A short-term optimal dispatching method and system for cascade reservoirs based on equal storage capacity lines

Abstract

The present invention provides a short-term optimization scheduling method and system for a cascade reservoir group based on an equal storage capacity line, which realizes the maximum total power generation benefit of the cascade under the premise of meeting the flood control safety of the basin, and at the same time improves the calculation efficiency of the short-term optimization scheduling of the cascade reservoir group. In view of the dynamic change characteristics of the flood control storage capacity required by the cascade reservoir group in different scheduling periods, a short-term optimization scheduling model for the cascade reservoir group based on the equal storage capacity line is constructed, and it is quickly solved in combination with methods such as dynamic programming. First, the equal storage capacity line is introduced to perform a preliminary screening of the operating water level combination for the cascade reservoir group, and then based on the water level combination that meets the requirements of the reserved flood control storage capacity, an optimization algorithm is used to determine the optimal water level combination at different time nodes in the scheduling period to ensure the maximum overall power generation benefit of the cascade. The present invention can quickly solve the operating water level process of the cascade reservoir group on the premise of meeting the flood control storage capacity required for flood control safety in the basin, and realize the maximum overall power generation benefit of the cascade.

Description

Technical Field

[0001] The present invention relates to the technical field of reservoir forecasting and dispatching, and in particular to a short-term optimization dispatching method and system for a cascade reservoir group based on an equal storage capacity line. Background Art

[0002] With the completion and commissioning of giant reservoirs such as Wudongde and Baihetan, the available flood control storage capacity of the upper reaches of the Yangtze River, with the Three Gorges as the core reservoir group, has further increased. While the overall flood control capacity of the basin has been significantly improved, the flood control pattern has also changed significantly, and the flood control tasks and roles of the main and tributary reservoir groups have changed accordingly. One of the prominent problems that arises is that when facing the same flood protection objects and requiring the same flood control storage capacity, the composition and scheduling space of the available reservoirs upstream have changed significantly. How to achieve the optimal scheduling process of the upstream cascade reservoir group and maximize the overall power generation benefits of the cascade while ensuring flood control safety is an urgent problem that needs to be solved.

[0003] Taking the flood control protection objects of the Sichuan-Chongqing river section as an example, before the Wudongde and Baihetan reservoirs were put into operation, the flood control task of the Sichuan-Chongqing river section was mainly undertaken by the Xiluodu and Xiangjiaba reservoirs. The completion and commissioning of the Wudongde and Baihetan reservoirs increased the flood control capacity by nearly 10 billion m 3 The flood control storage capacity is much larger than the flood control storage capacity reserved by Xiluodu and Xiangjiaba reservoirs for the Sichuan-Chongqing river section. It is clearly stipulated that the flood control task of the Sichuan-Chongqing river section is mainly undertaken by the cascade reservoirs in the lower reaches of the Jinsha River. The adjustment of the flood control task directly affects the dispatching and operation mode of the cascade reservoir group in the lower reaches of the Jinsha River. It is necessary to optimize the operation process of the four reservoirs of Wudongde Baihetan-Xiluodu-Xiangjiaba on the premise of ensuring the completion of the flood control task of the Sichuan-Chongqing river section, so as to maximize the benefits of cascade power generation.

[0004] Such problems exist not only in the upper reaches of the Yangtze River, the middle reaches of the Jinsha River, the Yalong River, the Min River, the Jialing River, the Wujiang River and other tributaries, but also in the upper reaches of the Han River and other basins.

[0005] For such problems, the solution generally adopted by the common optimization scheduling method is to discretize the water level operation interval of each reservoir according to a certain calculation step, and select the optimal water level combination that meets the constraints such as the total reserved flood control storage capacity through enumeration and sampling tests, so as to maximize the total power generation benefit of the cascade. The problem with this idea is that as the number of cascade reservoirs involved in the calculation continues to increase, the number of water level combinations increases exponentially, the number of calculations and calculation time to obtain the optimal solution increases significantly, and the calculation efficiency is obviously low.

