Method and device for evaluating feasibility of multi-zone flexible interconnection

Abstract

The application provides a kind of multi-zone flexible interconnection feasibility evaluation method and device, method includes: determining the parameters of to be interconnected zone;Initialize current time and the overload load rate constraint boundary of to be interconnected zone;According to parameters and overload load rate constraint boundary, calculate the overload constraint power deviation of to be interconnected zone at current time;According to overload constraint power deviation, the flexible interconnection feasibility of to be interconnected zone is evaluated, to obtain evaluation result.Thereby, according to the parameters of to be interconnected zone and overload load rate constraint boundary, the overload constraint power deviation of to be interconnected zone is calculated, and then the flexible interconnection feasibility is evaluated according to overload constraint power deviation, whether multiple zones are suitable for flexible interconnection can be judged, and the application efficiency of multi-zone flexible interconnection can be improved, and application effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible interconnection of transformer area, and particularly relates to a feasibility evaluation method for flexible interconnection of multiple transformer areas and a feasibility evaluation device for flexible interconnection of multiple transformer areas. BACKGROUND

[0002] With the development of social economy and the enhancement of environmental awareness, the rapid development of electric vehicles and the growth of load density have posed new challenges to the transformation of transformer area distribution transformers. The mature development of power electronics has made flexible interconnection technology a flexible way for dynamic capacity expansion and reliable interconnection of transformer areas. By adjusting the power of the flexible interconnection device, multiple transformer areas can be flexibly interconnected to adjust the load rate of different transformer areas and reduce the risk of overload operation of transformer areas. The essence is to utilize the complementary nature of load rates among transformer areas, with light-load transformer areas bearing part of the load of heavy-load transformer areas, thereby improving the operational flexibility of interconnected transformer areas. If the load rates of transformer areas do not complement each other, it will be difficult to take advantage of flexible interconnection. Therefore, it is necessary to evaluate the feasibility of flexible interconnection in combination with the load rate of the transformer areas to be interconnected, which is of great significance to the optimization design of the scheme and the improvement of capacity configuration efficiency.

[0003] In related technologies, flexible interconnection of transformer areas mainly focuses on the form structure and operation control after interconnection, and there is no feasibility evaluation of whether multiple transformer areas are suitable for flexible interconnection, resulting in low application efficiency and poor effect of flexible interconnection of multiple transformer areas. SUMMARY

[0004] To solve one of the above technical problems, the present application proposes the following technical solutions.

[0005] The first aspect of the present application provides a feasibility evaluation method for flexible interconnection of multiple transformer areas, comprising the following steps: determining parameters of transformer areas to be interconnected; initializing a heavy-load load rate constraint boundary of a current time and the transformer areas to be interconnected; calculating a heavy-load constraint power deviation of the transformer areas to be interconnected at the current time according to the parameters and the heavy-load load rate constraint boundary; and evaluating the feasibility of flexible interconnection of the transformer areas to be interconnected according to the heavy-load constraint power deviation to obtain an evaluation result.

[0006] In addition, the feasibility evaluation method for flexible interconnection of multiple transformer areas according to the above embodiments of the present application can also have the following additional technical features.

[0007] According to one embodiment of the present application, initializing the heavy-load load rate constraint boundary comprises: determining a load rate corresponding to heavy load of the transformer areas to be interconnected; and initializing the heavy-load load rate constraint boundary according to the load rate corresponding to heavy load of the transformer areas to be interconnected.

[0008] According to one embodiment of the present application, the parameters include the total number of substations of the to-be-interconnected substations, load data and distribution transformer capacity of each substation, wherein the load data includes a load power time sequence of each substation.

[0009] According to one embodiment of the present application, the flexible interconnection feasibility of the to-be-interconnected substations is evaluated according to the overload constraint power deviation to obtain an evaluation result, including: judging whether the to-be-interconnected substations satisfy the overload constraint condition of flexible interconnection according to the overload constraint power deviation; if the to-be-interconnected substations do not satisfy the overload constraint condition of flexible interconnection, updating the overload load rate constraint boundary, and returning to the step of calculating the overload constraint power deviation of the to-be-interconnected substations at the current time according to the parameters and the overload load rate constraint boundary until the to-be-interconnected substations satisfy the overload constraint condition of flexible interconnection; if the to-be-interconnected substations satisfy the overload constraint condition of flexible interconnection, updating the current time, and judging whether the current time satisfies the calculation termination condition after updating; if the current time does not satisfy the calculation termination condition, returning to the step of calculating the overload constraint power deviation of the to-be-interconnected substations at the current time according to the parameters and the overload load rate constraint boundary until the current time satisfies the calculation termination condition; if the current time satisfies the calculation termination condition, evaluating the flexible interconnection feasibility of the to-be-interconnected substations according to the final calculation value of the overload load rate constraint boundary to obtain an evaluation result.

