Return water storage capacity estimation method and system for water-wind-light collaborative stabilizing fluctuation output reservoir
By taking the fluctuation output time series of wind, photovoltaic power as input, the water rechargeable amount required for the reservoir is calculated, and the problem of estimating the water rechargeable amount of the reservoir during the coordinated operation of water, wind and light is solved, decision-making support is provided, and water resource utilization efficiency is improved.
Patent Information
- Application Number
- CN202411669002.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-03-07
AI Technical Summary
The prior art is difficult to effectively estimate the amount of water recharge required by the reservoir during the coordinated operation of water, wind and light, and cannot meet the needs of whether water and electricity meet the prerequisites for water, wind and light coordination in terms of water.
By taking the fluctuation output time series of wind and photoelectricity, the sliding average window length, the installed capacity of water and electricity, and the water consumption rate of water and electricity as inputs, the hydropower output process that can smooth the output of wind and light fluctuation at a given sliding average window length is calculated, and the return water storage required by the reservoir is automatically estimated.
It provides a more powerful reference basis, providing decision-making support for whether reservoir scheduling and water power meet the prerequisites for water, wind and light coordination in terms of water volume, and improving the efficient utilization of water resources.
Smart Images
Figure CN119578710A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of water resource analysis, and in particular to a method and system for estimating the amount of recharged water in a reservoir with output fluctuations coordinated by water, wind and solar power. Background Art
[0002] The amount of water required for the coordinated operation of water, wind and solar power to smooth the fluctuating output of the reservoir is mainly used to study the prerequisites for hydropower to smooth the fluctuating output of wind power and photovoltaic power, and then provide decision-making support for the coordinated planning and management of hydropower and new energy. Convenient water volume estimation in the coordinated operation of water, wind and solar power is of great significance for the efficient utilization of various clean energy sources including water resources. At present, the water volume analysis of the coordinated operation of water, wind and solar power at home and abroad is mainly concentrated in the post-evaluation stage of the coordinated operation of water, wind and solar power, and rarely considers whether the prerequisites required for the coordinated operation are complete, which cannot meet the needs of judging whether the basic conditions are met before the coordinated operation of water, wind and solar power in actual production. In view of this, if the amount of water required for the coordinated operation of water, wind and solar power to smooth the fluctuating output of the reservoir can be estimated, it can provide a more powerful reference basis for reservoir scheduling.
[0003] Therefore, it is necessary to design a method and system for estimating the rechargeable water volume of a reservoir that uses water, wind and solar power to coordinate and smooth the fluctuating output, in order to solve the above problems. Summary of the invention
[0004] In order to avoid the above problems, a method and system for estimating the rechargeable water volume of a reservoir with hydro-wind-solar synergy to smooth out fluctuating output is provided. The method and system take the fluctuating output time series of wind and solar power, the sliding average window length, the hydropower installed capacity and the hydropower water consumption rate as input. The method can calculate the hydropower output process that can smooth out the fluctuating output of wind and solar power under a given sliding average window length, automatically estimate the rechargeable water volume required for the reservoir, and provide a reference for judging whether the hydropower meets the prerequisites for hydro-wind-solar synergy in terms of water volume.
[0005] The present invention provides a method and system for estimating the amount of recharged water in a reservoir with hydro-wind-solar synergy to smooth output fluctuations, comprising the following steps:
[0006] Step 1: Analyze the fluctuating output time series, denoted as {t n ,p n}, where t n is the time of the nth control point, n=1,2,...,N, N is the total number of control points, p n Output the fluctuation of the nth control point;
[0007] Step 2, set the length s of the sliding average window, 3≤s≤N / 2;
[0008] Step 3: Calculate the time series of fluctuating output after sliding average, denoted as {t n ,p′ n};
[0009] Step 4, calculate the amplitude Δp of the fluctuating output translation;
[0010] Step 5, considering the minimum output limit of the hydropower unit, correct the amplitude Δp′ of the fluctuating output translation;
[0011] Step 6, calculate the output time series after the coordination of hydropower, wind and light, denoted as
[0012] Step 7, calculate the output time series of hydropower, denoted as
[0013] Step 8, calculate the hydropower generation E required for the coordination of hydropower, wind and light to suppress the fluctuating output hy ;
[0014] Step 9, calculate the water storage volume W required for the coordination of hydropower, wind and light to suppress the fluctuating output.
