Charging pile topological structure, and evaluation method and optimization method for island rate and efficiency of charging pile topological structure

Abstract

The invention provides an evaluation method and optimization method for the island rate and efficiency of a charging pile topological structure, and the method comprises the steps: defining the important parameters (island rate and efficiency) of a non-full-matrix flexible charging pile through the analysis of the topological structure of the non-full-matrix flexible charging pile; the topological structure of the charging pile is optimized according to the increment of the efficiency of the topological structure of the charging pile along with the increase of the switching capability and the increment of the number of the plurality of parallel contactors along with the increase of the switching capability; therefore, the important parameters (islanding rate and efficiency) of the non-full-matrix flexible charging pile can be quantitatively evaluated in detail by using a scientific method, and the efficiency and the cost of the non-full-matrix flexible charging pile can be balanced to find an optimal scheme with the highest cost performance.

Description

Technical Field

[0001] The present invention relates to a charging pile topology structure, an evaluation method for an islanding rate of a charging pile topology structure, an evaluation method for the efficiency of a charging pile topology structure, and an optimization method for a charging pile topology structure. Background Art

[0002] As the market for new energy vehicles continues to grow, the demand for charging piles, as supporting equipment for electric vehicles, is also increasing. To meet this growing demand, split charging piles, with their high charging module utilization rate, can fully utilize limited charging module resources to reduce resource waste.

[0003] With a split charging pile plus terminal structure, each split device can support a maximum number of charging modules per vehicle. Full-matrix charging piles are the optimal solution for split-type charging. Each charging module acts as an independent unit, unconstrained by the power distribution topology. Any charging module can be independently dispatched to the output circuit of any terminal to charge a vehicle. However, as charging power increases, the full-matrix solution increases the overall size of the pile and the price increases exponentially, making the cost-effectiveness of the charging station extremely low.

[0004] While non-full-matrix flexible charging stations are more economical than full-matrix charging stations, they offer lower charging module utilization due to the limitations of their power distribution topology. In practice, charging modules may not be able to be dispatched to other output circuits, potentially compromising the user's charging experience. Summary of the Invention

[0005] Therefore, how to use scientific methods to conduct a quantitative and detailed evaluation of the important parameters (islanding rate, efficiency) of non-full-matrix flexible charging piles, and how to balance the efficiency and cost of non-full-matrix flexible charging piles to find the most cost-effective optimization solution are issues that need to be solved urgently.

[0006] The present invention is completed in view of the above situation, and its purpose is to provide an evaluation method and optimization method for the islanding rate and efficiency of the charging pile topology structure. By analyzing the topology structure of the non-full matrix flexible charging pile, the important parameters of the non-full matrix flexible charging pile (islanding rate, efficiency) are defined, and the charging pile topology structure is optimized according to the increase in the efficiency of the charging pile topology structure with the increase in switching capacity, and the increase in the number of multiple parallel contactors with the increase in switching capacity. In this way, the important parameters (islanding rate, efficiency) of the non-full matrix flexible charging pile can be quantitatively and detailed evaluated by scientific methods, and the efficiency and cost of the non-full matrix flexible charging pile can be balanced to find the most cost-effective optimization solution.

[0007] Technical solutions to technical problems

[0008] In order to solve the above problem, in the first aspect of the present invention, the method for evaluating the islanding rate of the charging pile topology structure involves a plurality of charging modules and a plurality of parallel contactors, characterized in that:

[0009] When all the charging modules adjacent to a certain charging module are used for charging, the charging module forms an island. The probability of island formation in the charging pile topology is defined as the island rate.

[0010] The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity.

[0011] The islanding rate of the charging pile topology is set to f(x), the number of the multiple charging modules is set to m, the switching capacity of each of the multiple charging modules is set to k, and the number of the multiple charging modules used for charging at the same time is set to x, where x≤m.

[0012] The islanding rate of the charging pile topology can be calculated by the following formula:

[0013]

[0014] Furthermore, the power of each of the multiple charging modules is equal.

[0015] The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form an m-gonal outer ring structure.

[0016] A plurality of inner ring structures are formed within the outer ring structure, and a parallel contactor is provided on each side of the inner ring structure. The number of the inner ring structures depends on the switching capacity.