[0010] According to one embodiment of the present application, judging whether the to-be-interconnected substations satisfy the overload constraint condition of flexible interconnection according to the overload constraint power deviation includes: when the overload constraint power deviation is less than 0, determining that the to-be-interconnected substations satisfy the overload constraint condition of flexible interconnection; when the overload constraint power deviation is greater than or equal to 0, determining that the to-be-interconnected substations do not satisfy the overload constraint condition of flexible interconnection.

[0011] According to one embodiment of the present application, the overload constraint power deviation is calculated according to the following formula:

[0012]

[0013] wherein t = 1, 2, …, T, T is the time length of the load power time sequence, ΔP t is the overload constraint power deviation at t time, N TD is the total number of substations of the to-be-interconnected substations, is the load power of the i-th substation at t time, S TD,i is the distribution transformer capacity of the i-th substation, λ h' is the overload load rate constraint boundary.

[0014] According to one embodiment of the present application, the overload load rate constraint boundary is updated according to the following formula:

[0015]

[0016] wherein t = 1, 2, …, T, T is the time length of the load power time sequence, ΔP t is the overload constraint power deviation at time t, N TD is the total number of transformer areas to be interconnected, is the load power of the i-th transformer area at time t, S TD,i is the distribution transformer capacity of the i-th transformer area, λ h' is the overload load rate constraint boundary.

[0017] According to one embodiment of the present application, it is determined whether the current time satisfies the calculation termination condition, comprising: when the current time is less than or equal to the time length of the load data, it is determined that the current time satisfies the calculation termination condition; when the current time is greater than the time length of the load data, it is determined that the current time does not satisfy the calculation termination condition.

[0018] According to one embodiment of the present application, the flexibility interconnection feasibility of the transformer areas to be interconnected is evaluated according to the final calculation value of the overload load rate constraint boundary to obtain an evaluation result, specifically comprising: comparing the final calculation value of the overload load rate constraint boundary with the maximum accepted value of boundary relaxation; when the final calculation value of the overload load rate constraint boundary is greater than the maximum accepted value of boundary relaxation, a first evaluation result is obtained, and the first evaluation result is that the flexibility interconnection of the transformer areas to be interconnected is not feasible; when the final calculation value of the overload load rate constraint boundary is less than or equal to the maximum accepted value of boundary relaxation, a second evaluation result is obtained, and the second evaluation result is that the flexibility interconnection of the transformer areas to be interconnected is feasible, and the feasible region is [λ h'z , λ h',max ], wherein λ h'z is the final calculation value of the overload load rate constraint boundary, and λ h',max is the maximum accepted value of boundary relaxation.

[0019] The second aspect embodiment of the present application proposes a feasibility evaluation device for multi-transformer area flexibility interconnection, comprising: a determination module for determining parameters of transformer areas to be interconnected; an initialization module for initializing a current time and an overload load rate constraint boundary of the transformer areas to be interconnected; a calculation module for calculating an overload constraint power deviation of the transformer areas to be interconnected at the current time according to the parameters and the overload load rate constraint boundary; and an evaluation module for evaluating the flexibility interconnection feasibility of the transformer areas to be interconnected according to the overload constraint power deviation to obtain an evaluation result.

[0020] The technical solution of this invention calculates the heavy load constraint power deviation of the transformer substation to be interconnected based on the parameters and heavy load rate constraint boundary of the substation to be interconnected, and then evaluates the feasibility of flexible interconnection based on the heavy load constraint power deviation. This can determine whether multiple transformer substations are suitable for flexible interconnection technology, thereby improving the application efficiency and application effect of flexible interconnection of multiple transformer substations. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the feasibility assessment method for flexible interconnection of multiple distribution zones according to an embodiment of the present invention.