[0006] Therefore, exploring a better solution method to obtain the optimal water level combination more quickly and maximize the total cascade power generation efficiency while ensuring flood control safety and meeting the total reserved flood control reservoir capacity conditions is a key problem that needs to be urgently solved in the field of real-time forecasting and scheduling of reservoirs. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a short-term optimal scheduling method and system for a cascade reservoir group based on an equal storage capacity line. On the premise of meeting the flood control storage capacity required for flood control safety in the basin, the operating water level process of the cascade reservoir group can be quickly solved to maximize the overall power generation benefit of the cascade.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] The present invention provides a short-term optimization scheduling method for a cascade reservoir group based on an equal storage capacity line, comprising:

[0010] S1. The study area is divided into two parts according to the water system composition, which are respectively , delineate the sub-basins and reservoir groups of each sub-region, and divide each sub-basin reservoir group into one group;

[0011] S2. Calculation of the isocapacity line of the sub-basin reservoir group: The water level of each reservoir in the discrete sub-basin is calculated as The first reservoir in the sub-district For example, suppose The first reservoir in the sub-district The dead water level is , the normal high water level is , according to the step length of 0.1m, from the dead water level to the normal high water level, each discrete point is recorded as ,in, , is the total number of discrete points, and calculates the reservoir capacity corresponding to each water level , cross-combining the discrete results of water levels of all reservoirs in the sub-basin, and determining the corresponding relationship between different water level combinations of reservoir groups in the sub-basin and the total storage capacity;

[0012] Assume that each type of water level combination corresponding to the same total storage capacity value Recorded as the water level of the first-level virtual reservoir ,in, Indicates that the same total storage capacity value is met of The water level value of the Mth reservoir in the partition, all corresponding relationships will form a relationship line between the virtual reservoir water level and the total storage capacity of the sub-basin reservoir group. Under the same storage capacity value, the line formed by all water level combinations is an equal storage capacity line of the sub-basin reservoir group under the corresponding storage capacity value. , all equal storage capacity lines form the equal storage capacity lines of the corresponding sub-basin reservoir groups;

[0013] S3. Calculation of equal storage capacity lines of sub-district reservoir groups: The water level combination and total storage capacity value corresponding to the equal storage capacity line of each sub-district sub-basin are equivalent to a secondary virtual reservoir. The different virtual reservoir combinations of the sub-districts and the total storage capacity value of the sub-district reservoir group form the equal storage capacity line of the sub-district reservoir group, that is, the total storage capacity value of each sub-district reservoir group corresponds to the water level combination of one or more sub-district sub-basin reservoir groups;

[0014] S4. Calculation of equal storage capacity lines in the study area: The water level combination and total storage capacity value corresponding to the equal storage capacity lines in the study area are equivalent to a three-level virtual reservoir. Then the different virtual reservoir combinations in the study area and the total storage capacity value of the sub-district reservoir group form the equal storage capacity line of the reservoir group in the study area, that is, the total storage capacity value of any reservoir group in the study area corresponds to the water level combination of one or more sub-district reservoir groups, and then corresponds to the water level combination of one or more sub-district sub-basin reservoir groups;

[0015] S5. Obtaining the water level combination of the cascade reservoir group under a certain storage capacity value: according to the calculation results of the equal storage capacity lines of the sub-basin, sub-region and study area, obtain the water level combination of the cascade reservoir group under a certain total storage capacity value of the study area, that is, obtain the water level combination of the reservoir group corresponding to the virtual reservoir water level step by step, and connect them in series with the upstream and downstream relationship to form the water level combination of the cascade reservoir group under the total storage capacity value of the study area;

[0016] S6, obtaining water level combinations of cascade reservoirs under different storage capacity values: according to S5, obtaining water level combinations of cascade reservoirs under different storage capacity values;

[0017] S7. Construct a short-term optimal dispatching model for cascade reservoirs: clarify dispatching objectives and constraints, determine the reserved flood control storage capacity of the cascade reservoirs according to the dispatching cycle and dispatching step, and construct a short-term optimal dispatching model for the cascade reservoirs;

[0018] S8. Determine the daily, seasonal and ten-day calculation periods according to the dispatching requirements and runoff data;

[0019] S9, hierarchical optimization calculation: hierarchical calculation satisfies the water level combination of each reservoir under the condition of a reserved flood control storage capacity, and the optimal combination is solved by the dynamic programming optimization algorithm, which is the optimal solution of the model;

[0020] S10. After the calculation is completed, the water level operation process of each reservoir is output, which is the optimization result.

