Microwave oven startup characteristic identification method and system, computer equipment, and storage medium

Abstract

The present invention relates to a microwave oven startup characteristic identification method and system, computer equipment, and storage medium, comprising the following steps: collecting the instantaneous values ​​of voltage and current at set moments on a distribution bus; calculating the basic characteristic vectors at each set moment respectively; calculating the steady-state power increment and harmonic increment within a set time interval, including the average increment of active power, the average increment of reactive power, the average increment of third voltage harmonics, and the average increment of third current harmonics; comparing the steady-state power increment and harmonic increment within the set time interval with a multidimensional characteristic criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven startup characteristic, wherein the multidimensional characteristic criterion includes the set average increment of active power, the average increment of reactive power, the average increment of third voltage harmonics, and the average increment of third current harmonics. The present invention improves the accuracy of microwave oven startup characteristic identification.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical load characteristic identification, and in particular to a microwave oven startup characteristic identification method and system, computer equipment, and storage medium. Background Art

[0002] In recent years, with the continuous development of advanced measurement systems (AMI)-related technologies in the power sector, various new types of power big data have been continuously introduced into the power system. As a high-frequency data collection and analysis technology used in AMI systems, non-intrusive technology has demonstrated its great advantages over traditional power information collection technology with its convenient installation, flexible deployment, non-intrusive operation and analysis. However, there is still much room for improvement in the extraction methods of the characteristics of certain types of electrical appliances or hybrid electrical appliances in complex scenarios.

[0003] Conventional load feature extraction methods mainly rely on a single microscopic characteristic criterion, the typical criterion being active power. However, due to the high probability of repetition of active power values ​​of various loads in real environments, the accuracy and stability of traditional load feature extraction methods cannot meet the requirements of subsequent load feature library modeling and identification when faced with the scenario of extracting multiple electrical appliance characteristics.

[0004] Since non-intrusive power load monitoring technology mostly relies on software algorithms, including feature extraction, template library establishment, and feature identification, a set of identification methods for the characteristics of different electrical appliances is currently needed to ensure the effectiveness of the subsequent feature template library and the accuracy of identification. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a method and system for identifying the startup characteristics of a microwave oven, a computer device, and a readable storage medium, which can significantly improve the accuracy of identifying the startup characteristics of a microwave oven.

[0006] The present invention solves the practical problem by adopting the following technical solutions:

[0007] A method for identifying microwave oven startup characteristics comprises the following steps:

[0008] Collect the instantaneous values ​​of voltage and current on the power distribution bus at a set time;

[0009] According to the instantaneous values ​​of the voltage and current at the set time, the basic characteristic vector at the set time is calculated, including: the effective value of voltage, the effective value of current, active power, reactive power, the third voltage harmonic component and the third current harmonic component;

[0010] Calculate the steady-state power increment and harmonic increment within the set time interval according to the basic eigenvectors at the set moments, including the average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics;

[0011] The steady-state power increment and harmonic increment within the set time interval are compared with a multidimensional feature criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven start-up characteristics. If so, the microwave oven is started, wherein the multidimensional feature criterion includes a set average active power increment, an average reactive power increment, an average third voltage harmonic increment, and an average third current harmonic increment.

[0012] Furthermore, the specific method for collecting the instantaneous values ​​of voltage and current on the power distribution bus at a set time is:

[0013] By installing a high-frequency acquisition terminal or a non-intrusive load identification terminal on the distribution bus that needs to be monitored, the instantaneous values ​​of voltage and current at the set time are collected.

[0014] Further, according to the instantaneous values ​​of the voltage and current at the set time, calculating the basic characteristic vector at the set time includes:

[0015] Through fast Fourier transform, the voltage effective value U(t) and current effective value I(t) at the set time are obtained, as shown in equation (1) and equation (2):

[0016] U(t)=U1[cos(ωt+δ1)+...+α k cos(kωt+δ k )+...] Formula (1)

[0017] I(t)=I1[cos(ωt+θ1)+...+β k cos(kωt+θ k )+...] Formula (2)

