A collaborative measurement and control method and system of a modular combined electric energy metering box

Abstract

The present application relates to the technical field of measurement, more particularly, the present application relates to a kind of modular combined electric energy metering box's collaborative measurement and control method and system, method includes: the voltage, current sequence of acquisition incoming line total control module and each branch metering module, and extract first voltage cooperation degree and first current cooperation degree, adaptively determine the wavelet decomposition layer range of voltage and current, generate multiple decomposition layer candidate combination, to each group is carried out collaborative wavelet denoising;Calculate the second voltage cooperation degree and second current cooperation degree after each group is denoised, with mean maximum as the criterion to select the optimal combination;With original sequence as phase reference, to the denoising sequence in optimal combination is executed reverse phase compensation, obtain pure time sequence matrix, according to this, the active power and cumulative electric energy of each module are calculated.The present application solves the problem of phase shift introduced by wavelet denoising through collaborative wavelet denoising and reverse phase compensation, improves the measurement accuracy of multi-module collaborative measurement and control.

Description

Technical Field

[0001] This invention relates to the field of measurement technology. More specifically, this invention relates to a collaborative measurement and control method and system for a modular combined power metering box. Background Technology

[0002] The modular combined power metering box consists of an incoming main control module and multiple parallel branch metering modules. Each branch module independently collects voltage and current signals and is used for power metering in multi-circuit power distribution scenarios such as residential communities, commercial complexes, and industrial plants.

[0003] In actual operation, power metering signals are easily distorted by electromagnetic interference and thermal noise. Existing technologies typically use wavelet denoising to filter the signal, but the thresholding process in wavelet denoising is a nonlinear operation that can easily introduce phase shift, thereby destroying the original relative phase relationship between voltage and current after denoising. This leads to deviations in active power calculation, making it difficult to guarantee the accuracy of multi-module collaborative measurement and control. Summary of the Invention

[0004] To address the technical problem that existing technologies easily introduce phase shifts during filtering, making it difficult to guarantee the accuracy of multi-module collaborative measurement and control, this invention provides solutions in the following aspects.

[0005] In the first aspect, a collaborative measurement and control method for a modular combined power metering box includes: The voltage and current sequences of the incoming line main control module and each branch metering module are collected, and after normalization, voltage and current time series matrices are constructed. Extract the first voltage coherence degree and the first current coherence degree from the voltage time series matrix and the current time series matrix, and adaptively determine the wavelet decomposition level range of the voltage and the wavelet decomposition level range of the current based on the first voltage coherence degree and the first current coherence degree respectively. Based on the wavelet decomposition level range of voltage and the wavelet decomposition level range of current, multiple candidate combinations consisting of voltage decomposition level and current decomposition level are generated. For each candidate combination, the voltage sequence of all modules is subjected to collaborative wavelet denoising with the same voltage decomposition level, and the current sequence of all modules is subjected to collaborative wavelet denoising with the same current decomposition level, resulting in multiple sets of denoised voltage time series matrices and current time series matrices. For each group of denoised voltage and current time series matrices, the second voltage coherence degree and the second current coherence degree are calculated respectively. The optimal combination is selected based on the criterion of maximizing the mean of the sum of the second voltage coherence degree and the second current coherence degree. Using the original voltage and current time series as the phase reference, reverse phase compensation is performed on the voltage and current time series in the optimal combination to obtain the pure voltage and current time series matrices. The active power and cumulative energy of each module are calculated based on the pure voltage time sequence matrix and the pure current time sequence matrix to complete the coordinated measurement and control.

[0006] Optionally, the extraction of the first voltage coordination degree includes: Using the voltage sequence of the incoming line main control module as a reference, the Euclidean distance between the voltage sequence of each branch module and the reference is calculated as the voltage dispersion of each branch module. Calculate the mean and standard deviation of the voltage dispersion of all branch modules, and calculate the first voltage coordination degree based on the mean and standard deviation of the voltage dispersion of all branch modules.

