A remote dynamic current evaluation method and system based on AC / DC comparison technology

Abstract

The present invention discloses a remote dynamic current evaluation method and system based on AC / DC comparison technology in the field of power supply technology, including initializing a reference DC voltage of a reference voltage generator; collecting current signals, performing analog-to-digital conversion on AC signals, and obtaining AC parameters; comparing DC parameters with reference AC parameters to evaluate the quality of DC output; and dynamically adjusting the reference voltage value and sampling frequency according to the evaluation results. Beneficial effects of the present invention: Through the AC / DC comparison technology, reference AC parameters can be dynamically generated and accurately compared with the converted DC output, avoiding the errors caused by the use of fixed AC parameters in traditional systems, and ensuring high-precision current calibration of charging piles under various power grid fluctuation conditions; the use of non-integer cycle sampling technology can improve the capture accuracy of AC signals, reduce sampling errors, and further improve the overall performance of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a remote dynamic current evaluation method and system based on AC / DC comparison technology. Background Art

[0002] With the popularity of electric vehicles, charging piles have become key infrastructure. However, due to the complexity of the power grid environment and the high requirements of electric vehicles for charging efficiency and stability, traditional charging pile systems face many challenges in current and voltage calibration. Especially when the power grid fluctuates and the load changes frequently, how to ensure the accurate output of current and voltage during charging directly affects the charging efficiency and battery life. Most existing charging pile calibration systems use fixed AC parameters for calibration, and fail to dynamically adapt to complex power grid conditions, resulting in deficiencies in charging efficiency and output stability.

[0003] In the prior art, the AC signal can be captured and further analyzed by calibrating the precision inductor in the circuit, and the parameters of the AC can be measured without the need for an AC receiving circuit. The performance expression of the measuring device and the response to the signal can also be analyzed by setting a control circuit and an amplification circuit to adjust the measuring device. The above methods all propose performance evaluation methods for AC-DC conversion or measuring equipment, but for the AC-DC conversion performance evaluation of large-scale charging equipment, more efficient application solutions are still needed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is how to evaluate the AC / DC conversion performance of large-scale charging equipment.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a remote dynamic current evaluation method based on AC / DC comparison technology, comprising: initializing a reference DC voltage of a reference voltage generator; collecting current signals, performing analog-to-digital conversion on AC signals, and obtaining AC parameters; comparing DC parameters with reference AC parameters to evaluate the quality of DC output; and dynamically adjusting the reference voltage value and sampling frequency according to the evaluation results.

[0008] As a preferred solution of the remote dynamic current evaluation method based on AC / DC comparison technology described in the present invention, the collected current signal includes the AC power signal of the AC power grid and the converted DC output voltage and current.

[0009] As a preferred solution of the remote dynamic current evaluation method based on AC / DC comparison technology described in the present invention, the current signal sampling method adopts non-integer cycle sampling to improve the capture accuracy of the AC signal and reduce sampling errors.

[0010] Another object of the present invention is to provide a remote dynamic current evaluation system based on AC / DC comparison technology, aiming to solve the problem that using a fixed sampling frequency for data acquisition may cause sampling errors and frequency aliasing, thereby affecting the accuracy of current evaluation.

[0011] As a preferred solution of the remote dynamic current evaluation system based on AC / DC comparison technology described in the present invention, it comprises: a conversion module, an acquisition module, a comparison module and a control module; the control module is remotely connected to one or more of the comparison modules in communication; the input end of the conversion module is connected to the AC power grid, and the output end is connected to the power load, and is configured to convert the AC power from the AC power grid into DC power and output DC power to the power load; the acquisition module is electrically connected to the DC output end of the conversion module, and is configured to acquire the DC output voltage U1 and current I1 of the conversion module, and calculate the output power; the comparison module is electrically connected to the input end of the AC power grid, and is communicatively connected to the conversion module and the acquisition module; the control module is configured to dynamically set the working parameters of the comparison module based on the evaluation result of the comparison module, and the working parameters of the comparison module include the reference voltage value and the sampling frequency.

