generation flow, is the measured power generation, 9.8 is the value of gravity acceleration, For overall efficiency, is the measured water head; Construct the relationship between the generator's power generation and comprehensive efficiency (2): （2）， In formula (2), is a constant to be determined, is the rated power or limited output power of the generator. is the power index; Substituting formula (2) into formula (1) yields flow calculation formula (3): （3）， Using the logarithmic graphical method for equation (3), we can obtain the flow relationship equation (4): （4）， In formula (4), is the coefficient to be determined, is the head index; Simplify equation (4) and let , we get formula (5): （5）， In formula (5), K is the unknown coefficient.

5. The flow detection method based on the electric power index method according to claim 3 is characterized in that: The fixed parameters of the electric power-flow relationship model are obtained by fitting according to the measured power generation flow and the measured power generation power, including: The electric power-flow relationship model is fitted according to the measured power generation flow and the measured power generation power to obtain a plurality of coefficient candidate values ​​and power index candidate values.

6. A flow detection method based on electric power index method according to claim 5, characterized in that: The step of calculating the power generation flow rate test value according to the fitted power generation flow rate relationship model and optimizing the fixed parameters of the power generation flow rate relationship model according to various errors of the power generation flow rate test value includes: Substituting the coefficient candidate value and the power index candidate value into the calculation formula of the electric power-flow relationship model to calculate the power generation flow test value; Counting various errors between the power generation flow test value and the actual power generation flow; Eliminate the coefficient alternative values ​​and power index alternative values ​​that fail the error test; Find a value with better accuracy from the coefficient candidate values ​​and power index candidate values ​​that have passed the error test.

7. A flow detection method based on electric power index method according to claim 6, characterized in that: The various errors include at least systematic errors and / or random uncertainties.

8. A flow detection system based on electric power index method, characterized in that: include: An acquisition module, used to acquire the actual power generation of the generator; The flow calculation module is used to input the measured power generation power into the power-flow relationship model based on the power index method to obtain the power generation flow.

9. A flow detection system based on electric power index method according to claim 8, characterized in that: It also includes a model building module for building an electric power-flow relationship model based on the power index method; the model building module includes a building and fitting submodule and an optimization submodule, wherein: The construction and fitting submodule is used to establish an electric power-flow relationship model based on the power index method, and to fit the fixed parameters of the electric power-flow relationship model according to the measured power generation flow and the measured power generation power; The optimization submodule is used to calculate the power generation flow test value according to the fitted power generation flow test value, and optimize the fixed parameters of the power generation flow relationship model according to various errors of the power generation flow test value.

10. An electronic device, characterized in that: It includes a memory and a processor, and the processor is used to implement the steps of the flow detection method based on the electric power index method as described in any one of claims 1 to 7 when executing the computer management program stored in the memory.

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