A method and system for optimizing the scale of a regional interconnection channel considering system regulation capacity

Abstract

A method and system for optimizing the scale of regional mutual aid channels considering system regulation capabilities are disclosed. The method includes the following steps: acquiring energy data for the regions to be interconnected in the planning year; performing a power balance calculation for the regions to be interconnected in the planning year to obtain the thermal power output and renewable energy curtailment situation; for each moment in the planning year, determining whether there is renewable energy curtailment on one side and reduced thermal power output on the other side in the regions to be interconnected at the same time; if so, obtaining the power transmission direction and transmission power at that moment; otherwise, the transmission power at that moment is zero; calculating the cumulative exchangeable electricity in the planning year based on the transmission power, constructing and solving a regional mutual aid channel scale calculation model to obtain the scale of the regional mutual aid channel. This invention can promote the scientific optimization of the scale of inter-regional mutual aid projects and improve the efficiency of cross-regional energy resource allocation.

Description

Technical Field

[0001] This invention relates to the field of power system planning technology, and in particular to a method and system for optimizing the scale of regional mutual aid channels that takes into account the system's regulation capacity. Background Technology

[0002] Currently, the scale of regional mutual aid channels only considers the power surplus of the two regions to be interconnected, without fully utilizing the thermal power regulation capacity of the regions to be interconnected. In order to promote the absorption of clean energy curtailment rate in the regions to be interconnected, thereby reducing the amount of curtailed power, there is an urgent need for a method to optimize the scale of regional mutual aid channels that takes into account the system regulation capacity. Summary of the Invention

[0003] This invention provides a method and system for optimizing the scale of regional mutual aid channels that takes into account the system's adjustment capability, in order to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: This invention provides a method for optimizing the size of regional mutual aid channels considering system regulation capabilities, comprising the following steps: S1. Obtain energy data for the region to be interconnected in the planning year; S2. Plan the annual power balance of the region to be interconnected to obtain the thermal power output and renewable energy curtailment of the region to be interconnected. S3. For each moment in the planning year, determine whether there is a situation where one side of the region to be interconnected has new energy curtailment and the other side can reduce the output of thermal power units. If so, use the thermal power output and new energy curtailment situation of the region to be interconnected to output the power transmission direction and transmission power at this moment. Otherwise, the transmission power at this moment is zero. Among them, the output of compressible thermal power units refers to the thermal power output of the i-th region at time t being greater than the minimum technical output of the i-th region at time t. S4. Calculate the planned annual cumulative exchangeable electricity based on the transmission power, then construct a regional mutual aid channel scale calculation model using the planned annual cumulative exchangeable electricity and the scale of the regional mutual aid channel, and then solve the regional mutual aid channel scale through the regional mutual aid channel scale calculation model to obtain the regional mutual aid channel scale.

[0005] Furthermore, step S1 specifically includes the following steps: S11. Obtain the installed capacity of various power sources in the planning year for the areas to be interconnected, including the installed capacity of hydropower, thermal power, wind power, photovoltaic power, and energy storage in the planning year; the areas to be interconnected include the first area and the second area. S12. Obtain the power output curves of hydropower, wind power and photovoltaic power in the planning year of the area to be interconnected, and obtain the minimum operating scale of thermal power, minimum technical output of thermal power and output range of thermal power in the planning year of the area to be interconnected; among them, the minimum technical output of thermal power is the minimum power generation capacity of thermal power generating units for safe and stable operation. S13. Obtain the load characteristic curves of the areas to be interconnected in the planning year. .

[0006] Furthermore, the minimum operating capacity of thermal power plants in S12 satisfies the following relationship: ; in, Let i represent the thermal power installed capacity of region i in the planning year, where i=1,2; This represents the thermal power plant operating scale of region i at time t; This represents the minimum operating capacity of thermal power plants in region i at time t. ; The formula for calculating the minimum technical output of thermal power in S12 is as follows: ; in, This represents the minimum technical output of thermal power at time t within the i-th region; Indicates the minimum technical output coefficient; The thermal power output range in S12 is: ; in, Let be the thermal power output of region i at time t.

[0007] Furthermore, step S2 specifically includes the following steps: S21. First, plan the annual power balance of the first region within the interconnection area to obtain the thermal power output of the first region. Then, based on the thermal power output of the first region The calculation of the renewable energy curtailment situation in the first region was obtained. ; S22. Plan the annual power balance of the second region within the interconnection area to obtain the thermal power output of the second region. Then, based on the thermal power output of the second region The calculation of renewable energy curtailment in the second region was obtained. .