[0022] Figure 2 This is a flowchart illustrating a feasibility assessment method for flexible interconnection of multiple zones, as an example of the present invention.

[0023] Figure 3 This is a schematic diagram of flexible interconnection of three interconnected stations as an example of the present invention.

[0024] Figure 4 This is a structural block diagram of a feasibility assessment device for flexible interconnection of multiple zones according to an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Related technologies lack feasibility assessments for the suitability of flexible interconnection for multiple transformer substations, resulting in low efficiency and poor performance in the application of flexible interconnection across multiple substations. Therefore, this invention establishes a feasibility assessment method for flexible interconnection across multiple transformer substations, analyzes the feasible domain of flexible interconnection, and improves the application efficiency of flexible interconnection across multiple transformer substations. Thus, this invention proposes a feasibility assessment method for flexible interconnection across multiple transformer substations.

[0027] Figure 1 This is a flowchart illustrating the feasibility assessment method for flexible interconnection of multiple distribution zones according to an embodiment of the present invention.

[0028] It should be noted that the feasibility assessment method for flexible interconnection of multiple transformer substations in this embodiment of the invention is used to assess the feasibility of flexible interconnection of multiple transformer substations to be interconnected, so as to assess whether the multiple transformer substations to be interconnected are suitable for flexible interconnection. If it is suitable or feasible, the multiple transformer substations to be interconnected can be flexibly interconnected; if it is not suitable or feasible, the multiple transformer substations to be interconnected may not be flexibly interconnected.

[0029] like Figure 1As shown, the method includes the following steps S1 to S4.

[0030] S1, determine the parameters of the station area to be interconnected.

[0031] The parameters include the total number of stations N to be interconnected. TD (Greater than or equal to 2), load data and transformer capacity for each distribution area, wherein the load data includes the load power time series for each distribution area.

[0032] Specifically, when multiple transformer substations need to be flexibly interconnected, a feasibility assessment of the flexible interconnection is required. To conduct this assessment, the total number N of the transformer substations to be interconnected must first be determined. TD Determine the transformer capacity of each distribution area, i.e. Among them, S TD,1 This is the transformer capacity of the first distribution area, S TD,2 This is the transformer capacity of the second distribution area, S TD,i It is the distribution transformer capacity of the i-th transformer area. It is the Nth TD The transformer capacity of each distribution area was determined, and the load power time series of each distribution area was determined. Among them, P TD,ac,1 This is the load power time series of the first transformer area, P TD,ac,2 This is the load power time series of the second transformer area, P TD,ac,i It is the load power time series of the i-th transformer area. It is the Nth TD Load power time series of each transformer substation.

[0033] The time length T of the load power time series can be determined according to actual needs.

[0034] S2, initialize the heavy load rate constraint boundary for the current time and the interconnected areas.

[0035] Among them, the heavy load rate constraint boundary of the area to be interconnected can refer to the heavy load in the area to be interconnected.

[0036] Specifically, the current moment and the heavy load rate constraint boundary are variables, and can be initialized according to the following formula to complete the assignment of values ​​to the two variables:

[0037] t=t0 (1)

[0038] λ h' =λ h (2)

[0039] Where t is the current time, t0 is the initial time (which can be 1), and λ h' It is the boundary condition for the heavy load rate of the transformer area, λh is the initial value of the overload load rate constraint boundary of the transformer area.

[0040] S3, according to the parameters and the overload load rate constraint boundary, calculating the overload constraint power deviation of the to-be-interconnected transformer area at the current time.

[0041] Specifically, after initializing the current time and the overload load rate constraint boundary, according to the total number N of transformer areas of the to-be-interconnected transformer area TD , the transformer capacity of each transformer area the load power time sequence of each transformer area calculating the overload constraint power deviation of the to-be-interconnected transformer area at the current time.

[0042] Specifically, the overload constraint power deviation can be calculated according to the following formula:

[0043]

[0044] Wherein, t = 1, 2, …, T, T is the time length of the load power time sequence, ΔP t is the overload constraint power deviation at t time, N TD is the total number of transformer areas of the to-be-interconnected transformer area, is the load power of the i-th transformer area at t time, S TD,i is the transformer capacity of the i-th transformer area, λ h' is the overload load rate constraint boundary.

