CN118069957A - Uniform-output-step hydropower station/group runoff compensation adjustment calculation method - Google Patents
Uniform-output-step hydropower station/group runoff compensation adjustment calculation method Download PDFInfo
- Publication number
- CN118069957A CN118069957A CN202410462435.1A CN202410462435A CN118069957A CN 118069957 A CN118069957 A CN 118069957A CN 202410462435 A CN202410462435 A CN 202410462435A CN 118069957 A CN118069957 A CN 118069957A
- Authority
- CN
- China
- Prior art keywords
- output
- hydropower station
- runoff
- group
- station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004364 calculation method Methods 0.000 title claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000003860 storage Methods 0.000 claims abstract description 32
- 238000009434 installation Methods 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 66
- 230000008569 process Effects 0.000 claims description 36
- 238000010248 power generation Methods 0.000 claims description 32
- 230000033228 biological regulation Effects 0.000 claims description 17
- 238000004146 energy storage Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000006870 function Effects 0.000 description 15
- 238000005265 energy consumption Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004422 calculation algorithm Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- OWZREIFADZCYQD-NSHGMRRFSA-N deltamethrin Chemical compound CC1(C)[C@@H](C=C(Br)Br)[C@H]1C(=O)O[C@H](C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 OWZREIFADZCYQD-NSHGMRRFSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Control Of Water Turbines (AREA)
Abstract
The invention discloses a uniform-output cascade hydropower station/group runoff compensation adjustment calculation method. Constructing an objective function based on the principle that the generating capacity of the hydropower station/group is maximum and the square sum of the power output difference of adjacent time periods of the hydropower station/group is minimum; setting constraint conditions of an objective function to complete construction of a runoff compensation adjustment calculation model, wherein the constraint conditions comprise a water quantity balance equation, reservoir water storage capacity constraint, reservoir lower discharge limit and installation limit; and solving the runoff compensation adjustment calculation model. The invention can improve the calculation speed and the calculation precision.
Description
Technical Field
The invention belongs to the fields of multi-energy complementation and novel energy storage research, and particularly relates to a uniform-output step hydropower station/group runoff compensation adjustment calculation method based on new energy consumption and water-electricity adjustment capacity maintenance under a novel electric power system.
Background
With the wide application of computer technology, the hydropower station runoff regulation calculation method is converted into a numerical calculation method by a traditional list algorithm and a graphic method. The method mainly realizes the joint solution of a water quantity balance equation and an output equation. The university of Dalian university proposes to carry out numerical solution by adopting an improved Euler method for the first time in 1981, and after a few researches are carried out on the numerical solution, the numerical solution is carried out on hydropower station runoff adjustment by adopting a dichotomy method, an improved Euler method, a fixed point iteration method and a Newton iteration method respectively, and each method has advantages and disadvantages. Compared with the iteration of the dichotomy, the improved Euler iteration method has the advantages that the precision is lower than the calculation result of the dichotomy, the power generation flow still needs to be iterated, and the overall efficiency is not greatly improved. The newton iteration method is difficult to use in practice because the derivation calculation is complex, and the variation of head loss with uneven output and output coefficient with the efficiency of the installation is difficult to consider simply by a function. The improved fixed point iterative method is compared with the dichotomy iterative calculation, and the fixed point iterative convergence speed is about 3 times of the dichotomy. The advantages of the iterative convergence speed of the fixed point are also less and less prominent due to the high-speed development of the computer.
In the hydropower cascade runoff adjustment calculation, the water energy of the compensated power station is adjusted, and the output process of each compensated power station is usually calculated according to single-reservoir equal-flow water energy adjustment calculation. And then, the output processes of all the compensated power stations are overlapped at the same time to obtain the total output process of the compensated power station, and the total output process is taken as a compensation object. In order to make the output of the hydropower station/group in the non-flood period as uniform as possible, the equal-flow hydropower station/group is not calculated by adjusting the hydropower station, but the equal-flow hydropower station is calculated by adjusting the hydropower station according to the normal water storage level, the dead water level and the natural runoff process of the compensated power station, and the requirement of comprehensively utilizing water is considered. Obviously, the water supply period is regulated according to the equal output regulation, the water storage period works according to the equal flow regulation or the maximum water passing capacity of the hydropower station (the output is controlled by the installed capacity of the hydropower station), the output process line of the compensated power station is obtained, and the output process line is even compared with the output process line obtained by the equal flow regulation which is usually adopted, so that the compensation benefit is also larger.
