CN112511192A - Power line carrier communication self-adaptive impedance matching method - Google Patents
Power line carrier communication self-adaptive impedance matching method Download PDFInfo
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- CN112511192A CN112511192A CN202011282989.1A CN202011282989A CN112511192A CN 112511192 A CN112511192 A CN 112511192A CN 202011282989 A CN202011282989 A CN 202011282989A CN 112511192 A CN112511192 A CN 112511192A
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- power line
- impedance
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- carrier communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
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- Computer Networks & Wireless Communication (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention relates to a power line impedance matching technology, and discloses a matching method based on power line impedance acquisition and matching control. The signals output by the calculation control part are divided into a plurality of gears by adopting a threshold matching rule, and the control is carried out according to the gears, so that frequent adjustment of a matching module is avoided, and the long-term running reliability is ensured. The method comprises the steps of obtaining power line impedance through a power line impedance acquisition module; the control quantity acquired by the operation processing of the acquired data controls the matching module to select proper matching impedance, so that the signal output power is improved to the maximum extent, and the communication capacity is improved.
Description
Technical Field
The invention relates to a medium-voltage power line carrier technology, in particular to a power line carrier communication self-adaptive impedance matching method.
Background
In recent years, with the development of power systems, power distribution automation, information transmission such as power information acquisition and the like is widely applied to power line carrier channels, so that the power line carrier channels are increasingly important, and higher requirements are put forward on the reliability of the power line carrier channels. However, in the PLC system, the power line is used as a communication channel, and the power line networking is complex, and due to the influences of channel attenuation, noise interference, electromagnetic compatibility and the like, the impedance of the power line changes randomly with time, which affects the communication quality.
The power line impedance fluctuates on the line, typically from tens of ohms to hundreds of ohms, which has a severe impact on the attenuation of the carrier channel. When the channel is not machined reasonably, and capacitive load and T-connection branch lines exist, the impedance change of the carrier channel is aggravated.
The carrier communication device cannot employ a fixed impedance output. To solve this problem, one of the methods is to perform adaptive impedance matching on the load impedance of the carrier communication device, i.e., measure its impedance value, and select the value of the compensation inductance or capacitance to cancel the reactance so that the load of the carrier communication device maintains a constant value. The current power line impedance matching method generally adopts a typical impedance value on a line for matching, the real-time matching is poor, the capacity of coping with the environmental change of the power line is limited, and the communication effect is easily influenced when the environmental impedance changes.
There are also methods of automatic impedance matching, which usually acquire impedance data after sending a specific signal and then adjust the reactance value of an adjustable device to adapt to the environment, and this method requires high real-time performance in acquiring impedance data, and the adjustment method adopted when matching the impedance of the power line has reliability problem in long-term operation
Disclosure of Invention
In order to overcome the defects or shortcomings of the prior art, the invention provides a power line carrier communication adaptive impedance matching method, which is mainly used for carrying out efficient and reliable real-time compensation on power line impedance change.
In order to achieve the purpose, the invention discloses a power line carrier communication adaptive impedance matching method, which calculates power line load impedance by actually acquiring voltage information during signal transmission, and adjusts a matching impedance gear according to the calculated power line load impedance, so that the power line can be matched with the power line impedance when changing.
The invention specifically comprises the following steps:
step 1: when the carrier signal is sent, the acquisition module is controlled to acquire voltage data on the sampling resistor and the signal source;
step 2: the calculation control module calculates a real voltage amplitude and a phase difference according to the acquired voltage data;
and step 3: calculating the relation between the impedance of the power line and the sampling resistor according to the voltage amplitude and the phase difference through a triangular relation, and simultaneously calculating the impedance assignment and the phase angle on the power line;
and 4, step 4: calculating a proper resistance value and a proper reactance value according to the impedance amplitude value and the phase angle of the power line, matching impedance gears, and selecting the most proper transformer ratio and reactance of the voltage device;
and 5: and selecting the on-off of a corresponding variable ratio switch of the voltage transformer and the on-off of a reactance gear according to the selected gear to access the matched impedance into the transmitting circuit.
Further, step 1 collects power line impedance data in real time while transmitting the carrier signal, and has real-time matching characteristics.
Furthermore, the matching impedance gear comprises a plurality of gears of capacitors and inductors, and the capacitors and the inductors can adapt to power line carrier communication environments with different resistance, inductance, capacitance and the like according to the calculated result.
Further, step 5 controls the impedance matching access according to the threshold gear level to avoid frequently adjusting the matching module to influence the service life of the matching module.
The invention has the beneficial effects that:
1. impedance data is collected when signals are sent, and the characteristic of real-time collection is achieved;
2. the adoption of a plurality of control gears during impedance matching control avoids frequent adjustment of a matching module, has reliability in long-term operation, and can adapt to the environments of an inductive circuit and a capacitive power line through multi-gear adjustment;
3. according to data acquisition, calculation processing and matching control sequence processing, the self-adaptive matching of impedance can be realized, and the communication capacity is improved.
Drawings
Fig. 1 is a block diagram of a power line carrier communication system according to the adaptive impedance matching method for power line carrier communication of the present invention.
Fig. 2 is a flow chart of the adaptive impedance matching method for power line carrier communication according to the present invention.