[0021] Furthermore, the sub-basin reservoir group in S1 refers to all reservoirs included in the calculation of equal storage capacity, all of which are sub-basin controlling reservoirs, that is, large and medium-sized reservoirs with certain regulating capabilities. Other run-of-river reservoirs with small regulating capabilities or even no regulating capabilities are controlled according to the reservoir balance after the starting water level is specified, and do not participate in the calculation of total storage capacity.

[0022] Furthermore, in S2, each type of water level combination with the same total storage capacity value is sorted from small to large or from large to small in accordance with the upstream and downstream relationship of the reservoir group, starting from the first-level reservoir, when forming the water level of the virtual reservoir.

[0023] Furthermore, the isocapacity line in S2 is a curve in plane coordinates if the number of sub-basin reservoir groups is 2; if the number of sub-basin reservoir groups is 3, the isocapacity line is extended to a surface in three-dimensional Euclidean space; if the number of sub-basin reservoir groups is , then the equal storage capacity line is extended to Hyperplane in dimensional space coordinates.

[0024] Furthermore, in S7, the short-term optimal dispatching model of the cascade reservoir group is specifically:

[0025] S701. Objective function: Cascade reservoir group power generation is maximized:

[0026] ;

[0027] in, To participate in the calculation of the total power generation of the power station during the dispatch period, ; is the number of reservoirs; is the reservoir number, ; is the number of time periods in the scheduling period; is the time period number, ; For the reservoir In the period of efforts, ; For the period The number of hours, ;

[0028] S702, Constraints:

[0029] Cascade reserved flood control storage capacity requirements: Ensure that the total flood control storage capacity of the cascade reservoir group in each period during the dispatch period is not less than the target value:

[0030] ;

[0031] in, For the reservoir In the period of reserved flood control storage capacity, ; For the period The total flood control storage capacity that needs to be reserved is ;

[0032] Water balance equation: It is the balance relationship between the inflow and outflow of water in a single reservoir in time and in the space of a cascade reservoir group. Specifically:

[0033] ;

[0034] ;

[0035] in, For the reservoir In the period The total inbound flow, ; , , Reservoirs In the period The power generation flow, interval flow and abandoned water flow, ; For the reservoir No. directly upstream reservoir; For the reservoir The set of all directly upstream reservoirs;

[0036] The water level, power generation flow, outflow flow and output constraints are:

[0037] ;

[0038] in, For the reservoir The initial water level during the scheduling period is ; For the reservoir The starting water level, ; For the reservoir In the period The water level, ; Reservoirs In the period The upper and lower limits of water level; Reservoirs In the period The upper limit and lower limit of power generation flow; For the reservoir In the period Outbound flow, ; Reservoirs In the period The upper and lower limits of outbound flow; For the reservoir In the period of efforts, ; Reservoirs In the period The output upper limit and the output lower limit.

[0039] Furthermore, a short-term optimization dispatching system for a cascade reservoir group based on an equal storage capacity line includes at least one processor; and at least one memory connected to the processor in communication, wherein:

[0040] The memory stores instructions that can be executed by the processor, and the instructions are used to be executed by the processor to implement the short-term optimization scheduling method of cascade reservoirs based on equal storage capacity lines.

[0041] The beneficial effects of the present invention are as follows: by introducing equal storage capacity lines, preliminary screening of operating water level combinations is performed for cascade reservoir groups, and then based on the water level combinations that meet the requirements of reserved flood control storage capacity, an optimization algorithm is used to determine the optimal water level combinations at different time nodes during the scheduling period, thereby ensuring the maximum overall power generation benefit of the cascade. The present invention can quickly solve the operating water level process of the cascade reservoir group on the premise of meeting the flood control storage capacity required for flood control safety in the basin, and achieve the maximum overall power generation benefit of the cascade, which is a practical and innovative method. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flowchart of the short-term optimal dispatching method of cascade reservoirs based on equal storage capacity lines;

[0043] Figure 2 It is a schematic diagram of the zoning composition structure of the cascade reservoir group in the middle reaches of the Jinsha River, the Yalong River and the lower reaches of the Jinsha River in the embodiment;