[0012] As a preferred solution of the remote dynamic current evaluation system based on AC / DC comparison technology described in the present invention, the comparison module includes an input buffer, an analog-to-digital converter, and a processor connected in sequence.

[0013] As a preferred solution of the remote dynamic current evaluation system based on AC / DC comparison technology described in the present invention, wherein: the input buffer is used to buffer the AC power signal input from the AC power grid to avoid errors caused by direct signal processing; the analog-to-digital converter is used to perform analog-to-digital conversion on the AC power signal to obtain multiple AC power indicator values ​​including voltage values ​​in the AC power signal; the processor is used to calculate and compare the acquired AC voltage value with a reference DC voltage to evaluate the AC power signal, and output the evaluation result to the control module.

[0014] As a preferred solution of the remote dynamic current evaluation system based on AC / DC comparison technology described in the present invention, the comparison module further includes a reference voltage generator for providing a reference DC voltage to the analog-to-digital converter as a reference for evaluating the AC input based on the AC / DC comparison technology.

[0015] As a preferred solution of the remote dynamic current evaluation system based on AC / DC comparison technology described in the present invention, wherein: the comparison module further includes a clock generator; the clock generator is configured to be communicatively coupled with the processor to provide a timing reference to the processor.

[0016] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the remote dynamic current evaluation method based on AC / DC comparison technology are implemented.

[0017] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the remote dynamic current evaluation method based on AC / DC comparison technology are implemented.

[0018] The beneficial effects of the present invention are as follows: through the AC / DC comparison technology, reference AC parameters can be dynamically generated and accurately compared with the converted DC output, avoiding the errors caused by the use of fixed AC parameters in traditional systems, and ensuring high-precision current calibration of the charging pile under various grid fluctuation conditions; the reference voltage value and sampling frequency can be dynamically adjusted according to the evaluation results, so as to flexibly respond to grid frequency, load changes and external interference, and ensure the efficient operation of the charging pile under complex conditions; the use of non-integer cycle sampling technology can improve the capture accuracy of AC signals and reduce sampling errors, especially when processing high-frequency or non-ideal AC signals, it shows better adaptability, further improving the overall performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0020] Figure 1 A schematic flow chart of a remote dynamic current evaluation method based on AC / DC comparison technology according to an embodiment of the present invention;

[0021] Figure 2A schematic diagram of the structure of a remote dynamic current evaluation system based on AC / DC comparison technology provided by the present invention;

[0022] Figure 3 A schematic diagram of the structure of a comparison module provided by the present invention;

[0023] Figure 4 A line chart showing the error rate of the non-integer period sampling method provided by the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1 This embodiment provides a remote dynamic current evaluation method based on AC / DC comparison technology, including:

[0030] S1: Initialize the reference DC voltage of the reference voltage generator;

[0031] Specifically, the control module first needs to determine the working status of one or more comparison modules connected to it, and ensure that all modules are started and ready; then, the control module communicates with the comparison module to synchronize the working status and parameters of each module to ensure the consistency within the system; finally, the control module sends instructions to the reference voltage generator of the comparison module to initialize the reference DC voltage value. This reference voltage value is usually set according to the specifications and requirements of the charging pile system and serves as a reference standard for subsequent comparison and evaluation.

[0032] S2: Collect current signals, perform analog-to-digital conversion on the AC signals, and obtain AC parameters;

[0033] Preferably, the AC signal, including voltage, current, frequency and other parameters, is collected in real time by a sensor connected to the AC power grid; the acquisition module collects the DC output voltage and current signals in real time by a sensor connected to the output end of the conversion module; the acquisition module calculates the output power based on the collected DC voltage and current signals so as to monitor and manage the charging process; the collected analog AC signal is converted into a digital signal for subsequent numerical calculation and comparative evaluation; it should be noted that the comparison module uses a non-integer cycle sampling method to sample the AC signal to improve sampling accuracy and adaptability. Non-integer cycle sampling dynamically adjusts the time interval of the sampling points so that each sampling cycle does not have to strictly follow the complete cycle of the signal, thereby avoiding sampling errors and frequency aliasing problems.

