Water-light complementary operation method and system for large-scale peak and frequency modulation hydraulic power plant

Abstract

The method comprises the steps that a photovoltaic power station is connected to a hydropower station to serve as an additional unit of the hydropower station, and the photovoltaic power station is combined with the hydropower station to serve as a water-light complementary power station to receive dispatching of a power grid; constructing an operation strategy of the water-light complementary power station; and according to the actual operation state of the water-light complementary power station, selecting preset time period data, and performing operation analysis according to the operation strategy to obtain an analysis result. The photovoltaic output power quality is greatly improved, and the photovoltaic output power quality is more stable and reliable and can be easily accepted and absorbed by a power grid. And in the peak regulation capability, the hydropower supply capacity is ensured, the photoelectric supply electric quantity is sufficient, and the system has the good peak regulation capability.

Description

Technical Field

[0001] The present invention relates to the technical field of clean energy multi-energy complementation, and in particular to a water-light complementary operation method and system for a large-scale peak-shaving and frequency-regulating hydropower plant. Background Art

[0002] With the widespread application of renewable energy, photovoltaic power generation has developed rapidly due to its clean and low-carbon characteristics. However, the intermittent and unstable nature of photovoltaic power generation has brought challenges to the stable operation of the power grid. For example, voltage fluctuation: Since photovoltaic power generation is affected by sunshine conditions, the power generation fluctuates with weather changes, which may lead to unstable grid voltage, especially in areas where the proportion of photovoltaic power generation connected to the grid is high. This voltage fluctuation may affect the normal operation of other electrical equipment in the grid. Difficult frequency regulation: The photovoltaic power generation system does not have the inertia of traditional generator sets and cannot adjust the grid frequency like traditional generators. When the grid load changes, the photovoltaic power generation system cannot provide the necessary frequency support, which may cause grid frequency fluctuations. Complex grid planning and scheduling: After large-scale photovoltaic power generation is connected to the grid, the power grid company needs to re-plan the grid structure and scheduling strategy to adapt to the randomness and unpredictability of photovoltaic power generation. This increases the complexity and cost of grid operation. Reverse power flow problem: Photovoltaic power generation usually generates electricity during the day, when the grid load is relatively low, which may cause the electricity generated by photovoltaic power generation to be transmitted back to the grid, causing changes in the direction of the power flow, which brings challenges to the protection and operation control of the grid. Impact on the grid protection system: The grid connection of photovoltaic power generation may affect the protection system of the grid, such as overvoltage protection, overcurrent protection, etc., and the existing protection strategy needs to be adjusted to adapt to the characteristics of photovoltaic power generation. Power market and trading mechanism: The instability of photovoltaic power generation requires that the power market and trading mechanism can adapt to the characteristics of renewable energy, including the establishment of a flexible power trading mechanism and the promotion of clean energy consumption. Increased demand for energy storage: In order to alleviate the intermittent and instability of photovoltaic power generation, it is necessary to increase energy storage facilities to store excess electricity and release it when needed to balance the supply and demand of the grid. Impact of climate disasters: Extreme climate and natural disasters may cause damage to distributed photovoltaic facilities, affect the safe and stable operation of the power grid, and increase the complexity of maintenance and repair. Hydropower stations have the ability to load peak and frequency, which can complement photovoltaic power stations and improve the stability and economy of the power grid.

[0003] Hydropower complementarity is an energy supply model that combines photovoltaic power generation and hydropower generation. It aims to use the regulation capacity of hydropower stations to smooth the volatility and randomness of photovoltaic power generation, thereby providing a safe, stable and green energy source. Hydropower complementarity uses the effective regulation capacity of hydropower stations to quickly adjust the output of units according to changes in photovoltaic power generation to ensure the continuity and stability of power supply. This complementary model is of great significance for promoting the grid connection and consumption of photovoltaic power generation and optimizing the national energy structure. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the present invention proposes a water-photovoltaic complementary operation method for a large-scale peak-shaving and frequency-regulating hydropower plant, which combines the intermittent nature of photovoltaic power generation and the adjustability of hydropower, balances the fluctuations of photovoltaic power generation through the adjustment capacity of the hydropower station, and achieves more stable and predictable power output.

[0006] Another object of the present invention is to provide a water-photovoltaic complementary operation system for a large-scale peak-shaving and frequency-regulating hydropower plant.

[0007] A third object of the present invention is to provide a computer device.

[0008] A fourth object of the present invention is to provide a non-transitory computer-readable storage medium.