[0044] FIG3 (a) is a schematic diagram of the dispatching and operation process of the cascade reservoir group in the middle reaches of the Jinsha River - Liyuan Reservoir in the embodiment;

[0045] FIG3( b ) is a schematic diagram of the dispatching and operation process of the Jinsha River middle reaches cascade reservoir group - Ahai Reservoir in the embodiment;

[0046] FIG3 (c) is a schematic diagram of the dispatching and operation process of the Jinsha River middle reaches cascade reservoir group - Jinanqiao Reservoir in the embodiment;

[0047] FIG3 (d) is a schematic diagram of the dispatching and operation process of the Longkaikou Reservoir, a cascade reservoir group in the middle reaches of the Jinsha River in the embodiment;

[0048] FIG3 (e) is a schematic diagram of the dispatching and operation process of the Ludila Reservoir, a cascade reservoir group in the middle reaches of the Jinsha River in the embodiment;

[0049] FIG3 (f) is a schematic diagram of the dispatching and operation process of the Guanyinyan Reservoir, a cascade reservoir group in the middle reaches of the Jinsha River in the embodiment;

[0050] FIG4 (a) is a schematic diagram of the dispatching and operation process of the Yalong River cascade reservoir group - Lianghekou Reservoir in the embodiment;

[0051] FIG4( b ) is a schematic diagram of the dispatching and operation process of the Yalong River cascade reservoir group-Jinping I reservoir in the embodiment;

[0052] FIG4( c ) is a schematic diagram of the dispatching and operation process of the Yalong River cascade reservoir group-Ertan Reservoir in the embodiment;

[0053] FIG5 (a) is a schematic diagram of the dispatching and operation process of the Wudongde Reservoir, a cascade reservoir group on the lower reaches of the Jinsha River in the embodiment;

[0054] FIG5( b ) is a schematic diagram of the dispatching and operation process of the cascade reservoir group on the lower reaches of the Jinsha River - Baihetan Reservoir in the embodiment;

[0055] FIG5( c ) is a schematic diagram of the dispatching and operation process of the cascade reservoir group on the lower reaches of the Jinsha River - Xiluodu Reservoir in the embodiment;

[0056] FIG5( d ) is a schematic diagram of the dispatching and operation process of the Xiangjiaba Reservoir, a cascade reservoir group on the lower reaches of the Jinsha River in the embodiment. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] See also Figure 1 , a short-term optimal dispatching method for cascade reservoirs based on equal storage capacity lines, including:

[0059] S1. The study area is divided into two parts according to the water system composition, which are respectively , delineate the sub-basins and reservoir groups of each sub-region, and divide each sub-basin reservoir group into one group;

[0060] In a specific embodiment, for In terms of sub-basins, the sub-basins are denoted as: ,

[0061] That is, the reservoir group of the sub-basin is recorded as: ;

[0062] The sub-basin reservoir group in S1 refers to all reservoirs included in the calculation of equal storage capacity, all of which are sub-basin controlling reservoirs, that is, large and medium-sized reservoirs with certain regulating capabilities. Other run-of-river reservoirs with small or even no regulating capacity are controlled according to the inflow balance after the starting water level is specified, and do not participate in the calculation of total storage capacity.

[0063] S2. Calculation of the isocapacity line of the sub-basin reservoir group: The water level of each reservoir in the discrete sub-basin is calculated as The first reservoir in the sub-district For example, suppose The first reservoir in the sub-district The dead water level is , the normal high water level is , according to the step length of 0.1m, from the dead water level to the normal high water level, each discrete point is recorded as ,in, , is the total number of discrete points, and calculates the reservoir capacity corresponding to each water level , cross-combining the discrete results of water levels of all reservoirs in the sub-basin, and determining the corresponding relationship between different water level combinations of reservoir groups in the sub-basin and the total storage capacity;