[0018] Wherein, U(t) in formula (1) represents the voltage value of the electrical equipment when it is in steady state at time t, U1 is the amplitude of the voltage fundamental component of the electrical equipment when it is in steady state, δ k is the phase angle, α k It indicates the ratio of the amplitude of the kth harmonic of the steady-state voltage of the electrical equipment to the amplitude of the fundamental component of the voltage in the steady state;

[0019] In formula (2), I(t) represents the current value of the electrical equipment when it is in steady state at time t, I1 is the amplitude of the fundamental component of the current of the electrical equipment when it is in steady state, and θ k is the phase angle, β k It indicates the ratio of the amplitude of the kth harmonic of the steady-state current of the electrical equipment to the amplitude of the fundamental component of the current in the steady state;

[0020] From equations (1) and (2), the calculation methods of active power and reactive power of electrical equipment at time t are shown in equations (3) and (4) respectively:

[0021] P(t)=U(t)×I(t)×cosθ(t) Formula (3)

[0022] Q(t)=U(t)×I(t)×sinθ(t) Formula (4)

[0023] In formula (3), cosθ(t) represents the cosine value of the phase difference θ between voltage and current at time t;

[0024] In formula (4), sinθ(t) represents the sine value of the phase difference θ between voltage and current at time t;

[0025] At the same time, according to the definition of fast Fourier transform, the third voltage harmonic component and the third current harmonic component are obtained as shown in equation (5) and equation (6):

[0026] U3(t)=U1[α3cos(kωt+δ3)] Formula (5)

[0027] I3(t)=I1[β3cos(kωt+θ3)] Formula (6)

[0028] In formula (5), U3 represents the amplitude of the third harmonic voltage of the electrical equipment at time t, U1 represents the amplitude of the voltage fundamental component of the electrical equipment in steady state, δ3 represents the phase angle between the fundamental voltage and the third harmonic voltage, and α3 represents the ratio of the amplitude of the third harmonic voltage of the electrical equipment in steady state to its fundamental amplitude;

[0029] In formula (6), I3 represents the amplitude of the third harmonic current of the electrical equipment at time t, I1 represents the amplitude of the fundamental component of the current of the electrical equipment in steady state, θ3 represents the phase angle between the fundamental current and the third harmonic current, and β3 represents the ratio of the amplitude of the third harmonic current of the electrical equipment in steady state to its fundamental amplitude;

[0030] Furthermore, the specific formula for calculating the steady-state power increment and harmonic wave increment within the set time interval based on the basic eigenvectors at the set time moments is:

[0031]

[0032]

[0033]

[0034]

[0035] Wherein, N represents the number of set moments in the set time interval; t represents the set moment; i represents the count of the starting moment;

[0036] Wherein, formula (7) is the calculation method of average increment of active power; formula (8) is the calculation method of average increment of reactive power; formula (9) is the calculation method of average increment of third voltage harmonic; formula (10) is the calculation method of average increment of third current harmonic.

[0037] Further, comparing the steady-state power increment and the harmonic wave increment within the set time interval with the multi-dimensional characteristic criterion to determine whether the steady-state power increment and the harmonic wave increment within the set time interval meet the microwave oven startup characteristics includes:

[0038] The active power average increment is compared with the set active power average increment, and the judgment condition is:

[0039] ΔP(t)≥first set value Formula (11)

[0040] Wherein ΔP(t) is the average increment of active power, and the first setting value is the set average increment of active power;

[0041] If the condition of formula (11) is not met, the instantaneous values ​​of voltage and current at the set time on the distribution bus are continuously collected;

[0042] If the condition of formula (11) is met, the average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics are compared with the set average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics, respectively. The judgment condition is:

[0043] ΔQ(t)≥second set value; Formula (12)

[0044] ΔI3(t)≥the third set value; Formula (13)

[0045] ΔU3(t)≥the fourth set value; Formula (14)

[0046] Among them, ΔQ(t), ΔI3(t), ΔU3(t) are respectively the average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic; the second set value, the third set value, and the fourth set value are respectively the set average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic;

[0047] If equations (12)-(14) are satisfied, the microwave oven is started.

[0048] Furthermore, the first setting value ranges from 1000W to 1500W, the second setting value ranges from 250Var to 400Var, the third setting value ranges from 1.5A to 2A, and the fourth setting value ranges from 2V to 2.5V.

