A method and system for rating flow characteristic curve of hydroelectric generating set

Abstract

The application provides a method and system for calibrating the flow characteristic curve of a generator set of a hydropower station. The method comprises the following steps: obtaining the power generation head of each generator set in a cascade hydropower station, the power generation load of each generator set in the cascade hydropower station, and the initial flow characteristic curve of each generator set, and determining the initial power generation flow of each generator set based on the initial flow characteristic curve; grouping the initial power generation flow of each generator set according to the power generation head of each generator set in the cascade hydropower station and the power generation load of each generator set in the cascade hydropower station, and obtaining the power generation flow under each flow group; determining the adjustment range of the power generation flow under each flow group, and discretely processing the adjustment range of the power generation flow under each flow group to obtain the power generation flow change value corresponding to the power generation flow under each flow group, thereby forming the power generation flow change value sequence under each flow group; and calibrating the initial power generation flow of each generator set according to the power generation flow change value sequence under each flow group, thereby obtaining the calibrated flow characteristic curve of the generator set of the cascade hydropower station. The technical scheme provided by the application can efficiently and accurately calibrate the flow characteristic curve of the generator set of the hydropower station.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydropower production operation, and in particular to a method and system for calibrating a flow characteristic curve of a generator unit of a hydropower station. BACKGROUND

[0002] The flow characteristic curve (N-H-Q curve) of a generator unit of a hydropower station is a cluster of three-dimensional curves composed of unit output, power generation water head, and power generation reference flow. Generally, the curve is measured and determined through model test or prototype test during the design and manufacturing process of the unit, and is often used to calculate the power generation flow of the hydropower station in water management calculation. Analysis of the flow characteristic curves of more than 10 hydropower station units shows that the calculation flow error is about 3% to 5%. This part of error will affect the flow of production, life, and ecology of downstream production in cascade hydropower stations, especially after the formation of cascade, the calculation error of power generation flow leads to the problem of water imbalance between upstream and downstream cascades, that is, the inflow of a certain reservoir is smaller than the outflow of the upstream reservoir. These problems will also affect the water resource allocation and optimal scheduling of cascade hydropower, and the flow characteristic curve of the unit needs to be corrected and calibrated.

[0003] In the prior art, the power generation reference flow of the unit can be measured in real time by the ultrasonic flowmeter arranged on the water intake pipeline of the unit, or the total outflow of the hydropower station can be measured by the hydrological station downstream of the power station. The deviation of the flow characteristic curve is analyzed in combination with the unit load, power generation water head, and other factors, so as to calibrate the curve. However, the error of the ultrasonic flowmeter and the hydrological station is usually about 5%, which is comparable to the error of the curve, and it is difficult to achieve ideal calibration effect. Moreover, the existing technology can only focus on the power station itself, and it is difficult to overall correct the water balance problem after the calibration of the entire cascade curve, and the workload is large. The calculation error after calibration is still about 3%. SUMMARY

[0004] The present application provides a method and system for calibrating the flow characteristic curve of a generator unit of a hydropower station to at least solve the technical problem of poor calibration accuracy of the power generation flow curve of a cascade hydropower station.

[0005] The first aspect of the present application provides a method for calibrating the flow characteristic curve of a generator unit of a hydropower station, which comprises:

[0006] obtaining each power generation water head in the cascade hydropower station, the power generation load of each unit in the cascade hydropower station, and the initial flow characteristic curve of each unit, and determining the initial power generation flow of each unit based on the initial flow characteristic curve;

[0007] grouping the initial power generation flow of each unit according to each power generation water head in the cascade hydropower station and the power generation load of each unit in the cascade hydropower station to obtain the power generation flow under each flow grouping;

[0008] determining an adjustment range of the power generation flow under each flow group, and discretely processing the adjustment range of the power generation flow under each flow group to obtain each power generation flow change value corresponding to the power generation flow under each flow group, and forming a power generation flow change value sequence under each flow group;

[0009] calibrating the initial power generation flow of each unit according to the power generation flow change value sequence under each flow group to obtain a calibrated power generation unit flow characteristic curve of the cascade hydropower station.

[0010] Preferably, the initial power generation flow of each unit is grouped according to the power generation head in the cascade hydropower station and the power generation load of each unit in the cascade hydropower station to obtain the power generation flow under each flow group, including:

[0011] determining the maximum value and the minimum value of the power generation head in the cascade hydropower station based on the power generation head in the cascade hydropower station;

[0012] grouping the power generation head in the cascade hydropower station according to a preset first range threshold to obtain the power generation head under each head group;

[0013] determining the maximum value and the minimum value of the power generation load in the cascade hydropower station based on the power generation load of each unit in the cascade hydropower station;

[0014] grouping the power generation load of each unit in the cascade hydropower station according to a preset second range threshold to obtain the power generation load under each load group;

[0015] combining the power generation head under each head group with the power generation load under each load group, and determining the power generation flow under each combination, and taking the power generation flow under each combination as the power generation flow under each flow group.

[0016] Further, the determination of the adjustment range of the power generation flow under each flow group includes:

[0017] determining the minimum value and the minimum value of the power generation flow adjustment range of the kth flow group of the i-level hydropower station;

[0018] constructing the power generation flow adjustment range of the kth flow group of the i-level hydropower station based on the minimum value and the minimum value of the power generation flow adjustment range of the kth flow group of the i-level hydropower station;

[0019] wherein, , is the total number of the cascade hydropower stations, is the total number of flow groups in one hydropower station.

