An optimization control method, system and device for low-voltage high-power motors

Abstract

The present application relates to the field of motor control technology, and specifically to an optimization control method, system and equipment for low-voltage high-power motors, which specifically include: determining the load authenticity of the low-voltage high-power motor according to the output power change and temperature change of the low-voltage high-power motor; determining the load distribution benefit ratio of the low-voltage high-power motor according to the output power change of all stator modules in the low-voltage high-power motor; obtaining the load contribution of the stator module according to the difference between the load of the stator module and the average level and the load distribution benefit ratio of the motor; determining the disabling requirement of each stator module according to the change in the load authenticity and the change in the load contribution, and optimizing the control of the low-voltage high-power motor, reducing the influence of the stator modules running at low load and overload on the motor operation efficiency, significantly improving the performance of the low-voltage high-power motor, and improving the coordination between different stator modules.

Description

Technical Field

[0001] The present application relates to the field of motor control technology, and in particular to an optimization control method, system and device for low-voltage, high-power motors. Background Art

[0002] Low-voltage, high-power motors are widely used in industrial production, transportation, power systems and other fields, especially in modern production lines, mining machinery, ships, electric vehicles and wind power generation. They occupy an indispensable position. With the continuous improvement of energy conservation and emission reduction requirements and the increasing popularity of electrified equipment, how to achieve precise control and optimization of low-voltage, high-power motors while ensuring efficient and reliable operation has become a key problem to improve the level of industrial automation, reduce energy consumption and extend the service life of motors.

[0003] In the modular control process of low-voltage, high-power motors, changes in the load environment of the motor will lead to reduced coordination between different stator modules. It is usually difficult to ensure sufficient response speed and accuracy, and there may be excessive energy consumption, which does not meet the expectations of high-performance and high-efficiency motors. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide an optimization control method, system and device for low-voltage high-power motors. The technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present application provides an optimization control method for a low-voltage high-power motor, the method comprising the following steps:

[0006] During each monitoring period, various operating parameters of the low-voltage high-power motor at each moment are collected, including motor output power, motor temperature, and output power of each stator module of the motor; the rated output power of the motor and the rated output power of each stator module are obtained;

[0007] In each monitoring period, the load change trend of the motor is calculated based on the size and change of the motor output power; the load authenticity of the motor is calculated based on the load change trend of the motor and the motor temperature;

[0008] Calculate the load distribution benefit ratio of the motor based on the difference between the output power of all stator modules and the corresponding rated output power and the output power change of all stator modules;

[0009] Based on the difference between the output powers of the motor stator modules and the difference between each stator module and the overall output power of the motor, combined with the load distribution benefit ratio of the motor, the load contribution of each stator module is calculated; based on the change in the load authenticity of the motor between the current monitoring time period and the previous monitoring time period and the change in the load contribution of each stator module, the disabling requirement of each stator module in the current monitoring time period is calculated;

[0010] Based on the disabling requirement of each stator module, optimized control of the low-voltage high-power motor is performed.

[0011] In one embodiment, the process of acquiring the load change trend of the motor is as follows:

[0012] The ratio between the output power of the motor at each moment and the rated power is calculated and recorded as the first ratio; the variance of the output power of the motor at all moments is calculated; and the fusion value of the variance and all the first ratios of the motor is used as the load change trend of the motor.

[0013] In one embodiment, the expression of the load authenticity of the motor is:

[0014] , where Q represents the load authenticity of the motor, and q represents the load change trend of the motor. Represents the mean value of the motor’s temperature data at all times, Indicates the preset motor temperature threshold.

[0015] In one embodiment, the load distribution benefit ratio of the motor is expressed as:

[0016] , where E represents the load distribution benefit ratio of the motor, and Respectively represent the standard deviation and average value of the output power of all stator modules at all times, Indicates the rated output power of each stator module, is an exponential function with the natural number e as the base, wherein all the moments are all the moments in each monitoring time period.

[0017] In one embodiment, the load contribution of each stator module is expressed as:

[0018] , where represents the load contribution of the e-th stator module, represents the average output power of the e-th stator module at all times, It represents the average output power of all stator modules at all times, E represents the load distribution benefit ratio of the motor, represents the average value of the output power of the vth stator module except the eth stator module at all times, N represents the number of stator modules of the motor, and the all times are all times within each monitoring time period.

