Dimension optimization method of electric reactor

Abstract

The invention relates to the technical field of electric reactor size optimization methods, in particular to an electric reactor size optimization method, which comprises the following steps of: calculating total loss values of a pwm electric reactor, a dvdt electric reactor and an L electric reactor under different working conditions, and taking the total loss value under the maximum working condition as a design value; in the same cabinet body, the positions of the three groups of reactors are adjusted to obtain a centralized three-in-one reactor; respectively simulating the centralized three-in-one electric reactor to obtain the centralized three-in-one electric reactor meeting the heat dissipation requirement; carrying out an experiment on the centralized three-in-one reactor to obtain the centralized three-in-one reactor with a required size; the optimal size of the radiator is calculated, and the same-cabinet centralized three-in-one reactor with the optimal size is obtained; the three-in-one design is carried out on the independently configured pwm reactor, the dvdt reactor and the L reactor, the three reactors are optimally arranged and combined together, the size is compressed, the occupied space is reduced to the maximum extent, and the reactor is better suitable for application of ships.

Description

Technical Field

[0001] The invention belongs to the field of reactor size optimization methods, and in particular relates to a reactor size optimization method. Background Art

[0002] Reactors and filters are necessary components for ship frequency conversion electric control equipment. They play different roles in each branch. The design of reactors is directly related to the power quality and safety of the power grid.

[0003] Battery chopper branch reactor (L reactor): a necessary passive device that constitutes the chopper circuit (Buck-Boost circuit). The switching needs the reactor to store energy in a short time, and also controls the current ripple in the chopper branch; Generator branch dvdt reactor: limits the rising rate of the inverter output voltage and protects the winding insulation of the generator; Daily branch pwm reactor: mainly composed of inductance, capacitance and resistance, used for harmonic suppression in the daily branch;

[0004] The normal structure diagram of pwm reactor, dvdt reactor and L reactor is as follows Figure 1 , Figure 2 and Figure 3 As shown in the figure, it can be seen that before optimization, the PWM reactor, the DVDT reactor and the L reactor are designed in separate cabinets, which have the disadvantages of large size, low space utilization and unreasonable layout. Therefore, it is necessary to design a size optimization method for the reactor to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for optimizing the size of a reactor to solve the problems mentioned in the above background technology that the PWM reactor, DVDD reactor and L reactor on the existing market are designed in single cabinets, with large size, low space utilization and unreasonable layout.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The method for optimizing the size of a reactor comprises the following steps:

[0008] S1. Calculate the total loss value of the PWM reactor, dvdt reactor and L reactor designed by the independent cabinet under different working conditions, and take the total loss value under the maximum working condition as the design value, that is, obtain the maximum heat dissipation value;

[0009] S2. In the same cabinet, adjust the positions of the pwm reactor, dvdt reactor and L reactor according to the requirements to obtain centralized three-in-one reactors of different sizes;

[0010] S3. Simulate centralized three-in-one reactors of different sizes to obtain centralized three-in-one reactors that meet heat dissipation requirements;

[0011] S4. Conduct experiments on the centralized three-in-one reactor that meets the conditions, so that the experimental results are consistent with the simulation results, that is, obtain the centralized three-in-one reactor of the required size;

[0012] S5. Calculate the optimal heat sink size based on the actual heat dissipation of the centralized three-in-one reactor of the required size, that is, obtain the centralized three-in-one reactor of the same cabinet with the optimal size.

[0013] As a further improvement to the present invention, the step of obtaining the maximum total loss value comprises:

[0014] S11, first calculate the current values ​​of the pwm reactor, dvdt reactor and L reactor under different working conditions;

[0015] S12, according to the current values ​​of the PWM reactor, the DCDT reactor and the L reactor calculated under the corresponding working condition, estimating the losses of the PWM reactor, the DCDT reactor and the L reactor under the working condition;

[0016] S13, adding the losses of the PWM reactor, the DCDT reactor and the L reactor under the same working condition to obtain the total loss under the working condition;

[0017] S14. Repeat the above steps to calculate the total loss corresponding to all working conditions, and select the largest total loss value as the design value to obtain the maximum heat dissipation value.

