Power grid equipment cost allocation method and system considering voltage class correlation
By constructing a cost sharing model for power grid equipment of various voltage levels, the cost of power grid is allocated step by step, and the problem of the inability to effectively divert the cost of power grid equipment of high voltage levels is solved, the matching of power grid investment and returns is achieved, and the efficiency of capital use is improved.
Patent Information
- Application Number
- CN202411491763.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-02-18
AI Technical Summary
The cost of high-voltage-grade power grid equipment in existing power grid systems cannot be effectively diverted, resulting in mismatch between investment and returns and lack of accurate cost sharing methods.
By constructing an investment cost sharing model for power grid equipment of each voltage level, the total expenses borne by each voltage level are calculated based on the capacity share of substations at each level, from the highest voltage level to the lowest voltage level.
It realizes accurate sharing of power grid costs, helps power grid companies optimize investment decisions, improve capital use efficiency, and ensures the matching of investment and returns.
Smart Images
Figure CN119476787A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power system operation and control technology, and in particular to a method and system for allocating power grid equipment costs taking voltage level correlation into consideration. Background Art
[0002] Strengthening the rational allocation of power grid operation and maintenance costs has become one of the important means for power grid companies to improve quality and efficiency. By improving operational efficiency and service quality to obtain profits, limited funds can be invested in construction projects that can best improve the economy and reliability of the power grid, thereby ensuring the supply of electric energy.
[0003] Scientific and reasonable operation and maintenance investment is an important means to ensure the safe operation of power grid equipment and the reliability of power supply. In the current power grid operation process, high-voltage power grid equipment has only costs but no benefits, and the costs cannot be effectively channeled. Therefore, the cost of high-voltage power grid equipment is allocated to the user end step by step, which can measure the matching degree of power grid investment and benefits. Substations of various voltage levels include public substations and dedicated substations. Dedicated substations are directly connected to users, and users invest and build them by themselves, so there is no need to consider the investment and construction costs of dedicated substations. Public substations transmit electricity to substations of the next voltage level until the user end, so the investment costs of public substations need to continue to be allocated until the user end. The same substation is connected to substations of multiple voltage levels. In the allocation process, the power flow relationship of the power grid in the area needs to be considered.
[0004] Therefore, a method for allocating grid equipment costs is urgently needed to provide a basis for lean management and precise investment of grid companies. Summary of the invention
[0005] In view of the above problems, the first purpose of the present invention is to provide a method for allocating the cost of power grid equipment considering the correlation of voltage levels. Considering the power balance results of each voltage level and the cost of the power grid equipment at each voltage level, an investment cost allocation model for power grid equipment at each voltage level is established. According to the capacity proportion of substations at each level, the cost of the power grid is allocated from top to bottom, and the total cost borne by each voltage level is calculated.
[0006] A second object of the present invention is to provide a grid equipment cost sharing system that takes voltage level relevance into consideration.
[0007] The first technical solution adopted by the present invention is: a method for allocating power grid equipment costs considering voltage level correlation, comprising:
[0008] Step S01: determining the highest voltage level and the lowest voltage level in the entire network according to the voltage level of the entire network;
[0009] Step S02: constructing a model for allocating investment costs of power grid equipment at the highest voltage level and a model for calculating investment costs of power grid equipment at the lowest voltage level;
[0010] Step S03: constructing the investment cost allocation model for power grid equipment of each voltage level step by step by using the highest voltage level power grid equipment investment cost allocation model and the voltage level;
[0011] Step S04: using the investment cost allocation model for power grid equipment at each voltage level to allocate the investment cost of power grid equipment at each voltage level step by step to the investment cost calculation model for power grid equipment at the lowest voltage level;
[0012] Step S05: Calculate the grid equipment cost allocation result using the lowest voltage level grid equipment investment cost calculation model according to the total cost of the grid equipment and the capacity parameters of each voltage level, wherein the capacity parameters of each voltage level include the capacity of a public substation and the capacity of a dedicated substation.
[0013] Preferably, the highest voltage level grid equipment investment cost allocation model in step S02 is constructed according to the highest voltage level grid equipment investment cost;
[0014] The investment cost of the highest voltage level power grid equipment includes the investment cost of the highest voltage level hub substation and the investment cost of the upstream lines.
[0015] Preferably, the highest voltage level grid equipment investment cost allocation model allocates the highest voltage level grid equipment investment cost to the next voltage level dedicated substation investment cost and the next voltage level hub substation investment cost.
