Integrated control method for flood discharge gate of hydropower station

Abstract

The invention discloses an integrated control method for a flood discharge gate of a hydropower station, relates to the technical field of water conservancy systems, and solves the technical problem that the opening degree of the gate cannot be adjusted according to the corresponding power generation efficiency, so that energy conversion of water resources is wasted in the flood discharge process. Whether corresponding gate opening work needs to be carried out or not is judged by comparing the current water level with the standard water level, water level early warning is carried out on the whole hydropower station through water level monitoring in the cycle time when gate opening is not needed, the overall safety is improved, and the water level early warning is carried out on the whole hydropower station according to the condition that gate opening is needed. The corresponding gate opening degree is calculated in combination with factors in multiple aspects, the corresponding power generation efficiency is calculated according to the gate opening degree, the power generation efficiency is analyzed and judged, comprehensive adjustment is further carried out according to historical data for unreasonable conditions, and the power generation efficiency is improved. The purpose of reasonable power generation can be achieved by reasonably utilizing water energy generated in the flood discharge process while flood discharge is conducted, and the purpose of reasonable utilization of resources is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy systems, and in particular to an integrated control method for flood discharge gates of a hydropower station. Background Art

[0002] For low-head run-of-river hydropower stations, the power stations undertake two tasks: flood control and power generation. Due to the limited regulating reservoir capacity, when the upstream water is large, how to scientifically and reasonably adjust the gate opening according to the inflow flow and the power generation scheduling curve, make full use of water resources, and generate the greatest power generation benefits while ensuring the safety of the dam is a big test for the reservoir dispatching duty officer.

[0003] According to Chinese patent application number CN202110771004.X, a method and system for integrated control of flood discharge gates of a hydropower station is disclosed, the method comprising the steps of: using a binary interpolation method to calculate the outflow flow of the dam and the change in storage capacity per unit time; calculating the incremental inflow per unit time; calculating the outflow flow of the dam discharge; using the interpolation method to calculate the unit efficiency and the outflow flow of the unit power generation; determining the current actual inflow flow; calculating the gate opening and sending the opening value to the gate control module to automatically adjust the gate opening.

[0004] The above patent realizes real-time communication of data between the reservoir dispatching system and the power station computer monitoring system through the PCC controller. The data such as unit load, water level, gate opening, etc. are directly collected and integrated into the same controller through the communication system or sensors. The PCC controller itself does not have a Windows operating system, and has very high network security, which fully meets the requirements of secondary power security. There is no need to deploy network security equipment such as firewalls separately, saving system investment. However, when regulating the gate, the above patent controls the gate opening through unilateral analysis of the incoming volume. Although this method can achieve the purpose of overall regulation, the hydropower station can not only achieve the purpose of flood discharge, but also achieve the purpose of power generation. If there is an unreasonable gate opening, it will affect the overall power generation, further causing waste of water resources and energy during the flood discharge process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an integrated control method for flood discharge gates of a hydropower station, which solves the problem that the gate opening cannot be adjusted according to the corresponding power generation efficiency, resulting in waste of water resource energy conversion during the flood discharge process.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for integrated control of flood discharge gates of a hydropower station, comprising the following steps:

[0007] Step 1: Obtain the current water level of the hydropower station and the water level standard, and compare the current water level with the water level standard to generate comparison information, and the comparison information includes a control signal and a signal that does not require control;

[0008] Step 2: Analyze the generated signal that does not require regulation, and generate an early warning signal or a normal monitoring signal by monitoring the change of the current water level within a time period;

[0009] Step 3: Analyze the generated control signal, calculate the water level difference by taking the difference between the current water level and the water level standard, calculate the gate opening according to the water level difference, and generate the gate opening information at the same time;

[0010] Step 4: Analyze the gate opening information obtained, and judge whether the gate opening is reasonable by analyzing the power generation efficiency corresponding to the hydropower station and generate a judgment result, and the judgment result includes a reasonable opening result and an unreasonable opening result;

[0011] Step 5: Analyze the unreasonable opening results generated, analyze them in combination with the power generation efficiency in historical data, adjust the gate opening in combination with the current water level, and generate adjustment information.