The method can exert the adjustment and compensation functions of the hydropower steps as much as possible in the traditional power system, and the compensation benefit is maximum; however, under the background of a novel power system, because new energy sources are connected in a large scale and high proportion, wind power and photovoltaic output have larger uncertainty, the effect of flexible adjustment of the hydropower station is required to be fully exerted, the new energy sources are eliminated as much as possible, meanwhile, the adjustment performance of the hydropower station is also influenced differently, and therefore, further research on compensation adjustment in hydropower station/group runoff adjustment calculation under the background of the novel power system is required.
Disclosure of Invention
The invention aims to provide a uniform-output-step hydropower station/group runoff compensation adjustment calculation method. The invention can improve the calculation speed and the calculation precision.
The technical proposal is that. A uniform power-output cascade hydropower station/group runoff compensation adjustment calculation method is used for constructing an objective function based on the principle that the generating capacity of the hydropower station/group is maximum and the square sum of power-output differences in adjacent time periods of the hydropower station/group is minimum; setting constraint conditions of an objective function to complete construction of a runoff compensation adjustment calculation model, wherein the constraint conditions comprise a water quantity balance equation, reservoir water storage capacity constraint, reservoir lower discharge limit and installation limit; and solving the runoff compensation adjustment calculation model.
In the uniform-output-step hydropower station/group runoff compensation adjustment calculation method, the solving steps of the runoff compensation adjustment calculation model are as follows:
Step 1: based on a difference curve of a hydropower group compensation total output process when the storage flow of the compensation power station is not regulated, the output oblique lines of average power generation and the like of hydropower group time periods are taken as trial-calculated variables, a storage capacity energy storage process is taken as a state variable, and the storage capacity of a reservoir is taken as constraint;
Step 2: correcting the trial-calculation variable and the state variable by combining the reservoir water level change to obtain an equal output time period and an equal output thereof;
step 3: then calculating time intervals in time sequence to obtain all the equal output segments and equal output of each segment;
Step 4: correspondingly calculating a flow regulation process, and compensating the power generation flow, the warehouse-in flow and the water discarding flow of the related power station;
Step 5: calculating the water level process, the water head process, the power generation output and the expected output of the reservoirs of each power station;
Step 1 to step5 are a complete calculation process.
In the above-mentioned uniform-output-step hydropower station/group runoff compensation adjustment calculation method, the step of solving the runoff compensation adjustment calculation model further includes:
Step 6: judging the uniformity degree of the output process according to the calculation result in the step 5, and further determining whether rechecking calculation is needed;
step 7: if the rechecking calculation is needed, correcting the difference curve and the reservoir energy storage capacity, and carrying out the rechecking calculation of the steps 1-5.
In the above-mentioned uniform-output-step hydropower station/group runoff compensation adjustment calculation method, the objective function is:
（1）
Wherein: f represents the maximum power generation amount of the hydropower station/group, F represents the minimum value of the square of the power difference of adjacent time periods of the hydropower station/group, i represents the ith hydropower station, and j represents the jth time period; n represents the number of hydropower stations participating in compensation adjustment calculation; s i,j represents the compensation total output of the ith hydropower station in the jth period.
In the above calculation method for compensating and adjusting the uniform-output cascade hydropower station/group runoff, the water balance equation is as follows:
（2）
Wherein: w i,j represents the water storage capacity of the ith hydropower station in the jth period, Q i,j represents the inflow of the ith hydropower station in the jth period, Q i,j represents the outflow of the ith hydropower station in the jth period, Q qi,j represents the buckling loss flow of the ith hydropower station in the jth period, and T represents the time step.
In the calculation method for compensating and adjusting the uniform-output cascade hydropower station/group runoff, the reservoir water storage capacity constraint is as follows:
（3）
Representing the minimum storage capacity of the ith hydropower station, Representing the maximum storage capacity of the ith hydropower station.
In the above calculation method for compensating and adjusting the uniform-output cascade hydropower station/group runoff, the reservoir discharge limit is as follows:
（4）
Representing the minimum downflow for comprehensive utilization downstream of the ith hydropower station.
In the above-mentioned uniform-output-step hydropower station/group runoff compensation adjustment calculation method, the installation limit is:
（5）
N i,j represents the power generation output of the ith hydropower station in the jth period, The installed capacity of the ith hydropower station is represented, and the power generation output of each hydropower station is not larger than the expected installed output.