[0017] Where m≥4.

[0018] The computer program product involved in the second aspect of the present invention includes a computer program, characterized in that when the computer program is executed by a processor, it implements the above-mentioned method for evaluating the islanding rate of the charging pile topology structure.

[0019] In the method for evaluating the efficiency of a charging pile topology structure according to the third aspect of the present invention, the charging pile topology structure includes a plurality of charging modules and a plurality of parallel contactors, and is characterized in that:

[0020] When all the charging modules adjacent to a certain charging module are used for charging, the charging module forms an island. The probability of island formation in the charging pile topology is defined as the island rate.

[0021] The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity.

[0022] The efficiency of the charging pile topology is set to P, the islanding rate of the charging pile topology is set to f(x), the number of the multiple charging modules is set to m, the switching capacity of each of the multiple charging modules is set to k, and the number of the multiple charging modules used for charging at the same time is set to x, where x≤m.

[0023] The efficiency of the charging pile topology can be obtained by the following equations (1) and (2):

[0024]

[0025] Furthermore, the power of each of the multiple charging modules is equal.

[0026] The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form an m-gonal outer ring structure.

[0027] A plurality of inner ring structures are formed within the outer ring structure, and a parallel contactor is provided on each side of the inner ring structure. The number of the inner ring structures depends on the switching capacity.

[0028] Where m≥4.

[0029] The computer program product involved in the fourth aspect of the present invention includes a computer program, characterized in that when the computer program is executed by a processor, it implements the above-mentioned method for evaluating the efficiency of the charging pile topology structure.

[0030] In the method for optimizing the charging pile topology structure involved in the fifth aspect of the present invention, the charging pile topology structure includes multiple charging modules and multiple parallel contactors, characterized in that:

[0031] When all the charging modules adjacent to a certain charging module are used for charging, the charging module forms an island. The probability of island formation in the charging pile topology is defined as the island rate.

[0032] The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity.

[0033] The efficiency of the charging pile topology is set to P, the islanding rate of the charging pile topology is set to f(x), the number of the multiple charging modules is set to m, the switching capacity of each of the multiple charging modules is set to k, and the number of the multiple charging modules used for charging at the same time is set to x, where x≤m.

[0034] The efficiency of the charging pile topology can be obtained by the following equations (1) and (2):

[0035]

[0036] The charging pile topology is optimized according to an increase in the efficiency of the charging pile topology as the switching capacity increases and an increase in the number of the plurality of parallel contactors as the switching capacity increases.

[0037] Furthermore, the power of each of the multiple charging modules is equal.

[0038] The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form an m-gonal outer ring structure.

[0039] A plurality of inner ring structures are formed within the outer ring structure, and a parallel contactor is provided on each side of the inner ring structure. The number of the inner ring structures depends on the switching capacity.

[0040] Where m≥4.

[0041] The computer program product involved in the sixth aspect of the present invention includes a computer program, which is characterized in that when the computer program is executed by a processor, it implements the above-mentioned charging pile topology optimization method.

[0042] The charging pile topology structure involved in the seventh aspect of the present invention includes multiple charging modules and multiple parallel contactors, and is characterized in that:

[0043] The number of the plurality of charging modules is 24, and the power of each of the plurality of charging modules is equal.

[0044] The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form a 24-sided outer ring structure.

[0045] Within the outer ring structure, every 8 charging modules are connected to form 3 octagonal inner ring structures, or every 12 charging modules are connected to form 2 12-sided inner ring structures, and a parallel contactor is provided on each side of the 8-sided inner ring structure or the 12-sided inner ring structure.

[0046] The charging pile topology structure involved in the eighth aspect of the present invention includes multiple charging modules and multiple parallel contactors, and is characterized in that:

[0047] The number of the plurality of charging modules is 24, and the power of each of the plurality of charging modules is equal.

[0048] The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form a 24-sided outer ring structure.

[0049] The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity.

[0050] According to the above-mentioned method for optimizing the charging pile topology, the charging pile topology is optimal when the switching capacity is 4.

[0051] Furthermore, the optimal charging pile topology when the switching capacity is 4 means that, compared with the cases where the switching capacity is 2, 3, 5, 6, 7, 8 to 23, the cost-effectiveness calculated from the increase in the efficiency of the charging pile topology as the switching capacity increases and the increase in the number of the multiple parallel contactors as the switching capacity increases is the highest.

