Design method of alternating-current excitation variable-speed pumped storage dynamic simulation motor

Abstract

The invention discloses a design method of an alternating-current excitation variable-speed pumping dynamic simulation motor, which belongs to the field of dynamic simulation of a power system, and is consistent with a prototype machine in selection of matching of stator and rotor winding structures and unit motor slots, so that a dynamic simulation machine set can accurately simulate magnetic potential harmonic order of the prototype machine. And the harmonic leakage reactance per unit value of the dynamic simulation prototype is optimized to be consistent with that of the prototype, so that the dynamic simulation unit can simulate the prototype more accurately on the aspect of harmonic characteristics, in addition, the stator and rotor winding structure of the motor is in direct connection with the relay protection mode of the motor, and the reliability of the motor is improved. The stator and rotor winding structure of the dynamic simulation unit designed according to the method provided by the invention is consistent with that of the prototype, so that the relay protection research of the dynamic simulation unit designed according to the method provided by the invention can play a role in guiding the relay protection of the prototype.

Description

Technical Field

[0001] The present invention belongs to the field of dynamic simulation of power systems, and more specifically, relates to a design method for an AC excitation variable speed pumped storage dynamic simulation motor. Background Art

[0002] The power system dynamic simulation system is a scaled-down simulation test system established according to the similarity theorem and the physical properties of the prototype power system. It is an important test tool for power system design and operation characteristic analysis, secondary equipment test and relay protection technology research. By using a small AC excitation motor as a simulation unit to simulate the dynamic and steady-state characteristics of a large-capacity AC excitation motor as a prototype, the dynamic and steady-state characteristics of the large-capacity AC excitation motor can be explored.

[0003] Both the large-capacity AC excitation motor prototype and the small AC excitation dynamic simulation unit are wound-rotor asynchronous motors, but the dynamic simulation unit design process is different from the conventional wound-rotor asynchronous motor design process. The small AC excitation dynamic simulation unit mainly simulates the large-capacity AC excitation motor from the aspects of winding structure, harmonic characteristics, equivalent circuit parameters, etc. At present, the design method of small dynamic simulation units for large steam turbine generators has been proposed, but this method only considers the matching of motor parameters and ignores the simulation of winding structure and harmonic characteristics. In addition, the process of this method is too complicated when using finite element simulation for parameter correction, resulting in a long unit design cycle. In addition, the existing design method of small dynamic simulation units for large steam turbine generators cannot be directly applied to dynamic simulation units with AC excitation. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a design method for an AC excitation variable speed pumped storage dynamic simulation motor, which can accurately simulate a large-capacity AC excitation motor from four aspects: winding structure, harmonic characteristics, mechanical equations and equivalent circuit parameters.

[0005] To achieve the above object, according to a first aspect of the present invention, a method for designing an AC excitation variable speed pumped storage dynamic simulation motor is provided, comprising:

[0006] S1, according to the rated parameters of the prototype of the large-capacity AC excitation motor that the dynamic simulation unit needs to simulate, determine the rated speed, stator and rotor winding connection mode, slot matching, rated capacity, rated voltage and power factor of the dynamic simulation unit; wherein the slot matching of the dynamic simulation unit is the product of its pole pair number and the slot matching of the unit motor of the prototype, the rated capacity and rated voltage are determined according to the capacity of the dynamic simulation test platform and the voltage level of the transformer, the rated speed is determined according to the pole pair number of the dynamic simulation unit, and the stator and rotor winding connection mode and power factor are the same as those of the prototype;

[0007] S2, select the materials of the stator and rotor core silicon steel sheets, windings and shafts; determine the maximum value of the rotor outer diameter and weight of the dynamic simulation unit according to the relationship between the mechanical time constant H of the prototype unit and the mechanical time constant H' of the dynamic simulation unit, and set the rotor outer diameter of the dynamic simulation unit to the maximum value; wherein H'<H, f. GD 2 , S N , n are respectively the frequency, flywheel torque, rated capacity and rated speed of the dynamic simulation unit; GD 2 It is proportional to the rotor outer diameter and weight of the dynamic simulation unit;

