Micromotor load sensing method and system, medium and electronic equipment

Abstract

The invention relates to the technical field of micromotor load sensing, and discloses a micromotor load sensing method and system, a medium and electronic equipment. A micromotor load sensing method comprises the following steps: acquiring voltage and current accessed to a load in real time, and removing bias to obtain an actual voltage and current sampling value sequence curve; calculating a voltage effective value, a current effective value, active power and a power factor according to the voltage and current sampling value sequence curve, and drawing a corresponding change curve; according to the voltage effective value, the current effective value, the active power and the change of the power factor, identifying a transient starting characteristic and a transient starting characteristic respectively; and judging the type of the loaded micromotor according to an identification result, and placing a micromotor load label symbol. According to the invention, the identification efficiency and accuracy of the micromotor load are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of micro motor load sensing, in particular to a micro motor load sensing method, system, medium and electronic device. BACKGROUND

[0002] The characteristics of the electrical load appliances connected by the Internet of Things intelligent circuit breaker are different, and the accurate sensing of the load can quickly improve the control and protection decision strategy of the system. At present, there are mature recognition methods for the electric charging vehicles and malignant loads of the load, but there is still a lack of necessary sensing method for the recognition of micro motor load, and it is urgently needed to sense and accurately identify the characteristics of the micro motor load to improve the decision performance of the control small circuit breaker.

[0003] Therefore, the present application provides a micro motor load sensing method, system, medium and electronic device. SUMMARY

[0004] (I) Technical problems to be solved In view of the deficiencies in the prior art, the present application provides a micro motor load sensing method, system, medium and electronic device.

[0005] (II) Technical solutions In order to solve the above problems, the present application provides the following technical solutions: A micro motor load sensing method, comprising: real-time acquisition of voltage and current of the connected load, and removal of bias to obtain actual voltage and current sample value sequence curves; calculating the voltage effective value, current effective value, active power and power factor according to the voltage and current sample value sequence curves, and drawing the corresponding change curves; identifying the transient start characteristic and transient start characteristic according to the changes of the voltage effective value, current effective value, active power and power factor, respectively; determining the micro motor type of the load according to the identification result, and placing the micro motor load label symbol.

[0006] Preferably, the real-time acquisition of voltage and current of the connected load, and removal of bias to obtain actual voltage and current sample value sequence curves, specifically comprises: subtracting the bias value 3010 set in the acquisition circuit from the real-time acquired voltage discrete value to obtain the actual voltage sample value sequence curve; subtracting the bias value 2000 set in the acquisition circuit from the real-time acquired current discrete value to obtain the actual current sample value sequence curve; storing the voltage sample value sequence curve and the current sample value sequence curve.

[0007] Preferably, the calculation of the voltage effective value, the current effective value, the active power and the power factor according to the voltage and current sampling value sequence curve is performed, and the corresponding change curve is drawn, specifically including: According to the real-time voltage and current sampling value sequence curve, the root mean square value method is used to calculate the voltage effective value and the current effective value of each sampling point, and the continuous voltage effective value change curve and the current effective value change curve are obtained; According to the real-time voltage and current sampling value sequence curve, the instantaneous power is subjected to periodic average operation to obtain the active power value of each sampling point, and the active power change curve is formed; The power factor corresponding to each sampling point is calculated by the active power, and the power factor change curve is formed, and the mathematical expression of the power factor corresponding to each sampling point is calculated as: (1) In formula (1), is the power factor, is the power, is the voltage, is the current.

[0008] Preferably, the transient starting characteristics and the transient starting characteristics are identified according to the changes of the voltage effective value, the current effective value, the active power and the power factor, specifically including: When the current effective value is greater than or equal to the incremental constant value, it is determined that the load is connected; the load connection time is The corresponding current effective value is recorded as The active power is recorded as The voltage effective value is recorded as The power factor is recorded as ; In the transient starting process of the micro-motor load, the impulse rise satisfies the following characteristics: A. In the transient starting process of the micro-motor load, the power impulse rises twice; B. The absolute value of the first power impulse rise in the transient starting process of the micro-motor load is greater than the absolute value of the second power impulse; After the impulse rise in the transient starting process of the micro-motor load, the micro-motor load enters the transient starting process, and whether it satisfies the characteristics is judged; After the starting is completed, the motor enters the normal running state.

[0009] Preferably, in the transient starting process of the micro-motor load, the rise value of the impulse satisfies the following mathematical expression: (2) In formula (2), is a given time limit value, the active power is from Impulse climbs to Period is to .

