System and method for realizing current dynamic conversion based on phase correction

Abstract

The invention provides a system and a method for realizing current dynamic conversion based on phase correction. The system and the method are used for adjusting a phase relation between a current signal and a voltage signal. The system comprises a current transformer which is used for measuring a current signal in a measured circuit and uploading the current signal to a signal conditioning circuit; the voltage transformer is used for measuring a voltage signal in the measured circuit and uploading the voltage signal to the signal conditioning circuit; the signal conditioning circuit is used for receiving the current signal and the voltage signal, carrying out noise reduction processing on the current signal and the voltage signal, carrying out phase correction on the current signal and the voltage signal after noise reduction, and uploading the current signal and the voltage signal after phase correction to the processor; the clock module is used for recording timestamps for measuring the current signal and the voltage signal; and the processor is used for calculating required power data according to the current signal and the voltage signal after phase correction and the timestamps of the current signal and the voltage signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric energy metering, in particular to a system and method for realizing current dynamic conversion based on phase correction. BACKGROUND

[0002] In the power system, electric energy metering is a key link to ensure the fairness of power transaction and improve the efficiency of power grid operation. The traditional electric energy metering system mainly relies on current transformers (CT) and voltage transformers (VT) to sample the current and voltage in the circuit, and convert these signals into a range suitable for detection by the electric energy meter.

[0003] However, this conversion process does not take into account the phase correction, which has the following technical problems: phase difference introduces error: when the current and voltage signals are transmitted and converted, due to the core loss of the transformer, the wire impedance, the temperature change and other factors, an additional phase difference will be generated between them. The existence of this phase difference will directly affect the calculation of the power factor, and thus lead to inaccurate electric energy metering. Especially in the environment of low power factor, the error of phase difference will be significantly amplified, and the influence on electric energy metering is more serious; insufficient harmonic component suppression: there are often harmonics in the power system, i.e. alternating current components with an integer multiple of the fundamental frequency. If no phase correction is performed, the suppression ability of the current transformer and the voltage transformer to the harmonic will be reduced, so that the final electric energy metering result is disturbed by the harmonic, the precision is reduced, etc. SUMMARY

[0004] The embodiments of the present application provide a system and method for realizing current dynamic conversion based on phase correction, which adjusts the phase relationship between the current signal and the voltage signal, and improves the precision of power data measurement.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a system for realizing current dynamic conversion based on phase correction, which comprises:

[0007] a current transformer for measuring the current signal in the measured circuit and uploading the current signal to the signal conditioning circuit;

[0008] a voltage transformer for measuring the voltage signal in the measured circuit and uploading the voltage signal to the signal conditioning circuit;

[0009] a signal conditioning circuit for receiving the current signal and the voltage signal, and performing noise reduction processing on the current signal and the voltage signal, performing phase correction on the noise-reduced current signal and voltage signal, and uploading the phase-corrected current signal and voltage signal to the processor;

[0010] The clock module is used to record the timestamps of the measured current and voltage signals;

[0011] The processor is used to calculate the required power data based on the phase-corrected current and voltage signals, as well as the timestamps of the current and voltage signals.

[0012] Secondly, this application provides a method for dynamic current conversion based on phase correction, the method comprising:

[0013] Measure the current and voltage signals in the circuit under test;

[0014] The current and voltage signals are denoised, and the denoised voltage and current signals are then phase-corrected.

[0015] Record the timestamps of the measured current and voltage signals;

[0016] The required power data is calculated based on the phase-corrected current and voltage signals, as well as the timestamps of the measured current and voltage signals.

