Distributed photovoltaic access capacity bearing capacity calculation method and system of power system

Abstract

The invention discloses a distributed photovoltaic access capacity bearing capacity calculation method of a power system. The method comprises the following steps: acquiring data information of a target power system; dividing the power grid type of the target power system; according to the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power grid electric energy quality requirements, the distributed photovoltaic access capacity bearing capacity of the target power system is evaluated in different angles; and completing the calculation of the distributed photovoltaic access capacity bearing capacity of the target power system according to the angle-division evaluation result. The invention also discloses a system for realizing the distributed photovoltaic access capacity bearing capacity calculation method of the power system. According to the method, the distributed photovoltaic access capacity bearing capacity is calculated from the aspects of the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, and the method is not only suitable for the current power system, but also higher in reliability and better in accuracy.

Description

Technical Field

[0001] The present invention belongs to the field of electrical automation, and in particular relates to a method and system for calculating the carrying capacity of distributed photovoltaic access capacity of an electric power system. Background Art

[0002] With the development of economy and technology and the improvement of people's living standards, electricity has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring the stable and reliable supply of electricity has become one of the most important tasks of the power system.

[0003] At present, environmental problems are becoming more and more serious, so more and more distributed photovoltaic power generation systems are beginning to be integrated into the power system and generate electricity. Although distributed photovoltaic power generation systems are clean and efficient, their output is also extremely random and has a wide range of fluctuations. With the grid-connected power generation of distributed photovoltaic power generation systems, the power grid system is also facing major challenges. Therefore, after the distributed photovoltaic power generation is connected to the distribution network, the calculation of the distribution network's carrying capacity is particularly important.

[0004] At present, the traditional distributed photovoltaic access capacity calculation scheme adopted by the power system is generally designed and calculated for a specific scenario; however, this method is less targeted and does not comprehensively consider factors such as the development potential, power supply security and power supply quality of distributed photovoltaics. It is difficult to adapt to the computing needs of various types of scenarios today and the refined management requirements of the power system. Summary of the invention

[0005] One of the purposes of the present invention is to provide a method for calculating the carrying capacity of distributed photovoltaic access capacity of a power system with high reliability and good accuracy.

[0006] A second object of the present invention is to provide a system for realizing the method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system.

[0007] The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system provided by the present invention comprises the following steps:

[0008] S1. Obtain data information of the target power system;

[0009] S2. Classify the target power system grid type according to the data information obtained in step S1;

[0010] S3. According to the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, the distributed photovoltaic access capacity carrying capacity of the target power system is evaluated from different angles;

[0011] S4. Based on the angle-based evaluation results obtained in step S3, the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system is completed.

[0012] Step S2, according to the data information obtained in step S1, classifies the grid type of the target power system, and specifically includes the following steps:

[0013] Determine the power grid type of the target power system according to the user objects and user characteristics of the target power system;

[0014] The types of power grids include rural residential, administrative office, commercial, industrial and public service.

[0015] According to the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system, and the power quality requirements of the power grid, the distributed photovoltaic access capacity carrying capacity of the target power system is evaluated from different angles, and specifically includes the following steps:

[0016] According to the land use nature, land area, building density and roof area in the target power system, from the perspective of the development potential of distributed photovoltaic power generation, the distributed photovoltaic development potential access capacity of the target power system is calculated;

[0017] According to the operation mode, equipment threshold, load data, power processing characteristics and system safety requirements of the target power system, the distributed photovoltaic safety and reliability access capacity of the target power system is calculated from the perspective of the safety and reliability requirements of the target power system;

[0018] According to the equipment parameters, voltage requirements, power factor and power quality requirements of the target power system, the distributed photovoltaic power quality access capacity of the target power system is calculated from the perspective of the power quality requirements of the power grid of the target power system.