[0049] Furthermore, the method further comprises the following steps:

[0050] When it is determined that the microwave oven is started, the steady-state power increment and harmonic wave increment within the set time interval are defined as microwave oven characteristic tags and stored.

[0051] A microwave oven startup characteristic identification system, comprising:

[0052] The electrical parameter information acquisition module is used to collect the instantaneous values ​​of voltage and current on the power distribution bus at a set time;

[0053] A basic characteristic quantity calculation module of the startup characteristic, used to calculate the basic characteristic vector at the set time according to the instantaneous values ​​of the voltage and current at the set time, including: voltage effective value, current effective value, active power, reactive power, third voltage harmonic component and third current harmonic component;

[0054] A steady-state power increment and harmonic increment calculation module, used to calculate the steady-state power increment and harmonic increment within a set time interval according to the basic characteristic vectors at the set moments, including the average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonics and the average increment of the third current harmonics;

[0055] The microwave oven startup characteristic judgment module is used to compare the steady-state power increment and harmonic increment within the set time interval with the multidimensional characteristic criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven startup characteristics. If so, the microwave oven is started, wherein the multidimensional characteristic criterion includes the set average active power increment, average reactive power increment, third voltage harmonic average increment and third current harmonic average increment.

[0056] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of a method for identifying the startup characteristics of a microwave oven when executing the computer program.

[0057] A computer storage medium stores a computer program, which implements the steps of a method for identifying the startup characteristics of a microwave oven when the computer program is executed by a processor.

[0058] Advantages and beneficial effects of the present invention:

[0059] The present invention extracts and identifies the microwave oven startup characteristics by high-frequency collection and analysis of microwave oven startup characteristics, and uses multiple features as comprehensive criteria, by calculating the steady-state power increment and harmonic increment within a set time interval, including the average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic; the steady-state power increment and harmonic increment within the set time interval are compared with the multidimensional feature criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven startup characteristics, and if they meet, the microwave oven is started, wherein the multidimensional feature criterion includes the set average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic. Since the method is completely aimed at the load operation characteristics of microwave ovens, the accuracy of microwave oven startup characteristic extraction is significantly improved. Based on this idea, it can be extended to feature extraction methods of other loads in the future, comprehensively improving the overall identification accuracy of various loads, and providing key method support for the further promotion and application of subsequent non-invasive power load monitoring and decomposition technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 is a processing flow chart of a specific embodiment of the present invention;

[0061] Figure 2 is a microwave oven active power curve diagram of the present invention;

[0062] Figure 3 is a reactive power curve diagram of a microwave oven of the present invention;

[0063] Figure 4 It is a third harmonic voltage curve diagram of the microwave oven of the present invention;

[0064] Figure 5 It is the third harmonic current curve diagram of the microwave oven of the present invention. DETAILED DESCRIPTION

[0065] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0066] This embodiment provides a method for identifying the startup characteristics of a microwave oven. Figure 1 As shown, the following steps are included:

[0067] Collect the instantaneous values ​​of voltage and current on the power distribution bus at a set time;

[0068] The set time can be to collect the instantaneous values ​​of voltage and current at a certain frequency, such as sampling 256 points for each power frequency (20ms) cycle according to the sampling frequency, that is, the sampling frequency is 12.8Khz, the sampling interval is 0.078125ms, and every 0.078125ms is a set time. This embodiment adopts high-frequency collection mode for collection, and the sampling frequency of high-frequency collection is greater than or equal to 12.8khz.

[0069] The specific method for collecting the instantaneous values ​​of voltage and current on the power distribution bus at a set time is:

[0070] By installing a high-frequency acquisition terminal, such as a fault recorder or a non-intrusive load identification terminal, on the distribution bus that needs to be monitored, the instantaneous values ​​of voltage U and current I at each set moment are collected to meet the subsequent fast Fourier transform requirements.