[0012] As a further solution of the present invention: the specific method of generating the comparison information in step 1 is:

[0013] Get the current water level and the water level standard at the same time, then compare the current water level with the water level standard, and the comparison here is by comparing the water level heights. If the current water level is greater than the water level standard, a control signal is generated. Otherwise, if the current water level is less than the water level standard, a signal is generated that does not require control.

[0014] As a further solution of the present invention: the specific method of analyzing the signal that does not require regulation in step 2 is:

[0015] Taking time t as a period, monitor the current water level within time period t, and obtain the current water level corresponding to n time periods t, recorded as Ln, where n = 1, 2, ..., m, where m represents the number of time periods, and then establish a relationship diagram between time period n and current water level Ln;

[0016] The change of the current water level is judged according to the relationship diagram. If the current water level is increasing, an increasing change signal is generated. Conversely, if the current water level is decreasing, a normal monitoring signal is generated, and the generated increasing change signal is analyzed at the same time.

[0017] As a further solution of the present invention: the specific method of analyzing the increase change signal in step 2 is:

[0018] Determine whether there is a sudden change in the current water level increase value. If there is no sudden change in the increase value, a normal monitoring signal is generated. Otherwise, if there is a sudden change in the increase value, the current water level value corresponding to the sudden change is further obtained and recorded as the abnormally changed water level. At the same time, the abnormally changed water level is compared with the warning value. When the abnormally changed water level is greater than the warning value, a warning signal is generated. Otherwise, when the abnormally changed water level is less than the warning value, a normal monitoring signal is generated.

[0019] As a further solution of the present invention: the specific method of generating the gate opening information in step 3 is:

[0020] The current water level is obtained and recorded as Ls, and the water level standard is obtained and recorded as Lz. Then the minimum flow rate for power generation is obtained and recorded as V1, and the corresponding gate opening e is calculated according to the formula. The specific calculation formula is: Among them, H0 is the upstream water depth, and the upstream water depth here has the same meaning as the current water level Ls, B is the net width of the gate, ε is the contraction coefficient, μ is the flow coefficient, A represents the flow area, and the flow area refers to the effective area through which the water flows after the gate is opened. At the same time, the corresponding gate opening information is generated.

[0021] As a further solution of the present invention: the specific method of analyzing the gate opening information in step 4 to generate the judgment result is:

[0022] The gate opening is adjusted according to the gate opening information, and the current power generation efficiency is calculated according to the adjusted gate opening, and the current power generation efficiency is compared with the standard power generation efficiency. If the current power generation efficiency is greater than the standard power generation efficiency, a reasonable opening result is generated. If the current power generation efficiency is less than the standard power generation efficiency, an unreasonable opening result is generated.

[0023] As a further solution of the present invention: the specific method of analyzing the unreasonable opening result in step 5 is:

[0024] Obtain historical data, and obtain the power generation efficiency in the historical data, record it as o, and o=1, 2, ..., p, and p represents the number corresponding to the power generation efficiency. At the same time, obtain the gate opening corresponding to the power generation efficiency o, record it as Wo, then filter the historical data greater than the current power generation efficiency and record it as the record to be analyzed, and obtain the water level value in the record to be analyzed, record it as the water level to be analyzed, and calculate the difference between the water level to be analyzed and the current water level, and select the record to be analyzed with the smallest water level difference as the standard;

[0025] Then, the gate opening corresponding to the standard record to be analyzed is obtained and recorded as the standard opening, and the difference between the standard opening and the gate opening e is calculated and recorded as the opening difference. At the same time, the opening difference is analyzed and judged, and the calculated opening difference is compared with the threshold. If the difference is greater than the threshold, a secondary adjustment signal is generated. If the difference is less than the threshold, an adjustment information is generated.

