A high-current power detection device with closed-loop control function

Abstract

This utility model relates to the field of electrical energy detection technology, and proposes a high-current electrical energy detection device with closed-loop control function. The device includes: a programmable power source module, including an output drive unit for outputting current, voltage signals, and waveforms within a large current range; a standard measurement module connected to the output drive unit for detecting the current, voltage signals, and waveform parameters output by the output drive unit; a waveform sampling module connected to the output drive unit for sampling the waveform output by the output drive unit; a closed-loop control module bidirectionally connected to the programmable power source module and the waveform sampling module for adjusting the current, voltage signals, and waveforms; and an external device detection interface connected to the output terminal of the output drive unit for connecting different types of high-current metering devices. This utility model solves the problems of measurement error superposition, unstable output, and insufficient measurement range in traditional detection devices.

Description

Technical Field

[0001] This utility model relates to the field of electrical energy detection technology, and in particular to a high-current electrical energy detection device with closed-loop control function. Background Technology

[0002] With the development of new power systems and smart metering systems, higher requirements are being placed on the current detection range, measurement accuracy, and dynamic stability of power detection equipment in fields such as distribution networks and terminal electrical equipment. Existing power detection devices are mostly used in low-current detection fields below 100A, and are expanded by using standard energy meters with external current transformers, power sources with current boosters, etc., to meet the detection needs of a larger current range.

[0003] However, these traditional detection devices suffer from problems such as superimposed measurement errors, unstable output, and insufficient measurement range. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-current power detection device with closed-loop control function, solving the problem that traditional detection devices cannot meet the requirements of high precision, stability, and integration.

[0005] The solution adopted in this utility model is: a high-current power detection device with closed-loop control function, comprising:

[0006] The programmable power source module includes an output drive unit for outputting current, voltage signals, and waveforms over a wide current range.

[0007] A standard measurement module, connected to the output driving unit, is used to detect the current, voltage signals and waveform parameters output by the output driving unit;

[0008] A waveform sampling module, connected to the output driving unit, is used to sample the waveform output by the output driving unit;

[0009] The closed-loop control module is bidirectionally connected to the programmable power source module and the waveform sampling module, and is used to adjust the current, voltage signals and waveforms;

[0010] An external device detection interface is connected to the output terminal of the output drive unit and is used to connect different types of high-current metering devices.

[0011] Furthermore, the programmable power source module also includes:

[0012] The signal generation unit is used to generate preset AC current signals and AC voltage signals;

[0013] A digital power amplifier unit, connected to the signal generating unit, is used to amplify the AC current signal and the AC voltage signal output by the signal generating unit to the target output range;

[0014] The output drive unit is used to output AC current signals and AC voltage signals amplified to the target output range by the digital power amplifier unit.

[0015] Furthermore, the output drive unit is connected to the digital power amplifier unit, and the output current range is 0.1A to 600A, and the voltage range is 30V to 400V.

[0016] Furthermore, the standard measurement module includes a zero-flux transformer and a voltage sampler, which respectively collect current and voltage signals.

[0017] Furthermore, the waveform sampling module includes an ADC chip, which works in conjunction with the standard measurement module to acquire complete current, voltage signals, and waveform data.

[0018] Furthermore, the closed-loop control module includes:

[0019] An amplitude control feedback path is used to adjust the amplitude of the output current and voltage signals;

[0020] The waveform control feedback path is used to adjust the distortion of the output waveform.

[0021] Furthermore, the amplitude control feedback path includes an output signal stability detection unit, which is used to detect the fluctuation characteristics of the current and voltage signals and feed the detection results back to the programmable power source module, so that the programmable power source module adjusts the amplitude of the current and voltage signals.

[0022] Furthermore, the waveform control feedback path includes:

[0023] The harmonic analysis unit is used to detect harmonic components in the waveforms of the current and voltage signals.

[0024] The waveform distortion suppression unit, connected to the harmonic analysis unit, is used to optimize the waveforms of current and voltage signals based on the detection results.

[0025] Furthermore, the external device detection interface includes a detachable rail-mounted detection position, an intelligent measurement switch detection position, and an extended detection position.

[0026] Furthermore, the detachable rail-mounted detection position, the intelligent measurement switch detection position, and the extended detection position are all connected to the programmable power source module and the waveform sampling module through multiple parallel current output channels and independent waveform sampling channels, respectively, for simultaneous detection of multiple devices.