[0007] Optionally, the extraction of the first current coordination degree includes: For each sampling time, calculate the difference between the current of the incoming main control module and the sum of the currents of all branch modules to obtain the current difference sequence; Calculate the mean and standard deviation of the current difference sequence, and substitute the arithmetic square root of the sum of the squares of the mean and standard deviation into an exponential function with the natural constant as the base to obtain the first current coordination degree.

[0008] Optionally, determining the range of wavelet decomposition levels for the voltage includes: Preset the minimum and maximum number of decomposition layers for the baseline; The maximum number of voltage decomposition layers is obtained by linearly reducing the reference maximum decomposition layer number based on the first voltage coherence and then rounding it up. The wavelet decomposition level of voltage ranges from the minimum reference decomposition level to the maximum voltage decomposition level.

[0009] Optionally, determining the range of wavelet decomposition levels for the current includes: Preset the minimum and maximum number of decomposition layers for the baseline; The maximum number of decomposition layers of the current is obtained by linearly reducing the reference maximum decomposition layer number based on the first current coordination degree and then rounding it up. The wavelet decomposition level of the current ranges from the minimum decomposition level to the maximum decomposition level of the current.

[0010] Optionally, the calculation method for the second voltage coordination degree is the same as that for the first voltage coordination degree, and the calculation method for the second current coordination degree is the same as that for the first current coordination degree.

[0011] Optionally, the method of performing reverse phase compensation includes: A preset reference frame length is established, and the adaptive frame lengths for voltage and current are determined based on the second voltage coordination degree and the second current coordination degree, respectively. For any module, Hilbert transform is performed on the original voltage sequence and the denoised voltage sequence using the adaptive frame length of the voltage to obtain their respective analytical signals, thereby obtaining the instantaneous phase of the original voltage and the instantaneous phase of the denoised voltage. The instantaneous phase of the denoised voltage is replaced with the instantaneous phase of the original voltage while retaining the instantaneous amplitude of the denoised voltage. The real part of the phase-compensated analytical signal is then taken to obtain the phase-corrected voltage signal. This process is performed on all modules in sequence to obtain the pure voltage timing matrix. Using the same method as the pure voltage timing matrix, the current is compensated for inverse phase using the adaptive frame length of the current to obtain the pure current timing matrix.

[0012] Secondly, a collaborative measurement and control system for a modular combined energy metering box includes: a processor and a memory, wherein the memory stores computer program instructions, and when the computer program instructions are executed by the processor, the collaborative measurement and control method for the modular combined energy metering box described in any one of the claims is implemented.

[0013] The present invention has the following beneficial effects: 1. This invention forms a closed-loop collaborative measurement and control process through a complete technical solution, from global collaborative feature extraction, adaptive decomposition layer range determination, multi-combination collaborative denoising optimization, to reverse phase compensation based on the original signal. This solution can dynamically match the denoising intensity according to the current noise level, ensuring consistency of denoising parameters for each module to avoid relative phase shift, and restoring the original relative phase relationship between voltage and current in the phase compensation stage, systematically improving the measurement accuracy and robustness of multi-module collaborative measurement and control.

[0014] 2. This invention quantifies the global interference level from two dimensions: voltage homogeneity and current conservation, through the first voltage coordination degree and the first current coordination degree, respectively. It also uses linear difference to achieve linear adaptive adjustment of the number of decomposition layers, so that the denoising intensity is accurately matched with the operating conditions, avoiding insufficient denoising under strong noise or excessive distortion under weak noise with a fixed number of layers.

[0015] 3. This invention uses the original voltage and current sequences as a reference, determines the adaptive frame length based on the second voltage coherence and the second current coherence, performs Hilbert transform and reverse phase compensation, effectively cancels the nonlinear phase drift introduced by wavelet denoising, and keeps the signal amplitude unchanged, further improving the calculation accuracy of active power and cumulative energy. Attached Figure Description

[0016] Figure 1 This is a flowchart of steps S1-S3 in a collaborative measurement and control method for a modular combined power metering box according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram illustrating the generation of multiple sets of differentiated collaborative wavelet denoising results in a collaborative measurement and control method for a modular combined power metering box according to an embodiment of the present invention.