[0026] As a further solution of the present invention: the specific method of analyzing the secondary adjustment signal in step 5 is:

[0027] The water level difference is selected from small to large for analysis, and the corresponding opening difference is calculated based on the selected water level difference. At the same time, the opening difference is compared with the threshold. If the opening difference is greater than the threshold, the water level difference is continued to be analyzed until the opening difference meets the threshold and the adjustment information is generated. If the opening difference is less than the threshold, the adjustment information is generated.

[0028] The present invention provides an integrated control method for flood discharge gates of a hydropower station. Compared with the prior art, it has the following beneficial effects:

[0029] The present invention determines whether corresponding gate opening is required by comparing the current water level with the standard water level. If gate opening is not required, water level warning is performed on the entire hydropower station through periodic water level monitoring to improve overall safety. Secondly, if gate opening is required, the corresponding gate opening is calculated by combining various factors. At the same time, the corresponding power generation efficiency is calculated based on the gate opening, and the power generation efficiency is analyzed and determined. For unreasonable situations, comprehensive adjustments are further made based on historical data. While ensuring flood discharge, the water energy generated during the flood discharge process can be reasonably utilized to achieve the purpose of reasonable power generation, thereby achieving the purpose of reasonable utilization of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a method diagram of the present invention;

[0031] Figure 2 It is the flood discharge discrimination table of the present invention. DETAILED DESCRIPTION

[0032] 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.

[0033] See also Figure 1 and Figure 2The present application provides a method for integrated control of flood discharge gates in a hydropower station, the method specifically comprising the following steps:

[0034] Step 1: Obtain the current water level of the hydropower station and the water level standard, and compare the current water level with the water level standard to generate comparison information, and the comparison information includes a control signal and a signal that does not require control. The specific method of generating the comparison information is:

[0035] The current water level is obtained, and the current water level here represents the overall water storage level of the hydropower station. At the same time, the water level standard is obtained, and the water level standard represents the highest water storage level corresponding to the hydropower station. Then the current water level is compared with the water level standard, and the comparison here is through comparing the water level height. If the current water level is greater than the water level standard, it means that the overall water storage height of the hydropower station needs to be adjusted, and a control signal is generated. On the contrary, if the current water level is less than the water level standard, it means that the overall water storage height of the hydropower station does not need to be adjusted, and a signal that no control is required is generated.

[0036] For example, suppose the water level standard of a hydropower station is 100 meters, and the current real-time water level obtained by the monitoring equipment is 102 meters. Through comparative analysis, it is found that the current water level has exceeded the standard value of the highest water storage level. At this time, the system will automatically generate a control signal to prompt the operator or the automatic adjustment system to take measures, such as opening the gate to release water, to lower the water level to a safe range. On the contrary, if the current water level is 98 meters, which is lower than the water level standard, the system will generate a signal that does not require control, indicating that the current water level is in a safe and controllable state, and generate a signal that does not require control.

[0037] Step 2: Analyze the generated signal that does not require regulation, and generate an early warning signal or a normal monitoring signal by monitoring the change of the current water level within a time period. The specific change monitoring method is:

[0038] Taking time t as a cycle, the current water level within the time period t is monitored, and the current water level corresponding to n time periods t is obtained and recorded as Ln, where n=1, 2, ..., m, where m represents the number of time periods, and the specific value of the time period t is set by the operator, and then a relationship diagram between the time period n and the current water level Ln is established;

[0039] According to the relationship diagram, the change of the current water level is judged. If the current water level is increasing, an increasing change signal is generated. Conversely, if the current water level is decreasing, a normal monitoring signal is generated, and the generated increasing change signal is analyzed at the same time;

[0040] The specific analysis method for the increasing change signal is: to judge the current water level increase value, and to judge whether there is a sudden change in the increase value. If there is no sudden change in the increase value, a normal monitoring signal is generated. Otherwise, if there is a sudden change in the increase value, the current water level value corresponding to the sudden change is further obtained and recorded as the abnormal change water level. At the same time, the abnormal change water level is compared with the warning value, and the specific value of the warning value here is set by the operator. The warning value is set by the operator according to historical data and safety standards. When the abnormal change water level is greater than the warning value, a warning signal is generated. Otherwise, when the abnormal change water level is less than the warning value, a normal monitoring signal is generated.

