Short-term scheduling method and system for water-light-storage integrated system

Abstract

The invention provides a short-term scheduling method and system for a water-light-storage integrated system, and the method comprises the following steps: determining the optimal water-light complementary output based on the common hydropower electric quantity and a photovoltaic output process, and deducing the output process of common hydropower in complementary operation according to the optimal water-light complementary output; solving the pumped storage energy absorption electric quantity by combining the channel capacity and the water-light output process, and performing discharge distribution according to the obtained pumped storage energy absorption electric quantity; the on-grid output process of the water-light-storage integrated system is calculated according to the output process of the common hydropower station, the photovoltaic power station and the pumped storage, and the total on-grid electricity quantity and the electricity abandoning rate of the system in the dispatching period are calculated according to the on-grid output process. According to the method, the adjusting effect of the pumped storage power station in multi-energy complementary operation is considered, the short-term scheduling process of the common hydropower station and the pumped storage power station in the multi-energy complementary system is described, short-term operation of the water-light-storage integrated system is effectively simulated, and a new way is provided for operation scheduling and feature extraction of the integrated system.

Description

Technical Field

[0001] The present invention relates to the technical field of clean renewable energy utilization and reservoir scheduling, and in particular to a short-term scheduling method and system for a water-solar-storage integrated system. Background Art

[0002] As my country has proposed the goal of "striving to peak carbon dioxide emissions before 2030 and strive to achieve carbon neutrality before 2060", the pace of low-carbon transformation of electric energy has accelerated, and vigorously developing renewable energy such as hydropower, wind and solar power has become an inevitable choice to help achieve low-carbon emission reduction goals. Hydropower units have the characteristics of rapid start and stop, flexible operation, large output variation amplitude, and fast response to load changes. They are ideal peak-shaving power sources. Using hydropower to regulate wind and photovoltaic power to form a multi-energy complementary system is a new idea to solve the current problem of wind and photovoltaic power consumption. Therefore, how to reasonably dispatch hydropower in the short term to neutralize the randomness and volatility of wind and solar power output to improve energy utilization efficiency and economic benefits has become a hot research issue in the energy field.

[0003] At present, research on the short-term operation of multi-energy complementarity between hydropower, wind and solar power mainly focuses on three aspects: optimization modeling, efficient solution, and risk assessment. Most of the research only focuses on the complementary scheduling and operation of ordinary hydropower and wind and solar power, and there is a lack of research on the scheduling of complementary systems that include energy storage facilities such as pumped-storage power stations. The extraction of short-term operation characteristics of integrated systems of power generation facilities and energy storage facilities needs to be further studied. Summary of the invention

[0004] In response to the technical problems existing in the prior art, the present invention provides a short-term scheduling method and system for an integrated water-photovoltaic-storage system, which effectively simulates the short-term operation process of hydropower, photovoltaics and pumped storage, and provides a new approach for short-term scheduling and feature extraction of an integrated water-photovoltaic-storage system.

[0005] According to a first aspect of the present invention, the present invention provides a short-term scheduling method for a water-solar-storage integrated system, comprising the following steps:

[0006] Determine the optimal water-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output process, and deduce the output process of ordinary hydropower under complementary operation based on the optimal water-photovoltaic complementary output;

[0007] Combine the channel capacity with the hydropower output process to solve the pumped storage energy absorption capacity, and distribute the discharge according to the obtained pumped storage energy absorption capacity;

[0008] The grid-connected output process of the integrated hydropower, photovoltaic power station and pumped storage is calculated based on the output process of ordinary hydropower, photovoltaic power station and pumped storage, and the total grid-connected power and power abandonment rate of the system during the scheduling period are calculated accordingly.

[0009] Based on the above technical solution, the present invention can also make the following improvements.

