A new energy site optimization evaluation method and system

Abstract

A method and system for optimizing and evaluating new energy station sites, comprising: S1, specifying the appropriate new energy installed capacity and maximum transmission distance for each voltage level; S2, establishing an absorptive capacity evaluation model for the new energy station site, obtaining the voltage level corresponding to the new energy station site and storing it in a first set; S3, constructing a second set as required; if no substation meets the requirements, proceeding to S6, otherwise proceeding to S4; S4, adjusting the second set to obtain a third set; S5, determining whether the third set is an empty set, if so proceeding to S6, otherwise calculating the distance between each substation in the third set and the new energy station site, and then scoring the multiple distances; S6, selecting the next voltage level and repeating S3 to S5 to obtain a distance score; S7, iterating S6 to obtain a distance score for each voltage level, and calculating a suitability score and a comprehensive score. The present invention implements the optimization evaluation of new energy planning sites under the consideration of grid absorptivity.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy site selection, and in particular to a new energy site optimization evaluation method and system. Background Art

[0002] With the emergence of climate change and environmental problems, the development and utilization of new energy sources have received widespread attention from countries around the world. More and more countries have adopted policies and measures to encourage the development of new energy sources, and the production scale and application scope of new energy sources are constantly expanding.

[0003] Because renewable energy output is intermittent, volatile, and random, and the location of new energy power stations is affected by the distribution of wind and solar resources, areas where wind and solar resources are mismatched with the region's load and grid resources face challenges accommodating and transmitting new energy power stations. Currently, site assessments for planned stations largely rely on expert experience, but there is no unified and effective evaluation method, and this approach is labor-intensive and detrimental to the development of new energy. Summary of the Invention

[0004] The present invention provides a new energy site optimization evaluation method and system to solve the technical problems mentioned in the background technology.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] The present invention provides a new energy site optimization evaluation method, comprising the following steps:

[0007] S1. Specify the appropriate scale of renewable energy installations for each voltage level, and the maximum transmission distance for renewable energy at each voltage level;

[0008] S2. Establish a model for evaluating the absorption capacity of the selected new energy station site, obtain the voltage level corresponding to the selected new energy station site and store it in the first set ;

[0009] S3. For the first set Medium voltage level , with the selected new energy station site as the center, and the voltage level Corresponding maximum sending distance Draw a circle with the radius, select the substations with the voltage level within the circle and save them in the second set If there is no substation that meets the distance requirements, the voltage level is determined to be The corresponding distance score , and go to S6, otherwise go to S4;

[0010] S4. Consider whether the restriction of the substation main transformer capacity on the output of renewable energy is taken into account. Adjust and get the third set ;

[0011] S5. Determine the third set Is it an empty set? If so, the distance score Go to S6, otherwise calculate the third set The distance between each substation and the selected new energy station is calculated, and then the multiple distances are scored to obtain the voltage level. Distance score ;

[0012] S6. From the first set Select the next voltage level , and repeat S3 to S5 to get the next voltage level Distance score ;

[0013] S7, iterate S6 until the first set is obtained The distance score for each voltage level in the first set is then used The suitability score of the selected renewable energy site is calculated based on the distance score of each voltage level, and the comprehensive score of the selected renewable energy site is calculated based on the suitability score of the selected renewable energy site and the absorption capacity assessment model.

[0014] Furthermore, the S2 specifically includes the following steps:

[0015] S21. Evaluate and obtain the renewable energy curtailment rate of the surrounding power grid after the selected renewable energy site is put into operation;

[0016] S22. Using the new energy curtailment rate of the surrounding power grid after the selected new energy station site is put into operation, establish an absorptive capacity assessment model for the selected new energy station site, and use the absorptive capacity assessment model to assess the absorptive capacity of the selected new energy station site;

[0017] S23. Obtain the voltage level corresponding to the selected new energy station site and store it in the first set , , v n Indicates the nth voltage level.