[0052] Effects of the Invention

[0053] According to the present invention, by analyzing the topological structure of a non-full-matrix flexible charging pile, the important parameters (islanding rate, efficiency) of the non-full-matrix flexible charging pile are defined, and the charging pile topological structure is optimized according to the increment of the efficiency of the charging pile topological structure as the switching capacity increases, and the increment of the number of multiple parallel contactors as the switching capacity increases. In this way, a scientific method can be used to quantitatively and in detail evaluate the important parameters (islanding rate, efficiency) of the non-full-matrix flexible charging pile, and the efficiency and cost of the non-full-matrix flexible charging pile can be balanced to find the most cost-effective optimization solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Schematic diagram showing an example of a ring topology structure in a non-full matrix flexible charging pile.

[0055] Figure 2 Schematic diagram showing an example of a diagonal star topology in a non-full matrix flexible charging pile.

[0056] Figure 3A Schematic diagram showing an example of a delta-star ring topology structure in a non-full matrix flexible charging pile.

[0057] Figure 3B It is a simplified schematic diagram showing the delta-star ring parallel topology structure in a non-full matrix flexible charging pile.

[0058] Figure 4A Schematic diagram showing an example of a four-pointed star ring topology structure in a non-full matrix flexible charging pile.

[0059] Figure 4B It is a simplified schematic diagram showing the four-pointed star ring topology structure in a non-full matrix flexible charging pile.

[0060] Figure 5 It is a simplified schematic diagram showing a star-ring topology structure with a switching capacity of 5 in a non-full matrix flexible charging pile.

[0061] Figure 6 It is a simplified schematic diagram showing a star-ring topology structure with a switching capacity of 6 in a non-full matrix flexible charging pile.

[0062] Figure 7 It is a simplified schematic diagram showing a star-ring topology structure with a switching capacity of 11 in a non-full matrix flexible charging pile.

[0063] Figure 8 It is a curve diagram showing the relationship between the number of vehicles charging simultaneously and the islanding rate when the switching capacities are 2, 3, and 4 respectively in a non-full-matrix flexible charging pile with 24 charging modules. DETAILED DESCRIPTION

[0064] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0065] For ease of description, spatially relative terms, such as "below," "beneath," "below," "above," and "upper," may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the figures is turned over, an element described as "below" or "beneath" another element or feature would then be oriented "above" the other element or feature.

[0066] Unless otherwise defined, the terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Terms should be understood to have meanings consistent with their meanings in the context of the relevant technology and should not be understood in an idealized or overly formal sense unless explicitly defined herein.

[0067] <Split DC Charging Pile Topology>

[0068] Below, we first explain the basic concepts of the split-type DC charging pile topology.

[0069] Split DC charging piles (group DC charging piles) can be divided into full-matrix charging piles and other non-full-matrix flexible charging piles based on their DC contactor topology. The mainstream non-full-matrix flexible charging piles can be divided into ring parallel topology, diagonal star parallel topology, star-ring parallel topology, etc.

[0070] The power distribution of the full matrix charging pile is completed through the PDU (power distribution unit). The number of PDUs n is equal to the number of output circuits, that is, the maximum number of vehicles that can be charged simultaneously. Assuming that the number of charging modules is m, since each output circuit needs to connect the positive and negative poles of all charging modules, each output circuit corresponds to 2m contactors (m positive contactors + m negative contactors), so the total number of contactors required for the distributed full matrix charging pile is 2mn. In addition, the maximum number of vehicles that can be charged simultaneously cannot be greater than the number of charging modules, that is, n≤m, so the maximum number of contactors is 2m 2 .

[0071] Figure 1 Schematic diagram showing an example of a ring topology structure in a non-full matrix flexible charging pile. Figure 2 Schematic diagram showing an example of a diagonal star topology in a non-full matrix flexible charging pile.