[0045] S4, according to the overload constraint power deviation, evaluating the flexible interconnection feasibility of the to-be-interconnected transformer area to obtain an evaluation result.

[0046] Specifically, after calculating the overload constraint power deviation, the flexible interconnection feasibility of the to-be-interconnected transformer area is evaluated with the overload constraint power deviation as an index to obtain an evaluation result, which can represent whether the to-be-interconnected transformer area is suitable for flexible interconnection.

[0047] Therefore, the feasibility evaluation method of the multi-transformer area flexible interconnection can calculate the overload constraint power deviation of the to-be-interconnected transformer area according to the parameters and the overload load rate constraint boundary of the to-be-interconnected transformer area, and then evaluate the flexible interconnection feasibility according to the overload constraint power deviation, so as to determine whether the multiple transformer areas are suitable for flexible interconnection technology, and improve the application efficiency and effect of the multi-transformer area flexible interconnection.

[0048] In an embodiment of the present application, the initialization of the overload load rate constraint boundary in the above step S2 can include: determining the load rate corresponding to the overload of the to-be-interconnected transformer area; initializing the overload load rate constraint boundary according to the load rate corresponding to the overload of the to-be-interconnected transformer area.

[0049] Specifically, first, the load rate corresponding to the heavy load of the to-be-interconnected transformer area is determined, and then the load rate corresponding to the heavy load is taken as the initial value of the heavy load rate constraint boundary to realize the initialization of the heavy load rate constraint boundary.

[0050] In an embodiment of the present application, the step S4, i.e., the evaluation of the flexible interconnection feasibility of the to-be-interconnected transformer area according to the heavy load constraint power deviation, can include: judging whether the to-be-interconnected transformer area satisfies the heavy load constraint condition of the flexible interconnection according to the heavy load constraint power deviation; if the to-be-interconnected transformer area does not satisfy the heavy load constraint condition of the flexible interconnection, updating the heavy load rate constraint boundary, and returning to the step (i.e., step S3) of calculating the heavy load constraint power deviation of the to-be-interconnected transformer area at the current time according to the parameters and the heavy load rate constraint boundary until the to-be-interconnected transformer area satisfies the heavy load constraint condition of the flexible interconnection; if the to-be-interconnected transformer area satisfies the heavy load constraint condition of the flexible interconnection, updating the current time, and judging whether the current time satisfies the calculation termination condition after the updating; if the current time does not satisfy the calculation termination condition, returning to the step (i.e., step S3) of calculating the heavy load constraint power deviation of the to-be-interconnected transformer area at the current time according to the parameters and the heavy load rate constraint boundary until the current time satisfies the calculation termination condition; and if the current time satisfies the calculation termination condition, evaluating the flexible interconnection feasibility of the to-be-interconnected transformer area according to the final calculation value of the heavy load rate constraint boundary to obtain the evaluation result.

[0051] wherein the heavy load rate constraint boundary is updated according to the following formula:

[0052]

[0053] wherein t = 1, 2, …, T, T is the time length of the load power time sequence, ΔP t is the heavy load constraint power deviation at the t time, N TD is the total number of transformer areas of the to-be-interconnected transformer area, is the load power of the i-th transformer area at the t time, S TD,i is the distribution transformer capacity of the i-th transformer area, λ h' is the heavy load rate constraint boundary.

[0054] Further, judging whether the to-be-interconnected transformer area satisfies the heavy load constraint condition of the flexible interconnection according to the heavy load constraint power deviation includes: when the heavy load constraint power deviation is less than 0, determining that the to-be-interconnected transformer area satisfies the heavy load constraint condition of the flexible interconnection; and when the heavy load constraint power deviation is greater than or equal to 0, determining that the to-be-interconnected transformer area does not satisfy the heavy load constraint condition of the flexible interconnection.

[0055] Furthermore, determining whether the current time meets the calculation termination condition can include: if the current time is less than or equal to the time length of the load data, then the current time meets the calculation termination condition; if the current time is greater than the time length of the load data, then the current time does not meet the calculation termination condition.

