A short-term scheduling method and system for a hydro-photovoltaic-storage integrated system

Abstract

The present invention provides a short-term scheduling method and system for an integrated hydropower, photovoltaic, and storage system. The method includes the following steps: determining the optimal hydropower and photovoltaic complementary output based on the ordinary hydropower and photovoltaic output processes, and deducing the output process of ordinary hydropower under complementary operation based on the optimal hydropower and photovoltaic complementary output; solving the pumped storage energy absorption capacity based on the channel capacity and the hydropower and photovoltaic output processes, and discharging the energy according to the obtained pumped storage energy absorption capacity; calculating the online output process of the integrated hydropower, photovoltaic, and storage system based on the output processes of ordinary hydropower, photovoltaic power stations, and pumped storage, and calculating the total online power and curtailment rate of the system during the scheduling period. The present invention takes into account the regulatory role of pumped storage power stations in multi-energy complementary operation, describes the short-term scheduling process of ordinary hydropower stations and pumped storage power stations in the multi-energy complementary system, effectively simulates the short-term operation of the integrated hydropower, photovoltaic, and storage system, and provides a new approach 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 an integrated water-solar-storage system. Background Art

[0002] The transition to a low-carbon electric energy sector is accelerating, and the vigorous development of renewable energy sources such as hydropower, wind power, and solar power has become an inevitable choice to help achieve low-carbon emission reduction goals. Hydropower units offer rapid start-up and shutdown, flexible operation, large output fluctuations, and rapid response to load changes, making them ideal peak-shaving power sources. Leveraging hydropower to regulate wind and solar power, forming a multi-energy complementary system, offers a new approach to addressing the current challenges of wind and solar power consumption. Therefore, how to rationally dispatch hydropower in the short term to offset the randomness and volatility of wind and solar power output, thereby improving energy efficiency and economic benefits, has become a hot research topic in the energy sector.

[0003] At present, research on the short-term operation of multi-energy complementarity between hydropower, wind power and solar power mainly focuses on three aspects: optimization modeling, efficient solution and risk assessment. Most studies only focus on the complementary scheduling operation of ordinary hydropower and wind power and solar power, and lack 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 in-depth research. 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 the 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 an integrated water-solar-storage system, comprising the following steps:

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

[0007] Combine the channel capacity and the hydro-solar 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] On the basis of the above technical solution, the present invention can also make the following improvements.

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

[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 supplement 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 power distribution.

[0012] Optional, in determining the optimal water-solar complementary output Finally, the output process of ordinary hydropower under complementary operation is expressed as:

[0013]

[0014] Where, To achieve the best water-light complementary output, They are ordinary hydropower and photovoltaic power stations in the first Output during the period, It is the lower limit of ordinary hydropower output. This is the upper limit of ordinary hydropower output. is the number of scheduling periods.

[0015] Optional: Determine the optimal water-solar complementary output The process is: first formulate an optimal water-solar complementary output , calculate the ordinary hydropower output and accumulate the power ,like Increase the planned , Indicates the amount of electricity that needs to be allocated for ordinary hydropower. If Reduce the planned , cycle until the two are equal; optimal water-solar complementary output Expressed as:

[0016]

[0017] Where, Ordinary hydropower can be added to The set of time periods, that is ; For ordinary hydropower Output strategy, .

[0018] Optionally, the channel capacity and the hydro-solar output process are combined to solve the pumped storage energy absorption capacity, and discharge distribution is performed according to the obtained pumped storage energy absorption capacity. 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 hydro-solar output process to solve the amount of electricity absorbed by the pumped storage includes:

[0020] First, calculate the power absorption process. When the total hydropower output 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: For pumped storage power station Output during a period, positive value indicates discharge, negative value indicates charge; is the channel capacity; Installed capacity for pumped storage power stations; For pumped storage power station The upper limit of the output absorbed during the period is determined by the upper limit of reserves and the remaining output space; It is the set of time periods when the total output of water and light is greater than the channel capacity.

[0023] Optionally, distributing discharge according to the obtained pumped storage absorbed electricity includes:

[0024] First formulate an optimal water-solar-storage complementary output , calculate the pumped storage output and accumulate the electricity ,like , then increase the proposed ,like Reduce the planned , the cycle operation is continued until the two are equal; among them, the optimal water-solar-storage complementary output Expressed as:

[0025]

[0026]

[0027] Where, To provide the best complementary power of water, light and storage; It is the set of time periods when the total water-light output is less than the channel capacity; for subset, indicating that pumped storage can be replenished to The time period collection; For pumped storage Internal output strategy.

