Novel direct current SSPC configuration design method based on system load demand

Abstract

The invention belongs to the technical field of aviation secondary power distribution systems, and discloses a novel direct current SSPC configuration design method based on system load requirements. The method comprises the following steps: carding load specifications, quantity and positions in an aircraft through a system load demand list to obtain design constraint conditions; a configuration design principle is formulated according to engineering experience, and a configuration evaluation system is established; setting parameter ranges of the SSPC configuration items according to constraint conditions and engineering experience, obtaining all SSPC configuration combinations according to the parameter ranges of the SSPC configuration items, and screening the SSPC configuration combinations according to a configuration design principle to obtain SSPC configurations meeting requirements; and finally, performing weighted scoring on the SSPC configuration through various evaluation factors in the configuration evaluation system to obtain a configuration design with an optimal score. The scheme has the advantages of high efficiency, short development period and the like, and can meet the increasing power supply and distribution requirements of a more-electric aircraft power distribution system.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation secondary power distribution systems, and in particular relates to a novel DC SSPC configuration design method based on system load requirements. Background Art

[0002] As aircraft continue to develop towards multi-electrification and full electrification, the demand for electricity on board is increasing, the number and specifications of electrical loads are gradually increasing, and the aircraft power supply and distribution system is becoming more and more complex. In particular, the aircraft power distribution system has also developed from the original single centralized power distribution to diversified distributed power distribution. As the terminal product of the secondary power distribution system, SSPC is the most numerous power distribution product on board. Therefore, the number of SSPCs directly affects the flight safety and maintenance costs of the aircraft. Different SSPC configuration designs will lead to differences in the number of SSPCs on board. How to design it to ensure that the number of SSPCs and the maintenance cost are minimized while meeting the power demand of the aircraft load is an urgent problem that needs to be solved.

[0003] At present, the research on SSPC at home and abroad is mainly focused on the protection function, device characteristics, behavior patterns and other aspects of SSPC itself. For example, Northwestern Polytechnical University proposed a method of extracting features of normal current waveform and arc current waveform using Db3 wavelet three-layer decomposition in the document "Research on the Characteristics of AC SSPC Arc Detection Function Based on Wavelet Transform" to identify arc faults in the circuit so that SSPC has arc fault protection function. For example, Nanjing University of Aeronautics and Astronautics built a DC SSPC simulation model in the document "A New DC Solid-State Power Controller Behavior Model", studied the SSPC opening and closing characteristics, and improved the SSPC's formula speed and convergence performance. However, no relevant literature or patents have been found for the research on SSPC board configuration. Summary of the invention

[0004] In order to solve the technical problem of optimizing the configuration design of the aircraft secondary power distribution system SSPC, the present invention proposes a DC SSPC configuration design method based on system load. Compared with the previous single configuration design of DC SSPC, a complete SSPC concept design method and evaluation system are established. All possible SSPC configurations are evaluated through an exhaustive method to obtain the optimal configuration, thereby reducing the configuration iteration problem in the later stage of product design.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A novel DC SSPC configuration design method based on system load requirements includes the following steps:

[0007] Step 1: Use the system load requirement list to sort out the load specifications, quantity of each specification, and location of each load in the aircraft to obtain design constraints;

[0008] 1) Load specifications mainly include 3A / 5A / 7.5A / 10A / 15A;

[0009] 2) According to the system load list, the specifications and quantities of each load are N3A / N5A / N7.5A / N10A / N15A;

[0010] 3) The load position mainly refers to the power distribution product where the SSPC board that distributes power to the load is located. According to the system load list, the quantity of each specification in each power distribution product is obtained, that is, RPDU1_15A-RPDU12_15A, RPDU1_10A-RPDU12_10A, RPDU1_7.5A-RPDU12_7.5A, RPDU1_5A-RPDU12_5A, and RPDU1_3A-RPDU12_3A are obtained.

[0011] Step 2: Set configuration design principles based on engineering experience and establish a configuration evaluation system;

[0012] 1) From the overall system perspective, the factors that need to be considered mainly include the basic demand for the number of distribution loads;

[0013] 2) Power limitation of single board;

[0014] 3) The channel margin of each power distribution product should be higher than 20%;

[0015] 4) For products with a load margin of less than 30%, an empty card slot should be reserved for subsequent use;

[0016] 5) The remaining channel specifications of each RPDU product should be able to cover all rated current specifications of the load, and empty card slots should be reserved for products that do not meet the requirements;

[0017] 6) Number of boards;

[0018] 7) Number of channels;

[0019] 8) Margin for each load specification.