The beneficial effects are that: the invention can more conveniently calculate and obtain the adjustment output of the hydropower station group and the power generation output of each cascade hydropower station/group through a small number of times of full series iteration; in the calculation, the length of the adjusting period in the high water period and the low water period, the adjusting output and the like can be automatically solved, so that the calculation speed is increased, and the calculation precision is improved. According to the same data sequence, under the condition of meeting the same precision, the traditional dichotomy is adopted, and the iteration is required to be performed hundreds of times, but the iteration number is not more than 20, so that the iteration number is greatly reduced.
Under the condition of high-scale grid connection of the novel power system and large-scale new energy, the invention not only can ensure to improve the new energy consumption level, but also can adapt to the requirement of the uncertainty output of the new energy on the power grid regulation capability. On the basis of the traditional hydropower station/group runoff compensation adjustment, the invention fully considers the requirements of the power grid and new energy, and the objective function and the corresponding solving method thereof effectively meet the uniformity of output distribution.
The compensated output form has the characteristic of diversification, and the objective function of the compensation output form not only considers the new energy consumption level, but also does not influence the compensation adjustment calculation of the hydropower station.
In the invention, the improved iterative solving method based on the difference product curve can further improve the convergence efficiency. The difference product curve method is that the difference product curve of rainfall is often utilized to analyze the uniformity degree of the annual rainfall process in hydrology statistics, the output difference product curve is similar to the difference product curve of rainfall, the increase and decrease of output can be rapidly obtained by judging the trend (increase/decrease) of the output difference product curve, namely, when the output difference is a negative value, the output is increased, otherwise, the output is decreased, the search path is clear, the target is clear, and the non-target search and convergence path of the pure mathematical concept in the conventional method are avoided.
The invention is suitable for complex power grids, energy bases and hydropower stations/groups containing hydropower, in particular relates to a cascade hydropower station/group runoff compensation adjustment calculation method aiming at keeping the adjustment capability of the hydropower station and promoting the grid-connected wind power and photovoltaic power generation and consumption, and can provide basic support and reference for power supply configuration planning, power supply design, multi-energy complementary operation scheduling and management of the power grid.
The hydropower station/group uniform output compensation adjustment calculation method is beneficial to the consumption of high-proportion new energy: the core goal of the power system multi-energy complementation is to satisfy the balance of load demand and power supply multi-time level. The hydropower is an important regulating power supply for eliminating new energy of the power grid, and for high-proportion new energy grid connection, the power system can eliminate the new energy by means of thermal power regulation, wind-solar reasonable power discarding, system load coupling, power mutual power balance among power grids, daily regulation of pumping, storage and energy storage and the like, and the power system can realize power and electricity quantity (and peak regulation) balance of the power system by gradually advancing and complementing multiple functions in a layered manner. The hydropower station/group can uniformly output the gradient power generation in the self-flow area to 'turn over and turn over' to provide a foundation for the multi-energy complementation of the system so as to be used for high-proportion new energy consumption.
The invention is visual and easy to realize, and accords with the development trend of the power grid: the invention combines the demand characteristics of the novel power system, considers the full utilization of hydraulic resources, the improvement of output in the dead period and the alleviation of sudden increase of output in the flood period, carries out runoff compensation adjustment calculation in a uniform output mode, and gives up space for the centralized and oversized output of new energy output, which is visual and easy to realize.
The compensation benefit of the invention is remarkable: the adjustment performance of each level of hydropower stations in the cascade hydropower stations/groups is different, the hydrologic conditions are different, and each hydropower station can be divided into a compensation power station and a compensated power station by combining the adjustment capability, the hydrologic runoff relation and the like. Calculating the flow of the compensated power station and the intermediate power generation result, and then gradually utilizing the compensation power station to perform compensation calculation, so that the integral power generation of the hydropower station/group achieves the effects of maximum output in the dead period, minimum output sudden increase change in the flood period and most sufficient water yield power generation utilization, and a long-series long-term time-level power generation dispatching result with uniform output process, reasonable power generation and full coordination among steps is obtained.
Drawings
FIG. 1 is a schematic diagram of a hydropower station/group runoff compensation adjustment improvement solution algorithm;
FIG. 2 is a flow chart of a runoff compensation adjustment calculation;
figure 3 is a graph of flood peak hydropower station water level, average monthly output and total step output process (typical segment).