[0064] Assume that each type of water level combination corresponding to the same total storage capacity value Recorded as the water level of the first-level virtual reservoir ,in, Indicates that the same total storage capacity value is met of The water level value of the Mth reservoir in the partition, all corresponding relationships will form a relationship line between the virtual reservoir water level and the total storage capacity of the sub-basin reservoir group. Under the same storage capacity value, the line formed by all water level combinations is an equal storage capacity line of the sub-basin reservoir group under the corresponding storage capacity value. , all equal storage capacity lines form the equal storage capacity lines of the corresponding sub-basin reservoir groups;

[0065] S3. Calculation of equal storage capacity lines of sub-district reservoir groups: The water level combination and total storage capacity value corresponding to the equal storage capacity line of each sub-district sub-basin are equivalent to a secondary virtual reservoir. The different virtual reservoir combinations of the sub-districts and the total storage capacity value of the sub-district reservoir group form the equal storage capacity line of the sub-district reservoir group, that is, the total storage capacity value of each sub-district reservoir group corresponds to the water level combination of one or more sub-district sub-basin reservoir groups;

[0066] S4. Calculation of equal storage capacity lines in the study area: The water level combination and total storage capacity value corresponding to the equal storage capacity lines in the study area are equivalent to a three-level virtual reservoir. Then the different virtual reservoir combinations in the study area and the total storage capacity value of the sub-district reservoir group form the equal storage capacity line of the reservoir group in the study area, that is, the total storage capacity value of any reservoir group in the study area corresponds to the water level combination of one or more sub-district reservoir groups, and then corresponds to the water level combination of one or more sub-district sub-basin reservoir groups;

[0067] S5. Obtaining the water level combination of the cascade reservoir group under a certain storage capacity value: according to the calculation results of the equal storage capacity lines of the sub-basin, sub-region and study area, obtain the water level combination of the cascade reservoir group under a certain total storage capacity value of the study area, that is, obtain the water level combination of the reservoir group corresponding to the virtual reservoir water level step by step, and connect them in series with the upstream and downstream relationship to form the water level combination of the cascade reservoir group under the total storage capacity value of the study area;

[0068] S6, obtaining water level combinations of cascade reservoirs under different storage capacity values: according to S5, obtaining water level combinations of cascade reservoirs under different storage capacity values;

[0069] S7. Construct a short-term optimal dispatching model for cascade reservoirs: clarify dispatching objectives and constraints, determine the reserved flood control storage capacity of the cascade reservoirs according to the dispatching cycle and dispatching step, and construct a short-term optimal dispatching model for the cascade reservoirs;

[0070] S8. Determine the daily, seasonal and ten-day calculation periods according to the dispatching requirements and runoff data;

[0071] In a specific implementation method, taking the daily step length as an example, the flood control storage capacity that needs to be reserved in the study area, sub-area, and sub-basin during the scheduling period and the allowed operating range of each reservoir are determined, and the discrete intervals and possible combinations of water levels in different time periods are determined by checking and calculating the equal storage capacity lines;

[0072] S9, hierarchical optimization calculation: hierarchical calculation satisfies the water level combination of each reservoir under the condition of a reserved flood control storage capacity, and the optimal combination is solved by the dynamic programming optimization algorithm, which is the optimal solution of the model;

[0073] S10. After the calculation is completed, the water level operation process of each reservoir is output, which is the optimization result.

[0074] In S2, each type of water level combination with the same total storage capacity value is sorted from small to large or from large to small according to the upstream and downstream relationship of the reservoir group, starting from the first-level reservoir, when forming the water level of the virtual reservoir, so as to better identify the points on the equal storage capacity line.

[0075] The isocapacity line in S2 is a curve in plane coordinates if the number of sub-basin reservoir groups is 2; if the number of sub-basin reservoir groups is 3, the isocapacity line is extended to a surface in three-dimensional Euclidean space; if the number of sub-basin reservoir groups is , then the equal storage capacity line is extended to Hyperplane in dimensional space coordinates.