[0015] Preferably, in Step 1, the fluctuating output time series is obtained in a rectangular coordinate system, with time t as the abscissa and fluctuating output p as the ordinate according to the process of the fluctuating output; the analysis process includes analyzing the fluctuating output time series into a broken line composed of several connected points.
[0016] Preferably, Step 3 is specifically:
[0017] When 1 ≤ n ≤ N - s + 1, use the formula to calculate p′ n ;
[0018] When N - s + 1 < n ≤ N, use the formula to calculate p′ n .
[0019] Preferably, in Step 4, Δp = max{p n - p′ n}, n = 1, 2,..., N; in Step 5, Δp′ = max(Δp, p min ).
[0020] Preferably, in Step 6, In Step 7, where IC hy is the installed capacity of hydropower.
[0021] Preferably, in Step 8, the hydropower generation required to suppress the fluctuation is obtained according to the output process, and the calculation formula is:
[0022]
[0023] Where i is the index of the time interval of the N control points, ranging from 1 to N-1, indicating the position of the fluctuating output or the hydropower output p after smoothing in the time series.
[0024] Preferably, in step 9, the calculation formula is: W = η × E hy , η is the water consumption rate of hydropower, and is an empirically set constant. Finally, the required amount of water to be stored in the reservoir for the coordinated smoothing of fluctuating output of water, wind and solar power is obtained. The larger the value, the more water the reservoir should store to meet the needs of the coordinated smoothing of fluctuating output of water, wind and solar power.
[0025] A system for estimating the amount of recharged water of a reservoir with hydropower, wind power and solar power coordinated to smooth the fluctuation of power output, comprising:
[0026] Initial analysis module: According to the process of fluctuating output, the fluctuating output time series {t n ,p n}, and perform preliminary analysis on it;
[0027] Sliding average calculation module: Set the length s of the sliding average window, perform sliding average processing on the fluctuating output data, and calculate the fluctuating output time series after sliding average, recorded as {t n ,p′ n};
[0028] Amplitude adjustment module: calculate the amplitude of the fluctuation output translation Δp, and correct the amplitude of the fluctuation output translation according to the minimum output of the hydropower unit, which is recorded as Δp′;
[0029] Synergistic output calculation module: Calculate the output time series of water, wind and solar synergy by using the corrected translation amplitude And the time series of hydropower output is recorded as
[0030] Recharge water estimation module: Calculate the hydropower generation required for wind and solar synergy to smooth the fluctuating output, denoted as E hy ; Then, the amount of water storage W required for the reservoir to stabilize the fluctuating output of water, wind and solar power is calculated based on the water consumption rate of hydropower;
[0031] The estimation system is used to implement the method for estimating the rechargeable water volume of a reservoir with water-wind-solar collaborative output to smooth fluctuations as described in any one of claims 1 to 7.
[0032] Compared with the prior art, the present invention has the following beneficial effects: The present invention is mainly applied to the estimation of the recharge water volume required for a reservoir to suppress the fluctuating power output in the coordinated operation of water, wind, and solar power. In the application of water resource analysis, by taking the fluctuating power output time series of wind and solar power, the sliding average window length, the installed capacity of hydropower, and the water consumption rate of hydropower as inputs, the hydropower output process that can suppress the fluctuations of wind and solar power can be automatically calculated under a given sliding average window length, and the recharge water volume required for the reservoir can be automatically estimated. Furthermore, it provides a reference basis for judging whether the water volume of hydropower meets the prerequisite conditions for the coordinated operation of water, wind, and solar power. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 Schematic diagram of the fluctuating power output time series of a preferred embodiment of the present invention;
[0034] Figure 2 Schematic diagram of the fluctuating power output time series after sliding average and the power output time series after the coordinated operation of water, wind, and solar power when the sliding average window length s takes 6 in a preferred embodiment of the present invention;
[0035] Figure 3 Schematic diagram of the hydropower output time series when the installed capacity of hydropower takes 25 MW in a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be introduced below in conjunction with embodiments and drawings.
