A micro-motor load sensing method, system, medium and electronic device

Abstract

The present application relates to the technical field of micro motor load sensing, and discloses a micro motor load sensing method, system, medium and electronic equipment. A micro motor load sensing method comprises collecting the voltage and current of an access load in real time, removing the bias to obtain the actual voltage and current sample value sequence curve; calculating the voltage effective value, current effective value, active power and power factor according to the voltage and current sample value sequence curve, and drawing the corresponding change curve; identifying the transient starting characteristic and transient starting characteristic according to the change of the voltage effective value, current effective value, active power and power factor; determining the micro motor type of the load according to the identification result, and placing the micro motor load label symbol. The present application improves the identification efficiency and accuracy of the micro motor load.

Description

Technical Field

[0001] This invention relates to the field of micro motor load sensing technology, specifically to a micro motor load sensing method, system, medium, and electronic device. Background Technology

[0002] The electrical loads connected to IoT smart circuit breakers have diverse characteristics, and accurate load sensing can rapidly improve the system's control and protection decision-making strategies. Currently, there are mature identification methods for electric charging vehicles and malicious loads, but there is a lack of necessary sensing methods for identifying micro-motor loads. There is an urgent need for the sensing and accurate identification of the characteristics of micro-motor loads to improve the decision-making performance of miniature circuit breakers.

[0003] Therefore, this invention proposes a micro-motor load sensing method, system, medium, and electronic device. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this application provides a micro-motor load sensing method, system, medium, and electronic device.

[0006] (II) Technical Solution

[0007] To address the above problems, this application provides the following technical solution:

[0008] A micro motor load sensing method, comprising:

[0009] The voltage and current of the connected load are collected in real time, and the actual voltage and current sample value sequence curve is obtained after removing the bias.

[0010] Calculate the effective value of voltage, effective value of current, active power and power factor based on the voltage and current sampling value sequence curves, and plot the corresponding change curves.

[0011] Based on the changes in the effective values ​​of voltage, current, active power, and power factor, transient and transient start-up characteristics are identified respectively.

[0012] The type of micro motor in the load is determined based on the identification results, and a micro motor load label symbol is set.

[0013] Preferably, the real-time acquisition of the voltage and current of the connected load, and the removal of the bias to obtain the actual voltage and current sample value sequence curve, specifically includes:

[0014] Subtract the bias value 3010 set in the acquisition circuit from the real-time collected discrete voltage values ​​to obtain the actual voltage sample value sequence curve;

[0015] Subtract the bias value of 2000 set in the acquisition circuit from the discrete current value collected in real time to obtain the actual current sampling value sequence curve;

[0016] Store the voltage sample value sequence curve and the current sample value sequence curve.

[0017] Preferably, the step of calculating the effective voltage value, effective current value, active power, and power factor based on the voltage and current sampling value sequence curves, and plotting the corresponding change curves, specifically includes:

[0018] Based on the real-time voltage and current sampling value sequence curves, the root mean square value method is used to calculate the effective voltage and effective current values ​​at each sampling point, and continuous effective voltage and effective current value variation curves are obtained.

[0019] Based on the real-time voltage and current sampling value sequence curves, the instantaneous power is periodically averaged to obtain the active power value at each sampling point, and an active power change curve is formed.

[0020] The power factor corresponding to each sampling point is obtained by calculating the active power, and a power factor variation curve is generated. The mathematical expression for the power factor corresponding to each sampling point is as follows:

[0021] (1)

[0022] In formula (1), For power factor, For power, For voltage, It represents electric current.

[0023] Preferably, the step of identifying transient start-up characteristics and transient start-up characteristics based on changes in the effective voltage value, effective current value, active power, and power factor specifically includes:

[0024] When the detected effective current value is greater than or equal to the incremental set value, it is determined that a load is connected; the load connection time is... The corresponding effective value of the current is denoted as Active power is denoted as The effective value of voltage is denoted as Power factor is denoted as ;

[0025] During the transient start-up of a micro-motor load, the impulse ramp-up satisfies the following characteristics:

[0026] A. During the starting of a micro-motor under a negative load, the power impulse rises twice.