[0010] Optionally, the optimal hydro-photovoltaic complementary output is determined based on the ordinary hydropower and photovoltaic output process, and the conditions that the ordinary hydropower output process under complementary operation must meet are deduced based on the optimal hydro-photovoltaic complementary output: after the system power is bundled and transmitted, it continues to be adjusted by the energy storage device to meet the load, and the system scheduling operation does not consider the load at this time;

[0011] The goal is to ensure that the total hydropower and photovoltaic power output does not exceed the channel capacity and is evenly distributed, that is, to determine the optimal hydropower and photovoltaic complementary output, so that ordinary hydropower can be supplemented as much as possible when photovoltaic power output is insufficient, maintain the minimum output when photovoltaic power output is sufficient, and just complete the ordinary hydropower electricity distribution.

[0012] Optionally, in determining the optimal water-solar complementary output N CO After that, the output process of ordinary hydropower under complementary operation is expressed as:

[0013]

[0014] Where N CO To achieve the best water-light complementation, are the outputs of ordinary hydropower and photovoltaic power stations in the t period, It is the lower limit of ordinary hydropower output. is the upper limit of ordinary hydropower output, and T is the number of time periods in the dispatch period.

[0015] Optionally, determine the optimal water-solar complementary output N CO The process is: first formulate an optimal water-solar complementary output N CO , calculate the ordinary hydropower output and accumulate the power like Then increase the proposed N CO , E HP Indicates the amount of electricity that needs to be allocated for ordinary hydropower. Then reduce the proposed N CO , cycle until the two are equal; the optimal water-solar complementary output N CO It is expressed as:

[0016]

[0017] Where D t Ordinary hydropower can be added to N CO The time period set, that is For ordinary hydropower in D t Output strategy,

[0018] Optionally, the channel capacity is combined with the hydro-solar output process to solve the pumped storage power absorption, and discharge distribution is performed according to the obtained pumped storage power absorption. The goal is to reduce power abandonment as much as possible and supplement the period of low hydro-solar output to make the total output process relatively uniform.

[0019] Optionally, the combining of the channel capacity and the water-solar output process to solve the amount of electricity absorbed by pumped storage includes:

[0020] First, calculate the power absorption process. When the total output of water and light exceeds the channel capacity, the pumped storage power station pumps water to absorb the excess output. The accumulated power absorbed is the power absorbed by the pumped storage. The power absorption process is expressed as:

[0021]

[0022] Where: is the output of the pumped storage power station in the tth period, with positive values ​​indicating discharge and negative values ​​indicating charge; is the channel capacity; Installed capacity for pumped storage power stations; S is the upper limit of the output of the pumped storage power station in the t period, which is determined by the upper limit of the reserve and the remaining output space; t It is the set of time periods when the total water-light output is greater than the channel capacity.

[0023] Optionally, discharging and distributing the power absorbed by the pumped storage according to the obtained power includes:

[0024] First, formulate an optimal water-solar-storage complementary output N IG , calculate the pumped storage output and accumulate the electricity like Then increase the proposed N IG ,like Then reduce the proposed N IG , cyclic operation until the two are equal; among them, the optimal water-solar-storage complementary output N IG It is expressed as:

[0025]

[0026] Where N IG To provide the best complementary power of water, light and storage; R t is the set of time periods when the total water-light output is less than the channel capacity; I t For R t A subset of N, indicating that pumped storage can be replenished to IG The time period collection; For pumped storage in I t Internal output strategy.

[0027] Optionally, the total grid-connected power of the system during the scheduling period is expressed as:

[0028]

[0029] In the formula, E IS is the total grid-connected power of the system during the dispatch period, They are the grid-connected output of ordinary hydropower, photovoltaic power, and pumped storage in period t;

[0030] Optionally, the power abandonment rate of the system during the dispatch period is expressed as:

[0031]

[0032] In the formula, γ is the power abandonment rate of the system during the dispatch period, are the grid-connected output of ordinary hydropower, photovoltaic power, and pumped storage in the t period, E LO 、E PV They represent the total power loss and photovoltaic power generation of the system during the dispatch period respectively.

