An electrical energy replicating device and method

Abstract

The application provides an electric energy reproduction device and method, which comprises an industrial computer, a signal generator, and a power amplifier.The industrial computer is used for reading and identifying a recording wave file, and analyzing and extracting recording wave data.The signal generator is connected with the industrial computer through an Ethernet port, and is used for receiving the recording wave data and outputting three-phase voltage analog signals and three-phase current analog signals.The power amplifier is connected with the signal generator, and is used for receiving the three-phase voltage analog signals and the three-phase current analog signals, and realizing reproduction output of three-phase voltage and three-phase current.The application can read and identify general format three-phase voltage and current recording wave files exchanged by a power system transient data, and continuously and highly accurately reproduce three-phase voltage and current signals, and solves the problem that recording wave files of a recording wave instrument are actually saved in sections, and multiple recording wave files are generated during continuous recording.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric energy reproduction, and particularly relates to an electric energy reproduction device and method. BACKGROUND

[0002] As a core part and basic gauge of electric energy measurement, the measurement accuracy of an electric energy meter is directly related to the precision of electric energy measurement, involves the economic benefits of a power system and a power user, and is of great significance to the safe, effective and reasonable operation of the power system and the electric power marketization. Due to the complex operating characteristics of various complex loads such as power impact, nonlinearity, frequent waveform change and randomness, many meters with similar performance in laboratory tests have different performances in the measurement of impact loads. This reflects the limitations in the design of existing electric energy meters, and also reflects the shortcomings of the existing electric energy meter detection means and traceability system.

[0003] The inventor finds that the electric energy meter designed based on the traditional steady-state sinusoidal power theory has been difficult to meet the requirements of accurate measurement under various complex load conditions. However, the field waveform or actual power load waveform has many complex operating characteristics such as power impact, nonlinearity, frequent waveform change and randomness, and is not completely periodic, and will change with the power grid and power load. When the electric energy meter fails, it is often difficult to reproduce the failure phenomenon because the existing power source cannot reproduce the field waveform, and the field waveform cannot be reproduced, so it is difficult to conduct in-depth research on the failure of the electric energy meter, which is not conducive to the improvement of the reliability of the electric energy meter. The recording wave file of the current wave recorder is actually saved in segments, and multiple recording wave files will be generated when continuous recording is performed. SUMMARY

[0004] In order to solve the above problems, the application provides an electric energy reproduction device and method. The application can read and recognize, splice the common format for transient data exchange (COMTRADE) three-phase voltage and current recording wave files of the power system transient data exchange, and continuously and accurately reproduce the three-phase voltage and current signals. The application solves the problem that the recording wave file of the current wave recorder is actually saved in segments, and multiple recording wave files will be generated when continuous recording is performed. The application uses high fitting point number signal generation technology based on Ethernet transmission and high-speed digital analog converter (DAC), uses high data volume transmission recording wave data of Ethernet, and combines high-speed DAC to realize high fitting point number signal output and high-precision reproduction of recording wave signals. The DAC does not need a post-filter, and solves the problems of high precision and high bandwidth of signal generation.

[0005] To achieve the above objectives, in a first aspect, the present invention provides an electrical energy reproduction device, which adopts the following technical solution:

[0006] An electrical energy reproduction device, comprising:

[0007] The industrial computer is used to read and identify waveform recording files and analyze and extract waveform data.

[0008] The signal generator is configured as a digital-to-analog converter and is connected to the industrial control computer via an Ethernet port; the signal generator is used to receive the recorded waveform data and output three-phase voltage analog signals and three-phase current analog signals.

[0009] A power amplifier is connected to the signal generator; the power amplifier is used to receive the three-phase voltage and the three-phase current analog signals, and to realize the reproduction output of the three-phase voltage and the three-phase current.