[0008] Furthermore, the formula for calculating the thermal power output in S2 is: ; in, This represents the hydropower output curve of region i in the planning year; This represents the wind power output curve for region i in the planning year; This represents the photovoltaic output curve of region i in the planning year; Let be the output of the energy storage unit at time t. The output range of the energy storage unit at time t is: , ; The formula for calculating the curtailment of renewable energy in S2 is as follows: ; in, This represents the situation of renewable energy curtailment in region i.

[0009] Furthermore, step S3 specifically includes the following steps: S31. For each moment of the planning year, determine whether there is new energy curtailment in the first region and compressible thermal power unit output in the second region at the same moment. If so, output the power transmission direction at the current moment based on the thermal power output and new energy curtailment situation in the two regions, and then calculate the transmission power at the current moment. Among them, the output of compressible thermal power units refers to the thermal power output of the i-th region at time t being greater than the minimum technical output of the i-th region at time t. S32. For each moment in the planning year, determine whether there is a second region with renewable energy curtailment and a first region with compressible thermal power unit output at the same moment. If so, output the power transmission direction at the current moment based on the thermal power output and renewable energy curtailment situation in the two regions, and calculate the transmission power at the current moment. S33. If neither exists, then no power transfer occurs between the two regions, and the output power transfer is zero.

[0010] Furthermore, the fact that the first region in S31 has abandoned renewable energy and the second region has compressible thermal power unit output can be expressed by the following formula: ; in, This refers to the first region where renewable energy is being curtailed. This represents the minimum technical output of thermal power at time t in the second region; The formula for calculating the transmission power at time t in S31 is: ; In S32, the second region has renewable energy curtailment, and the first region has compressible thermal power unit output, which can be expressed by the following formula: ; in, This refers to the second region where renewable energy is being curtailed. This represents the minimum technical output of thermal power plants at time t within the first region; The formula for calculating the transmission power at time t in S32 is: .

[0011] Furthermore, the formula for calculating the planned annual cumulative exchangeable electricity in S4 is as follows: ; in, This indicates the cumulative exchangeable electricity volume for the planned year.

[0012] Furthermore, the expression for the regional mutual aid channel scale calculation model in S4 is as follows: ; in, This represents the transmission power required to meet the set requirements within the planned year, where K is the scale of the regional mutual aid channel; the set requirements are specifically expressed by the following formula: ; Transmission power at time t When the size of the regional mutual aid channel is less than or equal to the size K, = Transmission power at time t When the size is greater than the regional mutual aid channel size K, = .

[0013] In another aspect, the present invention provides a regional mutual aid channel size optimization system that takes into account the system's adjustment capability, configured to execute a regional mutual aid channel size optimization method that takes into account the system's adjustment capability.

[0014] The beneficial effects of this invention are: 1. This invention proposes a method for optimizing the scale of regional mutual assistance channels that considers the system's regulation capacity. By considering the curtailment of renewable energy in one region and the reduction of thermal power unit output in the other, the power generation of thermal power can be reduced, thereby lowering energy costs and promoting the consumption of clean energy, reducing the curtailment rate of renewable energy. At the same time, it can help select a reasonable channel construction scale, which has guiding significance for regional mutual assistance planning and is of great significance for the development of new power systems.

[0015] 2. The regional mutual aid channel scale optimization method in this invention can promote the scientific optimization of the scale of inter-regional mutual aid projects, improve the efficiency of cross-regional energy resource allocation, enhance the energy security guarantee capability under the new power system, and provide strong technical support for building a clean, low-carbon, safe and efficient modern energy system. Attached Figure Description