[0019] The method of calculating the distributed photovoltaic development potential access capacity of the target power system from the perspective of the development potential of distributed photovoltaic power generation according to the land use nature, land area, building density and roof area in the target power system specifically includes the following steps:

[0020] The distributed photovoltaic development potential access capacity S of the target power system is calculated using the following formula: K :

[0021] S K =S×R1×P1×R2×R3

[0022] Where S is the construction land area; R1 is the building density coefficient, if the target power system grid type is public service or administrative office type, R1 = 0.3, if the target power system grid type is commercial or industrial type, R1 = 0.4, if the target power system grid type is rural residential type, R1 = 1; P1 is the installed capacity per unit roof projection area; R2 is the roof utilization coefficient, if the target power system grid type is commercial type, R2 = 0.6, if the target power system grid type is public service, administrative office or industrial type, R2 = 0.7, if the target power system grid type is rural residential type, R2 = 0.8; R3 is the development intensity, if the target power system grid type is rural residential type, R3 = 0.6, if the target power system grid type is commercial or industrial type, R3 = 0.65, if the target power system grid type is public service type, R3 = 0.7, if the target power system grid type is administrative office type, R3 = 0.75.

[0023] The method of calculating the distributed photovoltaic safety and reliability access capacity of the target power system from the perspective of the safety and reliability requirements of the target power system according to the operation mode, equipment threshold, load data, power processing characteristics and system safety requirements of the target power system specifically includes the following steps:

[0024] The distributed photovoltaic safety and reliability access capacity S of the target power system is calculated using the following formula: N :

[0025] S N =λ×S e +P D ×k T

[0026] Where λ is the reverse load rate of the equipment. If the equipment is below 110 kV, λ = 80%; if the equipment is 110 kV and above, λ = 0; S e is the rated capacity of the equipment; P D is the maximum power load of the equipment; k T is the equivalent coupling coefficient of the user's maximum load conversion at the same time when the distributed photovoltaic power generation is at its maximum output. If the target power system is of rural residential type, then k T =0.53, if the target power system is of administrative office type, then k T =0.89, if the target power system is a commercial power grid, then k T =1, if the target power system is industrial, then k T =0.78, if the target power system is a public service type, then k T =0.97.

[0027] The distributed photovoltaic power quality access capacity of the target power system is calculated from the perspective of the power quality requirements of the power grid of the target power system according to the equipment parameters, voltage requirements, power factor and power quality requirements of the target power system, and specifically includes the following steps:

[0028] The distributed photovoltaic power quality access capacity S of the target power system is calculated using the following formula: G :

[0029]

[0030] Where ΔU is the boundary value of line voltage drop in the target power system; U N is the rated voltage value of the line head end voltage in the target power system; G U is the distribution coefficient of distributed photovoltaic access to the target power grid. If the distributed photovoltaic access situation is the terminal concentration type, G U =1, if the distributed photovoltaic access situation is average distribution type, then G U =2, if the distributed photovoltaic access situation is gradually increasing towards the end, then G U =1.5, if the distributed photovoltaic access situation is gradually decreasing towards the end, then G U =3, if the distributed photovoltaic access situation is the middle heavy distribution type, then G U =4; r0 is the resistance per unit length of the line in the target power system; x0 is the reactance per unit length of the line in the target power system; is the power factor of the target power system; L is the length of the line in the target power system;

[0031] Among them, the terminal concentration type corresponds to the distribution amount of distributed photovoltaic at the end of the line of the target power system exceeding 60%; the average distribution type corresponds to the distribution amount of the target power system from the first section to the half of the line and from the half of the line to the end of the line, which differs by no more than 20%; the terminal gradually increasing type corresponds to the distribution amount of the target power system from the first section to the half of the line is less than the distribution amount from the half of the line to the end of the line, and the deviation is greater than 20%; the terminal gradually decreasing type corresponds to the distribution amount of the target power system from the first section to the half of the line is greater than the distribution amount from the half of the line to the end of the line, and the deviation is greater than 20%.

[0032] The step S4, according to the angle-based evaluation results obtained in step S3, completes the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system, and specifically includes the following steps:

[0033] According to the angle-based evaluation results obtained in step S3, the minimum capacity among the development potential access capacity, the safety and reliability access capacity, and the power quality access capacity is selected as the carrying capacity value of the distributed photovoltaic access capacity of the final target power system.