[0009] To achieve the above-mentioned purpose, the present invention proposes, on one hand, a method for water-photovoltaic complementary operation of a large-scale peak-shaving and frequency-regulating hydropower plant, comprising:

[0010] Connect the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and combine it with the hydropower station as a water-photovoltaic complementary power station to be dispatched by the power grid;

[0011] Constructing the operation strategy of the hydro-photovoltaic complementary power station;

[0012] According to the actual operation status of the hydro-photovoltaic complementary power station, data of a preset time period is selected to perform operation analysis according to the operation strategy to obtain analysis results.

[0013] The water-photovoltaic complementary operation method of a large-scale peak-shaving and frequency-regulating hydropower plant according to the embodiment of the present invention may also have the following additional technical features:

[0014] In one embodiment of the present invention, the mathematical model of the operation strategy is:

[0015] P Gn =0,P Sn =(P n-1 -P Sn-1 )+P Sn-1

[0016] P Gn ﹥O,P Sn =(P n-1 -P Gn-1 )

[0017] Among them, P n is the system output at time n; P Gn is the photovoltaic output at time n; P Sn is the power output of the hydropower station at time n.

[0018] In one embodiment of the present invention, the total installed capacity of the hydro-photovoltaic complementary power station is preset to be 2173MW, of which the hydropower installed capacity is 1670MW and the photovoltaic installed capacity is 503MW, the hydropower installed capacity accounts for 76.9% and the photovoltaic installed capacity accounts for 23.1%; through two 500kV and three 220kV voltage level transmission lines, it undertakes base load and frequency regulation, peak regulation and accident standby tasks in the system.

[0019] In one embodiment of the present invention, the analysis result includes:

[0020] During the sunshine period, the output curve of hydropower will change in an almost mirror image with the output curve of photovoltaic power to maintain the system output unchanged;

[0021] During the period without sunlight, the hydropower output curve maintains the system output level.

[0022] To achieve the above-mentioned purpose, the present invention proposes, on the other hand, a large-scale peak-shaving and frequency-regulating hydropower plant water-photovoltaic complementary operation system, comprising:

[0023] A water-photovoltaic complementary power station construction module is used to connect the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and combine it with the hydropower station as a water-photovoltaic complementary power station to accept the dispatch of the power grid;

[0024] Operation strategy building module, used to build the operation strategy of the hydro-photovoltaic complementary power station;

[0025] The operation analysis module is used to select data of a preset period according to the actual operation status of the hydro-photovoltaic complementary power station and analyze the data according to the operation strategy to obtain the analysis result.

[0026] The large-scale peak-shaving and frequency-regulating hydropower plant water-photovoltaic complementary operation method and system of the embodiment of the present invention can quickly adjust the unit output according to the changes in photovoltaic power generation to ensure the continuity and stability of power supply.

[0027] To achieve the above-mentioned purpose, the third aspect embodiment of the present application proposes a computer device, including: a processor and a memory; wherein the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the water-light complementary operation method of a large-scale peak-shaving and frequency-regulating hydropower plant as described in the first aspect embodiment.

[0028] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes a non-temporary computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the water-light complementary operation method of a large-scale peak-shaving and frequency-regulating hydropower plant as described in the first aspect embodiment.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0031] Figure 1 is a flow chart of a water-photovoltaic complementary operation method for a large-scale peak-shaving and frequency-regulating hydropower plant according to an embodiment of the present invention;

[0032] Figure 2 This is a typical application scenario diagram of the operation of a water-photovoltaic complementary power station according to an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of hydropower and photovoltaic output (MW)-sunny day according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of hydropower and photovoltaic output (MW)-cloudy day according to an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of hydropower and photovoltaic output (MW)-rainy day according to an embodiment of the present invention;

[0036] Figure 6 2 is a schematic diagram of the structure of a water-light complementary operation system for a large-scale peak-shaving and frequency-regulating hydropower plant according to an embodiment of the present invention;

[0037] Figure 7 It is a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 should fall within the scope of protection of the present invention.

[0040] The following describes the water-photovoltaic complementary operation method, system, device and storage medium of a large-scale peak-shaving and frequency-regulating hydropower plant according to embodiments of the present invention with reference to the accompanying drawings.