[0016] Preferably, the highest voltage level grid equipment investment cost allocation model is a 500 kV grid equipment investment cost allocation model, which allocates the 500 kV voltage level grid equipment investment cost to the 220 kV dedicated substation investment cost and the 220 kV voltage level hub substation investment cost.
[0017] Preferably, the voltage levels of the entire grid include 500 kV, 220 kV, 110 kV, 35 kV and 10 kV in descending order.
[0018] Preferably, the grid equipment investment cost allocation models for each voltage level in step S03 include a 220 kV grid equipment investment cost allocation model, a 110 kV grid equipment investment cost allocation model and a 35 kV grid equipment investment cost allocation model.
[0019] Preferably, the lowest voltage level grid equipment investment cost calculation model in step S04 includes the lowest voltage level public substation investment cost and the grid equipment investment costs of each voltage level allocated to the lowest voltage level.
[0020] Preferably, the lowest voltage level grid equipment investment cost calculation model in step S04 is a 10 kV grid equipment investment cost calculation model, including the 10 kV public substation investment cost and the allocated investment costs of grid equipment at each voltage level.
[0021] Preferably, the apportioned investment costs of grid equipment at various voltage levels include investment costs of grid equipment at various voltage levels of 220 kV, 110 kV and 35 kV apportioned to 10 kV grid equipment.
[0022] Preferably, the capacity parameters of each voltage level in step S05 include public substation capacity and dedicated substation capacity.
[0023] The second technical solution adopted by the present invention is: a power grid equipment cost allocation system considering voltage level correlation, comprising:
[0024] A voltage level determination system is used to determine the highest voltage level and the lowest voltage level in the entire network according to the voltage level of the entire network;
[0025] The first model building system is used to build a highest voltage level grid equipment investment cost allocation model and a lowest voltage level grid equipment investment cost calculation model;
[0026] The second model building system is used to build the investment cost allocation model of the power grid equipment of each voltage level step by step by using the highest voltage level power grid equipment investment cost allocation model and the voltage level;
[0027] A power grid equipment investment cost allocation system is used to allocate the investment costs of power grid equipment of each voltage level step by step to the investment cost calculation model of power grid equipment of the lowest voltage level by using the investment cost allocation model of power grid equipment of each voltage level;
[0028] The result output system is used to calculate the grid equipment cost allocation result according to the total cost of the grid equipment and the capacity parameters of each voltage level using the lowest voltage level grid equipment investment cost calculation model. The capacity parameters of each voltage level include the capacity of public substations and the capacity of dedicated substations.
[0029] Beneficial effects of the above technical solution:
[0030] The technical solution of the present invention constructs a cost sharing model for the entire network from top to bottom and step by step, including a 500 kV power grid equipment investment cost sharing model, a 220 kV power grid equipment investment cost sharing model, a 110 kV power grid equipment investment cost sharing model, and a 35 kV power grid equipment investment cost sharing model. The cost of the entire network is then allocated step by step to the dedicated transformer users and public transformer users of the 10 kV voltage level. Finally, the investment cost of the 10 kV power grid equipment is calculated, which helps to clarify the investment cost of the entire network. Power grid companies can more accurately identify and evaluate the benefits of different power grid equipment investments, thereby optimizing investment decisions and improving the efficiency of capital use.
[0031] The idea of the present invention to allocate the cost of the entire network from top to bottom based on the flow relationship is to calculate the substation cost of each voltage level, and the public transformer users and special transformer users directly connected to the substation are allocated according to the capacity ratio. The substation cost of the next voltage level includes its own investment cost, the investment cost of the upstream line and the allocated cost of the previous voltage level. The cost is allocated step by step to obtain the lowest voltage level and the final allocation result. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 A flow chart of a method for allocating power grid equipment costs taking into account voltage level relevance provided by the present invention;
[0033] Figure 2 A calculation flow chart of a method for allocating grid equipment costs taking into account voltage level relevance provided in the first embodiment of the present invention. DETAILED DESCRIPTION
[0034] The following is a further detailed description of the implementation methods of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.
[0035] The terms "first", "second", etc. (if any) in the specification and claims are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.
[0036] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0037] Embodiment 1
[0038] Figure 1 A flow chart of the method for allocating the cost of power grid equipment considering the correlation of voltage levels provided by the present invention. In this embodiment, the purpose is to allocate the cost of the entire network step by step to the dedicated transformer users and public transformer users of the 10 kV voltage level, and finally calculate the investment cost of the 10 kV power grid equipment. It helps to clarify the investment cost of the entire network, and power grid companies can more accurately identify and evaluate the benefits of different power grid equipment investments, thereby optimizing investment decisions and improving the efficiency of capital use. It includes the following steps:
[0039] Step 1: Enter the cost and capacity parameters of the entire network.