[0017] In this embodiment, the system for dynamic current conversion based on phase correction provided in this application aims to improve the measurement accuracy and system stability of current and voltage signals. Using current and voltage transformers, the system can accurately measure the current and voltage signals in the circuit under test, providing precise data for subsequent signal processing. Simultaneously, to eliminate temperature interference, a temperature detection element and a temperature control module are configured to monitor and adjust the temperature in real time, avoiding signal errors caused by temperature changes. The signal conditioning circuit is responsible for phase correction of the current and voltage signals, eliminating phase shifts caused by circuit or external factors, thereby ensuring signal accuracy and consistency. In summary, this system can adjust the phase relationship between current and voltage signals, improving the accuracy of power data measurement.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a system for dynamic current conversion based on phase correction provided in an embodiment of this application;

[0021] Figure 2 This is a flowchart illustrating a method for dynamic current conversion based on phase correction, provided in an embodiment of this application. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments in this specification clearer, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. The components of the embodiments of this specification described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this specification provided in the accompanying drawings is not intended to limit the scope of the claimed specification, but merely to illustrate selected embodiments of this specification. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without inventive effort are within the scope of protection of this specification.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments in this specification, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing this specification and for 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. Therefore, they should not be construed as limitations on this specification. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments in this specification, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0028] The following section will describe in detail a system for dynamic current conversion based on phase correction, which can adjust the phase relationship between current and voltage signals and improve the accuracy of power data measurement.

[0029] Figure 1 This is a schematic diagram of the system for dynamic current conversion based on phase correction, provided in an embodiment of this application.

[0030] like Figure 1 As shown, this system for dynamic current conversion based on phase correction mainly includes:

[0031] A current transformer is used to measure the current signal in the circuit under test and transmit the current signal to the signal conditioning circuit.

[0032] A voltage transformer is used to measure the voltage signal in the circuit under test and transmit the voltage signal to the signal conditioning circuit.

[0033] The signal conditioning circuit is used to receive current signals and voltage signals, perform noise reduction processing on the current signals and voltage signals, perform phase correction on the noise-reduced current signals and voltage signals, and upload the phase-corrected current signals and voltage signals to the processor.

[0034] The clock module is used to record the timestamps of the measured current and voltage signals;

[0035] The processor is used to calculate the required power data based on the phase-corrected current and voltage signals, as well as the timestamps of the current and voltage signals.

[0036] The primary side of both the current transformer and the voltage transformer is connected to the signal conditioning circuit, and the other secondary side is connected to the circuit under test. The signal conditioning circuit, memory, clock module, and communication unit are all connected to the processor.

[0037] In addition, the system also includes: a memory for storing data received and calculated by the processor; a communication module for transmitting data received and calculated by the processor to the management system; and a power supply module for supplying power to the system.

[0038] It should be noted that the current and voltage signals output by the aforementioned current transformers and voltage transformers are electrical signals suitable for measurement by electricity meters.

[0039] In this embodiment, both the current transformer and the voltage transformer include a temperature detection element.

[0040] Temperature sensing elements are used to monitor the operating temperature of current transformers and voltage transformers in real time when measuring current and voltage signals in the circuit under test, and to upload the operating temperature of current transformers and voltage transformers to the signal conditioning circuit.

[0041] Correspondingly, the signal conditioning circuit is used to correct the current and voltage signals transmitted by the current and voltage transformers based on their operating temperatures.

[0042] When the current transformer is working, the copper loss of the internal conductive cable and the iron loss of the iron core will generate heat, causing the temperature to rise. The temperature change will change the magnetic permeability of the iron core (affecting the accuracy of electromagnetic induction) and the resistance of the conductive cable (affecting the current transmission), which will lead to errors in the current / voltage, so correction is required.

[0043] In this embodiment, the system also includes a temperature control module, which is connected to the temperature detection element in the current transformer and voltage transformer, and is used to adjust the temperature in the current transformer and voltage transformer to a standard range, wherein the standard range is preset.

[0044] Specifically, the temperature control module can be connected via injection holes and circulation pipelines. For example, the outer side of the current transformer / voltage transformer housing has two injection holes, each equipped with a miniature valve. These valves are connected to the heating / cooling unit of the temperature control module via circulation pipelines. The circulation pipelines are filled with the same insulating heat-conducting liquid as the flexible heat-conducting tubes, forming a heat-conducting liquid circulation loop. If the temperature detection element detects that the transformer temperature is too high (e.g., exceeding 40°C), it will control the miniature valves to open, and the circulation pipeline will inject the cooled heat-conducting liquid into the flexible heat-conducting tubes while simultaneously draining the heated and expanded liquid from the tubes. This heat exchange reduces the internal temperature of the transformer.