[0041] Figure 1 is a flow chart of a water-light complementary operation method for a large-scale peak-shaving and frequency-regulating hydropower plant according to an embodiment of the present invention. Figure 1 As shown, the method includes but is not limited to the following steps:

[0042] S1: Connect the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and combine it with the hydropower station as a water-photovoltaic complementary power station to be dispatched by the power grid;

[0043] S2, construct the operation strategy of the water-solar complementary power station;

[0044] S3, according to the actual operation status of the hydro-photovoltaic complementary power station, select the data of the preset time period and perform operation analysis according to the operation strategy to obtain the analysis result.

[0045] like Figure 2 As shown in the figure, the total installed capacity of a hydropower-photovoltaic complementary power station is 2173MW, of which the hydropower installed capacity is 1670MW (1x120MW+5x250MW+1x300MW), and the photovoltaic installed capacity is 503MW (78MW of 35kV photovoltaic power station + 425MW of 220kV photovoltaic power station). The hydropower installed capacity accounts for 76.9% and the photovoltaic installed capacity accounts for 23.1%. They are mainly transmitted through two 500kV and three 220kV voltage level transmission lines, and are responsible for base load, frequency regulation, peak regulation and accident standby tasks in the system.

[0046] Specifically, the present invention connects the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and the photovoltaic power station and the hydropower station are dispatched by the power grid as a combined power source, and jointly participate in the peak load regulation and frequency regulation of the power grid.

[0047] Mathematical model of the operation strategy of the embodiment of the present invention:

[0048] P Gn =0,P Sn =(P n-1 -P Sn-1 )+P Sn-1

[0049] P Gn ﹥O,P Sn =(P n-1 -P Gn-1 )

[0050] Where: P n is the system output at time n; P Gn is the photovoltaic output at time n; P Sn is the power output of the hydropower station at time n.

[0051] Furthermore, according to the actual operation of the hydro-photovoltaic complementary power station, typical daily data are selected to perform operation analysis according to the operation strategy to obtain analysis results.

[0052] from Figure 3 , Figure 4 and Figure 5 It can be seen that (period / 15min), during the period of sunlight, the output curve of hydropower changes approximately in a mirror image with the output curve of photovoltaic power to maintain the system output unchanged; during the period of no sunlight, the output curve of hydropower maintains the system output level. The output of photovoltaic power fluctuates greatly on cloudy and rainy days. When the output of photovoltaic power fluctuates, hydropower quickly and accurately compensates photovoltaic power, greatly improving the power quality of photovoltaic power output, making it more stable and reliable, and easy for the grid to accept and absorb. In terms of peak-shaving capacity, hydropower provides capacity guarantee, photovoltaic power provides sufficient power, and the system has good peak-shaving capacity.

[0053] According to the large-scale peak-shaving and frequency-regulating hydropower plant water-photovoltaic complementary operation method of the embodiment of the present invention, the present invention greatly improves the quality of photovoltaic power output, making it more stable and reliable, and easy for the power grid to accept and absorb. In terms of peak-shaving capability, hydropower provides capacity guarantee, photovoltaic power provides sufficient power, and the system has good peak-shaving capability.

[0054] In order to implement the above embodiment, Figure 6 As shown, this embodiment also provides a large-scale peak-shaving and frequency-regulating hydropower plant water-light complementary operation system 10, including:

[0055] The water-photovoltaic complementary power station construction module 100 is used to connect the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and combine it with the hydropower station as a water-photovoltaic complementary power station to accept the dispatch of the power grid;

[0056] An operation strategy building module 200 is used to build an operation strategy for a water-solar complementary power station;

[0057] The operation analysis module 300 is used to select data of a preset period according to the actual operation status of the hydro-photovoltaic complementary power station, perform operation analysis according to the operation strategy, and obtain analysis results.

[0058] Furthermore, the mathematical model of the running strategy is:

[0059] P Gn =0,P Sn =(P n-1 -P Sn-1 )+P Sn-1

[0060] P Gn ﹥O,P Sn =(P n-1 -P Gn-1 )

[0061] Among them, P n is the system output at time n; P Gn is the photovoltaic output at time n; P Snis the power output of the hydropower station at time n.

[0062] Furthermore, the total installed capacity of the hydro-photovoltaic complementary power station is preset to be 2173MW, of which the hydropower installed capacity is 1670MW and the photovoltaic installed capacity is 503MW. The hydropower installed capacity accounts for 76.9% and the photovoltaic installed capacity accounts for 23.1%. Through two 500kV and three 220kV voltage level transmission lines, it undertakes base load and frequency regulation, peak regulation and accident standby tasks in the system.