[0040] Step 2: Calculate the investment cost of each public substation, that is, the sum of its own investment cost and the investment cost of the upstream line; calculate the capacity share of substations at each voltage level.
[0041] Step 3: Solve the 500 kV power grid equipment investment cost allocation model. Input the 500 kV substation investment cost and the capacity ratio of each 220 kV substation to obtain the cost allocation result of the 220 kV dedicated substation and the public substation to the 500 kV substation.
[0042] Step 4: Solve the 220 kV grid equipment investment cost allocation model. Calculate the cost of the 220 kV public substation, which is the sum of its own investment cost, the investment cost of the upstream substation and the cost allocation to the 500 kV substation, and input the capacity ratio of the substation of the next voltage level connected to the substation to obtain the allocation results of 110 kV dedicated substation, 110 kV hub substation, 220 kV-35 kV dedicated substation, 220 kV-35 kV public substation, 220 kV-10 kV dedicated substation and 220 kV-10 kV public substation to the 220 kV public substation.
[0043] Step 4: Solve the 110 kV grid equipment investment cost allocation model. Calculate the cost of the 110 kV public substation, which is the sum of its own investment cost, the investment cost of the upstream substation and the cost allocation to the 220 kV substation, and input the capacity ratio of the substation of the next voltage level connected to the substation to obtain the allocation results of 35 kV special transformer, 35 kV public transformer, 110 kV-10 kV special transformer and 110 kV-10 kV public transformer to the 110 kV public substation.
[0044] Step 5: Solve the 35 kV grid equipment investment cost allocation model. Calculate the cost of the 35 kV public transformer, which is the sum of its own investment cost, the investment cost of the upstream substation and the cost allocated to the 110 kV substation. Input the capacity ratio of the substation of the next voltage level connected to the substation, and obtain the allocation result of the 10 kV private transformer and the 10 kV public transformer to the 35 kV public transformer.
[0045] Step 6: Solve the calculation model of 10kV power grid equipment investment cost. The 10kV power grid equipment investment cost includes the investment cost of 10kV public transformer and upstream line, the investment cost of 35kV power grid equipment shared by 10kV public transformer, the investment cost of 220kV power grid equipment shared by 220kV-10kV public transformer, and the investment cost of 110kV power grid equipment shared by 110kV-10kV public transformer.
[0046] Figure 2 The calculation flow chart of the grid equipment cost allocation method considering voltage level correlation provided in the first embodiment of the present invention is as follows:
[0047] a. Constructing a 500 kV power grid equipment investment cost allocation model
[0048] The investment cost of 500 kV grid equipment is shared by 220 kV dedicated substations and 220 kV hub substations. The specific calculation process is as follows:
[0049] a1. Calculation of investment cost of 500 kV power grid equipment
[0050] The investment cost of 500 kV power grid equipment includes the investment cost of 500 kV hub substation and the investment cost of upstream lines. The specific relationship is as follows:
[0051]
[0052] Where: FC (500) Indicates the total cost that needs to be shared for 500 kV power grid equipment; The investment cost of a 500 kV voltage level hub substation; It is the investment cost of the upstream public i-th line of the 500 kV voltage level substation.
[0053] a2. Calculation of apportioned costs of 220 kV dedicated substation
[0054] k 220 kV dedicated substations, built by the user and the line, calculate their share of 500 kV costs. The cost share of the kth 220 kV dedicated substation is calculated as follows:
[0055]
[0056] Where: represents the 500 kV grid equipment investment cost shared by the kth 220 kV dedicated substation; represents the capacity of the kth 220 kV dedicated substation; represents the capacity of the i-th public 220 kV substation.
[0057] a3. Calculation of apportioned costs of 220 kV hub substation
[0058] The 220 kV hub substation needs to continue to share the investment costs of the 500 kV grid equipment, that is, the cost after deducting the cost shared by the 220 kV dedicated substation. The specific relationship is as follows:
[0059]
[0060] Where: It represents the investment cost of 500 kV grid equipment shared by the i-th 220 kV public substation.