[0027] The beneficial effects of this utility model are as follows:

[0028] This invention improves the current output range of the power source and the current range of the standard meter by designing and modifying the electrical circuit of the detection position, thereby meeting the accuracy and stability requirements of the entire high-current energy metering equipment detection system. It allows for arbitrary adjustment of the power source output current from 0.1A to 600A and the phase between voltage and current within the range of 0-360°, with an active power error of less than 0.05%. This provides flexible, accurate, and stable power output for calibrating new high-current energy metering devices, and this output is unaffected by the load.

[0029] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0031] Figure 1 This is a schematic diagram of the device structure in an embodiment of this utility model;

[0032] Figure 2 This is a schematic diagram of the programmable power source module structure in an embodiment of this utility model.

[0033] In the diagram, 101 is the programmable power source module; 1011 is the signal generation unit; 1012 is the digital power amplifier unit; and 1013 is the output drive unit. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. 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 invention pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this utility model.

[0036] In recent years, new measuring equipment such as smart measuring switches, rail-mounted energy meters, and new energy smart monitoring terminals have been gradually introduced to the market. These devices have promoted the construction of new power systems, but their current range exceeds the range of general metering standards (greater than 100A). It can be seen that energy metering is being used more and more in high-voltage and high-current fields.

[0037] While traditional low-voltage traceability systems do not explicitly define the current range, a 100A current measurement range is sufficient for most applications. Therefore, the current measurement range of most standard instruments in standard systems is up to 100A. If the range is extended to larger currents, a large current transformer is added externally to the standard instrument, and an external current booster is added to the power source. However, such configurations will have problems:

[0038] In the mode of standard meter with external current transformer, the overall measurement accuracy is the combined error of the standard meter and the external current transformer. Changes in wiring impedance will directly affect the measurement results.

[0039] When a power source is in the mode of an external booster, the large output current is an open-loop output, which has two main problems. One is that the accuracy of the output current is the sum of the accuracy of the standard and the accuracy of the booster. Since there is no closed-loop feedback, the actual output current cannot be precisely controlled. The other problem is that the output current cannot be dynamically adjusted with the load changes at the terminal load side, so as to achieve dynamic and stable output of the source.

[0040] Therefore, the existing high-current power standard system is basically an indirect measurement system, which suffers from drawbacks such as the inability to directly measure power and the difficulty in determining the overall error. It cannot meet the further development needs of new measurement equipment, nor can it empower the power metering and traceability system of new power systems. There is an urgent need to develop high-current standards and improve the high-current metering and traceability system to meet diverse power consumption needs.

[0041] To achieve the above objectives, this embodiment proposes a high-current power detection device with closed-loop control function, such as... Figure 1 As shown, it includes: a programmable power source module 101, a standard measurement module, a waveform sampling module, a closed-loop control module, and an external device detection interface; wherein:

[0042] The programmable power source module 101 adopts an integrated power platform, including an output drive unit 1013. The output drive unit 1013 is an integrated high-current direct output structure, used to output current from 0.1A to 600A, voltage signals from 30V to 400V, and waveforms. For example... Figure 2As shown, the programmable power source module 101 also includes a signal generation unit 1011 and a digital power amplifier unit 1012. The signal generation unit 1011 is used to generate preset AC current signals and AC voltage signals. The digital power amplifier unit 1012 is connected to the signal generation unit 1011 and is used to amplify the AC current signals and AC voltage signals output by the signal generation unit 1011 to the target output range. The output drive unit 1013 is used to output the current signals and voltage signals amplified to the target output range by the digital power amplifier unit 1012.

[0043] In this embodiment, the signal generation unit 1011 uses an AD9959 chip as a DDS signal source to achieve precise and controllable output of frequency, amplitude, and phase. It can output an adjustable sine wave from 45Hz to 65Hz, with a frequency step accuracy of 0.001Hz, meeting the requirements of precision testing. The signal generation unit 1011 uses direct digital frequency synthesis technology to generate a preset AC current signal. It should be noted that the direct digital frequency synthesis technology used is existing technology and is not improved.

[0044] In this embodiment, the digital power amplifier unit 1012 adopts an LLC resonant full-bridge topology with a switching frequency of 200kHz to improve output efficiency and reduce waveform distortion. The output range supports 30V-400V and 0.1A-600A. Through synchronous rectification and closed-loop regulation, it achieves an efficiency of ≥85% and an output harmonic distortion of less than 0.2%.