[0010] Furthermore, the industrial control computer runs industrial control software, which is configured as follows:

[0011] Select the waveform recording file;

[0012] Determine if it is a single waveform recording file;

[0013] When there is a single waveform file, the waveform file is read directly; when there are multiple waveform files, the time information in the waveform file is read, and it is determined whether the time is continuous. If the time is continuous, the waveform file index is generated according to the time, and then the waveform file is read.

[0014] Parse the file and extract waveform data.

[0015] Furthermore, the signal generator is equipped with a controller, a SPORT interface, and a conversion circuit connected in sequence.

[0016] Furthermore, the controller is connected to the first pulse input to receive the power pulses from the device under test. These pulses are compared with the power of the recorded waveform data calculated and accumulated by the controller using an internal dot product algorithm, and are used to verify the power error of the device under test. The controller is also connected to the second pulse output. The controller calculates and accumulates the power of the recorded waveform data using an internal dot product algorithm and outputs corresponding power pulses, which are used to verify the power error of the reproduction device when it is under test.

[0017] Furthermore, the conversion circuit is a six-way conversion circuit.

[0018] Furthermore, the power amplifier is divided into a voltage power amplifier and a current power amplifier.

[0019] Furthermore, the voltage amplifier includes a first resistor and a second resistor. When the op-amp outputs 0, the first and second resistors are positive power supply voltages. By adjusting the voltage division ratio of the first and second resistors, the voltage at the positive input pin of the op-amp's power supply is controlled to ensure that it does not exceed the op-amp's power supply range.

[0020] Furthermore, the voltage amplifier also includes a third resistor and a fourth resistor. When the op-amp outputs 0, the voltage across the third resistor and the fourth resistor is a negative power supply voltage. By adjusting the voltage division ratio of the third resistor and the fourth resistor, the voltage at the positive input pin of the op-amp power supply is controlled to ensure that it does not exceed the power supply range of the op-amp.

[0021] Furthermore, when the output is greater than 0, the voltage across the second resistor decreases and the voltage across the third resistor increases. The decrease in voltage across the second resistor is equal to the increase in voltage across the third resistor, and the maximum output voltage is the power supply voltage. When the output is less than 0, the voltage across the second resistor increases and the voltage across the third resistor increases. The increase in voltage across the second resistor is equal to the decrease in voltage across the third resistor, and the maximum output voltage is negative of the power supply voltage.

[0022] To achieve the above objectives, in a second aspect, the present invention also provides a method for electrical energy reproduction, employing the following technical solution:

[0023] An electrical energy reproduction method employs an electrical energy reproduction device as described in the first aspect, comprising:

[0024] The waveform recording files are analyzed and processed to extract waveform data information;

[0025] The processed waveform data is transmitted to the signal generator via the network port to complete the generation of analog signals from waveform data.

[0026] The analog signal is amplified to reproduce the three-phase voltage and three-phase current output.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention can read, identify, and splice COMTRADE format three-phase voltage and current waveform files, and continuously reproduce the three-phase voltage and current signals with high precision. It solves the problem that current waveform recorders actually save waveform files in segments, resulting in multiple waveform files during continuous waveform recording. It adopts a high-fitting-point signal generation technology based on Ethernet transmission and high-speed DAC. It uses Ethernet to transmit waveform data with high data volume, combined with a high-speed DAC, to achieve a high fitting-point number of signal output and high-precision reproduction of waveform signals. The DAC does not require a post-stage filter, solving the problem of high precision and high bandwidth in signal generation. Attached Figure Description

[0029] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0030] Figure 1 This is an overall structural diagram of Embodiment 1 of the present invention;

[0031] Figure 2 This is a block diagram of the industrial control computer system according to Embodiment 1 of the present invention;

[0032] Figure 3 This is a flowchart of the control software in Embodiment 1 of the present invention;

[0033] Figure 4 This is a block diagram of the signal generator in Embodiment 1 of the present invention;

[0034] Figure 5 This is a block diagram of the DAC conversion circuit according to Embodiment 1 of the present invention;

[0035] Figure 6 This is a block diagram of the power amplifier according to Embodiment 1 of the present invention;

[0036] Figure 7 This is a block diagram of the voltage power amplifier circuit of Embodiment 1 of the present invention;

[0037] Figure 8 This is a schematic diagram of the current power amplifier according to Embodiment 1 of the present invention. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0040] Example 1:

[0041] like Figure 1 As shown, this embodiment provides an electrical energy reproduction device, including:

[0042] The industrial computer is used to read and identify waveform recording files and analyze and extract waveform data.