[0056] In one example, the feasibility of flexible interconnection of the area to be interconnected is evaluated based on the final calculated value of the heavy load factor constraint boundary to obtain an evaluation result. Specifically, this may include: comparing the final calculated value of the heavy load factor constraint boundary with the maximum acceptable value for boundary relaxation; if the final calculated value of the heavy load factor constraint boundary is greater than the maximum acceptable value for boundary relaxation, a first evaluation result is obtained, indicating that flexible interconnection of the area to be interconnected is infeasible; if the final calculated value of the heavy load factor constraint boundary is less than or equal to the maximum acceptable value for boundary relaxation, a second evaluation result is obtained, indicating that flexible interconnection of the area to be interconnected is feasible, and the feasible region is [λ]. h'z ,λ h',max ], where λ h'z It is the final calculated value of the heavy load rate constraint boundary, λ. h',max It is the maximum acceptable value for boundary relaxation.

[0057] The maximum acceptable value for boundary relaxation can be determined based on actual needs, and can be set between 0.8 and 1.

[0058] Specifically, such as Figure 2 As shown, after calculating the heavy load constraint power deviation according to formula (3), it is compared with 0. When the heavy load constraint power deviation is less than 0, it means that the interconnected area meets the heavy load constraint condition of flexible interconnection after passing through flexible interconnection. Therefore, the heavy load rate constraint boundary is not updated and the next step is directly performed. When the heavy load constraint power deviation is greater than or equal to 0, it means that the interconnected area still has a heavy overload phenomenon after passing through flexible interconnection. Then, the heavy load rate constraint boundary is recalculated according to formula (4) and returned to step S3 until the interconnected area meets the heavy load constraint condition of flexible interconnection and the next step is performed.

[0059] In other words, after calculating the heavy load constraint power deviation, the heavy load constraint boundary is relaxed and updated according to the following formula:

[0060]

[0061] When the interconnected areas meet the heavy-load constraints of flexible interconnection, the current time can be updated according to the following formula:

[0062] t = t + 1 (6)

[0063] ReferenceFigure 2 After updating the current time, it is judged whether the current time satisfies the calculation termination condition, wherein the calculation termination condition refers to a condition for terminating the calculation of the overload load rate constraint boundary, which can be t>T. When t≤T, the calculation termination condition is not satisfied, and then the step S3 is returned, that is, the overload constraint power deviation is calculated, and then it is judged again whether the overload constraint condition is satisfied according to the overload constraint power deviation. When the overload constraint condition is satisfied, the current time is updated again, and it is judged again whether the calculation termination condition is satisfied. The current time and the overload constraint power deviation / overload load rate constraint boundary are calculated in the loop until the condition t>T is satisfied, and the final calculation value of the overload load rate constraint boundary (the value obtained by calculating the overload load rate constraint boundary for the last time) is output. The final calculation value of the overload load rate constraint boundary is compared with the boundary relaxation maximum acceptable value. When the final calculation value of the overload load rate constraint boundary is greater than the boundary relaxation maximum acceptable value, it indicates that the overload load rate constraint cannot be satisfied after the to-be-interconnected substation is flexibly interconnected, and therefore the first evaluation result that the flexible interconnection of the to-be-interconnected substation is not feasible is obtained. When the final calculation value of the overload load rate constraint boundary is less than or equal to the boundary relaxation maximum acceptable value, it indicates that the overload load rate constraint can be satisfied after the to-be-interconnected substation is flexibly interconnected, and therefore the second evaluation result that the flexible interconnection of the to-be-interconnected substation is feasible and the feasible region (feasible range) is [λ h'z ,λ h',max ] is obtained.

[0064] For the to-be-interconnected substation, the overload load rate constraint boundary can be calculated according to the method of the embodiment of the present application, and the final calculation value of the overload load rate constraint boundary is obtained. The flexible interconnection evaluation index can be determined according to the final calculation value of the overload load rate constraint boundary, and can be determined according to the following formula:

[0065]

[0066] wherein, is the flexible interconnection evaluation index, which is a 0-1 variable, indicating whether the flexible interconnection is feasible, 1 being feasible and 0 being infeasible.

