Power distribution network electric energy quality identification system

Abstract

The utility model provides a power quality identification system for a power distribution network, which comprises a central processing unit, and a signal processing module, a temperature sensor, an image sensor, a fault recorder, a positioning module, a display module, an alarm module, a voice identification module and a three-remote module which are electrically connected with the central processing unit, the input end of the signal processing module is connected with the current transformer and the voltage transformer, and the current transformer and the voltage transformer are both connected with the signal processing module and the fault recorder. According to the utility model, the temperature sensor, the fault recorder and other devices are introduced, more electric energy quality influence factor data are provided for the central processing unit, and data before and after a fault can be recorded through the fault recorder. Through image and voice recognition, work task tracing is realized. The display module can display the monitoring data of the power distribution network, and the alarm module gives an alarm when the data is abnormal. The three-remote module wirelessly collects power data of a power distribution network, and the automation level of power quality identification is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric energy monitoring technology, and specifically relates to a power quality identification system for a distribution network. Background Art

[0002] With the development of power systems, users and businesses are placing increasingly higher demands on power quality. Power quality issues have become increasingly prominent with the widespread use of high-power power electronic devices. The resulting harmonic pollution and reactive power shortages not only waste electricity but also impact the safe operation of power systems.

[0003] Power quality issues such as harmonics and voltage fluctuations not only affect the normal operation of certain complex and sophisticated equipment connected to the same distribution network, causing certain economic losses to electricity users, but can also lead to additional energy waste and even affect the measurement of electricity meters, causing unnecessary disputes between suppliers and users. Failure to promptly and effectively address power quality issues can result in significant economic losses. Existing power quality monitoring solutions offer limited functionality and provide incomplete monitoring of power quality. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a power quality identification system for a distribution network, so as to solve the deficiencies of the prior art described in the background technology.

[0005] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] A power quality identification system for a distribution network includes a central processing unit and a signal processing module electrically connected to the central processing unit, a temperature sensor, an image sensor, a fault recorder, a positioning module, a display module, an alarm module, a voice recognition module, and a three-remote control module. The input end of the signal processing module is connected to a current transformer and a voltage transformer, and the current transformer and the voltage transformer are both connected to the signal processing module and the fault recorder.

[0007] The signal processing module includes a signal processing core processor, a current signal filter, a voltage signal filter, a current signal amplifier, a voltage signal amplifier, an A / D conversion module, a zero-crossing comparator, a phase-locked loop and a communication interface module. The current signal filter and the voltage signal filter are respectively connected to the current signal amplifier and the voltage signal amplifier. The current signal filter and the voltage signal filter are both connected to the zero-crossing comparator. The current signal amplifier and the voltage signal amplifier are both connected to the A / D conversion module. The A / D conversion module, the zero-crossing comparator, the phase-locked loop and the communication interface module are all connected to the signal processing core processor.

[0008] Optionally, the central processing unit is an ARM processor or a DSP processor.

[0009] Optionally, the signal processing core processor is a CPLD chip.

[0010] Optionally, the current signal filter and the voltage signal filter are RC first-order low-pass filters.

[0011] Optionally, the current signal amplifier and the voltage signal amplifier are amplifier circuits based on operational amplifiers.

[0012] Optionally, the communication interface module is an HPI parallel port or a McBSP serial port.

[0013] Optionally, the voice recognition module includes a microphone and an AI voice recognition chip connected to an output end of the microphone.

[0014] Optionally, the three-remote control module is an ARTU-K8 three-remote control unit.

[0015] The beneficial effects of the above technical solution of the utility model are as follows:

[0016] This utility model introduces devices such as temperature sensors and fault recorders to provide the central processor with more data on factors affecting power quality, and provide more ways to adjust power quality. At the same time, the fault recorder can record data before and after the fault occurs, which can achieve more comprehensive observation of the power supply data of the distribution network. Through image and voice recognition, the identity information of the on-site staff of the distribution network can be monitored, the staff's work process can be recorded, and the work task can be traced. The display module can realize the display of distribution network monitoring data, and the alarm module will alarm when the data is abnormal. The positioning module can locate the location of the distribution network site, and can be combined with GIS map technology to monitor the monitored distribution network based on the location layout. The three remote modules provide telesignaling, telemetering and remote control functions, wirelessly collect switch signals, analog signals, and pulse signals of the distribution network, and improve the automation level of power quality identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a functional block diagram of the power quality identification system for distribution network of the present utility model;

[0018] Figure 2 This is a principle block diagram of the signal processing module of the power quality identification system of the distribution network of the present utility model;

[0019] Figure 3 This is a schematic diagram of the filtering and amplifying circuit of the signal processing module of the power quality identification system of the distribution network of the present invention;

