A ship power system reconfiguration method adapted to multiple tasks

Abstract

The application provides a warship power system reconstruction method suitable for multitask, and relates to the field of warship power system reconstruction under the state of battle damage. The specific method comprises the following steps: 1, combining the importance of loads under different task targets and the power characteristics of the loads, the loads are divided into impact loads, flexible loads and other loads; 2, according to the impact load demand of different tasks, the flexible loads are switched in and out when the impact loads are running to ensure the frequency stability of the warship power system; the constraint condition set of the warship power system under different operation tasks is obtained; 3, the warship power system reconstruction under the state of battle damage is realized by taking into account the constraint condition set. The application considers the dynamic division of the load types under different task targets, and guarantees the safe operation of important loads and the frequency stability of the warship power system under different tasks through switching the flexible loads, so that the warship power system reconstruction suitable for multitask is realized.

Description

Technical Field

[0001] The present invention relates to the field of ship power system reconstruction, and in particular to a ship power system reconstruction method adaptable to multiple tasks. Background Art

[0002] Ships inevitably become incomplete due to combat damage during combat missions. This can cause damage to generators, circuits, and loads in the ship's power system, rendering them unable to operate normally. This necessitates network reconstruction, which involves reconnecting intact generators and loads to the system through circuit breaker operations and modifying the system's network structure to ensure the ship's mission execution.

[0003] With the advancement of ship equipment, high-power impact loads, mainly radar, electromagnetic catapults, laser weapons, etc., have gradually increased in the proportion of ship power system loads. Because these loads experience rapid power surges and decreases during operation, they are usually equipped with high-power energy storage systems, such as flywheel energy storage and super-capacity energy storage, during normal operation to prevent sudden power surges from affecting the stability of the ship's power system. However, when the energy storage system supporting the impact loads is damaged, the direct connection of these loads to the system will cause large fluctuations in the frequency of the ship's power system, or even system crashes. Therefore, it is often difficult to operate normally in a damaged state.

[0004] Existing methods for reconfiguring ship power systems often focus solely on maximizing the power of restored loads, without considering the ability of high-power, impactful loads to operate normally. This can lead to ships being unable to complete their missions after reconfiguration. Furthermore, most existing methods employ a fixed load priority ranking, resulting in identical reconfiguration results for different missions under the same damage scenario. This fails to meet the diverse load requirements of different missions, making it difficult to achieve optimal reconfiguration results.

[0005] Therefore, the ship power system reconstruction method considering multi-task adaptability and feasibility plays an important role in enabling ships to continue to perform their assigned tasks in the battle damaged state. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a method for reconfiguring the ship power system that is adaptable to multiple tasks, so that the damaged ship can be optimally reconfigured according to the task requirements, and the important loads can operate normally after the reconstruction.

[0007] The solution of the present invention includes the following contents:

[0008] A method for reconfiguring a ship power system adapted to multiple tasks includes the following steps:

[0009] Step 1: Classify load types based on ship mission objectives: Classify ship mission objectives into navigation, combat, and emergency missions. For each of these three mission objectives, prioritize all loads in the ship's power system according to their importance. Furthermore, based on the importance of each load within the mission objective and its power characteristics, classify the loads into impact loads, flexible loads, and other loads.

[0010] Step 2: Method for maintaining ship power system frequency stability to accommodate multiple types of load access: Based on the ship power system generator and load parameters, obtain the ship power system frequency expression after impact load operation, as well as the frequency expression after flexible load removal based on this. Determine the frequency threshold for flexible load removal based on the ship power system's tolerance, and determine the impact power threshold for flexible load removal based on the frequency expression. Calculate the total impact load power in the ship power system for each mission objective. Divide the total impact load power for each mission objective into equally spaced intervals. For each interval obtained, use a traversal method to obtain the optimal set of flexible load removal amounts that ensures the system frequency meets the requirements.