[0019] In one embodiment, the process of obtaining the disabling requirement of each stator module in the current monitoring time period is as follows:

[0020] Determine a first difference of the motor in a current monitoring time period based on the load authenticity of each monitoring time period;

[0021] , where Indicates the disabling requirement of the e-th stator module in the current monitoring time period, Represents the normalized value of the first difference of the motor in the current monitoring time period, represents the normalized value of the second difference of the e-th stator module in the current monitoring time period, represents the load contribution of the e-th stator module, Q represents the load authenticity of the motor, is a hyperbolic tangent function; wherein the second difference is the difference between the load contribution of the e-th stator module in the current monitoring time period and the load contribution in the previous monitoring time period.

[0022] In one embodiment, the first difference is the difference between the load authenticity of the motor in the current monitoring time period and the load authenticity of the motor in the previous monitoring time period.

[0023] In one embodiment, the optimization control of the low-voltage high-power motor based on the disabling requirement of each stator module is specifically:

[0024] Calculating an average value of the disabling requirements of all stator modules, and if the average value of the disabling requirements is less than a preset disabling threshold, adding a new stator module for load distribution;

[0025] If the average value of the disabling demand is greater than or equal to the preset disabling threshold, the stator module with the highest disabling demand is set to the "disabled" state, and no load distribution is performed on the stator module in the "disabled" state. Then, the load distribution of the remaining stator modules except the "disabled" stator module is readjusted.

[0026] In a second aspect, the embodiment of the present application further provides an optimization control system for a low-voltage high-power motor, including:

[0027] Motor operation parameter acquisition module: In each monitoring time period, various operation parameters of low-voltage high-power motors are collected at each time, including motor output power, motor temperature, and output power of each stator module of the motor; the rated output power of the motor and the rated output power of each stator module are obtained;

[0028] Motor load analysis module: In each monitoring period, the motor load change trend is calculated based on the size and change of the motor output power; the motor load authenticity is calculated based on the motor load change trend and motor temperature;

[0029] Load sharing evaluation module: Calculates the load sharing benefit ratio of the motor based on the difference between the output power of all stator modules and the rated power, as well as the output power change of all stator modules;

[0030] Motor stator disabling module: Based on the difference between the output powers of the motor stator modules and the difference between each stator module and the overall output power of the motor, combined with the load distribution benefit ratio of the motor, the load contribution of each stator module is calculated; based on the changes in the load authenticity of the motor between the current monitoring period and the previous monitoring period and the changes in the load contribution of each stator module, the disabling requirement of each stator module in the current monitoring period is calculated;

[0031] Motor optimization control module: performs optimization control of the low-voltage high-power motor based on the disabling requirement of each stator module.

[0032] In a third aspect, an embodiment of the present application further provides an optimization control device for low-voltage, high-power motors, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the method described in the first aspect when executing the computer program.

[0033] The embodiments of the present application have at least the following beneficial effects:

[0034] The present application proposes an optimization control method, system and device for low-voltage high-power motors. When performing modular control on the low-voltage high-power motor, the load authenticity of the low-voltage high-power motor is determined according to the output power change and temperature change of the motor, and the load condition of the motor is analyzed; the load distribution benefit ratio of the low-voltage high-power motor is determined according to the output power change of all stator modules in the motor, and the rationality of the load distribution of all stator modules is evaluated, which helps to improve the load distribution effect of the stator modules of the motor; a single stator module is analyzed, and the contribution of the stator module is obtained according to the difference between the load of the stator module and the average level and the load distribution benefit ratio of the motor, so as to reduce The effect of stator modules with too small load on motor energy consumption is reduced; the disabling requirement of each stator module is determined according to the change in the authenticity of the motor load and the change in the load contribution of the stator module between two monitoring time periods, and the matching situation of the motor load change and the load change of each stator module is analyzed; based on the disabling requirement of each stator module, the low-voltage and high-power motor is optimized and controlled, which reduces the effect of stator modules running at low load and overload on the motor operating efficiency, significantly improves the performance of the low-voltage and high-power motor, improves the coordination between different stator modules, improves the response speed and accuracy of the motor, and meets the current industrial demand for efficient and reliable motor drive systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A flowchart of a method for optimizing control of a low-voltage, high-power motor provided by an embodiment of the present application;

[0037] Figure 2 It is a schematic diagram of the output power curve of a low-voltage high-power motor;

[0038] Figure 3 It is a schematic diagram of the output power curve of the stator module;

[0039] Figure 4 This is a schematic diagram of the structure of an optimized control system for low-voltage, high-power motors. DETAILED DESCRIPTION

[0040] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the optimization control method, system and equipment for low-voltage high-power motors proposed in the present application, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0041] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0042] The following is a detailed description of a specific scheme of an optimization control method, system and device for a low-voltage, high-power motor provided by the present application in conjunction with the accompanying drawings.