[0071] According to the instantaneous values ​​of the voltage and current at each set moment, respectively calculate the basic characteristic vectors at each set moment, including: voltage effective value, current effective value, active power, reactive power, third voltage harmonic component and third current harmonic component;

[0072] Through fast Fourier transform, the effective value of voltage U(t) and the effective value of current I(t) at each moment can be obtained, as shown in equation (1) and equation (2):

[0073] U(t)=U1[cos(ωt+δ1)+...+α k cos(kωt+δ k )+...] Formula (1)

[0074] I(t)=I1[cos(ωt+θ1)+...+β k cos(kωt+θ k )+...] Formula (2)

[0075] Wherein, U(t) in formula (1) represents the voltage value of the electrical equipment when it is in steady state at time t, U1 is the amplitude of the voltage fundamental component of the electrical equipment when it is in steady state, δ k is the phase angle, α k It indicates the ratio of the amplitude of the kth harmonic of the steady-state voltage of the electrical equipment to its fundamental amplitude;

[0076] In formula (2), I(t) represents the current value of the electrical equipment when it is in steady state at time t, I1 is the amplitude of the fundamental component of the current of the electrical equipment when it is in steady state, and θ k is the phase angle, β k It indicates the ratio of the amplitude of the kth harmonic to the amplitude of its fundamental wave in the steady-state current of the electrical equipment;

[0077] From equations (1) and (2), the calculation methods of active power and reactive power of electrical equipment at time t are shown in equations (3) and (4) respectively:

[0078] P(t)=U(t)×I(t)×cosθ(t) Formula (3)

[0079] Q(t)=U(t)×I(t)×sinθ(t) Formula (4)

[0080] In formula (3), cosθ(t) represents the cosine value of the phase difference θ between voltage and current at time t;

[0081] In formula (4), sinθ(t) represents the sine value of the phase difference θ between voltage and current at time t;

[0082] At the same time, according to the definition of fast Fourier transform, the third voltage harmonic component and the third current harmonic component can be obtained as shown in equation (5) and equation (6):

[0083] U3(t)=U1[α3cos(kωt+δ3)] Formula (5)

[0084] I3(t)=I1[β3cos(kωt+θ3)] Formula (6)

[0085] In formula (5), U3 represents the amplitude of the third harmonic voltage of the electrical equipment at time t, U1 represents the amplitude of the voltage fundamental component of the electrical equipment in steady state, δ3 represents the phase angle between the fundamental voltage and the third harmonic voltage, and α3 represents the ratio of the amplitude of the third harmonic voltage of the electrical equipment in steady state to its fundamental amplitude;

[0086] In formula (6), I3 represents the amplitude of the third harmonic current of the electrical equipment at time t, I1 represents the amplitude of the fundamental component of the current of the electrical equipment in steady state, θ3 represents the phase angle between the fundamental current and the third harmonic current, and β3 represents the ratio of the amplitude of the third harmonic current of the electrical equipment in steady state to its fundamental amplitude;

[0087] Calculate the steady-state power increment and harmonic increment within the set time interval according to the basic eigenvectors at the multiple set moments, including the average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics;

[0088] The steady-state power increment and the harmonic wave increment are calculated by using the basic eigenvectors at the above-mentioned multiple set moments, and the steady-state power increment and the harmonic wave increment are calculated respectively within the set time interval in order to eliminate line disturbances;

[0089]

[0090]

[0091]

[0092]

[0093] Wherein, N represents the number of set moments in the set time interval; t represents the set moment; i represents the count of the starting moment;

[0094] In this embodiment, the steady-state power increment and the harmonic wave increment are continuously collected at 10 set time intervals, that is, N=10, and the steady-state power increment and the harmonic wave increment are calculated by the following formula:

[0095]

[0096]

[0097]

[0098]

[0099] Wherein, formula (7) is the calculation method of average increment of active power; formula (8) is the calculation method of average increment of reactive power; formula (9) is the calculation method of average increment of third voltage harmonic; formula (10) is the calculation method of average increment of third current harmonic;

[0100] The steady-state power increment and harmonic increment within the set time interval are compared with a multidimensional feature criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven start-up characteristics. If so, the microwave oven is started, wherein the multidimensional feature criterion includes a set average active power increment, an average reactive power increment, an average third voltage harmonic increment, and an average third current harmonic increment.