[0018] Furthermore, the absorption capacity evaluation model is as follows:

[0019] (1)

[0020] in, represents the power abandonment rate, Indicates the consumption score, is the absorption scoring parameter.

[0021] Furthermore, the S4 specifically includes the following steps:

[0022] S41. First, determine whether the capacity of the substation main transformer is considered to limit the output of renewable energy. If so, proceed to S42; otherwise, proceed to S43.

[0023] S42, if the voltage level Less than the third set The maximum voltage level of the selected substation, then filter out the third set Substations with main transformer capacity less than the installed capacity of the selected new energy station site, and a substation set that meets the requirements , b m represents the mth substation that meets the requirements;

[0024] If the voltage level on the high-voltage side of the substation is less than or equal to the voltage level sent by the renewable energy source, ;

[0025] S43, Direct .

[0026] Furthermore, the S5 specifically includes the following steps:

[0027] S51. Determine the third set Is it an empty set? If so, go to S52, otherwise go to S53;

[0028] S52, determine the voltage level The corresponding distance score , and go to step S6;

[0029] S53. Calculate the third set The distance between each substation and the selected new energy station is constructed and a distance set is obtained. ,and , where d m Represents the distance between the mth substation and the selected new energy station site, and then the distance set Scoring multiple distances within the voltage level Distance score ,in 、 Represents the distance set The scores of the kth and mth distances in .

[0030] Furthermore, in S53 The distance score is calculated using the following formula:

[0031] (2)

[0032] in, Indicates new energy station site and substation the distance between them; is the shape parameter, The larger it is, the more convex the shape; Indicates the ratio of suitable sending distance to maximum sending distance; Indicates distance exist times When the score is within between; Indicates distance exist times to When the score is always between.

[0033] Furthermore, the calculation formulas for the suitability score in S7 are as follows:

[0034] (3)

[0035] Where, Score the suitability of the selected new energy station site for transmission, Represents the first set Medium voltage level v n distance score.

[0036] Furthermore, the calculation formulas for the comprehensive scores in S7 are as follows:

[0037] (4)

[0038] in, , is the comprehensive score of the selected new energy site, 、 are the weights of the absorptive capacity assessment model and suitability score, respectively.

[0039] Furthermore, the new energy site optimization evaluation method further includes:

[0040] S8. Use the comprehensive score to optimize multiple new energy station sites and obtain the required new energy station site.

[0041] Another aspect of the present invention provides a new energy site optimization evaluation system, including a computer device, which is programmed or configured to execute a new energy site optimization evaluation method.

[0042] Beneficial effects of the present invention:

[0043] 1. The present invention discloses a method for optimizing and evaluating new energy station sites, which comprehensively considers the power supply, load, power grid and site conditions of the regional new energy station site, and realizes the optimization evaluation of the planned new energy station site taking into account the grid absorption capacity and transmission suitability.

[0044] 2. The present invention also discloses a new energy site optimization evaluation system, which can realize automated preliminary evaluation of new energy planning sites. The evaluation data obtained from the automated preliminary evaluation can provide a reference for subsequent further planning work, and the use of the new energy site optimization evaluation system also improves the efficiency of planning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Flowchart of the new energy site optimization evaluation method in the present invention. DETAILED DESCRIPTION

[0046] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many other forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0047] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0048] Reference Figure 1 , the embodiment of the present application provides a new energy site optimization evaluation method, comprising the following steps:

[0049] S1. Specify the appropriate scale of renewable energy installations for each voltage level, and the maximum transmission distance for renewable energy at each voltage level;

[0050] S2. Establish a model for evaluating the absorption capacity of the selected new energy station site, obtain the voltage level corresponding to the selected new energy station site and store it in the first set ;

[0051] S3. Since different voltage levels allow different line lengths, increasing the line length will increase transmission losses, voltage drops and other indicators, reducing system stability. On the other hand, increasing the line length will increase line investment and reduce economic efficiency. Therefore, it is necessary to focus on the first set. Medium voltage level , with the selected new energy station site as the center, and the voltage level Corresponding maximum sending distance Draw a circle with the radius, select the substations with the voltage level within the circle and save them in the second set If there is no substation that meets the distance requirements, the voltage level is determined to be The corresponding distance score , and go to S6, otherwise go to S4;