[0027] B. The absolute value of the first power surge during the startup of a micro-motor load is greater than the absolute value of the second power surge.

[0028] After the transient start-up impulse of the micro-motor load increases, it enters the temporary stabilization start-up process of the micro-motor load and determines whether the characteristics are met.

[0029] After startup, the motor enters normal operating mode.

[0030] Preferably, during the transient start-up process of the micro-motor load, the surge value of the impulse satisfies the following mathematical expression:

[0031] (2)

[0032] In formula (2), Given a time limit, the active power from The momentum climbed to The time period is arrive .

[0033] Preferably, after the transient start-up impulse of the micro-motor load increases, it enters the micro-motor load temporary stabilization start-up process, and determines whether the characteristics are met, specifically including:

[0034] The period during which the micro-motor load enters the quiescent start-up process is: arrive The active power, RMS current, RMS voltage, and power factor satisfy the following mathematical expressions:

[0035] (3)

[0036] In formula (3), This represents the maximum start-up time threshold for the micro motor. This is the threshold for the shortest start-up time of a micro motor.

[0037] Preferably, the threshold of the microelectromechanical load can be set and adjusted online to meet the needs of different operating conditions.

[0038] A micro motor load sensing system comprises:

[0039] The signal acquisition module is used to acquire the voltage and current signals of the load in real time.

[0040] The signal processing module includes a signal preprocessing unit and a signal processing unit; the signal processing module receives data information from the signal acquisition module and performs data processing; the signal preprocessing unit is used to remove the bias values ​​of voltage and current signals to obtain the actual voltage and current sampled value sequence curves; the signal processing unit receives data information from the signal preprocessing unit and performs data processing to obtain the effective voltage value, effective current value, active power, and power factor and their variation curves.

[0041] The feature recognition module receives data information from the signal processing module and performs feature recognition to determine whether it is a micro motor load.

[0042] The communication module is used to transmit real-time change curves, identification results, and micro-motor load tag symbols to a remote server;

[0043] The storage module is used to store real-time and historical change curves, identification results, and micro-motor load label symbols.

[0044] A computer-readable storage medium storing a computer program, which, when executed by a processor, is used to implement the above-described micro-motor load sensing method.

[0045] An electronic device, comprising:

[0046] One or more processors;

[0047] Memory, used to store one or more computer programs;

[0048] 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.

[0049] (III) Beneficial Effects

[0050] Compared with the prior art, this application provides a micro-motor load sensing method, system, medium, and electronic device, which have the following beneficial effects:

[0051] 1. This method captures the unique transient characteristics of two power surges during the startup process of a micro motor, and combines multi-parameter collaborative judgment of voltage, current, and power factors to achieve online and accurate sensing of the micro motor load;

[0052] 2. This method can accurately determine the type of micro motor load, enabling the circuit breaker to be matched with a dedicated control and protection strategy.

[0053] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0054] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0055] Figure 1 This is a flowchart illustrating the application process.

[0056] Figure 2 This is a schematic diagram of the original sampled voltage and current values ​​during the air conditioner startup process of this application;

[0057] Figure 3 This is a schematic diagram of the real-time curves of the original sampled voltage and current values ​​after deducting the offset during the air conditioner startup process of this application.

[0058] Figure 4 This is a schematic diagram of the effective value curves of voltage and current during the start-up process of the air conditioner in this application;

[0059] Figure 5 This is a schematic diagram of the active power change curve during the air conditioner startup process of this application;

[0060] Figure 6 This is a schematic diagram of the power factor curve during the air conditioner startup process of this application;

[0061] Figure 7 This is a schematic diagram of the washing machine startup waveform of this application;

[0062] Figure 8 This is a schematic diagram of the start-up waveform of the range hood in this application;

[0063] Figure 9 This is a schematic diagram of the refrigerator startup waveform in this application. Detailed Implementation

[0064] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0065] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0066] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0068] This application provides a new technical solution: a micro-motor load sensing method, comprising:

[0069] The voltage and current of the connected load are collected in real time, and the actual voltage and current sample value sequence curve is obtained after removing the bias.