[0101] The active power average increment is compared with the set active power average increment. First, the active power average increment is used as the trigger condition of the microwave oven startup characteristic, and the judgment condition is:

[0102] ΔP(t)≥first set value Formula (11)

[0103] Wherein ΔP(t) is the average increment of active power, and the first setting value is the set average increment of active power;

[0104] If the condition of formula (11) is not met, the instantaneous values ​​of voltage and current at the set time on the distribution bus are continuously collected;

[0105] If the condition of formula (11) is satisfied, it indicates that there may be a new microwave oven startup characteristic, and the reactive power average increment, the third voltage harmonic average increment, and the third current harmonic average increment are compared with the set reactive power average increment, the third voltage harmonic average increment, and the third current harmonic average increment, respectively. The judgment condition is:

[0106] ΔQ(t)≥second set value; Formula (12)

[0107] ΔI3(t)≥the third set value; Formula (13)

[0108] ΔU3(t)≥the fourth set value; Formula (14)

[0109] Among them, ΔQ(t), ΔI3(t), ΔU3(t) are respectively the average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic; the second set value, the third set value, and the fourth set value are respectively the set average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic;

[0110] If equations (12)-(14) are satisfied, the microwave oven is started.

[0111] The first setting value ranges from 1000W to 1500W, the second setting value ranges from 250Var to 400Var, the third setting value ranges from 1.5A to 2A, and the fourth setting value ranges from 2V to 2.5V;

[0112] When it is determined that the microwave oven is started, the steady-state power increment and harmonic wave increment within the set time interval are defined as microwave oven characteristic tags and stored in an event list to provide a reference for the next start-up characteristic identification.

[0113] A microwave oven startup characteristic identification system, comprising:

[0114] The electrical parameter information acquisition module is used to collect the instantaneous values ​​of voltage and current on the power distribution bus at a set time;

[0115] A basic characteristic quantity calculation module of the startup characteristic, used to calculate the basic characteristic vector at the set time according to the instantaneous values ​​of the voltage and current at the set time, including: voltage effective value, current effective value, active power, reactive power, third voltage harmonic component and third current harmonic component;

[0116] A steady-state power increment and harmonic increment calculation module, used to calculate the steady-state power increment and harmonic increment within a set time interval according to the basic eigenvectors at the multiple set moments, including the average active power increment, the average reactive power increment, the average third voltage harmonic increment and the average third current harmonic increment;

[0117] The microwave oven startup characteristic judgment module is used to compare the steady-state power increment and harmonic increment within the set time interval with the multidimensional characteristic criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven startup characteristics. If so, the microwave oven is started, wherein the multidimensional characteristic criterion includes the set average active power increment, average reactive power increment, third voltage harmonic average increment and third current harmonic average increment.

[0118] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of a method for identifying the startup characteristics of a microwave oven when executing the computer program.

[0119] A computer storage medium stores a computer program, which implements the steps of a method for identifying the startup characteristics of a microwave oven when the computer program is executed by a processor.

[0120] The processing flow of the present invention is further described below through specific examples:

[0121] In the first step, the voltage and current information on the distribution bus are collected through the high-frequency acquisition terminal, and the active power, reactive power, third voltage harmonic, and third current harmonic parameters are calculated, and a second-level interval curve is formed, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0122] The second step is to calculate the average power increment value of the above phase judgment, and obtain

[0123] ΔP(t)=1198W Formula (15)

[0124] ΔQ(t)=355Var Formula (16)

[0125] ΔU3(t)=2.75V Formula (17)

[0126] ΔI3(t)=1.85A Formula (18)

[0127] The third step is to determine the start of a valid event. According to formula (11), we can get

[0128] ΔP(t)=1198W≥1000W Formula (19)

[0129] The event initiation conditions are met, the event is determined to be valid, and the fourth step is entered

[0130] The fourth step is to judge according to formula (12), formula (13) and formula (14):

[0131] ΔQ(t)=355Var≥250Var Formula (20)

[0132] ΔU3(t)=2.75V≥2V Formula (21)

[0133] ΔI3(t)=1.85A≥1.5A Formula (22)

[0134] At the same time, the conditions are met, so the electrical characteristics of this startup are determined to be microwave oven startup characteristics, and the fifth step is to define feature tags and store them in the event list to provide basic feature conditions for the subsequent establishment of a microwave oven feature template library and related identification.