[0043] See also Figure 1 , which shows a flowchart of a method for optimizing control of a low-voltage high-power motor provided by an embodiment of the present application, the method comprising the following steps:

[0044] Step S1, in each monitoring time period, collect various operating parameters of the low-voltage high-power motor at each moment, including motor output power, motor temperature, and output power of each stator module of the motor; obtain the rated output power of the motor and the rated output power of each stator module.

[0045] The collection of various operating parameters of low-voltage high-power motors is specifically as follows:

[0046] The output power of the motor during operation is collected through a power analyzer, and the temperature of the motor during operation is collected through a temperature sensor on the motor housing to obtain the rated output power of the motor;

[0047] The output power of each stator module during the operation of the motor is collected through a power analyzer, and the rated output power of each stator module is obtained.

[0048] Preferably, in the embodiment of the present application, for the collection of various operating parameters of the motor, the data collection frequency is set to 100 Hz, and the duration of each monitoring time period is set to 5 minutes. As other embodiments of the present application, the implementer can set the data collection frequency and the duration of each monitoring time period according to actual conditions.

[0049] The various operating parameters of the low-voltage high-power motor are normalized by a maximum-minimum normalization algorithm to eliminate the dimension effect.

[0050] Step S2, calculating the load change trend of the motor based on the size and change of the motor output power; calculating the load authenticity of the motor based on the load change trend of the motor and the motor temperature.

[0051] In the process of optimizing the control of low-voltage, high-power motors, in order to achieve optimal control of system performance and efficiency, low-voltage, high-power motors can be controlled modularly, which is called "stator unit modularization". The core idea is to divide the stator part of the motor into multiple independently controllable modules, and dynamically start or disable different numbers of stator units according to actual load requirements, thereby optimizing the performance and efficiency of the motor.

[0052] In the modular design of low-voltage, high-power motors, the stator is divided into multiple independent unit modules. Each stator module can be independently regulated and coordinated through a communication network so that the output characteristics of each module can be flexibly adjusted when the load fluctuates, thereby improving the performance and efficiency of the motor.

[0053] In order to optimize the control method of the low-voltage high-power motor, in each monitoring time period, the ratio between the output power of the low-voltage high-power motor at each moment and the rated power is calculated and recorded as the first ratio; the variance of the output power of the low-voltage high-power motor at all moments is calculated; the fusion value of the variance and all the first ratios of the low-voltage high-power motor is used as the load change trend of the low-voltage high-power motor. The output power curve diagram of the low-voltage high-power motor is shown in the figure below. Figure 2 shown.

[0054] It should be understood that the chaos degree described in the present application refers to the degree of chaos of data distribution, which can be the information entropy, variance, standard deviation, etc. of the data.

[0055] In each monitoring time period, preferably, in one embodiment of the present application, the expression for the load change trend of the low-voltage high-power motor can be: , where q represents the load change trend of low-voltage high-power motor, represents the variance of the output power of the low-voltage high-power motor at all times, represents the output power of the low-voltage high-power motor at the i-th moment, It represents the rated power of the low-voltage high-power motor, and n represents the number of data collection moments.

[0056] In other embodiments of the present application, the expression for the load change trend of the low-voltage high-power motor may be: , where is the normalization function.

[0057] like If the value is greater than 1, it means that the actual power of the low-voltage high-power motor exceeds the rated power. The larger the value, the more likely the motor is in an overloaded state; when the motor is in an overloaded state, it will cause the output power of the motor to fluctuate violently. The larger the value of The larger it is, the more likely the motor is in an overload state, and thus the more obvious the overload trend of the low-voltage, high-power motor is, the larger q is.