[0052] S4. Consider whether the restriction of the substation main transformer capacity on the output of renewable energy is taken into account. Adjust and get the third set ;

[0053] S5. Determine the third set Is it an empty set? If so, determine the voltage level The corresponding distance score , and go to S6, otherwise calculate the third set The distance between each substation and the selected new energy station is calculated, and then the multiple distances are scored to obtain the voltage level. Distance score ;

[0054] S6. From the first set Select the next voltage level , and repeat S3 to S5 to get the next voltage level Distance score ;

[0055] S7, iterate S6 until the first set is obtained The distance score for each voltage level in the first set is then used The suitability score of the selected renewable energy site is calculated based on the distance score of each voltage level, and the comprehensive score of the selected renewable energy site is calculated based on the suitability score of the selected renewable energy site and the absorption capacity assessment model.

[0056] The present invention comprehensively considers the power supply, load, power grid and site conditions of the regional new energy station site, and realizes the optimal evaluation of the planned new energy station site taking into account the grid absorption condition.

[0057] In some embodiments, the step S2 specifically includes the following steps:

[0058] S21. Calculate and obtain the new energy curtailment rate of the surrounding power grid after the selected new energy station is put into operation;

[0059] S22. Using the new energy curtailment rate of the surrounding power grid after the selected new energy station site is put into operation, establish an absorptive capacity assessment model for the selected new energy station site, and use the absorptive capacity assessment model to assess the absorptive capacity of the selected new energy station site;

[0060] S23. Obtain the voltage level corresponding to the selected new energy station site and store it in the first set , , v n Indicates the nth voltage level.

[0061] In some embodiments, the absorption capacity assessment model is specifically as follows:

[0062] (1)

[0063] in, represents the power abandonment rate, Indicates the consumption score, is the absorption scoring parameter.

[0064] In some embodiments, the S4 specifically includes the following steps:

[0065] S41. First, determine whether the capacity of the substation main transformer is considered to limit the output of renewable energy. If so, proceed to S42; otherwise, proceed to S43.

[0066] S42, if the voltage level Less than the third set The maximum voltage level of the selected substation, then filter out the third set Substations with main transformer capacity less than the installed capacity of the selected new energy station site, and a substation set that meets the requirements , b m represents the mth substation that meets the requirements;

[0067] If the voltage level on the high-voltage side of the substation is equal to the voltage level sent by the renewable energy, then ;

[0068] S43, Direct .

[0069] In some embodiments, the step S5 specifically includes the following steps:

[0070] S51. Determine the third set Is it an empty set? If so, go to S52, otherwise go to S53;

[0071] S52, determine the voltage level The corresponding distance score , and go to step S6;

[0072] S53. Calculate the third set The distance between each substation and the selected new energy station is constructed and a distance set is obtained. ,and , where d m Represents the distance between the mth substation and the selected new energy station site, and then the distance set Scoring multiple distances within the voltage level Distance score ,in 、 Represents the distance set The scores of the kth and mth distances in .

[0073] In some embodiments, the S53 The distance score is calculated using the following formula:

[0074] (2)

[0075] in, Indicates new energy station site and substation the distance between them; is the shape parameter, The larger it is, the more convex the shape; Indicates the ratio of suitable sending distance to maximum sending distance; Indicates distance exist times When the score is within between; Indicates distance exist times to When the score is always between.

[0076] In some embodiments, the calculation formulas for the suitability score in S7 are as follows:

[0077] (3)

[0078] Where, Score the suitability of the selected new energy station site for transmission, Represents the first set Medium voltage level v n distance score.