[0045] This embodiment achieves direct current output and measurement from 0.1A to 600A, covering a wide range of application requirements and improving detection accuracy and dynamic response capabilities. The combination of a signal generation unit and a digital power amplifier unit provides a high-precision, high-stability signal source, enhancing the autonomy and flexibility of output control. Direct digital frequency synthesis technology enhances the frequency control accuracy and waveform programmability of the signal source, improving the signal generation quality of the system. The digital power amplifier unit employs high-frequency switching technology, improving output efficiency, reducing energy consumption and system heat loss, and simultaneously reducing waveform distortion.

[0046] The standard measurement module includes a zero flux structure with multi-tap compensation windings for wide-range measurement from 0.1A to 600A. The standard measurement module is electrically connected to the output drive unit 1013 and is used to detect the voltage, current signals and waveform parameters output by the output drive unit 1013.

[0047] In this embodiment, the standard measurement module incorporates a wide-range zero-flux current transformer and a high-precision voltage sampler.

[0048] The waveform sampling module is used to sample the waveform output by the output drive unit 1013 in real time. The waveform sampling module works in conjunction with the standard measurement module to obtain complete current, voltage signals and waveform data.

[0049] In this embodiment, the waveform sampling module uses a high-precision ADC chip for real-time data sampling.

[0050] The closed-loop control module is bidirectionally connected to the waveform sampling module and the programmable power source module 101, including amplitude control feedback path and waveform control feedback path, which respectively adjust the stability of the amplitude of the current and voltage signals output by the programmable power source module and the distortion of the output waveform. Specifically:

[0051] The amplitude control feedback path includes an output signal stability detection unit, used to detect the fluctuation characteristics of current and voltage signals, and feeds the detection results back to the programmable power source module 101, so that the programmable power source module 101 adjusts the stability of the amplitude of the output current and voltage signals. The waveform control feedback path includes a harmonic analysis unit and a waveform distortion suppression unit; the harmonic analysis unit is used to detect harmonic components in the output waveform; the waveform distortion suppression unit is connected to the harmonic analysis unit and is used to optimize the output waveform in real time based on the detection results.

[0052] In this embodiment, the output signal stability detection unit consists of a current sampling chip INA238 and a voltage sampling chip ADS1115, which collect the RMS values ​​and fluctuation ranges of the output current and voltage. The current sampling chip INA238 and the voltage sampling chip ADS1115 adjust the output amplitude in real time based on a PID algorithm to ensure that the output fluctuation is less than 0.05%. The chip has a built-in PID algorithm and performs the execution of the PID algorithm.

[0053] In this embodiment, the harmonic analysis unit uses the built-in FFT (Fast Fourier Transform) algorithm of the STM32H7 chip to detect the 2nd to 41st harmonic components in the waveform, with a sampling accuracy of 16 bits and a sampling rate of 20 kSps. The waveform distortion suppression unit uses a digital filter (IIR filter) with a built-in LMS adaptive filtering algorithm to dynamically adjust the filter coefficients, effectively suppressing harmonic distortion caused by variable load and optimizing the waveform in real time.

[0054] This embodiment employs closed-loop control to dynamically adjust the output signal amplitude and waveform quality, improving system stability and anti-interference capabilities. The output signal stability detection unit enables real-time monitoring and feedback adjustment of current or voltage output fluctuations, ensuring stability under long-term, high-current output conditions. The harmonic analysis unit and distortion suppression unit work together to optimize output waveform quality in real time, reducing the error impact of harmonics and improving measurement accuracy. The combination of Fast Fourier Transform (FFT) and adaptive filtering algorithms built into the chip and filter improves the efficiency and real-time performance of harmonic detection and waveform optimization, enhancing waveform quality under complex operating conditions.

[0055] The external device detection interface is connected to the output terminal of the output drive unit 1013 and is used to connect different types of high-current metering devices. The external device detection interface includes a detachable rail-mounted detection position, an intelligent measurement switch detection position, and an extended detection position. Each detection position is connected to the programmable power source module 101 and the waveform sampling module through multiple parallel current output channels and an independent waveform sampling channel, respectively, for simultaneous detection of multiple devices.

[0056] In this embodiment, each detection station is equipped with an independent circuit breaker and sampler, adopts a modular and detachable structure and multiple independent sampling, supports simultaneous connection and independent detection of 20 devices, and improves detection efficiency and equipment compatibility.