[0016] Figure 1 This is a flowchart of the method for optimizing the scale of regional mutual aid channels in this invention; Figure 2 This is a schematic diagram illustrating the situation of renewable energy curtailment in region A of this invention. Figure 3 This is a schematic diagram illustrating the situation of renewable energy curtailment in region B of this embodiment of the invention; Figure 4 This is a schematic diagram of the power transmission direction and transmission power of regions A and B in the planned year in an embodiment of the present invention. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] Reference Figure 1 This application provides a method for optimizing the size of regional mutual aid channels that considers the system's adjustment capability, including the following steps: S1. Obtain energy data for the region to be interconnected in the planning year; the energy data for the planning year includes the installed capacity of various power sources in the planning year, as well as the output curves of hydropower, wind power and photovoltaic, and also includes the minimum operating capacity and minimum technical output of thermal power, and the load characteristic curve of the planning year. S2. Plan the annual power balance of the region to be interconnected to obtain the thermal power output and renewable energy curtailment of the region to be interconnected. S3. For each moment in the planning year, determine whether there is a situation where one side of the region to be interconnected has new energy curtailment and the other side can reduce the output of thermal power units. If so, use the thermal power output and new energy curtailment situation of the region to be interconnected to output the power transmission direction and transmission power at this moment. Otherwise, the transmission power at this moment is zero. Among them, the output of compressible thermal power units refers to the thermal power output of the i-th region at time t being greater than the minimum technical output of the i-th region at time t. S4. Calculate the planned annual cumulative exchangeable electricity based on the transmission power, then construct a regional mutual aid channel scale calculation model using the planned annual cumulative exchangeable electricity and the scale of the regional mutual aid channel, and then solve the regional mutual aid channel scale through the regional mutual aid channel scale calculation model to obtain the regional mutual aid channel scale.

[0020] In some embodiments, S1 specifically includes the following steps: S11. Obtain the installed capacity of various power sources in the planned year for the areas to be interconnected, including the installed capacity of hydropower in the planned year for the areas to be interconnected. Thermal power installed capacity Wind power installed capacity Photovoltaic installed capacity Energy storage installed capacity The areas to be interconnected include the first area and the second area. S12. Obtain the power output curves of hydropower, wind power and photovoltaic power in the planning year of the area to be interconnected, and obtain the minimum operating scale of thermal power, minimum technical output of thermal power and output range of thermal power in the planning year of the area to be interconnected; among them, the minimum technical output of thermal power is the minimum power generation capacity of thermal power generating units for safe and stable operation. S13. Obtain the load characteristic curves of the areas to be interconnected in the planning year. .

[0021] In some embodiments, the minimum operating capacity of thermal power plants in S12 satisfies the following relationship: ; in, Let i represent the thermal power installed capacity of region i in the planning year, where i=1,2; This represents the thermal power plant operating scale of region i at time t; This represents the minimum operating capacity of thermal power plants in region i at time t. ; The formula for calculating the minimum technical output of thermal power in S12 is as follows: ; in, This represents the minimum technical output of thermal power at time t within the i-th region; Indicates the minimum technical output coefficient; The thermal power output range in S12 is: ; in, Let be the thermal power output of region i at time t.

[0022] In some embodiments, S2 specifically includes the following steps: S21. First, plan the annual power balance of the first region within the interconnection area to obtain the thermal power output of the first region. Then, based on the thermal power output of the first region The calculation of the renewable energy curtailment situation in the first region was obtained. ; S22. Plan the annual power balance of the second region within the interconnection area to obtain the thermal power output of the second region. Then, based on the thermal power output of the second region The calculation of renewable energy curtailment in the second region was obtained. .

[0023] In some embodiments, the formula for calculating the thermal power output in S2 is: ; in, Let represent the hydropower output curve of region i in the planning year, and satisfy ... ; Let represent the wind power output curve of region i in the planning year, and satisfy ... ; Let represent the photovoltaic output curve of region i in the planning year, and satisfy ... ; Let represent the energy storage output curve of region i in the planning year, and satisfy ... ; The output range of the energy storage unit at time t is: , ; The formula for calculating the curtailment of renewable energy in S2 is as follows: ; in, This represents the situation of renewable energy curtailment in region i.

[0024] In some embodiments, S3 specifically includes the following steps: S31. For each moment of the planning year, determine whether there is new energy curtailment in the first region and compressible thermal power unit output in the second region at the same moment. If so, output the power transmission direction at the current moment based on the thermal power output and new energy curtailment situation in the two regions, and then calculate the transmission power at the current moment. Among them, the output of compressible thermal power units refers to the thermal power output of the i-th region at time t being greater than the minimum technical output of the i-th region at time t. S32. For each moment in the planning year, determine whether there is a second region with renewable energy curtailment and a first region with compressible thermal power unit output at the same moment. If so, output the power transmission direction at the current moment based on the thermal power output and renewable energy curtailment situation in the two regions, and calculate the transmission power at the current moment. S33. If neither exists, then no power transfer occurs between the two regions, and the output power transfer is zero.