[0076] In S7, the short-term optimal dispatching model of the cascade reservoir group is specifically:

[0077] S701. Objective function: Cascade reservoir group power generation is maximized:

[0078] ;

[0079] in, To participate in the calculation of the total power generation of the power station during the dispatch period, ; is the number of reservoirs; is the reservoir number, ; is the number of time periods in the scheduling period; is the time period number, ; For the reservoir In the period of efforts, ; For the period The number of hours, ;

[0080] S702, Constraints:

[0081] Cascade reserved flood control storage capacity requirements: Ensure that the total flood control storage capacity of the cascade reservoir group in each period during the dispatch period is not less than the target value:

[0082] ;

[0083] in, For the reservoir In the period of reserved flood control storage capacity, ; For the period The total flood control storage capacity that needs to be reserved is ;

[0084] Water balance equation: It is the balance relationship between the inflow and outflow of water in a single reservoir in time and in the space of a cascade reservoir group. Specifically:

[0085] ;

[0086]

[0087] in, For the reservoir In the period The total inbound flow, ; , , Reservoirs In the period The power generation flow, interval flow and abandoned water flow, ; For the reservoir No. directly upstream reservoir; For the reservoir The set of all directly upstream reservoirs;

[0088] The water level, power generation flow, outflow flow and output constraints are:

[0089] ;

[0090] in, For the reservoir The initial water level during the scheduling period is ; For the reservoir The starting water level, ; For the reservoir In the period The water level, ; Reservoirs In the period The upper and lower limits of water level; Reservoirs In the period The upper limit and lower limit of power generation flow; For the reservoir In the period Outbound flow, ; Reservoirs In the period The upper and lower limits of outbound flow; For the reservoir In the period of efforts, ; Reservoirs In the period The output upper limit and the output lower limit.

[0091] A short-term optimization dispatching system for a cascade reservoir group based on an equal storage capacity line comprises at least one processor; and at least one memory connected to the processor in communication, wherein:

[0092] The memory stores instructions that can be executed by the processor, and the instructions are used to be executed by the processor to implement a short-term optimization scheduling method for a cascade reservoir group based on equal storage capacity lines.

[0093] Example

[0094] Taking the cascade reservoir group system in the Jinsha River Basin in the upper reaches of the Yangtze River as an example, the calculation of the short-term optimal scheduling plan of the cascade reservoir group is carried out to verify the feasibility and effectiveness of the method of the present invention.

[0095] Figure 2A schematic diagram of the zoning composition of the cascade reservoir system in the Jinsha River Basin in the upper reaches of the Yangtze River was drawn, including three cascade reservoir groups in the middle reaches of the Jinsha River, the Yalong River and the lower reaches of the Jinsha River; the middle reaches of the Jinsha River include six cascade reservoirs at Liyuan, Ahai, Jinanqiao, Longkaikou, Ludila and Guanyinyan participating in the calculation; the Yalong River includes three cascade reservoirs at Lianghekou, Jinping I and Ertan participating in the calculation; the lower reaches of the Jinsha River include four cascade reservoirs at Wudongde, Baihetan, Xiluodu and Xiangjiaba participating in the calculation.

[0096] When a flood occurs, when the cascade reservoir group system executes the flood control scheduling target, the method of the present invention is used to first determine the total reserved flood control storage capacity that needs to be met according to the scheduling time and cycle, and then decompose it layer by layer according to the study area-division-sub-basin to clarify the flood control storage capacity that needs to be reserved for each cascade reservoir group. After determining different water level combinations using the method of the present invention, dynamic programming and other methods are used to optimize the calculation and determine the optimal water level combination.

[0097] As shown in Tables 1 to 12, taking the Yalong River as an example, the operating data of each cascade reservoir at different time nodes are listed; the specific dispatching process of the cascade reservoir groups in the three sub-basins is shown in Figures 3 to 5. The units of reservoir water level in the table are meters, and the units of inflow and outflow are both cubic meters per second. According to the method of the present invention, the optimal operating water level combination of the cascade reservoir groups in the three sub-basins of the Jinsha River Basin can be obtained, ensuring that the cascade power generation benefits are maximized under the premise of meeting the flood control safety of the basin.