[0070] Calculate the effective value of voltage, effective value of current, active power and power factor based on the voltage and current sampling value sequence curves, and plot the corresponding change curves.

[0071] Based on the changes in the effective values ​​of voltage, current, active power, and power factor, transient and transient start-up characteristics are identified respectively.

[0072] The type of micro motor in the load is determined based on the identification results, and a micro motor load label symbol is set.

[0073] In this invention, the real-time acquisition of the voltage and current of the connected load, and the removal of bias to obtain the actual voltage and current sample value sequence curve, specifically includes:

[0074] Subtract the bias value 3010 set in the acquisition circuit from the real-time collected discrete voltage values ​​to obtain the actual voltage sample value sequence curve;

[0075] Subtract the bias value of 2000 set in the acquisition circuit from the discrete current value collected in real time to obtain the actual current sampling value sequence curve;

[0076] Store the voltage sample value sequence curve and the current sample value sequence curve.

[0077] In this invention, the step of calculating the effective voltage value, effective current value, active power, and power factor based on the voltage and current sampling value sequence curves, and plotting the corresponding change curves, specifically includes:

[0078] Based on the real-time voltage and current sampling value sequence curves, the root mean square value method is used to calculate the effective voltage and effective current values ​​at each sampling point, and continuous effective voltage and effective current value variation curves are obtained.

[0079] Based on the real-time voltage and current sampling value sequence curves, the instantaneous power is periodically averaged to obtain the active power value at each sampling point, and an active power change curve is formed.

[0080] The power factor corresponding to each sampling point is obtained by calculating the active power, and a power factor variation curve is generated. The mathematical expression for the power factor corresponding to each sampling point is as follows:

[0081] (1)

[0082] In formula (1), For power factor, For power, For voltage, It represents electric current.

[0083] In this invention, the identification of transient start-up characteristics and transient start-up characteristics based on changes in effective voltage, effective current, active power, and power factor specifically includes:

[0084] When the detected effective current value is greater than or equal to the incremental set value, it is determined that a load is connected; the load connection time is... The corresponding effective value of the current is denoted as Active power is denoted as The effective value of voltage is denoted as Power factor is denoted as ;

[0085] During the transient start-up of a micro-motor load, the impulse ramp-up satisfies the following characteristics:

[0086] A. During the starting of a micro-motor under a negative load, the power impulse rises twice.

[0087] B. The absolute value of the first power surge during the startup of a micro-motor load is greater than the absolute value of the second power surge.

[0088] After the transient start-up impulse of the micro-motor load increases, it enters the temporary stabilization start-up process of the micro-motor load and determines whether the characteristics are met.

[0089] After startup, the motor enters normal operating mode.

[0090] In this embodiment, the mathematical expression for determining load access is:

[0091] (4)

[0092] In formula (4), This is the increment of the effective value of the current. Set a value for the increment of the effective value of the current. The effective value of the current is calculated from the current sample value at the nth time. The effective value of the current is calculated from the (n+1)th current sample value;

[0093] In this invention, during the transient start-up process of the micro-motor load, the surge value of the impulse satisfies the following mathematical expression:

[0094] (2)

[0095] In formula (2), Given a time limit, the active power from The momentum climbed to The time period is arrive .