[0058] Furthermore, when the temperature of the motor is too high during operation, the motor may also be in an overload state. Therefore, in each monitoring time period, the load authenticity of the low-voltage high-power motor is calculated based on the load change trend of the motor and the temperature of the motor. The expression is:

[0059] , where Q represents the load authenticity of the low-voltage high-power motor, and q represents the load change trend of the low-voltage high-power motor. Represents the mean value of all temperature data of low-voltage high-power motors, Indicates the temperature threshold of a low voltage high power motor.

[0060] Preferably, in the embodiment of the present application, the temperature threshold is set to 90° C. As other embodiments of the present application, the implementer can set the temperature threshold according to the actual situation. The temperature threshold is the maximum temperature value for the low-voltage high-power motor to ensure normal operation.

[0061] If it is greater than 1, it means that the temperature of the motor has exceeded the expected range. The larger the value, the more likely the motor load is in an excessive state; The larger the product of , the higher the authenticity of the motor's overload, that is, the higher the credibility of the motor being in an overload state, and the larger Q.

[0062] Step S3, calculating the load distribution benefit ratio of the motor based on the difference between the output power of all stator modules and the rated power, and the change of the output power of all stator modules.

[0063] When performing modular control on low-voltage, high-power motors, each stator module needs to be regulated according to the real-time load of the motor, so further analysis of each stator module of the motor is required.

[0064] In the modular control process of low-voltage high-power motors, since the core of modularization is to decompose low-voltage high-power motors into multiple independent stator modules, each stator module bears part of the load of the entire low-voltage high-power motor, and the sum of the loads borne by all stator modules is the real load of the low-voltage high-power motor. Improper load distribution of each stator module may cause some stator modules to be overloaded, while other stator modules are in a light-load state. In this application, the load size of each stator module of the motor is characterized by the output power of each stator module of the motor.

[0065] For the stator module of a low-voltage high-power motor, each stator module usually has a rated power. In the embodiment of the present application, the rated power of each stator module is the same. Exceeding the rated power may cause the module to overheat and reduce efficiency. The output power curve diagram of the stator module is shown in FIG. Figure 3 In each monitoring period, based on the difference between the output power of all stator modules and the rated power, as well as the change in the output power of all stator modules, the load distribution benefit ratio of the low-voltage high-power motor is calculated, and the expression is:

[0066] , where E represents the load distribution benefit ratio of low voltage high power motor, Represents the standard deviation of the output power of all stator modules of the low-voltage high-power motor at all times, It represents the average output power of all stator modules of low-voltage high-power motor at all times. Indicates the rated output power of each stator module of a low-voltage high-power motor. is an exponential function with the natural number e as the base. It should be noted that the rated output power of all stator modules is the same.

[0067] When all stator modules of the low-voltage high-power motor are outputting power, if the output power of the stator module is greater than the rated output power and the standard deviation of the output power of all stator modules is large, it means that there are stator modules with high or low loads in the modular control process of the low-voltage high-power motor, and the uneven load distribution of the motor may cause some modules to be overloaded while other modules are in a light-load state; that is, the load distribution benefit is relatively low and E is small.

[0068] Step S4, based on the difference between the output powers of the motor stator modules and the difference between each stator module and the overall output power of the motor, combined with the load distribution benefit ratio of the motor, calculate the load contribution of each stator module; based on the changes in the authenticity of the motor load between the current monitoring time period and the previous monitoring time period and the changes in the load contribution of each stator module, calculate the disabling requirement of each stator module in the current monitoring time period.

[0069] According to the actual load distribution, the control strategy of the motor is optimized to ensure the best operating efficiency under different load conditions, and then further analyze the regulation requirements of the module. In the process of modular control of low-voltage and high-power motors, since each unit module bears a part of the power output of the motor, but in the actual operation process, some units may have a small output, which means that the contribution of the unit module is small, then it may be necessary to disable the unit to reduce energy consumption.

[0070] In each monitoring time period, the load contribution of each stator module of the low-voltage high-power motor is calculated, and the expression is:

[0071] , where represents the load contribution of the e-th stator module of the low-voltage high-power motor, represents the average output power of the e-th stator module of the low-voltage high-power motor at all times, It represents the average output power of all stator modules of low-voltage high-power motor at all times, and E represents the load distribution benefit ratio of low-voltage high-power motor. represents the average value of the output power of the vth stator module of the low-voltage high-power motor except the eth stator module at all times, and N represents the number of stator modules of the low-voltage high-power motor.