[0020] Furthermore, the formula for calculating the minimum adjustment range of the power generation flow under the k-th flow group of the i-th hydropower station is as follows:

[0021]

[0022] The formula for calculating the maximum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is as follows:

[0023]

[0024] In the formula, This represents the minimum adjustment range of the power generation flow rate under the k-th flow group of the i-th hydropower station. Let be the average power generation load of the k-th flow group of the i-th hydropower station. Let be the average head for generating electricity in the k-th flow group of the i-th hydropower station. Let be the average power generation flow of the k-th flow group of the i-th hydropower station. This is the upper limit of the overall output coefficient. This represents the maximum adjustment range of power generation flow under the k-th flow group of the i-th hydropower station. This represents the lower limit of the overall output coefficient.

[0025] Furthermore, the calibration of the initial power generation flow of each unit based on the power generation flow change value sequence under each flow group, to obtain the calibrated generator unit flow characteristic curves of the cascade hydropower station, includes:

[0026] Step F1: Obtain the power generation flow of the upstream power station or hydrological station of each level of the cascade hydropower station and the inflow of each level of hydropower station within the preset time period. Then, based on the power generation flow of the upstream power station or hydrological station of each level of hydropower station and the inflow of each level of hydropower station within the preset time period, determine the average interval flow of each level of hydropower station within the preset time period using the rolling average or moving average method.

[0027] Step F2: Summarize the total number of time periods when the average interval flow of all cascade hydropower stations is negative, and use the total number of time periods as the initial total number of negative time periods for the cascade hydropower stations;

[0028] Step F3: Initialize parameters i, k, r, d, etc., setting i=1, k=1, r=1, d=1;

[0029] Step F4: Use the rth change value in the sequence of power generation flow change values ​​of the kth flow group in the i-th hydropower station to adjust the power generation flow of the kth flow group after the (r-1)th calibration, so as to obtain the rth power generation flow within the kth flow group in the i-th hydropower station.

[0030] Step F5: Based on the r-th power generation flow in each flow group of the i-th hydropower station, determine the total number of negative periods for the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station;

[0031] Step F6: Determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the minimum total number of negative periods of the cascade hydropower stations. If so, take the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station as the minimum total number of negative periods of the cascade hydropower stations, and take the r-th power generation flow in the k-th flow group of the i-th hydropower station as the power generation flow of the k-th flow group of the i-th hydropower station after the r-th calibration. Wherein, when r=1, determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the initial total number of negative periods of the cascade hydropower stations.

[0032] Step F7: Determine if r is equal to R. If yes, proceed to step F8; otherwise, set r = r + 1 and return to step F4, where R is the preset first threshold.

[0033] Step F8: Determine if k equals K. If yes, proceed to step F9; otherwise, set k = k + 1, r = 1, and return to step F4.

[0034] Step F9: Determine if i equals I. If yes, proceed to step F10; otherwise, set i = i + 1, r = 1, k = 1, and return to step F4, where I is the third threshold.

[0035] Step F10: Determine whether d is equal to D. If yes, construct the generator flow characteristic curve of the i-th hydropower station based on the calibration power generation flow of each flow group of the i-th hydropower station obtained in the D-th iteration. Otherwise, let d = d + 1 and return to step F3, where D is the second threshold.

[0036] A second aspect of this application provides a calibration system for the flow characteristic curve of a hydropower station generator unit, comprising:

[0037] The acquisition module is used to acquire the generating head of each unit in the cascade hydropower station, the generating load of each unit in the cascade hydropower station, and the initial flow characteristic curve of each unit, and to determine the initial generating flow of each unit based on the initial flow characteristic curve.

[0038] The grouping module is used to group the initial power generation flow of each unit according to the power generation head and power generation load of each unit in the cascade hydropower station, and to obtain the power generation flow under each flow group.

[0039] The discrete module is used to determine the adjustment range of the power generation flow under each flow group, and to discretize the adjustment range of the power generation flow under each flow group to obtain the power generation flow change value corresponding to the power generation flow under each flow group, thus forming a sequence of power generation flow change values ​​under each flow group.

[0040] The calibration module is used to calibrate the initial power generation flow of each unit based on the power generation flow change value sequence under each flow group, and obtain the calibrated generator unit flow characteristic curve of the cascade hydropower station.

[0041] Preferably, the grouping module is further used for:

[0042] The maximum and minimum power generation heads of the cascade hydropower stations are determined based on the power generation heads of each power generation head in the cascade hydropower stations.

[0043] The power generation heads of the cascade hydropower stations are grouped according to a preset first range threshold to obtain the power generation heads of each head group.

[0044] The maximum and minimum power generation loads within the cascade hydropower stations are determined based on the power generation loads of each generating unit within the cascade hydropower stations.

[0045] The power generation load of each unit in the cascade hydropower station is grouped according to the preset second range threshold to obtain the power generation load under each load group.

[0046] The power generation head under each head group is combined with the power generation load under each load group, and the power generation flow rate under each combination is determined. The power generation flow rate under each combination is used as the power generation flow rate under each flow rate group.

[0047] Furthermore, the discrete module is also used for:

[0048] Determine the minimum value and minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station;

[0049] Based on the minimum value and the minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station, the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is constructed.