[0096] In this embodiment, the air conditioner startup process is taken as an example, such as... Figures 2-6 As shown, with the connection of the load, the active power increases from... The mathematical expression for the slope of the rapid increase in active power is:

[0097] (5)

[0098] During the initial transient start-up of a micro-motor, the first impulse power surge has an increment slope of more than 80°, instantly rising to... After that, the slope of the active power increment The occurrence of a negative value indicates that the initial impulse power during the micro-motor's startup transient has reached the baseline value. ,correspond This time series is denoted as The effective value of the current is denoted as ;

[0099] The slope of the active power increment After the increment becomes negative, the slope of the increment quickly reaches the active power. Positive values ​​appear again At that moment, the micro-motor enters the second impulse power ramp-up during the startup transient, and the slope of the active power increment rapidly rises to the maximum power during the startup process. ,correspond The time series is denoted as _____. The effective value of the current also reached its maximum value. Subsequently Negative values ​​indicate power The value decreases very little, the effective current value decreases very little, reaching the quasi-stable stage of startup; corresponding to the change in the time series, the power factor also changes from... The minimum value at time rises to Moment As the secondary impulse of the micro-motor increases, the power factor also rapidly rises to its maximum value. Then it entered a period of stabilization.

[0100] In this invention, after the transient start-up impulse of the micro-motor load increases, it enters a temporary stable start-up process and determines whether the characteristics are met, specifically including:

[0101] The period during which the micro-motor load enters the quiescent start-up process is: arrive The active power, RMS current, RMS voltage, and power factor satisfy the following mathematical expressions:

[0102] (3)

[0103] In formula (3), This represents the maximum start-up time threshold for the micro motor. This is the threshold for the shortest start-up time of a micro motor.

[0104] In the embodiment, the arrival back, arrive The time period is the start-up completion phase, and the start-up power is... Descending to The starting current is from Descending to The voltage is from rebounded to With the power factor remaining almost constant, the startup is complete, and the motor enters normal operating condition.

[0105] In this invention, the threshold of the microelectromechanical load can be set and adjusted online to meet the needs of different operating conditions.

[0106] In the embodiment, the startup process of the washing machine, range hood, and refrigerator is as follows: Figures 7-9 As shown.

[0107] A micro motor load sensing system comprises:

[0108] The signal acquisition module is used to acquire the voltage and current signals of the load in real time.

[0109] The signal processing module includes a signal preprocessing unit and a signal processing unit; the signal processing module receives data information from the signal acquisition module and performs data processing; the signal preprocessing unit is used to remove the bias values ​​of voltage and current signals to obtain the actual voltage and current sampled value sequence curves; the signal processing unit receives data information from the signal preprocessing unit and performs data processing to obtain the effective voltage value, effective current value, active power, and power factor and their variation curves.

[0110] The feature recognition module receives data information from the signal processing module and performs feature recognition to determine whether it is a micro motor load.

[0111] The communication module is used to transmit real-time change curves, identification results, and micro-motor load tag symbols to a remote server;

[0112] The storage module is used to store real-time and historical change curves, identification results, and micro-motor load label symbols.

[0113] A computer-readable storage medium storing a computer program, which, when executed by a processor, is used to implement the above-described micro-motor load sensing method.

[0114] An electronic device, comprising:

[0115] One or more processors;

[0116] Memory, used to store one or more computer programs;

[0117] 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.

[0118] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0119] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for sensing the load of a micro motor, characterized in that, include: The voltage and current of the connected load are collected in real time, and the actual voltage and current sample value sequence curve is obtained after removing the bias. Calculate the effective value of voltage, effective value of current, active power and power factor based on the voltage and current sampling value sequence curves, and plot the corresponding change curves. Based on changes in RMS voltage, RMS current, active power, and power factor, transient and transient start-up characteristics are identified, specifically including: When the detected effective current value is greater than or equal to the incremental set value, it is determined that a load is connected; the load connection time is... The corresponding effective value of the current is denoted as Active power is denoted as The effective value of voltage is denoted as Power factor is denoted as ; During the transient start-up of a micro-motor load, the impulse ramp-up satisfies the following characteristics: During the starting process of a micro-motor under a load, the power impulse experiences two surges. In the startup of a micro-motor load, the absolute value of the first power surge is greater than the absolute value of the second power surge. After the transient start-up impulse of the micro-motor load increases, it enters the temporary stabilization start-up process of the micro-motor load and determines whether the characteristics are met; after the start-up is completed, the motor enters the normal operation state. The type of micro motor in the load is determined based on the identification results, and a micro motor load label symbol is set.