[0079] In some embodiments, the calculation formulas for the comprehensive score in S7 are as follows:

[0080] (4)

[0081] in, , is the comprehensive score of the selected new energy site, 、 are the weights of the absorptive capacity assessment model and suitability score, respectively.

[0082] In some embodiments, the new energy site optimization evaluation method further includes:

[0083] S8. Use the comprehensive score to optimize multiple new energy station sites and obtain the required new energy station site.

[0084] To facilitate understanding, the following case study illustrates the specific process of the new energy site optimization evaluation method:

[0085] (1) Assuming that the initial installed capacity of a site is 160MW and the curtailment rate is calculated to be 5%, the absorption score is calculated according to formula (1): ;

[0086] (2) According to Table 1, the voltage levels can be selected as 110kV and 220kV, so the first set ;

[0087] Table 1: Voltage level adaptation scale table;

[0088]

[0089] (3) According to Table 2, select a substation with a voltage level of 110kV within 50km and a substation with a voltage level of 220kV within 100km. Assuming that the indicators of the substations selected within the range are as shown in Tables 3 and 4, then Among them, bdz refers to the substation;

[0090] Table 2: Maximum distance table for voltage levels;

[0091]

[0092] Table 3: Substations with a voltage level of 110kV within 50km;

[0093]

[0094] Table 4: Substations with a voltage level of 220kV within 100km;

[0095]

[0096] (4) Assuming that the capacity of all substations in this area is known, and the site selection assessment takes into account the impact of substation capacity, it is necessary to screen the substations in Table 1 or Tables 3 and 4 based on capacity. In the table, the capacity of bdz1 is 100MVA, which is less than the 160MW installed capacity of the site, but the voltage level of bdz1 is 110kV. The power of the site selection project does not need to be sent through the main transformer of bdz1, so the capacity of bdz1 has no impact and meets the requirements; the voltage level of bdz2 is 220kV, and the power of the site selection needs to be sent through the main transformer of bdz2. The capacity of bdz2 is 180MVA>160MVA, which meets the requirements; the voltage level of bdz3 is 220kV, but the capacity is 120MVA, which is less than the installed capacity of the site selection and does not meet the requirements. Similarly, bdz4 and bdz5 meet the requirements. .

[0097] (5) Score the distance to the substation according to formula (2) and Table 2. For B(1), r(1)=50km, G b (1)={0.8,0.8732}; for B(2), r(2)=100km, G b (2)={0.9449,0.8732,0.8}.

[0098] (6) According to formula (3) and formula (4), for the first set The distance scores of the two voltage levels are summed to obtain the suitability score of the selected new energy station site. If the weights of the consumption score and the delivery suitability score are 0.6 and 0.4 respectively, the comprehensive score .

[0099] In addition, it should be noted that when conducting actual site selection evaluations in different countries / regions, the values in the tables (Tables 1 to 4) and the parameters in the formulas (Formulas 1 to 4) need to be appropriately adjusted based on local actual conditions.

[0100] Another aspect of the present invention provides a new energy site optimization evaluation system, including a computer device, which is programmed or configured to execute a new energy site optimization evaluation method.

[0101] The new energy site optimization and evaluation system can realize the automated preliminary evaluation of new energy planning sites. The evaluation data obtained from the automated preliminary evaluation can provide a reference for subsequent further planning work; and the use of the new energy site optimization and evaluation system also improves the efficiency of planning work.