[0050] in, , This represents the total number of cascade hydropower stations. This represents the total number of flow groups within a hydroelectric power station.

[0051] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the method described in the first aspect embodiment.

[0052] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the method described in the first aspect.

[0053] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0054] This application proposes a method and system for calibrating the flow characteristic curves of hydropower station generator units. The method includes: acquiring the generating heads, generating loads of each unit in a cascade hydropower station, and the initial flow characteristic curves of each unit; determining the initial generating flow of each unit based on the initial flow characteristic curves; grouping the initial generating flow of each unit according to the generating heads and generating loads of each unit in the cascade hydropower station to obtain the generating flow under each flow group; determining the adjustment range of the generating flow under each flow group, and discretizing the adjustment range of the generating flow under each flow group to obtain the change values ​​of each generating flow corresponding to the generating flow under each flow group, forming a sequence of generating flow change values ​​under each flow group; calibrating the initial generating flow of each unit according to the sequence of generating flow change values ​​under each flow group to obtain the calibrated flow characteristic curves of the generator units in the cascade hydropower station. The technical solution proposed in this application can efficiently and accurately calibrate the flow characteristic curves of hydropower station generator units.

[0055] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0056] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0057] Figure 1 This is a flowchart of a calibration method for the flow characteristic curve of a hydropower station generator set according to an embodiment of this application;

[0058] Figure 2 This is a schematic diagram of a cascade hydropower station, a river hydrological station, and a cross-sectional section according to an embodiment of this application;

[0059] Figure 3 This is a schematic diagram of the flow characteristic curve of a power plant unit according to an embodiment of this application;

[0060] Figure 4 Here is a detailed flowchart of a calibration method for the flow characteristic curve of a hydropower station generator set according to an embodiment of this application;

[0061] Figure 5 This is a structural diagram of a calibration system for the flow characteristic curve of a hydropower station generator set according to an embodiment of this application. Detailed Implementation

[0062] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0063] This application proposes a method and system for calibrating the flow characteristic curves of hydropower station generator units. The method includes: acquiring the generating heads, generating loads of each unit in a cascade hydropower station, and initial flow characteristic curves of each unit; determining the initial generating flow of each unit based on the initial flow characteristic curves; grouping the initial generating flow of each unit according to the generating heads and generating loads of each unit in the cascade hydropower station to obtain the generating flow under each flow group; determining the adjustment range of the generating flow under each flow group, and discretizing the adjustment range to obtain the change values ​​of each generating flow corresponding to the generating flow under each flow group, forming a sequence of generating flow change values ​​under each flow group; calibrating the initial generating flow of each unit according to the sequence of generating flow change values ​​under each flow group to obtain the calibrated flow characteristic curves of the generator units in the cascade hydropower station. The technical solution proposed in this application can efficiently and accurately calibrate the flow characteristic curves of hydropower station generator units.

[0064] The following description, with reference to the accompanying drawings, describes a calibration method and system for the flow characteristic curve of a hydropower station generator set according to an embodiment of this application.

[0065] Example 1

[0066] Figure 1 This is a flowchart illustrating a calibration method for the flow characteristic curve of a hydropower station generator unit according to an embodiment of this application, as shown below. Figure 1 As shown, the method includes:

[0067] Step 1: Obtain the generating head, generating load of each unit in the cascade hydropower station, and initial flow characteristic curve of each unit, and determine the initial generating flow of each unit based on the initial flow characteristic curve.

[0068] It should be noted that the power generation heads, power generation loads of each unit in the cascade hydropower stations, and initial flow characteristic curves of each unit are all data from periods when no flood discharge occurs.

[0069] In the embodiments disclosed herein, interpolation methods can be used to calculate the real-time or time-period single-unit power generation flow, i.e., the initial power generation flow of each unit.

[0070] Step 2: Based on the generating head and generating load of each unit in the cascade hydropower station, the initial generating flow of each unit is grouped to obtain the generating flow under each flow group.

[0071] In this embodiment of the disclosure, step 2 specifically includes:

[0072] 2.1: Determine the maximum and minimum generating heads of the cascade hydropower stations based on the generating heads of each station.

[0073] 2.2: The power generation heads of the cascade hydropower stations are grouped according to the preset first range threshold to obtain the power generation heads under each head group;

[0074] 2.3: Determine the maximum and minimum power generation loads within the cascade hydropower stations based on the power generation loads of each generating unit within the cascade hydropower stations;

[0075] 2.4: The power generation load of each unit in the cascade hydropower station is grouped according to the preset second range threshold to obtain the power generation load under each load group;

[0076] 2.5: Combine the power generation head under each head group with the power generation load under each load group, and determine the power generation flow rate under each combination. Use the power generation flow rate under each combination as the power generation flow rate under each flow group.

[0077] It should be noted that the maximum and minimum values ​​of the generating head and single-unit generating load of each power station are statistically analyzed, and the generating head and single-unit generating load are segmented into... , Combination of hydropower head and single-unit power generation load Divide the single-unit power generation flow into k groups to obtain a series Where k = a × b. The values ​​of a and b should be determined comprehensively based on factors such as the head range and load range of the power station;

[0078] 'a' represents the number of head segments, determined based on the maximum and minimum head range of the power station. For example, if the power station's head range is 70-110 meters, it can be divided into 20 groups (71, 73, 75... 109) with a range of 2 meters. Group 71 represents the data within the 70-72 meter head range, and group 73 represents the data within the 72-74 meter head range. Alternatively, if the power station's head range is 36-40 meters, it can be divided into 7 groups (36.5, 37, 37.5... 39.5) with a range of 1 meter.