[0045] The signal conditioning circuit includes an α sign register, an all-pass filter coefficient parameter register, an all-pass filter, and a gating circuit.

[0046] The α sign register is used to calculate and store the phase difference increment between the denoised current signal and the voltage signal.

[0047] The all-pass filter coefficient parameter register is used to read the phase difference increment from the α sign register, convert the phase difference increment into parameters recognizable by the all-pass filter, and store the parameters.

[0048] The gating circuit is used to determine the state of the all-pass filter and the selection of the signal path based on the phase difference increment stored in the α sign register;

[0049] The all-pass filter is used to read the stored parameters from the all-pass filter coefficient parameter register, configure its own filtering parameters, and then perform phase correction on the noise-reduced current signal and the current signal.

[0050] It's important to note that the core of phase correction is utilizing the phase shifting characteristics of an all-pass filter to achieve reverse cancellation of the phase difference. An all-pass filter is a special signal processing unit characterized by almost no attenuation of the input signal amplitude (keeping the signal amplitude constant) while precisely controlling the signal phase (leading or lagging the signal phase by a specific angle). In electrical energy measurement, the current signal (from a current transformer) and voltage signal (from a voltage transformer) should ideally maintain a fixed phase relationship (e.g., the phase difference between a sinusoidal current and voltage is determined by the load power factor). However, in reality, factors such as transformer core losses, conductor impedance, and temperature changes (e.g., the subtle effect of thermal expansion of the elastic heat pipe in a current transformer on signal transmission) can cause an additional phase difference increment α. Without correction, this directly leads to errors in power and energy calculations (especially significant in low power factor scenarios). The role of the all-pass filter is to specifically generate a phase shift equal in magnitude but opposite in direction to α, thereby canceling the effect of α and restoring the corrected current synchronization signal and voltage synchronization signal to their ideal phase relationship.

[0051] In addition, the α sign register calculates the phase difference increment between the denoised current signal and the voltage signal and stores three possible cases for the phase difference increment: α>0, α<0, and α=0. Where α>0 indicates that the current signal phase leads the voltage signal (the current signal phase needs to be delayed for synchronization); α<0 indicates that the voltage signal phase leads the current signal (the voltage signal phase needs to be delayed for synchronization); and α=0 indicates that there is no additional phase difference between the two and no correction is required.

[0052] It should also be noted that the sign of α is stored in the α sign register (generally: α>0 corresponds to 0, α<0 corresponds to 1, α=0 corresponds to 2), and the specific value of α is quantized (converted into a parameter that the all-pass filter can recognize) and stored in the all-pass filter coefficient parameter register.

[0053] The following explains how to correct the error based on the three scenarios described above:

[0054] If the phase difference increment α calculated and stored by the α sign register is positive, the corresponding gating circuit will connect the full-pass filter to the current signal channel, bypass the voltage signal channel directly, and the current signal will pass through the full-pass filter, with the phase being precisely delayed by α angle, and output a current synchronization signal.

[0055] If the phase difference increment α calculated and stored by the α sign register is negative, the corresponding gating circuit will connect the full-pass filter to the voltage signal channel and bypass the current signal channel directly. The voltage signal passes through the full-pass filter and its phase is precisely delayed by |α| angles (that is, the current signal phase leads by α angles), and the output voltage synchronization signal is generated.

[0056] If the phase difference increment α calculated and stored by the α sign register is zero, the corresponding gating circuit will bypass both the current signal channel and the voltage signal channel.

[0057] It should be noted that the above signal channels are not processed when they are bypassed. The signal channels processed by the all-pass filter eliminate the influence of the additional phase difference α, restore the ideal phase relationship, and can be directly used for subsequent accurate calculation of active power, reactive power, and electrical energy.

