CN109921828B - Inspection system based on narrowband low-voltage power line carrier communication - Google Patents
Inspection system based on narrowband low-voltage power line carrier communication Download PDFInfo
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- CN109921828B CN109921828B CN201910027329.XA CN201910027329A CN109921828B CN 109921828 B CN109921828 B CN 109921828B CN 201910027329 A CN201910027329 A CN 201910027329A CN 109921828 B CN109921828 B CN 109921828B
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Abstract
The invention relates to a narrow-band low-voltage power line carrier communication inspection system, which comprises: the electric energy acquisition module is used for acquiring electric energy signals; the microcontroller module is connected with the electric energy acquisition module and used for receiving and transmitting electric energy signals; the carrier communication module is connected with the microcontroller module and is used for modulating and demodulating the electric energy signal and converting the electric energy signal into an analog electric energy signal; the filtering module is connected with the carrier communication module and used for filtering interference signals of the analog electric energy signals; the coupling module is connected with the filtering module and is used for coupling the analog electric energy signal to the power line for transmission; and the zero-crossing detection module is connected with the coupling module and is used for detecting the zero-point moment of the voltage on the power line and eliminating the influence of the inherent pulse on the power line. The system provided by the invention transmits the routing inspection information through the power line, has a simple structure, is low in cost and flexible in deployment, does not need to be rewired, and can be deployed on occasions with small communication transmission bandwidth, low-voltage power lines and the like.
Description
Technical Field
The invention belongs to the technical field of power communication, and particularly relates to a narrow-band low-voltage power line carrier communication inspection system and method.
Background
The Power communication network is a foundation for supporting the reliable and stable operation of the Power network, the Power communication optical cable is a carrier for Power network enterprises to transmit various production information data, the reliability of the operation of the Power communication optical cable is directly related to the safe and stable operation of the Power network, in order to ensure the operation quality of the Power communication optical cable, the communication optical cable needs to be regularly checked and detected, the abnormal and broken points are analyzed and compared, the service information borne by the optical cable is checked, the Power carrier is a communication mode specific to the Power system, and Power carrier communication (Power L IneCommunication, P L C) refers to a technology for carrying out high-speed transmission on analog or digital signals in a carrier mode by utilizing the existing Power line, and the Power communication optical cable has the biggest characteristic that the data transmission can be carried out as long as the Power line is available without re-setting up the network.
In traditional mode of patrolling and examining, the handheld machine of patrolling and examining is accomplished mostly depending on the manual work to patrol and examine or manual work cooperation, patrols and examines the information through the mode record of paper. In addition, in the communication mode of the inspection system, a special wired network or wireless network is often adopted for transmission, the wired transmission is relatively reliable, and the wireless transmission is convenient.
However, the manual inspection mode has large human factors, the inspection information is not timely and completely recorded, the inspection information is not easy to store, and the historical record information is difficult to inquire. Because the cost for building a special wired network is high, a large amount of manpower and material resources are needed, and the difficulty is increased for greatly changing the existing old project, after a system is built, new equipment is often deployed in the system, if the frequency band bandwidth of communication is too small during system design, the frequency band bandwidth is possibly insufficient, even the original communication line is damaged, and the work of the whole system is influenced; in addition, wireless transmission is easily influenced by the surrounding environment, and when encountering shielding of large-scale objects, signal attenuation is large, interference resistance is poor, and later maintenance cost is high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a narrow-band low-voltage power line carrier communication-based polling system and a narrow-band low-voltage power line carrier communication-based polling method. The technical problem to be solved by the invention is realized by the following technical scheme:
the embodiment of the invention provides a narrow-band low-voltage power line based carrier communication inspection system, which comprises:
the electric energy acquisition module is used for acquiring electric energy signals;
the microcontroller module is connected with the electric energy acquisition module and is used for receiving and transmitting the electric energy signal;
the carrier communication module is connected with the microcontroller module and is used for modulating and demodulating the electric energy signal and converting the electric energy signal into an analog electric energy signal;
the filtering module is connected with the carrier communication module and is used for filtering interference signals of the analog electric energy signals;
the coupling module is connected with the filtering module and is used for coupling the analog electric energy signal to a power line for transmission;
and the zero-crossing detection module is connected with the power line and used for detecting the zero-point moment of the voltage on the power line and eliminating the influence of the inherent pulse on the power line.