[0072] like Figure 1 As shown in the figure, a non-full-matrix flexible charging pile with a ring-parallel topology connects adjacent charging modules AU in pairs through a parallel contactor K, ultimately forming a closed loop. Each charging module prioritizes charging vehicles on its corresponding output circuit. Only when there is no charging demand on that output circuit, that is, when the charging module is in an idle state, can it be scheduled to charge other output circuits. Assuming there are m charging modules, the number of contactors required for each pole of the distributed ring-parallel charging pile is m, and the total number of required contactors is 2m.

[0073] like Figure 2 As shown in the figure, a non-full-matrix flexible charging pile with a diagonal star topology builds on the ring topology by connecting diagonal charging modules in pairs, ultimately forming an outer ring structure plus a diagonal star structure. Assuming there are m charging modules, the number of contactors required per pole of the distributed diagonal star charging pile is 3 / 2m, for a total of 3m.

[0074] Furthermore, the switching capacity is defined as the number of charging modules that each charging module can directly connect to via a single parallel contactor. In a ring topology, each charging module can directly connect to two other charging modules, so the switching capacity of the ring topology is 2. In a diagonal star topology, each charging module can directly connect to three other charging modules, so the switching capacity of the diagonal star topology is 3. Assuming there are m charging modules, if each charging module can directly connect to k other charging modules, the switching capacity is k, where k ≤ m - 1.

[0075] Next, use Figure 3A 、 Figure 3B 、 Figure 4A 、 Figure 4B , the following is an example where the number of charging modules is 12 and the switching capacity is 4.

[0076] Figure 3A Schematic diagram showing an example of a delta-star ring topology structure in a non-full matrix flexible charging pile. Figure 3B It is a simplified schematic diagram showing the delta-star ring parallel topology structure in a non-full matrix flexible charging pile. Figure 4A Schematic diagram showing an example of a four-pointed star ring topology structure in a non-full matrix flexible charging pile. Figure 4B It is a simplified schematic diagram showing the four-pointed star ring topology structure in a non-full matrix flexible charging pile.

[0077] Among them, the star-ring parallel topology is defined as follows: on the basis of the ring parallel topology, every n charging modules are connected to form an n-gon, and finally an outer ring structure plus an n-gon inner ring structure is formed. The number of inner ring structures is m / n, where n is a common multiple of the number m of charging modules and satisfies 2<n≤m / 2.

[0078] like Figure 3A 、 Figure 3B 、 Figure 4A 、 Figure 4B As shown, even though the number of sides of the star-ring parallel topology is different, the switching capacity of the triangular star-ring parallel topology and the quadrangular star-ring parallel topology is 4.

[0079] Figure 5 It is a simplified schematic diagram showing a star-ring topology structure with a switching capacity of 5 in a non-full matrix flexible charging pile. Figure 6 It is a simplified schematic diagram showing a star-ring topology structure with a switching capacity of 6 in a non-full matrix flexible charging pile. Figure 7 It is a simplified schematic diagram showing a star-ring topology structure with a switching capacity of 11 in a non-full matrix flexible charging pile.

[0080] like Figure 5 、 Figure 6 、 Figure 7As shown, the larger the value of k is, the closer the working capacity of the non-full matrix flexible charging pile is to the full matrix charging pile; when the switching capacity k=m-1, the working capacity of the non-full matrix flexible charging pile is closest to the full matrix charging pile.

[0081] <Definition of Islanding Rate and Efficiency>

[0082] By conducting a detailed analysis of the topology of non-full-matrix flexible charging piles, the inventors of this invention have defined key parameters for non-full-matrix flexible charging piles: islanding rate and efficiency. These two key parameters are described in detail below.

[0083] (The creation of isolated islands)

[0084] First, the meaning of the island in the island rate defined by the inventors of the present invention will be described.

[0085] In the topology of a non-full-matrix flexible charging pile, a single charging module is limited by its switching capacity and needs to pass through the adjacent charging module circuit before it can switch to the output circuit of other charging modules.

[0086] by Figure 1 Taking the ring parallel topology shown in the figure as an example, the output circuit of charging module AU1 in an idle state can directly dispatch charging modules AU2 and AUM, and then dispatch charging modules AU3 or AUM-1 via the circuits of charging modules AU2 or AUM. However, when charging modules AU2 and AUM are occupied, the output circuit of charging module AU1 cannot dispatch any other charging modules besides AU1, forming an island in the output circuit of charging module AU1.