[0033] According to a second aspect of the present invention, a short-term scheduling system for a water-solar-storage integrated system is provided, comprising:

[0034] The hydropower output calculation module is used to determine the optimal hydropower-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output processes, and to deduce the output process of ordinary hydropower under complementary operation based on the optimal hydropower-photovoltaic complementary output;

[0035] The pumped storage output calculation module is used to solve the pumped storage energy absorption capacity by combining the channel capacity and the water-light output process, and to distribute the discharge according to the obtained pumped storage energy absorption capacity;

[0036] The characteristic index extraction module is used to calculate the online output process of the integrated hydropower, photovoltaic power station and pumped storage system according to the output process of ordinary hydropower, photovoltaic power station and pumped storage, and calculate the total online power and power abandonment rate of the system during the scheduling period.

[0037] Technical effects and advantages of the present invention:

[0038] The present invention provides a short-term scheduling method and system for an integrated hydropower, photovoltaic and energy storage system. Aiming at the problem of lack of scheduling operation and feature extraction methods for an integrated system of power generation facilities and energy storage facilities, the present invention effectively simulates the short-term complementary operation process of ordinary hydropower, photovoltaic and pumped storage by depicting the regulatory effect of pumped storage on complementary operation and extracts short-term operation characteristic indicators, providing a new approach for short-term scheduling and feature extraction of the integrated system.

[0039] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A flow chart of a short-term scheduling method for a water-solar-storage integrated system proposed in an embodiment of the present invention;

[0041] Figure 2 This is a typical day simulation scheduling process of a certain hydro-solar-storage integrated system proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that the embodiment of the present invention is aimed at the study of the scheduling and operation of energy storage facilities such as pumped-storage power stations and ordinary hydropower and wind and solar complementary systems, providing a new approach to extracting short-term operating characteristics of integrated systems of power generation facilities and energy storage facilities.

[0044] It is understandable that based on the defects in the background technology, the embodiment of the present invention proposes a short-term scheduling method for a water-solar-storage integrated system, including the following steps:

[0045] Step S1, determining the optimal water-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output process, and deducing the output process of ordinary hydropower under complementary operation according to the optimal water-photovoltaic complementary output;

[0046] It should be noted that the ordinary hydropower electricity refers to the hydropower electricity generated in a single period of time in the results of the ordinary hydropower medium- and long-term scheduling, and in the embodiment of the present invention, it refers to the daily hydropower electricity generated;

[0047] The photovoltaic output process is the power generation process of the photovoltaic power station, and in the embodiment of the present invention, it is the power generation process of the photovoltaic power station during the day; both of the above are known data and can be calculated through historical measured runoff, radiation, and temperature data.

[0048] The optimal hydro-photovoltaic complementary output is determined based on the ordinary hydropower and photovoltaic output process. According to the optimal hydro-photovoltaic complementary output, the conditions that the ordinary hydropower output process must meet under complementary operation are deduced: after the system power is bundled and transmitted, it continues to be adjusted by the energy storage device to meet the load. At this time, the system dispatching operation does not consider the load for the time being;

[0049] The goal is to ensure that the total hydropower and photovoltaic power output does not exceed the channel capacity and is evenly distributed, that is, to determine the optimal hydropower and photovoltaic complementary output, so that ordinary hydropower can be supplemented as much as possible when photovoltaic power output is insufficient, maintain the minimum output when photovoltaic power output is sufficient, and just complete the ordinary hydropower electricity distribution.

[0050] The time allocation of ordinary hydropower electricity (ordinary hydropower output process) must be carried out within its output range, that is, Ordinary hydropower electricity E HP The allocation needs to be done exactly:

[0051]

[0052] In the formula, is the output of ordinary hydropower in the tth period; T is the number of time periods in the dispatch period; Δt is the length of the time period.

[0053] In determining the optimal water-solar complementary output N CO After that, the output process of ordinary hydropower under complementary operation is expressed as follows:

[0054]

[0055] In the formula, are the outputs of ordinary hydropower and photovoltaic power in the tth period respectively, and T is the number of time periods in the scheduling period.