[0057] As a further implementation, the programmable power source module, standard measurement module, and closed-loop control module are housed together in a metal shielded housing to form an integrated structure. The external output uses short-path PCB board routing and direct output instead of external current boosters or external current transformers to reduce the wiring paths and electromagnetic interference sources inside the system, thereby improving the dynamic stability and waveform quality of the current output.

[0058] In this embodiment, the high-current energy detection device with closed-loop control function can meet the performance testing requirements of high-current energy metering equipment with a current range exceeding 100A, such as intelligent measuring switches, rail-mounted energy meters, and new energy intelligent monitoring terminals.

[0059] Specifically, the technical specifications of the device reach:

[0060] 1) Accuracy level: 0.05;

[0061] 2) Current output range: 0.1A-600A;

[0062] 3) Maximum output power: 1600VA;

[0063] 4) Voltage output range: 30V-400V;

[0064] 5) Maximum output power: 400VA;

[0065] 6) Current stability: ≤0.05% / 3 minutes;

[0066] 7) Frequency range: 45-65Hz;

[0067] 8) Phase adjustment range: ≤0.05%;

[0068] 9) Operating voltage range: 220V±15%.

[0069] The standard power source technical specifications meet the following requirements:

[0070] 1) Overall accuracy: ≤0.05%;

[0071] 2) Current stability: ≤0.05% / 3 minutes;

[0072] 3) Current output range: 0.1A-600A;

[0073] 4) Maximum output power: 1600VA;

[0074] 5) Voltage output range: 30V-400V;

[0075] 6) Maximum output power: 400VA;

[0076] 7) Frequency range: 45-65Hz;

[0077] 8) Frequency adjustment fineness: 0.001Hz;

[0078] 9) Waveform distortion: ≤0.2%;

[0079] 10) Phase adjustment fineness 0.01;

[0080] 11) Harmonic setting capability: 2 to 41st order, multiple harmonic combinations and superpositions are possible.

[0081] The technical specifications of the standard electricity meter meet the following requirements:

[0082] 1) Accuracy class: Active power 0.05, reactive power 0.5;

[0083] 2) Voltage range: 30V-480V;

[0084] 3) Current range: 0.1A-600A;

[0085] 4) Frequency range: 45Hz-65Hz;

[0086] 5) It can measure voltage, current, active power, reactive power, apparent power, and harmonics;

[0087] 6) It has the ability to analyze voltage and current harmonics from the 2nd to the 50th order;

[0088] 7) It has the capability to verify multiple types of electrical energy (fundamental wave energy, harmonic energy, and full wave energy);

[0089] 8) The power output pulse constant (r / kWh) can be set, with a maximum pulse output frequency of 50kHz;

[0090] 9) The power pulse is a TTL / CMOS compatible level output with an output current greater than 20mA;

[0091] 10) Equipped with an RS232 interface, it can communicate with a PC.

[0092] In addition, the time base is:

[0093] 1) Frequency: 500kHz (TTL level);

[0094] 2) Stability: 2×10⁻⁸ / d;

[0095] 3) Accuracy: 2×10-7.

[0096] The testing station is:

[0097] 1) Equipped with three-phase current columns, capable of handling a maximum current of 600A, and can be used to connect Rogowski coils;

[0098] 2) Equipped with a rail-mounted energy meter detection position, supporting simultaneous detection of up to 20 devices;

[0099] 3) Equipped with an intelligent measurement switch detection position, supporting simultaneous detection by up to 6 devices;

[0100] 4) It has an extended detection position for high-current metering equipment, which can be used for the detection extension of new high-current metering equipment;

[0101] 5) Equipped with independent wiring plugs and communication cables, it can flexibly support the testing of various types of high-current metering equipment;

[0102] The serial port server is:

[0103] 1) Number of RS485 serial ports: ≥24;

[0104] 2) Serial port baud rate: 2400~115200;

[0105] 3) Uplink interface: 100M network port (RJ45).

[0106] The system architecture is as follows:

[0107] 1) The system consists of the following main equipment components: a high-current range programmable power source, a high-current range standard energy meter, interface equipment, a high-current metering equipment testing frame, a high-precision time base frequency meter, existing measurement and control software, a computer, and related peripherals.

[0108] 2) The device's high current meets the requirements of direct output from the programmable power source, avoiding the need for external current boosters and external current transformers to achieve high current output and verification.