[0020] Step 3: Set the SSPC configuration combination range, and obtain all SSPC configuration combinations according to the SSPC configuration combination range;

[0021] 1) Establish configuration item parameters as shown in the following table;

[0022]

[0023] 2) The number ranges of small power boards and large power boards m(max), m(min), M(max), M(min) should be calculated from the load demand list;

[0024] 3) The range of the number of low-power boards and high-power single channels n(max), n(min), N(max), N(min) should be derived from the board size and engineering experience.

[0025] Step 4: Screen the SSPC configuration combination according to the configuration design principles to obtain the SSPC configuration that meets the requirements; the specific contents are as follows:

[0026] 1) The rated number of channels requires that the current programmable factor be taken into account. 5A can be programmed down to 3A, 7.5A can be programmed down to 5A and 3A, 10A can be programmed down to 7.5A and 5A, and 15A can be programmed down to 10A, 7.5A and 5A.

[0027] 2) Establish the SSPC board combination model based on the configuration combination parameter table. To meet the above-mentioned limiting factors and narrow the combination range, the constraints can be established as follows:

[0028] (1)n(min)≤L_3A+L_5A+L_7.5A+L_10A+L_15A≤n(max);

[0029] (2)N(min)≤H_3A+H_5A+H_7.5A+H_10A+H_15A≤N(max);

[0030] (3)m(min)+M(min)≤m+M≤m(max)+M(max);

[0031] (4) L_15A*m+H_15A*M≥N15A;

[0032] (5)L_15A*m+H_15A*M+L_10A*m+H_10A*M-N15A≥N10A; (6)

[0034] L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M-(N15A+N10A)≥N7.5A; (7)

[0036] L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M+L_5A*m+H_5A*M-(N15A+N10A+N7.5A)≥N5A; (8)

[0038] L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M+L_5A*m+H_5A*M+L_3A*m+H_3A*M-(N15A+N10A+N7.5A+N5A)≥N3A;

[0039] 3) Assuming that there are k combinations screened out for the first time, a parameter combination matrix can be obtained:

[0040]

[0041] 4) Extract P(1) = [m1, n1, ..., H_10A1, H_15A1] from the matrix. Therefore, the second screening problem can be transformed into a ranking combination problem. Place m1 low-power boards and M1 high-power boards into 12 RPDU products, and the load requirements of each RPDU product need to be met. Now assume that the number of low-power boards placed in each RPDU is x1, x2, ..., x11, x12; the number of high-power boards placed in each RPDU is y1, y2, ..., y11, y12; then the following relationship must be satisfied when screening the second round of combinations:

[0042] (1)x1*L_15A1+y1*H_15A>RPDU1_15A; (2)

[0044] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A-RPDU1_15A≥RPDU1_10A; (3)

[0046] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A-(RPDU1_15A+RPDU1_10A)≥RPDU1_7.5A; (4)

[0048] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A-(RPDU1_15A+RPDU1_10A+RPDU1_7.5A)≥RPDU1_5A; (5)

[0050] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H _5A+x1*L_3A1+y1*H_3A-(RPDU1_15A+RPDU1_10A+RPDU1_7.5A+RPDU1_5A)≥RPDU1_3A; (6)

[0052] [x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A+x1*L_3A1+y1*H_3A-(RPDU1_15A+RPDU1_10A+RPD U1_7.5A+RPDU1_5A+RPDU1_3A)] / (RPDU1_15A+RPDU1_10A+RPDU1_7.5A+RPDU1_5A+RPDU1_3A)]≥20%.

[0053] Step 5: Weighted scoring of SSPC configurations is performed based on various evaluation factors in the configuration evaluation system to obtain the configuration design with the best score; the specific contents are as follows:

[0054] 1) Assuming that there are s combinations screened out for the second time, a parameter combination matrix can be obtained:

[0055]

[0056] 2) Obtaining weighted scoring items for each combination based on the second screening results;

[0057] 3) Assume the weighting coefficient k1 for the number of boards, the weighting coefficient k2 for the number of channels, and the weighting coefficient k3 for the margin of each load specification; the recommended value of the weighting coefficient k1 for the number of boards is 0.25, the recommended value of the weighting coefficient k2 for the number of channels is 0.35, and the recommended value of the weighting coefficient k3 for the margin of each load specification is 0.4.

[0058] 4) The final evaluation score of the combination is calculated by using the weighting coefficient and weighted scoring items; the specific weighted calculation evaluation method is as follows: the weighted scoring items are first normalized using the average value, then the weighting coefficient is divided by each weighted scoring value, and finally the weighted scoring values ​​are added together to obtain the final score.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] 1. Compared with the previous single configuration design of DC SSPC, this application scheme has established a complete SSPC concept design method and evaluation system, and evaluates all possible SSPC configurations through exhaustive method to obtain the optimal configuration, thus reducing the configuration iteration problem in the later stage of product design.