[0034] S3: Compare the DC power parameters with the reference AC power parameters to evaluate the quality of the DC output;

[0035] Furthermore, numerical calculations are performed on the AC signal after analog-to-digital conversion to extract AC parameters, such as voltage RMS, frequency, phase, etc. The comparison module compares the converted DC parameters with the reference AC parameters to evaluate the quality of the DC output. For example, the conversion efficiency and output stability of the conversion module can be evaluated by calculating the deviation between the DC voltage and the reference AC voltage.

[0036] S4: dynamically adjust the reference voltage value and sampling frequency according to the evaluation results;

[0037] Reference voltage adjustment: The control module dynamically adjusts the reference voltage value according to the evaluation results of the comparison module. For example, if the deviation between the DC voltage and the reference AC voltage is found to be too large, the reference voltage value can be appropriately adjusted to improve the accuracy of the evaluation results; Sampling frequency adjustment: The control module dynamically adjusts the sampling frequency according to the evaluation results of the comparison module and changes in the power grid environment. For example, if the power grid frequency changes, or the input signal contains higher frequency components, the sampling frequency can be appropriately increased to ensure that the complete characteristics of the signal can be captured.

[0038] In order to further improve the accuracy of the evaluation, steps S2-S5 are repeated to achieve real-time dynamic evaluation of the charging pile current to ensure the stability and safety of the charging process. At the same time, the evaluation results and related data are recorded and analyzed to optimize and maintain the charging pile system.

[0039] Example 2

[0040] Reference Figure 2-3 , which is the second embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: a remote dynamic current evaluation system based on AC / DC comparison technology is provided, including a conversion module, an acquisition module, a comparison module and a control module.

[0041] The currently widely used application specifications for electric vehicle charging piles use alternating current as the input power source, and most of them use three-phase alternating current as the standard input with a voltage of 380V. At the same time, there is a certain input voltage fluctuation due to the load conditions of the charging station and the region and time period of the power grid.

[0042] In a charging station with multiple charging piles, the processing of AC power from the power grid can be centralized conversion or distributed conversion; among them, the centralized conversion system converts the AC power from the AC power grid with a unified conversion device, and uniformly converts the AC power into DC power, and then transmits it to each charging pile through a DC bus; in contrast, the distributed conversion system is that each charging pile is equipped with an independent AC-DC converter, which directly converts the AC power provided by the power grid into DC power.

[0043] In actual implementation, for a centralized conversion device, the calibration system of the present technical solution can configure the various modules of the calibration system in the centralized conversion device to achieve centralized calibration; and for a charging system configured in a distributed conversion manner, the conversion module, comparison module and acquisition module of the calibration system of the present technical solution can be set in each of the distributed conversion settings; however, whether it is a centralized conversion device or a distributed conversion device, the comparison module is electrically connected to the conversion module and the acquisition module through a physical conductor and transmits data, and one or more of the comparison modules are communicated with a centrally arranged control module through a remote communication method, and the control module uniformly processes the calibration data from the centralized conversion device or the calibration data from one or more charging piles, and then sends a control instruction to one or more of the comparison modules.

[0044] The conversion module refers to a conversion device or equipment configured in an existing charging pile system.