[0061] b. Constructing a model for allocating investment costs of 220 kV power grid equipment
[0062] The investment cost of 220 kV power grid equipment is shared by 110 kV dedicated substation, 110 kV hub substation, 220 kV-35 kV dedicated transformer, 220 kV-35 kV public transformer, 220 kV-10 kV dedicated transformer and 220 kV-10 kV public transformer. The specific calculation process is as follows:
[0063] b1. Calculation of investment cost of 220 kV power grid equipment
[0064] The investment cost of 220 kV power grid equipment includes the investment cost of 220 kV hub substation and upstream lines, and the investment cost of 500 kV power grid equipment shared by 220 kV public substation. The specific relationship is as follows:
[0065]
[0066] Where: FC (220) It represents the investment cost of 220 kV power grid equipment; The investment cost of the 220 kV hub substation is It is the investment cost of the i-th utility line upstream of the 220 kV substation.
[0067] b2. Calculation of apportioned costs for 110 kV dedicated substation
[0068] k 110 kV dedicated substations, built by the users themselves and the lines themselves, calculate their share of the 220 kV costs.
[0069]
[0070] Where: represents the 220 kV grid equipment investment cost shared by the kth 110 kV dedicated substation; represents the capacity of the kth 110 kV dedicated substation; represents the capacity of the ith public 110 kV substation; represents the capacity of the jth 220 kV-35 kV special transformer; Indicates the capacity of the mth 220 kV-35 kV public transformer; Indicates the capacity of the hth 220 kV-10 kV public transformer; Indicates the capacity of the tth 220 kV-10 kV special transformer.
[0071] b3. Calculation of apportionment costs of 220 kV-35 kV special transformer
[0072] j 220 kV-35 kV dedicated transformers, built by the user themselves, and the lines built by the user themselves, calculate their share of the 220 kV costs.
[0073]
[0074] Where: It represents the investment cost of 220 kV power grid equipment shared by the j-th 220 kV-35 kV special transformer.
[0075] b4. Calculation of apportionment costs of 220 kV-35 kV public transformer
[0076] There are m 220 kV-35 kV public transformers, calculate their share of the 220 kV cost.
[0077]
[0078] Where: It represents the investment cost of 220 kV power grid equipment shared by the mth 220 kV-35 kV public transformer.
[0079] b5. Calculation of shared costs of 220 kV-10 kV public transformer
[0080] There are h 220 kV-10 kV public transformers, and their share of the 220 kV cost is calculated.
[0081]
[0082] Where: It represents the investment cost of 220 kV power grid equipment shared by the hth 220 kV-10 kV public transformer.
[0083] b6. Calculation of apportionment costs of 220 kV-10 kV special transformer
[0084]
[0085] Where: It represents the investment cost of 220 kV power grid equipment shared by the hth 220 kV-10 kV public transformer.
[0086] b7. Calculation of apportionment of costs for 110 kV hub substation
[0087] The 110 kV hub substation needs to continue to share the investment costs of the 220 kV power grid equipment, that is, deduct the costs of the 110 kV dedicated substation, 220 kV-35 kV dedicated transformer, 220 kV-35 kV public transformer, 220 kV-10 kV public transformer and 220 kV-10 kV dedicated transformer. The specific relationship is as follows:
[0088]
[0089] Where: It represents the investment cost of 220 kV grid equipment shared by the i-th 110 kV public substation.
[0090] c. Constructing a model for allocating investment costs of 110 kV power grid equipment
[0091] The investment cost of 110 kV power grid equipment is shared by 35 kV special transformer, 35 kV public transformer, 110 kV-10 kV special transformer and 110 kV-10 kV public transformer. The specific calculation process is as follows:
[0092] c1. Calculation of investment cost of 110 kV power grid equipment
[0093] The investment cost of 110 kV power grid equipment includes the investment cost of 110 kV hub substation and upstream lines, and the investment cost of 220 kV power grid equipment shared by all 110 kV public substations. The specific relationship is as follows:
[0094]
[0095] Where: FC (110) It represents the investment cost of 110 kV power grid equipment; The investment cost of the 110 kV hub substation is It is the investment cost of the ith utility line upstream of the 110 kV substation.
[0096] C2. Calculation of apportionment costs of 35 kV special transformer
[0097] k 35 kV dedicated transformers, built by the user and the lines built by the user, calculate their share of the 110 kV cost.
[0098]
[0099] Where: represents the investment cost of 110 kV power grid equipment shared by the kth 35 kV special transformer; represents the capacity of the kth 35 kV transformer; represents the capacity of the i-th 35 kV transformer; Indicates the capacity of the hth 110 kV-10 kV public transformer; Indicates the capacity of the tth 110 kV-10 kV special transformer.