[0018] As a further improvement of the present invention, the pwm reactor, dvdt reactor and L reactor are suitable for three working conditions, which are respectively the shaft generator supplies power to the load, the lithium battery supplies power to the load and the lithium battery provides power to the propeller; the specific calculation method of the current value of the pwm reactor, dvdt reactor and L reactor under the corresponding working conditions is as follows:

[0019] When the shaft-driven generator supplies power to the load, the PWM reactor and the DCDT reactor work, and the L reactor does not work. At this time, the rated power of the shaft-driven motor is 845kW, the rated voltage is 690V, and the power factor is 0.85. At this time, the current of the DCDT reactor is:

[0020]

[0021] The rated output power of the shaft belt motor is 845kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.97. At this time, the current of the PWM reactor is:

[0022]

[0023] When the lithium battery supplies power to the load, the pwm reactor and the L reactor work, and the dvdt reactor does not work. The rated power of the lithium battery pack is 800kW and the rated voltage is 691V. At this time, the current of the L reactor is:

[0024]

[0025] The rated output power of the lithium battery pack is 800kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.97. At this time, the PWM reactor current is:

[0026]

[0027] When the lithium battery provides power for the thruster, the dvdt reactor and the L reactor work, the pwm reactor does not work, the lithium battery pack has a rated power of 800kW and a rated voltage of 691V. At this time, the current of the L reactor is:

[0028]

[0029] The rated output power of the lithium battery pack is 800kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.97. At this time, the dvdt reactor current is:

[0030]

[0031] As a further improvement of the present invention, the loss value of each reactor is estimated based on the principle of conservation of energy: the loss value of each reactor is basically equal to the difference between the input power and the output power of each reactor; the loss value of each reactor is equal to the heat dissipation of each reactor, from which it can be concluded that the heat dissipation of each reactor is equal to the difference between the input power and the output power of each reactor.

[0032] As a further improvement of the present invention, the steps for adjusting the size of the centralized three-in-one reactor are as follows:

[0033] S21. First, according to the project requirements, the maximum occupied area of ​​the centralized three-in-one reactor in the equipment is obtained, that is, the bottom area of ​​the centralized three-in-one reactor in the equipment is obtained;

[0034] S22, secondly, ensure that the heights of the pwm reactor, dvdt reactor and L reactor are consistent;

[0035] S23. Finally, in the same cabinet that meets the maximum occupied area, adjust the positions of the three groups of reactors according to the positions and size restrictions of the power modules, circuit breakers, fuses and other structural parts to ensure that the arrangement directions of the pwm reactor, dvdt reactor and L reactor are 90°, that is, to obtain centralized three-in-one reactors of different sizes.

[0036] As a further improvement of the present invention, the centralized three-in-one reactors of different sizes are simulated, wherein the simulation contents include loss simulation and thermal simulation, and the loss simulation includes iron loss (core loss) and copper loss (winding loss); therefore, the simulation steps of the centralized three-in-one reactor are as follows:

[0037] S31, performing loss simulation;

[0038] S311, use Maxwell software to simulate and model the iron loss of the reactor;

[0039] S312, simplify 3D modeling, retain the magnetic core, winding and other metal parts, and use simplified multi-turn coils for the windings;

[0040] S313, define the core material and construct the BH curve and BP curve;

[0041] S314, add air domain and boundary conditions, and perform meshing;

[0042] S315, applying the current corresponding to each reactor under the corresponding working condition to obtain the iron loss result;

[0043] S316, according to the designed cross-sectional area and length of the copper wire of the reactor winding, and according to the resistivity of the copper material, the resistance value R of the reactor is calculated, and then the current value I passing through the reactor is calculated through I 2 The copper loss of the reactor can be calculated by using R method;