In one embodiment of the present invention, further comprising: the surge suppression module is connected with the microcontroller module and the electric energy acquisition module and is used for suppressing voltage surge interference;
the surge suppression module comprises an isolation transformer, a plurality of piezoresistors and a plurality of safety capacitors which are connected with one another.
In one embodiment of the invention, the processor of the electric energy acquisition module is an AD71056 chip.
In one embodiment of the invention, the processor of the microcontroller module is an STM32F103C8T6 microcontroller.
In one embodiment of the present invention, the processor of the carrier communication module is an ST7580 chip.
In an embodiment of the present invention, the zero-crossing detection module is an optical coupling zero-crossing detection system.
In one embodiment of the invention, the filtering module comprises a transmit filter and a receive filter connected to each other.
In one embodiment of the invention, the transmitting filter comprises a first-order RC low-pass filter and a second-order Butterworth low-pass filter which are connected with each other, and the receiving filter is an R L C band-pass filter.
In one embodiment of the invention, the coupling module comprises a transformer and an L C resonant circuit connected to each other.
Another embodiment of the present invention provides a narrowband low-voltage power line carrier communication inspection method, including:
collecting an electric energy signal;
receiving and transmitting the electrical energy signal;
modulating and demodulating the electric energy signal to generate an analog electric energy signal;
filtering interference signals of the analog electric energy signals;
coupling the analog electrical energy signal to a power line for transmission;
and detecting the zero point moment of the voltage on the power line, and eliminating the influence of the inherent pulse on the power line.
Compared with the prior art, the invention has the beneficial effects that:
the system provided by the invention transmits the routing inspection information through the power line, the electric energy acquisition module transmits the acquired electric energy signal to the microcontroller module, the microcontroller module transmits the electric energy signal to the carrier communication module in a serial port mode, the carrier communication module carries out BPSK modulation on the electric energy signal, the analog electric energy signal formed after modulation is coupled to the power line for transmission after being processed by the filtering module and the coupling module, the structure is simple, the cost is low, the deployment is flexible, no rewiring is needed, the communication can be realized as long as the power line is provided, the power utilization condition of the field equipment is monitored through the terminal, the occurrence of electricity stealing behavior is prevented to a certain extent, the safety of electric energy is protected, and the terminal has certain practical value, the system can be deployed in occasions where communication transmission bandwidth is small, low-voltage power lines and old systems need to be changed greatly, such as a speed measuring system on a road, a street lamp system and the like.
Drawings
Fig. 1 is a schematic diagram of a transmission structure of an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a receiving structure of an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a surge suppression module in an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a connection relationship between a microcontroller module and a carrier communication module in a narrow-band low-voltage power line based carrier communication inspection system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a connection relationship between a microcontroller and an electric energy collection module in an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention;
fig. 6 is a circuit diagram of an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention;
fig. 7 is a circuit diagram of a zero-crossing detection module in an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention;
fig. 8 is a schematic flowchart of a polling method based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a sending structure of an inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a receiving structure of the inspection system based on narrowband low-voltage power line carrier communication according to an embodiment of the present invention.
The embodiment of the invention provides a narrow-band low-voltage power line carrier communication inspection system, which comprises:
the electric energy acquisition module is used for acquiring electric energy signals;
the microcontroller module is connected with the electric energy acquisition module and used for receiving and transmitting electric energy signals;
the carrier communication module is connected with the microcontroller module and is used for modulating and demodulating the electric energy signal and converting the electric energy signal into an analog electric energy signal;
the filtering module is connected with the carrier communication module and used for filtering interference signals of the analog electric energy signals;
the coupling module is connected with the filtering module and is used for coupling the analog electric energy signal to the power line for transmission;
and the zero-crossing detection module is connected with the power line and used for detecting the zero-point moment of the voltage on the power line and eliminating the influence of the inherent pulse on the power line.