[0087] by Figure 2 Taking the diagonal star topology shown in the figure as an example, the output circuit of charging module AU1 in the idle state can not only directly dispatch charging modules AU2 and charging module AUM, but also directly dispatch charging module AUM / 2 on the diagonal side. Then, it dispatches other charging modules via charging module AU2, charging module AUM, or charging module AUM / 2. If the three charging modules directly connected to charging module AU1 (AU2, AUM, and AUM / 2) are occupied at the same time, the output circuit of charging module AU1 forms an island.

[0088] As switching capacity increases, the probability of islanding decreases until the switching capacity reaches m-1. Furthermore, in a full-matrix charging pile topology, all charging modules can be dispatched to any charging module's output circuit without passing through other charging module circuits, thus eliminating islanding. Furthermore, an islanding condition only exists when the charging module to be dispatched is idle. If a charging module is operating and cannot be called upon, it cannot be defined as an island.

[0089] Furthermore, any discussion of islanding must be based on a single output circuit. This is premised on the fact that all directly connected charging modules, except the one corresponding to that output circuit, are occupied. An island cannot be formed by combining two or more output circuits.

[0090] (Island rate)

[0091] Next, the islanding rate defined by the inventors of the present invention is described in detail. The islanding rate in this application refers to the probability of island formation. The inventors of the present invention have conducted a detailed analysis of the topological structure of non-full matrix flexible charging piles and summarized the calculation formula of the islanding rate Q = f(x) as follows:

[0092]

[0093] Among them, m is the number of charging modules, k is the switching capacity, and x is the number of new energy vehicles charging at the same time.

[0094] When x < k, that is, the number of new energy vehicles charging simultaneously is less than the switching capacity of the topological structure, there is no islanding situation.

[0095] Furthermore, the premise of an island is that idle charging modules cannot be dispatched to other output circuits. Therefore, the premise of an island is that the number of NEVs charging simultaneously is less than the number of charging modules, that is, x ≤ m-1. Furthermore, the switching capacity is less than the number of charging modules, that is, k ≤ m-1.

[0096] (efficiency)

[0097] Next, the efficiency defined by the inventors of the present invention will be described in detail. The efficiency is defined using the islanding rate definition.

[0098] The full matrix charging pile, with its complete topology, makes all its charging modules completely independent and arbitrarily scheduled. The full matrix charging pile's ability to schedule charging modules is set to 1, and the efficiency of the non-full matrix flexible charging pile's topology structure is calculated as the ratio of the non-full matrix flexible charging pile's ability to the full matrix charging pile. The efficiency P is calculated as follows:

[0099]

[0100] When x < k, meaning the number of NEVs charging simultaneously is less than the topology's switching capacity, there are no islands, and the efficiency P is 1. At this point, a non-full-matrix flexible charging pile can achieve the same efficiency as a full-matrix charging pile. When x ≥ k, as the number of NEVs x increases, the efficiency decreases.

[0101] <Optimization method of charging pile topology>

[0102] Below, taking the case where the power of a single charging module is 40kW and the total power cabinet is 960kW as an example, the optimization method of the charging pile topology structure is explained in detail.

[0103] In this case, the number m of charging modules is 24, the switching capacity k of the ring parallel topology is 2, the switching capacity k of the diagonal star parallel topology is 3, and the switching capacity k of the star-ring parallel topology is set to 4.

[0104] According to the above formula (1), the islanding rates when k = 2, 3, and 4 can be obtained as follows:

[0105]

[0106] According to the above formula (3) and the above formula (2), the following comparison table 1 of islanding rate and efficiency can be obtained.

[0107]

[0108]

[0109] Figure 8 It is a curve diagram showing the relationship between the number of vehicles charging simultaneously and the islanding rate when the switching capacities are 2, 3, and 4 respectively in a non-full-matrix flexible charging pile with 24 charging modules.

[0110] As shown in Table 1 and Figure 8 As shown in Figure 2, with the increase of the switching capacity k, at the same number of vehicles x, the islanding rate decreases, the integral area corresponding to 0 to the number of vehicles x also decreases, and the efficiency P of the charging module utilization increases.