Detailed Description
Example 1. Runoff regulation of hydropower in a long-term time layer of a large-area (trans-regional trans-province) system is focused on the demand balance characteristics of an electric power system, starts to conduct hydropower cascade compensation, fully plays roles of electric quantity and capacity of hydropower, and mainly regulates and controls the hydropower season and the non-flood season. The reasonable runoff compensation scheduling mode of water and electricity can be summarized into 'fully utilizing hydraulic resources, improving output in dead time and slowing down output sudden increase in flood time'. And analyzing application scenes formed by different power systems and different power supplies, and combining factors in aspects of photovoltaic output characteristics, hydrologic runoff characteristics, hydropower adjustment capability and the like, wherein the specific flexible adjustment capability and extremely low operation cost of hydropower are always used as a first type of adjustment power supply of a power grid under the condition of high-proportion photovoltaic grid connection. In the long-term time layer, the water and electricity should improve the output in the dead period, especially the output at the dead end as much as possible, improve the complementary adjustment capability in the dead period, and cope with the influence of low output on the power grid in the continuous unfavorable weather of new energy; the electric quantity is uniformly distributed as much as possible in the flood season, so that the hydropower compensation capacity is improved, the daytime electric power space is vacated for compensating the photovoltaic, and the water and electricity discarding is reduced; so as to adapt to the safe operation of the power grid and improve the utilization rate of new energy consumption.
Along with the grid connection and the digestion of large-scale high-proportion new energy power generation, the regulation capability and the complementary characteristic of the regulating power supply are required to be fully exerted to improve the digestion level of the energy, meanwhile, in order to ensure the high-proportion large-scale digestion of the new energy, the hydropower station/group runoff regulating and calculating method is also required to be further researched, the support is provided for the planning and the design of the power supply, and meanwhile, the guidance is provided for the hydropower and the multifunctional complementary operation scheduling of the power grid.
Under the condition of high-scale grid connection of new energy sources in a novel power system, the new energy source consumption level is guaranteed to be improved, the requirement of the new energy source uncertainty output on the power grid adjustment capability is adapted, and the water and electricity adjustment capability is kept to become the key of hydropower station/group runoff compensation adjustment calculation. Based on the method, the invention provides a uniform-output-step hydropower station/group runoff compensation adjustment calculation method based on new energy consumption and the maintenance of the hydropower adjustment capability in a novel electric power system, the content of uniform output distribution is highlighted after the power grid and the new energy requirements are considered on the basis of the conventional hydropower station/group runoff compensation adjustment, a solving objective function and constraint conditions are provided to complete the construction of a runoff compensation adjustment calculation model, and the solving method of the runoff compensation adjustment calculation model is improved. Specifically:
(1) Objective function
The cascade hydropower station/group compensation adjustment needs to fully utilize hydraulic resources to ensure that the generated energy of the hydropower group and the average output in the dead water period are large, and when a power grid has high-proportion new energy, the adjustment effect and emergency effect of the hydropower output also need to be considered, so that the uniformity of the hydropower output needs to be considered. The objective function of the hydropower station/group runoff compensation adjustment is therefore that the hydropower station/group power generation amount is maximum, and the sum of squares of the power output differences in adjacent periods of the hydropower station/group is minimum.
The objective function is as follows:
（1）
Wherein: f represents the maximum power generation amount of the hydropower station/group, F represents the minimum value of the square of the power generation difference of the hydropower station/group in adjacent time periods, Represent the firstThe power station of the utility model is provided with a power station,Represent the firstA time period; n represents the number of hydropower stations participating in compensation adjustment calculation; Represent the first The time interval i is the total power of the hydropower station, wherein the compensated power can comprise the power of hydropower, new energy and the like.
(2) Constraint conditions
1) Equation of water balance
（2）
In the method, in the process of the invention,Represent the firstThe water storage capacity of the ith hydropower station in the period; Represent the first Inflow of the time interval i-th hydropower station; Represent the first The outflow of the ith hydropower station in the period comprises the power generation flow and the waste water flow; Represent the first The deduction flow of the ith hydropower station in the period; Representing the step size in month, ten days, etc.
2) Reservoir water storage capacity constraint
（3）
Representing the minimum storage capacity, typically dead storage capacity, of the ith hydropower station; the maximum storage capacity of the ith hydropower station is indicated, which generally refers to the storage capacity corresponding to the normal water storage level, and the flood season is the flood control limit storage capacity.
3) Reservoir under-discharge limit
（4）
Representing the minimum downflow for comprehensive utilization downstream of the ith hydropower station.
4) Machine restraint
（5）
N i,j represents the power generation output of the ith hydropower station in the jth period,Representing the installed capacity of the i-th hydropower station. And the power generation output of each hydropower station is not larger than the expected output of the installation.