[0056] In actual calculation, we need to first find N CO The value of N can be determined by the following method. CO , specifically including:

[0057] First, draw up an N CO , calculate the ordinary hydropower output according to formula (2) and accumulate the power It's about N CO increasing function), if Then increase the proposed N CO ,like Then reduce the proposed N CO , and repeat the operation until the two are equal.

[0058] Optimal water-solar complementary output N CO Its meaning is expressed as:

[0059]

[0060] Where D t Ordinary hydropower can be added to N CO The time period set, that is For ordinary hydropower in D t Output strategy,

[0061] Step S2, combining the channel capacity and the hydro-solar output process to solve the pumped storage energy absorption capacity, and discharging and distributing the pumped storage energy absorption capacity according to the obtained pumped storage energy absorption capacity;

[0062] It should be noted that the channel capacity is the transmission capacity of the power transmission channel of the integrated water-solar-storage system, and the unit is the same as the power unit, which is a known data.

[0063] Based on the results of the complementary operation of ordinary hydropower and photovoltaic power, the pumped storage power station further adjusts the daily output process to maximize the total grid-connected power of the system and make the grid-connected output process relatively stable. That is, the goal of pumped storage regulation is to reduce power abandonment as much as possible and supplement the period of low hydropower and photovoltaic output to make the total output process relatively uniform. The pumped storage regulation process includes the charging process and the discharging process, in which:

[0064] The charging process is as follows: when the total hydropower output exceeds the channel capacity, the pumped storage power station pumps water to absorb the excess output. The amount of absorbed output is affected by the installed capacity and available reserves of the power station, and the balance of electricity within the day must be considered;

[0065] The discharge process is: when the total output of water and light is less than the channel capacity, the pumped storage power station releases water to supplement the grid output. The calculation method is similar to the water-light complementarity: determine the optimal water-light-storage complementary output so that the pumped storage can supply N when the water-light output is insufficient. IG Replenish as much as possible and just complete the discharge distribution of pumped storage electricity.

[0066] Specifically, when the total hydropower output exceeds the channel capacity, the pumped storage power station pumps water to absorb the excess output. The amount of absorbed output is affected by the installed capacity and available reserves of the power station, and the daily power balance must be considered:

[0067]

[0068] Where: is the output of the pumped storage power station in the tth period, with positive values ​​indicating discharge and negative values ​​indicating charge; is the channel capacity; Installed capacity for pumped storage power stations; S is the upper limit of the output of the pumped storage power station in the t period, which is determined by the upper limit of the reserve and the remaining output space; t It is the set of time periods when the total water-light output is greater than the channel capacity.

[0069] in, It is expressed as:

[0070]

[0071] Where: is the upper limit of the output of the pumped storage power station in period t, which is determined by the upper limit of the reserve and the remaining output space; The upper limit of the storage capacity of pumped storage power stations; It is the pumped storage capacity corresponding to the remaining output space in the channel capacity except for water light; is the amount of electricity stored in the pumped-storage power station at the beginning of the tth period; η1 is the charging efficiency of the pumped-storage power station.

[0072] When the total output of water and solar power is less than the channel capacity, the pumped storage power station releases water to supplement the grid output. The calculation method is similar to that of water-solar complementarity: Determine the optimal water-solar-storage complementarity output N IG , so that pumped storage can supply N when the water output is insufficient IG Replenish as much as possible and just complete the discharge distribution of pumped storage electricity.

[0073] Similarly, we need to first find N IG The value of N can also be determined by trial calculation. CO , specifically:

[0074] First, formulate an optimal water-solar-storage complementary output N IG , calculate the pumped storage output according to formula (8) and accumulate the electricity ( It's about N IG increasing function), if Then increase the proposed N IG ,like Then reduce the proposed N IG , and repeat the operation until the two are equal.