[0102] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. 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 protection scope required by the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A new energy site optimization evaluation method, characterized in that: The steps include: S1. Specify the appropriate scale of renewable energy installations for each voltage level, and the maximum transmission distance for renewable energy at each voltage level; S2. Establish a model for evaluating the absorption capacity of the selected new energy station site, obtain the voltage level corresponding to the selected new energy station site and store it in the first set ; S3. For the first set Medium voltage level , with the selected new energy station site as the center, and the voltage level Corresponding maximum sending distance Draw a circle with the radius, select the substations with the voltage level within the circle and save them in the second set ; If there is no substation that meets the distance requirement, the distance score , and go to S6, otherwise go to S4; S4. Consider whether the restriction of the substation main transformer capacity on the output of renewable energy is taken into account. Adjust and get the third set ; S5. Determine the third set Is it an empty set? If so, the distance score Go to S6, otherwise calculate the third set The distance between each substation and the selected new energy station is calculated, and then the multiple distances are scored to obtain the voltage level. Distance score ; S6. From the first set Select the next voltage level , and repeat S3 to S5 to get the next voltage level Distance score ; S7, iterate S6 until the first set is obtained The distance score for each voltage level in the first set is then used The suitability score is calculated based on the distance score of each voltage level, and the comprehensive score of the selected new energy site is calculated based on the suitability score of the selected new energy site and the absorption capacity assessment model.

2. The new energy site optimization evaluation method according to claim 1 is characterized in that: The S2 specifically includes the following steps: S21. Calculate and obtain the new energy curtailment rate of the surrounding power grid after the selected new energy station is put into operation; S22. Using the new energy curtailment rate of the surrounding power grid after the selected new energy station site is put into operation, establish an absorptive capacity assessment model for the selected new energy station site, and use the absorptive capacity assessment model to assess the absorptive capacity of the selected new energy station site; S23. Obtain the voltage level corresponding to the selected new energy station site and store it in the first set , , v n Indicates the nth voltage level.

3. The new energy site optimization evaluation method according to claim 2, characterized in that: The absorption capacity evaluation model is as follows: （1） in, represents the power abandonment rate, Indicates the consumption score, is the absorption scoring parameter.

4. The new energy site optimization evaluation method according to claim 3, characterized in that: The S4 specifically includes the following steps: S41. First, determine whether the capacity of the substation main transformer is considered to limit the output of renewable energy. If so, proceed to S42; otherwise, proceed to S43. S42, if the voltage level Less than the third set The maximum voltage level of the selected substation, then filter out the third set Substations with main transformer capacity less than the installed capacity of the selected new energy station site, and a substation set that meets the requirements , b m represents the mth substation that meets the requirements; If the voltage level on the high-voltage side of the substation is equal to the voltage level sent by the renewable energy, then ; S43, Direct .

5. The new energy site optimization evaluation method according to claim 4 is characterized in that: The S5 specifically includes the following steps: S51. Determine the third set Is it an empty set? If so, go to S52, otherwise go to S53; S52, determine the voltage level The corresponding distance score , and go to step S6; S53. Calculate the third set The distance between each substation and the selected new energy station is constructed and a distance set is obtained. ,and , where d m Represents the distance between the mth substation and the selected new energy station site, and then the distance set Scoring multiple distances within the voltage level Distance score ,in 、 Represents the distance set The scores of the kth and mth distances in .

6. The new energy site optimization evaluation method according to claim 5, characterized in that: The S53 The distance score is calculated using the following formula: （2） in, Indicates new energy station site and substation the distance between them; is the shape parameter, The larger it is, the more convex the shape; Indicates the ratio of suitable sending distance to maximum sending distance; Indicates distance exist times When the score is within between; Indicates distance exist times to When the score is always between.

7. The new energy site optimization evaluation method according to claim 6, characterized in that: The calculation formulas for the suitability scores in S7 are as follows: （3） Where, Score the suitability of the selected new energy station site for transmission, Represents the first set Medium voltage level v n distance score.

8. The new energy site optimization evaluation method according to claim 7, characterized in that: The calculation formulas for the comprehensive scores in S7 are as follows: （4） in, , is the comprehensive score of the selected new energy site, 、 are the weights of the absorptive capacity assessment model and suitability score, respectively.

9. The new energy site optimization evaluation method according to claim 1, characterized in that: Also includes: S8. Use the comprehensive score to optimize multiple new energy station sites and obtain the required new energy station site.

10. A new energy site optimization and evaluation system, comprising a computer device, characterized in that: The computer device is programmed or configured to execute the new energy site optimization evaluation method according to any one of claims 1 to 9.

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