[0018] Figure 3 This is a structural block diagram of a collaborative measurement and control system for a modular combined power metering box according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0020] The modular combined energy metering box of this invention has the following electrical topology: one incoming line main control module and several branch metering modules are connected in parallel to the same distribution busbar, forming a parallel structure with centralized control of the incoming line and independent metering of the branches. The voltage signals of all modules originate from the same point, i.e., the voltages are from the same source, and the total incoming line current is equal to the sum of the currents of each branch, i.e., current is conserved. This topological constraint is the fundamental premise of the collaborative measurement and control method of this invention.

[0021] Taking a metering box of this type actually in operation in a power distribution room of a residential community as an example for detailed explanation, the metering box includes one incoming main control module and eight branch metering modules, each of which has independent power metering and data acquisition functions.

[0022] Reference Figure 1 A collaborative measurement and control method for a modular combined power metering box includes steps S1-S3, as detailed below: S1: Collect voltage and current timing data from the incoming line main control module and each branch metering module, and preprocess them to obtain voltage timing matrix and current timing matrix.

[0023] To meet the measurement requirements of fundamental and harmonic frequencies for electricity metering, this embodiment of the invention presets a sampling frequency of 1.25kHz, i.e., 25 sampling points per power frequency cycle. The sampling window length is set to N, exemplarily, where N is 250 sampling points, corresponding to 0.2 seconds, encompassing 10 complete power frequency cycles. Real-time voltage and current sequences from the incoming main control module and all branch metering modules are acquired synchronously.

[0024] Furthermore, the voltage and current data above are subjected to conventional Min-Max normalization.

[0025] Furthermore, based on the normalized data described above, voltage and current time series matrices are constructed. The row dimensions of both matrices correspond to metering modules: the first row represents the incoming line control module, and rows 2 through 9 represent branch metering modules, respectively; the column dimensions correspond to the sampling times, with a total of N columns.

[0026] S2: Extract global collaborative features from the voltage time series matrix and the current time series matrix, and generate multiple sets of differentiated collaborative wavelet denoising results accordingly.

[0027] Because the raw voltage and current signals acquired are mixed with electromagnetic interference and thermal noise, directly using them for measurement will lead to significant deviations. Wavelet denoising can effectively filter out noise, but the number of decomposition levels needs to be adaptively determined based on the current noise level, and since voltage and current signals have different characteristics, potentially different denoising intensities need to be used. Simultaneously, all modules' voltage or current signals need to use the exact same number of decomposition levels to prevent relative phase shifts between branches.

[0028] To this end, embodiments of the present invention first quantize the global noise intensity from the voltage time series matrix and the current time series matrix, then adaptively set the decomposition layer range of voltage and current, and then generate all possible layer arrays and merge them to perform collaborative denoising on the voltage time series matrix and the current time series matrix respectively.

[0029] Reference Figure 2 The process of generating multiple sets of differentiated collaborative wavelet denoising results includes steps S20-S22, and the specific process is as follows: S20: Extract the first voltage coherence degree and the first current coherence degree from the voltage time series matrix and the current time series matrix.

[0030] The calculation process for the first voltage coordination degree is as follows: First, taking the voltage sequence of the incoming line master control module at all sampling times, i.e. the first row of the voltage time sequence matrix, as the reference, the Euclidean distance between the voltage sequence of each branch module and the reference is calculated sequentially, which is used as the voltage dispersion of the voltage sequence of each branch module.

[0031] Then, the mean and standard deviation of the voltage dispersion of the voltage sequences of all branch modules are calculated, and the first voltage coordination degree is defined accordingly, which satisfies the following relationship: In the formula, For the first voltage coordination degree, It is a natural constant. Let be the mean of the voltage dispersion of the voltage sequences of all the above branch modules. Let the standard deviation be the voltage dispersion of the voltage sequences of all the above branch modules. It is the hyperbolic tangent function.