[0025] In some embodiments, the first region in S31 has renewable energy curtailment, and the second region has compressible thermal power unit output, which can be expressed by the following expression: ; in, This refers to the first region where renewable energy is being curtailed. This represents the minimum technical output of thermal power at time t in the second region; The formula for calculating the transmission power at time t in S31 is: ; In S32, the second region has renewable energy curtailment, and the first region has compressible thermal power unit output, which can be expressed by the following formula: ; in, This refers to the second region where renewable energy is being curtailed. This represents the minimum technical output of thermal power plants at time t within the first region; The formula for calculating the transmission power at time t in S32 is: .

[0026] In some embodiments, the formula for calculating the planned annual cumulative exchangeable electricity in S4 is: ; in, This indicates the cumulative exchangeable electricity volume for the planned year.

[0027] In some embodiments, the expression for the regional mutual aid channel scale calculation model in S4 is: ; in, K represents the transmission power required to meet the set requirements within the planned year, and K is the scale of the regional mutual aid channel. Considering the scale of a single back-to-back converter in actual engineering, the value of the scale K of the regional mutual aid channel usually satisfies: K=150n, where n is a positive integer.

[0028] The specific requirements are expressed by the following formula: ; Transmission power at time t When the size of the regional mutual aid channel is less than or equal to the size K, = Transmission power at time t When the size is greater than the regional mutual aid channel size K, = .

[0029] The following example illustrates a method for optimizing the size of regional mutual aid channels that considers the system's adjustment capability, as described in this invention: Taking the 2030 interconnection project corridor scale of regions A and B as an example; regions A and B are considered as areas to be interconnected; By conducting a power balance analysis of Region A for the planned year of 2030, a schematic diagram of the renewable energy curtailment situation in Region A is obtained, as shown below. Figure 2 As shown; a schematic diagram illustrating the curtailment of renewable energy in region B is obtained by performing a power balance analysis for the planned year 2030. Figure 3 As shown; Then, for each moment of the planning year, determine whether region A and region B at any given moment experience renewable energy curtailment while the other can reduce the output of thermal power units, thus obtaining the annual power transmission direction and transmission power. See details... Figure 4 As shown; Based on the transmission power, the planned annual cumulative exchangeable electricity is calculated. Then, the scale of the regional mutual aid channel is constructed and solved using the planned annual cumulative exchangeable electricity and the scale of the regional mutual aid channel. The relevant data shown in Table 1 is obtained. By observing Table 1, it can be seen that it is more appropriate to consider the scale of the regional mutual aid channel K as 3 million kilowatts.

[0030] Table 1: Planned Annual Cumulative Exchangeable Electricity Transmission for Regions A and B under Different Region Inter-regional Transfer Channel Scales; In another aspect, the present invention provides a regional mutual aid channel size optimization system that takes into account the system's adjustment capability, configured to execute a regional mutual aid channel size optimization method that takes into account the system's adjustment capability.

[0031] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for optimizing the size of regional mutual aid channels considering system regulation capacity, characterized in that, Includes the following steps: S1. Obtain energy data for the region to be interconnected in the planning year; S2. Plan the annual power balance of the region to be interconnected to obtain the thermal power output and renewable energy curtailment of the region to be interconnected. S3. For each moment in the planning year, determine whether there is a situation where one side of the region to be interconnected has new energy curtailment and the other side can reduce the output of thermal power units. If so, use the thermal power output and new energy curtailment situation of the region to be interconnected to output the power transmission direction and transmission power at this moment. Otherwise, the transmission power at this moment is zero. Among them, the output of compressible thermal power units refers to the thermal power output of the i-th region at time t being greater than the minimum technical output of the i-th region at time t. S4. Calculate the planned annual cumulative exchangeable electricity based on the transmission power, then construct a regional mutual aid channel scale calculation model using the planned annual cumulative exchangeable electricity and the scale of the regional mutual aid channel, and then solve the regional mutual aid channel scale through the regional mutual aid channel scale calculation model to obtain the regional mutual aid channel scale.

2. The method for optimizing the scale of regional mutual aid channels considering system adjustment capability according to claim 1, characterized in that, S1 specifically includes the following steps: S11. Obtain the installed capacity of various power sources in the planning year for the areas to be interconnected, including the installed capacity of hydropower, thermal power, wind power, photovoltaic power, and energy storage in the planning year; the areas to be interconnected include the first area and the second area. S12. Obtain the power output curves of hydropower, wind power and photovoltaic power in the planning year of the area to be interconnected, and obtain the minimum operating scale of thermal power, minimum technical output of thermal power and output range of thermal power in the planning year of the area to be interconnected; among them, the minimum technical output of thermal power is the minimum power generation capacity of thermal power generating units for safe and stable operation. S13. Obtain the load characteristic curves of the areas to be interconnected in the planning year. .

