A power quality monitoring device based on DSP

Abstract

The application discloses a power quality monitoring device based on DSP, comprising a data acquisition unit, a signal conditioning unit, a multi-channel data processing unit, a DSP control unit, a power supply loop control unit and a communication unit; the design of the signal conditioning unit fully considers the complexity of power grid signals and noise interference problems; through comprehensive use of a double operational amplifier noise reduction circuit, a reference bias circuit and a low-pass filter circuit, the device can effectively reduce noise and improve the signal-to-noise ratio and purity of signals; the introduction of the multi-channel data processing unit enables the device to efficiently process a large amount of power grid data, thereby greatly improving the speed and efficiency of data processing; as a core component of the device, the DSP control unit not only has strong data processing capability, but also has excellent coordination and control capability, and realizes real-time monitoring and fault early warning of power quality.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power quality monitoring, and particularly relates to a power quality monitoring device based on DSP. BACKGROUND

[0002] In the field of power systems, power quality is an important indicator for measuring the stability and reliability of power supply. It covers multiple aspects such as voltage quality, current quality, power supply quality and power consumption quality, and is directly related to the safe operation of the power grid and the normal work of various power equipment. However, with the continuous development and complication of the power system, power quality problems have become increasingly prominent, becoming one of the key factors restricting the improvement of the efficiency of the power system.

[0003] However, in the process of power quality monitoring, on the one hand, the voltage and current signals in the power grid often contain a large amount of noise and interference, which need to be effectively signal-conditioned and filtered to improve the signal-to-noise ratio and processing accuracy. On the other hand, due to the complexity and dynamics of the power grid, efficient data processing algorithms and parallel processing mechanisms need to be designed to realize real-time processing and analysis of a large amount of data. In addition, the existing power quality monitoring devices often have the problems of large amount of calculation and slow processing speed in data processing and analysis, which are difficult to meet the application scenarios with high requirements for real-time and accuracy. SUMMARY

[0004] The technical problem to be solved by the application is that the existing power quality monitoring devices often have the problems of large amount of calculation and slow processing speed in data processing and analysis, which are difficult to meet the application scenarios with high requirements for real-time and accuracy. The purpose is to provide a power quality monitoring device based on DSP, which can realize real-time and accurate acquisition of voltage and current signals of multiple key nodes in the power grid through the setting of the data acquisition unit, and the design of the signal conditioning unit fully considers the complexity and noise interference of the power grid signals. Through the comprehensive use of the double operational amplifier noise reduction circuit, the reference bias circuit and the low-pass filter circuit, the device can effectively reduce noise and improve the signal-to-noise ratio and purity of the signals. The introduction of the multi-channel data processing unit enables the device to efficiently process a large amount of power grid data, thereby greatly improving the speed and efficiency of data processing. The DSP control unit, as the core component of the device, not only has strong data processing capability, but also has excellent coordination and control capability, realizing real-time monitoring and fault warning of power quality.

[0005] The application is implemented by the following technical solutions:

[0006] The application provides a power quality monitoring device based on DSP, which comprises:

[0007] A data acquisition unit comprising voltage sensors and current sensors arranged at a plurality of key nodes in the power grid for acquiring voltage and current signals at different locations in the power grid in real time;

[0008] A signal conditioning unit for performing enhanced filtering on the acquired voltage and current signals;

[0009] A multi-channel data processing unit comprising a plurality of parallel processing channels, each of which is capable of independently processing output signals from the signal conditioning unit;

[0010] A DSP control unit for executing control logic on the multi-channel data processing unit, coordinating the operation of the plurality of processing channels, ensuring synchronized data reception, and performing analysis and processing on the received data;

[0011] A power supply loop control unit for controlling the on-off state of load power supply by connecting a thyristor in series in the power supply loop, with the gate of the thyristor connected to the control output of the DSP control unit;

[0012] A communication unit connected to the DSP control unit for transmitting data processed by the DSP control unit to a monitoring center.

[0013] Further, the signal conditioning unit comprises:

[0014] A dual operational amplifier noise reduction circuit for noise reduction processing of signals output by the data acquisition unit, suppressing common-mode noise through the differential amplification characteristics of the dual operational amplifier;

[0015] A reference bias circuit for providing a reference voltage for the dual operational amplifier noise reduction circuit;

[0016] A low-pass filter circuit for low-pass filtering of the amplified signals to obtain low-frequency signal components filtered of high-frequency noise and interference.