[0043] The signal generator is configured as a digital-to-analog converter and is connected to the industrial control computer via an Ethernet port; the signal generator is used to receive the recorded waveform data and output three-phase voltage analog signals and three-phase current analog signals.

[0044] A power amplifier is connected to the signal generator; the power amplifier is used to receive the three-phase voltage and the three-phase current analog signals, and to realize the reproduction output of the three-phase voltage and the three-phase current.

[0045] like Figure 1 The diagram shown is a general system block diagram of this embodiment, including an industrial control computer, a signal generator, a power amplifier, a voltage output, and a current output. The industrial control computer is connected to the signal generator via an Ethernet port. The industrial control computer reads and identifies the waveform recording file, analyzes and extracts the waveform recording data, and transmits the waveform recording data to the signal generator via the Ethernet port. The signal generator is connected to the power amplifier, and the signal generator outputs six analog signals: three-phase voltage and current. The analog signals are amplified and output by the power amplifier. The power amplifier is connected to the voltage output, and the power amplifier receives the analog signals from the signal generator, performs a V / V conversion, and reproduces the voltage output of the waveform recording file. The power amplifier is connected to the current output, and the power amplifier receives the analog signals from the signal generator, performs a V / I conversion, and reproduces the current output of the waveform recording file.

[0046] like Figure 2 The diagram shows the system block diagram of the industrial control computer. Control software runs on the industrial control computer. The control software identifies and reads waveform recording files, performs analysis and processing on the waveform recording files, and extracts waveform data. The identified waveform recording software can be one to n, and theoretically, n can be any value. However, in practical use, the size of the waveform recording file cannot exceed the storage capacity of the industrial control computer. The industrial control computer of this invention has a storage capacity of 20G and is equipped with a USB interface, allowing for external expansion of storage capacity and flexible use. The waveform data extracted by the control software is transmitted to the signal generator via an Ethernet port.

[0047] like Figure 3 The diagram shown is a flowchart of the control software for the reproduction device. The specific steps are as follows:

[0048] S1. Start: The program begins its flow and executes step S2.

[0049] S2. Select the waveform recording file. The waveform recording file can be single or multiple and can be selected directly through the software. Proceed to step 3.

[0050] S3. Determine whether it is a single waveform recording file. If it is a single file, proceed to step S4. If it is multiple files, proceed to step 7. The subsequent program flow is determined based on whether the selected waveform recording file is a single file or multiple files.

[0051] S4. Read the waveform recording file. If only one waveform recording file is selected, read the waveform recording file directly. If there are multiple waveform recording files, read the waveform recording files in index order and proceed to step S5.

[0052] S5. Parse the file and extract waveform data. Parse the COMTRADE format waveform recording file, extract the waveform data of the voltage and current channels in the waveform recording file, and transmit them to the signal generator according to the corresponding channel number. Then execute step S6.

[0053] S6. Waveform data is transmitted via the network port, and recorded waveform data is transmitted via the network port; the COMTRADE format recorded waveform file is parsed, the recorded waveform data of the voltage and current channels in the recorded waveform file is extracted, and transmitted to the signal generator according to the corresponding channel number, and step S10 is executed.

[0054] S7. Read the time information in the waveform recording file, parse the waveform recording file in COMTRADE format, and obtain the time information of each waveform recording file. This time information includes the time record of the first sampling point and the time record of the last sampling point of the waveform recording file. Execute step S8.