[0011] Step 3: Shipboard Power System Reconfiguration Objectives and Constraints: Based on the optimal flexible load removal set for each impact interval under each mission objective described in Step 2, a linear fit is performed to obtain the functional relationship between each flexible load removal amount and the impact load power. This functional relationship is used to obtain the flexible load constraints within the shipboard power system constraint set. The constraint set is then combined with the flexible load constraints, generator power constraints, load power constraints, line power constraints, system topology constraints, and power balance constraints. Finally, the shipboard power system network is reconfigured using the objective function of maximizing the total weighted restored load under the specified mission objective.

[0012] Furthermore, the mission objectives described in step 1 include navigation mission e1, combat mission e2, and emergency mission e3. Navigation mission e1 focuses on normal navigation of the ship, with balanced operation of the ship's power system, weapon system, and auxiliary systems. Combat mission e2 focuses on combat operations, with the main operating loads being the weapon system and radar system, with the remaining auxiliary systems and power system as secondary loads. Emergency mission e3 involves the ship encountering an emergency, with the power system, radar system, and defensive weapon system as the main operating loads.

[0013] Furthermore, the ship load priority level in step 1 is determined by the weight of the load under each mission objective. The specific calculation method is:

[0014]

[0015] in, For the load m in the task target e aThe higher the weight value, the higher the priority, and the more important the task target is; The priority of the load m in the task target e a is ranked from high to low, and the importance decreases in turn; N L is the number of loads in the system.

[0016] Further, the power characteristics of the load itself in step 1 are whether the load will produce a large power surge / sudden decrease with extremely fast climbing speed during operation, and whether the load can be cut off / reconnected in a short time. The classification method according to the importance and power characteristics of the load is as follows: the large power load with high importance, power mutation characteristics, and unable to be cut off / reconnected in a short time is classified as an impact load; the load with low importance, no power mutation characteristics, and able to be cut off / reconnected in a short time is classified as a flexible load; and the remaining load is classified as other load.

[0017] The load priority level and the classification according to the importance and power characteristics of the above-mentioned load are two independent attributes of the load, and for different task targets, the two attributes of the same load are different.

[0018] Further, the expression of the system frequency change after the operation of the impact load in step 2 is:

[0019]

[0020] Where Δf is the system frequency change after the operation of the impact load, and the calculation method is the current frequency minus the initial frequency; P im is the power of the operating impact load; t is the time elapsed after the operation of the impact load; D, K G , and T G are the system damping coefficient, frequency response coefficient, and time parameter, respectively, which are inherent parameters of the system; ζ, ω n , and ω r are calculated as follows:

[0021]

[0022]

[0023]

[0024] Where H G is the system inertia, which is an inherent parameter of the system.

[0025] Further, the expression of the system frequency after the connection and disconnection of the flexible load of the impact load in step 2 is:

[0026]

[0027] wherein P fl,i is the cut-off amount of the i-th flexible load; N F is the total number of flexible loads; τ i is the time interval from the operation of the impact load to the cut-off of the i-th flexible load.

[0028] Further, the ship power system bearing capacity in step 2 is the minimum frequency at which the ship power system maintains normal operation, and the value is f min = 49 Hz. Considering the frequency fluctuation during system operation, the cut-off frequency threshold value of the flexible load determined according to the ship power system bearing capacity is f g = 49.5 Hz, that is, when the system frequency drops to 49.5 Hz, the flexible load power is cut off to maintain frequency stability.

[0029] Further, the impact power threshold value of the flexible load cut-off in step 2 is determined according to the frequency expression, and the specific calculation method is to calculate the minimum impact load power P min that needs to be cut off according to the minimum frequency f immin at which the ship power system maintains normal operation and formula (2), and the value is:

[0030]

[0031] Further, the optimal flexible load cut-off amount set in step 2 is the flexible load cut-off amount set that makes the system frequency minimum point just reach the system minimum point that the system can bear, and the calculation method includes the following sub-steps:

[0032] Step 2-1: Add the impact load power in the system under each task target to obtain the total impact load power:

[0033]

[0034] wherein P im,i,N is the rated power of the j-th impact load; j = 1, 2, …, N I , N I is the total number of impact powers.