[0032] Based on the calculation of the first voltage coordination degree mentioned above, under ideal noise-free operating conditions, the voltage of each branch should be exactly the same as the incoming line voltage. At this time, the voltage dispersion of all voltages is 0. =0 and , =1, reaching its maximum value. When noise interference is present, the voltage waveforms of each branch are distorted, and the mean of voltage dispersion increases. The term decreases; if all branches are affected by similar common-mode noise, although the standard deviation is small, the mean will increase significantly, and the first voltage coordination will still decrease significantly, thus effectively distinguishing between the two operating conditions of being completely clean and being completely polluted by similar noise.

[0033] The calculation of the first current coordination degree is as follows: First, using Kirchhoff's law of conservation of current, the current sequence of the incoming line main control module at all sampling times is extracted, that is, the first row of the current time sequence matrix, which is taken as the total incoming line current. For each sampling time, the current values ​​of all branch modules at the same sampling time are accumulated to obtain the algebraic sum of the currents of all branches at the same sampling time.

[0034] Then, the current difference is calculated at each sampling time, resulting in a current difference sequence. The mean and standard deviation of this current difference sequence are further calculated, thereby defining the first current coherence degree, which satisfies the following relationship: In the formula, For the first current coordination degree, It is a natural constant. The mean of the current difference sequence is... is the standard deviation of the current difference sequence.

[0035] When noise or measurement errors are present, the current difference will be non-zero. This describes systematic DC biases, such as sensor zero-point drift. It describes the fluctuations caused by random noise or harmonics. Through calculation... It also measures the magnitude and degree of fluctuation of the deviation; the larger the value, the more severe the violation of current conservation.

[0036] Thus, the global interference level under the current operating condition has been quantified from the two dimensions of voltage and current through the first voltage coordination degree and the first current coordination degree.

[0037] S21: Based on the first voltage coherence and the first current coherence, adaptively set the range of wavelet decomposition levels for voltage and current.

[0038] The core parameter of wavelet denoising is the number of decomposition levels: the larger the number of levels, the stronger the noise separation capability, but it may also introduce more signal phase or amplitude distortion. Therefore, it is necessary to dynamically adjust the maximum decomposition levels of voltage and current according to the current noise level, i.e., the first voltage coherence and the first current coherence, so that the denoising intensity matches the operating conditions, avoiding insufficient denoising under strong noise or excessive denoising under weak noise with a fixed number of levels.

[0039] First, an orthogonal wavelet basis db4 with linear phase characteristics is pre-selected to minimize the phase deviation introduced during wavelet decomposition and reconstruction.

[0040] Then, the minimum number of baseline decomposition layers is set to 2, and the maximum number of baseline decomposition layers is set to... N is 250, which is the total number of sampling points of S1 mentioned above.

[0041] Based on the first voltage coherence and the first current coherence mentioned above, the maximum number of decomposition layers for voltage and current are calculated respectively.

[0042] The maximum number of decomposition levels for the above voltages satisfies the following relationship: In the formula, This represents the maximum number of voltage decomposition layers. The minimum number of decomposition layers is set above. The maximum number of decomposition layers is set above. This represents the first voltage coordination degree.

[0043] when When it is large, Approaching the baseline minimum decomposition level, avoiding distortion introduced by excessive denoising; when When smaller, It extends to the maximum decomposition level of the baseline, thereby enhancing denoising capabilities.

[0044] The calculation of the maximum number of decomposition levels for current is based on the same logic as the calculation of the maximum number of decomposition levels for voltage, i.e., it satisfies the following relationship: In the formula, The maximum number of decomposition layers of the current. The minimum number of decomposition layers is set above. The maximum number of decomposition layers is set above. This represents the first current coordination degree.

[0045] Therefore, through the above calculations, the denoising intensity is dynamically adapted to the current noise level, which can effectively suppress interference under strong noise and avoid signal distortion under weak noise.