[0098] Table 1 Specific dispatching process information table of the cascade reservoirs in the Yalong River Basin, some time periods

[0099]

[0100] Table 2 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0101]

[0102] Table 3 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0103]

[0104] Table 4 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0105]

[0106] Table 5 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0107]

[0108] Table 6 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0109]

[0110] Table 7 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0111]

[0112] Table 8 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0113]

[0114] Table 9 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0115]

[0116] Table 10 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0117]

[0118] Table 11 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0119]

[0120] Table 12 Specific dispatching process information of the cascade reservoirs in the Yalong River Basin, some time periods

[0121]

[0122] As shown in Figures 3 to 5, the method of the present invention uses the equal storage capacity line to perform preliminary screening of the operating water level combination for the cascade reservoir group, and then uses the optimization algorithm to determine the optimal water level combination at different time nodes in the scheduling period based on the water level combination that meets the reserved flood control storage capacity requirements, to ensure the maximum overall power generation benefit of the cascade, which also proves the feasibility and effectiveness of the method. It can be seen that the method has a superior application effect in the real-time forecast scheduling of cascade reservoir groups.

[0123] According to the above analysis, the method of the present invention is highly practical. It can quickly solve the operating water level process of the cascade reservoir group on the premise of meeting the flood control storage capacity required for flood control safety in the basin, thereby maximizing the overall power generation benefit of the cascade.

[0124] In summary, the present invention has the advantages of practicability and strong operability, and can quickly solve the optimal operating water level process of a group of reservoirs, providing a more scientific and efficient new method for forecasting and dispatching of river basin reservoirs.

[0125] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be based on the attached claims.

Claims

1. A short-term optimal dispatching method for cascade reservoirs based on equal storage capacity lines, characterized by: include: S1. The study area is divided into two parts according to the water system composition, which are , delineate the sub-basins and reservoir groups of each sub-region, and divide each sub-basin reservoir group into one group; S2. Calculation of the isocapacity line of the sub-basin reservoir group: The water level of each reservoir in the discrete sub-basin is calculated as The first reservoir in the sub-district For example, suppose The first reservoir in the sub-district The dead water level is , the normal high water level is , according to the step length of 0.1m, from the dead water level to the normal high water level, each discrete point is recorded as ,in, , is the total number of discrete points, and calculates the reservoir capacity corresponding to each water level , cross-combining the discrete results of water levels of all reservoirs in the sub-basin, and determining the corresponding relationship between different water level combinations of reservoir groups in the sub-basin and the total storage capacity; Assume that each type of water level combination corresponding to the same total storage capacity value Recorded as the water level of the first-level virtual reservoir ,in, To meet the same total storage capacity R The water level value of the Mth reservoir in the partition, all corresponding relationships will form a relationship line between the virtual reservoir water level and the total storage capacity of the sub-basin reservoir group. Under the same storage capacity value, the line formed by all water level combinations is an equal storage capacity line of the sub-basin reservoir group under the corresponding storage capacity value. , all equal storage capacity lines form the equal storage capacity lines of the corresponding sub-basin reservoir groups; S3. Calculation of equal storage capacity lines of sub-district reservoir groups: The water level combination and total storage capacity value corresponding to the equal storage capacity line of each sub-district sub-basin are equivalent to a secondary virtual reservoir. The different virtual reservoir combinations of the sub-districts and the total storage capacity value of the sub-district reservoir group form the equal storage capacity line of the sub-district reservoir group, that is, the total storage capacity value of each sub-district reservoir group corresponds to the water level combination of one or more sub-district sub-basin reservoir groups; S4. Calculation of equal storage capacity lines in the study area: The water level combination and total storage capacity value corresponding to the equal storage capacity lines in the study area are equivalent to a three-level virtual reservoir. Then the different virtual reservoir combinations in the study area and the total storage capacity value of the sub-district reservoir group form the equal storage capacity line of the reservoir group in the study area, that is, the total storage capacity value of any reservoir group in the study area corresponds to the water level combination of one or more sub-district reservoir groups, and then corresponds to the water level combination of one or more sub-district sub-basin reservoir groups; S5. Obtaining the water level combination of the cascade reservoir group under a certain storage capacity value: according to the calculation results of the equal storage capacity lines of the sub-basin, sub-region and study area, obtain the water level combination of the cascade reservoir group under a certain total storage capacity value of the study area, that is, obtain the water level combination of the reservoir group corresponding to the virtual reservoir water level step by step, and connect them in series with the upstream and downstream relationship to form the water level combination of the cascade reservoir group under the total storage capacity value of the study area; S6, obtaining water level combinations of cascade reservoirs under different storage capacity values: according to S5, obtaining water level combinations of cascade reservoirs under different storage capacity values; S7. Construct a short-term optimal dispatching model for cascade reservoirs: clarify dispatching objectives and constraints, determine the reserved flood control storage capacity of the cascade reservoirs according to the dispatching cycle and dispatching step, and construct a short-term optimal dispatching model for the cascade reservoirs; S8. Determine the daily, seasonal and ten-day calculation periods according to the dispatching requirements and runoff data; S9, hierarchical optimization calculation: hierarchical calculation satisfies the water level combination of each reservoir under the condition of a reserved flood control storage capacity, and the optimal combination is solved by the dynamic programming optimization algorithm, which is the optimal solution of the model; S10. After the calculation is completed, the water level operation process of each reservoir is output, which is the optimization result.