[0034] The present invention also provides a system for implementing the method for calculating the distributed photovoltaic access capacity carrying capacity of the power system, comprising a data acquisition module, a type classification module, a capacity evaluation module and a capacity calculation module; the data acquisition module, the type classification module, the capacity evaluation module and the capacity calculation module are connected in series in sequence; the data acquisition module is used to acquire data information of the target power system, and upload the data information to the type classification module; the type classification module is used to classify the power grid type of the target power system according to the received data information and the acquired data information, and upload the data information to the capacity evaluation module; the capacity evaluation module is used to perform angle-based evaluation on the distributed photovoltaic access capacity carrying capacity of the target power system according to the received data information, the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, and upload the data information to the capacity calculation module; the capacity calculation module is used to complete the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system according to the received data information and the obtained angle-based evaluation results.

[0035] The distributed photovoltaic access capacity carrying capacity calculation method and system of the power system provided by the present invention evaluates the distributed photovoltaic access capacity from the perspectives of the development potential of distributed photovoltaic power generation in the target power system, the safety and reliability requirements of the target power system, and the power quality requirements of the power grid, thereby realizing the calculation of the distributed photovoltaic access capacity carrying capacity; therefore, the scheme of the present invention is not only applicable to today's power system, but also has higher reliability and better accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a schematic diagram of the method flow of the present invention.

[0037] Figure 2 Schematic diagram of the functional modules of the system of the present invention. DETAILED DESCRIPTION

[0038] like Figure 1 The method flow diagram of the method of the present invention is shown as follows: The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system disclosed in the present invention comprises the following steps:

[0039] S1. Obtain data information of the target power system;

[0040] S2. According to the data information obtained in step S1, the grid type of the target power system is divided; specifically, the following steps are included:

[0041] Determine the power grid type of the target power system according to the user objects and user characteristics of the target power system;

[0042] The types of power grids include rural residential, administrative office, commercial, industrial and public service;

[0043] Among them, the rural residential category mainly corresponds to the power grid where more than 80% of the target power load is the rural residential load; the administrative office category mainly corresponds to the power grid where more than 80% of the target power load is the administrative office load; the commercial category mainly corresponds to the power grid where more than 80% of the target power load is the commercial load; the industrial category mainly corresponds to the power grid where more than 80% of the target power load is the industrial load; the public service category mainly corresponds to the power grid where more than 80% of the target power load is the public supporting service load;

[0044] S3. According to the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, the distributed photovoltaic access capacity carrying capacity of the target power system is evaluated from different angles; the specific steps include the following:

[0045] According to the land use nature, land area, building density and roof area in the target power system, from the perspective of the development potential of distributed photovoltaic power generation, the distributed photovoltaic development potential access capacity of the target power system is calculated; specifically, the following steps are included:

[0046] The development potential assessment provides the maximum developable capacity constraint for the distributed photovoltaic access capacity, and conducts theoretical assessment through different development application scenarios, building density coefficients and development intensity. In the actual distributed photovoltaic development and construction, the building density coefficients, roof utilization coefficients and development intensity of different application scenarios are not the same.

[0047] The distributed photovoltaic development potential access capacity S of the target power system is calculated using the following formula: K :

[0048] S K =S×R1×P1×R2×R3

[0049] Where S is the construction land area; R1 is the building density coefficient. If the target power system's grid type is public service or administrative office, R1 = 0.3; if the target power system's grid type is commercial or industrial, R1 = 0.4; if the target power system's grid type is rural residents, R1 = 1; P1 is the installed capacity per unit roof projection area. The capacity of a single solar panel is between 425 and 540 watts, and the size of a single panel is between 2.18 (2.1 × 1.04 meters) and 2.53 (2.3 × 1.1 meters) square meters. The typical photovoltaic installation angle is between 30° and 40°. Considering the photovoltaic panel power, shading, installation angle, installation gap and other factors, the installed capacity per unit roof projection area is preferably 150 watts / square meter; R2 is the roof benefit The coefficient is used to comprehensively consider the influence of factors such as building density, rooftop air conditioners, antennas, elevator rooms and other ancillary facilities, as well as roof shape, shading, solar heating facilities, etc. The optimal value is: if the grid type of the target power system is commercial, R2 = 0.6; if the grid type of the target power system is public service, administrative office or industrial, R2 = 0.7; if the grid type of the target power system is rural residential, R2 = 0.8; R3 is the development intensity, if the grid type of the target power system is rural residential, R3 = 0.6; if the grid type of the target power system is commercial or industrial, R3 = 0.65; if the grid type of the target power system is public service, R3 = 0.7; if the grid type of the target power system is administrative office, R3 = 0.75;