[0072] The larger the value of, the greater the power of the stator module is above the average level; if The bigger, The smaller the value, the higher the power of the stator module and the smaller the load difference between the stator module and other stator modules; thus, the higher the load contribution rate of the stator module to the entire low-voltage high-power motor during operation, that is, The bigger.

[0073] Further, the difference between the load authenticity of the low-voltage high-power motor in the current monitoring time period and the load authenticity of the previous monitoring time period is calculated, and recorded as the first difference of the low-voltage high-power motor in the current monitoring time period;

[0074] The difference between the load contribution of any stator module of the low-voltage high-power motor in the current monitoring time period and the load contribution in the previous monitoring time period is calculated, and recorded as the second difference of the stator module in the current monitoring time period.

[0075] Preferably, in an embodiment of the present application, the first difference is the absolute value of the difference between the motor load authenticity in two monitoring time periods; the second difference is the absolute value of the difference between the load contribution of the same stator module in two monitoring time periods.

[0076] Furthermore, the disabling requirement of each stator module of the low-voltage high-power motor in the current monitoring time period is calculated, and the expression is:

[0077] , where Indicates the degree of disabling demand of the e-th stator module of the low-voltage high-power motor in the current monitoring time period. Indicates the normalized value of the first difference of the low-voltage high-power motor in the current monitoring time period, It represents the normalized value of the second difference of the e-th stator module of the low-voltage high-power motor in the current monitoring time period, represents the load contribution of the e-th stator module of the low-voltage high-power motor, Q represents the load authenticity of the low-voltage high-power motor, is the hyperbolic tangent function.

[0078] Preferably, in an embodiment of the present application, the normalization of the first difference is: obtaining the calculation result of an exponential function with a natural number e as the base and the negative of the first difference as the exponent, and taking the difference between the natural number 1 and the calculation result as the normalized value of the first difference. In other embodiments of the present application, there are many existing normalization methods, and the implementer may also use other normalization algorithms to obtain the normalized value of the first difference. The normalized value of the second difference is obtained by the normalization method of the first difference.

[0079] The larger the value, the less the change in the motor output power matches the change in the load contribution of the stator module, which means that when the motor load increases or decreases, the load of the stator module does not increase or decrease accordingly. The smaller the value of The larger the value, the smaller the contribution of the stator module to the load of the low-voltage, high-power motor, and the change in the power load of the motor does not match the change in the load contribution of the stator module, which means that the stator module may be disabled.

[0080] The larger the value, the more it means that during the actual operation of the low-voltage high-power motor, the motor power is within the expected or normal power range, and the load contribution of the stator module in the motor is low, that is, the stator module should be disabled at this time to reduce energy consumption and maintain the efficient operation of the entire motor system. That is, the higher the disabling requirement of the stator module, The bigger.

[0081] Step S5, performing optimization control of the low-voltage high-power motor based on the disabling requirement of each stator module.

[0082] If the disabling requirements of all stator modules are relatively low, a disabling threshold can be set at this time. Preferably, in an embodiment of the present application, the disabling threshold is set to 0.2. As other embodiments of the present application, the implementer can set the disabling threshold according to actual conditions. Calculate the average value of the disabling requirements of all stator modules. When the average value of the disabling requirements is less than the disabling threshold, it means that the motor may be in an overloaded state, which may cause equipment damage or safety accidents. At this time, the load can be shared by increasing redundancy, that is, adding more stator modules to achieve the effect of load distribution. Preferably, in an embodiment of the present application, the number of added stator modules is set to 1. As other embodiments of the present application, the implementer can set the number of added stator modules according to actual conditions.

[0083] If the average value of the disabling demand is greater than or equal to the disabling threshold, the disabling demand of all stator modules in the current monitoring time period is obtained, and then the stator module with the highest disabling demand is selected, and the stator module is set to the "disabled" state, that is, the use of the stator module is stopped, and the load is not distributed to the stator module. Then, the load distribution of the remaining stator modules except the stator module is readjusted to ensure the normal and efficient operation of the motor.