[0100] c3. Calculation of apportionment costs of 110 kV to 10 kV public transformer
[0101] There are h 110 kV-10 kV public transformers, and their share of the 110 kV costs is calculated.
[0102]
[0103] Where: It represents the investment cost of 110 kV power grid equipment shared by the hth 110 kV-10 kV public transformer;
[0104] c4. Calculation of apportionment costs of 110 kV-10 kV special transformer
[0105] t 110 kV-10 kV dedicated transformer, built by the user himself, the line is built by the user himself, and its share of the 110 kV cost is calculated.
[0106]
[0107] Where: It represents the investment cost of 110 kV power grid equipment shared by the tth 110 kV-10 kV special transformer.
[0108] C5, 35 kV public transformer cost sharing calculation
[0109] The 35 kV public transformer needs to continue to share the investment costs of the 110 kV power grid equipment, that is, deduct the costs shared by the 35 kV special transformer, 110 kV-10 kV public transformer and 110 kV-10 kV special transformer.
[0110]
[0111] Where: It represents the investment cost of 110 kV grid equipment shared by the i-th 35 kV public transformer.
[0112] d. Construct a model for allocating investment costs of 35 kV power grid equipment
[0113] The investment cost of 35 kV power grid equipment is shared by 10 kV special transformer and 10 kV public transformer. The specific process is as follows:
[0114] d1. Calculation of investment cost of 35 kV power grid equipment
[0115] The investment costs of 35 kV power grid equipment include the investment costs of 35 kV public transformers and upstream lines, the investment costs of 110 kV power grid equipment shared by 35 kV public transformers, and the investment costs of 220 kV power grid equipment shared by 220 kV-35 kV public transformers.
[0116] The specific relationship is as follows:
[0117]
[0118] Where: FC (35) Indicates the total cost that needs to be shared for 35 kV power grid equipment; The investment cost of 35 kV transformer; The investment cost of the upstream public line i of the 35 kV public transformer
[0119] d2. Calculation of apportionment costs of 10 kV special transformer
[0120] k 10 kV dedicated transformers, built by the user and the lines built by the user, calculate their share of the 35 kV cost.
[0121]
[0122] Where: represents the investment cost of 35 kV power grid equipment shared by the kth 10 kV special transformer; represents the capacity of the kth 10 kV transformer; Represents the capacity of the i-th 10 kV public transformer.
[0123] d3, 10 kV public transformer cost sharing calculation
[0124] The 10 kV public transformer needs to continue to share the investment costs of the 35 kV grid equipment, that is, minus the costs shared by the 10 kV private transformer.
[0125]
[0126] Where: Represents the 35 kV cost shared by the i-th 10 kV public transformer.
[0127] e. Calculation model of investment cost of 10 kV power grid equipment
[0128] The investment cost of 10kV power grid equipment includes the investment cost of 10kV public transformer and upstream line. The investment cost of upstream line includes the investment cost of 35kV power grid equipment shared by 10kV public transformer, the investment cost of 220kV power grid equipment shared by 220kV-10kV public transformer and the investment cost of 110kV power grid equipment shared by 110kV-10kV public transformer. The specific relationship is as follows:
[0129]
[0130] f. Cost-benefit result output
[0131] According to the above model, various relevant parameters are input, such as the capacity of public substations and special substations at various voltage levels, investment and construction costs, investment and construction costs of upstream lines, etc., to calculate the investment cost of power grid equipment.
[0132] The investment cost of power grid equipment, i.e. the investment cost of power grid equipment at 500 kV voltage level, includes the cost of 220 kV dedicated substation and the investment cost of 10 kV power grid equipment.
[0133] The power grid equipment cost sharing system considering voltage level correlation provided by the present invention includes:
[0134] A voltage level determination system is used to determine the highest voltage level and the lowest voltage level in the entire network according to the voltage level of the entire network;
[0135] The first model building system is used to build a highest voltage level grid equipment investment cost allocation model and a lowest voltage level grid equipment investment cost calculation model;
[0136] The second model building system is used to build the investment cost allocation model of the power grid equipment of each voltage level step by step by using the highest voltage level power grid equipment investment cost allocation model and the voltage level;
[0137] A power grid equipment investment cost allocation system is used to allocate the investment costs of power grid equipment of each voltage level step by step to the investment cost calculation model of power grid equipment of the lowest voltage level by using the investment cost allocation model of power grid equipment of each voltage level;
[0138] The result output system is used to calculate the grid equipment cost allocation result according to the total cost of the grid equipment and the capacity parameters of each voltage level using the lowest voltage level grid equipment investment cost calculation model. The capacity parameters of each voltage level include the capacity of public substations and the capacity of dedicated substations.