[0010] Preferably, after the micro-mechanical load transient starting impulse climbs, the micro-mechanical load enters a micro-mechanical load temporary stable starting process, and it is judged whether the characteristics are met, specifically including: The period in which the micro-mechanical load enters the temporary stable starting process is to The active power, current effective value, voltage effective value, and power factor meet the following mathematical expressions: (3) In formula (3), is the longest starting time threshold of the micro-mechanical load, is the shortest starting time threshold of the micro-mechanical load.

[0011] Preferably, the threshold of the micro-mechanical load can be set and adjusted online to meet the needs of different working conditions.

[0012] A micro-mechanical load sensing system comprises: A signal acquisition module for real-time acquisition of voltage and current signals of the load; A signal processing module comprising a signal preprocessing unit and a signal processing unit; the signal processing module receives data information of the signal acquisition module and performs data processing; the signal preprocessing unit is used to remove the bias value of the voltage and current signals to obtain the actual voltage and current sampling value sequence curve; the signal processing unit receives data information of the signal preprocessing unit and performs data processing to obtain the voltage effective value, current effective value, active power, and power factor and their change curves; A feature recognition module that receives data information of the signal processing module and performs feature recognition to determine whether it is a micro-mechanical load; A communication module for transmitting real-time change curves, recognition results, and micro-mechanical load label symbols to a remote server; A storage module for storing real-time and historical change curves, recognition results, and micro-mechanical load label symbols.

[0013] A computer-readable storage medium, the storage medium stores a computer program, the computer program is executed by a processor, and is used to implement the above-mentioned micro-mechanical load sensing method; An electronic device comprises: One or more processors; A memory for storing one or more computer programs; When the one or more programs are executed by the one or more processors, the one or more processors are caused to perform the above-mentioned micro-motor load sensing method.

[0014] (Three) beneficial effects Compared with the prior art, the present application provides a micro-motor load sensing method, system, medium and electronic device, which has the following beneficial effects: 1. The method realizes online accurate sensing of the micro-motor load by capturing the unique transient characteristics of the two power impulse climbs in the micro-motor starting process, and combining multi-parameter collaborative determination of voltage, current and power factor. 2. The method can make the circuit breaker match the exclusive control and protection strategy by accurately determining the micro-motor load type.

[0015] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which: Figure 1 It is a flowchart of the present application; Figure 2 It is a schematic diagram of the original sampling value curve of voltage and current during the starting process of the air conditioner of the present application; Figure 3 It is a schematic diagram of the real-time curve after the original sampling value of voltage and current during the starting process of the air conditioner of the present application is subtracted by the offset; Figure 4 It is a schematic diagram of the effective value curve of voltage and current during the starting process of the air conditioner of the present application; Figure 5 It is a schematic diagram of the active power change curve during the starting process of the air conditioner of the present application; Figure 6 It is a schematic diagram of the power factor curve during the starting process of the air conditioner of the present application; Figure 7 It is a starting waveform schematic diagram of the washing machine of the present application; Figure 8 It is a starting waveform schematic diagram of the range hood of the present application; Figure 9 It is a starting waveform schematic diagram of the refrigerator of the present application. DETAILED DESCRIPTION

[0017] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0018] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0020] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] The present application provides a new technical solution: a micro motor load sensing method, comprising: Real-time acquisition of the voltage and current of the access load, and removal of the bias to obtain the actual voltage and current sample value sequence curve; According to the voltage and current sample value sequence curve, the voltage effective value, the current effective value, the active power and the power factor are calculated, and the corresponding change curve is drawn; According to the change of the voltage effective value, the current effective value, the active power and the power factor, the transient starting characteristic and the transient starting characteristic are identified respectively; According to the identification result, the micro motor type of the load is determined, and a micro motor load label symbol is inserted.

[0022] In the application, the voltage and current of the access load are collected in real time, and the actual voltage and current sample value sequence curves are obtained after removing the bias, specifically including: The real-time collected voltage discrete value is subtracted by the bias value 3010 set in the collection circuit, to obtain the actual voltage sample value sequence curve; The real-time collected current discrete value is subtracted by the bias value 2000 set in the collection circuit, to obtain the actual current sample value sequence curve; The voltage sample value sequence curve and the current sample value sequence curve are stored.

[0023] In the application, the voltage effective value, current effective value, active power and power factor are calculated according to the voltage and current sample value sequence curves, and the corresponding change curves are drawn, specifically including: According to the real-time voltage and current sample value sequence curves, the root mean square value method is used to calculate the voltage effective value and current effective value of each sampling point, and the continuous voltage effective value change curve and current effective value change curve are obtained; According to the real-time voltage and current sample value sequence curves, the instantaneous power is subjected to periodic average operation to obtain the active power value of each sampling point, and the active power change curve is formed; The power factor corresponding to each sampling point is calculated through the active power, and the power factor change curve is formed, and the mathematical expression of the power factor corresponding to each sampling point is calculated as: (1) In formula (1), is the power factor, is the power, is the voltage, is the current.