[0044] S317, adding the iron loss and copper loss of the reactor to obtain the total loss of the reactor; repeating the above steps to obtain the total loss of different reactors under the same working condition, and adding the total loss of each reactor to obtain the total loss of the centralized three-in-one reactor of the corresponding size under the same working condition;

[0045] S318. Repeat the above steps to obtain the maximum total loss value of centralized three-in-one reactors of different sizes when working under different working conditions, that is, the maximum heat dissipation of centralized three-in-one reactors of different sizes when working under different working conditions;

[0046] S32, performing thermal simulation;

[0047] S321. Use FLuent software to perform thermal simulation of the reactor and perform model preprocessing first: remove unimportant screws, terminals and other components, and add air domains;

[0048] S322. Define material parameters, including thermal conductivity, specific heat capacity and density;

[0049] S323, performing grid division;

[0050] S324, defining boundary conditions according to the cooling method: including defining the inlet wind speed and inlet temperature for air cooling and defining the water cooling plate temperature for water cooling;

[0051] S325, applying loss to the magnetic core and the winding, that is, applying heating power;

[0052] S326. Calculate and obtain the final temperature and temperature rise of the reactor core and winding to ensure that when the maximum loss value is applied to the centralized three-in-one reactor, the final temperature of the centralized three-in-one reactor does not exceed 145° C. and the temperature rise does not exceed 100K.

[0053] As a further improvement of the present invention, an experiment is conducted on the centralized three-in-one reactor after simulation, and the steps are as follows:

[0054] S41. First, entrust an agent to produce a sample based on the centralized three-in-one reactor that meets the conditions obtained after the above simulation;

[0055] S42, then applying corresponding current to each reactor in the sample according to different working conditions;

[0056] S43, then detecting the initial temperature and final temperature of each reactor under the corresponding current through the temperature sensor, and calculating the final temperature rise of the reactor, to ensure that the final temperature of each group of reactors under the corresponding working condition does not exceed 145°C, and the temperature rise does not exceed 100K;

[0057] S44. Finally, samples that meet the requirements are retained and centralized three-in-one reactors are manufactured and produced.

[0058] As a further improvement of the present invention, the temperature sensor is arranged in the winding of the reactor and installed close to the winding.

[0059] As a further improvement to the present invention, the steps for calculating the optimal size of the radiator are as follows:

[0060] S51. According to the project requirements, after obtaining the size of the reactor with the largest occupied area, the bottom area of ​​the centralized three-in-one reactor is obtained. Under the premise of a certain heat dissipation effect, the heat dissipation and water flow requirements are proportional, and the water flow and the area of ​​the heat sink are proportional. Therefore, the bottom area of ​​the centralized three-in-one reactor is designed to be the bottom area of ​​the heat sink;

[0061] S52, according to the final centralized three-in-one reactor, obtaining the total heat dissipation of the centralized three-in-one reactor;

[0062] S53, according to the total heat dissipation of the centralized three-in-one reactor, the water flow rate of the radiator is calculated, and the calculation formula of the water flow rate is: water flow rate L / min=heat dissipation / specific heat capacity of water / (temperature rise of radiator*60min);

[0063] S54. While ensuring that the bottom area of ​​the radiator of the centralized three-in-one reactor remains unchanged, adjust the height of the radiator to meet the total heat dissipation requirement of the centralized three-in-one reactor, and obtain a radiator of optimal size, that is, obtain a centralized three-in-one reactor of optimal size in the same cabinet.