Specifically, the inspection system provided by the invention is mainly used for collecting the electric energy of industrial field equipment, and some field equipment cannot be monitored manually because the field equipment is arranged in an unattended place. This system of patrolling and examining transmits the electric energy to the terminal after gathering the electric energy, and the user can just can estimate field device's power consumption condition through terminal monitoring, can avoid stealing the emergence of electric condition to a certain extent.
The field device is provided with an electric energy acquisition module, the electric energy acquisition module transmits acquired electric energy signals to a microcontroller module, the microcontroller module transmits the electric energy signals to a carrier communication module in a serial port mode, the carrier communication module carries out BPSK modulation on the electric energy signals, analog electric energy signals formed after modulation are coupled to a power line for transmission after being processed by a filtering module and a coupling module, and a zero-crossing detection module is used for removing the influence of inherent pulses on the power line in the transmission process of the analog electric energy signals.
At a receiving party, analog electric energy signals transmitted on the power line are processed by the coupling module and the filtering module and then transmitted to the carrier communication module, the carrier communication module demodulates the analog electric energy signals and transmits the formed digital electric energy signals to the controller module, the controller module is connected with a computer in a serial port mode, and a user can check the use condition of electric quantity by opening a serial port terminal on the computer.
Particularly, in the specific embodiment of the present invention, the method further includes: the surge suppression module is connected with the microcontroller module and the electric energy acquisition module and is used for suppressing voltage surge interference;
the surge suppression module comprises an isolation transformer, a plurality of piezoresistors and a plurality of safety capacitors which are connected with each other.
Specifically, as shown in fig. 3, the surge suppression module includes an isolation transformer, a plurality of piezoresistors, and a plurality of safety capacitors connected to each other. The fuse is F301, a 250V 1A glass tube fuse can be adopted, the piezoresistors R319, R324 and R325 can adopt MOV piezoresistors 471KD10, and when the input voltage is too high, the resistances of the piezoresistors R319, R324 and R325 are infinitesimal, so that the current is large, the fuse is fused, and the circuit is protected. The isolation transformer is T302, and a 1:1 isolation transformer is adopted, namely, 220V is input and 220V is output. Because the input and the output are isolated electrically, the safety function of electricity utilization is achieved. The safety capacitors C311, C312 and C313 can be all 275V 100nF, and since the internal charges of the ordinary capacitor can be retained for a period of time after the power is cut off, the ordinary capacitor can be shocked if being touched carelessly, and the safety capacitors can discharge rapidly after the power is cut off, the electric shock can be effectively avoided. Meanwhile, the 3 safety capacitors play a role in filtering, wherein the safety capacitor C312 filters differential mode interference, and the safety capacitor C311 and the safety capacitor C313 filter common mode interference.
In particular, in the embodiment of the present invention, the processor of the power acquisition module is an AD71056 chip.
In particular, in the specific embodiment of the present invention, the processor of the microcontroller module is an STM32F103C8T6 microcontroller.
Particularly, in the embodiment of the present invention, the processor of the carrier communication module is an ST7580 chip.
Specifically, as shown in fig. 4 and 5, the AD71056 chip of the electric energy acquisition module acquires an electric energy signal to achieve electric energy acquisition. The processor STM32F103C8T6 microcontroller of the microcontroller module receives the collected electric energy signal of the AD71056 chip.
The processor of the carrier communication module selects the ST7580 chip, an amplifying circuit in the ST7580 chip can amplify power of the electric energy signal, and the amplifying circuit has the advantages of high input impedance, output impedance, stable performance and the like.