[0067] It should be noted that when the flexible interconnection of multiple to-be-interconnected substations is evaluated to be feasible, the to-be-interconnected substations can be flexibly interconnected through the flexible interconnection devices of each substation. For example, when the flexible interconnection of three to-be-interconnected substations is feasible, the three to-be-interconnected substations can be interconnected to obtain the interconnected substations as shown in Figure 3

[0068] That is, based on the load data of the to-be-interconnected substations, the overload load rate constraint and other conditions, the present embodiment analyzes the satisfaction of the load rate overload constraint before and after the flexible interconnection, realizes the feasible region analysis of the multi-substation flexible interconnection, and improves the efficiency of the multi-substation flexible feasibility evaluation.​

[0069] In summary, the embodiment of the present application considers the flexible interconnection complementary characteristics and the overload constraint condition, establishes the overload constraint power deviation index under the flexible interconnection, and further dynamically updates the overload load rate constraint boundary, realizes the quantitative evaluation of whether the flexible interconnection of multiple transformer areas is feasible and the feasible range, can not only evaluate whether the flexible interconnection of multiple transformer areas is feasible, but also determine the feasible domain, provides the load rate constraint condition with the feasible flexible interconnection for the next step of the flexible interconnection configuration of the transformer area, improves the application efficiency of the flexible interconnection of multiple transformer areas, and improves the application effect.

[0070] Figure 4 The structure block diagram of the feasibility evaluation device for the flexible interconnection of multiple transformer areas of the embodiment of the present application.

[0071] As shown in Figure 4 , the device comprises a determination module 10, an initialization module 20, a calculation module 30 and an evaluation module 40.

[0072] Among them, the determination module 10 is used for determining the parameters of the to-be-interconnected transformer area; the initialization module 20 is used for initializing the current time and the overload load rate constraint boundary of the to-be-interconnected transformer area; the calculation module 30 is used for calculating the overload constraint power deviation of the to-be-interconnected transformer area at the current time according to the parameters and the overload load rate constraint boundary; and the evaluation module 40 is used for evaluating the feasibility of the flexible interconnection of the to-be-interconnected transformer area according to the overload constraint power deviation, to obtain an evaluation result.

[0073] It should be noted that the specific implementation and implementation principle of the feasibility evaluation device for the flexible interconnection of multiple transformer areas can refer to the specific implementation of the above-mentioned feasibility evaluation method for the flexible interconnection of multiple transformer areas, and to avoid redundancy, it will not be described in detail here.

[0074] The feasibility evaluation device for the flexible interconnection of multiple transformer areas of the embodiment of the present application calculates the overload constraint power deviation of the to-be-interconnected transformer area according to the parameters of the to-be-interconnected transformer area and the overload load rate constraint boundary, and then evaluates the feasibility of the flexible interconnection according to the overload constraint power deviation, which can determine whether multiple transformer areas are suitable for the flexible interconnection technology, and can improve the application efficiency and application effect of the flexible interconnection of multiple transformer areas.

[0075] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. The meaning of "multiple" is two or more, unless otherwise specifically limited.