[0064] As a further improvement of the present invention, the water-cooled heat sink is changed from three-way water inlet to one-way water inlet according to its comprehensive heat dissipation capacity. Factors that need to be considered include space requirements, heat dissipation capacity, water pipe diameter and layout density inside the heat exchanger in the radiator. The minimum water flow rate of the radiator of the centralized three-in-one reactor is 8L / min.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] The present invention integrates independently configured PWM reactor, DVDD reactor and L reactor into a three-in-one design, optimizes the arrangement and combines the three reactors together, compresses the size, reduces the occupied space to the greatest extent, and better adapts to the application of ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0068] Figure 1 This is a schematic diagram of a pwm reactor;

[0069] Figure 2 This is the schematic diagram of the dvdt reactor;

[0070] Figure 3 It is the schematic diagram of L reactor;

[0071] Figure 4 is a schematic diagram of the first working condition;

[0072] Figure 5 is a schematic diagram of the second working condition;

[0073] Figure 6 is a schematic diagram of the third working condition;

[0074] Figure 7 It is a top view schematic diagram of a centralized three-in-one reactor of the present invention;

[0075] Figure 8 It is a front view schematic diagram of a centralized three-in-one reactor of the present invention;

[0076] Fig. 9 It is a left schematic diagram of a centralized three-in-one reactor of the present invention;

[0077] Fig.10 It is a right side schematic diagram of a centralized three-in-one reactor of the present invention;

[0078] Fig.11 It is a schematic diagram of the principle of the centralized three-in-one reactor of the present invention. DETAILED DESCRIPTION

[0079] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with 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.

[0080] The present invention provides the following embodiments:

[0081] The method for optimizing the size of a reactor comprises the following steps:

[0082] S1. Calculate the total loss value of the PWM reactor, dvdt reactor and L reactor designed by the independent cabinet under different working conditions, and take the total loss value under the maximum working condition as the design value, that is, obtain the maximum heat dissipation value;

[0083] S2. In the same cabinet, adjust the positions of the pwm reactor, dvdt reactor and L reactor according to the requirements to obtain centralized three-in-one reactors of different sizes;

[0084] S3. Simulate centralized three-in-one reactors of different sizes to obtain centralized three-in-one reactors that meet heat dissipation requirements;

[0085] S4. Conduct experiments on the centralized three-in-one reactor that meets the conditions, so that the experimental results are consistent with the simulation results, that is, obtain the centralized three-in-one reactor of the required size;

[0086] S5. Calculate the optimal heat sink size based on the actual heat dissipation of the centralized three-in-one reactor of the required size, that is, obtain the centralized three-in-one reactor of the same cabinet with the optimal size.

[0087] The steps to obtain the maximum total loss value include:

[0088] S11, first calculate the current values ​​of the pwm reactor, dvdt reactor and L reactor under different working conditions;

[0089] S12, according to the current values ​​of the PWM reactor, the DCDT reactor and the L reactor calculated under the corresponding working condition, estimating the losses of the PWM reactor, the DCDT reactor and the L reactor under the working condition;

[0090] S13, adding the losses of the PWM reactor, the DCDT reactor and the L reactor under the same working condition to obtain the total loss under the working condition;

[0091] S14. Repeat the above steps to calculate the total loss corresponding to all working conditions, and select the largest total loss value as the design value to obtain the maximum heat dissipation value.

[0092] like Figure 5 , Figure 6 and Figure 7 As shown, the pwm reactor, dvdt reactor and L reactor are suitable for three working conditions, namely, the shaft generator supplies power to the load, the lithium battery supplies power to the load and the lithium battery supplies power to the propeller; the specific calculation method of the current value of the pwm reactor, dvdt reactor and L reactor under the corresponding working conditions is as follows:

[0093] When the shaft-driven generator supplies power to the load, the PWM reactor and the DCDT reactor work, and the L reactor does not work. At this time, the rated power of the shaft-driven motor is 845kW, the rated voltage is 690V, and the power factor is 0.85. At this time, the current of the DCDT reactor is:

[0094]

[0095] The rated output power of the shaft belt motor is 845kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.97. At this time, the current of the PWM reactor is:

[0096]