[0037] As Figures 1 to 3 shown, a method and system for estimating the recharge water volume of a reservoir for suppressing fluctuating power output in the coordinated operation of water, wind, and solar power provided in this embodiment includes the following steps:
[0038] Step 1: Analyze the fluctuating power output time series into a broken line composed of several points; with time t as the abscissa and fluctuating power output p as the ordinate, refer to Figure 1 .
[0039] Step 2: Set the length s of the sliding average window, and select s = 6 according to the given condition 3 ≤ s ≤ N / 2.
[0040] Step 3: Calculate the fluctuating power output time series after sliding average, denoted as {t n , p′ n}, where the unit of p′ n is MW, and the implementation is as follows: When 1 ≤ n ≤ N - s + 1, use the formula to calculate p′ n ; when N - s + 1 < n ≤ N, use the formula to calculate p′ n .
[0041] Step 4, calculate the amplitude of the upward translation, denoted as Δp, where the unit of Δp is MW, and is implemented as follows: Δp = max{p n -p′ n}, n=1,2,...,N.
[0042] Step 5: Considering the minimum output limit of the hydropower unit, the amplitude of the upward translation is corrected, which is recorded as Δp′, and the unit of Δp′ is MW, which is implemented as follows: Δp′=max(Δp,p min ).
[0043] Step 6: Calculate the output time series after the coordination of water, wind and solar power, recorded as The unit is MW and is implemented as follows: See also Figure 2 .
[0044] Step 7: Calculate the time series of hydropower output, recorded as The unit is MW and is implemented as follows: Among them, IC hy is the installed capacity of hydropower. In this embodiment, the installed capacity of hydropower is 25MW. IC hy The unit is MW; see Figure 3 .
[0045] Step 8: Calculate the hydropower generation required for the coordinated smoothing of fluctuating output by water, wind and solar power, denoted as E hy , E hy The unit is MWh and is implemented as follows:
[0046]
[0047] Where i is the index of the time interval of N control points, ranging from 1 to N-1, indicating the position of the fluctuating output or the hydropower output after stabilization p in the time series; the power generation E is calculated by hy It is 392.2MWh.
[0048] Step 9: Calculate the amount of water storage required for the coordinated smoothing of fluctuating output by water, wind and solar power, denoted as W, where the unit of W is m 3 , implemented as follows: W = η × E hy , where η is the water consumption rate of hydropower. In this embodiment, η is 0.917m 3 / MWh, and finally the amount of water storage required for the coordinated smoothing of fluctuating output by water, wind and solar power is 359.6m 3 .