2. The micro-motor load sensing method according to claim 1, characterized in that, The real-time acquisition of the voltage and current of the connected load, and the removal of bias to obtain the actual voltage and current sample value sequence curve, specifically includes: Subtract the bias value 3010 set in the acquisition circuit from the real-time collected discrete voltage values ​​to obtain the actual voltage sample value sequence curve; Subtract the bias value of 2000 set in the acquisition circuit from the discrete current value collected in real time to obtain the actual current sampling value sequence curve; Store the sequence curves of voltage and current sample values.

3. The micro-motor load sensing method according to claim 1, characterized in that, The calculation of the effective voltage value, effective current value, active power, and power factor based on the voltage and current sampling value sequence curves, and the plotting of the corresponding change curves, specifically includes: Based on the real-time voltage and current sampling value sequence curves, the root mean square value method is used to calculate the effective voltage and effective current values ​​at each sampling point, and continuous effective voltage and effective current value variation curves are obtained. Based on the real-time voltage and current sampling value sequence curves, the instantaneous power is periodically averaged to obtain the active power value at each sampling point, and an active power change curve is formed. The power factor for each sampling point is obtained through active power calculation, and a power factor variation curve is generated. The mathematical expression for the power factor for each sampling point is as follows: （1） In formula (1), For power factor, For power, For voltage, It represents electric current.

4. The micro-motor load sensing method according to claim 1, characterized in that, During the transient start-up process of a micro-motor load, the surge value of the impulse satisfies the following mathematical expression: （2） In formula (2), Given a time limit, the active power from The momentum climbed to The time period is arrive .

5. The micro-motor load sensing method according to claim 1, characterized in that, After the transient start-up impulse of the micro-motor load increases, it enters the micro-motor load temporary stabilization start-up process, and determines whether the characteristics are met, specifically including: The period during which the micro-motor load enters the quiescent start-up process is: arrive The active power, RMS current, RMS voltage, and power factor satisfy the following mathematical expressions: （3） In formula (3), This represents the maximum start-up time threshold for the micro motor. This is the threshold for the shortest start-up time of a micro motor.

6. A micro-motor load sensing method according to claim 4 or 5, characterized in that, The threshold value of the micro motor load can be set and adjusted online to meet the needs of different working conditions.

7. A micro-motor load sensing system, characterized in that, include: The signal acquisition module is used to acquire the voltage and current signals of the load in real time. The signal processing module includes a signal preprocessing unit and a signal processing unit; The signal processing module receives data information from the signal acquisition module and processes the data; The signal preprocessing unit is used to remove the bias values ​​of voltage and current signals to obtain the actual voltage and current sampled value sequence curves; the signal processing unit receives the data information from the signal preprocessing unit and performs data processing to obtain the effective voltage value, effective current value, active power and power factor and their variation curves; The feature recognition module receives data information from the signal processing module and performs feature recognition to determine whether it is a micro motor load; the micro motor load recognition includes transient start feature recognition and transient start feature recognition; During the transient start-up of a micro-motor load, the impulse ramp-up satisfies the following characteristics: During the starting process of a micro-motor under a load, the power impulse experiences two surges. In the startup of a micro-motor load, the absolute value of the first power surge is greater than the absolute value of the second power surge. After the transient start-up impulse of the micro-motor load increases, it enters the temporary stable start-up process of the micro-motor load and determines whether the micro-motor load characteristics are met. The communication module is used to transmit real-time change curves, identification results, and micro-motor load tag symbols to a remote server; The storage module is used to store real-time and historical change curves, identification results, and micro-motor load label symbols.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it is used to implement the micro-motor load sensing method according to any one of claims 1-6.

9. An electronic device, comprising: One or more processors; Memory, used to store one or more computer programs; 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 according to any one of claims 1-6.

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