[0045] Preferably, the input buffer is used to buffer the input signal to avoid errors caused by direct signal processing; optionally, the input buffer can be selected as OP27E, which is a high-precision operational amplifier commonly used in input buffering and high-precision measurement circuits. It has the characteristics of low noise, high open-loop gain, etc., and is suitable for use in precision AC / DC comparators;

[0046] Preferably, the analog-to-digital converter is used to convert the alternating current voltage U from the AC input signal ac Convert it into a digital signal with high precision, so as to further compare it with the AC-DC conversion effect of the conversion module configured by the charging station or charging pile; preferably, the analog-to-digital converter adopts the AD677 model, which has a 16-bit resolution, a self-calibration function, and a sampling frequency of 50Hz;

[0047] Preferably, the reference voltage generator is used to provide a reference voltage U for comparison. R , with high stability, preferably Fluke 732B or LTZ1000ACH; reference voltage U R After being input into the analog-to-digital converter, it acts as a reference voltage, which is used as a standard to accurately measure the collected AC signal. The analog-to-digital converter digitizes the collected AC signal and compares it with the input DC reference voltage to obtain the effective value, phase, frequency and other parameters of the AC voltage. This process does not directly convert AC to DC, but achieves traceability and calibration of AC voltage through comparison and calculation.

[0048] The analog-to-digital converter may introduce errors during the measurement process due to temperature changes, drift or other external factors; the reference voltage U R Another key function of the input to the analog-to-digital converter is to provide a high-stability reference so that the analog-to-digital converter can be self-calibrated to correct the errors caused by the device's own characteristics and ensure the accuracy of the measurement;

[0049] And, the reference voltage U R Used for retrospective measurement of AC voltage; reference voltage U R It is required to have very high stability and use the reference voltage U under multiple timings R Continuously record and make it traceable; at the same time, by R By inputting to the analog-to-digital converter, the system can ensure the accuracy and traceability of the measurement results during the measurement process, thereby improving the reliability and consistency of the overall measurement system;

[0050] Preferably, the processor is a DSP processor, and the optional model is the TI C2000 series; the processor processes the signal data collected from the reference converter, calculates the effective value, frequency, phase and other parameters of the AC voltage, and compares them with the DC reference voltage U of the reference voltage generator. R Make comparisons;

[0051] Preferably, an isolator is provided between the reference converter and the processor for electrical isolation of the signal to ensure measurement accuracy; optionally, the isolator is a magnetic isolator, and its optional model is ADuM5401;

[0052] Preferably, the clock generator provides an accurate and stable time reference to determine the reference sampling frequency of the reference converter, ensuring that the sampling process is evenly distributed and synchronized with the input signal; in the present comparison system, the clock generator can ensure the synchronous operation of the data sampling actions of the input buffer, the reference converter and further the external working modules, so that the continuity of the data flow and the consistency of the processing are guaranteed; in addition, the clock signal is also used to process the delay and error compensation between modules to ensure the accuracy of the measurement results.

[0053] In practical applications, the amplitude, frequency and waveform of the AC signal may change; by dynamically adjusting the reference voltage U R , can more flexibly adapt to different AC input signals.

[0054] Furthermore, when higher precision calibration is required, fine adjustment of the reference DC voltage helps to more accurately match the characteristics of the input AC signal and reduce errors caused by signal instability or nonlinear effects;

[0055] Preferably, the control module can adjust the reference DC voltage within a small range based on the following conditions:

[0056] (1) Changes in frequency, phase or voltage: If the input AC signal fluctuates in frequency, phase or voltage, the control module may detect these changes and determine that the existing reference DC voltage is no longer applicable to the current comparison conditions; in this case, the control module will adjust the reference DC voltage to adapt to the new AC parameters to ensure the accuracy of the AC / DC comparison;

[0057] (2) DC output evaluation deviation: When the comparison module compares the DC output with the reference AC power parameters, if it detects that the difference between the DC output and the reference AC power parameters exceeds the preset tolerance range (e.g., too large or too small), the control module will try to adjust the reference DC voltage to reduce the deviation and ensure the accuracy and stability of the DC output;

[0058] (3) Continuous deviation: If the comparison results show that the DC output continues to deviate from the reference AC parameters during multiple consecutive calibration processes, the control module will gradually adjust the reference DC voltage until the system returns to performance within the normal range;

[0059] (4) Temperature change: The reference DC voltage may be affected by changes in ambient temperature. If the system detects that the DC voltage fluctuates due to an increase or decrease in temperature, the control module will adjust the reference voltage value to compensate for the impact of temperature and maintain system stability and accuracy.