[0139] The idea of the present invention to allocate the cost of the entire network from top to bottom based on the flow relationship is to calculate the cost of the substation at each voltage level, and allocate it according to the capacity ratio of the public transformers and special transformers directly connected to the substation. The cost of the substation at the next voltage level includes its own investment cost, the investment cost of the upstream line and the allocated cost of the previous voltage level. The cost is allocated step by step to obtain the lowest voltage level and the final allocation result.
[0140] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.
Claims
1. A method for allocating power grid equipment costs considering voltage level correlation, characterized in that: include: Step S01: determining the highest voltage level and the lowest voltage level in the entire network according to the voltage level of the entire network; Step S02: constructing a model for allocating investment costs of power grid equipment at the highest voltage level and a model for calculating investment costs of power grid equipment at the lowest voltage level; Step S03: constructing the investment cost allocation model for power grid equipment of each voltage level step by step by using the highest voltage level power grid equipment investment cost allocation model and the voltage level; Step S04: using the investment cost allocation model for power grid equipment at each voltage level to allocate the investment cost of power grid equipment at each voltage level step by step to the investment cost calculation model for power grid equipment at the lowest voltage level; Step S05: Calculate the grid equipment cost allocation result using the lowest voltage level grid equipment investment cost calculation model according to the total cost of the grid equipment and the capacity parameters of each voltage level, wherein the capacity parameters of each voltage level include the capacity of a public substation and the capacity of a dedicated substation.
2. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The highest voltage level grid equipment investment cost allocation model in step S02 is constructed according to the highest voltage level grid equipment investment cost; The investment cost of the highest voltage level power grid equipment includes the investment cost of the highest voltage level hub substation and the investment cost of the upstream lines.
3. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The highest voltage level grid equipment investment cost allocation model allocates the highest voltage level grid equipment investment cost to the next level voltage dedicated substation investment cost and the next level voltage hub substation investment cost.
4. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The highest voltage level grid equipment investment cost allocation model is a 500 kV grid equipment investment cost allocation model, which allocates the 500 kV voltage level grid equipment investment cost to the 220 kV dedicated substation investment cost and the 220 kV voltage level hub substation investment cost.
5. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The voltage levels of the entire grid include 500 kV, 220 kV, 110 kV, 35 kV and 10 kV in descending order.
6. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The investment cost allocation models for grid equipment of each voltage level described in step S03 include a 220 kV grid equipment investment cost allocation model, a 110 kV grid equipment investment cost allocation model and a 35 kV grid equipment investment cost allocation model.
7. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The lowest voltage level grid equipment investment cost calculation model in step S04 includes the lowest voltage level public substation investment cost and the grid equipment investment costs of each voltage level allocated to the lowest voltage level.
8. The method for allocating power grid equipment costs considering voltage level correlation according to claim 1, characterized in that: The lowest voltage level grid equipment investment cost calculation model in step S04 is a 10 kV grid equipment investment cost calculation model, including the 10 kV public substation investment cost and the allocated investment costs of grid equipment at each voltage level.
9. The method for allocating power grid equipment costs considering voltage level correlation according to claim 8, characterized in that: The shared investment costs of grid equipment at various voltage levels include the investment costs of grid equipment at various voltage levels of 220 kV, 110 kV and 35 kV shared to 10 kV grid equipment.
10. A power grid equipment cost sharing system considering voltage level correlation, characterized in that: include: A voltage level determination system is used to determine the highest voltage level and the lowest voltage level in the entire network according to the voltage level of the entire network; The first model building system is used to build a highest voltage level grid equipment investment cost allocation model and a lowest voltage level grid equipment investment cost calculation model; The second model building system is used to build the investment cost allocation model of the power grid equipment of each voltage level step by step by using the highest voltage level power grid equipment investment cost allocation model and the voltage level; A power grid equipment investment cost allocation system is used to allocate the investment costs of power grid equipment of each voltage level step by step to the investment cost calculation model of power grid equipment of the lowest voltage level by using the investment cost allocation model of power grid equipment of each voltage level; The result output system is used to calculate the grid equipment cost allocation result according to the total cost of the grid equipment and the capacity parameters of each voltage level using the lowest voltage level grid equipment investment cost calculation model. The capacity parameters of each voltage level include the capacity of public substations and the capacity of dedicated substations.