[0028] Optionally, the total on-grid power consumption of the system during the scheduling period is expressed as:

[0029]

[0030] Where, is the total on-grid power of the system during the scheduling period, They are ordinary hydropower, photovoltaic and pumped storage in the first Internet access output during the time period;

[0031] Optionally, the curtailment rate of the system during the dispatch period is expressed as:

[0032]

[0033] Where, is the power curtailment rate of the system during the dispatch period, They are ordinary hydropower, photovoltaic and pumped storage in the first Internet access output during the time period, 、 They represent the total power loss and photovoltaic power generation of the system during the scheduling period respectively.

[0034] According to a second aspect of the present invention, a short-term scheduling system for an integrated hydro-photovoltaic-storage system is provided, comprising:

[0035] The hydropower output calculation module is used to determine the optimal hydropower and 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 and photovoltaic complementary output;

[0036] The pumped storage output calculation module is used to calculate the pumped storage energy absorption capacity by combining the channel capacity and the hydro-solar output process, and to distribute the discharge according to the obtained pumped storage energy absorption capacity;

[0037] The characteristic index extraction module is used to calculate the grid-connected output process of the integrated hydropower, photovoltaic power station and pumped storage system based on the output process of ordinary hydropower, photovoltaic power station and pumped storage, and calculate the total grid-connected power and power abandonment rate of the system during the scheduling period.

[0038] Technical effects and advantages of the present invention:

[0039] The present invention provides a short-term scheduling method and system for an integrated hydropower, photovoltaic and energy storage system. Addressing the lack of scheduling operation and feature extraction methods for integrated systems of power generation facilities and energy storage facilities, the present invention effectively simulates the short-term complementary operation process of ordinary hydropower, photovoltaics 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 integrated systems.

[0040] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be 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

[0041] Figure 1 This is a flow chart of the short-term scheduling method for the integrated water, solar and storage system proposed in an embodiment of the present invention;

[0042] 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

[0043] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that the embodiments of the present invention are aimed at studying the scheduling and operation of complementary systems of energy storage facilities such as pumped storage power stations and ordinary hydropower and wind and solar power, and provide a new approach to extracting short-term operating characteristics of integrated systems of power generation facilities and energy storage facilities.

[0045] It is understandable that, based on the deficiencies in the background technology, the embodiment of the present invention proposes a short-term scheduling method for an integrated water-solar-storage system, including the following steps:

[0046] Step S1: Determine the optimal hydropower-photovoltaic complementary output based on the ordinary hydropower and photovoltaic output processes, and deduce the output process of ordinary hydropower under complementary operation based on the optimal hydropower-photovoltaic complementary output;

[0047] It should be noted that the ordinary hydropower electricity refers to the hydropower generation in a single period of 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 generation;

[0048] 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.

[0049] The optimal hydropower-solar complementary output is determined based on the conventional hydropower and photovoltaic output processes. Based on the optimal hydropower-solar complementary output, the conditions that must be met for the conventional hydropower output process under complementary operation are as follows: after the system power is bundled and transmitted, it relies on the energy storage device to continue to regulate to meet the load. At this time, the system scheduling operation does not consider the load.

[0050] 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 supplement 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 power distribution.

[0051] The time allocation of ordinary hydropower electricity (ordinary hydropower output process) must be carried out within its output range, that is, ; Ordinary hydropower The allocation needs to be done exactly:

[0052] (1)

[0053] Where, For ordinary hydropower Output during the time period; is the number of time periods in the scheduling period; For a long period of time.

[0054] In determining the optimal water-solar complementary output Finally, the output process of ordinary hydropower under complementary operation is expressed as follows:

[0055] (2)

[0056] Where, They are ordinary hydropower, photovoltaic Output during the period, is the number of scheduling periods.

[0057] In actual calculation, we need to first find The value of , at this time, can be determined by the following method , specifically including:

[0058] First draw up a Calculate the ordinary hydropower output according to formula (2) and accumulate the power ( It's about increasing function), if Increase the planned ,like Reduce the planned , and repeat the operation until the two are equal.

[0059] Optimal water-solar complementary output Its meaning is expressed as:

[0060] (3)

[0061] Where, Ordinary hydropower can be added to The set of time periods, that is ; For ordinary hydropower Output strategy, .

[0062] Step S2: Calculate the amount of electricity absorbed by the pumped storage system by combining the channel capacity and the hydro-solar output process, and distribute the discharge according to the obtained amount of electricity absorbed by the pumped storage system;

[0063] 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.

[0064] Based on the complementary operation of conventional hydropower and photovoltaic power, pumped storage power stations further adjust their daily output to maximize the system's total on-grid power and maintain a relatively stable on-grid output. The goal of pumped storage regulation is to minimize curtailment and supplement periods of low hydropower and photovoltaic output to ensure a relatively uniform overall output. The pumped storage regulation process includes charging and discharging.

[0065] 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 power station's installed capacity, available reserves, and the need to consider the daily power balance.