[0055] S8. Time Continuity Judgment: Determine if the time is continuous. If the time is continuous, proceed to step S9. After obtaining the time information in step 7, determine whether all waveform recording files are recorded continuously based on their time information. This is because current waveform recorders save data in segments based on duration (some save every 10 minutes, some every 18 minutes), and do not support long-term continuous waveform recording saved to a single file. Therefore, it is necessary to concatenate the waveform recording files saved separately by the recorder, sort the multiple files according to time order, and generate a corresponding sorting index to facilitate the identification and reading of waveform data in the waveform recording files according to time order in subsequent step S5. If the time is not continuous, the selected waveform recording files cannot be concatenated, and step S2 is executed to reselect waveform recording files.

[0056] S9. Generate the waveform recording file index order according to time. According to the waveform recording file time information obtained in step S7, sort each waveform recording file according to the time order and generate a sorting index to facilitate step S4 to read the waveform recording file according to the waveform recording index order and execute step S4.

[0057] S10, End. Electrical energy reproduction complete.

[0058] like Figure 4 As shown, the signal generator based on high-precision signal generation technology using a high-speed DAC: simply put, it receives high-volume waveform recording data from an industrial control computer, first stores the waveform recording data in memory, and then outputs the waveform recording data to the DAC through the SPORT's DMA channel. It uses a high-fitting-point, high-resolution digital-to-analog conversion, eliminating the need for filters, to achieve high-precision, low-distortion signal generation.

[0059] The DSP controller is connected to an Ethernet port to receive waveform data from the recorded waveform file sent by the industrial control computer. The DSP controller is also connected to one pulse input channel to receive the energy pulses from the device under test being verified by the reproduction device. These pulses are compared with the energy of the recorded waveform data calculated and accumulated by the DSP controller using its internal dot product algorithm, used to verify the energy error of the device under test. The DSP controller is also connected to one pulse output channel. The DSP controller calculates and accumulates the energy of the recorded waveform data using its internal dot product algorithm and outputs corresponding energy pulses, used by the standard device to verify the energy error of the reproduction device when it is being tested. The DSP controller is connected to SPOR... The T-interface is connected. The SPORT interface is the data output interface of the DSP controller. Waveform data from the DSP controller is transmitted at high speed to the DAC via the SPORT's DMA channel to complete digital-to-analog conversion. The SPORT interface is connected to a six-channel DAC conversion circuit. Waveform data from the six signals is transmitted at high speed to the DAC via the SPORT's DMA channel to complete digital-to-analog conversion for the six signals. The six-channel DAC conversion circuit is connected to a voltage signal output. Through analog-to-digital conversion, three of the six DAC conversion circuits output voltage signals. The six-channel DAC conversion circuit is also connected to a voltage signal output. Through analog-to-digital conversion, three of the six DAC conversion circuits output current signals.

[0060] In this implementation, the signal generator adopts a high-fitting point design of 10,000 points per cycle (50Hz) for each signal. The subsequent required filters are small, which can reduce the size, increase the bandwidth, and reduce the signal distortion. Therefore, the transmission rate from the industrial control computer to the signal generator needs to be greater than the rate at which the signal generator fits the waveform data. Each signal of the signal generator has 10,000 points per cycle, and the digital-to-analog conversion uses an 18-bit DAC. In order to facilitate data alignment, it needs to occupy 24 bits of transmission bandwidth (3 bytes). Therefore, the waveform data rate of each channel is 50*10000 / s*24bit=12Mb / s. The transmission rate of waveform data of six signals is 12Mb / s*6=72Mb / s. General transmission interfaces cannot handle such a large data throughput. Therefore, this invention uses a 100M Ethernet port as the communication interface between the industrial control computer and the signal generator.