[0035] Step 2-2: According to the total impact load power P im,sum under each task target in step 2-1, equally divide it into M intervals, and the b-th interval is denoted as [P im,b-1 , P im,b ](b = 1, 2, …, M).

[0036] Step 2-3: For each interval [P im,b-1 , Pim,b ], apply the traversal method to a certain interval ΔP fl,min,i From 0 to P fl,N,i Traverse the possible load shedding power of each flexible load and obtain the maximum frequency change Δf that makes the maximum value of Δf just reach the maximum frequency change Δf that the system can withstand lim The flexible load shedding amount set P fl,lim . Among them, ΔP fl,min,i is the minimum power change that can be adjusted by the flexible load i, P fl,N,i is the rated power of flexible load i (i=1,2…,N F ). Δf lim The maximum frequency change that the system can withstand is usually based on the low-frequency load reduction trigger value of 49Hz, that is, Δf lim =-1Hz. P fllim The expression is:

[0037]

[0038] Where min(·) represents the minimum function; Δf(·) represents the system frequency deviation function determined by equation (6), where the independent variable of the function is the flexible load power P fl,i (i=1,2,…,N F ).

[0039] Furthermore, the calculation method of the functional relationship between the removal amount of each flexibility load and the impact load power in step 3 includes the following sub-steps:

[0040] Step 3-1: For each impact load interval obtained in step 2, the flexible load removal amount set P fllim Perform linear fitting to obtain the linear functional relationship between the flexible loads:

[0041]

[0042] Among them, x i (i=1,2,…,N F ) is the coefficient of flexible load in the relationship and contains a constant term.

[0043] Step 3-2: Based on the coefficient of the flexible load in the relationship formula for each impact load range calculated in Step 3-1, perform linear fitting to obtain its linear function relationship with the impact load power:

[0044] x i =k i P im +b i (11)

[0045] Among them, k i、b i They are respectively the linear term coefficient and the constant term coefficient of the flexible load factor with respect to the impact load power.

[0046] Step 3-3: Combine equations (10) and (11) to obtain the functional relationship between the flexible load removal amount and the impact load power:

[0047]

[0048] Furthermore, the flexible load constraint condition in the ship power system constraint condition set in step 3 is:

[0049]

[0050] Among them, P fl,i (i=1,2,…,N F ) The subscript i represents the sequence number of the flexible load among all flexible loads.

[0051] Furthermore, the impact load P in formula (13) im and flexible load P fl,i (i=1,2,…,N F ) are part of the overall load of the ship.

[0052] Furthermore, in addition to the above-mentioned flexible load constraints, the constraint set in step 3 also includes generator power constraints, load power constraints, line power constraints, and system topology constraints. The specific constraints are as follows:

[0053] The generator power constraint is: the power output by the generator does not exceed its rated power. The specific formula is as follows:

[0054] P G,n ≤P G,N (14)

[0055] Among them, P G,n The power generated by generator n (n=1,2,…,N G ), N G is the total number of generators; P G,N is the rated power of the generator.

[0056] The load power constraint is: the load operating power does not exceed its rated power. The specific formula is as follows:

[0057] P L,m ≤P L,m,N (15)

[0058] {P L,m |m=1,2,…,N L}={P im,j |j=1,2,…,NI}∪{P fl,i |i=1,2,…,N F}∪{other loads} (16)

[0059] Among them, P L，m is the operating power of load m; P L，m，N is the rated power of the load. Formula (16) represents the total load P on the ship L,m (m=1,2,…,N L ) is composed of a set of impact loads P im,j (j=1,2,…,N I ) collection, flexible load P fl,i (i=1,2,…,N F ) collection and other loads. Among them, P im,j represents the operating power of the impact load j. And P L,m The subscript m indicates the load's sequence number among all loads. im,j The subscript j indicates the order of the impact load in the overall impact load. fl,i The subscript i represents the index of the flexible load among all flexible loads. The three have different meanings. The load power constraint applies to all types of loads.