[0008] S3, setting the stator and rotor slot type and stator and rotor winding wire diameter of the dynamic simulation unit, and using the winding asynchronous motor parameter analytical calculation method to determine the number of series turns per phase of the stator and rotor of the dynamic simulation unit, the number of parallel windings of the stator and rotor windings, the air gap length optimization range and the slot size optimization range according to the parameters obtained in S1-S2 and the target value of the equivalent circuit parameters of the prototype, and selecting a combination within the air gap length optimization range and the slot size optimization range to obtain a preliminary design scheme of the dynamic simulation unit; wherein the slot size includes the slot width and depth of the stator and rotor, the depth of the stator and rotor slots and the tooth width of the stator and rotor teeth;

[0009] S4. A static field finite element simulation model of the dynamic simulation unit is established according to the preliminary electromagnetic design scheme. With the goal of making the per-unit values ​​of the equivalent circuit parameters of the dynamic simulation unit consistent with those of the prototype, the motor air gap length and the stator and rotor slot dimensions are optimized to obtain the best design scheme for the dynamic simulation unit. The constraint condition is that the weight of the dynamic simulation unit does not exceed the maximum weight.

[0010] According to a second aspect of the present invention, there is provided an electronic device, comprising: a computer-readable storage medium and a processor;

[0011] The computer-readable storage medium is used to store executable instructions;

[0012] The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the method as described in the first aspect.

[0013] According to a third aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a processor to execute the method as described in the first aspect.

[0014] According to a fourth aspect of the present invention, there is provided a computer program product, comprising a computer program or instructions, wherein when the computer program or instructions are executed by a processor, the method according to the first aspect is implemented.

[0015] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0016] 1. The method provided by the present invention is consistent with the prototype in the selection of the stator and rotor winding structure and the unit motor slot matching, so that the dynamic simulation unit can accurately simulate the magnetic potential harmonic order of the prototype, and optimize the harmonic leakage reactance per unit value of the dynamic simulation prototype to be consistent with the prototype. The above two methods are conducive to the dynamic simulation unit to simulate the prototype more accurately in terms of harmonic characteristics. In addition, the stator and rotor winding structure of the motor is directly related to its relay protection mode, and the stator and rotor winding structure of the dynamic simulation unit designed according to the method provided by the present invention is consistent with the prototype. Therefore, the relay protection research on the dynamic simulation unit designed according to the present invention can play a role in guiding the relay protection of the prototype.

[0017] 2. As a further preferred solution, the method provided by the present invention takes into account the rotor winding, shaft weight and end distribution effects when calculating the mechanical time constant and moment of inertia, so that the calculated mechanical time constant and moment of inertia are more accurate, which is conducive to the dynamic simulation unit to more accurately simulate the prototype machine in the mechanical equation.

[0018] 3. As a further preferred scheme, the method provided by the present invention adopts an improved finite element parameter calculation method to optimize the motor air gap length and stator and rotor slot dimensions. The improved finite element parameter calculation method is designed based on static field simulation technology. After simulation verification, the method only requires three static field simulations to complete one motor parameter iteration. It can not only accurately calculate the parameters but also reduce the design cycle of large-capacity AC excitation motor dynamic simulation units, thereby improving the motor design efficiency.

[0019] 4. As a further preferred solution, the method provided by the present invention uses optimization algorithms such as NSGA-Ⅱ algorithm, differential evolution algorithm or particle swarm algorithm to optimize the air gap length and stator and rotor slot size of the motor, which can reduce the time complexity and improve the accuracy of the optimization results.

[0020] In summary, the method provided by the present invention can accurately simulate large-capacity AC excitation motors from four aspects: winding structure, harmonic characteristics, mechanical equations and equivalent circuit parameters, and can significantly improve the design efficiency of dynamic simulation units. It is of great significance for guiding the design of dynamic simulation units of large-capacity AC excitation motors in the dynamic simulation system of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a flow chart of a method for designing an AC excitation variable speed pumped storage dynamic simulation motor provided by an embodiment of the present invention;

[0022] Figure 2A schematic diagram of some parameters of a prototype machine simulated by a dynamic simulation unit provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of some parameters of a unit motor of a prototype machine simulated by a dynamic simulation unit provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of some parameters of a dynamic simulation unit provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram comparing the per-unit values ​​of equivalent circuit parameters of the final solution of the dynamic simulation unit provided in an embodiment of the present invention with the per-unit values ​​of equivalent circuit parameters of the prototype unit. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] The embodiment of the present invention provides a method for designing an AC excitation variable speed pumped storage dynamic simulation motor. Figure 1 As shown, including:

[0028] S1, according to the rated parameters of the prototype of the large-capacity AC excitation motor that the dynamic simulation unit needs to simulate, determine the rated speed, stator and rotor winding connection method, slot matching, rated capacity, rated voltage and power factor of the dynamic simulation unit; wherein the slot matching of the dynamic simulation unit is the product of its pole pair number and the slot matching of the unit motor of the prototype, the rated capacity and rated voltage are determined according to the capacity of the dynamic simulation test platform and the voltage level of the transformer, the rated speed is determined according to the pole pair number of the dynamic simulation unit, and the stator and rotor winding connection method and power factor are the same as those of the prototype.

[0029] In step S1, the number of pole pairs, rated speed, stator and rotor winding connection mode, slot matching, rated capacity, rated voltage and power factor of the dynamic simulation unit are determined according to the rated parameters of the prototype of the large-capacity AC excitation motor that the dynamic simulation unit needs to simulate.

[0030] The rated parameters of the prototype (i.e. electromagnetic scheme) include power factor, slot matching (including the number of stator slots and rotor slots), number of pole pairs and connection method of stator and rotor windings.

[0031] According to the prototype electromagnetic scheme, the slot matching, pole pair number, synchronous speed and connection method of the stator and rotor windings of the prototype unit motor are determined.

[0032] The slot coordination of the dynamic simulation unit is the product of the number of pole pairs of the dynamic simulation unit and the slot coordination of the prototype unit motor; the number of pole pairs of the dynamic simulation unit is set according to actual needs.

[0033] The rated speed is determined based on the number of pole pairs of the dynamic simulation unit and is calculated using a known calculation formula.

[0034] The rated voltage and rated capacity of the dynamic simulation unit are determined according to the voltage level and rated capacity of the transformer step-up transformer group in the dynamic simulation test platform. It can be understood that the dynamic simulation unit is one of the main equipment of the power system dynamic simulation test platform. Its main function is to simulate the dynamic and steady-state characteristics of the prototype in the real power system. The stator side of the dynamic simulation unit in the power system dynamic simulation test platform is connected to the step-up transformer group. The voltage level of the step-up transformer group directly determines the rated voltage of the dynamic simulation unit. The energy absorbed or emitted by the dynamic simulation unit is transmitted through the step-up transformer group, so the capacity of the step-up transformer group determines the selection range of the rated capacity of the dynamic simulation unit. Therefore, once the voltage level and rated capacity of the step-up transformer group are determined, the selection of the rated voltage and rated capacity of the dynamic simulation unit is completed. The voltage level and rated capacity of the step-up transformer group are determined according to the capacity of the entire dynamic simulation test platform. The capacity of the dynamic simulation test platform is generally determined according to experimental requirements, experimental purposes, costs and other conditions.

[0035] S2, select the materials of the stator and rotor core silicon steel sheets, windings and shafts; determine the maximum value of the rotor outer diameter and weight of the dynamic simulation unit according to the relationship between the mechanical time constant H of the prototype and the mechanical time constant H' of the dynamic simulation unit (use it as a constraint to limit the winding weight and rotor outer diameter in the subsequent scheme), and set the rotor outer diameter of the dynamic simulation unit to the corresponding maximum value; wherein, H'<H, f. GD 2 , S N , n are respectively the frequency, flywheel torque, rated capacity and rated speed of the dynamic simulation unit; GD 2 It is proportional to the rotor outer diameter and weight of the dynamic simulation unit.

[0036] A three-dimensional model considering the actual end distribution of the rotor of the dynamic simulation unit is established in the finite element software, and a rotor outer diameter is set. At this time, the shape of the rotor core and the rotor end winding has been determined by the rotor winding connection method and the rotor slot type, so the weight of the rotor part is also determined. The flywheel torque under the rotor outer diameter is calculated, and then the rotor outer diameter is continuously adjusted until the mechanical time constant is smaller than the mechanical time constant of the prototype. The rotor outer diameter at this time is selected as the dynamic simulation motor rotor outer diameter, and the rotor weight at this time is used as the maximum rotor weight in the subsequent optimization process.