[0066] The discharge process is: when the total output of hydropower 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 the hydro-solar complementarity: determine the optimal hydro-solar-storage complementary output so that the pumped storage power station can be used to generate power when the hydro-solar output is insufficient. Replenish as much as possible and just complete the discharge distribution of pumped storage electricity.

[0067] Specifically, a pumped storage power station pumps water to absorb excess power when the total hydropower output exceeds the channel capacity. The amount of power absorbed is affected by the installed capacity and available reserves of the power station, and the daily power balance must be considered:

[0068] (4)

[0069] Where: For pumped storage power station Output during a period, positive value indicates discharge, negative value indicates charge; is the channel capacity; Installed capacity for pumped storage power stations; For pumped storage power station The upper limit of the output absorbed during the period is determined by the upper limit of reserves and the remaining output space; It is the set of time periods when the total output of water and light is greater than the channel capacity.

[0070] in, Expressed as:

[0071] (5)

[0072] Where: For pumped storage power station The upper limit of the output absorbed during the period is determined by the upper limit of reserves 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; For pumped storage power station The amount of electricity stored at the beginning of the time period; Charging efficiency of pumped storage power station.

[0073] 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 and solar complementarity: determine the optimal water, solar and storage complementary output , so that pumped storage can be used to store water when the water output is insufficient. Replenish as much as possible and just complete the discharge distribution of pumped storage electricity.

[0074] Similarly, we need to first obtain The value of , in this case, can also be determined by trial calculation , specifically:

[0075] First formulate an optimal water-solar-storage complementary output Calculate the pumped storage output according to formula (8) and accumulate the power ( It's about increasing function), if Increase the planned ,like Reduce the planned , and repeat the operation until the two are equal.

[0076] Optimal hydro-photovoltaic-storage complementary output , pumped storage power , pumped storage discharge output It is expressed as follows:

[0077] (6)

[0078] (7)

[0079] (8)

[0080] Where: To provide the best complementary power of water, light and storage; It is the set of time periods when the total water-light output is less than the channel capacity; for subset, indicating that pumped storage can be replenished to The time period collection; For pumped storage Internal output strategy; The reserves used for pumped storage during the dispatch period; is the discharge efficiency of the pumped storage power station.

[0081] Step S3: Calculate the grid-connected output process of the integrated hydropower, photovoltaic power station and pumped storage system based on the output process of ordinary hydropower, photovoltaic power station and pumped storage, and calculate the total grid-connected power and power abandonment rate of the system during the scheduling period accordingly.

[0082] In this embodiment, the power output process within the channel capacity is the online power output process (with photovoltaic power curtailment being given priority), and the total online power consumption and curtailment rate of the system are calculated based on this:

[0083] (9)

[0084] (10)

[0085] (11)

[0086] Where: They are ordinary hydropower, photovoltaic and pumped storage in the first Internet access output during the time period; 、 、 They are the total on-grid power of the system during the dispatch period (intraday) (power transmitted to the grid by the integrated hydro-solar-storage system), total power loss (direct photovoltaic power abandonment + pumped storage power loss), and photovoltaic power generation; is the power curtailment rate of the system during the dispatch period (total power curtailment / total power generation).

[0087] Example: Taking a hydropower, solar power, and 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. The power is transmitted through a single ±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.

[0088] Table 1 Characteristic parameters of integrated water-solar-storage system

[0089]

[0090] Taking the hourly inflow and photovoltaic output of a typical high-flow year (June 2003-May 2004), a typical normal-flow year (June 2013-May 2014), and a typical low-flow year (June 2006-May 2007) as input, as well as the daily water level and electricity allocated by medium- and long-term scheduling, the system's daily complementary operation process is obtained by successively carrying out hydro-photovoltaic complementary operation and secondary regulation of pumped storage.

[0091] Based on the obtained daily complementary operation process of the system, the two characteristic indicators of daily total online power and power curtailment 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 online power is about 1.21%, and the mean absolute percentage error of daily power curtailment 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 hydropower output combinations. Their daily output characteristics are shown in Table 2, which shows 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 low; 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 As shown in (d)–(f), when complementary operation occurs during the non-flood season, moderate average hydropower output effectively offsets PV output. However, as average hydropower output gradually increases, the maximum reservoir outflow during the non-flood season limits hydropower output regulation, forcing it to maintain high output during periods of high PV output, squeezing out PV output and increasing curtailment. In summary, the operational results obtained from this scheduling method effectively coordinate hydropower and pumped storage to offset PV fluctuations while satisfying the constraints, effectively simulating the short-term scheduling process of an 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 the integrated water, solar and storage system of the method is provided, comprising:

[0098] The hydropower output calculation module is used to determine the optimal hydropower and 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 and photovoltaic complementary output;

[0099] The pumped storage output calculation module is used to calculate the pumped storage energy absorption capacity by combining the channel capacity and the hydro-solar 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 on-grid output process of the integrated hydropower, photovoltaic power station and pumped storage system based on the output process of ordinary hydropower, photovoltaic power station and pumped storage, and based on this, calculate the total on-grid 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 in 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 additional 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 various embodiments of the present invention.