[0061] 2. The present invention has the advantages of high efficiency and short development cycle, and can meet the growing power supply and distribution needs of the power distribution system of more-electric aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0063] Figure 1 A schematic diagram of the secondary power distribution system architecture of the present invention;

[0064] Figure 2 It is a schematic diagram of the internal structure of RPDU of the present invention;

[0065] Figure 3 It is a schematic diagram of the composition of the SSPC board of the present invention. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] The secondary power distribution system architecture adopted by the present invention is as follows Figure 1 As shown, SSPC is included in the RPDU, such as Figure 2 As shown in the figure, the specific steps of SSPC configuration design are as follows:

[0068] Step 1: Use the system load requirement list to sort out the load specifications, quantity of each specification, and each load position in the aircraft to obtain design constraints; the sorted list in this embodiment is shown in the following table.

[0069] Aircraft 28V DC Load List

[0070]

[0071]

[0072] 1) The load specifications mainly include 3A / 5A / 7.5A / 10A / 15A, so the internal configuration of the DC SSPC should be as follows: Figure 3 As shown;

[0073] 2) According to the system load list, the number of each load specification is N3A=674, N5A=148, N7.5A=48, N10A=28, N15A=34;

[0074] 3) The load position mainly refers to the power distribution product where the SSPC board that distributes power to the load is located. According to the system load list, the quantity of each specification in each power distribution product is obtained, that is, RPDU1_15A-RPDU12_15A, RPDU1_10A-RPDU12_10A, RPDU1_7.5A-RPDU12_7.5A, RPDU1_5A-RPDU12_5A, RPDU1_3A-RPDU12_3A are obtained;

[0075] Step 2: Set configuration design principles based on engineering experience and establish a configuration evaluation system;

[0076] 1) From the overall system perspective, the factors that need to be considered mainly include the basic demand for the number of distribution loads;

[0077] 2) Power limitation of single board;

[0078] 3) The channel margin of each power distribution product should be higher than 20%;

[0079] 4) For products with a load margin of less than 30%, an empty card slot should be reserved for subsequent use;

[0080] 5) The remaining channel specifications of each RPDU product should be able to cover all rated current specifications of the load, and empty card slots should be reserved for products that do not meet the requirements.

[0081] 6) Number of boards;

[0082] 7) Number of channels;

[0083] 8) Margin for each load specification.

[0084] Step 3: Set the SSPC configuration combination range, and obtain all SSPC configuration combinations according to the SSPC configuration combination range;

[0085] 1) Establish configuration item parameters, as shown in the following table:

[0086]

[0087] 2) From the above table, we can see that the number of low-power boards and high-power boards m(max) = 84, m(min) = 27, M(max) = 36, M(min) = 2 should be calculated from the load demand list;

[0088] 3) From the above table, we can see that the number of low-power boards and high-power single channels is n(max)=20, n(min)=17, N(max)=14, and N(min)=11.

[0089] Step 4: Screen the SSPC configuration combination according to the configuration design principles to obtain the SSPC configuration that meets the requirements; the specific contents are as follows:

[0090] 1) The rated number of channels requires that the current programmable factor be taken into account. 5A can be programmed down to 3A, 7.5A can be programmed down to 5A and 3A, 10A can be programmed down to 7.5A and 5A, and 15A can be programmed down to 10A, 7.5A and 5A.

[0091] 2) Establish the SSPC board combination model based on the configuration combination parameter table. To meet the above-mentioned restrictions and narrow the combination range, the constraints can be established as follows:

[0092] (1)17≤L_3A+L_5A+L_7.5A+L_10A+L_15A≤20;

[0093] (2)11≤H_3A+H_5A+H_7.5A+H_10A+H_15A≤14;

[0094] (3)56≤m+M≤120;

[0095] (4) L_15A*m+H_15A*M≥34;

[0096] (5)L_15A*m+H_15A*M+L_10A*m+H_10A*M-N15A≥28; (6)

[0098] L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M-(N15A+N10A)≥48; (7)

[0100] L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M+L_5A*m+H_5A*M-(N15A+N10A+N7.5A)≥148;

[0101] (8)L_15A*m+H_15A*M+L_10A*m+H_10A*M+

[0102] L_7.5A*m+H_7.5A*M+L_5A*m+H_5A*M+L_3A*m+H_3A*M-(N15A+

[0103] N10A+N7.5A+N5A)≥647.