[0135] Through the implementation of the present invention, the inventive concept is not limited to the microwave oven and other electrical appliances described in this case. By collecting different state characteristics (start characteristics, stop characteristics, state change characteristics) of different types of electrical appliances, the exclusive unique combination criteria can be analyzed, and the extraction strategy and method of the corresponding state feature vector of the corresponding electrical appliance can be given.

[0136] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0137] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0138] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0139] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

Claims

1. A method for identifying the startup characteristics of a microwave oven, characterized in that: The following steps are involved: Collect the instantaneous values ​​of voltage and current on the power distribution bus at a set time; According to the instantaneous values ​​of the voltage and current at the set time, the basic characteristic vector at the set time is calculated, including: the effective value of voltage, the effective value of current, active power, reactive power, the third voltage harmonic component and the third current harmonic component; Calculate the steady-state power increment and harmonic increment within the set time interval according to the basic eigenvectors at the set moments, including the average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics; Comparing the steady-state power increment and the harmonic wave increment within the set time interval with the multidimensional characteristic criterion to determine whether the steady-state power increment and the harmonic wave increment within the set time interval meet the microwave oven startup characteristics, and if so, the microwave oven is started, wherein the multidimensional characteristic criterion includes the set average active power increment, average reactive power increment, average third voltage harmonic increment, and average third current harmonic increment; According to the instantaneous values ​​of the voltage and current at the set time, calculating the basic characteristic vector at the set time includes: Through fast Fourier transform, the voltage effective value U(t) and current effective value I(t) at the set time are obtained, as shown in equation (1) and equation (2): U(t) = U1[cos(ωt + δ1)+…+α k cos(kωt + δ k )+…] Equation (1) I(t) = I1[cos(ωt + θ1) + … + β k cos(kωt + θ k ) + …] Equation (2) Wherein, U(t) in formula (1) represents the voltage value of the electrical equipment when it is in steady state at time t, U1 is the amplitude of the voltage fundamental component of the electrical equipment when it is in steady state, δ k is the phase angle, α k It indicates the ratio of the amplitude of the kth harmonic of the steady-state voltage of the electrical equipment to the amplitude of the fundamental component of the voltage in the steady state; In formula (2), I(t) represents the current value of the electrical equipment when it is in steady state at time t, I1 is the amplitude of the fundamental component of the current of the electrical equipment when it is in steady state, and θ k is the phase angle, β k It indicates the ratio of the amplitude of the kth harmonic of the steady-state current of the electrical equipment to the amplitude of the fundamental component of the current in the steady state; From equations (1) and (2), the calculation methods of active power and reactive power of electrical equipment at time t are shown in equations (3) and (4) respectively: P(t)=U(t)×I(t)×cosθ(t) Formula (3) Q(t)=U(t)×I(t)×sinθ(t) Formula (4) In formula (3), cosθ(t) represents the cosine value of the phase difference θ between voltage and current at time t; In formula (4), sinθ(t) represents the sine value of the phase difference θ between voltage and current at time t; At the same time, according to the definition of fast Fourier transform, the third voltage harmonic component and the third current harmonic component are obtained as shown in equation (5) and equation (6): U3(t)=U1[α3cos(kωt+δ3)] Formula (5) I3(t)=I1[β3cos(kωt+θ3)] Formula (6) In formula (5), U3 represents the amplitude of the third harmonic voltage of the electrical equipment at time t, U1 represents the amplitude of the voltage fundamental component of the electrical equipment in steady state, δ3 represents the phase angle between the fundamental voltage and the third harmonic voltage, and α3 represents the ratio of the amplitude of the third harmonic voltage of the electrical equipment in steady state to its fundamental amplitude; In formula (6), I3 represents the amplitude of the third harmonic current of the electrical equipment at time t, I1 represents the amplitude of the fundamental component of the current of the electrical equipment in steady state, θ3 represents the phase angle between the fundamental current and the third harmonic current, and β3 represents the ratio of the amplitude of the third harmonic current of the electrical equipment in steady state to its fundamental amplitude.