(3) Conventional runoff compensation adjustment calculation model solving method
The conventional trial algorithm is to calculate the total output process of the compensated power station when compensation adjustment is not considered, and adjust the flow and the water level on the dam; assuming a minimum output achieved by the total output of the steps in the water supply period after compensation by a compensation power stationMake compensation adjustment calculation time by time interval, the firstThe whole step output is at least equal to the output of the time-interval compensation power station when the leakage flow rate of the power station is q Tonifying device 。
（6）
（7）
（8）
Wherein: to compensate the output coefficient of the power station, The output coefficient of the compensated power station; To compensate the water head of the power station, A head of the compensated power station;、 Respectively the first of the compensating power stations Initial and final reservoir capacities of the time period;、 the ith hydropower station respectively compensated Initial and final reservoir capacities of the time period; F i(qi) are respectively a water level reservoir capacity curve of the compensated power station and a water level flow relation curve at the plant site of the compensated power station; q Tonifying device 、qi is the bleed flow of the compensating power station and the compensated power station respectively; f Tonifying device (W Tonifying device ,j-i)、f Tonifying device (W Tonifying device ,j) respectively compensating water level reservoir capacity curves of the power station in the period beginning and the period end of the j-th period; f Tonifying device (q Tonifying device ) is a water level flow relation curve at the plant site of the compensating power station, n is the total number of the power stations, and n Tonifying device is the number of the compensating power stations.
According to the assumptionPerforming compensation adjustment calculation of the whole step, wherein the compensated output exceedsWhen the water level of the compensating power station is lower than the dead water level, the compensating power station is not needed to compensate, the water level is calculated to be at the end of the dead water sectionToo large, or too small, assuming again by dichotomyThe calculation is repeated until the accuracy requirement is met.
(4) Improved solving method of the invention
The invention improves and solves the trial algorithm: firstly, the influence of uncertainty in a full-scale period, node and uncertainty in output of equal output period and the like is considered, and secondly, the trial calculation method of simplifying period and output of equal output is considered, so that the calculation precision is improved, and the convenience of an energy difference product curve is utilized. The main solving steps are as follows:
① The method is characterized by taking a difference product curve of a hydropower group compensation total output process when the storage flow of a compensation power station is not regulated as a basis, taking output oblique lines such as average power generation of hydropower groups in a period of time as a trial-calculation variable, taking a storage capacity energy storage process as a state variable and taking storage energy storage capacity of a reservoir as a constraint.
② And correcting the trial-calculation variable and the state variable by combining the change of the reservoir water level to obtain an equal output time period and an equal output thereof.
③ And then calculating time intervals in time sequence to obtain all the equal-output segments and the equal-output of each segment.
④ Correspondingly calculating the flow regulating process, and compensating the power generation flow, the warehouse-in flow, the water discarding flow and the like of the related power station.
⑤ The water level process, the water head process, the power generation output, the expected output and the like of the power station reservoirs are calculated, and the whole calculation process is adopted from the steps 1 to 5.
⑥ And determining whether rechecking calculation is needed according to the uniformity degree ⑤.
⑦ If the rechecking calculation is needed, correcting the difference product curve, the storage capacity, and the like, and carrying out the rechecking calculation of ①～⑤.
The adjustment output of the hydropower station and the power generation output of each step power station can be obtained through calculation conveniently through a small number of full series of iterations; in the calculation, the length of the adjusting period in the high water period and the low water period, the adjusting output and the like can be automatically solved, so that the calculation speed is increased, and the calculation precision is improved. A brief principle of the improvement of the present invention is shown in fig. 1. In fig. 1, V Warehouse energy storage represents the capacity of the reservoir to adjust the reservoir volume corresponding to the available head for this compensation. N Force of enlarging 、N Output of dead out represents the output of the full water and dead water adjusting section of all steps in each month; the force value is equal to the energy average of the slope extension series of the line segment.
The runoff compensation adjustment calculation model adopted by the invention fully considers the universality of water and electricity group combination, is not only suitable for serial cascade compensation adjustment of a single river channel, but also suitable for cascade compensation adjustment of a series-parallel connection, and can cover the compensation adjustment of rivery-flow cascade power stations without hydraulic connection. The calculation model is suitable for each stage of planning and design, not only can carry out full-automatic uniform output compensation, but also can be used for adding human intervention 'scheduling diagram' compensation calculation; its "schedule" compensation calculation is also one of the extensions of the invention.