[0037] In step S2, the material type of the stator and rotor core silicon steel sheets, windings and shafts is selected according to the cost budget, such as DW315.

[0038] The rotor outer diameter and weight selection range of the dynamic simulation unit are determined according to the mechanical time constant H of the large-capacity AC excitation motor prototype, including: the mechanical time constant H` of the dynamic simulation unit must be less than or equal to the mechanical time constant H of the prototype unit.

[0039] As a preferred solution, when calculating the mechanical time constant H' of the dynamic simulation unit, the weight of the rotor winding and the shaft, and the distribution of the rotor winding end at the rotor core end need to be considered. That is, by setting the density of the silicon steel sheets, windings and selected materials of the stator and rotor core of the dynamic simulation unit, the connection method of the stator and rotor windings, the slot matching, the weight of the rotor winding and the shaft, and the distribution of the rotor winding end at the rotor core end in the finite element software, the real shape of the dynamic simulation unit is restored, and the flywheel torque that conforms to the actual shape of the dynamic simulation unit is obtained through simulation.

[0040] S3, setting the stator and rotor slot types and stator and rotor winding wire diameters of the dynamic simulation unit, and using the winding asynchronous motor parameter analytical calculation method to determine the stator and rotor winding parameters of the dynamic simulation unit (including the number of series turns per phase of the stator, the number of parallel windings of the stator winding, the number of series turns per phase of the rotor, the number of parallel windings of the rotor winding), the air gap length optimization range and the slot size optimization range according to the parameters obtained in S1-S2 and the target values ​​of the equivalent circuit parameters of the prototype, and selecting a combination within the air gap length optimization range and the slot size optimization range to obtain a preliminary design scheme for the dynamic simulation unit; wherein the slot size includes the slot width and depth of the stator and rotor, the depth of the stator and rotor slots, and the tooth width of the stator and rotor teeth.

[0041] Specifically, the stator and rotor slot types and stator and rotor winding wire diameters of the dynamic simulation unit are set; the rotor open-circuit voltage is set based on experience, and the number of series turns of each rotor phase is determined thereby; and based on the parameters obtained from S1-S2 and the target values ​​of the equivalent circuit parameters of the prototype machine, the stator and rotor winding parameters of the dynamic simulation unit (including the number of series turns of each stator phase, the number of parallel windings of the stator winding, the number of series turns of each rotor phase, the number of parallel windings of the rotor winding), the air gap length setting range and the slot size setting range are determined using the wound-rotor asynchronous motor parameter analytical calculation method.

[0042] The rotor open circuit voltage and the number of series turns of each phase of the rotor conform to the relationship:

[0043]

[0044] Among them, U N , U ro , N1, N2, k N1 With kN2 They are the stator rated voltage, rotor open circuit voltage, number of series turns per phase of the stator, number of series turns per phase of the rotor, stator winding coefficient and rotor winding coefficient.

[0045] In step S3, the stator and rotor slot types and the stator and rotor winding wire diameters are set based on experience.

[0046] For example, considering that the simulated motor has low requirements for stator and rotor resistance and high requirements for stator and rotor leakage reactance, the stator and rotor slot type can be set to a semi-closed pear-shaped slot.

[0047] According to the wound-rotor asynchronous motor parameter analytical calculation method and the equivalent circuit parameter target value, the number of series turns per phase of the stator and rotor, the number of parallel windings of the stator and rotor windings, the optimization range of the air gap length and the optimization range of the slot size of the dynamic simulation unit are determined. Among them, the wound-rotor asynchronous motor parameter analytical calculation method is an existing parameter calculation formula, which can quickly calculate the motor equivalent circuit parameters but cannot consider its saturation characteristics. The equivalent circuit parameter target value is the equivalent circuit parameter of a large-capacity AC excitation motor, which is a known value. The excitation reactance and stator and rotor leakage reactance values ​​in the equivalent circuit parameters are related to the number of series turns per phase of the stator and rotor, the number of parallel windings of the stator and rotor windings, the motor air gap length, and the stator and rotor slot size. According to the equivalent circuit parameter target value, the number of series turns per phase of the stator and rotor, the number of parallel windings of the stator and rotor windings, the optimization range of the air gap length and the optimization range of the slot size can be inferred.