[0084] The modular control of low-voltage, high-power motors can significantly improve motor performance through real-time monitoring, dynamic regulation and intelligent optimization, meeting the modern industry's demand for efficient, reliable and environmentally friendly motor drive systems.

[0085] See also Figure 4 , Figure 4 is a schematic diagram of the structure of an optimized control system for low-voltage high-power motors provided in an embodiment of the present application. In this embodiment, each unit included in the terminal is used to execute each step in an embodiment corresponding to an optimized control method for low-voltage high-power motors. Figure 4 , the optimized control system includes:

[0086] Motor operation parameter acquisition module: In each monitoring time period, various operation parameters of low-voltage high-power motors are collected at each time, including motor output power, motor temperature, and output power of each stator module of the motor; the rated output power of the motor and the rated output power of each stator module are obtained;

[0087] Motor load analysis module: In each monitoring period, the motor load change trend is calculated based on the size and change of the motor output power; the motor load authenticity is calculated based on the motor load change trend and motor temperature;

[0088] Load sharing evaluation module: Calculates the load sharing benefit ratio of the motor based on the difference between the output power of all stator modules and the rated power, as well as the output power change of all stator modules;

[0089] Motor stator disabling module: Based on the difference between the output powers of the motor stator modules and the difference between each stator module and the overall output power of the motor, combined with the load distribution benefit ratio of the motor, the load contribution of each stator module is calculated; based on the changes in the load authenticity of the motor between the current monitoring period and the previous monitoring period and the changes in the load contribution of each stator module, the disabling requirement of each stator module in the current monitoring period is calculated;

[0090] Motor optimization control module: performs optimization control of the low-voltage high-power motor based on the disabling requirement of each stator module.

[0091] Based on the same inventive concept as the above method, an embodiment of the present application also provides an optimization control device for low-voltage, high-power motors, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned optimization control methods for low-voltage, high-power motors are implemented.

[0092] In summary, the embodiment of the present application provides an optimization control method for a low-voltage high-power motor. When the low-voltage high-power motor is modularly controlled, the load authenticity of the low-voltage high-power motor is determined according to the output power change and temperature change of the motor, and the load condition of the motor is analyzed; the load distribution benefit ratio of the low-voltage high-power motor is determined according to the output power change of all stator modules in the motor, and the rationality of the load distribution of all stator modules is evaluated, which helps to improve the load distribution effect of the stator modules of the motor; a single stator module is analyzed, and the contribution of the stator module is obtained according to the difference between the load of the stator module and the average level and the load distribution benefit ratio of the motor. The influence of stator modules with too small load on the energy consumption of the motor is reduced; the disabling requirement of each stator module is determined according to the change in the authenticity of the motor load and the change in the load contribution of the stator module between two monitoring time periods, and the matching situation between the motor load change and the load change of each stator module is analyzed; based on the disabling requirement of each stator module, the low-voltage and high-power motor is optimized and controlled, which reduces the influence of stator modules running at low load and overload on the motor operating efficiency, significantly improves the performance of the low-voltage and high-power motor, improves the coordination between different stator modules, improves the response speed and accuracy of the motor, and meets the current industrial demand for efficient and reliable motor drive systems.

[0093] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. The above-mentioned specific embodiments of the present application are described. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0094] The various embodiments in the present application are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0095] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application should be included in the protection scope of the present application.

Claims

1. An optimization control method for low-voltage high-power motors, characterized in that: The method comprises the following steps: During each monitoring period, various operating parameters of the low-voltage high-power motor at each moment are collected, including motor output power, motor temperature, and output power of each stator module of the motor; the rated output power of the motor and the rated output power of each stator module are obtained; In each monitoring period, the load change trend of the motor is calculated based on the size and change of the motor output power; the load authenticity of the motor is calculated based on the load change trend of the motor and the motor temperature; Calculate the load distribution benefit ratio of the motor based on the difference between the output power of all stator modules and the corresponding rated output power and the output power change of all stator modules; Based on the difference between the output powers of the motor stator modules and the difference between each stator module and the overall output power of the motor, combined with the load distribution benefit ratio of the motor, the load contribution of each stator module is calculated; based on the change in the load authenticity of the motor between the current monitoring time period and the previous monitoring time period and the change in the load contribution of each stator module, the disabling requirement of each stator module in the current monitoring time period is calculated; Optimizing control of the low-voltage high-power motor based on the disabling requirement of each stator module; The load distribution benefit ratio of the motor is expressed as: , where E represents the load distribution benefit ratio of the motor, and Respectively represent the standard deviation and average value of the output power of all stator modules at all times, Indicates the rated output power of each stator module, is an exponential function with the natural number e as the base, wherein all the moments are all the moments in each monitoring time period.