[0049] When this embodiment is implemented, a system for estimating the amount of water storage required for a reservoir with fluctuating output that is coordinated by water, wind and solar power is used to implement the system, which includes the following modules:
[0050] Initial parsing module: This module is responsible for the preliminary parsing of the fluctuating output time series. According to the process of the fluctuating output, with time t as the abscissa and the fluctuating output p as the ordinate, it is obtained;
[0051] Moving average calculation module: This module is used to perform a moving average process on the fluctuating output data. Set the length of the moving average window, denoted as s, where 3 ≤ s ≤ N / 2, and the unit of s is h; in this embodiment, s = 6 is selected; calculate the time series of the fluctuating output after the moving average, denoted as {t n , p′ n}, p′ n The unit of which is MW, and it is implemented as follows: when 1 ≤ n ≤ N - s + 1, use the formula to calculate p′ n , when N - s + 1 < n ≤ N, use the formula to calculate p′ n ;
[0052] Amplitude adjustment module: This module automatically calculates the upward translation amplitude according to the correction condition, and corrects it according to the minimum output of the hydropower unit. Calculate the upward translation amplitude, denoted as Δp, and the unit of Δp is MW, and it is implemented as follows: Δp = max{p n - p′ n}, n = 1, 2,..., N; considering the minimum output limit of the hydropower unit, correct the upward translation amplitude, denoted as Δp′, and the unit of Δp′ is MW, and it is implemented as follows: Δp′ = max(Δp, p min );
[0053] Coordinated output calculation module: This module calculates the output time series of hydropower by using the corrected translation amplitude, denoted as The unit of which is MW, and it is implemented as follows: where IC hy is the installed capacity of hydropower. In the embodiment, the installed capacity of hydropower is taken as 25 MW, and the unit of IC hy is MW;
[0054] Backwater storage volume estimation module: Calculate the hydropower generation required for the coordinated suppression of fluctuating output by water, wind and light, denoted as E hy ; Then, this module calculates the result of the backwater storage volume required for the reservoir to coordinate the suppression of fluctuating output by water, wind and light according to the water consumption rate of hydropower;
[0055] Calculate the hydropower generation required for the coordinated suppression of fluctuating output by water, wind and light, denoted as E hy , E hy The unit of which is MWh, and it is implemented as follows. Obtain the power generation required for suppressing fluctuations according to the output process; Where i is the index of the time interval of N control points, ranging from 1 to N-1, indicating the position of the fluctuating output or the hydropower output p after stabilization in the time series;
[0056] Calculate the amount of water storage required for the coordinated smoothing of fluctuating output by water, wind and solar power, denoted as W, where the unit of W is m 3 , implemented as follows: W = η × E hy , where η is the water consumption rate of hydropower, and the unit of η is m 3 / MWh, in this embodiment, η is 0.917m 3 / MWh.
[0057] Finally, the result of the amount of water recharge required for the reservoir to coordinate water, wind and solar power to smooth the fluctuating power output is obtained. The larger the value, the more water the reservoir should recharge to meet the needs of the coordinated water, wind and solar power to smooth the fluctuating power output.
[0058] The present invention is mainly used to estimate the amount of recharged water required for smoothing the fluctuating output of the reservoir in the synergy of water, wind and solar power. In the water resources analysis application, the fluctuating output time series of wind and solar power, the sliding average window length, the installed capacity of hydropower and the water consumption rate of hydropower are used as inputs, and the hydropower output process that can smooth the fluctuating output of wind and solar power under a given sliding average window length can be automatically calculated, and the amount of recharged water required for the reservoir can be automatically estimated, thereby providing a reference for judging whether the hydropower meets the prerequisites for the synergy of water, wind and solar power in terms of water volume. Compared with the existing related technologies, the innovation of the present invention lies in estimating the amount of recharged water required for the reservoir by the process of hydropower output in smoothing the fluctuation of wind and solar power. In view of this, the rationality of the technical solution of the present invention can be verified by applying the present invention to the estimation of the amount of recharged water and obtaining the corresponding water volume value. Figures 2-3 It can be seen that the technical solution proposed in the present invention can indeed automatically calculate the hydropower output process of smoothing the fluctuating output. Furthermore, the amount of water storage can be automatically estimated according to the input hydropower water consumption rate.
[0059] Through the results of the examples, it can be seen that the technical solution proposed by the present invention estimates the amount of water required for the reservoir to stabilize the fluctuating output, which illustrates the effectiveness of the present invention. It can be seen that the present invention can automatically and effectively estimate the amount of water required for the reservoir in the water-wind-solar synergy, providing decision support for the development and utilization of water resources.