[0017] Further, the dual operational amplifier noise reduction circuit comprises an operational amplifier AR1 and an operational amplifier AR2, the non-inverting input of the operational amplifier AR1 is connected to one end of a resistor R1 and a capacitor C1, and is connected to the non-inverting input of the operational amplifier AR2 and the output of the reference bias circuit through a resistor R3, the other end of the resistor R1 is connected to the sensor signal output of the data acquisition unit, and the other end of the capacitor C1 is connected to ground through a resistor R2; the output of the operational amplifier AR1 is connected to the non-inverting input of the operational amplifier AR2 through a resistor R4; the inverting input of the operational amplifier AR2 is connected to the output of the operational amplifier AR2 and one end of a resistor R6 through a parallel-connected resistor R5 and a capacitor C2, and the other end of the resistor R6 is connected to the inverting input of the operational amplifier AR1 through a capacitor C3.

[0018] Further, the reference bias circuit includes a +5V power supply, which is connected to one end of an adjustable resistor RP1 through a resistor R7, and the other end of the adjustable resistor RP1 is grounded, the adjustable resistor RP1 is connected to the cathode of a stabilizing diode DZ1, and the anode of the stabilizing diode DZ1 is grounded, and the adjustable resistor RP1 is connected to the non-inverting input terminal of an operational amplifier AR3 through a resistor R8, the non-inverting input terminal of the operational amplifier AR3 is connected to the inverting input terminal and one end of a resistor R10 of an operational amplifier AR2 through a resistor R9, and the other end of the resistor R10 is grounded.

[0019] Further, the low-pass filter circuit includes a resistor R11, a resistor R12 and a capacitor C4, one end of the resistor R12 and the capacitor C4 is connected to the output terminal of the operational amplifier AR2 and the input terminal of the multi-channel data processing unit, the other end of the capacitor C4 is connected to one end of the resistor R11, and the other end of the resistor R11 and the resistor R12 is grounded.

[0020] Further, the multi-channel data processing unit includes:

[0021] an A / D converter, which is used to convert the analog signal output by the signal conditioning unit into a digital signal, and send the digital signal to the DSP control unit for digital signal processing;

[0022] a data buffer, which is used to temporarily store the digital signal output by the A / D converter, ensure the continuity and integrity of the data, and buffer the processing pressure of the DSP control unit.

[0023] Further, the protection assembly is arranged between the thyristor and the DSP control unit.

[0024] Further, the protection assembly includes a resistor R13, a stabilizing diode DZ2 and a capacitor C5, one end of the resistor R13 is connected to the PWM control output terminal of the DSP control unit, the other end of the resistor R13 is connected to the cathode of the stabilizing diode DZ2, one end of the capacitor C5 and the gate of the thyristor, and the anode of the stabilizing diode DZ2 and the other end of the capacitor C5 are grounded.

[0025] Further, the power supply circuit control unit further includes a thyristor Q1, a diode LED1, a resistor R14, a capacitor C6 and a connector J1, the base of the thyristor Q1 is connected to the resistor R13, the stabilizing diode DZ2 and the capacitor C5, the collector of the thyristor Q1 is connected to the positive electrode of the LED1, the negative electrode of the LED1 is grounded, and the emitter of the thyristor Q1 is connected to the resistor R14, the capacitor C6 and the connector J1 in sequence.

[0026] Further, the communication unit is an RF wireless radio frequency module.

[0027] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0028] Through the setting of the data acquisition unit, the voltage and current signals of multiple key nodes in the power grid can be collected in real time and accurately, and the design of the signal conditioning unit fully considers the complexity and noise interference of the power grid signals; through the comprehensive use of the double operational amplifier noise reduction circuit, the reference bias circuit and the low-pass filter circuit, the device can effectively reduce noise and improve the signal-to-noise ratio and purity of the signals. The introduction of the multi-channel data processing unit enables the device to efficiently process a large amount of power grid data, thereby greatly improving the speed and efficiency of data processing; as the core component of the device, the DSP control unit not only has strong data processing capability, but also has excellent coordination and control capability, realizing real-time monitoring and fault warning of power quality. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0030] Figure 1 The system module structure block diagram provided for the embodiments of the present application;

[0031] Figure 2 The structure block diagram of the signal conditioning unit provided for the embodiments of the present application;

[0032] Figure 3 The circuit principle diagram of the signal conditioning unit provided for the embodiments of the present application;

[0033] Figure 4 The circuit principle diagram of the power supply circuit control unit provided for the embodiments of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application more clear and obvious, the following will further describe the present application in combination with the embodiments and drawings, and the exemplary embodiments of the present application and their descriptions are only used to explain the present application, and should not be regarded as a limitation on the present application.

[0035] As a possible embodiment, the present embodiment provides a power quality monitoring device based on DSP, and the foregoing and other technical contents, features and effects of the present embodiment will be described below in cooperation with the drawings Figures 1 to 4 The detailed description of the embodiments will be clearly presented. The structural contents mentioned in the following embodiments are all referred to the drawings of the specification.

[0036] As shown in Figure 1 , the DSP-based power quality monitoring device comprises:

[0037] a data acquisition unit comprising voltage sensors and current sensors arranged at multiple key nodes in the power grid, for acquiring voltage and current signals in real time at different positions in the power grid;

[0038] a signal conditioning unit for performing enhanced filtering processing on the acquired voltage and current signals;

[0039] a multi-channel data processing unit comprising multiple parallel processing channels, each of which can independently process the output signals from the signal conditioning unit;

[0040] a DSP control unit for executing control logic on the multi-channel data processing unit, coordinating the work of each processing channel, ensuring synchronous reception of data, and performing analysis and processing on the received data;

[0041] a power supply loop control unit for realizing the on-off state of load power supply by connecting thyristors in series in the power supply loop, with the gate of the thyristor connected to the control output end of the DSP control unit;

[0042] a communication unit connected to the DSP control unit for transmitting the processed data of the DSP control unit to the monitoring center.

[0043] In the above, the data acquisition unit monitors the key nodes of the power grid in real time, and obtains the original signals of voltage and current through voltage sensors and current sensors, to ensure that various changes in power grid operation can be captured completely.

[0044] In order to ensure the accuracy of power data monitoring, the signal conditioning unit performs necessary preprocessing on the collected original signals. In order to adapt to complex signals in different power grid environments, as shown in Figure 2 , the design of the signal conditioning unit comprises:

[0045] a dual-op-amp noise reduction circuit for performing noise reduction processing on the signals output by the data acquisition unit, suppressing common-mode noise through the differential amplification characteristics of the dual op-amp, and improving the signal-to-noise ratio of the signals;

[0046] a reference bias circuit for providing a stable reference voltage for the dual-op-amp noise reduction circuit, to ensure the accuracy and stability of signal processing;

[0047] a low-pass filter circuit for performing low-pass filtering on the amplified signals, filtering out high-frequency noise and interference, and retaining useful low-frequency signal components.

[0048] In a specific embodiment, as shown in Figure 3As shown, the dual operational amplifier noise reduction circuit includes operational amplifier AR1 and operational amplifier AR2. The non-inverting input terminal of operational amplifier AR1 is connected to one end of resistor R1 and capacitor C1, and is connected to the non-inverting input terminal of operational amplifier AR2 and the output terminal of the reference bias circuit through resistor R3. The other end of resistor R1 is connected to the sensor signal output terminal of the data acquisition unit, and the other end of capacitor C1 is connected to ground through resistor R2. The output terminal of operational amplifier AR1 is connected to the non-inverting input terminal of operational amplifier AR2 through resistor R4. The inverting input terminal of operational amplifier AR2 is connected to the output terminal of operational amplifier AR2 and one end of resistor R6 through parallel resistor R5 and capacitor C2, and the other end of resistor R6 is connected to the inverting input terminal of operational amplifier AR1 through capacitor C3.

[0049] During the operation of the dual operational amplifier noise reduction circuit, the sensor signal of the data acquisition unit is first filtered by RC to eliminate high-frequency noise, ensuring that only low-frequency signal components can pass smoothly. The output terminal of operational amplifier AR1 is connected to the non-inverting input terminal of operational amplifier AR2 through resistor R4, forming a differential amplifier circuit. This design utilizes the differential amplification characteristics of operational amplifiers, effectively suppressing common-mode noise and improving the signal-to-noise ratio of the signal. At the same time, the inverting input terminal of operational amplifier AR2 is connected to the output terminal of operational amplifier AR2 through parallel resistor R5 and capacitor C2, forming a feedback network that not only helps stabilize the circuit but also further suppresses noise. Resistor R6 and capacitor C3 form a closed-loop feedback compensation between the inverting input terminal of operational amplifier AR1 and the output terminal of operational amplifier AR2 to ensure that the final output signal is smoother and reduces signal distortion caused by high-frequency noise.

[0050] Furthermore, the non-inverting input terminals of operational amplifier AR1 and operational amplifier AR2 are connected to the output of the reference bias circuit, providing a stable reference voltage for the entire dual operational amplifier circuit to ensure the accuracy and stability of signal processing. The reference bias circuit includes a +5V power supply, which is connected to one end of adjustable resistor RP1 through resistor R7. The other end of adjustable resistor RP1 is connected to ground. The adjustment end of adjustable resistor RP1 is connected to the cathode of zener diode DZ1 and to the non-inverting input terminal of operational amplifier AR3 through resistor R8. The anode of zener diode DZ1 is connected to ground. The inverting input terminal of operational amplifier AR3 is connected to the non-inverting input terminal of operational amplifier AR2 and one end of resistor R10 through resistor R9. The other end of resistor R10 is connected to ground.

[0051] In addition, in order to improve the anti-interference ability of the device, the low-pass filter circuit is also designed in the signal conditioning unit circuit to further optimize the signal processing process. Through the filtering function of the resistance and capacitance elements, high-frequency noise is effectively filtered out, ensuring the quality of the signal received by the data processing unit. Specifically, the low-pass filter circuit includes resistors R11, R12 and capacitor C4. One end of resistors R12 and capacitor C4 is connected to the output of operational amplifier AR2 and the input of the multi-channel data processing unit. The other end of capacitor C4 is connected to one end of resistor R11. The other ends of resistors R11 and R12 are grounded.

[0052] The working process of the above-mentioned signal conditioning unit circuit is a delicate signal processing process. Through differential amplification and filtering technology, noise is effectively reduced and signal purity is improved. The cooperative work of operational amplifiers AR1 and AR2 ensures that the signal can be sent to the data processing system at the back end with higher quality after processing. The entire circuit design fully considers the integrity and stability of the signal, ensuring the reliable operation of the power quality monitoring device in various complex environments.

[0053] Due to the large and complex scale of the power grid, real-time monitoring and processing of data from multiple nodes are required to ensure stable operation of the power grid. The multi-channel data processing unit provides multiple parallel processing channels, each of which can independently receive and process the output signals from the signal conditioning unit, greatly improving the speed and efficiency of data processing. Specifically, the multi-channel data processing unit includes:

[0054] An A / D converter for analog-to-digital conversion of the analog signals output by the signal conditioning unit, converting the analog signals into digital signals and sending them to the DSP control unit for digital signal processing;

[0055] A data buffer for temporarily storing the digital signals output by the A / D converter, ensuring data continuity and integrity, and buffering the processing pressure of the DSP control unit.

[0056] In the specific working process, the data acquisition unit collects voltage and current signals at different positions in the power grid in real time through voltage sensors and current sensors installed in the power grid. These signals are enhanced and filtered by the signal conditioning unit to improve the quality and reliability of the signals. Then, the processed analog signals are sent to the A / D converter in the multi-channel data processing unit. The A / D converter converts these analog signals into digital signals for subsequent digital signal processing.

[0057] The digital signals are sent to the data buffer for temporary storage after the conversion is completed. The data buffer ensures the continuity and integrity of the data, and also relieves the processing pressure of the DSP control unit. In this way, the DSP control unit can further process and analyze the digital signals stored in the data buffer without time constraints.

[0058] In a specific embodiment, the DSP control unit is started and initialized, and necessary programs and configuration parameters are loaded. These programs and parameters are usually stored in non-volatile memory to ensure their retention after power failure. After initialization is completed, the DSP control unit enters a standby state and waits for instructions or data from the multi-channel data processing unit.

[0059] When the multi-channel data processing unit starts working, it sends the digital signals converted by the A / D converter to the data buffer for temporary storage. At the same time, the DSP control unit communicates with the multi-channel data processing unit through internal buses or interfaces to obtain information about the status of the processing channels and data transmission. After ensuring that all processing channels are ready to receive data, the DSP control unit issues a synchronous reception instruction. This instruction triggers all processing channels in the multi-channel data processing unit to start receiving data simultaneously. Because the DSP control unit has strong coordination capabilities, it can ensure that the processing channels remain synchronized when receiving data, thereby avoiding data loss or misplacement.

[0060] During data reception, the DSP control unit also performs real-time analysis and processing of the data, including pre-processing operations such as data filtering, noise reduction, and enhancement, as well as subsequent feature extraction, pattern recognition, and other advanced processing tasks. In addition, the DSP control unit is responsible for generating real-time monitoring reports and historical data analysis, and through the built-in timer, it can generate statistical reports of power quality on a regular basis, helping users understand long-term power quality trends.

[0061] In system design, the DSP control unit also communicates with other systems through the configuration communication unit to achieve data sharing and remote monitoring. Specifically, the communication unit is an RF wireless radio frequency module. Through the RF wireless radio frequency module, the DSP control unit can transmit the data collected by the power quality monitoring device to a remote server or control center in real time. This wireless communication method not only improves the flexibility of data transmission, but also enhances the scalability of the system. Users can access these data from anywhere through the network for real-time monitoring and analysis.

[0062] In the specific control process, the DSP control unit first analyzes the current, voltage and other parameters of the current power supply circuit according to the received power data, and judges whether it is within the normal range. If abnormal parameters occur, such as overcurrent, overvoltage and the like, the DSP control unit will immediately adjust the trigger angle of the thyristor Q1 to limit the rise of current and voltage, thereby protecting the safety of the power supply circuit and the load device.

[0063] As shown in Figure 4 The protection assembly is provided between the thyristor Q1 and the DSP control unit, and includes a resistor R13, a zener diode DZ2 and a capacitor C5. One end of the resistor R13 is connected to the PWM control output end of the DSP control unit, the other end of the resistor R13 is connected to the cathode of the zener diode DZ2, one end of the capacitor C5 and the gate of the thyristor Q1, and the anode of the zener diode DZ2 and the other end of the capacitor C5 are grounded. The power supply circuit control unit further includes a thyristor Q1, a diode LED1, a resistor R14, a capacitor C6 and a connector J1. The base of the thyristor Q1 is connected to the resistor R13, the zener diode DZ2 and the capacitor C5, the collector of the thyristor Q1 is connected to the positive electrode of the LED1, the negative electrode of the LED1 is grounded, and the emitter of the thyristor Q1 is connected to the resistor R14, the capacitor C6 and the connector J1 in sequence. When the AC power is turned on, the current passes through R13, DZ2 and C5 to provide a base current for Q1, so that Q1 is turned on. After Q1 is turned on, the current passes through R14 and C6, and then passes through LED1 to make LED1 light up, thereby indicating that the circuit has power. The functions of R14 and C6 may be to ensure that Q1 works stably at an appropriate voltage and to reduce noise in the circuit. The zener diode DZ2 and the capacitor C5 form a stable voltage reference point. During system operation, if voltage fluctuation or spikes occur, DZ2 can quickly respond to stabilize the voltage within a safe range, thereby protecting the thyristor Q1 from damage. The capacitor C5 plays a filtering role in the circuit, which can smooth out high-frequency noise in the PWM signal, ensure that the signal transmitted to the gate of the thyristor Q1 is clean and stable, and ensure the effectiveness of system control.

[0064] In summary, through the setting of the data acquisition unit, the voltage and current signals of multiple key nodes in the power grid can be collected in real time and accurately, and the design of the signal conditioning unit fully considers the complexity and noise interference of the power grid signals. Through the comprehensive use of the double operational amplifier noise reduction circuit, the reference bias circuit and the low-pass filter circuit, the device can effectively reduce noise and improve the signal-to-noise ratio and purity of the signal. The introduction of the multi-channel data processing unit enables the device to efficiently process a large amount of power grid data, thereby greatly improving the speed and efficiency of data processing. As the core component of the device, the DSP control unit not only has strong data processing capability, but also has excellent coordination and control capability, realizing real-time monitoring and fault warning of power quality.

[0065] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood or implied as indicating or implying relative importance.

[0066] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0067] In the several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different parts can be indirect couplings or communication connections through some interface, device or unit, and can be electrical, mechanical or in other forms.

[0068] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0069] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0070] The above is a further detailed description of the present application in combination with the specific embodiments, and cannot be deemed as limitation of the specific embodiments of the present application; for the skilled in the art and the related technical field, the expansion, operation method and data replacement based on the technical solution idea of the present application should be within the protection scope of the present application.

Claims

1. A DSP-based power quality monitoring device, characterized by, The application relates to a power supply circuit control unit which realizes the on-off state of load power supply by connecting a thyristor in series in the power supply circuit, wherein the gate electrode of the thyristor is connected to the control output end of the DSP control unit. The application relates to a communication unit which is connected to the DSP control unit and is used for transmitting the data processed by the DSP control unit to a monitoring center. The application relates to a double-operational-amplifier noise reduction circuit which is used for carrying out noise reduction processing on the signals output by the data acquisition unit and inhibits common-mode noise through the differential amplification characteristics of the double-operational-amplifier. The application relates to a reference bias circuit which is used for providing reference voltage for the double-operational-amplifier noise reduction circuit. The application relates to a low-pass filter circuit which is used for carrying out low-pass filtering on the signals processed by amplification and obtaining low-frequency signal components filtered from high-frequency noise and interference. The reference bias circuit comprises a +5V power supply, wherein one end of the +5V power supply is connected to one end of an adjustable resistor RP1 through a resistor R7, the other end of the adjustable resistor RP1 is grounded, the adjusting end of the adjustable resistor RP1 is connected to the cathode of a stabilizing diode DZ1 and is connected to the non-inverting input end of an operational amplifier AR3 through a resistor R8, the anode of the stabilizing diode DZ1 is grounded, the non-inverting input end and the output end of the operational amplifier AR3 are connected to the non-inverting input end of the operational amplifier AR2 and one end of a resistor R10 through a resistor R9, and the other end of the resistor R10 is grounded. The low-pass filter circuit comprises a resistor R11, a resistor R12 and a capacitor C4, one end of the resistor R12 and the capacitor C4 is connected to the output end of the operational amplifier AR2 and the input end of the multi-channel data processing unit, the other end of the capacitor C4 is connected to one end of the resistor R11, and the other ends of the resistor R11 and the resistor R12 are grounded. The application relates to a multi-channel data processing unit which comprises: ​ ​ ​ ​ 2. The DSP-based power quality monitoring device of claim 1, wherein, ​ 3. The DSP-based power quality monitoring device of claim 2, wherein, ​ 4. The DSP-based power quality monitoring device of claim 1, wherein, ​ An A / D converter is arranged to convert the analog signal outputted by the signal conditioning unit into a digital signal, and send the digital signal to the DSP control unit for digital signal processing.

5. The DSP-based power quality monitoring device of claim 1, wherein, The protection component is arranged between the thyristor and the DSP control unit.

6. The DSP-based power quality monitoring device of claim 5, wherein, The protection component comprises a resistor R13, a voltage stabilizing diode DZ2 and a capacitor C5, wherein one end of the resistor R13 is connected to the PWM control output end of the DSP control unit, the other end of the resistor R13 is connected to the cathode of the voltage stabilizing diode DZ2, one end of the capacitor C5 and the gate of the thyristor, and the anode of the voltage stabilizing diode DZ2 and the other end of the capacitor C5 are grounded.

7. The DSP-based power quality monitoring device of claim 6, wherein, The power supply loop control unit further comprises a thyristor Q1, a diode LED1, a resistor R14, a capacitor C6 and a connector J1; the base of the thyristor Q1 is connected to the resistor R13, the voltage stabilizing diode DZ2 and the capacitor C5, the collector of the thyristor Q1 is connected to the positive pole of the LED1, the negative pole of the LED1 is grounded, and the emitter of the thyristor Q1 is connected to the resistor R14, the capacitor C6 and the connector J1 in sequence.

8. The DSP-based power quality monitoring device of claim 1, wherein, The communication unit is an RF wireless radio frequency module.

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