[0079] 'b' represents the number of load segments, determined based on the maximum and minimum range of the actual generating load of a single unit at the power station. This is similar to head grouping. For example, if the load range of a single unit at the power station is 0-360MW, it can be divided into 18 groups (10, 30, 50... 350) with a range of 20MW each. The group 350 represents the data collected within the 340-360MW range.

[0080] k=a×b. For example, if the head is divided into 20 groups and the load is divided into 18 groups, the single unit flow rate will be divided into 360 groups. The flow rate series in the group with a head of 71 and a load of 350 is the time-period power generation flow rate under the operating condition of a head of 70-72 meters and a load of 340-360MW.

[0081] Step 3: Determine the adjustment range of the power generation flow under each flow group, and discretize the adjustment range of the power generation flow under each flow group to obtain the power generation flow change value corresponding to each flow group, thus forming a sequence of power generation flow change values ​​under each flow group.

[0082] In this embodiment of the disclosure, determining the adjustment range of the power generation flow under each flow group includes:

[0083] Determine the minimum value and minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station;

[0084] Based on the minimum value and the minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station, the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is constructed.

[0085] in, , This represents the total number of cascade hydropower stations. This represents the total number of flow groups within a hydroelectric power station.

[0086] Furthermore, the formula for calculating the minimum adjustment range of the power generation flow under the k-th flow group of the i-th hydropower station is as follows:

[0087]

[0088] The formula for calculating the maximum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is as follows:

[0089]

[0090] In the formula, This represents the minimum adjustment range of the power generation flow rate under the k-th flow group of the i-th hydropower station. Let be the average power generation load of the k-th flow group of the i-th hydropower station. Let be the average head for generating electricity in the k-th flow group of the i-th hydropower station. Let be the average power generation flow of the k-th flow group of the i-th hydropower station. This is the upper limit of the overall output coefficient. This represents the maximum adjustment range of power generation flow under the k-th flow group of the i-th hydropower station. This is the lower limit of the overall output coefficient, where, , The value range is generally between 8.0 and 9.0.

[0091] It should be noted that a series of power generation flow change values ​​are discretized based on the adjustment range of the power generation flow. In the formula, This represents the change in the m-th power generation flow rate under the k-th flow rate group of the i-th hydropower station.

[0092] Assuming the average value of the grouped flow series with a head of 71 and a load of 350 is 590, its adjustment range is calculated to be [-43, 26] according to the formula. The discrete change values ​​are generally arithmetic discrete and the number is relatively flexible. A range of 10-30 will be more balanced in terms of calculation efficiency and final effect.

[0093] Step 4: Based on the power generation flow change value sequence under each flow group, the initial power generation flow of each unit is calibrated to obtain the calibrated generator flow characteristic curve of the cascade hydropower station.

[0094] In this embodiment of the disclosure, step 4 specifically includes:

[0095] Step F1: Obtain the power generation flow of the upstream power station or hydrological station of each level of the cascade hydropower station and the inflow of each level of hydropower station within the preset time period. Then, based on the power generation flow of the upstream power station or hydrological station of each level of hydropower station and the inflow of each level of hydropower station within the preset time period, determine the average interval flow of each level of hydropower station within the preset time period using the rolling average or moving average method.

[0096] It should be noted that the interval flow of the i-th hydropower station in time period t is determined, and the average interval flow of the i-th hydropower station in each time period within a preset time period is determined based on the interval flow and by using the rolling average or moving average method.

[0097] Among them, the inflow of the i-level hydropower station within the preset time period t. : + ,in, , This represents the water storage flow rate of the i-th level power station during time period t; This represents the reservoir capacity of a Class i power station during time period t; This represents the power generation flow of the i-th class power plant during time period t;

[0098] When the upstream of the i-th level hydropower station is a power station, the formula is used. Determine the interval flow of the i-th level hydropower station during time period t. express to Flow rate of Class i power station during time period The t-zt time period represents the power generation flow of the i-1 level power station, which is the power generation flow of the upstream power station; zt represents the flow lag time from the upstream power station (hydrological station) to the current level power station (hydrological station).

[0099] When the upstream of the i-th level hydropower station is a hydrological station, the formula is used. Determine the interval flow of the i-th level hydropower station during time period t. This represents the hydrological station's power generation flow during the t-zt time period.

[0100] It should be noted that when calibrating the flow characteristic curve of the generator unit at a hydrological station, if the upstream of the hydrological station is a power station, the formula should be used. Determine the interval flow rate of the i-level hydrological station during time period t.

[0101] Step F2: Summarize the total number of time periods when the average interval flow of all cascade hydropower stations is negative, and use the total number of time periods as the initial total number of negative time periods for the cascade hydropower stations;

[0102] Step F3: Initialize parameters i, k, r, d, etc., setting i=1, k=1, r=1, d=1;

[0103] Step F4: Use the rth change value in the sequence of power generation flow change values ​​of the kth flow group in the i-th hydropower station to adjust the power generation flow of the kth flow group after the (r-1)th calibration, so as to obtain the rth power generation flow within the kth flow group in the i-th hydropower station.