[0097] When the lithium battery supplies power to the load, the pwm reactor and the L reactor work, and the dvdt reactor does not work. The rated power of the lithium battery pack is 800kW and the rated voltage is 691V. At this time, the current of the L reactor is:

[0098]

[0099] The rated output power of the lithium battery pack is 800kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.97. At this time, the PWM reactor current is:

[0100]

[0101] When the lithium battery provides power for the thruster, the dvdt reactor and the L reactor work, the pwm reactor does not work, the lithium battery pack has a rated power of 800kW and a rated voltage of 691V. At this time, the current of the L reactor is:

[0102]

[0103] The rated output power of the lithium battery pack is 800kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.97. At this time, the dvdt reactor current is:

[0104]

[0105] The loss value of each reactor is estimated based on the principle of conservation of energy: the loss value of each reactor is basically equal to the difference between the input power and the output power of each reactor; the loss value of each reactor is equal to the heat dissipation of each reactor. Therefore, it can be concluded that the heat dissipation of each reactor is equal to the difference between the input power and the output power of each reactor.

[0106] The steps for adjusting the size of a centralized three-in-one reactor are as follows:

[0107] S21. First, according to the project requirements, the maximum occupied area of ​​the centralized three-in-one reactor in the equipment is obtained, that is, the bottom area of ​​the centralized three-in-one reactor in the equipment is obtained;

[0108] S22, secondly, ensure that the heights of the pwm reactor, dvdt reactor and L reactor are consistent;

[0109] S23. Finally, in the same cabinet that meets the maximum occupied area, adjust the positions of the three groups of reactors according to the positions and size restrictions of the power modules, circuit breakers, fuses and other structural parts to ensure that the arrangement directions of the pwm reactor, dvdt reactor and L reactor are 90°, that is, to obtain centralized three-in-one reactors of different sizes.

[0110] The centralized three-in-one reactors of different sizes are simulated, where the simulation content includes loss simulation and thermal simulation. The loss simulation includes iron loss (core loss) and copper loss (winding loss). Therefore, the simulation steps of the centralized three-in-one reactor are as follows:

[0111] S31, performing loss simulation;

[0112] S311, use Maxwell software to simulate and model the iron loss of the reactor;

[0113] S312, simplify 3D modeling, retain the magnetic core, winding and other metal parts, and use simplified multi-turn coils for the windings;

[0114] S313, define the core material and construct the BH curve and BP curve;

[0115] S314, add air domain and boundary conditions, and perform meshing;

[0116] S315, applying the current corresponding to each reactor under the corresponding working condition to obtain the iron loss result;

[0117] S316, according to the designed cross-sectional area and length of the copper wire of the reactor winding, and according to the resistivity of the copper material, the resistance value R of the reactor is calculated, and then the current value I passing through the reactor is calculated through I 2 The copper loss of the reactor can be calculated by using R method;

[0118] S317, adding the iron loss and copper loss of the reactor to obtain the total loss of the reactor; repeating the above steps to obtain the total loss of different reactors under the same working condition, and adding the total loss of each reactor to obtain the total loss of the centralized three-in-one reactor of the corresponding size under the same working condition;

[0119] S318. Repeat the above steps to obtain the maximum total loss value of centralized three-in-one reactors of different sizes when working under different working conditions, that is, the maximum heat dissipation of centralized three-in-one reactors of different sizes when working under different working conditions;

[0120] S32, performing thermal simulation;

[0121] S321. Use FLuent software to perform thermal simulation of the reactor and perform model preprocessing first: remove unimportant screws, terminals and other components, and add air domains;

[0122] S322. Define material parameters, including thermal conductivity, specific heat capacity and density;

[0123] S323, performing grid division;

[0124] S324, defining boundary conditions according to the cooling method: including defining the inlet wind speed and inlet temperature for air cooling and defining the water cooling plate temperature for water cooling;

[0125] S325, applying loss to the magnetic core and the winding, that is, applying heating power;

[0126] S326. Calculate and obtain the final temperature and temperature rise of the reactor core and winding to ensure that when the maximum loss value is applied to the centralized three-in-one reactor, the final temperature of the centralized three-in-one reactor does not exceed 145° C. and the temperature rise does not exceed 100K.