[0060] (5) Other external interferences, such as electromagnetic interference or mechanical vibration, may also cause signal instability. The control module responds to these external interferences by dynamically adjusting the reference voltage to ensure the accuracy of signal processing.

[0061] Furthermore, the control module further includes adjusting the sampling frequency of the analog-to-digital converter in the comparison module under the following working conditions:

[0062] Fluctuation of AC input signal frequency: If the frequency of the AC signal fluctuates or changes (such as from 50 Hz to 60 Hz or a non-standard frequency), the control module may need to adjust the sampling frequency of the analog-to-digital converter to match the new signal frequency;

[0063] High-bandwidth signal processing: If the input signal is detected to contain higher frequency components (such as harmonics or other high-frequency interference), the control module may increase the sampling frequency of the analog-to-digital converter to ensure that the higher frequency components are captured to avoid distortion and aliasing effects; conversely, if the input signal bandwidth is low and stable, the control module can reduce the sampling frequency to reduce the amount of data and processing load while still maintaining sufficient signal capture accuracy;

[0064] High-precision calibration scenarios: In scenarios where higher accuracy is required, the control module will increase the sampling frequency of the analog-to-digital converter to increase the density of sampling points, thereby ensuring more accurate AC and DC comparison results; for example, when calibrating critical electrical equipment, a higher sampling frequency may be required to achieve higher measurement accuracy; in scenarios where the system has lower accuracy requirements, the sampling frequency can be moderately reduced to reduce processing overhead, especially in calibration scenarios during non-critical periods or under light loads;

[0065] Adjustment based on noise or interference level: When the system detects external electromagnetic interference or large noise, the control module may appropriately increase the sampling frequency to improve the accuracy of signal acquisition and avoid the impact of noise on signal reconstruction;

[0066] Adjustment based on dynamic load changes: When the DC charging load changes (such as power fluctuations, load switching), the control module may need to increase the sampling frequency to capture transient changes and measure voltage and current changes more accurately, thereby ensuring that the system responds quickly to load fluctuations;

[0067] When the input AC signal is distorted or has harmonic distortion, the control module can increase the sampling frequency to better capture the nonlinear part of the signal, thereby improving the accuracy of signal processing and calibration; or when the input AC signal deviates from the standard sine wave (such as spikes or pulses), by increasing the sampling frequency, the system can more accurately capture these non-ideal waveform characteristics to ensure data integrity.

[0068] Example 3

[0069] Reference Figure 4 , which is the third embodiment of the present invention, provides a remote dynamic current evaluation system based on AC / DC comparison technology. This embodiment is based on the previous embodiment, and is different from the previous embodiment in that: the comparison module uses a non-integer sampling period sampling method to sample the AC power, aiming to improve the sampling accuracy and accurately reflect the actual characteristics of the AC signal; unlike the traditional integer period sampling, the non-integer period sampling dynamically adjusts the time interval of the sampling points so that each sampling period does not have to strictly follow the complete cycle of the signal; this method can effectively solve the sampling error and frequency aliasing problems caused by the mismatch between the signal frequency and the sampling frequency. The control module determines the sampling period S of the comparison module for the AC input of the AC power grid based on the following calculation formula:

[0070]

[0071] In the above formula, S0 is the period of the measured signal, λ is the number of complete periods of the measured signal in one sampling period; β is the random offset, the value range is [-1, 1], which represents the offset of non-integer periods, and is used to introduce random error compensation to avoid frequency aliasing and other phenomena; N is the number of sampling points required in one sampling period;

[0072] By adjusting the interval between sampling points, non-integer period sampling can avoid frequency drift and signal distortion, ensuring that the collected signal more accurately reflects the characteristics of the input AC signal; further, non-integer sampling periods provide a more flexible sampling method, allowing better signal coverage to be obtained by adjusting the sampling time without adding additional hardware, thereby improving the accuracy of data reconstruction; and, since the difference between the sampling frequency and the input signal frequency may cause aliasing, non-integer period sampling can avoid aliasing in sampling by dynamically adjusting the sampling time, thereby ensuring high-precision signal reconstruction.