[0075] Optimal water-solar-storage complementary output N IG , Pumped storage power E PS , Pumped Storage Discharge Output It is expressed as follows:

[0076]

[0077]

[0078]

[0079] Where: N IG To provide the best complementary power of water, light and storage; R t I is the set of time periods when the total water-light output is less than the channel capacity;t For R t A subset of N, indicating that pumped storage can be replenished to IG The time period collection; For pumped storage in I t Internal output strategy; E PS is the reserve utilized by pumped storage during the dispatch period; η2 is the discharge efficiency of the pumped storage power station.

[0080] Step S3, calculating the online output process of the integrated hydropower, photovoltaic and pumped storage system according to the output process of ordinary hydropower, photovoltaic power station and pumped storage, and calculating the total online power and power abandonment rate of the system during the scheduling period accordingly.

[0081] In this embodiment, the power output process within the channel capacity is the online power output process (with photovoltaic power abandonment being given priority), and the total online power and abandonment rate of the system are calculated as follows:

[0082]

[0083]

[0084]

[0085] Where: are the grid-connected outputs of ordinary hydropower, photovoltaic power, and pumped storage in period t; E IS 、E LO 、E PV They are the total grid-connected power of the system during the dispatching period (intraday) (power transmitted to the grid by the integrated hydro-solar-storage system), total power loss (direct power abandonment from photovoltaic power + loss from pumped storage), and photovoltaic power generation; γ is the power abandonment rate of the system during the dispatching period (total power abandonment / total power generation).

[0086] Example: Taking a hydropower-solar-storage integrated system as an example, the system is equipped with 4.82 million kW of hydropower, 3 million kW of pumped storage, and 16.19 million kW of photovoltaic power, which are transmitted through a ±800 kV ultra-high voltage direct current channel. The maximum transmission capacity of a single channel is 8 million kW. The characteristic parameters of the system are shown in Table 1.

[0087] Table 1 Characteristic parameters of water-solar-storage integrated system

[0088]

[0089]

[0090] Taking the hourly inflow in a typical flood year (June 2003-May 2004), a typical normal water year (June 2013-May 2014), and a typical dry year (June 2006-May 2007), the hourly photovoltaic output, and the daily water level and electricity allocated by medium- and long-term scheduling as input, the water-photovoltaic complementary operation and pumped storage secondary regulation are carried out successively to obtain the daily complementary operation process of the system.

[0091] According to the daily complementary operation process of the system, the two characteristic indicators of daily total grid-connected power and power abandonment rate are calculated, and compared with the results obtained by the traditional hydro-solar-storage short-term optimization scheduling model. The mean absolute percentage error (MAPE) of daily grid-connected power is about 1.21%, and the mean absolute percentage error of daily power abandonment rate is about 1.14%. It can be seen that the method of the present invention can effectively extract the short-term scheduling characteristics of the hydro-solar-storage integrated system.

[0092] Six typical days are selected according to different periods and different combinations of hydropower and solar power output. Their daily output characteristics are shown in Table 2, showing the intraday scheduling process. Figure 2 shown.

[0093] Table 2 Typical daily output characteristics

[0094]

[0095] Depend on Figure 2 From (a) to (c), we can see that when the complementary operation is in the flood season: moderate average hydropower output can be supplemented according to the fluctuation of photovoltaic output, and the part exceeding the channel capacity is adjusted by the pumped storage power station, and the power abandonment rate is relatively small; when the average hydropower output is close to the installed capacity, if the hydropower output is reduced, water abandonment will occur, that is, the hydropower regulation space is small, and the larger hydropower output squeezes the channel space of photovoltaic output, and the power abandonment rate increases. Figure 2 (d) to (f) show that when the complementary operation is in the non-flood season: the moderate average hydropower output also effectively offsets the photovoltaic output; and when the average hydropower output gradually increases, due to the limitation of the maximum outflow of the reservoir in the non-flood season, the adjustment space of the hydropower output is small, and it has to maintain a large output in the middle period when the photovoltaic output is large, squeezing the channel space of the photovoltaic output and increasing the power abandonment rate. In summary, the operation results obtained by the dispatching method well adjust the hydropower and pumped storage to offset the fluctuation of photovoltaics on the basis of satisfying the constraints, and effectively simulate the short-term dispatching process of the integrated hydropower-solar-storage system.