[0127] The steps for conducting experiments on the simulated centralized three-in-one reactor are as follows:

[0128] S41. First, entrust an agent to produce a sample based on the centralized three-in-one reactor that meets the conditions obtained after the above simulation;

[0129] S42, then applying corresponding current to each reactor in the sample according to different working conditions;

[0130] S43, then detecting the initial temperature and final temperature of each reactor under the corresponding current through the temperature sensor, and calculating the final temperature rise of the reactor, to ensure that the final temperature of each group of reactors under the corresponding working condition does not exceed 145°C, and the temperature rise does not exceed 100K;

[0131] S44. Finally, samples that meet the requirements are retained and centralized three-in-one reactors are manufactured and produced.

[0132] The temperature sensor is arranged in the winding of the reactor and installed close to the winding.

[0133] The steps to calculate the optimal size of the radiator are as follows:

[0134] S51. According to the project requirements, after obtaining the size of the reactor with the largest occupied area, the bottom area of ​​the centralized three-in-one reactor is obtained. Under the premise of a certain heat dissipation effect, the heat dissipation and water flow requirements are proportional, and the water flow and the area of ​​the heat sink are proportional. Therefore, the bottom area of ​​the centralized three-in-one reactor is designed to be the bottom area of ​​the heat sink;

[0135] S52, according to the final centralized three-in-one reactor, obtaining the total heat dissipation of the centralized three-in-one reactor;

[0136] S53, according to the total heat dissipation of the centralized three-in-one reactor, the water flow rate of the radiator is calculated, and the calculation formula of the water flow rate is: water flow rate L / min=heat dissipation / specific heat capacity of water / (temperature rise of radiator*60min);

[0137] S54. While ensuring that the bottom area of ​​the radiator of the centralized three-in-one reactor remains unchanged, adjust the height of the radiator to meet the total heat dissipation requirement of the centralized three-in-one reactor, and obtain a radiator of optimal size, that is, obtain a centralized three-in-one reactor of optimal size in the same cabinet.

[0138] According to its comprehensive heat dissipation, the water-cooled heat sink is changed from three-way water inlet to one-way water inlet. Factors that need to be considered include space requirements, heat dissipation, water pipe diameter and layout density inside the heat exchanger in the radiator. The minimum water flow rate of the radiator of the centralized three-in-one reactor is 8L / min.

[0139] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for optimizing the size of a reactor, characterized in that , including the following steps: S1. Calculate the total loss value of the PWM reactor, dvdt reactor and L reactor designed by the independent cabinet under different working conditions, and take the total loss value under the maximum working condition as the design value, that is, obtain the maximum heat dissipation value; S2. In the same cabinet, adjust the positions of the pwm reactor, dvdt reactor and L reactor according to the requirements to obtain centralized three-in-one reactors of different sizes; S3. Simulate centralized three-in-one reactors of different sizes to obtain centralized three-in-one reactors that meet heat dissipation requirements; S4. Conduct experiments on the centralized three-in-one reactor that meets the conditions, so that the experimental results are consistent with the simulation results, that is, obtain the centralized three-in-one reactor of the required size; S5. Calculate the optimal heat sink size based on the actual heat dissipation of the centralized three-in-one reactor of the required size, that is, obtain the centralized three-in-one reactor of the same cabinet with the optimal size.