[0048] A combination within the above determined motor air gap range and slot size range is selected as the preliminary electromagnetic design scheme for the dynamic simulation unit.

[0049] S4. A static field finite element simulation model of the dynamic simulation unit is established according to the preliminary electromagnetic design scheme. With the goal of making the per-unit values ​​of the equivalent circuit parameters of the dynamic simulation unit consistent with those of the prototype, the motor air gap length and the stator and rotor slot dimensions are optimized to obtain the best design scheme for the dynamic simulation unit. The constraint condition is that the weight of the dynamic simulation unit does not exceed the maximum weight.

[0050] In S4, the dynamic simulation unit is parametrically modeled, a static field finite element simulation model is established, and the objective function is established with the per-unit value of the prototype equivalent circuit parameters as the target. The motor air gap length and stator and rotor slot size parameters are optimized, and the per-unit value of the equivalent circuit parameters of the dynamic simulation unit is optimized to be consistent with that of the prototype.

[0051] Preferably, in step S4, the finite element parameter calculation method is an improved finite element parameter calculation method, in which the leakage reactance parameters in the equivalent circuit parameters are divided into slot leakage reactance, end leakage reactance and harmonic leakage reactance, and the equivalent circuit reactance parameters to be calculated include: excitation reactance, stator slot leakage reactance, stator end leakage reactance, stator harmonic leakage reactance, rotor slot leakage reactance, rotor end leakage reactance and rotor harmonic leakage reactance, and the method includes:

[0052] (1) Calculate the stator and rotor end leakage reactance of the dynamic simulation unit using analytical calculation method;

[0053] (2) Based on the static field simulation technology, the main flux parameters of the winding of the dynamic simulation unit are obtained and the excitation reactance parameters of the dynamic simulation unit are calculated by combining the flux method;

[0054] (3) Based on the static field simulation technology, the magnetic energy storage parameters in the stator and rotor slots of the dynamic simulation unit are obtained and the stator and rotor slot leakage reactance of the dynamic simulation unit is calculated by combining the energy method;

[0055] (4) Based on the static field simulation technology, the full magnetic flux parameters of the winding of the dynamic simulation unit are obtained and the total stator and rotor reactance of the dynamic simulation unit is calculated in combination with the magnetic flux method. The stator and rotor harmonic leakage reactance of the dynamic simulation unit is obtained by subtracting the excitation reactance, stator and rotor slot leakage reactance and stator and rotor end leakage reactance. The stator and rotor harmonic leakage reactance of the dynamic simulation unit is equal to the stator and rotor harmonic leakage reactance of the prototype unit in terms of per unit value.

[0056] The stator and rotor end leakage reactance can be calculated using the following formula:

[0057]

[0058] λ E1 =1.2K dp 2 (d+0.5f d )

[0059] Among them, N, p, K dp , d, f d and E1 They respectively represent the number of series turns per phase of the winding, the number of pole pairs, the fundamental wave winding coefficient, the length of the straight part of the coil extending out of the core, the projection length of the hypotenuse of the winding end on the axis, and the end leakage permeability.

[0060] In step (2), the main flux parameters of the winding of the dynamic simulation unit are obtained based on the static field simulation technology and the excitation reactance parameters of the dynamic simulation unit are calculated by combining the flux method, including in the finite element software, the stator winding is passed through three-phase AC power, the rotor winding is open-circuited, the mutual inductance flux generated by the stator winding in a certain phase winding of the rotor is calculated, and the excitation reactance is calculated using the following formula:

[0061]

[0062]

[0063] Among them, ψ r , m and I represent the mutual inductance flux on the rotor winding, the flux converted to the stator side, and the effective value of the stator phase current respectively.

[0064] The step (3) of obtaining the magnetic energy storage parameters in the stator and rotor slots of the dynamic simulation unit based on the static field simulation technology and calculating the stator and rotor slot leakage reactance of the dynamic simulation unit in combination with the energy method includes: using finite element software to calculate the energy in the stator and rotor slots, and using the following formula to calculate the stator and rotor slot leakage reactance:

[0065]

[0066] Where w is the energy in the stator and rotor slots calculated using finite element method.