[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for estimating the amount of water storage in a reservoir with output fluctuations stabilized by the synergy of water, wind and solar power, characterized in that: The steps include: Step 1: Analyze the fluctuating output time series, denoted as {t n ,p n }, where t n is the time of the nth control point, n=1,2,...,N, N is the total number of control points, p n Output the fluctuation of the nth control point; Step 2, set the length s of the sliding average window, 3≤s≤N / 2; Step 3: Calculate the time series of fluctuating output after sliding average, denoted as {t n ,p′ n }; Step 4, calculating the amplitude Δp of the fluctuation output translation; Step 5: Considering the minimum output limit of the hydropower unit, correct the amplitude Δp′ of the fluctuation output shift; Step 6: Calculate the output time series after the coordination of water, wind and solar power, recorded as Step 7: Calculate the time series of hydropower output, recorded as Step 8: Calculate the hydropower generation E required for the coordinated smoothing of fluctuating output by hydropower, wind and solar power hy ; Step 9, calculate the amount of reclaimed water W required for the coordinated smoothing of fluctuating power output by water, wind and solar power.
2. The method for estimating the amount of water storage in a reservoir with hydropower, wind power and solar power coordinated to smooth the fluctuation of power output as claimed in claim 1, characterized in that: In step 1, the fluctuating output time series is obtained in a rectangular coordinate system according to the fluctuating output process, with time t as the horizontal coordinate and the fluctuating output p as the vertical coordinate; the analysis process includes analyzing the fluctuating output time series into a broken line composed of a number of points.
3. The method for estimating the amount of water storage in a reservoir with hydropower, wind power and solar power coordinated to smooth the fluctuation of power output as claimed in claim 1, characterized in that: Step 3 is as follows: When 1≤n≤N-s+1, use the formula Calculate p′ n ; When N - s + 1 < n ≤ N, use the formula to calculate p′ n .
4. The method for estimating the amount of recharged water in a reservoir with hydropower, wind power and solar power combined to stabilize power fluctuations as claimed in claim 1, characterized in that: In step 4, Δp = max{p n -p′ n }, n=1,2,...,N; in step 5, Δp′=max(Δp,p min ).
5. The method for estimating the amount of recharged water in a reservoir with hydro-wind-solar synergy to smooth output fluctuations as claimed in claim 1, characterized in that: In step 6, In step 7, Among them, IC hy The installed capacity of hydropower.
6. The method for estimating the amount of recharged water in a reservoir with hydropower, wind power and solar power coordinated to smooth output fluctuations as claimed in claim 1, characterized in that: In step 8, the hydropower generation required to smooth the fluctuation is obtained according to the output process, and the calculation formula is: Where i is the index of the time interval of the N control points, ranging from 1 to N-1, indicating the position of the fluctuating output or the hydropower output p after smoothing in the time series.
7. The method for estimating the amount of recharged water in a reservoir with hydropower, wind power and solar power coordinated to smooth output fluctuations as claimed in claim 1, characterized in that: In step 9, the calculation formula is: W = η × E hy , η is the water consumption rate of hydropower, which is an empirically set constant.
8. A system for estimating the amount of water storage in a reservoir with fluctuating power output stabilized by using water, wind and solar power, characterized in that: include: Initial analysis module: According to the process of fluctuating output, the fluctuating output time series {t n ,p n }, and perform preliminary analysis on it; Sliding average calculation module: Set the length s of the sliding average window, perform sliding average processing on the fluctuating output data, and calculate the fluctuating output time series after sliding average, recorded as {t n ,p′ n }; Amplitude adjustment module: calculate the amplitude of the fluctuation output translation Δp, and correct the amplitude of the fluctuation output translation according to the minimum output of the hydropower unit, which is recorded as Δp′; Synergistic output calculation module: Calculate the output time series of water, wind and solar synergy by using the corrected translation amplitude And the time series of hydropower output is recorded as Recharge water estimation module: Calculate the hydropower generation required for wind and solar synergy to smooth the fluctuating output, denoted as E hy ; Then, the amount of water storage W required for the reservoir to stabilize the fluctuating output of water, wind and solar power is calculated based on the water consumption rate of hydropower; The estimation system is used to implement the method for estimating the rechargeable water volume of a reservoir with water-wind-solar collaborative output to smooth fluctuations as described in any one of claims 1 to 7.