[0041] For example, suppose the operator sets the warning value to 10 meters based on historical data analysis. During a monitoring, the system detects that the water level rises sharply from 95 meters to 103 meters, and this increase clearly shows a sudden change characteristic. Since this abnormal change of the water level of 103 meters exceeds the warning value of 10 meters, the system immediately generates a warning signal.

[0042] Step 3: Analyze the generated control signal, calculate the water level difference by taking the difference between the current water level and the water level standard, calculate the gate opening according to the water level difference, and generate the gate opening information at the same time. The specific method of generating the gate opening information is as follows:

[0043] The current water level is obtained and recorded as Ls, and the water level standard is obtained and recorded as Lz. Then the minimum flow rate for power generation is obtained and recorded as V1. The minimum flow rate V1 here means that when the flood is discharged according to the current flow rate, it can drive the work of the hydropower station generator, and the corresponding gate opening e is calculated according to the formula. The specific calculation formula is: Where H0 is the upstream water depth, and the upstream water depth here has the same meaning as the current water level Ls, B is the net width of the gate, ε is the contraction coefficient, μ is the flow coefficient, and A is the flow area. The flow area refers to the effective area through which water flows after the gate is opened, and the flow area is related to the opening of the gate. The gate opening e is calculated according to the above formula, and the corresponding gate opening information is generated at the same time.

[0044] The specific process of calculating the gate opening e is to transform the two formulas into At the same time, the flow area is determined by the gate net width and the gate opening, so A=e×B. The deformed formula is further substituted into the above formula to calculate the gate opening e.

[0045] Specific, and as attached Figure 2 The discrimination table shown in the figure is shown in the figure, and the flow coefficient is calculated as follows: hour,

[0046] When cosα=013~017,

[0047] Step 4: Analyze the gate opening information obtained, and judge whether the gate opening is reasonable by analyzing the power generation efficiency corresponding to the hydropower station and generate a judgment result, and the judgment result includes a reasonable opening result and an unreasonable opening result, and the specific method of generating the judgment result is:

[0048] The gate opening is adjusted according to the gate opening information, and the current power generation efficiency is calculated according to the adjusted gate opening. The power generation efficiency here is calculated based on the gate opening, and the current power generation efficiency is compared with the standard power generation efficiency. The specific value of the standard power generation efficiency here is set by the operator, and the standard power generation efficiency is set according to the actual situation. The standard power generation efficiency is set according to the actual operation of the power station and historical data to reflect the ideal power generation state. If the current power generation efficiency is greater than the standard power generation efficiency, it means that the current gate opening can meet the power generation demand and generate a reasonable opening result. If the current power generation efficiency is less than the standard power generation efficiency, it means that the current gate opening cannot meet the power generation demand and generates an unreasonable opening result.

[0049] For example, suppose the operator sets the standard power generation efficiency to 80% based on the design and empirical data of the hydropower station. After one adjustment, the current power generation efficiency calculated based on the new opening of the gate is 85%. Since this value exceeds the standard power generation efficiency of 80%, the system determines that the current gate opening is reasonable and can meet the power generation demand, so it generates a reasonable opening result. This result will be fed back to the operator for confirmation or further optimization. On the contrary, if the calculated current power generation efficiency is only 70%, it is lower than the standard value, and the system will prompt that the opening is unreasonable and the gate opening needs to be adjusted to achieve higher power generation efficiency.