[0024] In the application, the transient start-up characteristics and the transient start-up characteristics are identified according to the changes of the voltage effective value, the current effective value, the active power and the power factor, specifically including: When the current effective value is greater than or equal to the incremental constant value, it is determined that the load is connected; the load connection time is The corresponding current effective value is recorded as The active power is recorded as The voltage effective value is recorded as The power factor is recorded as ; In the transient start-up process of the micro motor load, the impulse rise satisfies the following characteristics: A. In the micro motor load start-up, the power impulse climbs twice; B. In the micro motor load start-up, the absolute value of the first power impulse climb is greater than the absolute value of the second power impulse; After the impulse climb in the micro motor load transient start-up, the micro motor load enters the temporary stable start-up process, and it is determined whether the characteristics are met; After the start-up is completed, the motor enters a normal operation state.

[0025] In the embodiment, the mathematical expression for determining the load access is: (4) In formula (4), is the current effective value increment, is the current effective value increment setting value, is the current effective value calculated by the nth current sampling value, is the current effective value calculated by the n+1th current sampling value; In the present application, the impulse climb value in the micro motor load transient start-up process satisfies the following mathematical expression: (2) In formula (2), is a given time limit value, the active power is from to The time period is to .

[0026] In the embodiment, the start-up process of the air conditioner is taken as an example, as shown in Figures 2~6 , with the access of the load, the active power rapidly rises from , and the mathematical expression of the active power increment slope is: (5) In the first impulse power climb in the micro motor start-up transient, the active power increment slope is greater than 80°, and the instantaneous rise is to , after that, the active power increment slope becomes negative, and the first impulse power climb in the micro motor start-up transient is to the basic value , which corresponds to This time sequence is recorded as , and the current effective value is recorded as ; After the active power increment slope increment becomes negative, it quickly reaches the active power increment slope , which again becomes positive At the moment, the second impulse power of the micro motor enters the starting transient state, the active power increment slope rapidly rises to the maximum power in the starting process , the time sequence is recorded as At the moment, the current effective value also reaches the maximum value , then The negative value appears , the power The value decreases slightly, the current effective value decreases slightly, and the starting transient process is reached; corresponding to the change of the time sequence, the power factor also rises from the minimum value at the moment to At the moment , with the second impulse of the micro motor, the power factor also rapidly rises to the maximum value , and then enters the transient process.

[0027] In the application, after the micro motor load transient starting impulse rises, the micro motor load enters the micro motor load transient starting process, and whether the characteristics are met is judged, which specifically includes: The period when the micro motor load enters the transient starting process is to , the active power, the current effective value, the voltage effective value and the power factor satisfy the following mathematical expressions: (3) In formula (3), is the longest starting time threshold of the micro motor, is the shortest starting time threshold of the micro motor.

[0028] In the embodiment, after , to The period is the starting completion stage, the starting power decreases from to , the starting current decreases from to , the voltage rises from to , the power factor remains almost unchanged, the starting is completed, and the motor enters the normal running state.

[0029] In the application, the threshold of the micro motor load can be set and adjusted online to meet the needs of different working conditions.

[0030] In the embodiment, the starting processes of the washing machine, the range hood and the refrigerator are as shown in Figures 7~9 .

[0031] A micro motor load sensing system comprises: A signal acquisition module is configured to acquire voltage and current signals of the load in real time. a signal processing module, comprising a signal preprocessing unit and a signal processing unit; the signal processing module receives data information of the signal acquisition module and performs data processing; the signal preprocessing unit is used for removing bias values of voltage and current signals to obtain actual voltage and current sampling value sequence curves; the signal processing unit receives data information of the signal preprocessing unit and performs data processing to obtain voltage effective value, current effective value, active power and power factor and their change curves; a feature recognition module, which receives data information of the signal processing module and performs feature recognition to determine whether it is a micro motor load; a communication module, which is used for transmitting real-time change curves, recognition results and micro motor load label symbols to a remote server; a storage module, which is used for storing real-time and historical change curves, recognition results and micro motor load label symbols.

[0032] A computer readable storage medium, the storage medium stores a computer program, the computer program is executed by a processor to implement the micro motor load sensing method described above; An electronic device, comprising: one or more processors; a memory for storing one or more computer programs; wherein when the one or more programs are executed by the one or more processors, the one or more processors execute the micro motor load sensing method described above.