[0104] Step F5: Based on the r-th power generation flow in each flow group of the i-th hydropower station, determine the total number of negative periods for the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station;

[0105] Step F6: Determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the minimum total number of negative periods of the cascade hydropower stations. If so, take the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station as the minimum total number of negative periods of the cascade hydropower stations, and take the r-th power generation flow in the k-th flow group of the i-th hydropower station as the power generation flow of the k-th flow group of the i-th hydropower station after the r-th calibration. Wherein, when r=1, determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the initial total number of negative periods of the cascade hydropower stations.

[0106] Step F7: Determine if r is equal to R. If yes, proceed to step F8; otherwise, set r = r + 1 and return to step F4. Here, R is the preset first threshold, which is the same as the number of change values ​​in the power generation flow change value sequence.

[0107] Step F8: Determine if k equals K. If yes, proceed to step F9; otherwise, set k = k + 1, r = 1, and return to step F4.

[0108] Step F9: Determine if i equals I. If yes, proceed to step F10; otherwise, set i = i + 1, r = 1, k = 1, and return to step F4, where I is the third threshold, i.e., the total number of cascade hydropower stations.

[0109] Step F10: Determine whether d is equal to D. If yes, construct the generator flow characteristic curve of the i-th hydropower station based on the calibration power generation flow of each flow group of the i-th hydropower station obtained in the D-th iteration. Otherwise, let d = d + 1 and return to step F3, where D is the second threshold.

[0110] It should be noted that: 1) The total number of time periods in which the average interval flow is negative among the average interval flow for each time period is calculated. and assign values ;

[0111] 2) Utilize All flows within the group are adjusted to obtain a new set of power generation flows. The new set of power generation flows is then grouped into flows, and the adjustment range of the power generation flows under each flow group is determined. Then, the adjustment range of the power generation flows under each flow group is discretized to obtain the power generation flow change value corresponding to each flow group, thus forming a sequence of power generation flow change values ​​under each flow group.

[0112] 3) Then determine the number of time periods where the interval flow corresponding to the new set of power generation flow is negative. ;

[0113] 4) Judgment If it is: assign a value Record the current group flow adjustment value and update the single unit power generation flow series. and traffic grouping series To participate in subsequent calculations, based on the next change value Perform group traffic adjustment; "No" then adjust based on the next change value. Adjust the traffic flow by group.

[0114] 5) Repeat steps 1)-4) above until all cascade hydropower stations, all grouped flow rates, and all adjustment values ​​are calculated, completing one iteration and waiting for the latest value. ;

[0115] 6) Repeat steps 1)-5) above for the specified number of iterations until... The flow rate is no longer reduced, thus obtaining the optimal power generation flow rate.

[0116] Based on this, the calibrated flow characteristic curve (NHQ curve) is redrawn, or a correction is made based on the original flow characteristic curve.

[0117] This embodiment takes the calibration of the flow characteristic curves of three cascade hydropower stations in a certain river basin as an example. Hydrological monitoring stations are set up upstream of the first-stage power station and between the second and third-stage power stations. Figure 2 As shown.

[0118] (1) Obtain the single-unit power generation load and power generation head of the three cascade power stations for five minutes over the past three years from the relevant system. After removing the time periods when the three cascade power stations discharge floodwater, calculate the corresponding single-unit power generation flow using the initial flow characteristic curve interpolation.

[0119] (2) Obtain water level and flow data of two hydrological monitoring stations every 10 minutes for the past three years.

[0120] (3) The maximum and minimum values ​​of the generating head and single-unit generating load of each power station are statistically analyzed, as shown in Table 1:

[0121] Table 1

[0122]

[0123] Based on the head and load ranges of the three hydropower stations, the power generation is divided into equally spaced segments. The first and second-level power stations are divided into 10 segments for head generation and 25 segments for load generation, while the third-level power station is divided into 20 segments for head generation and 25 segments for load generation. The single-unit power generation flow of each power station is further divided into... Group obtained series The power generation flow of the first-stage power station is divided into 250 groups;

[0124] The adjustment range for each group of power generation flow is calculated using the following formula to ensure that the flow adjustment is within a reasonable range:

[0125]

[0126] The flow grouping and adjustment range of the first-level power station are shown in Table 2 below:

[0127] Table 2

[0128]

[0129] For all flow groups, 20 adjustment values ​​are discretized according to the above adjustment range. For example, the flow adjustment range for the group with a head of 84m and a load of 250MW in the table above is -13.7 to 27.7. Within this range, 20 power generation flow change values ​​are discretized [-13.7, -11.5, -9.3, -7.2, -5.0, -2.8, -0.6, 1.6, 3.7, 5.9, 8.1, 10.3, 12.4, 14.6, 16.8, 19.0, 21.2, 23.3, 25.5, 27.7].

[0130] (4) Calculate the hourly water storage flow and power generation flow of each cascade hydropower station, estimate the inflow of the three power stations, and calculate the interval flow of the four intervals with a rolling length of 24 hours. The partial flow calculation results of the first-level power station are shown in Table 3 below:

[0131] Table 3

[0132]

[0133] (5) The number of time periods with negative flow in the four intervals is N_0=7607, and N_min=N_0=7607 is assigned. The statistical results of negative flow at each section are shown in Table 4 below:

[0134] Table 4

[0135]

[0136] (6) For the first group of the first-level power station, adjust all the flows in the group according to the 20 determined power generation flow change values ​​to obtain a new group of power generation flow processes, recalculate the inflow and interval flow, and obtain the number of time periods when the interval flow of each cascade is negative. ,judge If it is: assign a value Record the current group flow adjustment value and update the single unit power generation flow series. and traffic grouping series According to the next change value Perform group traffic adjustment; "No" then adjust based on the next change value. Perform grouped flow adjustments. Iterate through all flow adjustment values, all flow groups, and all power plants, calculating until all calculations are complete, completing one iteration and obtaining the latest result. .