[0060] The line power constraint is: the power transmitted by the line does not exceed its maximum transmission power. The specific formula is as follows:

[0061] L n,m ≤L max (17)

[0062] Among them, L n,m is the power transmitted from generator n to load m; L max is the maximum transmission power of the line.

[0063] The system topology constraint is that any load is connected to the generator through only one of the conventional line and the backup line. The specific constraints are as follows:

[0064] z n,m +z k,m ≤1 (18)

[0065] Among them, z n,m 、z k,m Respectively represent the transmission line flags from generator n and generator k to load m. 1 indicates that the line is connected, and 0 indicates that the line is disconnected. Of the two transmission lines connected to load i, the one that is connected during normal operation is the regular line, and the one that is disconnected during normal operation is the backup line. For some loads on a ship that are only connected to one generator, the above formula is changed to z n,m ≤1.

[0066] The power balance constraint is: the power output of the generator is equal to the sum of the transmission powers of all the lines connected to the generator, and the load power is equal to the sum of the transmission powers of the lines connected to it. The specific constraints are as follows:

[0067]

[0068] P L,m =L n,m z n,m +L k,m z k,m (20)

[0069] Among them, A n Indicates the load number that has a line connection relationship with generator n. In actual calculations, for convenience, the subscripts of L and z can be replaced by the line number.

[0070] Furthermore, the specific expression of the objective function is:

[0071]

[0072] Among them, F a For the mission objective a The objective function expression is as follows. Depending on the task requirements, the objective function Different values ​​will result in different reconstruction results.

[0073] The present invention provides a method for reconfiguring a ship power system that is adaptable to multiple tasks. The method has the following beneficial effects: the method differentiates the priorities and categories of ship loads according to different task objectives; then, considering the existence of high-power important loads that are difficult to access in incomplete ship power systems under different task objectives; a method for maintaining system frequency stability after the access of impact loads is established by switching flexible loads; and finally, the above method is converted into constraint conditions to achieve the reconfiguration of the ship power system that is adaptable to multiple tasks. This method makes full use of the load's adjustable capacity, optimizes the load combination of the reconfigured ship power system, and improves the adaptability of the ship power system to different task objectives.

[0074] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 This is a structural diagram of a ship power system in an embodiment of the present invention;

[0076] Figure 2 Schematic diagram of optimal flexible load removal in an embodiment of the present invention;

[0077] Figure 3The load recovery power after reconstruction in the embodiment of the present invention;

[0078] Figure 4 This is a diagram of the reconstructed system topology in an embodiment of the present invention. DETAILED DESCRIPTION

[0079] The following examples are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0080] The following describes an embodiment of the present invention with reference to the accompanying drawings. For ease of description, this embodiment only shows the reconstruction process under one task objective.

[0081] like Figure 1 The following diagram shows the structure of the ship's power system in an embodiment of the present invention. It includes four generators, 20 loads, and 32 lines. The parameters of the generators and loads are shown in Tables 1 and 2, respectively. The damping coefficient D is set to 1, and the maximum transmission power of each line is 1000 kW.

[0082] Table 1 Generator parameters in the embodiment of the present invention

[0083]

[0084] Table 2 Load parameters in the embodiment of the present invention

[0085]

[0086] Before reconstruction, the system was damaged as follows: the per-unit values ​​of the available capacities of the four generators were 0.5, 1.0, 0.5, and 0, respectively; the faulted lines were G1→L5, G2→L8, G3→L13, and G4→L9; and the damaged loads were L5, L12, L17, and L19. Reconstructing the system network involves the following steps:

[0087] Step 1: Classify the load types according to the ship's mission objectives. The load priorities and load types are shown in Table 2. Load L6 is an impact load, and loads L7 and L9 are flexible loads. Further calculations using Equation (1) yield the following load weights: 0.799, 0.388, 0.668, 0.200, 0.500, 1.000, 0.241, 0.611, 0.359, 0.423, 0.758, 0.303, 0.576, 0.274, 0.696, 0.857, 0.725, 0.142, 0.331, and 0.640.