[0050] Step 5: Analyze the unreasonable opening results generated, analyze them in combination with the power generation efficiency in historical data, adjust the gate opening in combination with the current water level, and generate adjustment information. The specific method of generating the adjustment information is as follows:

[0051] Obtain historical data, and obtain the power generation efficiency in the historical data, record it as o, and o=1, 2, ..., p, and p represents the number corresponding to the power generation efficiency, and the number here only represents the number of the power generation efficiency, and at the same time obtain the gate opening corresponding to the power generation efficiency o, record it as Wo, then filter the historical data greater than the current power generation efficiency and record it as the record to be analyzed, and obtain the water level value in the record to be analyzed, record it as the water level to be analyzed, and at the same time calculate the difference between the water level to be analyzed and the current water level, and select the record to be analyzed with the smallest water level difference as the standard;

[0052] Then, the gate opening corresponding to the standard record to be analyzed is obtained and recorded as the standard opening, and the difference between the standard opening and the gate opening e is calculated and recorded as the opening difference. At the same time, the opening difference is analyzed and judged, and the calculated opening difference is compared with the threshold value. The specific value of the threshold value here is set by the operator. At the same time, the determination of the threshold value is determined and analyzed based on historical data, and a variety of factors in the actual situation are analyzed comprehensively, such as impact pressure, flood discharge time, etc. If the difference is greater than the threshold, it means that the standard opening does not meet the actual situation, and a secondary adjustment signal is generated. If the difference is less than the threshold, it means that the standard opening meets the actual situation, and an adjustment information is generated;

[0053] For the generated secondary adjustment signal, the water level difference is selected from small to large for analysis, and the corresponding opening difference is calculated based on the selected water level difference. At the same time, the opening difference is compared with the threshold. If the opening difference is greater than the threshold, the water level difference continues to be analyzed until the opening difference meets the threshold and the adjustment information is generated. If the opening difference is less than the threshold, the adjustment information is generated.

[0054] For example, suppose the operator sets the threshold to 5 cm. When analyzing historical data, the system finds that the historical power generation efficiency at a certain moment is 85%, which is higher than the current power generation efficiency of 80%, and the gate opening at that moment is 5 meters. The current gate opening is 4.8 meters, and the opening difference is 20 cm, which is greater than the set threshold of 5 cm. Therefore, the system determines that adjustment is needed and generates a secondary adjustment signal. The system continues to analyze other records with smaller water level differences until it finds a record with an opening difference of 3 cm, which is less than the threshold. At this time, the system will generate adjustment information, prompting the operator to adjust the gate from the current opening to the standard opening to improve efficiency and adaptability.

[0055] Some of the data in the above formulas are dimensionless and numerically calculated. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0056] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. 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 method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A method for integrated control of flood discharge gates of a hydropower station, characterized in that: The following steps are involved: Step 1: Obtain the current water level of the hydropower station and the water level standard, and compare the current water level with the water level standard to generate comparison information, and the comparison information includes a control signal and a signal that does not require control; Step 2: Analyze the generated signal that does not require regulation, and generate an early warning signal or a normal monitoring signal by monitoring the change of the current water level within a time period; Step 3: Analyze the generated control signal, calculate the water level difference by taking the difference between the current water level and the water level standard, calculate the gate opening according to the water level difference, and generate the gate opening information at the same time; Step 4: Analyze the gate opening information obtained, and judge whether the gate opening is reasonable by analyzing the power generation efficiency corresponding to the hydropower station and generate a judgment result, and the judgment result includes a reasonable opening result and an unreasonable opening result; Step 5: Analyze the unreasonable opening results generated, analyze them in combination with the power generation efficiency in historical data, adjust the gate opening in combination with the current water level, and generate adjustment information.

2. A method for integrated control of flood discharge gates of a hydropower station according to claim 1, characterized in that: The specific method of generating the comparison information in step 1 is: Get the current water level and the water level standard at the same time, then compare the current water level with the water level standard, and the comparison here is by comparing the water level heights. If the current water level is greater than the water level standard, a control signal is generated. Otherwise, if the current water level is less than the water level standard, a signal is generated that does not require control.