In summary, the invention provides a uniform output compensation mode for a power system or an energy base with hydropower when large-scale new energy is consumed in a high proportion under the background of a novel power system, so that the hydropower cascade adjustment function and the electric power and electric quantity function are fully exerted, the new energy consumption level is improved, and the uniform output compensation mode is provided. Compared with the traditional or conventional method, the compensation method is mainly embodied on an objective function and a solution iteration method. The method for calculating the uniform output step hydropower station/group runoff compensation adjustment based on new energy consumption and the maintenance of the hydropower adjustment capability in the novel electric power system is provided, and is shown in fig. 2.
Example 2. In order to more clearly understand the objects, features and advantages of the present invention, the following description will further explain the technical solution of the present invention by taking the analysis of the hydropower steps in the Guizhou Wujiang river as an example with reference to fig. 1 to 3.
(1) Step profile of Wujiang hydropower
The Wujiang has built 11-level hydropower station, has built total assembly machine 1110.9 kW, has electric quantity 392 hundred million kWh in year, and has 96% of development utilization rate. The 9-level total assembly machine in Guizhou in Wujiang has the size of 875.9 kilowatts, accounts for 45 percent of the development amount of the full-power-saving water and electricity technology, accounts for 52 percent of the water and electricity installation of the power supply Guizhou, accounts for 67 percent of the peak regulation water and electricity of the Guizhou, is a main peak regulation power supply of the Guizhou power grid and the Chongqing power grid, plays a role in the power system of Guizhou, and makes an important contribution to energy conservation, emission reduction, energy structure adjustment and new energy consumption promotion. The total adjustment reservoir capacity of the 9-step hydropower station with the Ujiang main flow is 95.092 hundred million m 3, the step adjustment performance is good as a whole, the hydropower station with the adjustment performance for many years has flood and beach formation, the hydropower station with the adjustment performance for four seasons has Puding, starter, east wind and Ujiang, and the hydropower station with the adjustment performance for the day (week) has the cableway, the cislin, the sand tuo, the large-flower water and the Gri bridge. The flood peak hydropower station is used for adjusting the reservoir capacity to 33.6 hundred million m 3, is a step controlled reservoir project, and the beach power station is used for adjusting the reservoir capacity to 29.0 hundred million m 3, so that the compensation and adjustment effects on the whole steps are remarkable.
(2) Runoff condition of hydropower station
① Distribution law in runoff year
The annual allocation of the runoff in the river basin is basically corresponding to precipitation. From the annual distribution of the runoff of each step of the dam site in Wujiang, the average runoff of 5-10 months for years accounts for about 80% of the annual runoff, and the average runoff of 11-4 months for the next year accounts for about 20%; the most abundant water month is 7 months except that the downstream cislin and sand Tuo hydropower station is 6 months, and the most abundant water month accounts for 19.3-22.7%; the most withered water month upstream water power station is 3 months, the most withered water month downstream water power station is 2 months, and the most withered water month accounts for 1.45-2.74%.
② Periodic variation law of runoff
And the runoff of each step of dam site of the Wujiang enters the flood season from 5 months in 1951, the process trend of each step of runoff is better in consistency, and after 2000 years, the process trend of the runoff of each step of dam site of the hydropower station is more consistent, and the continuous water-withering section is experienced, in particular to the special water-withering year in 2011. With the increase of the control water collecting area, the runoff and the withered variation amplitude of each step dam site show a certain difference. The runoff and the withered change of each cascade hydropower station is a gradual change process from the upstream to the downstream, a cable camp and a river crossing region, a river crossing and a beach forming region are transition regions, and the regions below the beach forming hydropower station are greatly different from the upstream, so that the relevance and the difference of climate on a river basin are shown.
(3) Calculation result
By adopting the long-series runoff regulation calculation of the invention, the average output of the Wujiang cascade power station for many years is 329.5 kW, the average output of the Wujiang cascade power station for the flood period is 379.6 kW, the output of the Wujiang cascade power station for the dead water period is 273.6 kW, the ratio of the abundant output to the output of the Wujiang cascade power station is 1.39, and the annual utilization hours is 3169h. The reservoir water level, average output process and total output process of the hydroelectric steps of a typical Duan Honggu-th hydroelectric power station are shown in tables 1,2 and fig. 3. The achievement shows that: after the invention is adopted to carry out long-series runoff regulation calculation, the target output is most uniform and the water quantity is fully utilized after the control factors are considered, so that more stable regulation performance is provided for new energy consumption, and the invention is beneficial to the consumption of uncertain new energy output.