[0088] Step 2: Frequency stability maintenance method for ship power system adapted to multi-type load access. According to formula (2), the frequency change of the system after the impact load operation in the ship power system is calculated as follows:

[0089]

[0090] The minimum impact load power P required to cut off the flexible load is calculated by formula (6): im,min It is 239kW.

[0091] The process of calculating the optimal set of flexible load shedding amounts consists of the following substeps:

[0092] Step 2-1: In this embodiment, the impact load only includes L6, so the total impact load power in the system is the rated value of L6: 530kW;

[0093] Step 2-2: Divide the impact load L6 into 6 intervals with equal intervals within the range [239kW, 530kW];

[0094] Step 2-3: By traversing the loads L7 and L9 from 0 to 105kW and 250kW respectively, the optimal flexible load shedding amount set in the six intervals is obtained, such as Figure 2 As shown in the figure, the larger the impact load range, the thicker the curve line corresponding to the optimal flexible load removal amount set.

[0095] Step 3: Calculating the functional relationship between the removal amount of each flexible load and the impact load power includes the following sub-steps:

[0096] Step 3-1: Perform linear fitting on the optimal flexible load removal amount in each interval obtained in step 2 to obtain a linear function relationship between each flexible load:

[0097] P fl,9 =x1P fl,7 +x2 (23)

[0098] Step 3-2: Perform linear fitting on the coefficient of the flexible load in the relationship between the impact load ranges calculated in 3-1 to obtain a linear function relationship with the impact load power:

[0099]

[0100] Step 3-3: Perform linear fitting on the coefficient of the flexible load in the relationship formula for each impact load range calculated in 3-1 to obtain its functional relationship with the impact load power:

[0101] P fl,9 =(-0.1867P im -0.9901)P fl,7 +(1.1826P im -0.1684) (25)

[0102] The flexible load constraint condition of the ship power system is obtained from the above functional relationship:

[0103] P fl,9 ≥(-0.1867P im -0.9901)P fl,7 +(1.1826P im -0.1684) (26)

[0104] The other constraints in the constraint set are obtained from the above functional relationship to obtain the flexible load constraint of the ship power system:

[0105] Generator power constraints:

[0106] P G,n ≤1050kW (27)

[0107] Among them, n=1,2,3,4.

[0108] Load power constraint:

[0109] P L,m ≤P L,m,N (28)

[0110] Where m = 1, 2…, 20. L,m,N is the rated power of the generator in Table 2.

[0111] Line power constraints:

[0112] L l ≤1000kW (29)

[0113] Among them, L l for Figure 1 The transmission power of each line is l=1,2,…,32.

[0114] System topology constraints: Figure 1 Each load is connected to the generator via only one of the regular and backup lines. Take load L8 as an example, its regular line is line 11 and its backup line is line 6. Its topology constraints are as follows:

[0115] z 11 +z6≤1 (30)

[0116] Among them, z6, z 11 Respectively represent the line disconnection flags of line 11 and line 6, 1 indicates connection, and 0 indicates disconnection.

[0117] Power balance constraint: Figure 1 Taking generator 1 as an example, the power output by generator 1 is equal to the sum of the power transmitted by all lines connected to the generator:

[0118] P G,1=L1z1+L2z2+L3z3+L4z4+L5z5+L6z6+L7z7+L8z8 (31)

[0119] by Figure 1 Taking medium load L8 as an example, the load power is equal to the sum of the transmission powers of the connected lines:

[0120] P L,8 =L 11 z 11 +L6z6 (32)

[0121] In order to maximize the total weighted recovery load under the specified task objectives, the objective function is:

[0122]

[0123] Among them, ω m is the load weight under the required task objective obtained in step 1.