2. The short-term optimal dispatching method of cascade reservoirs based on equal storage capacity lines according to claim 1 is characterized by: The sub-basin reservoir group in S1 refers to all reservoirs included in the calculation of equal storage capacity, all of which are sub-basin controlling reservoirs, that is, large and medium-sized reservoirs with certain regulating capabilities. Other run-of-river reservoirs with small or even no regulating capacity are controlled according to the inflow balance after the starting water level is specified, and do not participate in the calculation of total storage capacity.

3. The short-term optimal dispatching method of cascade reservoirs based on equal storage capacity lines according to claim 1 is characterized by: In S2, each type of water level combination with the same total storage capacity value is sorted from small to large or from large to small in accordance with the upstream and downstream relationship of the reservoir group, starting from the first-level reservoir, when forming the water level of the virtual reservoir.

4. The short-term optimal dispatching method of cascade reservoirs based on equal storage capacity lines according to claim 2 is characterized by: The isocapacity line in S2 is a curve in plane coordinates if the number of sub-basin reservoir groups is 2; if the number of sub-basin reservoir groups is 3, the isocapacity line is extended to a surface in three-dimensional Euclidean space; if the number of sub-basin reservoir groups is , then the equal storage capacity line is extended to Hyperplane in dimensional space coordinates.

5. The short-term optimal dispatching method of cascade reservoirs based on equal storage capacity lines according to claim 3 is characterized by: In S7, the short-term optimal dispatching model of the cascade reservoir group is specifically: S701. Objective function: Cascade reservoir group power generation is maximized: ； in, To participate in the calculation of the total power generation of the power station during the dispatch period, ; is the number of reservoirs; is the reservoir number, ; is the number of time periods in the scheduling period; is the time period number, ; For the reservoir In the period of effort, ; For the period The number of hours, ; S702, Constraints: Cascade reserved flood control storage capacity requirements: Ensure that the total flood control storage capacity of the cascade reservoir group in each period during the dispatch period is not less than the target value: ； in, For the reservoir In the period of reserved flood control storage capacity, ; For the period The total flood control storage capacity that needs to be reserved is ; Water balance equation: It is the balance relationship between the inflow and outflow of water in a single reservoir in time and in the space of a cascade reservoir group. Specifically: ； ； in, For the reservoir In the period The total inbound flow, ; , , Reservoirs In the period The power generation flow, interval flow and abandoned water flow, ; For the reservoir No. directly upstream reservoir; For the reservoir The set of all directly upstream reservoirs; The water level, power generation flow, outflow flow and output constraints are: ； in, For the reservoir The initial water level during the scheduling period is ; For the reservoir The starting water level, ; For the reservoir In the period The water level, ; Reservoirs In the period The upper and lower limits of water level; Reservoirs In the period The upper limit and lower limit of power generation flow; For the reservoir In the period Outbound flow, ; Reservoirs In the period The upper and lower limits of outbound flow; For the reservoir In the period of effort, ; Reservoirs In the period The output upper limit and the output lower limit.

6. A short-term optimal dispatching system for cascade reservoirs based on equal storage capacity lines, characterized by: comprising at least one processor; and at least one memory in communication with the processor, wherein: The memory stores instructions that can be executed by the processor, and the instructions are used to be executed by the processor to implement a short-term optimization scheduling method for a cascade reservoir group based on an equal storage capacity line as described in any one of claims 1 to 5.

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