TABLE 1 Wujiang ladder long series runoff regulating output characteristics
| Project | Index (I) |
| Installation (ten thousands kW) | 910.9 |
| Annual average output (ten thousands kW) | 329.52 |
| Average output (ten thousands kW) during flood season (5-10 months) | 379.55 |
| Average output (ten thousands kW) during non-flood period (11-4 months) | 273.55 |
| Ensuring output (ten thousands kW, P=95%) | 235.65 |
| Design dead water section average output (ten thousands kW) | 235.65 |
| Ratio of abundant output | 1.39 |
| Capacity/guaranteed output | 3.87 |
| Annual energy (Yi kWh) | 288.67 |
| Annual usage hours (h) | 3169 |
TABLE 2 Water level, average output per month and total output per step of the flood Jiadu hydropower station (typical section)
。
Claims (6)
1. A uniform power-output cascade hydropower station/group runoff compensation adjustment calculation method is characterized in that an objective function is constructed based on the principle that the generating capacity of a hydropower station/group is maximum and the square sum of power-output differences in adjacent time periods of the hydropower station/group is minimum; setting constraint conditions of an objective function to complete construction of a runoff compensation adjustment calculation model, wherein the constraint conditions comprise a water quantity balance equation, reservoir water storage capacity constraint, reservoir lower discharge limit and installation limit; solving the runoff compensation adjustment calculation model; the solving steps of the runoff compensation adjustment calculation model are as follows:
Step 1: based on a difference curve of a hydropower group compensation total output process when the storage flow of the compensation power station is not regulated, the output oblique lines of average power generation and the like of hydropower group time periods are taken as trial-calculated variables, a storage capacity energy storage process is taken as a state variable, and the storage capacity of a reservoir is taken as constraint;
Step 2: correcting the trial-calculation variable and the state variable by combining the reservoir water level change to obtain an equal output time period and an equal output thereof;
step 3: calculating time intervals in time sequence to obtain all series of equal-output segments and equal-output of each segment;
Step 4: correspondingly calculating a flow regulation process, and compensating the power generation flow, the warehouse-in flow and the water discarding flow of the related power station;
Step 5: calculating the water level process, the water head process, the power generation output and the expected output of the reservoirs of each power station;
Step 6: judging the uniformity degree of the output process according to the calculation result in the step 5, and further determining whether rechecking calculation is needed;
step 7: if the rechecking calculation is needed, correcting the difference curve and the reservoir energy storage capacity, and carrying out the rechecking calculation of the steps 1-5.
2. The method for calculating the uniform output cascade hydropower station/group runoff compensation adjustment according to claim 1, wherein the objective function is as follows:
（1）；
Wherein: f represents the maximum power generation amount of the hydropower station/group, F represents the minimum value of the square of the power difference of adjacent time periods of the hydropower station/group, i represents the ith hydropower station, and j represents the jth time period; n represents the number of hydropower stations participating in compensation adjustment calculation; s i,j represents the compensation total output of the ith hydropower station in the jth period.
3. The method for calculating the uniform-output-step hydropower station/group runoff compensation adjustment according to claim 1, wherein the water balance equation is as follows:
（2）；
Wherein: w i,j represents the water storage capacity of the ith hydropower station in the jth period, Q i,j represents the inflow of the ith hydropower station in the jth period, Q i,j represents the outflow of the ith hydropower station in the jth period, Q qi,j represents the buckling loss flow of the ith hydropower station in the jth period, and T represents the time step.
4. The method for calculating the compensation adjustment of the uniform-output cascade hydropower station/group runoff according to claim 1, wherein the reservoir water storage capacity constraint is as follows:
（3）；
representing the minimum storage capacity of the ith hydropower station,/> Representing the maximum storage capacity of the ith hydropower station.
5. The method for calculating the compensation adjustment of the uniform-output-step hydropower station/group runoff according to claim 1, wherein the reservoir underrun load is limited to:
（4）；
Representing the minimum downflow for comprehensive utilization downstream of the ith hydropower station.