[0020] Figure 4This is a principle block diagram of a hardware synchronous sampling circuit based on a phase-locked loop circuit for the power quality identification system of a distribution network of the present utility model. DETAILED DESCRIPTION

[0021] In order to make the technical problems to be solved, technical solutions and advantages of the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, the utility model proposes a power quality identification system for a distribution network, comprising a central processing unit 1 and a signal processing module 4 electrically connected to the central processing unit 1, a temperature sensor 5, an image sensor 6, a fault recorder 7, a positioning module 8, a display module 9, an alarm module 10, a voice recognition module 11 and a three-remote control module 12; the input end of the signal processing module 4 is connected to the current transformer 2 and the voltage transformer 3, and the current transformer 2 and the voltage transformer 3 are both connected to the signal processing module 4 and the fault recorder 7;

[0023] like Figure 2 As shown, the signal processing module 4 includes a signal processing core processor 41, a current signal filter 42, a voltage signal filter 43, a current signal amplifier 44, a voltage signal amplifier 45, an A / D conversion module 46, a zero-crossing comparator 47, a phase-locked loop 48 and a communication interface module 49. The current signal filter 42 and the voltage signal filter 43 are respectively connected to the current signal amplifier 44 and the voltage signal amplifier 45. The current signal filter 42 and the voltage signal filter 43 are both connected to the zero-crossing comparator 47. The current signal amplifier 44 and the voltage signal amplifier 45 are both connected to the A / D conversion module 46. The A / D conversion module 46, the zero-crossing comparator 47, the phase-locked loop 48 and the communication interface module 49 are all connected to the signal processing core processor 41.

[0024] The voice recognition module includes a microphone and an AI voice recognition chip connected to the microphone output. The microphone is used to collect voice signals, and the AI voice recognition chip is used to recognize the voice signals collected by the microphone. The AI voice recognition chip is not specifically limited to a specific model, such as the CI13XX series AI voice chip. The image sensor, which is a camera, collects and recognizes facial and vital image data of workers in the power distribution work area. Through image and voice recognition, the identity information of on-site workers in the power distribution network can be monitored, the worker's workflow can be recorded, and work tasks can be traced.

[0025] The fault recorder is connected to the current transformer and the voltage transformer, and is used to receive the current and voltage data of the distribution network, record the change signals of various electrical quantities before and after the fault, and judge the fault type and location.

[0026] The temperature sensor is used to monitor the temperature of the distribution network and can analyze the relationship between the power quality and temperature of the distribution network in real time, so as to facilitate the subsequent control or adjustment of the temperature to achieve the best distribution quality of the distribution network.

[0027] The display module is used to display the signals collected by the power quality monitoring module, fault diagnosis results, power quality parameters obtained by the processor, power quality control results, etc.; when the power quality parameters in the power quality monitoring module exceed the preset threshold or a fault occurs, the central processing unit issues an alarm instruction and the alarm module issues an alarm.

[0028] The positioning module adopts the Beidou module, which can locate the location of the distribution network site. The remote monitoring platform can combine GIS map technology to monitor the distribution network based on the location layout.

[0029] The three-remote module 12 is the ARTU-K8 three-remote unit. This series of products includes a remote signaling unit, a telemetry unit and a remote control unit, providing remote signaling, telemetry and remote control functions, wirelessly collecting switch signals, analog signals and pulse signals of the distribution network, and improving the automation level of power quality identification.

[0030] like Figure 3 As shown, the current signal filter 42 and the voltage signal filter 43 are RC first-order low-pass filters. In the figure, R416 and capacitor C413 form an RC low-pass filter. The current signal amplifier 44 and the voltage signal amplifier 45 are amplifier circuits based on operational amplifiers. This embodiment uses an inverting amplifier circuit based on an operational amplifier chip. The RC first-order low-pass filter is used to filter out high-order harmonic signals. The operational amplifier amplifies the filtered signal to a size that can be collected by the AD conversion module. The AD conversion module converts the analog signal into a digital signal and sends it to the signal processing core processor 41, where the signal processing core processor 41 is a CPLD chip, and various logic and signal controls are completed through the CPLD.

[0031] The communication interface module 49 is an HPI parallel port or a McBSP serial port, that is, the signal processing core processor (CPLD chip) is connected to the central processing unit 1 through the HPI parallel port or the McBSP serial port. The central processing unit 1 is an ARM processor or a DSP processor.