[0109] 3) The markings on the device comply with the relevant technical documents and clearly indicate the following information to the operator: model number, serial number, and voltage and current limits (or ranges) to ensure accuracy.

[0110] 4) The device has a neat and reasonable structure, correct wiring, and reliable connections; all displays and wiring should adopt a built-in design, and the appearance should be simple and clear.

[0111] 6) The device adopts an integrated structural design, is equipped with casters, and has a beautiful and elegant platform with exquisite craftsmanship and excellent workmanship.

[0112] In this embodiment, the working principle of the device is as follows:

[0113] During operation, the programmable power source module first generates preset voltage and current signals. Its output drive unit directly outputs these signals to a metering device connected to an external device detection interface. During the output process, the standard measurement module continuously monitors the voltage, current, and waveform parameters output by the output drive unit, while the waveform sampling module simultaneously samples the output waveform in real time. Together, they acquire complete voltage and current waveform data. The closed-loop control module receives data from the waveform sampling module, adjusts the amplitude stability of the output signal through amplitude control feedback, and adjusts the waveform distortion of the output signal through waveform control feedback. The adjustment commands are then sent back to the programmable power source module, forming a closed-loop control system.

[0114] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A high-current power detection device with closed-loop control function, characterized in that, include: The programmable power source module includes an output drive unit for outputting current, voltage signals, and waveforms over a wide current range. A standard measurement module, connected to the output driving unit, is used to detect the current, voltage signals and waveform parameters output by the output driving unit; A waveform sampling module, connected to the output driving unit, is used to sample the waveform output by the output driving unit; The closed-loop control module is bidirectionally connected to the programmable power source module and the waveform sampling module, and is used to adjust the current, voltage signals and waveforms; An external device detection interface is connected to the output terminal of the output drive unit and is used to connect different types of high-current metering devices.

2. The high-current power detection device with closed-loop control function as described in claim 1, characterized in that, The programmable power source module also includes: The signal generation unit is used to generate preset AC current signals and AC voltage signals; A digital power amplifier unit, connected to the signal generating unit, is used to amplify the AC current signal and the AC voltage signal output by the signal generating unit to the target output range; The output drive unit is used to output AC current signals and AC voltage signals amplified to the target output range by the digital power amplifier unit.

3. The high-current power detection device with closed-loop control function as described in claim 2, characterized in that, The output drive unit is connected to the digital power amplifier unit, and the output current range is 0.1A to 600A, and the voltage range is 30V to 400V.

4. A high-current power detection device with closed-loop control function as described in claim 1, characterized in that, The standard measurement module includes a zero-flux transformer and a voltage sampler, which collect current and voltage signals respectively.

5. A high-current power detection device with closed-loop control function as described in claim 1, characterized in that, The waveform sampling module includes an ADC chip, which works in conjunction with the standard measurement module to acquire complete current, voltage signals and waveform data.

6. A high-current power detection device with closed-loop control function as described in claim 1, characterized in that, The closed-loop control module includes: An amplitude control feedback path is used to adjust the amplitude of the output current and voltage signals; The waveform control feedback path is used to adjust the distortion of the output waveform.

7. A high-current power detection device with closed-loop control function as described in claim 6, characterized in that, The amplitude control feedback path includes an output signal stability detection unit, which is used to detect the fluctuation characteristics of the current and voltage signals and feed the detection results back to the programmable power source module, so that the programmable power source module adjusts the amplitude of the current and voltage signals.

8. A high-current power detection device with closed-loop control function as described in claim 6, characterized in that, The waveform control feedback path includes: The harmonic analysis unit is used to detect harmonic components in the waveforms of the current and voltage signals. The waveform distortion suppression unit, connected to the harmonic analysis unit, is used to optimize the waveforms of current and voltage signals based on the detection results.

9. A high-current power detection device with closed-loop control function as described in claim 1, characterized in that, The external device detection interface includes a detachable rail-mounted detection position, an intelligent measurement switch detection position, and an extended detection position.

10. A high-current power detection device with closed-loop control function as described in claim 9, characterized in that, The detachable rail-mounted detection position, the intelligent measurement switch detection position, and the extended detection position are all connected to the programmable power source module and the waveform sampling module through multiple parallel current output channels and independent waveform sampling channels, respectively, for simultaneous detection of multiple devices.

Images