[0063] Furthermore, the analysis results include:

[0064] During the sunshine period, the output curve of hydropower will change in an almost mirror image with the output curve of photovoltaic power to maintain the system output unchanged;

[0065] During the period without sunlight, the hydropower output curve maintains the system output level.

[0066] According to the large-scale peak-shaving and frequency-regulating hydropower plant water-photovoltaic complementary operation system of the embodiment of the present invention, the present invention greatly improves the power quality of photovoltaic output, making it more stable and reliable, and easy for the power grid to accept and absorb. In terms of peak-shaving capability, hydropower provides capacity guarantee, photovoltaic power provides sufficient power, and the system has good peak-shaving capability.

[0067] In order to implement the method of the above embodiment, the present invention also provides a computer device, such as Figure 7 As shown, the computer device 600 includes a memory 601 and a processor 602; wherein the processor 602 runs a program corresponding to the executable program code by reading the executable program code stored in the memory 601, so as to implement each step of the method described above.

[0068] In order to implement the above embodiments, the present application also proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in the above embodiments is implemented.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A method for water-light complementary operation of a large-scale peak-shaving and frequency-modulating hydropower plant, characterized in that: include: Connect the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and combine it with the hydropower station as a water-photovoltaic complementary power station to be dispatched by the power grid; Constructing the operation strategy of the hydro-photovoltaic complementary power station; According to the actual operation status of the hydro-photovoltaic complementary power station, data of a preset time period is selected to perform operation analysis according to the operation strategy to obtain analysis results.

2. The method according to claim 1, characterized in that Mathematical model of the operation strategy: P Gn =0,P Sn =(P n-1 -P Sn-1 )+P Sn-1 P Gn ﹥O,P Sn =(P n-1 -P Gn-1 ) Among them, P n is the system output at time n; P Gn is the photovoltaic output at time n; P Sn is the power output of the hydropower station at time n.

3. The method according to claim 1, characterized in that The total installed capacity of the pre-set hydro-photovoltaic complementary power station is 2173MW, of which hydropower installed capacity is 1670MW and photovoltaic installed capacity is 503MW. The hydropower installed capacity accounts for 76.9% and the photovoltaic installed capacity accounts for 23.1%. Through two 500kV and three 220kV voltage level transmission lines, it undertakes base load and frequency regulation, peak regulation and accident standby tasks in the system.

4. The method according to claim 2, characterized in that: The analysis results include: During the sunshine period, the output curve of hydropower will change in an almost mirror image with the output curve of photovoltaic power to maintain the system output unchanged; During the period without sunlight, the hydropower output curve maintains the system output level.

5. A large-scale peak-shaving and frequency-regulating hydropower plant water-photovoltaic complementary operation system, characterized in that: include: A water-photovoltaic complementary power station construction module is used to connect the photovoltaic power station to the hydropower station as an additional unit of the hydropower station, and combine it with the hydropower station as a water-photovoltaic complementary power station to accept the dispatch of the power grid; Operation strategy building module, used to build the operation strategy of the hydro-photovoltaic complementary power station; The operation analysis module is used to select data of a preset period according to the actual operation status of the hydro-photovoltaic complementary power station and analyze the data according to the operation strategy to obtain the analysis result.

6. The system according to claim 5, characterized in that Mathematical model of the operation strategy: P Gn =0,P Sn =(P n-1 -P Sn-1 )+P Sn-1 P Gn ﹥O,P Sn =(P n-1 -P Gn-1 ) Among them, P n is the system output at time n; P Gn is the photovoltaic output at time n; P Sn is the power output of the hydropower station at time n.

7. The system according to claim 5, characterized in that The total installed capacity of the pre-set hydro-photovoltaic complementary power station is 2173MW, of which hydropower installed capacity is 1670MW and photovoltaic installed capacity is 503MW. The hydropower installed capacity accounts for 76.9% and the photovoltaic installed capacity accounts for 23.1%. Through two 500kV and three 220kV voltage level transmission lines, it undertakes base load and frequency regulation, peak regulation and accident standby tasks in the system.

8. The system according to claim 6, characterized in that The analysis results include: During the sunshine period, the output curve of hydropower will change in an almost mirror image with the output curve of photovoltaic power to maintain the system output unchanged; During the period without sunlight, the hydropower output curve maintains the system output level.

9. A computer device, characterized in that: including a processor and a memory; The processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the water-light complementary operation method of a large-scale peak-shaving and frequency-regulating hydropower plant as described in any one of claims 1-4.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the water-light complementary operation method of a large-scale peak-shaving and frequency-regulating hydropower plant is implemented.

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