3. The method for optimizing the scale of regional mutual aid channels considering system regulation capability according to claim 2, characterized in that, The minimum operating capacity of thermal power plants in S12 satisfies the following relationship: ； in, Let i represent the thermal power installed capacity of region i in the planning year, where i=1,2; This represents the thermal power plant operating scale of region i at time t; This represents the minimum operating capacity of thermal power plants in region i at time t. ; The formula for calculating the minimum technical output of thermal power in S12 is as follows: ； in, This represents the minimum technical output of thermal power at time t within the i-th region; Indicates the minimum technical output coefficient; The thermal power output range in S12 is: ； in, Let be the thermal power output of region i at time t.

4. The method for optimizing the scale of regional mutual aid channels considering system adjustment capability according to claim 3, characterized in that, S2 specifically includes the following steps: S21. First, plan the annual power balance of the first region within the interconnection area to obtain the thermal power output of the first region. Then, based on the thermal power output of the first region The calculation of the renewable energy curtailment situation in the first region was obtained. ; S22. Plan the annual power balance of the second region within the interconnection area to obtain the thermal power output of the second region. Then, based on the thermal power output of the second region The calculation of renewable energy curtailment in the second region was obtained. .

5. The method for optimizing the size of regional mutual aid channels considering system regulation capability according to claim 4, characterized in that, The formula for calculating the thermal power output in S2 is: ； in, This represents the hydropower output curve of region i in the planning year; This represents the wind power output curve for region i in the planning year; This represents the photovoltaic output curve of region i in the planning year; Let be the output of the energy storage unit at time t. The output range of the energy storage unit at time t is: ， ； The formula for calculating the curtailment of renewable energy in S2 is as follows: ； in, This represents the situation of renewable energy curtailment in region i.

6. The method for optimizing the scale of regional mutual aid channels considering system adjustment capability according to claim 5, characterized in that, S3 specifically includes the following steps: S31. For each moment of the planning year, determine whether there is new energy curtailment in the first region and compressible thermal power unit output in the second region at the same moment. If so, output the power transmission direction at the current moment based on the thermal power output and new energy curtailment situation in the two regions, and then calculate the transmission power at the current moment. Among them, the output of compressible thermal power units refers to the thermal power output of the i-th region at time t being greater than the minimum technical output of the i-th region at time t. S32. For each moment in the planning year, determine whether there is a second region with renewable energy curtailment and a first region with compressible thermal power unit output at the same moment. If so, output the power transmission direction at the current moment based on the thermal power output and renewable energy curtailment situation in the two regions, and calculate the transmission power at the current moment. S33. If neither exists, then no power transfer occurs between the two regions, and the output power transfer is zero.

7. The method for optimizing the size of regional mutual aid channels considering system regulation capability according to claim 6, characterized in that, In S31, the first region has abandoned renewable energy, and the second region has compressible thermal power unit output, which can be expressed by the following formula: ； in, This refers to the first region where renewable energy is being curtailed. This represents the minimum technical output of thermal power at time t in the second region; The formula for calculating the transmission power at time t in S31 is: ； In S32, the second region has renewable energy curtailment, and the first region has compressible thermal power unit output, which can be expressed by the following formula: ； in, This refers to the fact that there is abandoned renewable energy in the second region; This represents the minimum technical output of thermal power plants at time t within the first region; The formula for calculating the transmission power at time t in S32 is: 。 8. The method for optimizing the size of regional mutual aid channels considering system regulation capability according to claim 7, characterized in that, The formula for calculating the planned annual cumulative exchangeable electricity volume in S4 is as follows: ； in, This indicates the cumulative exchangeable electricity volume for the planned year.

9. A method for optimizing the scale of regional mutual aid channels considering system regulation capability according to claim 8, characterized in that, The expression for the regional mutual aid channel scale calculation model in S4 is as follows: ； in, This represents the transmission power required to meet the set requirements within the planned year, where K is the scale of the regional mutual aid channel; the set requirements are specifically expressed by the following formula: ； Transmission power at time t When the size of the regional mutual aid channel is less than or equal to the size K, = Transmission power at time t When the size is greater than the regional mutual aid channel size K, = .

10. A regional mutual aid channel scale optimization system considering system adjustment capability, characterized in that, It is configured to perform a method for optimizing the size of regional mutual aid channels that takes into account the system's adjustment capability, as described in any one of claims 1 to 9.

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