[0050] According to the operation mode, equipment threshold, load data, power processing characteristics and system safety requirements of the target power system, the distributed photovoltaic safety and reliability access capacity of the target power system is calculated from the perspective of the safety and reliability requirements of the target power system; specifically, the following steps are included:

[0051] Safety and reliability assessment provides operational safety constraints for distributed photovoltaic access. Distributed photovoltaic access to the power grid should fully consider the absorption capacity of the access point to ensure the safety of the power grid. In the actual operation of the power system, the maximum output of distributed photovoltaics is not synchronized with the maximum time of equipment load, and the equivalent coupling coefficient at the same time needs to be considered.

[0052] The distributed photovoltaic safety and reliability access capacity S of the target power system is calculated using the following formula: N :

[0053] S N =λ×S e +P D ×k T

[0054] Where λ is the reverse load rate of the equipment. If the equipment is below 110 kV, λ = 80% (corresponding to no overload in reverse transmission). If the equipment is 110 kV and above, λ = 0 (corresponding to no reverse transmission allowed). S e is the rated capacity of the equipment. When the optimal value is selected, the substation, line, and substation are the substation capacity, line safety transmission capacity, and main transformer capacity respectively; P D is the maximum power load of the equipment; k T is the equivalent coupling coefficient of the user's maximum load conversion at the same time when the distributed photovoltaic power generation is at its maximum output. If the target power system is of rural residential type, then k T =0.53, if the target power system is of administrative office type, then k T =0.89, if the target power system is a commercial power grid, then k T =1, if the target power system is industrial, then k T =0.78, if the target power system is a public service type, then k T =0.97;

[0055] According to the equipment parameters, voltage requirements, power factor and power quality requirements of the target power system, the distributed photovoltaic power quality access capacity of the target power system is calculated from the perspective of the power quality requirements of the power grid of the target power system; specifically, the following steps are included:

[0056] The power quality assessment requires that the line voltage quality meets the requirements of the guidelines after the distributed photovoltaic access. Under the voltage constraint, the constraint condition for the carrying capacity of the distributed photovoltaic access distribution network is to ensure that the line end voltage does not exceed 1.07U N ,Theoretical evaluation was carried out by using different conductor equipment parameters, distributed PV access points and dispersion levels;

[0057] The distributed photovoltaic power quality access capacity S of the target power system is calculated using the following formula: G :

[0058]

[0059] Where ΔU is the boundary value of line voltage drop in the target power system; U N is the rated voltage value of the line head end voltage in the target power system; G U is the distribution coefficient of distributed photovoltaic access to the target power grid. If the distributed photovoltaic access situation is the terminal concentration type, G U =1, if the distributed photovoltaic access situation is average distribution type, then G U =2, if the distributed photovoltaic access situation is gradually increasing towards the end, then G U =1.5, if the distributed photovoltaic access situation is gradually decreasing towards the end, then GU =3, if the distributed photovoltaic access situation is the middle heavy distribution type, then G U =4; r0 is the resistance per unit length of the line in the target power system; x0 is the reactance per unit length of the line in the target power system; is the power factor of the target power system; L is the length of the line in the target power system;

[0060] In specific implementation, the terminal concentration type corresponds to the distribution amount of distributed photovoltaic at the end of the line of the target power system exceeding 60%; the average distribution type corresponds to the distribution amount of the target power system from the first section to the half of the line and the distribution amount from the half of the line to the end of the line, which does not differ by more than 20%; the terminal gradually increases the type, which corresponds to the distribution amount of the target power system from the first section to the half of the line is less than the distribution amount from the half of the line to the end of the line, and the deviation is greater than 20%; the terminal gradually decreases the type, which corresponds to the distribution amount of the target power system from the first section to the half of the line is greater than the distribution amount from the half of the line to the end of the line, and the deviation is greater than 20%;

[0061] S4. According to the angle-based evaluation results obtained in step S3, the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system is completed; specifically, the following steps are included:

[0062] According to the angle-based evaluation results obtained in step S3, the minimum capacity among the development potential access capacity, the safety and reliability access capacity, and the power quality access capacity is selected as the carrying capacity value of the distributed photovoltaic access capacity of the final target power system.