[0058] In this embodiment, the signal conditioning circuit further includes a signal amplifier, which is used to adjust the noise-reduced current signal and voltage signal to a level range suitable for processing by the all-pass filter before phase correction.

[0059] It's understandable that all-pass filters primarily adjust the phase of signals, but their filtering effect is usually related to the amplitude (level) of the input signal. If the signal level is too low, the all-pass filter may not work effectively or achieve the expected phase correction effect; conversely, if the signal level is too high, it may cause distortion or overload in the filter. Therefore, a signal amplifier is used to adjust the signal level to a range suitable for the all-pass filter to ensure that it can stably perform phase correction on the signal, unaffected by the signal level.

[0060] In this embodiment, the system further includes a display unit, which is used to display the required power data calculated by the processor in real time.

[0061] In summary, the system for dynamic current conversion based on phase correction provided in this application aims to improve the measurement accuracy and system stability of current and voltage signals. Through current and voltage transformers, the system can accurately measure the current and voltage signals in the circuit under test, providing precise data for subsequent signal processing. Simultaneously, to eliminate temperature interference, a temperature detection element and a temperature control module are configured to monitor and adjust the temperature in real time, avoiding signal errors caused by temperature changes. The signal conditioning circuit is responsible for phase correction of the current and voltage signals, eliminating phase shifts caused by circuit or external factors, thereby ensuring signal accuracy and consistency. In conclusion, this system can adjust the phase relationship between current and voltage signals, improving the accuracy of power data measurement.

[0062] The above combination Figure 1 This application describes the system for dynamic current conversion based on phase correction provided in the embodiments of this application. The following is in conjunction with... Figure 2 This describes a method for achieving dynamic current conversion based on phase correction.

[0063] Step S101: Measure the current signal and voltage signal in the circuit under test;

[0064] Step S102: Denoise the current signal and voltage signal, and perform phase correction on the denoised voltage signal and current signal.

[0065] Step S103: Record the timestamps of the measured current and voltage signals;

[0066] Step S104: Calculate the required power data based on the phase-corrected current and voltage signals, and the timestamps of the measured current and voltage signals.

[0067] In this embodiment, the current signal and voltage signal in the circuit under test are measured by a current transformer and a voltage transformer, respectively. Correspondingly, after measuring the current signal and voltage signal in the circuit under test, the method further includes:

[0068] Monitor the operating temperature of current transformers and voltage transformers;

[0069] Based on the operating temperature of the current transformer and voltage transformer, the measured current and voltage signals of the current transformer and voltage transformer are corrected.

[0070] In this embodiment, phase correction is performed on the noise-reduced voltage and current signals, including:

[0071] Calculate the phase difference increment between the noise-reduced current signal and voltage signal;

[0072] Based on the phase difference increment, the voltage and current signals after noise reduction are phase corrected.

[0073] In this embodiment, after noise reduction processing of the current signal and voltage signal, the method further includes:

[0074] Adjust the noise-reduced current and voltage signals to the preset level range.

[0075] Furthermore, the specific implementation of the above method is basically similar to the system implementation, so the description is relatively simple. For relevant details, please refer to the description of the system implementation.

[0076] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the scope of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0077] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A system for dynamic current conversion based on phase correction, characterized in that, The system includes: A current transformer is used to measure the current signal in the circuit under test and upload the current signal to the signal conditioning circuit. A voltage transformer is used to measure the voltage signal in the circuit under test and upload the voltage signal to the signal conditioning circuit. The signal conditioning circuit is used to receive the current signal and the voltage signal, perform noise reduction processing on the current signal and the voltage signal, perform phase correction on the noise-reduced current signal and voltage signal, and upload the phase-corrected current signal and voltage signal to the processor. A clock module is used to record the timestamps for measuring the current signal and the voltage signal; The processor is configured to calculate the required power data based on the phase-corrected current and voltage signals, and the timestamps of the current and voltage signals.