[0076] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for evaluating the feasibility of multi-zone flexible interconnection, characterized in that, The method comprises the following steps: determining parameters of to-be-interconnected power supply areas; initializing a current time and a heavy-load rate constraint boundary of the to-be-interconnected power supply areas; calculating a heavy-load constraint power deviation of the to-be-interconnected power supply areas at the current time according to the parameters and the heavy-load rate constraint boundary; evaluating flexibility of the to-be-interconnected power supply areas according to the heavy-load constraint power deviation to obtain an evaluation result, the parameters comprise a total number of the to-be-interconnected power supply areas, load data and distribution transformer capacity of each power supply area, wherein the load data comprises a load power time sequence of each power supply area, the evaluating flexibility of the to-be-interconnected power supply areas according to the heavy-load constraint power deviation to obtain an evaluation result comprises: judging whether the to-be-interconnected power supply areas satisfy a heavy-load constraint condition of flexible interconnection according to the heavy-load constraint power deviation; if the to-be-interconnected power supply areas do not satisfy the heavy-load constraint condition of flexible interconnection, updating the heavy-load rate constraint boundary and returning to the step of calculating the heavy-load constraint power deviation of the to-be-interconnected power supply areas at the current time according to the parameters and the heavy-load rate constraint boundary until the to-be-interconnected power supply areas satisfy the heavy-load constraint condition of flexible interconnection; if the to-be-interconnected power supply areas satisfy the heavy-load constraint condition of flexible interconnection, updating the current time and judging whether the current time satisfies a calculation termination condition after the updating; if the current time does not satisfy the calculation termination condition, returning to the step of calculating the heavy-load constraint power deviation of the to-be-interconnected power supply areas at the current time according to the parameters and the heavy-load rate constraint boundary until the current time satisfies the calculation termination condition; if the current time satisfies the calculation termination condition, evaluating flexibility of the to-be-interconnected power supply areas according to a final calculation value of the heavy-load rate constraint boundary to obtain an evaluation result, the heavy-load constraint power deviation is calculated according to the following formula: wherein, t=1,2,…,T , T is the time length of the load power time series, is the overload constraint power deviation at the time moment, N TD is the total number of transformer areas to be interconnected, is the load power of the i-th transformer area at the time moment, is the load power of the i-th transformer area at the time moment, is the transformer capacity of the i-th transformer area, i is the transformer capacity of the i-th transformer area, is the overload load rate constraint boundary, The flexible interconnection feasibility of the to-be-interconnected substation is evaluated according to the final calculated value of the overload load rate constraint boundary, to obtain an evaluation result, specifically including: comparing the final calculated value of the overload load rate constraint boundary with a boundary relaxation maximum acceptable value; when the final calculated value of the overload load rate constraint boundary is greater than the boundary relaxation maximum acceptable value, a first evaluation result is obtained, and the first evaluation result is that the flexible interconnection of the to-be-interconnected substation is not feasible; when the final calculated value of the overload load rate constraint boundary is less than or equal to the boundary relaxation maximum acceptable value, a second evaluation result is obtained, and the second evaluation result is that the flexible interconnection of the to-be-interconnected substation is feasible, and a feasible region is wherein, is the final calculated value of the overload load rate constraint boundary, is the boundary relaxation maximum acceptable value.

2. The method for feasibility assessment of multi-zone flexible interconnection according to claim 1, wherein, the initializing the heavy-load rate constraint boundary comprises: determining a heavy-load corresponding load rate of the to-be-interconnected power supply areas; initializing the heavy-load rate constraint boundary according to the heavy-load corresponding load rate of the to-be-interconnected power supply areas.

3. The method for feasibility assessment of multi-zone flexible interconnection according to claim 1, wherein, the judging whether the to-be-interconnected power supply areas satisfy the heavy-load constraint condition of flexible interconnection according to the heavy-load constraint power deviation comprises: when the heavy-load constraint power deviation is less than 0, it is determined that the to-be-interconnected power supply areas satisfy the heavy-load constraint condition of flexible interconnection; when the heavy-load constraint power deviation is greater than or equal to 0, it is determined that the to-be-interconnected power supply areas do not satisfy the heavy-load constraint condition of flexible interconnection.

4. The method for feasibility assessment of multi-zone flexible interconnection according to claim 1, wherein, the updating the heavy-load rate constraint boundary according to the following formula: in, t=1,2,…,T , T It is the time length of the load power time series. yes The heavy load constraint power deviation at any given time. N TD This is the total number of the stations to be interconnected. yes Time of the first The load power of each transformer area It is the first i Distribution transformer capacity of each substation area It is the heavy load rate constraint boundary.

5. The method for feasibility assessment of multi-zone flexible interconnection according to claim 1, wherein, the judging whether the current time satisfies the calculation termination condition comprises: when the current time is less than or equal to a time length of the load data, it is determined that the current time satisfies the calculation termination condition; when the current time is greater than the time length of the load data, it is determined that the current time does not satisfy the calculation termination condition.

6. A multi-zone flexible interconnection feasibility assessment device for implementing the method of multi-zone flexible interconnection feasibility assessment according to claim 1, characterized by, The method comprises: a determining module configured to determine parameters of to-be-interconnected power supply areas; an initializing module configured to initialize a current time and a heavy-load rate constraint boundary of the to-be-interconnected power supply areas; a calculating module, configured to calculate a heavy-load constraint power deviation of the to-be-interconnected substation at a current time according to the parameters and the heavy-load constraint boundary; an evaluating module, configured to evaluate feasibility of flexible interconnection of the to-be-interconnected substation according to the heavy-load constraint power deviation, to obtain an evaluation result.

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