[0061] In this implementation, the DSP controller uses the BF609, which has three synchronous serial ports (SPORT). The SPORT interface supports SPI communication mode, and each SPORT interface supports two data output ports, for a total of six data output interfaces, corresponding to the generation of three-phase voltage and three-phase current signals. These six signals ensure that each data signal has a dedicated data output interface, maximizing the data output communication rate, improving the transmission efficiency of the SPORT interface and DAC interface, and reducing communication errors and bit errors. It also features a fully integrated DMA controller, supporting DMA transfer with on-chip and off-chip memory and peripherals, facilitating high-speed read and write of external DDR2 memory. This is especially important for accessing waveform data files, which requires a large data throughput. For example, the waveform data receiving rate is 72Mb / s, and the data output rate for each signal is 12Mb / s.

[0062] In this embodiment, the ADC uses ADI's DAC with an effective resolution of 18 bits, an integral nonlinearity of 2 ppm (parts per million), a resolution of 4 ppm, a long-term linear stability of 0.05 LSB (i.e., 0.19 ppm), an output setup time of 1 µS, and a maximum communication rate of 35 MHz. It features high linearity, high resolution, and fast communication speed. All six DACs use ADI's AD5781 for signal generation.

[0063] The three DSP controllers have three sport interfaces: sport0, sport1, and sport2. Each sport interface can be divided into two half sport interfaces, which can communicate separately. Taking sport0 as an example, it is divided into sport0_0 and sport0_1.

[0064] like Figure 5 The diagram shows a block diagram of a six-channel DAC conversion circuit. The SPI interface of each DAC is connected to the DSP controller's sport interface. The waveform data output from the DSP controller controls the DAC to complete the digital-to-analog conversion. The reference reference is connected to the DAC to provide a reference signal. The DAC is connected to the signal output to output the analog signal from the digital-to-analog conversion.

[0065] like Figure 6 As shown, the power amplifier in this embodiment is divided into a voltage power amplifier and a current power amplifier. The voltage power amplifier includes three voltage power amplifiers to achieve three-phase voltage output, and the three-phase current power amplifier includes three-phase current power amplifiers to achieve three-phase current output.

[0066] like Figure 7As shown, the operational amplifier used is ADI's ADHV4702, with a supply range up to ±110V, a typical open-loop gain of 170dB, a typical slew rate of 74V / µs, an input voltage offset drift of 2µV / ℃, a typical bandwidth of 10MHz, and a typical input voltage noise of [missing value]. It features a wide voltage range, high open-loop gain, high slew rate, low offset, high bandwidth, and low noise, making it suitable for use as a high-precision, high-bandwidth voltage power amplifier.

[0067] In this embodiment, a 220VAC voltage output is required. The op-amp's power supply is 24-220V, so it cannot directly output 220VAC. A bootstrap circuit using a MOSFET is used to increase the op-amp's output range, as shown in the voltage amplifier circuit block diagram. By connecting a MOSFET in series with the op-amp's power supply, the power supply range of the op-amp is increased, allowing the op-amp's power supply to float with the output, thereby increasing the op-amp's output range. The circuit architecture includes a pair of complementary discrete transistors and a resistive bias network. The emitter of NPN transistor Q1 (or the source pin of an N-channel MOSFET) provides VCC, and the emitter of PNP transistor Q2 (or the source pin of a P-channel MOSFET) serves as VEE. The voltage of the switching power supply is divided by a resistor network R1, R2, R3, and R4 as the bias voltage for Q1 and Q2, ensuring the required power supply voltage appears on the amplifier's power supply pins. The signal is input to the operational amplifier through resistor R7 and fed back to the output through feedback resistors R5 and R6. The output value is set by adjusting the ratio of R5 and R6.

[0068] The specific working process of the circuit is as follows:

[0069] When the op-amp outputs 0, the voltage across the first resistor R1 and the second resistor R2 is the positive power supply voltage. Q1 is connected as a follower. The positive voltage of the op-amp should be less than the voltage across the second resistor R2. Therefore, the voltage of the positive input pin of the op-amp power supply can be controlled by adjusting the voltage division ratio of the first resistor R1 and the second resistor R2 to ensure that it does not exceed the power supply range of the op-amp. This can be achieved through actual debugging.