Claims

1. A short-term scheduling method for an integrated hydro-photovoltaic-storage system, characterized in that: The steps include: The optimal water-photovoltaic complementary output is determined based on the process of ordinary hydropower and photovoltaic output. The process of determining the optimal water-photovoltaic complementary output is as follows: first, an optimal water-photovoltaic complementary output is formulated. , calculate the ordinary hydropower output and accumulate the power ,like Increase the planned , Indicates the amount of electricity that needs to be allocated for ordinary hydropower. If Reduce the planned , cycle until the two are equal; optimal water-solar complementary output Expressed as: Where, Ordinary hydropower can be added to The set of time periods, that is ; For ordinary hydropower Output strategy, ; In determining the optimal water-solar complementary output Then, the output process of ordinary hydropower under complementary operation is deduced based on the optimal hydro-photovoltaic complementary output; the output process of ordinary hydropower under complementary operation is expressed as: Where, To contribute to the optimal water-light complementarity; They are ordinary hydropower and photovoltaic power stations in the first Output during the time period; It is the lower limit of ordinary hydropower output; This is the upper limit of ordinary hydropower output; is the number of time periods in the scheduling period; Combine the channel capacity and the hydro-photovoltaic output process to solve the pumped storage energy absorption capacity, and distribute the discharge according to the obtained pumped storage energy absorption capacity; including: first formulate an optimal hydro-photovoltaic storage complementary output , calculate the pumped storage output and accumulate the electricity ,like , then increase the proposed , Indicates the amount of electricity absorbed by pumped storage. If Reduce the planned , the cycle operation is continued until the two are equal; among them, the optimal water-solar-storage complementary output Expressed as: Where, To provide the best complementary power of water, light and storage; It is the set of time periods when the total water-light output is less than the channel capacity; for subset, indicating that pumped storage can be replenished to The time period collection; For pumped storage Internal output strategy; 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 for a water-solar-storage integrated system according to claim 1, characterized in that: The optimal hydropower-photovoltaic complementary output is determined based on the conventional hydropower and photovoltaic output processes. Based on the optimal hydropower-photovoltaic complementary output, the conditions that must be met for the conventional hydropower output process under complementary operation are as follows: after the system power is bundled and transmitted, it relies on the energy storage device to continue to regulate to meet the load. At this time, the system dispatch 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 supplement 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 power distribution.

3. The short-term scheduling method for a water-solar-storage integrated system according to claim 1, characterized in that: The channel capacity and the hydropower output process are combined to solve the pumped storage energy absorption capacity, and discharge distribution is performed according to the obtained pumped storage energy absorption capacity. The goal is to minimize power abandonment and supplement the period of low hydropower output to make the total output process relatively uniform.

4. The short-term scheduling method for a water-solar-storage integrated system according to claim 3, characterized in that: The method of combining the channel capacity with the hydro-solar output process to solve the pumped storage energy absorption capacity includes: First, calculate the power absorption process. When the total hydropower output 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: For pumped storage power station Output during a period, positive value indicates discharge, negative value indicates charge; is the channel capacity; Installed capacity for pumped storage power stations; For pumped storage power station The upper limit of the output absorbed during the period is determined by the upper limit of reserves and the remaining output space; It is the set of time periods when the total output of water and light is greater than the channel capacity.

5. The short-term scheduling method for a water-solar-storage integrated system according to claim 1, characterized in that: The total on-grid power of the system during the scheduling period is expressed as: Where, is the total on-grid power of the system during the dispatch period; They are ordinary hydropower, photovoltaic and pumped storage in the first Internet access output during the time period.

6. The short-term scheduling method for a water-solar-storage integrated system according to claim 1, characterized in that: The power curtailment rate of the system during the dispatch period is expressed as: Where, is the power curtailment rate of the system during the dispatch period, They are ordinary hydropower, photovoltaic and pumped storage in the first Internet access output during the time period; 、 They represent the total power loss and photovoltaic power generation of the system during the scheduling period respectively.

7. A scheduling system for the method according to any one of claims 1 to 6, characterized in that: include: The hydropower output calculation module is used to determine the optimal hydropower and 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 and photovoltaic complementary output; The pumped storage output calculation module is used to calculate the pumped storage energy absorption capacity by combining the channel capacity and the hydro-solar 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 on-grid output process of the integrated hydropower, photovoltaic power station and pumped storage system based on the output process of ordinary hydropower, photovoltaic power station and pumped storage, and based on this, calculate the total on-grid power and power abandonment rate of the system during the scheduling period.

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