[0104] 3) There are 28984 combinations screened out for the first time, and a parameter combination matrix can be obtained:

[0105]

[0106] 4) Extract P(1) = [m1, n1, ..., H_10A1, H_15A1] from the matrix. Therefore, the second screening problem can be transformed into a ranking combination problem. Place m1 low-power boards and M1 high-power boards into 12 RPDU products, and the load requirements of each RPDU product need to be met. Now assume that the number of low-power boards placed in each RPDU is x1, x2, ..., x11, x12; the number of high-power boards placed in each RPDU is y1, y2, ..., y11, y12; then the following relationship must be satisfied when screening the second round of combinations:

[0107] (1)x1*L_15A1+y1*H_15A>4;

[0108] (2)x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A-RPDU1_15A≥2; (3)

[0110] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A-(RPDU1_15A+RPDU1_10A)≥0; (4)

[0112] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A-(RPDU1_15A+RPDU1_10A+RPDU1_7.5A)≥14; (5)

[0114] x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A+x1*L_3A1+y1*H_3A-(RPDU1_15A+RPDU1_10A+RPDU 1_7.5A+RPDU1_5A)≥60; (6)

[0116] [x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A+x1*L_3A1+y1*H_3A-(RPDU1_15A+RPDU1_10A+RPD U1_7.5A+RPDU1_5A+RPDU1_3A)] / (RPDU1_15A+RPDU1_10A+RPDU1_7.5A+RPDU1_5A+RPDU1_3A)]≥20%.

[0117] Step 5: Weighted scoring of SSPC configurations is performed based on various evaluation factors in the configuration evaluation system to obtain the configuration design with the best score; the specific contents are as follows:

[0118] 1) There are 819 combinations screened out for the second time, and a parameter combination matrix can be obtained:

[0119]

[0120] 2) Obtaining weighted scoring items for each combination based on the second screening results;

[0121] 3) Assume that the weighting coefficient of the number of boards is k1=0.25, the weighting coefficient of the number of channels is k2=0.35, and the weighting coefficient of the margin of each load specification is k3=0.4;

[0122] 4) The final evaluation score of the combination is calculated by using the weighted coefficient and weighted scoring items.

[0123] The highest-scoring DC SSPC configurations are:

[0124]

[0125] So far, the purpose of the present invention has been achieved.

[0126] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A new DC SSPC configuration design method based on system load requirements, characterized by , including the following steps: Step 1: Use the system load requirement list to sort out the load specifications, quantity of each specification, and location of each load in the aircraft to obtain design constraints; Step 2: Set configuration design principles based on engineering experience and establish a configuration evaluation system; Step 3: Set the SSPC configuration combination range, and obtain all SSPC configuration combinations according to the SSPC configuration combination range; Step 4: Screen the SSPC configuration combinations according to the configuration design principles to obtain the SSPC configuration that meets the requirements; Step 5: Perform weighted scoring on the SSPC configuration using the various evaluation factors in the configuration evaluation system to obtain the configuration design with the best score.

2. A novel DC SSPC configuration design method based on system load requirements according to claim 1, characterized in that: The step 1 specifically includes the following contents: 1) Load specifications mainly include 3A / 5A / 7.5A / 10A / 15A; 2) According to the system load list, the specifications and quantities of each load are N3A / N5A / N7.5A / N10A / N15A; 3) The load location mainly refers to the power distribution product where the SSPC board for load power distribution is located. According to the system load list, the number of specifications of each power distribution product is obtained, that is, RPDU1_15A-RPDU12_15A, RPDU1_10A-RPDU12_10A, RPDU1_7.5A-RPDU12_7.5A, RPDU1_5A-RPDU12_5A, RPDU1_3A-RPDU12_3A.

3. A novel DC SSPC configuration design method based on system load according to claim 2, characterized in that: The design principles in step 2 specifically include the following: 1) From the overall system perspective, the factors that need to be considered mainly include the basic demand for the number of distribution loads; 2) Power limitation of single board; 3) The channel margin of each power distribution product should be higher than 20%; 4) For products with a load margin of less than 30%, an empty card slot should be reserved for subsequent use; 5) The remaining channel specifications of each RPDU product should be able to cover all rated current specifications of the load, and empty card slots should be reserved for products that do not meet the requirements.

4. A novel DC SSPC configuration design method based on system load according to claim 2, characterized in that: The evaluation system in step 2 specifically includes the following contents: 1) Number of boards; 2) Number of channels; 3) Margin for each load specification.