[0073] In the data of 1,000 sets of verification tests conducted in the laboratory, the error rate of the data of AC parameters obtained by analyzing the above non-integer cycle sampling method is significantly lower than the data value obtained without using this method.

[0074] Example 4

[0075] Reference Figure 1-4 , is an embodiment of the present invention, and provides a main distribution network collaborative risk assessment system considering uncertainty, characterized in that it includes:

[0076] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0077] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0078] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0079] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logical function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A remote dynamic current evaluation method based on AC / DC comparison technology, characterized in that: include, Initializes a reference DC voltage of a reference voltage generator; Collect current signals, perform analog-to-digital conversion on AC signals, and obtain AC parameters; Compare DC parameters with reference AC parameters to assess the quality of DC output; According to the evaluation results, the reference voltage value and sampling frequency are dynamically adjusted.

2. The remote dynamic current evaluation method based on AC / DC comparison technology according to claim 1 is characterized in that: The collected current signals include the AC power signal of the AC power grid and the converted DC output voltage and current.

3. The remote dynamic current evaluation method based on AC / DC comparison technology according to claim 2 is characterized in that: The sampling method of the current signal adopts non-integer cycle sampling to improve the capture accuracy of the AC signal and reduce the sampling error.

4. A system using the remote dynamic current evaluation method based on AC / DC comparison technology as claimed in any one of claims 1 to 3, characterized in that: include: Conversion module, acquisition module, comparison module and control module; The control module is remotely communicatively connected to one or more of the comparison modules; The input end of the conversion module is connected to the AC power grid, and the output end is connected to the power load, and is configured to convert the AC power from the AC power grid into DC power and then output DC power to the power load; The acquisition module is electrically connected to the DC output terminal of the conversion module, and is configured to acquire the DC output terminal voltage U1 and current I1 of the conversion module, and calculate the output power; The comparison module is electrically connected to the AC power grid input terminal, and is communicatively connected to the conversion module and the acquisition module; The control module is configured to dynamically set the operating parameters of the comparison module based on the evaluation result of the comparison module, and the operating parameters of the comparison module include a reference voltage value and a sampling frequency.

5. The remote dynamic current evaluation system based on AC / DC comparison technology according to claim 4, characterized in that: The comparison module includes an input buffer, an analog-to-digital converter, and a processor which are connected in sequence.

6. The remote dynamic current evaluation system based on AC / DC comparison technology according to claim 5, characterized in that: The input buffer is used to buffer the AC power signal input from the AC power grid to avoid errors caused by direct signal processing; The analog-to-digital converter is used to perform analog-to-digital conversion on the AC signal to obtain multiple AC index values ​​including voltage value in the AC signal; The processor is used to calculate and compare the acquired AC voltage value with a reference DC voltage to evaluate the AC signal, and output the evaluation result to the control module.

7. The remote dynamic current evaluation system based on AC / DC comparison technology according to claim 6, characterized in that: The comparison module further includes a reference voltage generator for providing a reference DC voltage to the analog-to-digital converter as a reference for evaluating the AC input based on the AC-DC comparison technique.

8. The remote dynamic current evaluation system based on AC / DC comparison technology according to claim 7, characterized in that: The comparison module further includes a clock generator; the clock generator is configured to be communicatively coupled to the processor to provide a timing reference to the processor.

9. 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 the remote dynamic current evaluation method based on AC / DC comparison technology according to any one of claims 1 to 3 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the remote dynamic current evaluation method based on AC / DC comparison technology according to any one of claims 1 to 3 are implemented.

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