[0137] (7) Calculate repeatedly for the specified number of iterations, or until... The iteration stops when the value no longer decreases. This cyclical calculation process is typically performed by writing a computer program.

[0138] (8) After completing the iterative calculation, the statistical results of the negative flow values ​​at each cross-section are shown in Table 5 below:

[0139] Table 5

[0140]

[0141] (9) Obtain the optimal power generation flow rate (Q) under the grouped load (N) and grouped head (H), and redraw the calibrated flow characteristic curve (NHQ curve) accordingly. The calibrated flow characteristic curve of the first-stage power station is as follows: Figure 3 As shown in the figure, different colors represent the load-flow relationship of the unit under different water heads.

[0142] It should be noted that the detailed flowchart of the calibration method for the flow characteristic curve of hydropower station generator units proposed in this embodiment can be seen as follows: Figure 4 As shown, it will not be elaborated further here.

[0143] The calibration method for the flow characteristic curve of a hydropower station generator set provided in this embodiment has the following advantages:

[0144] 1. The automatic calibration of the flow characteristic curves of multiple hydropower station units in a cascade has been achieved, which greatly improves the efficiency of calibration work. Taking the curve calibration of 6 cascade power stations in a certain river basin as an example, the existing technology requires 40 to 60 man-days, while the method of this invention only requires 3 to 5 man-days to complete the data processing and curve calibration of the power generation flow of the 6 cascade power stations for the past 5 years.

[0145] 2. It effectively utilized the actual operation data of the cascade hydropower stations and the monitoring data of relevant hydrological stations in the basin, and rationally coordinated the water balance between upstream and downstream cascade hydropower stations and between hydropower stations and hydrological stations, thus achieving overall rationality of water resource data at various sections of the basin.

[0146] 3. It can comprehensively calibrate the load range and head range of the actual operation of the unit, while other test methods can often only select a certain number of operating conditions for verification and calibration.

[0147] 4. It significantly improves the calibration accuracy of the unit's flow characteristic curve, especially for the load and head conditions that the power station frequently operates under, where the monitoring data is more abundant and the calibration accuracy is higher. The calculation error after curve calibration is only about 1%.

[0148] In summary, the calibration method for the flow characteristic curve of a hydropower station generator set proposed in this embodiment can efficiently and accurately calibrate the flow characteristic curve of the hydropower station generator set.

[0149] Example 2

[0150] Figure 5 This is a structural diagram of a calibration system for the flow characteristic curve of a hydropower station generator unit according to an embodiment of this application, as shown below. Figure 5 As shown, the system includes:

[0151] The acquisition module 100 is used to acquire the generating head of each unit in the cascade hydropower station, the generating load of each unit in the cascade hydropower station, and the initial flow characteristic curve of each unit, and to determine the initial generating flow of each unit based on the initial flow characteristic curve.

[0152] The grouping module 200 is used to group the initial power generation flow of each unit according to the power generation head and power generation load of each unit in the cascade hydropower station, and to obtain the power generation flow under each flow group.

[0153] Discrete module 300 is used to determine the adjustment range of power generation flow under each flow group, and to discretize the adjustment range of power generation flow under each flow group to obtain the power generation flow change value corresponding to each flow group, thus forming a sequence of power generation flow change values ​​under each flow group.

[0154] The calibration module 400 is used to calibrate the initial power generation flow of each unit according to the power generation flow change value sequence under each flow group, and obtain the calibrated generator unit flow characteristic curve of the cascade hydropower station.

[0155] In this embodiment of the disclosure, the grouping module 200 is further configured to:

[0156] The maximum and minimum power generation heads of the cascade hydropower stations are determined based on the power generation heads of each power generation head in the cascade hydropower stations.

[0157] The power generation heads of the cascade hydropower stations are grouped according to a preset first range threshold to obtain the power generation heads of each head group.

[0158] The maximum and minimum power generation loads within the cascade hydropower stations are determined based on the power generation loads of each generating unit within the cascade hydropower stations.

[0159] The power generation load of each unit in the cascade hydropower station is grouped according to the preset second range threshold to obtain the power generation load under each load group.

[0160] The power generation head under each head group is combined with the power generation load under each load group, and the power generation flow rate under each combination is determined. The power generation flow rate under each combination is used as the power generation flow rate under each flow rate group.

[0161] In this embodiment of the disclosure, the discrete module 300 is further configured to:

[0162] Determine the minimum value and minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station;

[0163] Based on the minimum value and the minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station, the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is constructed.

[0164] in, , This represents the total number of cascade hydropower stations. This represents the total number of flow groups within a hydroelectric power station.