[0046] The final range of voltage decomposition levels is obtained as follows: The range of decomposition layers of the current: .

[0047] S22: Based on the wavelet decomposition level range of voltage and current, generate multiple sets of voltage-current level combinations, and perform cooperative wavelet denoising on the voltage time series matrix and the current time series matrix.

[0048] To select the optimal set of denoising parameters from the possible options, it is necessary to list all legal combinations of voltage and current layers and denoise the voltage and current signals separately according to the specified number of layers for each group, while ensuring that the denoising parameters of all modules are consistent to avoid introducing additional relative phase shifts between branches.

[0049] For example, let the candidate values ​​for the number of voltage layers be... Take all All integers within the range, and similarly, candidate values ​​for the current layer number. Take all All integers within the range, after permutation and combination, form multiple groups. Each group represents a denoising strategy.

[0050] It should be noted that in this embodiment of the invention, the number of sampling points N is equal to 250, and the maximum number of baseline decomposition layers is [not specified]. It equals 7, in reality and Each combination has a maximum of 7, and the number of candidate combinations can be no more than 36. The denoising process for each combination is independent and can be computed in parallel.

[0051] For each candidate combination Perform the following collaborative denoising process: First, the voltage time series matrix is ​​denoised. For each row of the voltage time series matrix, i.e., the voltage sequence of each module, the same denoising process is used. Wavelet decomposition is performed, and the detail coefficients obtained from each decomposition layer are quantized using soft thresholding. The threshold is dynamically determined based on the median absolute deviation of the detail coefficients of the current layer.

[0052] Then, the denoised voltage sequence of each module is obtained through wavelet reconstruction. After all modules have been processed, the denoised voltage time series matrix under the candidate combination is obtained by summing them up.

[0053] Next, the current timing matrix is ​​denoised. For each row of the current timing matrix, i.e., the current sequence of each module, the same denoising method is used. Similarly, soft thresholding quantization is applied to the detail coefficients obtained from each decomposition layer, and wavelet reconstruction is used to obtain the denoised current sequence of each module. After all modules have been processed, the denoised current time series matrix under the candidate combination is obtained.

[0054] Record each candidate combination and its corresponding denoised voltage and current timing matrices. This yields multiple denoising results.

[0055] S3: Evaluate and select the best of the generated multiple sets of differentiated collaborative wavelet denoising results, perform phase compensation, and complete collaborative metrology.

[0056] The above S2 has obtained multiple sets of denoised voltage and current time series matrices, but it is necessary to select the optimal set from them. In addition, since the voltage and current may have used different decomposition levels, wavelet transform will introduce different degrees of nonlinear phase drift, which will destroy the original relative phase relationship between voltage and current.

[0057] Therefore, in this embodiment of the invention, it is necessary to first select the group that optimizes the voltage coordination and current coordination from all candidate combinations, then perform dynamic phase compensation on the denoised signal of the group to restore the correct phase relationship, and finally calculate the power and cumulative energy of each module based on the compensated clean signal.

[0058] First, for each set of denoising results, i.e., the denoised voltage time-series matrix and current time-series matrix, the method in S20 above is reused to calculate the second voltage coherence degree and the second current coherence degree, respectively. The larger the value, the better the voltage homology and current conservation of the denoised signal, that is, the higher the denoising quality.

[0059] Then, the mean of the sum of the second voltage synergy and the second current synergy is calculated for each group of denoising effects, and this is used as the denoising effect score.

[0060] Furthermore, the group with the highest noise reduction score is selected as the optimal combination.

[0061] Next, a baseline frame length is preset and denoted as... ,For example =50 sampling points.

[0062] Furthermore, the adaptive frame lengths of voltage and current are determined using the second voltage coordination degree and the second current coordination degree calculated by the optimal combination.