2. The method for optimizing the size of a reactor according to claim 1, characterized in that ,The steps to obtain the maximum total loss value include: S11, first calculate the current values ​​of the pwm reactor, dvdt reactor and L reactor under different working conditions; S12, according to the current values ​​of the PWM reactor, the DCDT reactor and the L reactor calculated under the corresponding working condition, estimating the losses of the PWM reactor, the DCDT reactor and the L reactor under the working condition; S13, adding the losses of the PWM reactor, the DCDT reactor and the L reactor under the same working condition to obtain the total loss under the working condition; S14. Repeat the above steps to calculate the total loss corresponding to all working conditions, and select the largest total loss value as the design value to obtain the maximum heat dissipation value.

3. The method for optimizing the size of a reactor according to claim 2, characterized in that: PWM reactor, dvdt reactor and L reactor are applicable to three working conditions, namely, the shaft generator supplies power to the load, the lithium battery supplies power to the load and the lithium battery supplies power to the propeller; the specific calculation method of the current value of PWM reactor, dvdt reactor and L reactor under the corresponding working conditions is as follows: When the shaft-driven generator supplies power to the load, the PWM reactor and the DCDT reactor work, and the L reactor does not work. At this time, the rated power of the shaft-driven motor is 845kW, the rated voltage is 690V, and the power factor is 0.

85. At this time, the current of the DCDT reactor is: The rated output power of the shaft belt motor is 845kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.

97. At this time, the current of the PWM reactor is: When the lithium battery supplies power to the load, the pwm reactor and the L reactor work, and the dvdt reactor does not work. The rated power of the lithium battery pack is 800kW and the rated voltage is 691V. At this time, the current of the L reactor is: The rated output power of the lithium battery pack is 800kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.

97. At this time, the PWM reactor current is: When the lithium battery provides power for the thruster, the dvdt reactor and the L reactor work, the pwm reactor does not work, the lithium battery pack has a rated power of 800kW and a rated voltage of 691V. At this time, the current of the L reactor is: The rated output power of the lithium battery pack is 800kW, the rated output voltage is 640V, the power factor is 0.8, and the efficiency of the inverter is 0.

97. At this time, the dvdt reactor current is:

4. The method for optimizing the size of a reactor according to claim 3, characterized in that: The loss value of each reactor is estimated based on the principle of conservation of energy: the loss value of each reactor is basically equal to the difference between the input power and the output power of each reactor; the loss value of each reactor is equal to the heat dissipation of each reactor. Therefore, it can be concluded that the heat dissipation of each reactor is equal to the difference between the input power and the output power of each reactor.

5. The method for optimizing the size of a reactor according to claim 4, characterized in that: The steps for adjusting the size of a centralized three-in-one reactor are as follows: S21. First, according to the project requirements, the maximum occupied area of ​​the centralized three-in-one reactor in the equipment is obtained, that is, the bottom area of ​​the centralized three-in-one reactor in the equipment is obtained; S22, secondly, ensure that the heights of the pwm reactor, dvdt reactor and L reactor are consistent; S23. Finally, in the same cabinet that meets the maximum occupied area, adjust the positions of the three groups of reactors according to the positions and size restrictions of the power modules, circuit breakers, fuses and other structural parts to ensure that the arrangement directions of the pwm reactor, dvdt reactor and L reactor are 90°, that is, to obtain centralized three-in-one reactors of different sizes.