6. The method for calculating the uniform output step hydropower station/group runoff compensation adjustment according to claim 1, wherein the installation limit is as follows:
（5）；
N i,j represents the power generation output of the ith hydropower station in the jth period, The installed capacity of the ith hydropower station is represented, and the power generation output of each hydropower station is not larger than the expected installed output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410462435.1A CN118069957B (en) | 2024-04-17 | 2024-04-17 | Uniform-output-step hydropower station/group runoff compensation adjustment calculation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410462435.1A CN118069957B (en) | 2024-04-17 | 2024-04-17 | Uniform-output-step hydropower station/group runoff compensation adjustment calculation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118069957A true CN118069957A (en) | 2024-05-24 |
| CN118069957B CN118069957B (en) | 2024-06-28 |
Family
ID=91106169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410462435.1A Active CN118069957B (en) | 2024-04-17 | 2024-04-17 | Uniform-output-step hydropower station/group runoff compensation adjustment calculation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118069957B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111652472A (en) * | 2020-05-07 | 2020-09-11 | 贵州乌江水电开发有限责任公司洪家渡发电厂 | Method for solving compensation benefits of watershed cascade hydropower station group and distributing benefits |
| CN117610828A (en) * | 2023-11-21 | 2024-02-27 | 中国长江电力股份有限公司 | Step-size dense-by-dense multi-target cascade hydropower station group optimal scheduling method |
-
2024
- 2024-04-17 CN CN202410462435.1A patent/CN118069957B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111652472A (en) * | 2020-05-07 | 2020-09-11 | 贵州乌江水电开发有限责任公司洪家渡发电厂 | Method for solving compensation benefits of watershed cascade hydropower station group and distributing benefits |
| CN117610828A (en) * | 2023-11-21 | 2024-02-27 | 中国长江电力股份有限公司 | Step-size dense-by-dense multi-target cascade hydropower station group optimal scheduling method |
Non-Patent Citations (1)
| Title |
|---|
| 缪益平, 黄海涛, 纪昌明, 王丽萍: "径流补偿时梯级水电站群系统保证出力的计算模型", 水电能源科学, no. 01, 30 March 2004 (2004-03-30), pages 33 - 36 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118069957B (en) | 2024-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2023065113A1 (en) | Flexibility demand quantification and coordination optimization method for wind-solar-water multi-energy complementary system | |
| Ding et al. | A forecast-driven decision-making model for long-term operation of a hydro-wind-photovoltaic hybrid system | |
| WO2019006733A1 (en) | Long-term joint peak regulation dispatching method for trans-provincial interconnected hydropower station cluster | |
| CN106786799B (en) | Power stepped power generation plan optimization method for direct current connecting line | |
| CN110829408B (en) | Multi-domain scheduling method considering energy storage power system based on power generation cost constraint | |
| CN111092451B (en) | Photovoltaic consumption early warning method based on power distribution network grid | |
| CN111030189A (en) | Wind power and photovoltaic consumption prediction and early warning method | |
| CN109726907A (en) | Long-term output calculation method and system in a kind of GROUP OF HYDROPOWER STATIONS | |
| CN116667395A (en) | Capacity allocation method for water-wind-solar-energy-storage complementary pump station based on cascade hydropower transformation | |
| CN113285483B (en) | Photovoltaic consumption rate calculation method based on water-light intra-day complementation of clean energy base | |
| Orzikul | Potential and Opportunities of the Use of Renewable Energy Sources in Uzbekistan | |
| CN118069957B (en) | Uniform-output-step hydropower station/group runoff compensation adjustment calculation method | |
| CN116780508A (en) | Multi-uncertainty-based gradient hydropower-photovoltaic complementary system medium-long term interval optimal scheduling method | |
| CN108718093B (en) | Active-reactive coordination control method for high energy-carrying load participating in wind power consumption | |
| CN110826778A (en) | Load characteristic optimization calculation method actively adapting to new energy development | |
| CN116245680A (en) | Photovoltaic absorption rate calculation method based on complementation in water, light and month of clean energy base | |
| Li et al. | Optimal scheduling model of hydro-photovoltaic complementary based on simulation optimization algorithm | |
| Liu et al. | Research on consumptive capacity and countermeasures of renewable energy of central Tibet | |
| Qian et al. | Research on source-load coordinated dispatch based on multi-scenario wind power consumption | |
| Zhang et al. | Research on economic competitiveness of centralized and distributed wind and solar power | |
| Kustov | Modern potential and economic opportunities of managing alternative energy sources | |
| Ma et al. | Multi-objective optimal scheduling of power system considering the coordinated operation of photovoltaic-wind-pumped storage hybrid power | |
| Lu et al. | Research on the capacity allocation of basin hydropower-photovoltaic-storage hybrid power generation system based on flexibility of hydropower and pumped storage power stations | |
| Zhang et al. | Research on clean energy complementary power generation and optimal operation in Yalong river basin | |
| Cui et al. | An Optimization Method Based on Time-Sharing Energy Complementation to Determine Transmission Capacity of Wind-CSP Plants Combined System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |