Electric energy quality analyzer

Abstract

The utility model discloses an electric energy quality analyzer, which comprises a main sampling module, a standby sampling module and a high-frequency interference suppression module. And the main sampling module and the standby sampling module both adopt standardized slot design, so that quick plugging can be realized, and the flexibility and maintainability of the equipment are improved. The analyzer is compact in structure, integrates a high-precision sampling circuit and an embedded processing unit, and is used for collecting and processing signals. The high-frequency interference suppression module is located in a signal link, high-frequency noise is effectively filtered, and the signal quality is ensured. The beneficial effects are that high precision and strong anti-interference capability of signal acquisition are ensured. The equipment can visually display a harmonic histogram, a total harmonic distortion rate, a peak factor and inter-harmonic distribution through real-time analysis of electric energy quality parameters. The structural design is convenient to operate and maintain, is suitable for electric energy quality monitoring of a complex electric power system, and has remarkable technical advantages and market application potential.

Description

TECHNICAL FIELD

[0001] The utility model relates to the electric power field, concretely relates to a power quality analyzer. BACKGROUND

[0002] In the power system, the stability of power quality has important significance to guarantee the power grid safety and improve the power supply reliability. However, with the improvement of industrial automation degree and the wide application of power electronic equipment, the voltage, current fluctuation and harmonic problem in the power system are increasingly serious, which puts forward higher requirements on the performance of power quality analyzer.

[0003] The traditional power quality analyzer has certain limitations in modular design, anti-interference ability, signal acquisition precision and the like. The specific manifestations are as follows:

[0004] Low modular degree: the sampling module of the traditional power quality analyzer has high integration degree with the main device, when a certain module is damaged or needs to be upgraded, the maintenance and replacement are difficult, which affects the continuous operation of the device.

[0005] Insufficient anti-interference ability: in the complex electromagnetic environment, the traditional power quality analyzer is easily affected by high-frequency interference, which leads to signal distortion and affects the accuracy of analysis results.

[0006] Low signal acquisition precision: in the signal acquisition, conditioning and conversion process of the traditional power quality analyzer, due to the circuit design and technical limitations, it is difficult to realize high-precision and high-stability signal acquisition.

[0007] Poor human-computer interaction experience: the display and interaction system of the traditional power quality analyzer has single function, and the operation is complex, which is not conducive to the user to quickly obtain the power quality information.

[0008] In view of the above problems, it is necessary to study a power quality analyzer with high modular degree, strong anti-interference ability, high signal acquisition precision and good human-computer interaction experience. SUMMARY

[0009] To solve the above technical problems, the utility model provides a novel power quality analyzer, by adopting modular design, high-frequency interference suppression technology, high-precision sampling circuit and humanized display and interaction system, the above problems are effectively solved, and powerful support is provided for the monitoring and analysis of power quality of the power system.

[0010] The utility model is realized through the following technical schemes:

[0011] A power quality analyzer, comprising:

[0012] The main sampling module has a plurality of different range modules, each module is the same structure, and is plug-in connected to the power quality analyzer body through a standardized slot; the main sampling module is connected with the high-frequency interference suppression module to ensure the anti-interference performance of the signal;

[0013] The standby sampling module has the same structure, number and arrangement as the main sampling module, and corresponds to the range of the main sampling module one by one; when the main sampling module of a certain range is plugged into the power quality analyzer body, the standby sampling module of the same range is also plugged in and connected with the high-frequency interference suppression module;

[0014] The high-frequency interference suppression module is provided with a main channel and a standby channel, which are connected with the main sampling module and the standby sampling module respectively; the module receives and processes the sampling signal, and then transmits the signal to the signal conditioning module, and is connected with the embedded main control chip, and can control the switching of the main and standby channels through the embedded main control chip;

[0015] The signal conditioning module is used for conditioning the received signal, and transmitting the conditioned signal to the analog-to-digital conversion module;

[0016] The analog-to-digital conversion module converts the analog signal into a digital signal, and is connected with the embedded main control chip through an SPI interface, and transmits the digitized signal to the embedded main control chip for processing;

[0017] The embedded main control chip performs power quality analysis operation, and is connected with the data transmission module, and transmits the analysis result to the data display and interaction system through the data transmission module;

[0018] The data transmission module is used for receiving and transmitting data from the embedded main control chip, or transmitting instructions from the data display and interaction system;

[0019] The data display and interaction system includes a display screen and an input device, and is used for displaying the power quality analysis result and supporting the user to interact with the device.

[0020] The power quality analyzer is a comprehensive test equipment, mainly used for monitoring and analyzing voltage, current and related quality indicators in the power system. In the utility model, the main sampling module and the standby sampling module are connected with the power quality analyzer body through a standardized slot, which greatly improves the convenience of module replacement and maintenance. At the same time, the high-frequency interference suppression module is used to further ensure the stability and accuracy of signal transmission. Through the redundant design of the main and standby channels, the signal interruption problem caused by the failure of the sampling module is avoided.

[0021] In operation, the main sampling module and the backup sampling module respectively sample the voltage and current of the target power system synchronously, and the signals of the two are processed by the high-frequency interference suppression module in a split channel to ensure the signal quality, and then sent to the signal conditioning module for subsequent operation.

[0022] Further, the main sampling module includes a voltage transformer, a current transformer, a sampling circuit, and a sampling chip. The voltage transformer and the current transformer are connected to the sampling circuit, and the sampling circuit is connected to the sampling chip. The output end of the sampling circuit is connected to the input end of the high-frequency interference suppression module through a standard interface.

[0023] The core components of the main sampling module include a voltage transformer, a current transformer, a sampling circuit, and a sampling chip. Among them, the main role of the voltage transformer and the current transformer is to reduce the high-voltage or large-current signal to a range suitable for the sampling circuit to process. The sampling circuit contains a multi-stage amplification and filtering structure, which can accurately capture the waveform characteristics of the target signal and ensure that the frequency range of the signal meets the subsequent processing requirements.

[0024] The standard interface design of the sampling circuit supports plug-and-play functionality, which further enhances the anti-interference capability of the signal by connecting with the high-frequency interference suppression module.

[0025] Further, the high-frequency interference suppression module includes a differential amplifier and an active interference suppression circuit. The differential amplifier receives signals from the main sampling module and the backup sampling module, and the active interference suppression circuit processes the transmitted signals to suppress interference and outputs the processed signals to the signal conditioning module.

[0026] The high-frequency interference suppression module is composed of a differential amplifier and an active interference suppression circuit. The design of the differential amplifier not only enhances the differential signal but also suppresses the common-mode noise, especially suitable for signal processing in complex electromagnetic environments. The active interference suppression circuit adjusts the filtering parameters dynamically to adapt to different frequency noise interference requirements, thereby outputting high-quality signals for subsequent module processing. The module also connects an embedded host chip, which realizes intelligent switching between channels through the host chip, improving the reliability of the device.

[0027] Further, the signal conditioning module includes a filtering circuit, a gain control circuit, and an anti-interference circuit. The filtering circuit is connected to the output end of the high-frequency interference suppression module to filter out high-frequency noise. The gain control circuit is connected to the output end of the filtering circuit to adjust the gain of the signal according to the signal amplitude. The anti-interference circuit is connected to the output end of the gain control circuit to reduce external interference. The output signal is processed and transmitted to the input end of the analog-to-digital conversion module through a standard interface.

[0028] The signal conditioning module is composed of a filter circuit, a gain control circuit and an anti-interference circuit. These circuits cooperate with each other in function to ensure high-fidelity transmission of the signal: the filter circuit filters out high-frequency noise and retains the effective frequency components of the target signal through distributed parameter inductance and capacitance. The gain control circuit uses automatic gain adjustment technology to dynamically adapt to signal amplitude changes and improve the resolution capability of low-amplitude signals. The anti-interference circuit uses grounding isolation and shielding technology to reduce external environmental interference on the signal.

[0029] Further, the above-mentioned analog-to-digital conversion module uses a high-speed ADC chip and is connected with the embedded host chip through an SPI interface. The analog-to-digital conversion module converts the analog signal into a digital signal and transmits it to the embedded host chip.

[0030] The core of the analog-to-digital conversion module is a high-speed ADC chip, which realizes parallel conversion of high-precision signals through multi-channel design. The SPI interface ensures the timing synchronization and integrity of the signal during data transmission. The sampling rate of the ADC chip is adjustable, meeting the collection needs of signals of different frequencies. The digital signal converted by the analog-to-digital conversion will serve as the basis for data processing by the embedded host chip.

[0031] Further, the above-mentioned embedded host chip performs quality analysis operations, and transmits the analysis results to the data display and interaction system through a data transmission module. The embedded host chip and the data transmission module are connected through a standard interface.

[0032] The embedded host chip undertakes the core tasks of data processing, logic control and communication coordination. Its running main program contains the following functional modules: power quality analysis algorithm, data recording, storage management and communication protocol stack. During operation, the host chip extracts key indicators from the sampling signal, including harmonic content, phase angle, peak factor, etc., while marking or alarming abnormal data.

[0033] Further, the above-mentioned data transmission module is a local transmission module that transmits the analysis results of the embedded host chip to the data display and interaction system. The data transmission module connects the embedded host chip and the data display and interaction system through a standard interface. The data transmission module in the utility model is a local transmission, ensuring the safety and reliability of data transmission, and avoiding the delay or interference problems of wireless transmission.

[0034] Further, the above-mentioned data display and interaction system includes a display screen and an input device. The display screen is used to display the power quality analysis results, and the input device is used to input control instructions. The data display and interaction system is connected with the data transmission module through a standard interface.

[0035] The data display and interaction system is equipped with a high-definition display screen and a multifunctional input device. The display screen updates the displayed analysis results in real time through an embedded main control chip, and the input device supports parameter setting, mode switching, fault handling and other operations. The user interface design is intuitive and can present graphical analysis data according to different operation modes, including vector diagrams, waveform diagrams and harmonic spectrum diagrams.

[0036] Further, the signal conditioning module includes a built-in reference signal source, the output end of the reference signal source is connected with the input end of the anti-interference circuit, and the anti-interference circuit and the gain control circuit output a calibration signal to the input end of the analog-to-digital conversion module, and then the analog-to-digital conversion module outputs to the embedded main control chip, and the embedded main control chip calibrates to realize the automatic calibration function of the signal conditioning module.

[0037] The built-in reference signal source can generate a reference signal periodically, which is collected by the analog-to-digital conversion module after being conditioned by the anti-interference circuit and the gain control circuit, and is transmitted to the embedded main control chip. The main control chip compares the collected calibration data with the set reference value, adjusts the internal parameters of the signal conditioning module, and realizes the automatic calibration function.

[0038] Further, the embedded main control chip is connected with an environment monitoring module; the environment monitoring module includes a temperature and humidity sensor, a vibration sensor and a signal conditioning circuit including an operational amplifier and an RC filter; the data collected by the temperature and humidity sensor and the vibration sensor is transmitted to the embedded main control chip through the signal conditioning circuit.

[0039] The environment monitoring module expands the function of the device, which can collect and analyze the physical parameters such as temperature, humidity and vibration of the running environment in real time. After these data are preliminarily processed by the signal conditioning circuit, they are transmitted to the embedded main control chip, providing auxiliary information for device performance optimization. The design of the module effectively improves the reliability and accuracy of the power quality analyzer in complex operating environments.

[0040] The beneficial effects of the utility model lie in:

[0041] High modular design: the main sampling module and the backup sampling module are connected with the power quality analyzer main body through standardized slots, realizing quick replacement and maintenance of the modules, greatly reducing the fault handling time and maintenance cost of the device.

[0042] Strong anti-interference ability: through the design of the high-frequency interference suppression module, the anti-interference performance of the signal is effectively improved, ensuring the stability and accuracy of the signal in complex electromagnetic environments.

[0043] Redundant design of main and backup channels: the redundant design of the main sampling module and the backup sampling module avoids signal interruption caused by failure of a single module, improving the reliability and continuous operation ability of the device.

[0044] High signal acquisition accuracy: high-precision voltage transformers, current transformers, sampling circuits and sampling chips are used to ensure high-fidelity signal acquisition, providing accurate data basis for power quality analysis.

[0045] Advanced signal conditioning module: the signal conditioning module includes filtering, gain control and anti-interference circuit, effectively filtering out high-frequency noise, dynamically adjusting signal gain, reducing external interference, and ensuring high-quality signal output.

[0046] High-speed analog-to-digital conversion: high-speed ADC chips are used for analog-to-digital conversion, ensuring fast and accurate signal processing to meet real-time monitoring requirements.

[0047] Strong data processing capability: the embedded main control chip has high-efficiency data processing capability, capable of performing complex power quality analysis operations and extracting key power quality indicators in real time.

[0048] Safe and reliable data transmission: the data transmission module uses local transmission method to ensure the safety and reliability of data transmission, avoiding the delay or interference problems caused by wireless transmission.

[0049] Optimized user interaction experience: the data display and interaction system uses high-definition display screen and multifunctional input device to provide intuitive and easy-to-operate user interface, facilitating users to quickly obtain and analyze power quality information.

[0050] Environmental monitoring function: the environmental monitoring module can collect temperature, humidity, vibration and other parameters of the device running environment in real time, providing auxiliary information for device performance optimization and fault warning.

[0051] In summary, the power quality analyzer of the utility model has significant advantages in modular design, anti-interference capability, signal acquisition accuracy, data processing capability and user interaction experience, which can effectively improve the efficiency and accuracy of power system power quality monitoring and analysis, and has high practical value and market prospect. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 : the structure diagram of the utility model;

[0053] In the figure: 1-main acquisition module, 2-back-up acquisition module, 3-high-frequency interference suppression module, 4-signal conditioning module, 5-analog-to-digital conversion module, 6-embedded main control chip, 7-data transmission module, 8-data display and interaction module, 9-environmental monitoring module. DETAILED DESCRIPTION

[0054] The utility model will be further described below in combination with the drawings and specific embodiments:

[0055] Embodiment: As shown in the figure, a power quality analyzer comprises: Figure 1

[0056] A main sampling module 1, which has multiple modules of different range, each module is the same structure and can be connected to the main body of the power quality analyzer through standardized slots; the main sampling module 1 is connected to the high-frequency interference suppression module 3 to ensure the anti-interference performance of the signal;

[0057] A backup sampling module 2, which has the same structure, number and arrangement as the main sampling module 1, and corresponds to the range of the main sampling module 1; when the main sampling module 1 of a certain range is connected to the main body of the power quality analyzer, the backup sampling module 2 of the same range is also connected, and is connected to the high-frequency interference suppression module 3;

[0058] The high-frequency interference suppression module 3 has a main channel and a backup channel, which are connected to the main sampling module 1 and the backup sampling module 2 respectively; after receiving and processing the sampling signal, the module transmits the signal to the signal conditioning module 4, and is connected to the embedded main control chip 6, which can control the switching of the main and backup channels through the embedded main control chip 6;

[0059] The signal conditioning module 4 is used to condition the received signal and transmit the conditioned signal to the analog-to-digital conversion module 5;

[0060] The analog-to-digital conversion module 5 converts the analog signal to digital signal and connects to the embedded main control chip 6 through the SPI interface, and transmits the digitized signal to the embedded main control chip 6 for processing;

[0061] The embedded main control chip 6 performs power quality analysis operation and is connected to the data transmission module 7, which transmits the analysis results to the data display and interaction system 8 through the data transmission module;

[0062] The data transmission module 7 is used to receive and transmit data from the embedded main control chip 6, or transmit instructions from the data display and interaction system 8;

[0063] The data display and interaction system 8 includes a display screen and an input device, which is used to display the power quality analysis results and support user interaction with the device.

[0064] ​The power quality analyzer is a comprehensive test equipment, mainly used for monitoring and analyzing voltage, current and related quality indicators in power system. In the utility model, the main sampling module 1 and the backup sampling module 2 are connected with the power quality analyzer main body through the standardized slot, which greatly improves the convenience of module replacement and maintenance. At the same time, by using the high-frequency interference suppression module 3, the stability and accuracy of signal transmission are further ensured. Through the redundant design of main and backup channels, the signal interruption problem caused by the failure of sampling module is avoided.

[0065] In operation, the main sampling module 1 and the backup sampling module 2 respectively sample the voltage and current of the target power system synchronously, and the signals of the two are processed through the high-frequency interference suppression module 3 in different channels to ensure the signal quality, and then sent to the signal conditioning module 4 for subsequent operation.

[0066] The main body of the power quality analyzer adopts high-strength aluminum alloy shell, which has good anti-interference ability and heat dissipation performance. Each module is connected with the main body through the standardized slot, and industrial-grade connectors such as M12 connectors are used to ensure the contact stability and anti-interference performance. The core computing unit (embedded main control chip 6) of the power quality analyzer adopts ARM Cortex-M series processor, which has high-speed operation ability to ensure fast real-time processing of a large amount of data.

[0067] Further, the above-mentioned main sampling module 1 comprises a voltage transformer, a current transformer, a sampling circuit, and a sampling chip, the voltage transformer and the current transformer are connected with the sampling circuit, the sampling circuit is connected with the sampling chip, and the output end of the sampling circuit is connected with the input end of the high-frequency interference suppression module 3 through a standard interface.

[0068] The core components of the main sampling module 1 include voltage transformer, current transformer, sampling circuit and sampling chip. Among them, the main role of voltage transformer and current transformer is to reduce high voltage or large current signal to the range suitable for sampling circuit processing. The sampling circuit contains multi-stage amplification and filtering structure, which can accurately capture the waveform characteristics of the target signal and ensure that the frequency range of the signal meets the subsequent processing requirements.

[0069] The standard interface design of the sampling circuit supports plug and play function, which further enhances the anti-interference ability of the signal by connecting with the high-frequency interference suppression module 3.

[0070] The voltage transformer of the main sampling module 1 selects a differential isolation amplifier of TI (Texas Instruments) ISO1212 type, which can effectively suppress high-frequency noise in the power grid. The current transformer adopts a LEM HTFS 1000 series current transformer, which has high linearity and low distortion. The sampling circuit uses an Analog Devices AD623 precision instrument amplifier, which can provide high input impedance and reduce signal distortion. The sampling chip uses Texas Instruments ADS1115, which is a high-precision, low-noise analog-to-digital converter suitable for high-precision power quality monitoring.

[0071] Further, the high-frequency interference suppression module 3 includes a differential amplifier and an active interference suppression circuit, the differential amplifier receives signals from the main sampling module 1 and the backup sampling module 2, and the active interference suppression circuit processes the transmitted signals after interference suppression, and then outputs the processed signals to the signal conditioning module 4.

[0072] The high-frequency interference suppression module 3 is composed of a differential amplifier and an active interference suppression circuit. The design of the differential amplifier not only enhances the differential signal, but also suppresses the common-mode noise, especially suitable for signal processing in complex electromagnetic environment. The active interference suppression circuit adjusts the filter parameters dynamically to adapt to different frequency noise interference requirements, so as to output high-quality signals for subsequent module processing. The module is also connected to the embedded main control chip 6, which realizes intelligent switching between channels through the main control chip and improves the reliability of the device.

[0073] The differential amplifier uses Analog Devices AD8138, which has a wide operating bandwidth and a high common-mode rejection ratio (CMRR), suitable for signal processing in high-frequency noise environment. In the active interference suppression circuit, Maxim Integrated MAX2755 high-frequency filter and Linear Technology LTC6655 low-noise voltage reference source are used. These components can effectively reduce external electromagnetic interference and stabilize signal output.

[0074] Further, the signal conditioning module 4 includes a filter circuit, a gain control circuit and an anti-interference circuit, the filter circuit is connected to the output end of the high-frequency interference suppression module 3, used for filtering high-frequency noise; the gain control circuit is connected to the output end of the filter circuit, used for adjusting the gain of the signal according to the signal amplitude; the anti-interference circuit is connected to the output end of the gain control circuit, used for reducing external interference, and the output signal is processed and transmitted to the input end of the analog-to-digital conversion module 5 through the standard interface.

[0075] The signal conditioning module 4 is composed of filter circuits, gain control circuits and anti-interference circuits. These circuits cooperate with each other in function to ensure high-fidelity transmission of signals: the filter circuit filters out high-frequency noise and retains the effective frequency components of the target signal through distributed parameter inductance and capacitance. The gain control circuit uses automatic gain adjustment technology to dynamically adapt to signal amplitude changes and improve the resolution capability of low-amplitude signals. The anti-interference circuit uses grounding isolation and shielding technology to reduce external environmental interference on the signal.

[0076] The gain control circuit in the signal conditioning module 4 uses Analog Devices AD5292 digital adjustable gain amplifier, which supports precise gain adjustment and improves the dynamic range of the system. The anti-interference circuit uses STMicroelectronics STM32 series microcontroller, which has high anti-interference processing capability and can adjust the filter and gain control parameters in real time to ensure stable output of the signal.

[0077] Further, the above-mentioned analog-to-digital conversion module 5 uses a high-speed ADC chip and is connected to the embedded host chip 6 through an SPI interface. The analog-to-digital conversion module 5 converts analog signals into digital signals and transmits them to the embedded host chip 6.

[0078] The core of the analog-to-digital conversion module 5 is a high-speed ADC chip, which realizes parallel conversion of high-precision signals through multi-channel design. The SPI interface ensures the timing synchronization and integrity of the signal during data transmission. The sampling rate of the ADC chip is adjustable, meeting the sampling needs of signals of different frequencies. The digital signals converted by the analog-to-digital conversion module will serve as the basis for data processing by the embedded host chip 6.

[0079] The core part of the analog-to-digital conversion module 5 uses Texas Instruments ADS8320 series 16-bit low-power analog-to-digital converter (ADC) with a sampling rate of 1MSPS, supporting high-precision analog signal sampling, especially suitable for the precision requirements in power quality analysis. The high-speed SPI interface ensures fast signal transmission and effectively avoids data delay. This module has low power consumption, fast conversion speed and is suitable for long-term continuous operation.

[0080] Further, the above-mentioned embedded host chip 6 performs quality analysis operations and transmits the analysis results to the data display and interaction system 8 through the data transmission module 7. The embedded host chip 6 and the data transmission module 7 are connected through a standard interface.

[0081] The embedded master control chip 6 undertakes the core tasks of data processing, logic control and communication coordination. The main program running on it includes the following functional modules: power quality analysis algorithm, data recording, storage management and communication protocol stack. During operation, the master control chip extracts key indicators from the sampling signal, including harmonic content, phase angle, peak factor, etc., while marking or alarming abnormal data.

[0082] The embedded master control chip 6 uses NXP i.MX 6ULL series processor, which has a balance between high performance and low power consumption, suitable for complex power quality analysis tasks. The chip integrates ARM Cortex-A7 core, with high-speed computing and graphics processing capability. It supports multiple communication interfaces such as SPI, I2C, UART, etc. to adapt to the data exchange needs of each module in the system. The high algorithm processing capability of the master control chip makes it possible to analyze power quality indicators such as harmonics, peak factor, power factor, etc. in real time.

[0083] Further, the above-mentioned data transmission module 7 is a local transmission module that transmits the analysis results of the embedded master control chip 6 to the data display and interaction system 8. The data transmission module 7 connects the embedded master control chip 6 and the data display and interaction system 8 using standard interfaces. The data transmission module 7 in the utility model is local transmission, which ensures the safety and reliability of data transmission, and avoids the delay or interference problems of wireless transmission.

[0084] The core component of the data transmission module 7 uses MCP2515 CAN controller produced by Microchip Company, which transmits data through CAN Bus protocol, ensuring high reliability communication in complex electromagnetic environment of power system. This module can transmit data to the display and interaction system in real time, and receive control instructions from the system. For the interface part of data communication, the module design uses RS485 and USB standard interfaces to ensure the stability of local communication.

[0085] Further, the above-mentioned data display and interaction system 8 includes a display screen and an input device, the display screen is used for displaying power quality analysis results, the input device is used for inputting control instructions, and the data display and interaction system 8 is connected with the data transmission module 7 through standard interfaces.

[0086] The data display and interaction system 8 is equipped with a high-definition display screen and a multifunctional input device. The display screen updates the analysis results displayed in real time through the embedded master control chip 6, and the input device supports parameter setting, mode switching and fault handling operations. The user interface design is intuitive, which can present graphical analysis data according to different operation modes, including vector diagram, waveform diagram and harmonic spectrum diagram, etc.

[0087] The data display and interaction system uses a Sharp LQ104V1DG21 model TFT-LCD display screen, which has high resolution and fast response speed, allowing for clear presentation of real-time power quality analysis results. The input devices use a Keypad and Rotary Encoder knob, which employs an Alps Alpine precision knob adjuster, allowing users to accurately set analysis parameters and select display modes. The display system supports touch screen operation, allowing users to quickly navigate the interface and make configurations. The display and interaction system embeds a Raspberry Pi 4 as an auxiliary processing unit, enabling more flexible operation and user interaction experience.

[0088] Further, the signal conditioning module 4 comprises a built-in reference signal source, the output end of the reference signal source is connected with the input end of the anti-interference circuit, for generating a reference signal periodically, outputting a calibration signal to the input end of the analog-to-digital conversion module 5 through the anti-interference circuit and the gain control circuit, and then outputting to the embedded host chip 6, and calibrating by the embedded host chip 6 to realize the automatic calibration function of the signal conditioning module.

[0089] The built-in reference signal source can generate a reference signal periodically, which is collected by the analog-to-digital conversion module 5 and transmitted to the embedded host chip 6 after being conditioned by the anti-interference circuit and the gain control circuit. The host chip compares the collected calibration data with the set reference value, adjusts the internal parameters of the signal conditioning module, and realizes the automatic calibration function.

[0090] The reference signal source selects a precise reference voltage source of Analog Devices AD5791 series, which has extremely low noise and temperature coefficient, and can be used for periodic calibration of the signal conditioning module. The signal conversion in the calibration process is performed by the Analog Devices AD7280 full-differential analog-to-digital converter, which can accurately measure the difference between the calibration signal and the reference signal, and adjust the gain and filter settings by the embedded host chip to ensure the long-term stability and high-precision operation of the system.

[0091] Further, the embedded host chip 6 is connected with an environment monitoring module 9; the environment monitoring module 9 comprises a temperature and humidity sensor, a vibration sensor, and a signal conditioning circuit comprising an operational amplifier and an RC filter; the data collected by the temperature and humidity sensor and the vibration sensor is transmitted to the embedded host chip 6 through the signal conditioning circuit.

[0092] The environment monitoring module 9 expands the functions of the device, which can collect and analyze the temperature, humidity, vibration and other physical parameters of the running environment in real time. These data are preliminarily processed by the signal conditioning circuit and transmitted to the embedded host chip 6, providing auxiliary information for device performance optimization. The design of the module effectively improves the reliability and accuracy of the power quality analyzer in complex operating environments.

[0093] The temperature and humidity sensor in the environment monitoring module 9 adopts Sensirion SHT35, which has the characteristics of high precision and low power consumption, and can detect the temperature and humidity changes of the device running environment in real time. The vibration sensor uses AnalogDevices ADXL345 three-axis accelerometer, which has high sensitivity and can detect the micro vibration that may be generated during the operation of the device, avoiding system errors caused by vibration. The signal conditioning circuit part adopts Texas Instruments INA333 precision instrument amplifier, which effectively processes environmental data and transmits it to the master chip for the system to evaluate the running status of the device.

[0094] When working, the utility model includes the following interfaces:

[0095] 1. Basic parameter interface

[0096] Display content:

[0097] Rated voltage, rated current;

[0098] PT transformation ratio, CT transformation ratio;

[0099] Circuit running state diagram, including:

[0100] Line voltage: display three-phase line voltage (Uab, Ubc, Uca) ;

[0101] Phase voltage: display phase voltage (Ua, Ub, Uc).

[0102] Implementation:

[0103] Use color touch screen interface;

[0104] Dynamic update circuit state diagram, real-time reflect voltage and current running state.

[0105] Waveform diagram display interface

[0106] Display content:

[0107] Real-time voltage curve (three-phase Ua, Ub, Uc) ;

[0108] Real-time current curve (three-phase Ia, Ib, Ic).

[0109] Implementation:

[0110] Sample voltage, current signal and process through fast Fourier transform (FFT) ;

[0111] Graphical interface real-time waveform drawing.

[0112] Vector diagram display interface

[0113] Display content:

[0114] Voltage and current effective value of each phase;

[0115] Phase relationship vector diagram of voltage and current.

[0116] Implementation:

[0117] Use the vector data generation module to analyze the effective value and phase of three-phase voltage and current;

[0118] Real-time dynamic vector graphics.

[0119] Harmonic display interface

[0120] Display content:

[0121] Harmonic diagram of voltage and current of each phase (horizontal coordinate is harmonic number, vertical coordinate is harmonic content);

[0122] Total harmonic distortion (THD), total odd harmonic distortion, and total even harmonic distortion;

[0123] Peak factor (Crest Factor).

[0124] Implementation:

[0125] Sample data through FFT harmonic component calculation;

[0126] Draw the harmonic histogram, and calculate the total harmonic distortion and peak factor.

[0127] Interharmonic display interface

[0128] Display content:

[0129] Interharmonic distribution diagram;

[0130] Amplitude and frequency of each interharmonic component.

[0131] Implementation:

[0132] Based on non-integer FFT technology, analyze the interharmonic characteristics;

[0133] Real-time display of analysis results.

[0134] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A power quality analyzer, characterized in that, include: The main sampling module (1) has multiple modules with different ranges. Each module has the same structure and can be plugged into the main body of the power quality analyzer through standardized slots. The main sampling module (1) is connected to the high-frequency interference suppression module (3) to ensure the anti-interference performance of the signal. The backup sampling module (2) has the same structure, quantity and arrangement as the main sampling module (1) and corresponds one-to-one with the range of the main sampling module (1). When the main sampling module (1) of a certain range is plugged into the main body of the power quality analyzer, the backup sampling module (2) of the same range is also plugged in and connected to the high frequency interference suppression module (3). The high-frequency interference suppression module (3) is provided with a main channel and a backup channel, which are connected to the main sampling module (1) and the backup sampling module (2) respectively. After receiving and processing the sampling signal, the module transmits the signal to the signal conditioning module (4) and is connected to the embedded main control chip (6). It can control the switching of the main and backup channels through the embedded main control chip (6). The signal conditioning module (4) is used to condition the received signal and transmit the conditioned signal to the analog-to-digital conversion module (5). The analog-to-digital converter module (5) converts analog signals into digital signals and connects to the embedded main control chip (6) via the SPI interface to transmit digital signals to the embedded main control chip (6) for processing; The embedded main control chip (6) performs power quality analysis and is connected to the data transmission module (7). The analysis results are sent to the data display and interaction system (8) through the data transmission module. The data transmission module (7) is used to receive and transmit data from the embedded main control chip (6), or to transmit instructions from the data display and interaction system (8); The data display and interaction system (8) includes a display screen and input devices for displaying power quality analysis results and supporting user interaction with the device.

2. The power quality analyzer as described in claim 1, characterized in that: The main sampling module (1) includes a voltage transformer, a current transformer, a sampling circuit, and a sampling chip. The voltage transformer and the current transformer are connected to the sampling circuit, and the sampling circuit is connected to the sampling chip. The output of the sampling circuit is connected to the input of the high-frequency interference suppression module (3) through a standard interface.

3. The power quality analyzer as described in claim 1, characterized in that: The high-frequency interference suppression module (3) includes a differential amplifier and an active interference suppression circuit. The differential amplifier receives signals from the main sampling module (1) and the backup sampling module (2). The active interference suppression circuit performs interference suppression processing on the transmitted signals and outputs the processed signals to the signal conditioning module (4).

4. The power quality analyzer as described in claim 1, characterized in that: The signal conditioning module (4) includes a filter circuit, a gain control circuit, and an anti-interference circuit. The filter circuit is connected to the output of the high-frequency interference suppression module (3) and is used to filter out high-frequency noise. The gain control circuit is connected to the output of the filter circuit and is used to adjust the gain of the signal according to the signal amplitude. The anti-interference circuit is connected to the output of the gain control circuit and is used to reduce external interference. The output signal is processed and then transmitted to the input of the analog-to-digital conversion module (5) through a standard interface.

5. A power quality analyzer as described in claim 1, characterized in that: The analog-to-digital conversion module (5) uses a high-speed ADC chip and is connected to the embedded main control chip (6) through the SPI interface. The analog-to-digital conversion module (5) converts analog signals into digital signals and transmits them to the embedded main control chip (6).

6. The power quality analyzer as described in claim 1, characterized in that: The embedded main control chip (6) performs quality analysis operations and transmits the analysis results to the data display and interaction system (8) through the data transmission module (7). The embedded main control chip (6) and the data transmission module (7) are connected through a standard interface.

7. A power quality analyzer as described in claim 1, characterized in that: The data transmission module (7) is a local transmission module that transmits the analysis results of the embedded main control chip (6) to the data display and interaction system (8).

8. A power quality analyzer as described in claim 1, characterized in that: The data display and interaction system (8) includes a display screen and an input device. The display screen is used to display power quality analysis results, and the input device is used to input control commands. The data display and interaction system (8) is connected to the data transmission module (7) through a standard interface.

9. A power quality analyzer as described in claim 4, characterized in that: The signal conditioning module (4) includes a built-in reference signal source. The output end of the reference signal source is connected to the input end of the anti-interference circuit. It is used to periodically generate a reference signal. The calibration signal is output to the input end of the analog-to-digital conversion module (5) through the anti-interference circuit and the gain control circuit. Then, the analog-to-digital conversion module (5) outputs the signal to the embedded main control chip (6). The embedded main control chip (6) performs calibration to realize the automatic calibration function of the signal conditioning module.

10. A power quality analyzer as described in any one of claims 1-9, characterized in that: The embedded main control chip (6) is connected to an environmental monitoring module (9); the environmental monitoring module (9) includes a temperature and humidity sensor, a vibration sensor and a signal conditioning circuit including an operational amplifier and an RC filter; the data collected by the temperature and humidity sensor and the vibration sensor are transmitted to the embedded main control chip (6) through the signal conditioning circuit.

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