[0033] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] Although the embodiments of the present application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for load sensing in a micromachine, characterized by, The method comprises the following steps: Real-time acquisition of voltage and current of the connected load, and removal of bias to obtain actual voltage and current sample value sequence curves; Calculation of voltage effective value, current effective value, active power and power factor according to the voltage and current sample value sequence curves, and drawing of the corresponding change curves; Identification of transient starting characteristics and transient starting characteristics according to the changes of voltage effective value, current effective value, active power and power factor; Determination of the micro-motor type of the load according to the identification result, and placement of a micro-motor load label symbol.

2. The load sensing method of claim 1, wherein, The real-time acquisition of voltage and current of the connected load, and removal of bias to obtain actual voltage and current sample value sequence curves, specifically comprises: Subtracting the bias value 3010 set in the acquisition circuit from the real-time acquired voltage discrete value to obtain the actual voltage sample value sequence curve; Subtracting the bias value 2000 set in the acquisition circuit from the real-time acquired current discrete value to obtain the actual current sample value sequence curve; Storing the voltage sample value sequence curve and the current sample value sequence curve.

3. The load sensing method of claim 1, wherein, The calculation of voltage effective value, current effective value, active power and power factor according to the voltage and current sample value sequence curves, and the drawing of the corresponding change curves, specifically comprises: According to the real-time voltage and current sample value sequence curves, the root mean square value method is used to calculate the voltage effective value and current effective value of each sampling point, and the continuous voltage effective value change curve and current effective value change curve are obtained; According to the real-time voltage and current sample value sequence curves, the instantaneous power is subjected to periodic average operation to obtain the active power value of each sampling point, and the active power change curve is formed; The power factor corresponding to each sampling point is calculated through the active power, and the power factor change curve is formed, and the mathematical expression of the power factor corresponding to each sampling point is: （1） In equation (1), is the power factor, is the power, is the voltage, is the current.

4. The load sensing method of claim 1, wherein, The identification of transient starting characteristics and transient starting characteristics according to the changes of voltage effective value, current effective value, active power and power factor, specifically comprises: When the current effective value is greater than or equal to the incremental value, it is determined that the load is connected; the load connection time is The corresponding current effective value is recorded as The active power is recorded as The voltage effective value is recorded as The power factor is recorded as ; During the transient starting process of the micro-motor load, the impulse climb satisfies the following characteristics: A. During the starting of the micro-motor load, the power impulse climbs twice; B. The absolute value of the first power impulse climb in the starting of the micro-motor load is greater than the absolute value of the second power impulse; After the transient starting impulse climb of the micro-motor load, the micro-motor load enters the transient stable starting process, and whether the characteristics are satisfied is judged; After the starting is completed, the motor enters the normal running state.

5. The load sensing method of claim 4, wherein, The climb value of the impulse during the transient starting process of the micro-motor load satisfies the following mathematical expression: （2） In equation (2), For a given time limit value, the active power rises from The impulse rises to The time period is to .

6. The load sensing method of claim 4, wherein, After the transient starting impulse climb of the micro-motor load, the micro-motor load enters the transient stable starting process, and whether the characteristics are satisfied is judged, specifically comprising: The time period when the micro motor load enters the transient stable starting process is to The active power, the current effective value, the voltage effective value, and the power factor satisfy the following mathematical expressions: （3） In equation (3), is a micro-motor longest start-up time threshold, is a micro-motor shortest start-up time threshold.

7. A load sensing method for a microelectromechanical device according to claim 5 or 6, wherein The threshold value of the micro-motor load is adjusted online to meet the needs of different working conditions.

8. A microelectromechanical load sensing system, characterized by The method comprises the following steps: A signal acquisition module for real-time acquisition of voltage and current signals of the load; A signal processing module comprising a signal preprocessing unit and a signal processing unit; The signal processing module receives data information of the signal acquisition module and performs data processing; The signal preprocessing unit is used for removing the bias value of the voltage and current signals to obtain the actual voltage and current sampling value sequence curve; the signal processing unit receives the data information of the signal preprocessing unit and performs data processing to obtain the voltage effective value, current effective value, active power and power factor and their change curves; The feature recognition module receives the data information of the signal processing module and performs feature recognition to determine whether it is a micromotor load; The communication module is used for transmitting the real-time change curve, recognition result and micromotor load label symbol to a remote server; The storage module is used for storing the real-time and historical change curves, recognition results and micromotor load label symbols.

9. A computer readable storage medium having stored therein a computer program, characterized in that, The computer program, when executed by a processor, is used to implement the micromotor load sensing method according to any one of claims 1-7.

10. An electronic device comprising: one or more processors; a memory for storing one or more computer programs; wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to perform the micromotor load sensing method according to any one of claims 1-7.

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