[0165] The formula for calculating the minimum adjustment range of the power generation flow under the k-th flow group of the i-th hydropower station is as follows:

[0166]

[0167] The formula for calculating the maximum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is as follows:

[0168]

[0169] In the formula, This represents the minimum adjustment range of the power generation flow rate under the k-th flow group of the i-th hydropower station. Let be the average power generation load of the k-th flow group of the i-th hydropower station. Let be the average head for generating electricity in the k-th flow group of the i-th hydropower station. Let be the average power generation flow of the k-th flow group of the i-th hydropower station. This is the upper limit of the overall output coefficient. This represents the maximum adjustment range of power generation flow under the k-th flow group of the i-th hydropower station. This represents the lower limit of the overall output coefficient.

[0170] In this embodiment of the disclosure, the calibration module 400 is further configured to:

[0171] Step E1: Obtain the power generation flow of the upstream power station or hydrological station of each level of the cascade hydropower station and the inflow of each level of hydropower station within the preset time period. Then, based on the power generation flow of the upstream power station or hydrological station of each level of hydropower station and the inflow of each level of hydropower station within the preset time period, determine the average interval flow of each level of hydropower station within the preset time period using the rolling average or moving average method.

[0172] Step E2: Summarize the total number of time periods when the average interval flow of all cascade hydropower stations is negative, and use the total number of time periods as the initial total number of negative time periods for the cascade hydropower stations;

[0173] Step E3: Initialize parameters i, k, r, d, etc., setting i=1, k=1, r=1, d=1;

[0174] Step E4: Use the rth change value in the sequence of power generation flow change values ​​of the kth flow group in the i-th hydropower station to adjust the power generation flow of the kth flow group after the (r-1)th calibration, so as to obtain the rth power generation flow within the kth flow group in the i-th hydropower station.

[0175] Step E5: Based on the r-th power generation flow in each flow group of the i-th hydropower station, determine the total number of negative value periods for the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station;

[0176] Step E6: Determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the minimum total number of negative periods of the cascade hydropower stations. If so, take the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station as the minimum total number of negative periods of the cascade hydropower stations, and take the r-th power generation flow in the k-th flow group of the i-th hydropower station as the power generation flow of the k-th flow group of the i-th hydropower station after the r-th calibration. Wherein, when r=1, determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the initial total number of negative periods of the cascade hydropower stations.

[0177] Step E7: Determine if r is equal to R. If yes, proceed to step E8; otherwise, set r = r + 1 and return to step E4, where R is the preset first threshold.

[0178] Step E8: Determine if k equals K. If yes, proceed to step E9; otherwise, set k = k + 1, r = 1, and return to step E4.

[0179] Step E9: Determine if i equals I. If yes, proceed to step E10; otherwise, set i = i + 1, r = 1, k = 1, and return to step E4, where I is the third threshold.

[0180] Step E10: Determine whether d is equal to D. If yes, construct the generator flow characteristic curve of the i-th hydropower station based on the calibration power generation flow of each flow group of the i-th hydropower station obtained in the Dth iteration. Otherwise, let d = d + 1 and return to step E3, where D is the second threshold.

[0181] In summary, the calibration system for the flow characteristic curve of a hydropower station generator set proposed in this embodiment can efficiently and accurately calibrate the flow characteristic curve of the hydropower station generator set.

[0182] Example 3

[0183] To implement the above embodiments, this disclosure also proposes an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the method described in Embodiment 1.

[0184] Example 4

[0185] To implement the above embodiments, this disclosure also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in Embodiment 1.

[0186] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0187] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0188] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A calibration method for the flow characteristic curve of a hydropower station generator unit, characterized in that, The method includes: The initial flow characteristic curves of each generating head, generating load of each unit in the cascade hydropower station and the initial flow characteristic curves of each unit are obtained, and the initial generating flow of each unit is determined based on the initial flow characteristic curves. Based on the generating head and generating load of each unit in the cascade hydropower station, the initial generating flow of each unit is grouped to obtain the generating flow under each flow group. The adjustment range of the power generation flow under each flow group is determined, and the adjustment range of the power generation flow under each flow group is discretized to obtain the power generation flow change value corresponding to the power generation flow under each flow group, thus forming a sequence of power generation flow change values ​​under each flow group. The initial power generation flow of each unit is calibrated based on the power generation flow change sequence under each flow group, resulting in the calibrated flow characteristic curves of the generator units of the cascade hydropower stations, including: Step F1: Obtain the power generation flow of the upstream power station or hydrological station of each level of the cascade hydropower station and the inflow of each level of hydropower station within the preset time period. Then, based on the power generation flow of the upstream power station or hydrological station of each level of hydropower station and the inflow of each level of hydropower station within the preset time period, determine the average interval flow of each level of hydropower station within the preset time period using the rolling average or moving average method. Step F2: Summarize the total number of time periods when the average interval flow of all cascade hydropower stations is negative, and use the total number of time periods as the initial total number of negative time periods for the cascade hydropower stations; Step F3: Initialize the parameters i, k, r, and d, setting i=1, k=1, r=1, and d=1; Step F4: Use the rth change value in the sequence of power generation flow change values ​​of the kth flow group in the i-th hydropower station to adjust the power generation flow of the kth flow group after the (r-1)th calibration, so as to obtain the rth power generation flow within the kth flow group in the i-th hydropower station. Step F5: Based on the r-th power generation flow in each flow group of the i-th hydropower station, determine the total number of negative periods for the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station; Step F6: Determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the minimum total number of negative periods of the cascade hydropower stations. If so, take the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station as the minimum total number of negative periods of the cascade hydropower stations, and take the r-th power generation flow in the k-th flow group of the i-th hydropower station as the power generation flow of the k-th flow group of the i-th hydropower station after the r-th calibration. Wherein, when r=1, determine whether the total number of negative periods of the cascade hydropower stations corresponding to the r-th power generation flow of the i-th hydropower station is less than the initial total number of negative periods of the cascade hydropower stations. Step F7: Determine if r is equal to R. If yes, proceed to step F8; otherwise, set r = r + 1 and return to step F4, where R is the preset first threshold. Step F8: Determine if k is equal to K. If yes, proceed to step F9; otherwise, set k = k + 1, r = 1, and return to step F4. Step F9: Determine if i equals I. If yes, proceed to step F10; otherwise, set i = i + 1, r = 1, k = 1, and return to step F4. Step F10: Determine whether d is equal to D. If yes, construct the generator flow characteristic curve of the i-th hydropower station based on the calibration power generation flow of each flow group of the i-th hydropower station obtained in the D-th iteration. Otherwise, let d = d + 1 and return to step F3, where D is the second threshold. in, , This represents the total number of cascade hydropower stations. This represents the total number of flow groups within a hydroelectric power station.