[0070] Similarly, when the op-amp output is 0, the voltage across the third resistor R3 and the fourth resistor R4 is a negative power supply voltage. Q2 is connected as a follower. The negative voltage of the op-amp should be less than the voltage across the third resistor R3. Therefore, the voltage of the positive input pin of the op-amp power supply can be controlled by adjusting the voltage division ratio of the third resistor R3 and the fourth resistor R4 to ensure that it does not exceed the power supply range of the op-amp. This can be achieved through actual debugging.

[0071] When the op-amp output is not 0, for example, when the output is greater than 0, the circuit block diagram shows that compared to when the op-amp output is 0, the voltage across the second resistor R2 decreases, and the voltage across the third resistor R3 increases. The decrease in voltage across the second resistor R2 is approximately equal to the increase in voltage across the third resistor R3. The maximum output voltage can approach the positive power supply voltage, thus expanding the positive output range of the op-amp. Similarly, for example, when the output is less than 0, the circuit block diagram shows that compared to when the op-amp output is 0, the voltage across the second resistor R2 increases, and the voltage across the third resistor R3 increases. The increase in voltage across the second resistor R2 is approximately equal to the decrease in voltage across the third resistor R3. The maximum output voltage can approach the negative power supply voltage, thus expanding the negative output range of the op-amp.

[0072] In summary, by simply adjusting the voltage division ratios of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 according to the power supply voltage, it is possible to ensure that the power supply of the op-amp remains within its operating range throughout the entire output range of the op-amp, while simultaneously expanding the output voltage of the op-amp.

[0073] like Figure 8 As shown, in this embodiment, the signal is input to the OPA541 operational amplifier, and the output current value is controlled by I / V conversion feedback to realize the V / I conversion of the output signal and complete the power amplification output of the current. The OPA541 is powered by an external switching power supply.

[0074] The OPA541 has a maximum output current of 10A and a typical output bandwidth of 2MHz. It features wide bandwidth and high current output, making it suitable as a high-precision, wide-bandwidth current amplifier.

[0075] The I / V conversion feedback uses a high-precision platinum resistance thermometer as the feedback resistor, with a temperature drift of 1ppm.

[0076] In this embodiment, a three-phase voltage output is provided, which is connected to a power amplifier to output the reproduced three-phase voltage.

[0077] In this implementation, a three-phase current output is connected to a power amplifier to output the reproduced three-phase current.

[0078] This embodiment is a Class D power amplifier for a high-precision standard source based on waveform predistortion technology:

[0079] The control software can read, recognize, and splice COMTRADE format three-phase voltage and current waveform files, and continuously reproduce the three-phase voltage and current signals with high precision. This solves the problem that the waveform files of current waveform recorders are actually saved in segments, resulting in multiple waveform files during continuous waveform recording.

[0080] This invention employs a high-fitting-point signal generation technology based on Ethernet transmission and a high-speed DAC. It uses Ethernet to transmit waveform data in a high-volume manner, combined with a high-speed DAC, to achieve a high fitting-point count in the signal output and reproduce the waveform signal. The DAC does not require a subsequent filter, thus solving the problems of high precision and high bandwidth in signal generation.

[0081] This embodiment can read, recognize, and splice COMTRADE format three-phase voltage and current waveform files, and continuously reproduce the three-phase voltage and current signals with high precision. This solves the problem that current waveform recorders actually save waveform files in segments, resulting in multiple waveform files during continuous waveform recording. It adopts a high-fitting-point signal generation technology based on Ethernet transmission and high-speed DAC. It uses Ethernet to transmit waveform data with high data volume, combined with a high-speed DAC, to achieve a high fitting-point number of signal output and high-precision reproduction of waveform signals. The DAC does not require a post-stage filter, solving the problem of high precision and high bandwidth in signal generation.