3. A method for integrated control of flood discharge gates of a hydropower station according to claim 1, characterized in that: The specific method of analyzing the generated signal that does not require regulation in step 2 is: Taking time t as a period, monitor the current water level within time period t, and obtain the current water level corresponding to n time periods t, recorded as Ln, where n = 1, 2, ..., m, where m represents the number of time periods, and then establish a relationship diagram between time period n and current water level Ln; The change of the current water level is judged according to the relationship diagram. If the current water level is increasing, an increasing change signal is generated. Conversely, if the current water level is decreasing, a normal monitoring signal is generated, and the generated increasing change signal is analyzed at the same time.

4. A method for integrated control of flood discharge gates of a hydropower station according to claim 3, characterized in that: The specific method of analyzing the increase change signal in step 2 is: Determine whether there is a sudden change in the current water level increase value. If there is no sudden change in the increase value, a normal monitoring signal is generated. Otherwise, if there is a sudden change in the increase value, the current water level value corresponding to the sudden change is further obtained and recorded as the abnormally changed water level. At the same time, the abnormally changed water level is compared with the warning value. When the abnormally changed water level is greater than the warning value, a warning signal is generated. Otherwise, when the abnormally changed water level is less than the warning value, a normal monitoring signal is generated.

5. The integrated control method for flood discharge gates of a hydropower station according to claim 1, characterized in that: The specific method of analyzing the generated control signal is: The current water level is obtained and recorded as Ls, and the water level standard is obtained and recorded as Lz. Then the minimum flow rate for power generation is obtained and recorded as V1, and the corresponding gate opening e is calculated according to the formula. The specific calculation formula is: Among them, H0 is the upstream water depth, B is the net width of the gate, ε is the contraction coefficient, μ is the flow coefficient, and A represents the flow area. The flow area refers to the effective area through which water flows after the gate is opened. At the same time, the corresponding gate opening information is generated.

6. A method for integrated control of flood discharge gates of a hydropower station according to claim 1, characterized in that: The specific method of analyzing the gate opening information and generating the judgment result in step 4 is: The gate opening is adjusted according to the gate opening information, and the current power generation efficiency is calculated according to the adjusted gate opening, and the current power generation efficiency is compared with the standard power generation efficiency. If the current power generation efficiency is greater than the standard power generation efficiency, a reasonable opening result is generated. If the current power generation efficiency is less than the standard power generation efficiency, an unreasonable opening result is generated.

7. A method for integrated control of flood discharge gates of a hydropower station according to claim 1, characterized in that: The specific method for analyzing the unreasonable opening results in step 5 is: Obtain historical data, and obtain the power generation efficiency in the historical data, record it as o, and o=1, 2, ..., p, and p represents the number corresponding to the power generation efficiency. At the same time, obtain the gate opening corresponding to the power generation efficiency o, record it as Wo, then filter the historical data greater than the current power generation efficiency and record it as the record to be analyzed, and obtain the water level value in the record to be analyzed, record it as the water level to be analyzed, and calculate the difference between the water level to be analyzed and the current water level, and select the record to be analyzed with the smallest water level difference as the standard; Then, the gate opening corresponding to the standard record to be analyzed is obtained and recorded as the standard opening, and the difference between the standard opening and the gate opening e is calculated and recorded as the opening difference. At the same time, the opening difference is analyzed and judged, and the calculated opening difference is compared with the threshold. If the difference is greater than the threshold, a secondary adjustment signal is generated. If the difference is less than the threshold, an adjustment information is generated.

8. A method for integrated control of flood discharge gates of a hydropower station according to claim 7, characterized in that: The specific method of analyzing the secondary adjustment signal in step 5 is: The water level difference is selected from small to large for analysis, and the corresponding opening difference is calculated based on the selected water level difference. At the same time, the opening difference is compared with the threshold. If the opening difference is greater than the threshold, the water level difference is continued to be analyzed until the opening difference meets the threshold and the adjustment information is generated. If the opening difference is less than the threshold, the adjustment information is generated.

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