5. A novel DC SSPC configuration design method based on system load according to claim 2, characterized in that: The step 3 specifically comprises the following steps: 1) Establish a configuration item parameter table; 2) The number ranges of low-power boards and high-power boards m(max), m(min), M(max), M(min) should be calculated from the load demand list; 3) The range of the number of low-power boards and high-power single channels n(max), n(min), N(max), N(min) should be derived from the board size and engineering experience.

6. A novel DC SSPC configuration design method based on system load according to claim 2, characterized in that: The step 4 specifically comprises the following steps: 1) The rated number of channels requires consideration of current programmability factors; 2) Establish the SSPC board combination model based on the configuration combination parameter table. To meet the above-mentioned restrictions and narrow the combination range, the constraints can be established as follows: (1)n(min)≤L_3A+L_5A+L_7.5A+L_10A+L_15A≤n(max); (2)N(min)≤H_3A+H_5A+H_7.5A+H_10A+H_15A≤N(max); (3)m(min)+M(min)≤m+M≤m(max)+M(max); (4) L_15A*m+H_15A*M≥N15A; (5)L_15A*m+H_15A*M+L_10A*m+H_10A*M-N15A≥N10A; (6) L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M-(N15A+N10A)≥N7.5A; (7) L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M+L_5A*m+H_5A*M-(N15A+N10A+N7.5A)≥N5A; (8) L_15A*m+H_15A*M+L_10A*m+H_10A*M+L_7.5A*m+H_7.5A*M+L_5A*m+H_5A*M+L_3A*m+H_3A*M-(N15A+N10A+N7.5A+N5A)≥N3A; 3) Assuming that there are k combinations screened out for the first time, a parameter combination matrix can be obtained: 4) Extract P(1) = [m1, n1, ..., H_10A1, H_15A1] from the matrix. Therefore, the second screening problem can be transformed into a ranking combination problem. Place m1 low-power boards and M1 high-power boards into 12 RPDU products, and the load requirements of each RPDU product need to be met. Now assume that the number of low-power boards placed in each RPDU is x1,x2,…,x11,x12; the number of high-power boards placed in each RPDU is y1,y2,…,y11,y12; then the following relationship must be satisfied when selecting the second round of combinations: (1)x1*L_15A1+y1*H_15A>RPDU1_15A; (2) x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A-RPDU1_15A≥RPDU1_10A; (3) x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A-(RPDU1_15A+RPDU1_10A)≥RPDU1_7.5A; (4) x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A-(RPDU1_15A+RPDU1_10A+RPDU1_7.5A)≥RPDU1_5A; (5) x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H _5A+x1*L_3A1+y1*H_3A-(RPDU1_15A+RPDU1_10A+RPDU1_7.5A+RPDU1_5A)≥RPDU1_3A; (6) [x1*L_15A1+y1*H_15A+x1*L_10A1+y1*H_10A+x1*L_7.5A1+y1*H_7.5A+x1*L_5A1+y1*H_5A+x1*L_3A1+y1*H_3A-(RPDU1_ 15A+RPDU1_10A+RPDU1_7.5A+RPDU1_5A+RPDU1_3A)] / (RPDU1_15A+RPDU1_10A+RPDU1_7.5A+RPDU1_5A+RPDU1_3A)]≥20%.

7. A novel DC SSPC configuration design method based on system load according to claim 2, characterized in that: The step 5 specifically includes the following contents: 1) Assuming that there are s combinations screened out for the second time, a parameter combination matrix can be obtained: 2) Obtaining weighted scoring items for each combination based on the second screening results; 3) Assume the weighting coefficient k1 for the number of boards, k2 for the number of channels, and k3 for the margin of each load specification; 4) The final evaluation score of the combination is calculated by using the weighted coefficient and weighted scoring items.

8. A novel DC SSPC configuration design method based on system load according to claim 6, characterized in that: The configuration combination screening method specifically includes the following contents: 5A can be programmed down to 3A, 7.5A can be programmed down to 5A and 3A, 10A can be programmed down to 7.5A and 5A, and 15A can be programmed down to 10A, 7.5A and 5A.

9. A novel DC SSPC configuration design method based on system load according to claim 7, characterized in that: The weighting coefficients are specifically as follows: the recommended value of the weighting coefficient k1 for the number of boards is 0.25, the recommended value of the weighting coefficient k2 for the number of channels is 0.35, and the recommended value of the weighting coefficient k3 for the margin of each load specification is 0.

4.

10. A novel DC SSPC configuration design method based on system load according to claim 7, characterized in that: The weighted calculation evaluation method is specifically as follows: the weighted scoring items are first normalized using the average value, then the weighted scoring values ​​are divided by the weighting coefficient, and finally the weighted scoring values ​​are added together to obtain the final score.

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