[0082] Example 2:

[0083] This embodiment of a power reproduction method employs the power reproduction device described in Embodiment 1, including:

[0084] The waveform recording files are analyzed and processed to extract waveform data information;

[0085] The processed waveform data is transmitted to the signal generator via the network port to complete the generation of analog signals from waveform data.

[0086] The analog signal is amplified to reproduce the three-phase voltage and three-phase current output.

[0087] This embodiment proposes a high-precision power reproduction method. First, the COMTRADE format waveform file is analyzed and processed to extract waveform data and other information. Second, the processed waveform data is transmitted to a signal generator through a network port to generate an analog signal. Finally, the analog signal is passed through a high-precision, high-bandwidth power amplifier to realize the reproduction output of three-phase voltage and current, thus completing the high-precision power reproduction.

[0088] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. An electrical energy reproduction device, characterized in that, include: The industrial computer is used to read and identify waveform recording files and analyze and extract waveform data. The signal generator is configured as a digital-to-analog converter and is connected to the industrial control computer via an Ethernet port; the signal generator is used to receive the recorded waveform data and output three-phase voltage analog signals and three-phase current analog signals. The signal generator is equipped with a controller, a SPORT interface and a conversion circuit connected in sequence. The controller is connected to the first pulse input channel to receive the power pulses from the device under test. The power pulses are compared with the power pulses calculated and accumulated from the recorded waveform data by the controller using an internal dot product algorithm, which is used to verify the power error of the device under test. The controller is also connected to the second pulse output channel. The controller calculates and accumulates the power pulses from the recorded waveform data using an internal dot product algorithm, and outputs corresponding power pulses, which are used to verify the power error of the reproduction device when it is under test. A power amplifier is connected to the signal generator; the power amplifier is used to receive the analog signals of the three-phase voltage and the three-phase current, and to realize the reproduced output of the three-phase voltage and the three-phase current. The power amplifier is divided into a voltage power amplifier and a current power amplifier. The voltage power amplifier includes a first resistor and a second resistor. When the op-amp outputs 0, the voltage across the first resistor and the second resistor is a positive power supply voltage. By adjusting the voltage division ratio of the first resistor and the second resistor, the voltage at the positive input pin of the op-amp power supply is controlled to ensure that it does not exceed the power supply range of the op-amp. The voltage amplifier also includes a third resistor and a fourth resistor. When the op-amp outputs 0, the voltage across the third resistor and the fourth resistor is a negative power supply voltage. By adjusting the voltage division ratio of the third resistor and the fourth resistor, the voltage at the positive input pin of the op-amp power supply is controlled to ensure that it does not exceed the power supply range of the op-amp. When the output is greater than 0, the voltage across the second resistor decreases and the voltage across the third resistor increases. The decrease in voltage across the second resistor is equal to the increase in voltage across the third resistor, and the maximum output voltage is the power supply voltage. When the output is less than 0, the voltage across the second resistor increases and the voltage across the third resistor increases. The increase in voltage across the second resistor is equal to the decrease in voltage across the third resistor, and the maximum output voltage is the negative power supply voltage.

2. The electrical energy reproduction device as described in claim 1, characterized in that, The industrial control computer runs industrial control software, which is configured as follows: Select the waveform recording file; Determine if it is a single waveform recording file; When there is a single waveform file, the waveform file is read directly; when there are multiple waveform files, the time information in the waveform file is read, and it is determined whether the time is continuous. If the time is continuous, the waveform file index is generated according to the time, and then the waveform file is read. Parse the file and extract waveform data.

3. The electrical energy reproduction device as described in claim 1, characterized in that, The conversion circuit is a six-channel conversion circuit.

4. A method for reproducing electrical energy, characterized in that, The device employing the power reproduction apparatus as described in any one of claims 1-3 includes: The waveform recording files are analyzed and processed to extract waveform data information; The processed waveform data is transmitted to the signal generator via the network port to complete the generation of analog signals from waveform data. The analog signal is amplified to reproduce the three-phase voltage and three-phase current output.

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