2. The system for dynamic current conversion based on phase correction according to claim 1, characterized in that, Both the current transformer and the voltage transformer include a temperature detection element inside. The temperature detection element is used to monitor the operating temperature of the current transformer and the voltage transformer in real time when the current transformer and the voltage transformer measure the current signal and voltage signal in the circuit under test, and to upload the operating temperature of the current transformer and the voltage transformer to the signal conditioning circuit. Correspondingly, the signal conditioning circuit is used to correct the current signal and voltage signal transmitted by the current transformer and the voltage transformer based on the operating temperature of the current transformer and the voltage transformer.

3. The system for dynamic current conversion based on phase correction according to claim 2, characterized in that, The system also includes a temperature control module, which is connected to the temperature detection element in the current transformer and the voltage transformer, and is used to adjust the temperature in the current transformer and the voltage transformer to a standard range, wherein the standard range is preset.

4. The system for dynamic current conversion based on phase correction according to claim 1, characterized in that, The signal conditioning circuit includes an α positive / negative register, an all-pass filter coefficient parameter register, an all-pass filter, and a gating circuit; The α sign register is used to calculate and store the phase difference increment between the denoised current signal and the voltage signal. The all-pass filter coefficient parameter register is used to read the phase difference increment from the α sign register, convert the phase difference increment into parameters recognizable by the all-pass filter, and store the parameters; The gating circuit is used to determine the state of the all-pass filter and the selection of the signal channel based on the phase difference increment stored in the α positive and negative register; The all-pass filter is used to read the stored parameters from the all-pass filter coefficient parameter register, configure its own filtering parameters, and then perform phase correction on the noise-reduced current signal and the current signal.

5. The system for dynamic current conversion based on phase correction according to claim 4, characterized in that, If the phase difference increment α calculated and stored by the α sign register is positive, the corresponding gating circuit connects the full-pass filter to the current signal channel and bypasses the voltage signal channel. The current signal passes through the full-pass filter, and its phase is precisely delayed by α angle, outputting a current synchronization signal. If the phase difference increment α calculated and stored by the α sign register is negative, the corresponding gating circuit connects the full-pass filter to the voltage signal channel and bypasses the current signal channel. The voltage signal passes through the full-pass filter, and its phase is precisely delayed by |α| angles, outputting a voltage synchronization signal. If the phase difference increment α calculated and stored by the α sign register is zero, the corresponding gating circuit will bypass both the current signal channel and the voltage signal channel.

6. The system for dynamic current conversion based on phase correction according to claim 4 or 5, characterized in that, The signal conditioning circuit further includes a signal amplifier, which is used to adjust the noise-reduced current signal and voltage signal to a level range suitable for processing by the all-pass filter before phase correction.

7. A method for dynamic current conversion based on phase correction, characterized in that, include: Measure the current and voltage signals in the circuit under test; The current signal and voltage signal are subjected to noise reduction processing, and the noise-reduced voltage signal and current signal are then phase-corrected. Record the timestamps for measuring the current and voltage signals; The required power data is calculated based on the phase-corrected current and voltage signals, and the timestamps used to measure the current and voltage signals.

8. The method for dynamic current conversion based on phase correction according to claim 7, characterized in that, The current and voltage signals in the circuit under test are measured by a current transformer and a voltage transformer, respectively. Correspondingly, after measuring the current and voltage signals in the circuit under test, the method further includes: Monitor the operating temperature of the current transformer and the voltage transformer; The current and voltage signals measured by the current and voltage transformers are corrected based on their operating temperatures.

9. The method for dynamic current conversion based on phase correction according to claim 7, characterized in that, The step of performing phase correction on the noise-reduced voltage and current signals includes: Calculate the phase difference increment between the noise-reduced current signal and voltage signal; Based on the phase difference increment, the voltage and current signals after noise reduction are phase corrected.

10. The method for dynamic current conversion based on phase correction according to claim 7, characterized in that, After performing noise reduction processing on the current signal and voltage signal, the method further includes: Adjust the noise-reduced current and voltage signals to the preset level range.

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