6. The method for optimizing the size of a reactor according to claim 5, characterized in that: The centralized three-in-one reactors of different sizes are simulated, where the simulation content includes loss simulation and thermal simulation. The loss simulation includes iron loss (core loss) and copper loss (winding loss). Therefore, the simulation steps of the centralized three-in-one reactor are as follows: S31, performing loss simulation; S311, use Maxwell software to simulate and model the iron loss of the reactor; S312, simplify 3D modeling, retain the magnetic core, winding and other metal parts, and use simplified multi-turn coils for the windings; S313, define the core material and construct the BH curve and BP curve; S314, add air domain and boundary conditions, and perform meshing; S315, applying the current corresponding to each reactor under the corresponding working condition to obtain the iron loss result; S316, according to the designed cross-sectional area and length of the copper wire of the reactor winding, and according to the resistivity of the copper material, the resistance value R of the reactor is calculated, and then the current value I passing through the reactor is calculated through I 2 The copper loss of the reactor can be calculated by using R method; S317, adding the iron loss and copper loss of the reactor to obtain the total loss of the reactor; repeating the above steps to obtain the total loss of different reactors under the same working condition, and adding the total loss of each reactor to obtain the total loss of the centralized three-in-one reactor of the corresponding size under the same working condition; S318. Repeat the above steps to obtain the maximum total loss value of centralized three-in-one reactors of different sizes when working under different working conditions, that is, the maximum heat dissipation of centralized three-in-one reactors of different sizes when working under different working conditions; S32, performing thermal simulation; S321. Use FLuent software to perform thermal simulation of the reactor and perform model preprocessing first: remove unimportant screws, terminals and other components, and add air domains; S322. Define material parameters, including thermal conductivity, specific heat capacity and density; S323, performing grid division; S324, defining boundary conditions according to the cooling method: including defining the inlet wind speed and inlet temperature for air cooling and defining the water cooling plate temperature for water cooling; S325, applying loss to the magnetic core and the winding, that is, applying heating power; S326. Calculate and obtain the final temperature and temperature rise of the reactor core and winding to ensure that when the maximum loss value is applied to the centralized three-in-one reactor, the final temperature of the centralized three-in-one reactor does not exceed 145° C. and the temperature rise does not exceed 100K.

7. The method for optimizing the size of a reactor according to claim 6, characterized in that: The steps for conducting experiments on the simulated centralized three-in-one reactor are as follows: S41. First, entrust an agent to produce a sample based on the centralized three-in-one reactor that meets the conditions obtained after the above simulation; S42, then applying corresponding current to each reactor in the sample according to different working conditions; S43, then detecting the initial temperature and final temperature of each reactor under the corresponding current through the temperature sensor, and calculating the final temperature rise of the reactor, to ensure that the final temperature of each group of reactors under the corresponding working condition does not exceed 145°C, and the temperature rise does not exceed 100K; S44. Finally, samples that meet the requirements are retained and centralized three-in-one reactors are manufactured and produced.

8. The method for optimizing the size of a reactor according to claim 7, characterized in that: The temperature sensor is arranged in the winding of the reactor and installed close to the winding.

9. The method for optimizing the size of a reactor according to claim 8, characterized in that: The steps to calculate the optimal size of the radiator are as follows: S51. According to the project requirements, after obtaining the size of the reactor with the largest occupied area, the bottom area of ​​the centralized three-in-one reactor is obtained. Under the premise of a certain heat dissipation effect, the heat dissipation and water flow requirements are proportional, and the water flow and the area of ​​the heat sink are proportional. Therefore, the bottom area of ​​the centralized three-in-one reactor is designed to be the bottom area of ​​the heat sink; S52, according to the final centralized three-in-one reactor, obtaining the total heat dissipation of the centralized three-in-one reactor; S53, according to the total heat dissipation of the centralized three-in-one reactor, the water flow rate of the radiator is calculated, and the calculation formula of the water flow rate is: water flow rate L / min=heat dissipation / specific heat capacity of water / (temperature rise of radiator*60min); S54. While ensuring that the bottom area of ​​the radiator of the centralized three-in-one reactor remains unchanged, adjust the height of the radiator to meet the total heat dissipation requirement of the centralized three-in-one reactor, and obtain a radiator of optimal size, that is, obtain a centralized three-in-one reactor of optimal size in the same cabinet.

10. The method for optimizing the size of a reactor according to claim 9, characterized in that: According to its comprehensive heat dissipation, the water-cooled heat sink is changed from three-way water inlet to one-way water inlet. Factors that need to be considered include space requirements, heat dissipation, water pipe diameter and layout density inside the heat exchanger in the radiator. The minimum water flow rate of the radiator of the centralized three-in-one reactor is 8L / min.

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