[0124] Combining the constraint condition set and the objective function, the load recovery power after reconstruction is obtained as Figure 3 As shown, the reconstructed system topology is as follows Figure 4 shown.

[0125] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0126] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A method for reconfiguring a ship power system adapted to multiple tasks, characterized in that: The following steps are involved: Step 1: Divide the ship's mission objectives into navigation missions, combat missions, and emergency missions, and obtain the weights of each load under different mission objectives; at the same time, according to the importance of each load in the mission objectives and its own power characteristics, divide the loads into impact loads, flexible loads, and other loads; Step 2: Determine the minimum impact load power required to remove the flexible load, and calculate the total impact load power of the ship's power system under each mission objective. Divide the total impact load power under each mission objective into equally spaced intervals. For each interval, use the traversal method to obtain the optimal flexible load removal amount set that meets the system frequency requirements. The minimum impact load power P required to cut off the flexible load in step 2 im,min The specific calculation method is as follows: ； f g is the flexible load shedding frequency threshold value determined according to the ship power system’s bearing capacity; P im is the power of the impact load during operation; t is the time after the impact load is operated; D, K G 、T G are the system damping coefficient, frequency response coefficient, and time parameter, respectively. g is the system inertia; 、 、 is calculated as follows: ； ； ； Step 3: Linearly fit the optimal flexible load removal amount set of each impact interval under each mission objective obtained in the previous step with the impact load power to obtain the functional relationship between each flexible load removal amount and the impact load power, and obtain the flexible load constraint conditions in the ship power system constraint condition set through this functional relationship; and combine the flexible load constraint, generator power constraint, load power constraint, line power constraint, and system topology constraint to obtain the constraint condition set; specify the total weighted restored load under the mission objective as the objective function, and finally, under the premise of meeting all constraints, obtain the operating power of each load when the objective function is maximized to realize the reconstruction of the ship power system network.

2. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 1, characterized in that: The power characteristics of the load itself described in step 1 are manifested in whether the load will produce a large power surge / decrease with an extremely fast climbing speed when running, and whether it can be cut off / re-thrown in a short time. According to the classification method of load importance and its own power characteristics, it is specifically manifested as follows: high-power loads with high importance under the task target, power mutation characteristics, and cannot be cut off / re-thrown in a short time are classified as impact loads; loads with low importance under the task target, no power mutation characteristics, and can be cut off / re-thrown in a short time are classified as flexible loads; and the remaining loads are classified as other loads; the load priority level of the load and the classification according to the type of importance and power characteristics are two independent attributes of the load, and for different task targets, the two attributes of the same load will be different.

3. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 1, characterized in that: The weights of each load in step 1 under different task objectives are given by The specific calculation method is: ； in, For the load m in the task target e a The weight under the task, the higher the weight value, the higher the priority and the more important it is under the task goal; For the load m in the task target e a The priority order is from small to large and the importance is reduced in turn, and the user arranges it according to their needs; N L is the number of loads in the system.

4. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 1, characterized in that: The optimal flexible load shedding amount set in step 2 is the flexible load shedding amount set that makes the lowest point of the system frequency just reach the lowest point that the system can withstand. The specific calculation method includes the following sub-steps: Step 2-1: Add the impact load power in the system under each task target to obtain the total impact load power: ； Among them, P im,j,N is the rated power of the jth impact load; j=1,2,…,N I ,N I is the total impact power; Step 2-2: The total impact load power P under each task target obtained in the previous step im,sum The interval is divided into M intervals, and the bth interval is recorded as [P im,b-1 ,P im,b ](b=1,2,…,M); Step 2-3: For each interval [P im,b-1 ,P im,b ], using the traversal method to obtain the fl,min,i From 0 to P fl,N,i Traverse the possible load shedding power of each flexible load and obtain the maximum frequency change Δf that makes the maximum value of Δf just reach the maximum frequency change Δf that the system can withstand lim The flexible load shedding amount set P fl,lim , where ΔP fl,min,i is the minimum power change that can be adjusted by the flexible load i, P fl,N,i is the rated power of flexible load i, Δf lim The maximum frequency change that the system can withstand; P fl,lim The expression is: ； Where min(·) represents the minimum function; Δf(·) represents the system frequency deviation function, and the flexible load power P fl,i is the independent variable.

5. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 1, characterized in that: The method for calculating the functional relationship between the removal amount of each flexible load and the impact load power in step 3 includes the following sub-steps: Step 3-1: Determine the amount of flexible load removal The linear functional relationship between the flexible load removal amount set in each impact load interval obtained in step 2 is: ； Flexible load removal Perform linear fitting with the flexible load removal amount set under each impact load interval to obtain the coefficients x of the flexible load in the relationship i ,i=1,2,…,N F ; Step 3-2: Determine the linear function relationship for the impact load power: ； x i With P im Perform linear fitting to obtain the first-order coefficient k i and constant term coefficient b i The value of P im The power of the impact load during operation; Step 3-3: Get the Substitute the formula into the formula in step 3-1 to obtain the functional relationship between the flexible load removal amount and the impact load power: 。 6. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 5, characterized in that: The flexible load constraints in the ship power system constraint set in step 3 are: ； Among them, P fl,i (i=1,2,…,N F ) indicates the sequence number of the flexible load in all flexible loads; the impact load P im and flexible load P fl,i (i=1,2,…,N F ) are part of the overall load of the ship.

7. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 6, characterized in that: The constraints in step 3 also include generator power constraints, load power constraints, line power constraints, and system topology constraints. The specific constraints are as follows: The generator power constraint is: the power output by the generator does not exceed its rated power. The specific constraint formula is as follows: ； Among them, P G,n The power output of generator n (n=1,2,…,N G ), N G is the total number of generators; P G,N is the rated power of the generator; The load power constraint is: the load operating power does not exceed its rated power. The specific constraint formula is as follows: ； ； Among them, P L,m is the operating power of load m; P L,m,N is the load rated power, indicating all loads P on board L,m (m=1,2,…,N L ) is composed of the impact load P im,j (j=1,2,…,N I ) collection, flexible load P fl,i (i=1,2,…,N F ) collection and other loads, among which P im,j represents the operating power of the impact load j; and P L,m The subscript m indicates the load's sequence number among all loads. im,j The subscript j indicates the order of the impact load in the overall impact load. fl,i The subscript i indicates the serial number of the flexible load among all flexible loads. The load power constraint is valid for all types of loads. The line power constraint is: the power transmitted by the line does not exceed its maximum transmission power. The specific constraint formula is as follows: ； Among them, L n,m is the power transmitted from generator n to load m; L max is the maximum transmission power of the line; The system topology constraint is that any load is connected to the generator through only one of the conventional line and the backup line. The specific constraint formula is as follows: ； Among them, z n,m 、z k,m Respectively represent the flags of the transmission lines from generator n and generator k to load m. 1 indicates that the line is connected, and 0 indicates that the line is disconnected. Of the two transmission lines connected to load i, the one that is connected during normal operation is the regular line, and the one that is disconnected during normal operation is the backup line. For some loads on a ship that are only connected to one generator, Change to ; The power balance constraint is: the power output of the generator is equal to the sum of the transmission powers of all the lines connected to the generator, and the load power is equal to the sum of the transmission powers of the lines connected to it. The specific constraint formula is as follows: ； ； Among them, A n Indicates the load number that has a line connection relationship with generator n. In actual calculations, for convenience of expression, the subscripts of L and z can be replaced by the line number.

8. The method for reconfiguring a ship power system adapted to multiple tasks according to claim 1, characterized in that: The specific expression of the objective function in step 3 is: ； Among them, F a For the mission objective a The objective function expression is as follows: For the load m in the task target e a The weight under L,m is the operating power of load m, and is the final solution.

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