Fig. 3 is a schematic diagram of a power line impedance data acquisition module of the power line carrier communication adaptive impedance matching method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, a power line carrier communication system implementing the method adopts an adaptive impedance matching method, and includes a power line, a coupler matching impedance, an impedance, a transformer, an impedance acquisition module, a data processing module, an impedance matching section, and a signal output module, where the coupler is usually a high-voltage capacitive coupler, and implements signal feedback to the power line for transmission; the transformer realizes resistance conversion, and converts the impedance of the power line end into the impedance of the communication end; the signal output part generates and amplifies signals into signals to be transmitted. The impedance acquisition and processing part realizes the functions of impedance information acquisition and data processing. The impedance matching part controls the on-off of the gear control switch according to the result of the data processing part, so that a resistance-capacitance device access circuit with proper compensation is selected to enable the carrier communication channel to be in impedance matching.
As shown in fig. 2, which is a processing flow chart of the method, when a carrier signal is transmitted, the flows of the impedance acquisition module, the calculation processing module, the matching control module, and the like are sequentially executed to implement impedance matching.
The method mainly comprises the following steps:
step 1; when a signal is sent, the AD sampling is started, and the AD chip is controlled to collect the voltage on the sampling resistor and the voltage data of the signal source, as shown in fig. 3, the signal collection diagram mainly includes the signal source, the impedance of the power line terminal, the sampling resistor, and the sampling AD.
Step 2: the calculation control module can calculate the real voltage amplitude difference according to the acquired voltage data and calculate the phase difference.
And step 3: the relation between the power line impedance and the sampling resistor is calculated through the triangular relation, and the impedance assignment and the phase angle on the power line can be calculated due to the fact that the sampling resistor is a determined value.
And 4, step 4: and a matching resistance value and a reactance value can be calculated according to the impedance amplitude and the phase angle of the power line, and the most suitable variable ratio gear and reactance gear of the voltage transformer can be selected according to a threshold matching rule.
And 5: and according to the calculated gear, the corresponding on-off of the variable ratio switch of the voltage transformer and the on-off of the reactance gear can be selected to connect proper impedance into the transmitting circuit.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A power line carrier communication self-adaptive impedance matching method is characterized in that power line load impedance is calculated through voltage information during signal transmission, and a matching impedance gear is adjusted according to the calculated power line load impedance, so that the power line can be matched with the power line impedance when the power line changes.
2. The adaptive impedance matching method for power line carrier communication according to claim 1, comprising the steps of:
step 1: when the carrier signal is sent, the acquisition module is controlled to acquire voltage data on the sampling resistor and the signal source;
step 2: the calculation control module calculates a real voltage amplitude and a phase difference according to the acquired voltage data;
and step 3: calculating the relation between the impedance of the power line and the sampling resistor according to the voltage amplitude and the phase difference through a triangular relation, and simultaneously calculating the impedance assignment and the phase angle on the power line;
and 4, step 4: calculating a proper resistance value and a proper reactance value according to the impedance amplitude value and the phase angle of the power line, matching impedance gears, and selecting the most proper transformer ratio and reactance of the voltage device;
and 5: and selecting the on-off of a corresponding variable ratio switch of the voltage transformer and the on-off of a reactance gear according to the selected gear to access the matched impedance into the transmitting circuit.
3. The adaptive impedance matching method for power line carrier communication according to claim 1, wherein step 1 collects power line impedance data in real time while transmitting the carrier signal, and has a real-time matching characteristic.
4. The adaptive impedance matching method for power line carrier communication according to claim 1, wherein the matching impedance stage comprises multiple stages of capacitors and inductors, and the matching impedance stage can adapt to power line carrier communication environments different from resistive inductors, capacitive inductors and the like according to the calculation result.
5. The adaptive impedance matching method for power line carrier communication according to claim 2, wherein the step 5 controls the impedance matching access according to the threshold step to avoid frequent adjustment of the matching module to affect the service life of the matching module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011282989.1A CN112511192A (en) | 2020-11-17 | 2020-11-17 | Power line carrier communication self-adaptive impedance matching method |
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| CN202011282989.1A CN112511192A (en) | 2020-11-17 | 2020-11-17 | Power line carrier communication self-adaptive impedance matching method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849999A (en) * | 2015-12-04 | 2017-06-13 | 广东广联电子科技有限公司 | A kind of carrier telecommunication |
| CN109120307A (en) * | 2018-08-07 | 2019-01-01 | 南京邮电大学 | A kind of power-line carrier communication system and its band logical are coupled device |
| CN111614376A (en) * | 2020-03-05 | 2020-09-01 | 国网青海省电力公司果洛供电公司 | Medium voltage power line impedance test system based on medium voltage carrier communication device |
-
2020
- 2020-11-17 CN CN202011282989.1A patent/CN112511192A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849999A (en) * | 2015-12-04 | 2017-06-13 | 广东广联电子科技有限公司 | A kind of carrier telecommunication |
| CN109120307A (en) * | 2018-08-07 | 2019-01-01 | 南京邮电大学 | A kind of power-line carrier communication system and its band logical are coupled device |
| CN111614376A (en) * | 2020-03-05 | 2020-09-01 | 国网青海省电力公司果洛供电公司 | Medium voltage power line impedance test system based on medium voltage carrier communication device |
Non-Patent Citations (1)
| Title |
|---|
| 程鹏志,佘京兆: "电力线载波通信中的自适应阻抗匹配系统模型", 华北电力技术 * |
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