[0111] For example, when the number of vehicles x is 50%, 80%, and 95% of the charging module output circuit m, respectively, the efficiency of the ring parallel topology and the diagonal star parallel topology can only reach 90%, 75%, 65% and 97%, 85%, and 75%, respectively. The efficiency of the star-ring parallel topology with a switching capacity of 4 can reach more than 99%, 90%, and 80%, respectively.

[0112] In addition, through the analysis of the topological structure, the number of contactors used in each topological structure in the above example can be obtained (where m is the number of charging modules, and m is 24 in this example), as shown in the following Table 2.

[0113]

[0114] Switching capacity 2 3 4 ··· 23 Full Matrix Number of contactors 2m＝48 3m＝72 4m＝96 ··· 23m＝552 48m＝1152

[0115] As shown in Table 2, when the switching capacity k = 4, the number of contactors used is 96, accounting for 8.33% of the total number of contactors required in the entire matrix. For each subsequent increase in the switching capacity k, the number of contactors increases by 24, but the increase in efficiency becomes increasingly smaller.

[0116] That is, in this example, for a distributed charging pile with a total power cabinet of 960kW, configured with 24 40kW charging modules, when using a star-ring parallel topology with a switching capacity of 4, the optimal charging pile topology that takes into account both efficiency and cost can be obtained.

[0117] Specifically, the optimal charging pile topology in this example is as follows: it includes multiple charging modules and multiple parallel contactors; the number of multiple charging modules is 24, and the power of each charging module is equal; the multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form a 24-sided outer ring structure; within the outer ring structure, every 8 charging modules are connected to form 3 8-sided inner ring structures, or every 12 charging modules are connected to form 2 12-sided inner ring structures, and a parallel contactor is provided on each side of the 8-sided inner ring structure or the 12-sided inner ring structure.

[0118] That is, in a charging pile topology comprising multiple charging modules and multiple parallel contactors, the number of charging modules is 24, each with equal power, and the multiple charging modules are sequentially connected, with a parallel contactor provided between adjacent charging modules to form a 24-sided outer ring structure. According to the above-described charging pile topology optimization method, the optimal charging pile topology is when the switching capacity is 4. This is because, compared with switching capacities of 2, 3, 5, 6, 7, 8, to 23, the cost-effectiveness is the highest, calculated from the increase in the efficiency of the charging pile topology as the switching capacity increases, and the increase in the number of parallel contactors as the switching capacity increases.

[0119] Therefore, according to the optimization method of the charging pile topology structure of the present invention, the optimal switching capacity that takes into account both efficiency and cost can be determined based on the increase in the efficiency of the charging pile topology structure as the switching capacity increases, and the increase in the number of multiple parallel contactors as the switching capacity increases, so as to optimize the charging pile topology structure.

[0120] It should be understood that the above description is illustrative and not restrictive. For example, the above embodiments (and / or their aspects) can be used in combination with each other. In addition, without departing from the scope of the present invention, many modifications can be made to adapt specific conditions or materials to the teachings of the various embodiments of the present invention. Although the size and type of materials described herein are used to define the parameters of the various embodiments of the present invention, the various embodiments are not meant to be restrictive, but rather exemplary embodiments. Upon reading the above description, many other embodiments will be apparent to those skilled in the art. Therefore, the scope of the various embodiments of the present invention should be determined with reference to the appended claims, and the full range of equivalent forms claimed for protection by these claims.

[0121] Industrial applicability

[0122] The evaluation method and optimization method of the islanding rate and efficiency of the charging pile topology structure of the present invention can be applied to the evaluation and design of the topology structure of a split-type DC charging pile (group charging DC charging pile).

Claims

1. A method for evaluating the islanding rate of a charging pile topology, wherein the charging pile topology includes multiple charging modules and multiple parallel contactors, characterized in that: When all the charging modules adjacent to a certain charging module are used for charging, the charging module forms an island. The probability of island formation in the charging pile topology is defined as the island rate. The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity. The islanding rate of the charging pile topology is set to f(x), the number of the multiple charging modules is set to m, the switching capacity of each of the multiple charging modules is set to k, and the number of the multiple charging modules used for charging at the same time is set to x, where x≤m. The islanding rate of the charging pile topology can be calculated by the following formula:

2. The method for evaluating the islanding rate of a charging pile topology according to claim 1, characterized in that: The power of each of the multiple charging modules is equal, The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form an m-gonal outer ring structure. A plurality of inner ring structures are formed within the outer ring structure, and a parallel contactor is provided on each side of the inner ring structure. The number of the inner ring structures depends on the switching capacity. Where m≥4.

3. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for evaluating the islanding rate of the charging pile topology structure according to claim 1 or 2 is implemented.

4. A method for evaluating the efficiency of a charging pile topology, wherein the charging pile topology includes multiple charging modules and multiple parallel contactors, characterized in that: When all the charging modules adjacent to a certain charging module are used for charging, the charging module forms an island. The probability of island formation in the charging pile topology is defined as the island rate. The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity. The efficiency of the charging pile topology is set to P, the islanding rate of the charging pile topology is set to f(x), the number of the multiple charging modules is set to m, the switching capacity of each of the multiple charging modules is set to k, and the number of the multiple charging modules used for charging at the same time is set to x, where x≤m. The efficiency of the charging pile topology can be obtained by the following equations (1) and (2):

5. The method for evaluating the efficiency of a charging pile topology according to claim 4, characterized in that: The power of each of the multiple charging modules is equal, The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form an m-gonal outer ring structure. A plurality of inner ring structures are formed within the outer ring structure, and a parallel contactor is provided on each side of the inner ring structure. The number of the inner ring structures depends on the switching capacity. Where m≥4.

6. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for evaluating the efficiency of the charging pile topology structure according to claim 4 or 5 is implemented.

7. A method for optimizing a charging pile topology, wherein the charging pile topology comprises a plurality of charging modules and a plurality of parallel contactors, characterized in that: When all the charging modules adjacent to a certain charging module are used for charging, the charging module forms an island. The probability of island formation in the charging pile topology is defined as the island rate. The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity. The efficiency of the charging pile topology is set to P, the islanding rate of the charging pile topology is set to f(x), the number of the multiple charging modules is set to m, the switching capacity of each of the multiple charging modules is set to k, and the number of the multiple charging modules used for charging at the same time is set to x, where x≤m. The efficiency of the charging pile topology can be obtained by the following equations (1) and (2): The charging pile topology is optimized according to an increase in the efficiency of the charging pile topology as the switching capacity increases and an increase in the number of the plurality of parallel contactors as the switching capacity increases.

8. The method for optimizing the charging pile topology according to claim 7, characterized in that: The power of each of the multiple charging modules is equal, The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form an m-gonal outer ring structure. A plurality of inner ring structures are formed within the outer ring structure, and a parallel contactor is provided on each side of the inner ring structure. The number of the inner ring structures depends on the switching capacity. Where m≥4.

9. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for optimizing the charging pile topology structure according to claim 7 or 8 is implemented.

10. A charging pile topology structure, comprising a plurality of charging modules and a plurality of parallel contactors, characterized in that: The number of the plurality of charging modules is 24, and the power of each of the plurality of charging modules is equal. The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form a 24-sided outer ring structure. Within the outer ring structure, every 8 charging modules are connected to form 3 octagonal inner ring structures, or every 12 charging modules are connected to form 2 12-sided inner ring structures, and a parallel contactor is provided on each side of the 8-sided inner ring structure or the 12-sided inner ring structure.

11. A charging pile topology structure, comprising multiple charging modules and multiple parallel contactors, characterized in that: The number of the plurality of charging modules is 24, and the power of each of the plurality of charging modules is equal. The multiple charging modules are connected in sequence, and a parallel contactor is provided between adjacent charging modules to form a 24-sided outer ring structure. The number of charging modules that a charging module can be directly connected to through a single parallel contactor is defined as the switching capacity. According to the method for optimizing the charging pile topology structure according to claim 7, the charging pile topology structure is optimal when the switching capacity is 4.

12. The charging pile topology structure according to claim 11, characterized in that: The optimal charging pile topology when the switching capacity is 4 means that, compared with the cases where the switching capacity is 2, 3, 5, 6, 7, 8 to 23, the cost-effectiveness calculated by the increase in the efficiency of the charging pile topology as the switching capacity increases and the increase in the number of the multiple parallel contactors as the switching capacity increases is the highest.

Images