[0096] To sum up, the short-term scheduling method of the integrated hydropower, photovoltaic and storage system provided in the embodiment of the present invention takes into account the role of pumped-storage power stations in multi-energy complementary operation, effectively simulates the short-term complementary operation process of ordinary hydropower, photovoltaics and pumped storage, and extracts short-term operation characteristic indicators, providing a new approach for short-term scheduling and feature extraction of integrated systems.

[0097] According to a second aspect of the present invention, a short-term scheduling system for a water-solar-storage integrated system is provided, comprising:

[0098] The hydropower output calculation module is used to determine the optimal hydropower-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output processes, and to deduce the output process of ordinary hydropower under complementary operation based on the optimal hydropower-photovoltaic complementary output;

[0099] The pumped storage output calculation module is used to solve the pumped storage energy absorption capacity by combining the channel capacity and the water-light output process, and to distribute the discharge according to the obtained pumped storage energy absorption capacity;

[0100] The characteristic index extraction module is used to calculate the online output process of the integrated hydropower, photovoltaic power station and pumped storage system according to the output process of ordinary hydropower, photovoltaic power station and pumped storage, and calculate the total online power and power abandonment rate of the system during the scheduling period.

[0101] It can be understood that the short-term scheduling system of a water-photovoltaic-storage integrated system provided by the present invention corresponds to the short-term scheduling method of a water-photovoltaic-storage integrated system provided by the aforementioned embodiments. The relevant technical features of the short-term scheduling system of a water-photovoltaic-storage integrated system can refer to the relevant technical features of the short-term scheduling method of a water-photovoltaic-storage integrated system, which will not be repeated here.

[0102] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A short-term scheduling method for a hydro-photovoltaic-storage integrated system, characterized in that: The steps include: Determine the optimal water-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output process, and deduce the output process of ordinary hydropower under complementary operation based on the optimal water-photovoltaic complementary output; Combine the channel capacity with the hydropower output process to solve the pumped storage energy absorption capacity, and distribute the discharge according to the obtained pumped storage energy absorption capacity; The grid-connected output process of the integrated hydropower, photovoltaic power station and pumped storage is calculated based on the output process of ordinary hydropower, photovoltaic power station and pumped storage, and the total grid-connected power and power abandonment rate of the system during the scheduling period are calculated accordingly.

2. The short-term scheduling method of a water-solar-storage integrated system according to claim 1 is characterized in that: The optimal hydro-photovoltaic complementary output is determined based on the ordinary hydropower and photovoltaic output process. According to the optimal hydro-photovoltaic complementary output, the conditions that the ordinary hydropower output process must meet under complementary operation are deduced: after the system power is bundled and transmitted, it continues to be adjusted by the energy storage device to meet the load. At this time, the system dispatching operation does not consider the load; The goal is to ensure that the total hydropower and photovoltaic power output does not exceed the channel capacity and is evenly distributed, that is, to determine the optimal hydropower and photovoltaic complementary output, so that ordinary hydropower can be supplemented as much as possible when photovoltaic power output is insufficient, maintain the minimum output when photovoltaic power output is sufficient, and just complete the ordinary hydropower electricity distribution.

3. The short-term scheduling method of a water-solar-storage integrated system according to claim 2 is characterized in that: In determining the optimal water-solar complementary output N CO After that, the output process of ordinary hydropower under complementary operation is expressed as: Where N CO Contribute to the optimal water-light complementation; are the outputs of ordinary hydropower and photovoltaic power stations in the t period respectively; It is the lower limit of ordinary hydropower output; is the upper limit of ordinary hydropower output; T is the number of time periods in the dispatch period.