[0067] The harmonic leakage reactance calculation method in step (4) includes, taking the calculation of stator harmonic leakage reactance as an example, in finite element software, passing three-phase AC current through the stator, and opening the rotor winding, calculating the magnetic flux of a certain phase winding of the stator, and then calculating the reactance of a certain phase of the stator, and finally obtaining the stator harmonic leakage reactance. The calculation formula used is as follows:

[0068]

[0069] X h =X s -X end -X slot -X m

[0070] Among them, ψ, X s With X h They are the stator phase winding flux, stator reactance and stator harmonic leakage reactance. The calculation method of rotor harmonic leakage reactance is the same as that of stator.

[0071] Preferably, in step S4, an NSGA-Ⅱ algorithm, a differential evolution algorithm or a particle swarm algorithm is used, with the goal of making the per-unit values ​​of the equivalent circuit parameters of the dynamic simulation unit consistent with the per-unit values ​​of the equivalent circuit parameters of the prototype unit, to obtain the optimal values ​​of the motor air gap length and the stator and rotor slot dimensions.

[0072] Taking the NSGA-Ⅱ algorithm as an example, the following objective function is established to optimize the air gap length, stator and rotor slot size parameters, and the number of stator and rotor windings of the motor, and the per-unit value of the equivalent circuit parameters of the dynamic simulation unit is optimized to be consistent with that of the prototype.

[0073] The objective function established is as follows:

[0074] minJ1=X dongtai_σ -X aim_σ

[0075] minJ2=X dongtai_m -X aim_m

[0076] minJ3=X dongtai_harmonic -X aim_harmonic

[0077] J4=m dongtai -m aim ≤0

[0078] Among them, J1, J2, J3 and J4 are objective functions, X dongtai_σ , X dongtai_m and X dongtai_harmonic They are the stator and rotor leakage reactance, excitation reactance and harmonic leakage reactance per unit value of the dynamic simulation unit equivalent circuit, X aim_σ , X aim_m and X aim_harmonic They are the stator and rotor leakage reactance, excitation reactance and harmonic leakage reactance per unit value of the dynamic simulation unit equivalent circuit, m dongtai and m aim They are the weight of the dynamic simulation unit and the maximum optional weight of the dynamic model unit determined by S2.

[0079] According to the range of air gap length, stator and rotor slot width, depth, stator and rotor slot depth and stator and rotor tooth width determined by S3, the upper and lower limits of 9 optimization parameters are set. The above three objective functions are used as optimization targets. The population size is set to 10 times the number of optimization variables. The evolutionary generation is initially set to 50 generations. After observing the changes in the Pareto front every 10 generations, the evolutionary generation is adjusted to improve the optimization efficiency. During the evolution process, the crossover probability between individuals is set to 0.9 and the mutation probability is set to 0.1.

[0080] Take the design of a 300MW prototype dynamic simulation unit as an example. The parameters of the prototype are as follows: Figure 2 As shown, the parameters of the prototype unit motor are as follows Figure 3 As shown in Figure 2, some parameters of the dynamic simulation unit are as follows: Figure 4 As shown, the final solution of the dynamic simulation unit is obtained by using the method provided by the present invention. The comparison data of the equivalent circuit parameter per unit value of the final solution and the prototype parameter per unit value are shown in FIG. Figure 5 As shown, it can be seen that the per-unit values ​​of the equivalent circuit parameters of the dynamic simulation unit designed according to the present invention are close to the per-unit values ​​of the equivalent circuit parameters of the prototype, and the mechanical inertia time constant is smaller than that of the prototype, which meets the design requirements.

[0081] An embodiment of the present invention provides an electronic device, including:

[0082] A computer-readable storage medium and a processor; the computer-readable storage medium is used to store executable instructions;

[0083] The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the method described in any of the above embodiments.

[0084] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the method described in any of the above embodiments.