The STM32F103C8T6 microcontroller and the ST7580 chip adopt a serial communication mode, the PC13 of the STM32F103C8T6 controls the enabling end of the received electric energy signal of the ST7580 chip, and the PC14 controls the enabling end of the transmitted electric energy signal of the ST7580 chip. The microcontroller module is a control core of the whole system and is responsible for control and scheduling of the whole system, and stronger processing capacity is required, so that the STM32F103C8T6 with high cost performance is selected. The modulation and demodulation of the electric energy signal are completed by a carrier communication module, the anti-interference capability is required, and the integration level is high, so that an ST7580 chip is selected.
Particularly, in the specific embodiment of the present invention, the zero-crossing detection module is an opto-coupler zero-crossing detection system.
Specifically, as shown in fig. 6, because the alternating current on the power line has inherent pulses, and the noise is minimum at the time of the zero point, a zero-cross detection circuit is added, and the optical coupler zero-cross detection method is specifically adopted. During one cycle of 220V ac, two zeros will occur. By controlling the on and off of the optocoupler, a triode Q1 is controlled, high and low levels appear on a resistor R4, then an ST7580 chip judges the zero point moment according to the rising edge or the falling edge, wherein a transistor BMPT3904 is adopted as a triode Q1, and a 1M ohmic resistor is adopted as a resistor R4.
In particular, in a specific embodiment of the present invention, the filtering module includes a transmitting filter and a receiving filter connected to each other.
In particular, in the embodiment of the invention, the transmitting filter comprises a first-order RC low-pass filter and a second-order Butterworth low-pass filter which are connected with each other, and the receiving filter is an R L C band-pass filter.
Specifically, as shown in fig. 7, the filtering module includes a transmitting filter and a receiving filter connected to each other; the transmitting filter comprises a first-order RC low-pass filter and a second-order Butterworth low-pass filter which are connected with each other, high-frequency components in a current signal can be effectively filtered, the resistor R14 and the capacitor C10 form the first-order RC low-pass filter, and cut-off frequency is achieved
The resistor R14 adopts an ohmic resistor of 1K5, and the capacitor C10 adopts a capacitor of 1 nF; the resistor R15, the resistor R16, the capacitor C2 and the capacitor C9 form a second-order Butterworth low-pass filter with cut-off frequency
The resistor R15 adopts 1K5 ohmThe resistor R16 is an ohmic resistor of 22K, and the capacitor C2 and the capacitor C9 are capacitors of 100 pF.
The receiving filter is an R L C band-pass filter, and the R L C band-pass filter is realized by a resistor R17, an inductor L2 and a capacitor C12, and the center frequency of the R12C band-pass filter is higher than that of the receiving filter
The resistor R17 adopts an ohmic resistor of 150R, the inductor L2 adopts an inductor of 220uH, and the capacitor C12 adopts a capacitor of 25V 18 nF.
In particular, in a particular embodiment of the present invention, the coupling module includes a transformer and an L C resonant circuit connected to each other.
Specifically, as shown in fig. 7, the coupling module includes a transformer and an L C resonant circuit connected to each other, a series resonant circuit is formed by a capacitor C7 and an inductor L1, carrier signals of other frequencies can be blocked, an X-type 220nF safety capacitor is selected for the capacitor C7, the influence of pulses is effectively prevented, an inductor of 50V 15uH is selected for the inductor L1, a transformer T1 is used for reducing the voltage of an access system, surge can be effectively suppressed by adding high-performance TVS tubes D6 and D7, and transient suppression diodes of SMBT6.8CA are adopted for D6 and D7.
In particular, as shown in fig. 8, on the basis of the foregoing embodiment, the present invention provides a polling method based on narrowband low-voltage power line carrier communication, including:
collecting an electric energy signal;
receiving and transmitting an electrical energy signal;
modulating and demodulating the electric energy signal to generate an analog electric energy signal;
filtering interference signals of the analog electric energy signals;
coupling the analog electric energy signal to a power line for transmission;
the time of the zero point of the voltage on the power line is detected, and the influence of the inherent pulse on the power line is prevented.