4. The short-term scheduling method of a water-solar-storage integrated system according to claim 3 is characterized in that: Determine the optimal water-solar complementary output N CO The process is: first formulate an optimal water-solar complementary output N CO , calculate the ordinary hydropower output and accumulate the power like Then increase the proposed N CO , E HP Indicates the amount of electricity that needs to be allocated for ordinary hydropower. Then reduce the proposed N CO , cycle until the two are equal; the optimal water-solar complementary output N CO It is expressed as: Where D t Ordinary hydropower can be added to N CO The time period set, that is For ordinary hydropower in D t Output strategy, 5. The short-term scheduling method of a water-solar-storage integrated system according to claim 1 is characterized in that: The described method combines the channel capacity with the hydropower output process to solve the pumped storage power absorption, and performs discharge distribution according to the obtained pumped storage power absorption. The goal is to reduce power abandonment as much as possible and supplement the period with low hydropower output to make the total output process relatively uniform.

6. A short-term scheduling method for a water-solar-storage integrated system according to claim 5, characterized in that: The process of combining channel capacity with water-solar power output to solve the absorbed power of pumped storage includes: First, calculate the power absorption process. When the total output of water and light exceeds the channel capacity, the pumped storage power station pumps water to absorb the excess output. The accumulated power absorbed is the power absorbed by the pumped storage. The power absorption process is expressed as: Where: is the output of the pumped storage power station in the tth period, with positive values ​​indicating discharge and negative values ​​indicating charge; is the channel capacity; Installed capacity for pumped storage power stations; is the upper limit of the output of the pumped storage power station in the t period, which is determined by the upper limit of the reserve and the remaining output space; S t It is the set of time periods when the total water-light output is greater than the channel capacity.

7. The short-term scheduling method of a water-solar-storage integrated system according to claim 5, characterized in that: The discharging distribution according to the obtained pumped storage absorbed electricity comprises: First, formulate an optimal water-solar-storage complementary output N IG , calculate the pumped storage output and accumulate the electricity like Then increase the proposed N IG , E PS Indicates the amount of electricity absorbed by pumped storage. Then reduce the proposed N IG , cyclic operation until the two are equal; among them, the optimal water-solar-storage complementary output N IG It is expressed as: Where N IG To provide the best complementary power of water, light and storage; R t is the set of time periods when the total water-light output is less than the channel capacity; I t For R t A subset of N, indicating that pumped storage can be replenished to IG The time period collection; For pumped storage in I t Internal output strategy.

8. The short-term scheduling method of a water-solar-storage integrated system according to claim 1, characterized in that: The total grid-connected power of the system during the dispatch period is expressed as: In the formula, E IS is the total grid-connected power of the system during the dispatch period; P t HP , P t PV , P t PS They are respectively the online output of ordinary hydropower, photovoltaic power and pumped storage in period t.

9. The short-term scheduling method of a water-solar-storage integrated system according to claim 1, characterized in that: The power abandonment rate of the system during the dispatch period is expressed as: In the formula, γ is the power abandonment rate of the system during the dispatch period, are the grid-connected outputs of ordinary hydropower, photovoltaic power, and pumped storage in period t; E LO 、E PV They represent the total power loss and photovoltaic power generation of the system during the dispatch period respectively.

10. A short-term dispatching system for a hydro-photovoltaic-storage integrated system, characterized in that: include: The hydropower output calculation module is used to determine the optimal hydropower-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output processes, and to deduce the output process of ordinary hydropower under complementary operation based on the optimal hydropower-photovoltaic complementary output; The pumped storage output calculation module is used to solve the pumped storage energy absorption capacity by combining the channel capacity and the water-light output process, and to distribute the discharge according to the obtained pumped storage energy absorption capacity; The characteristic index extraction module is used to calculate the online output process of the integrated hydropower, photovoltaic power station and pumped storage system according to the output process of ordinary hydropower, photovoltaic power station and pumped storage, and calculate the total online power and power abandonment rate of the system during the scheduling period.

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