2. The optimization control method for low-voltage high-power motor according to claim 1, characterized in that: The process of acquiring the load change trend of the motor is as follows: Calculate the ratio between the output power of the motor at each moment and the rated power, and record it as the first ratio; Calculate the variance of the motor's output power at all times; and use the fusion value of the variance and all the first ratios of the motor as the load change trend of the motor.

3. The optimization control method for low-voltage high-power motor according to claim 1, characterized in that: The expression of the load authenticity of the motor is: , where Q represents the load authenticity of the motor, and q represents the load change trend of the motor. Represents the mean value of the motor’s temperature data at all times, Indicates the preset motor temperature threshold.

4. The optimization control method for low-voltage high-power motor according to claim 1, characterized in that: The expression of the load contribution of each stator module is: , where represents the load contribution of the e-th stator module, represents the average output power of the e-th stator module at all times, It represents the average output power of all stator modules at all times, E represents the load distribution benefit ratio of the motor, represents the average value of the output power of the vth stator module except the eth stator module at all times, N represents the number of stator modules of the motor, and the all times are all times within each monitoring time period.

5. The optimization control method for low-voltage high-power motor according to claim 1, characterized in that: The process of obtaining the disabling requirement of each stator module in the current monitoring time period is as follows: Determine a first difference of the motor in a current monitoring time period based on the load authenticity of each monitoring time period; , where Indicates the disabling requirement of the e-th stator module in the current monitoring time period, Represents the normalized value of the first difference of the motor in the current monitoring time period, represents the normalized value of the second difference of the e-th stator module in the current monitoring time period, represents the load contribution of the e-th stator module, Q represents the load authenticity of the motor, is a hyperbolic tangent function; wherein the second difference is the difference between the load contribution of the e-th stator module in the current monitoring time period and the load contribution in the previous monitoring time period.

6. The optimization control method for low-voltage high-power motor according to claim 5, characterized in that: The first difference is the difference between the load authenticity of the motor in the current monitoring time period and the load authenticity of the motor in the previous monitoring time period.

7. The optimization control method for low-voltage high-power motor according to claim 1, characterized in that: The optimization control of the low-voltage high-power motor based on the disabling requirement of each stator module is specifically as follows: Calculating an average value of the disabling requirements of all stator modules, and if the average value of the disabling requirements is less than a preset disabling threshold, adding a new stator module for load distribution; If the average value of the disabling demand is greater than or equal to the preset disabling threshold, the stator module with the highest disabling demand is set to the "disabled" state, and the load distribution is not performed on the stator module in the "disabled" state. Then, the load distribution of the remaining stator modules except the "disabled" stator module is readjusted.

8. An optimization control system for low-voltage high-power motors, using the optimization control method for low-voltage high-power motors in claim 1, characterized in that: The system comprises: Motor operation parameter acquisition module: In each monitoring time period, various operation parameters of low-voltage high-power motors are collected at each time, including motor output power, motor temperature, and output power of each stator module of the motor; the rated output power of the motor and the rated output power of each stator module are obtained; Motor load analysis module: calculates the load change trend of the motor based on the size and change of the motor output power; calculates the load authenticity of the motor based on the load change trend of the motor and the motor temperature; Load sharing evaluation module: Calculates the load sharing benefit ratio of the motor based on the difference between the output power of all stator modules and the rated power, as well as the output power change of all stator modules; Motor stator disabling module: Based on the difference between the output powers of the motor stator modules and the difference between each stator module and the overall output power of the motor, combined with the load distribution benefit ratio of the motor, the load contribution of each stator module is calculated; based on the changes in the load authenticity of the motor between the current monitoring period and the previous monitoring period and the changes in the load contribution of each stator module, the disabling requirement of each stator module in the current monitoring period is calculated; Motor optimization control module: performs optimization control of the low-voltage high-power motor based on the disabling requirement of each stator module.

9. An optimization control device for low-voltage high-power motors, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

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