[0085] An embodiment of the present invention provides a computer program product, including a computer program or instructions, and when the computer program or instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0086] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A design method for an AC excitation variable speed pumped storage dynamic simulation motor, characterized in that: include: S1, according to the rated parameters of the prototype of the large-capacity AC excitation motor that the dynamic simulation unit needs to simulate, determine the rated speed, stator and rotor winding connection mode, slot matching, rated capacity, rated voltage and power factor of the dynamic simulation unit; wherein the slot matching of the dynamic simulation unit is the product of its pole pair number and the slot matching of the unit motor of the prototype, the rated capacity and rated voltage are determined according to the capacity of the dynamic simulation test platform and the voltage level of the transformer, the rated speed is determined according to the pole pair number of the dynamic simulation unit, and the stator and rotor winding connection mode and power factor are the same as those of the prototype; S2, select the materials of the stator and rotor core silicon steel sheets, windings and shafts; determine the maximum value of the rotor outer diameter and weight of the dynamic simulation unit according to the relationship between the mechanical time constant H of the prototype unit and the mechanical time constant H' of the dynamic simulation unit, and set the rotor outer diameter of the dynamic simulation unit to the maximum value; wherein H'<H, f. GD 2 , S N , n are respectively the frequency, flywheel torque, rated capacity and rated speed of the dynamic simulation unit; GD 2 It is proportional to the rotor outer diameter and weight of the dynamic simulation unit; S3, setting the stator and rotor slot type and stator and rotor winding wire diameter of the dynamic simulation unit, and using the winding asynchronous motor parameter analytical calculation method to determine the number of series turns per phase of the stator and rotor of the dynamic simulation unit, the number of parallel windings of the stator and rotor windings, the air gap length optimization range and the slot size optimization range according to the parameters obtained in S1-S2 and the target value of the equivalent circuit parameters of the prototype, and selecting a combination within the air gap length optimization range and the slot size optimization range to obtain a preliminary design scheme of the dynamic simulation unit; wherein the slot size includes the slot width and depth of the stator and rotor, the depth of the stator and rotor slots and the tooth width of the stator and rotor teeth; S4. A static field finite element simulation model of the dynamic simulation unit is established according to the preliminary electromagnetic design scheme. With the goal of making the per-unit values ​​of the equivalent circuit parameters of the dynamic simulation unit consistent with those of the prototype, the motor air gap length and the stator and rotor slot dimensions are optimized to obtain the best design scheme for the dynamic simulation unit. The constraint condition is that the weight of the dynamic simulation unit does not exceed the maximum weight.

2. The method according to claim 1, characterized in that In step S2, the flywheel torque of the dynamic simulation unit is obtained by setting the density, slot matching, and distribution of the rotor winding ends at the rotor core ends of the stator and rotor core silicon steel sheets, windings, and shaft materials of the dynamic simulation unit in the finite element software and performing simulation.

3. The method according to claim 1, characterized in that In step S4, an improved finite element parameter calculation method is used to calculate equivalent circuit parameters of the dynamic simulation unit, including: (1) Calculate the stator and rotor end leakage reactance of the dynamic simulation unit using analytical calculation method; (2) Based on the static field simulation technology, the main flux parameters of the winding of the dynamic simulation unit are obtained and the excitation reactance parameters of the dynamic simulation unit are calculated by combining the flux method; (3) Based on the static field simulation technology, the magnetic energy storage parameters in the stator and rotor slots of the dynamic simulation unit are obtained and the stator and rotor slot leakage reactance of the dynamic simulation unit is calculated by combining the energy method; (4) Based on the static field simulation technology, the full magnetic flux parameters of the winding of the dynamic simulation unit are obtained and the total stator and rotor reactance of the dynamic simulation unit is calculated in combination with the magnetic flux method. The stator and rotor harmonic leakage reactance of the dynamic simulation unit is obtained by subtracting the excitation reactance, stator and rotor slot leakage reactance and stator and rotor end leakage reactance. The stator and rotor harmonic leakage reactance of the dynamic simulation unit is equal to the stator and rotor harmonic leakage reactance of the prototype unit in terms of per unit value.

4. The method according to claim 1 or 3, characterized in that In step S4, the NSGA-Ⅱ algorithm, differential evolution algorithm or particle swarm algorithm is used to obtain the optimal values ​​of the motor air gap length and the stator and rotor slot size with the goal of making the per-unit values ​​of the equivalent circuit parameters of the dynamic simulation unit consistent with the per-unit values ​​of the equivalent circuit parameters of the prototype unit.

5. An electronic device, characterized in that: include: A computer readable storage medium and a processor; The computer-readable storage medium is used to store executable instructions; The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the method according to any one of claims 1 to 4.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the method according to any one of claims 1 to 4.

7. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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