[0063] The adaptive frame length of the above voltage satisfies the following relationship: In the formula, For voltage-adaptive frame length, As the baseline frame length, This represents the second voltage coordination degree. (Using...) Function mapping can naturally constrain the lower limit of the output frame length, avoiding physically meaningless minimal windows when the frame length approaches 0. When the second voltage coherence is large, the frame length is large to improve the phase estimation accuracy; when the second voltage coherence is small, the frame length is small to enhance adaptability.

[0064] The calculation logic for the adaptive frame length of current is consistent with the above-mentioned calculation logic for the adaptive frame length of voltage, that is, it satisfies the following relationship: In the formula, For adaptive frame length of current, As the baseline frame length, This represents the second current coordination degree.

[0065] Furthermore, using the voltage sequences of each module in the voltage timing matrix of S1 above as the phase reference, reverse phase compensation is performed on the voltage sequences of the corresponding modules in the denoised voltage timing matrix.

[0066] Taking any module as an example, the original voltage sequence and the denoised voltage sequence of the module are extracted. The Hilbert transform is then performed on the two sequences using the adaptive frame length of the voltage calculated above to obtain their respective analytical signals. In turn, the instantaneous phase of the original voltage sequence and the instantaneous phase of the denoised voltage sequence are obtained.

[0067] Using the instantaneous phase of the original voltage sequence as a reference, the instantaneous phase of the denoised voltage sequence is inversely compensated. Specifically, the instantaneous amplitude and instantaneous phase of the original signal and the denoised signal are obtained through Hilbert transform. Wavelet soft-threshold denoising mainly affects the phase component of the detail coefficients, while its impact on the amplitude is relatively small. Therefore, this invention retains the instantaneous amplitude of the denoised signal to maintain the denoised energy level, and replaces its instantaneous phase with the instantaneous phase of the original signal, thereby constructing a new analytic signal and taking its real part to obtain the phase-corrected voltage signal. This hybrid strategy can theoretically effectively compensate for the phase shift introduced by wavelet denoising, and in the typical power signal operating conditions of this embodiment, the correction effect is better than directly using the denoised signal. All modules are executed sequentially to obtain the phase-compensated pure voltage time series matrix.

[0068] Similarly, using the original current sequence as the phase reference, reverse phase compensation is performed on the current timing of each module in the denoised current sequence, with the sliding window employing... This yields the pure current timing matrix. The specific operation is the same as that for the pure voltage timing matrix described above, and will not be repeated here.

[0069] Finally, for any module, the instantaneous power is calculated from the pure voltage and pure current. Integrating the instantaneous power over one power frequency cycle yields the average active power. Multiplying the average active power by time gives the cumulative electrical energy from the start time to the current time.

[0070] The active power and cumulative energy of each module are calculated and output separately for the main control module and all branch modules.

[0071] This completes the entire process of collaborative measurement and control for the modular combined power metering box.

[0072] This invention also provides a collaborative measurement and control system for a modular, combined power metering box. For example... Figure 3 As shown, the system includes a processor and a memory. The memory stores computer program instructions. When the computer program instructions are executed by the processor, the system implements the collaborative measurement and control method of the modular combined power metering box according to the first aspect of the present invention.

[0073] The system also includes other components well known to those skilled in the art, such as communication buses and communication interfaces, the settings and functions of which are known in the art and will not be described in detail here.

[0074] It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of this invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A cooperative measurement and control method of a modular combined electric energy metering box, characterized in that, include: The voltage and current sequences of the incoming line main control module and each branch metering module are collected, and after normalization, voltage and current time series matrices are constructed. Extract the first voltage coherence degree and the first current coherence degree from the voltage time series matrix and the current time series matrix, and adaptively determine the wavelet decomposition level range of the voltage and the wavelet decomposition level range of the current based on the first voltage coherence degree and the first current coherence degree respectively. Based on the wavelet decomposition level range of voltage and the wavelet decomposition level range of current, multiple candidate combinations consisting of voltage decomposition level and current decomposition level are generated. For each candidate combination, the voltage sequence of all modules is subjected to collaborative wavelet denoising with the same voltage decomposition level, and the current sequence of all modules is subjected to collaborative wavelet denoising with the same current decomposition level, resulting in multiple sets of denoised voltage time series matrices and current time series matrices. For each group of denoised voltage and current time series matrices, the second voltage coherence degree and the second current coherence degree are calculated respectively. The optimal combination is selected based on the criterion of maximizing the mean of the sum of the second voltage coherence degree and the second current coherence degree. Using the original voltage and current time series as the phase reference, reverse phase compensation is performed on the voltage and current time series in the optimal combination to obtain the pure voltage and current time series matrices. The active power and cumulative energy of each module are calculated based on the pure voltage time sequence matrix and the pure current time sequence matrix to complete the coordinated measurement and control.