The system provided by the invention communicates the routing inspection information through the power line, the electric energy acquisition module transmits the acquired electric energy signal to the microcontroller module, the microcontroller module transmits the electric energy signal to the carrier communication module in a serial port mode, the carrier communication module carries out BPSK modulation on the electric energy signal, the analog electric energy signal formed after modulation is coupled to the power line for transmission after being processed by the filtering module and the coupling module, the structure is simple, the cost is low, the deployment is flexible, no rewiring is needed, the communication can be realized as long as the power line is provided, the power utilization condition of the field equipment is monitored through the terminal, the occurrence of electricity stealing behavior is prevented to a certain extent, the safety of electric energy is protected, and the terminal has certain practical value, the system can be deployed in occasions where communication transmission bandwidth is small, low-voltage power lines and old systems need to be changed greatly, such as a speed measuring system on a road, a street lamp system and the like.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. The utility model provides a system of patrolling and examining based on narrowband low pressure power line carrier communication which characterized in that includes:
the electric energy acquisition module is used for acquiring electric energy signals;
the microcontroller module is connected with the electric energy acquisition module and is used for receiving and transmitting the electric energy signal;
the carrier communication module is connected with the microcontroller module and is used for modulating and demodulating the electric energy signal and converting the electric energy signal into an analog electric energy signal;
the filtering module is connected with the carrier communication module and is used for filtering interference signals of the analog electric energy signals to obtain filtered analog electric energy signals;
the coupling module is connected with the filtering module and is used for coupling the filtered analog electric energy signal to a power line for transmission;
the zero-crossing detection module is connected with the power line and used for detecting the zero-point moment of the voltage on the power line and eliminating the influence of the inherent pulse on the power line;
the surge suppression module is connected with the microcontroller module and the electric energy acquisition module and is used for suppressing voltage surge interference; the surge suppression module comprises an isolation transformer, a plurality of piezoresistors, a plurality of safety capacitors and two fuses which are connected with each other,
one end of a fuse F301 is connected with the live wire input end, and the other end of the fuse F301 is connected with one end of a voltage dependent resistor R324, one end of a voltage dependent resistor R319, one end of a safety capacitor C312 and the first input end of an isolation transformer;
one end of a fuse RT301 is connected with the input end of a zero line, and the other end of the fuse RT301 is connected with one end of a piezoresistor R325, the other end of the piezoresistor R319, the other end of the safety capacitor C312 and the second input end of the isolation transformer;
the first output end of the isolation transformer is connected with one end of a safety-regulation capacitor C311 and the live wire output end, the second output end of the isolation transformer is connected with one end of a safety-regulation capacitor C313 and the zero line output end, and the other end of the safety-regulation capacitor C311 is connected with the other end of the safety-regulation capacitor C313;
the other end of the piezoresistor R324, the other end of the piezoresistor R325, the other end of the safety capacitor C311 and the other end of the safety capacitor C313 are all grounded.
2. The inspection system according to claim 1, wherein the processor of the power acquisition module is an AD71056 chip.
3. The inspection system according to claim 1, wherein the processor of the microcontroller module is an STM32F103C8T6 microcontroller.
4. The inspection system according to claim 1, wherein the processor of the carrier communication module is an ST7580 chip.
5. The system of claim 1, wherein the zero-crossing detection module is an opto-coupler zero-crossing detection system.
6. The inspection system according to claim 1, wherein the filtering module includes a transmit filter and a receive filter coupled to each other.
7. The inspection system according to the claim 6, wherein the transmitting filter includes a first-order RC low-pass filter and a second-order Butterworth low-pass filter connected to each other, and the receiving filter is an R L C band-pass filter.
8. The inspection system according to claim 1, wherein the coupling module includes a transformer and an L C resonant circuit coupled to each other.
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