2. A method for identifying microwave oven startup characteristics according to claim 1, characterized in that: The specific method for collecting the instantaneous values ​​of voltage and current on the power distribution bus at a set time is: By installing a high-frequency acquisition terminal or a non-intrusive load identification terminal on the distribution bus that needs to be monitored, the instantaneous values ​​of voltage and current at the set time are collected.

3. A method for identifying microwave oven startup characteristics according to claim 1, characterized in that: The specific formula for calculating the steady-state power increment and the harmonic wave increment within the set time interval based on the basic eigenvectors at the set time moments is: Wherein, N represents the number of set moments in the set time interval; t represents the set moment; i represents the count of the starting moment; Wherein, formula (7) is the calculation method of average increment of active power; formula (8) is the calculation method of average increment of reactive power; formula (9) is the calculation method of average increment of third voltage harmonic; formula (10) is the calculation method of average increment of third current harmonic.

4. A method for identifying microwave oven startup characteristics according to claim 1, characterized in that: Comparing the steady-state power increment and the harmonic wave increment within the set time interval with the multi-dimensional characteristic criterion to determine whether the steady-state power increment and the harmonic wave increment within the set time interval meet the microwave oven startup characteristics includes: The active power average increment is compared with the set active power average increment, and the judgment condition is: ΔP(t)≥first set value Formula (11) Wherein ΔP(t) is the average increment of active power, and the first setting value is the set average increment of active power; If the condition of formula (11) is not met, the instantaneous values ​​of the voltage and current at the set time on the distribution bus are continuously collected; If the condition of formula (11) is met, the average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics are compared with the set average increment of reactive power, the average increment of the third voltage harmonics, and the average increment of the third current harmonics, respectively. The judgment condition is: ΔQ(t)≥second set value; Formula (12) ΔI3(t)≥the third set value; Formula (13) ΔU3(t)≥the fourth set value; Formula (14) Among them, ΔQ(t), ΔI3(t), ΔU3(t) are respectively the average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic; the second set value, the third set value, and the fourth set value are respectively the set average increment of reactive power, the average increment of the third voltage harmonic, and the average increment of the third current harmonic; If equations (12)-(14) are satisfied, the microwave oven is started.

5. A method for identifying microwave oven startup characteristics according to claim 4, characterized in that: The first setting value ranges from 1000W to 1500W, the second setting value ranges from 250Var to 400Var, the third setting value ranges from 1.5A to 2A, and the fourth setting value ranges from 2V to 2.5V.

6. A method for identifying microwave oven startup characteristics according to claim 4, characterized in that: The method further comprises the steps of: When it is determined that the microwave oven is started, the steady-state power increment and harmonic wave increment within the set time interval are defined as microwave oven characteristic tags and stored.

7. A microwave oven startup characteristic identification system, using the microwave oven startup characteristic identification method according to any one of claims 1 to 6, characterized in that: include: The electrical parameter information acquisition module is used to collect the instantaneous values ​​of voltage and current on the power distribution bus at a set time; A basic characteristic quantity calculation module of the startup characteristic, used to calculate the basic characteristic vector at the set time according to the instantaneous values ​​of the voltage and current at the set time, including: voltage effective value, current effective value, active power, reactive power, third voltage harmonic component and third current harmonic component; A steady-state power increment and harmonic increment calculation module, used to calculate the steady-state power increment and harmonic increment within a set time interval according to the basic characteristic vectors at the set moments, including the average increment of active power, the average increment of reactive power, the average increment of the third voltage harmonics and the average increment of the third current harmonics; The microwave oven startup characteristic judgment module is used to compare the steady-state power increment and harmonic increment within the set time interval with the multidimensional characteristic criterion to determine whether the steady-state power increment and harmonic increment within the set time interval meet the microwave oven startup characteristics. If so, the microwave oven is started, wherein the multidimensional characteristic criterion includes the set active power average increment, reactive power average increment, third voltage harmonic average increment and third current harmonic average increment.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a method for identifying microwave oven startup characteristics as described in any one of claims 1 to 6 are implemented.

9. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for identifying microwave oven startup characteristics as described in any one of claims 1 to 6 are implemented.

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