2. The collaborative measurement and control method for a modular combined power metering box according to claim 1, characterized in that, The extraction of the first voltage coordination degree includes: Using the voltage sequence of the incoming line main control module as a reference, the Euclidean distance between the voltage sequence of each branch module and the reference is calculated as the voltage dispersion of each branch module. Calculate the mean and standard deviation of the voltage dispersion of all branch modules, and calculate the first voltage coordination degree based on the mean and standard deviation of the voltage dispersion of all branch modules.

3. The collaborative measurement and control method for a modular combined power metering box according to claim 1, characterized in that, The extraction of the first current coordination degree includes: For each sampling time, calculate the difference between the current of the incoming main control module and the sum of the currents of all branch modules to obtain the current difference sequence; Calculate the mean and standard deviation of the current difference sequence, and substitute the arithmetic square root of the sum of the squares of the mean and standard deviation into an exponential function with the natural constant as the base to obtain the first current coordination degree.

4. The collaborative measurement and control method for a modular combined power metering box according to claim 1, characterized in that, The determination of the wavelet decomposition level range of the voltage includes: Preset the minimum and maximum number of decomposition layers for the baseline; The maximum number of voltage decomposition layers is obtained by linearly reducing the reference maximum decomposition layer number based on the first voltage coherence and then rounding it up. The wavelet decomposition level of voltage ranges from the minimum reference decomposition level to the maximum voltage decomposition level.

5. The collaborative measurement and control method for a modular combined power metering box according to claim 4, characterized in that, The determination of the wavelet decomposition level range of the current includes: Preset the minimum and maximum number of decomposition layers for the baseline; The maximum number of decomposition layers of the current is obtained by linearly reducing the reference maximum decomposition layer number based on the first current coordination degree and then rounding it up. The wavelet decomposition level of the current ranges from the minimum decomposition level to the maximum decomposition level of the current.

6. The collaborative measurement and control method for a modular combined power metering box according to claim 1, characterized in that, The calculation method for the second voltage coordination degree is the same as that for the first voltage coordination degree, and the calculation method for the second current coordination degree is the same as that for the first current coordination degree.

7. The collaborative measurement and control method for a modular combined power metering box according to claim 1, characterized in that, The methods for performing reverse phase compensation include: A preset reference frame length is established, and the adaptive frame lengths for voltage and current are determined based on the second voltage coordination degree and the second current coordination degree, respectively. For any module, Hilbert transform is performed on the original voltage sequence and the denoised voltage sequence using the adaptive frame length of the voltage to obtain their respective analytical signals, thereby obtaining the instantaneous phase of the original voltage and the instantaneous phase of the denoised voltage. The instantaneous phase of the denoised voltage is replaced with the instantaneous phase of the original voltage while retaining the instantaneous amplitude of the denoised voltage. The real part of the phase-compensated analytical signal is then taken to obtain the phase-corrected voltage signal. This process is performed on all modules in sequence to obtain the pure voltage timing matrix. Using the same method as the pure voltage timing matrix, the current is compensated for inverse phase using the adaptive frame length of the current to obtain the pure current timing matrix.

8. A collaborative measurement and control system for a modular combined power metering box, characterized in that, include: A processor and a memory, wherein the memory stores computer program instructions that, when executed by the processor, implement the collaborative measurement and control method for the modular combined power metering box according to any one of claims 1-7.

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