[0063] like Figure 2 The functional module schematic diagram of the system of the present invention is shown as follows: the system disclosed in the present invention for realizing the distributed photovoltaic access capacity carrying capacity calculation method of the power system comprises a data acquisition module, a type classification module, a capacity evaluation module and a capacity calculation module; the data acquisition module, the type classification module, the capacity evaluation module and the capacity calculation module are connected in series in sequence; the data acquisition module is used to acquire data information of the target power system, and upload the data information to the type classification module; the type classification module is used to classify the power grid type of the target power system according to the received data information and the acquired data information, and upload the data information to the capacity evaluation module; the capacity evaluation module is used to evaluate the distributed photovoltaic access capacity carrying capacity of the target power system according to the received data information, the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, and upload the data information to the capacity calculation module; the capacity calculation module is used to complete the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system according to the received data information and the obtained angle evaluation results.

Claims

1. A method for calculating the carrying capacity of distributed photovoltaic access capacity of a power system, comprising the following steps: S1. Obtain data information of the target power system; S2. Classify the target power system grid type according to the data information obtained in step S1; S3. According to the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, the distributed photovoltaic access capacity carrying capacity of the target power system is evaluated from different angles; S4. Based on the angle-based evaluation results obtained in step S3, the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system is completed.

2. The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system according to claim 1 is characterized in that Step S2, according to the data information obtained in step S1, classifies the grid type of the target power system, and specifically includes the following steps: Determine the power grid type of the target power system according to the user objects and user characteristics of the target power system; The types of power grids include rural residential, administrative office, commercial, industrial and public service.

3. The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system according to claim 2 is characterized in that According to the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system, and the power quality requirements of the power grid, the distributed photovoltaic access capacity carrying capacity of the target power system is evaluated from different angles, and specifically includes the following steps: According to the land use nature, land area, building density and roof area in the target power system, from the perspective of the development potential of distributed photovoltaic power generation, the distributed photovoltaic development potential access capacity of the target power system is calculated; According to the operation mode, equipment threshold, load data, power processing characteristics and system safety requirements of the target power system, the distributed photovoltaic safety and reliability access capacity of the target power system is calculated from the perspective of the safety and reliability requirements of the target power system; According to the equipment parameters, voltage requirements, power factor and power quality requirements of the target power system, the distributed photovoltaic power quality access capacity of the target power system is calculated from the perspective of the power quality requirements of the power grid of the target power system.

4. The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system according to claim 3 is characterized in that The method of calculating the distributed photovoltaic development potential access capacity of the target power system from the perspective of the development potential of distributed photovoltaic power generation according to the land use nature, land area, building density and roof area in the target power system specifically includes the following steps: The distributed photovoltaic development potential access capacity S of the target power system is calculated using the following formula: K : S K =S×R1×P1×R2×R3 Where S is the construction land area; R1 is the building density coefficient, if the target power system grid type is public service or administrative office type, R1 = 0.3, if the target power system grid type is commercial or industrial type, R1 = 0.4, if the target power system grid type is rural residential type, R1 = 1; P1 is the installed capacity per unit roof projection area; R2 is the roof utilization coefficient, if the target power system grid type is commercial type, R2 = 0.6, if the target power system grid type is public service, administrative office or industrial type, R2 = 0.7, if the target power system grid type is rural residential type, R2 = 0.8; R3 is the development intensity, if the target power system grid type is rural residential type, R3 = 0.6, if the target power system grid type is commercial or industrial type, R3 = 0.65, if the target power system grid type is public service type, R3 = 0.7, if the target power system grid type is administrative office type, R3 = 0.

75.