2. The method as described in claim 1, characterized in that, The process of grouping the initial power generation flow of each unit according to the generating head and generating load of each unit in the cascade hydropower station to obtain the power generation flow under each flow group includes: The maximum and minimum power generation heads of the cascade hydropower stations are determined based on the power generation heads of each power generation head in the cascade hydropower stations. The power generation heads of the cascade hydropower stations are grouped according to a preset first range threshold to obtain the power generation heads of each head group. The maximum and minimum power generation loads within the cascade hydropower stations are determined based on the power generation loads of each generating unit within the cascade hydropower stations. The power generation load of each unit in the cascade hydropower station is grouped according to the preset second range threshold to obtain the power generation load under each load group. The power generation head under each head group is combined with the power generation load under each load group, and the power generation flow rate under each combination is determined. The power generation flow rate under each combination is used as the power generation flow rate under each flow rate group.

3. The method as described in claim 2, characterized in that, Determining the adjustment range of power generation flow under each flow group includes: Determine the minimum value and minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station; The power generation flow adjustment range for the k-th flow group of the i-th hydropower station is constructed based on the minimum value and the minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station.

4. The method as described in claim 3, characterized in that, The formula for calculating the minimum adjustment range of the power generation flow under the k-th flow group of the i-th hydropower station is as follows: The formula for calculating the maximum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is as follows: In the formula, This represents the minimum adjustment range of the power generation flow rate under the k-th flow group of the i-th hydropower station. Let be the average power generation load of the k-th flow group of the i-th hydropower station. Let be the average head for generating electricity in the k-th flow group of the i-th hydropower station. Let be the average power generation flow of the k-th flow group of the i-th hydropower station. This is the upper limit of the overall output coefficient. This represents the maximum adjustment range of power generation flow under the k-th flow group of the i-th hydropower station. This represents the lower limit of the overall output coefficient.

5. A calibration system for the flow characteristic curve of a hydropower station generator unit, based on the calibration method for the flow characteristic curve of a hydropower station generator unit according to any one of claims 1-4, characterized in that, The system includes: The acquisition module is used to acquire the generating head of each unit in the cascade hydropower station, the generating load of each unit in the cascade hydropower station, and the initial flow characteristic curve of each unit, and to determine the initial generating flow of each unit based on the initial flow characteristic curve. The grouping module is used to group the initial power generation flow of each unit according to the power generation head and power generation load of each unit in the cascade hydropower station, and to obtain the power generation flow under each flow group. The discrete module is used to determine the adjustment range of the power generation flow under each flow group, and to discretize the adjustment range of the power generation flow under each flow group to obtain the power generation flow change value corresponding to the power generation flow under each flow group, thus forming a sequence of power generation flow change values ​​under each flow group. The calibration module is used to calibrate the initial power generation flow of each unit based on the power generation flow change value sequence under each flow group, and obtain the calibrated generator unit flow characteristic curve of the cascade hydropower station.

6. The system as described in claim 5, characterized in that, The grouping module is also used for: The maximum and minimum power generation heads of the cascade hydropower stations are determined based on the power generation heads of each power generation head in the cascade hydropower stations. The power generation heads of the cascade hydropower stations are grouped according to a preset first range threshold to obtain the power generation heads of each head group. The maximum and minimum power generation loads within the cascade hydropower stations are determined based on the power generation loads of each generating unit within the cascade hydropower stations. The power generation load of each unit in the cascade hydropower station is grouped according to the preset second range threshold to obtain the power generation load under each load group. The power generation head under each head group is combined with the power generation load under each load group, and the power generation flow rate under each combination is determined. The power generation flow rate under each combination is used as the power generation flow rate under each flow rate group.

7. The system as described in claim 6, characterized in that, The discrete module is also used for: Determine the minimum value and minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station; Based on the minimum value and the minimum value of the power generation flow adjustment range under the k-th flow group of the i-th hydropower station, the power generation flow adjustment range under the k-th flow group of the i-th hydropower station is constructed. in, , This represents the total number of cascade hydropower stations. This represents the total number of flow groups within a hydroelectric power station.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method as described in any one of claims 1-4.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-4.

Images