[0032] The signal processing core processor 41 is also connected to the zero-crossing comparator 41. The principle of the zero-crossing detection circuit is: by detecting the natural "zero-crossing" point of the AC signal in the cycle, a corresponding electrical signal output is generated. Specifically, it is a voltage comparator, and its input signal is the source signal that needs to be zero-crossed. The circuit converts the input signal into a relatively stable DC waveform by rectifying and filtering it, and then compares this DC waveform with a preset reference level. When the input signal passes through the zero point, the output signal will jump. This jump is regarded as a zero-crossing point and is captured and output by the circuit. In this embodiment, the zero-crossing detection circuit is mainly used to provide information about the cycle and phase of the AC signal, which is used to monitor the stability of the power grid and implement protection measures such as overload and undervoltage.

[0033] The signal processing core processor 41 is also connected to a phase-locked loop (PLL), a negative feedback control system that uses a voltage generated by phase synchronization to tune a voltage-controlled oscillator to produce a target frequency. Based on the principles of automatic control, this is a typical feedback control circuit that uses an external reference signal to control the frequency and phase of the oscillating signal within the loop, achieving automatic tracking of the output signal frequency to the input signal frequency. This circuit is typically used in closed-loop tracking circuits.

[0034] The voltage and current signals in the power system are periodic signals that contain multiple harmonic components and whose fundamental frequency will drift. If sampling is performed without restriction, serious leakage errors will occur due to the lack of synchronization between the sampling frequency and the signal fundamental frequency. A dedicated hardware circuit generates a sampling pulse that is synchronized with the measured signal, such as using a phase-locked loop to form a frequency tracking circuit, and then controlling the trigger signal of the digital sampling through a frequency division circuit to achieve synchronous and equidistant sampling. However, errors will also occur when the hardware loses lock. In order to reduce the burden on the processor and ensure the real-time performance of the system, the utility model adopts the following methods: Figure 4 The hardware synchronous sampling circuit shown here, based on a phase-locked loop (PLL), strictly controls the system sampling frequency to a certain multiple of the fundamental wave and can change rapidly with changes in the fundamental wave frequency. A sampling pulse generator, based on the NE564 PLL and CPLD, is designed, and the generated pulse signal serves as the driving clock signal for the A / D conversion module.

[0035] In summary, the utility model introduces devices such as temperature sensors and fault recorders to provide the central processor with more data on factors affecting power quality, and provide more ways to adjust power quality. At the same time, the fault recorder can record data before and after the fault occurs, which can achieve more comprehensive observation of the power supply data of the distribution network. Through image and voice recognition, the identity information of the on-site staff of the distribution network can be monitored, the work process of the staff can be recorded, and the work task can be traced. The display module can realize the display of distribution network monitoring data, and the alarm module will alarm when the data is abnormal. The positioning module can locate the location of the distribution network site, and can be combined with GIS map technology to monitor the monitored distribution network based on the location layout. The three remote modules provide telesignaling, telemetering and remote control functions, wirelessly collect switch signals, analog signals, and pulse signals of the distribution network, and improve the automation level of power quality identification.

[0036] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power quality identification system for a distribution network, characterized in that: It includes a central processing unit and a signal processing module electrically connected to the central processing unit, a temperature sensor, an image sensor, a fault recorder, a positioning module, a display module, an alarm module, a voice recognition module and a three-remote control module, wherein the input end of the signal processing module is connected to a current transformer and a voltage transformer, and the current transformer and the voltage transformer are both connected to the signal processing module and the fault recorder; The signal processing module includes a signal processing core processor, a current signal filter, a voltage signal filter, a current signal amplifier, a voltage signal amplifier, an A / D conversion module, a zero-crossing comparator, a phase-locked loop and a communication interface module. The current signal filter and the voltage signal filter are respectively connected to the current signal amplifier and the voltage signal amplifier. The current signal filter and the voltage signal filter are both connected to the zero-crossing comparator. The current signal amplifier and the voltage signal amplifier are both connected to the A / D conversion module. The A / D conversion module, the zero-crossing comparator, the phase-locked loop and the communication interface module are all connected to the signal processing core processor.

2. The power quality identification system for distribution network according to claim 1, characterized in that: The central processing unit is an ARM processor or a DSP processor.

3. The power quality identification system for distribution network according to claim 1, characterized in that: The signal processing core processor is a CPLD chip.

4. The power quality identification system for distribution network according to claim 1, characterized in that: The current signal filter and the voltage signal filter are RC first-order low-pass filters.

5. The power quality identification system for distribution network according to claim 1, characterized in that: The current signal amplifier and the voltage signal amplifier are amplifier circuits based on operational amplifiers.

6. The power quality identification system for distribution network according to claim 1, characterized in that: The communication interface module is an HPI parallel port or a McBSP serial port.

7. The power quality identification system for distribution network according to claim 1, characterized in that: The voice recognition module includes a microphone and an AI voice recognition chip connected to the output end of the microphone.

8. The power quality identification system for distribution network according to claim 1, characterized in that: The three-remote control module is the ARTU-K8 three-remote control unit.

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