5. The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system according to claim 3 is characterized in that The method of calculating the distributed photovoltaic safety and reliability access capacity of the target power system from the perspective of the safety and reliability requirements of the target power system according to the operation mode, equipment threshold, load data, power processing characteristics and system safety requirements of the target power system specifically includes the following steps: The distributed photovoltaic safety and reliability access capacity S of the target power system is calculated using the following formula: N : S N =λ×S e +P D ×k T Where λ is the reverse load rate of the equipment. If the equipment is below 110 kV, λ = 80%; if the equipment is 110 kV and above, λ = 0; S e is the rated capacity of the equipment; P D is the maximum power load of the equipment; k T is the equivalent coupling coefficient of the user's maximum load conversion at the same time when the distributed photovoltaic power generation is at its maximum output. If the target power system is of rural residential type, then k T =0.53, if the target power system is of administrative office type, then k T =0.89, if the target power system is a commercial power grid, then k T =1, if the target power system is industrial, then k T =0.78, if the target power system is a public service type, then k T =0.

97.

6. The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system according to claim 3 is characterized in that The distributed photovoltaic power quality access capacity of the target power system is calculated from the perspective of the power quality requirements of the power grid of the target power system according to the equipment parameters, voltage requirements, power factor and power quality requirements of the target power system, and specifically includes the following steps: The distributed photovoltaic power quality access capacity S of the target power system is calculated using the following formula: G : Where ΔU is the boundary value of line voltage drop in the target power system; U N is the rated voltage value of the line head end voltage in the target power system; G U is the distribution coefficient of distributed photovoltaic access to the target power grid. If the distributed photovoltaic access situation is the terminal concentration type, G U =1, if the distributed photovoltaic access situation is average distribution type, then G U =2, if the distributed photovoltaic access situation is gradually increasing towards the end, then G U =1.5, if the distributed photovoltaic access situation is gradually decreasing towards the end, then G U =3, if the distributed photovoltaic access situation is the middle heavy distribution type, then G U =4; r0 is the resistance per unit length of the line in the target power system; x0 is the reactance per unit length of the line in the target power system; is the power factor of the target power system; L is the length of the line in the target power system; Among them, the terminal concentration type corresponds to the distribution amount of distributed photovoltaic at the end of the line of the target power system exceeding 60%; the average distribution type corresponds to the distribution amount of the target power system from the first section to the half of the line and from the half of the line to the end of the line, which differs by no more than 20%; the terminal gradually increasing type corresponds to the distribution amount of the target power system from the first section to the half of the line is less than the distribution amount from the half of the line to the end of the line, and the deviation is greater than 20%; the terminal gradually decreasing type corresponds to the distribution amount of the target power system from the first section to the half of the line is greater than the distribution amount from the half of the line to the end of the line, and the deviation is greater than 20%.

7. The method for calculating the carrying capacity of distributed photovoltaic access capacity of the power system according to claim 3 is characterized in that The step S4, according to the angle-based evaluation results obtained in step S3, completes the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system, and specifically includes the following steps: According to the angle-based evaluation results obtained in step S3, the minimum capacity among the development potential access capacity, the safety and reliability access capacity, and the power quality access capacity is selected as the carrying capacity value of the distributed photovoltaic access capacity of the final target power system.

8. A system for implementing the method for calculating the carrying capacity of distributed photovoltaic access capacity of a power system according to any one of claims 1 to 7, characterized in that It includes a data acquisition module, a type classification module, a capacity evaluation module and a capacity calculation module; the data acquisition module, the type classification module, the capacity evaluation module and the capacity calculation module are connected in series in sequence; the data acquisition module is used to acquire data information of the target power system, and upload the data information to the type classification module; the type classification module is used to classify the power grid type of the target power system according to the received data information and the acquired data information, and upload the data information to the capacity evaluation module; the capacity evaluation module is used to evaluate the distributed photovoltaic access capacity carrying capacity of the target power system from different angles according to the received data information, the development potential of distributed photovoltaic power generation, the safety and reliability requirements of the target power system and the power quality requirements of the power grid, and upload the data information to the capacity calculation module; The capacity calculation module is used to complete the calculation of the distributed photovoltaic access capacity carrying capacity of the target power system based on the received data information and the obtained angle-based evaluation results.

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