CN110299932B - Power distribution network and equipment running state online identification method based on power line signal - Google Patents
Power distribution network and equipment running state online identification method based on power line signal Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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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
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
Abstract
The utility model provides a power distribution network and equipment running state online identification method based on power line signals, which comprises the following steps: the power distribution network transformer and the power distribution switch are provided with power line carrier communication equipment, the background master station system coordinates the power line carrier equipment to establish communication connection, the power line carrier communication equipment measures high-frequency impedance of the installation position, the power line carrier communication equipment measures signal noise of the installation position, the power line carrier communication equipment uploads characteristic information of the background master station system, and the background master station system identifies equipment and network faults. The power distribution network and equipment states are analyzed and identified based on the high-frequency impedance and the signal noise of the power line communication, compared with the prior art, the system mining improves the hidden rich information of the power line signals, and provides a new technical support means for advanced informatization and intelligent development of the power distribution network.
Description
Technical Field
The utility model belongs to the technical field of electric power, relates to distribution network fault detection, and discloses a distribution network and equipment running state online identification method based on power line signals.
Background
The cable is mainly buried underground, does not affect the appearance, avoids various interferences of external environment, gradually replaces the original overhead line, and is applied to distribution network reconstruction and construction engineering on a large scale. The probability of occurrence of a failure increases due to an increase in the cable use time, and causes of the failure include the level of the cable manufacturing process, external damage, deterioration due to operation, and the like. The cable operation environment is hidden, so that the fault is difficult to be directly observed, and if the fault cannot be early-warned and timely eliminated better, the potential significant influence is exerted on the power supply reliability of the power distribution network.
The chinese patent application "fault location device for distribution network line state monitoring, fault early warning and location technology based on distributed phasor measurement", CN201721158291.2, relates to a fault location device for distribution network line state monitoring, fault early warning and location technology based on distributed phasor measurement, which comprises a current monitoring unit, a voltage monitoring unit, a collection unit and a master station; the voltage and current monitoring unit actively transmits the collected load voltage of the line every 15min during normal operation, the current fixed point data is actively transmitted to the collecting unit, the collecting unit analyzes and processes the load voltage and the current fixed point data and then uploads the load voltage to the main station, and the line state of the distribution network line is visually presented at the main station through interface display modes such as graphs, curves and tables. The utility model has low cost and high cost performance, can be installed conveniently in a charged manner, and is free from maintenance; the current and voltage waveforms of each monitoring point can be recorded; the section where the single-phase earth fault and the short-circuit fault occur can be accurately positioned. The method is mainly realized by a distributed phasor measurement unit, and the high-frequency impedance measurement and the power line communication noise measurement proposed by the method are not involved.
Chinese patent "distribution network cable line running state monitoring and fault recording diagnostic device", ZL201520098241.4, discloses a distribution network cable line running state monitoring and fault recording diagnostic device, which has a coil box, a processing part and a connecting part, wherein the coil box is used for accommodating rogowski coils, the processing part is used for accommodating signal processing devices, the connecting part accommodates connecting wires, wherein the coil box can be divided into two halves so as to be sleeved on a cable line to be tested, the rogowski coils accommodated in the coil box can also be divided into two corresponding halves, the two rogowski coils are connected from the outside by flexible wires, the connecting flexible wires are accommodated in the connecting part, and leading wires are led out from the part of rogowski coils accommodated in the coil box with the processing part and connected to the corresponding signal processing devices in the processing part. The utility model discloses a diagnosis is realized mainly through trouble oscillograph device off-line, does not involve the high frequency impedance measurement and the power line communication noise measurement that this application provided.
The Chinese patent application 'a state monitoring system for intelligent power distribution network ring main unit', CN201310165573.5, relates to a state monitoring system for intelligent power distribution network ring main unit, which comprises a data acquisition analysis processing unit, an opening and closing current sensor, an opening and closing voltage sensor, an operation pressure sensor, a stroke sensor, a vibration sensor, a temperature sensor and a partial discharge sensor, wherein the data acquisition analysis processing unit is connected with the opening and closing current sensor, the opening and closing voltage sensor, the operation pressure sensor, the stroke sensor, the vibration sensor, the temperature sensor and the partial discharge sensor. The utility model provides a unified platform of an on-line monitoring system of a switch device of a power distribution network, which is used for realizing the on-line monitoring and global analysis of the overall condition of a switch of the power distribution network by collecting the opening and closing current, the operating voltage, the operating pressure, the joint temperature, the contact stroke and the partial discharge condition of an access switch through the on-line monitoring device of the switch, so that the on-line monitoring system of the power distribution network, which has unified data, unified interfaces, unified deployment and effective data interaction, is provided. However, the application mainly realizes monitoring through various sensors, and does not relate to high-frequency impedance measurement and power line communication noise measurement proposed by the patent.
None of the above documents relate to high frequency impedance measurement and power line communication noise measurement, and none of the prior art considers identifying the operating state of the distribution network by means of high frequency impedance and power line communication noise.
Disclosure of Invention
The utility model aims to: distribution network distribution equipment is many, and the fault monitoring means is few, and mainly add sensor and data transmission mode based on wireless communication at present, the monitoring economy is with low costs, and add the sensor, including temperature sensor, humidity transducer, conventional voltage transformer, current transformer etc. come the reflection equipment trouble information. However, network faults of the power distribution network, including grounding, short circuit, disconnection and the like, and equipment faults, including abnormality of main equipment such as a transformer, a switch and the like, need new monitoring technical means.
The technical scheme of the utility model is as follows: a power distribution network and equipment running state online identification method based on power line signals is characterized in that power line carrier communication equipment is installed at a power distribution network transformer and a power distribution switch, a background master station system coordinates to establish communication connection between the power line carrier equipment, the power line carrier communication equipment measures high-frequency impedance and signal noise of an installation position and uploads measured high-frequency impedance characteristic information and noise characteristic information to the background master station system, the background master station system identifies equipment and network faults according to the characteristic information, the background master station system stores the noise information of the high-frequency impedance measured by each carrier equipment, analyzes time change characteristics of the high-frequency impedance and the noise characteristic information, and judges the running states of the power distribution network and the equipment according to the relevance of the characteristic information between adjacent nodes.
Power line carrier communication equipment is installed at the positions of a distribution network transformer and a distribution switch, the carrier communication equipment installed at the distribution transformer is respectively connected into 7 carrier signal coupling equipment consisting of three phases at the high-voltage side and three phases at the low-voltage side of the transformer, and the carrier communication equipment installed at the distribution switch is respectively connected into six carrier signal coupling equipment consisting of three-phase incoming lines and three-phase outgoing lines of the switch.
The background master station system is used for coordinating power line carrier communication to establish communication connection, managing a power line carrier communication network, performing equipment remote configuration and network networking setting, monitoring the running state of the equipment, and coordinating the power line carrier communication equipment through the background system to establish communication connection.
The high-frequency impedance of the installation position is measured by scanning the impedance of discrete frequency points configured in the range of 30kHz-100MHz by the power line carrier communication equipment.
The signal noise of the installation position is measured, the noise frequency band of the installation position is analyzed by the power line carrier communication equipment, the running state of the equipment in the power distribution network is obtained through analysis and identification, the analysis result is uploaded to the background master station system, and the background master station system analyzes the noise incidence relation among all points.
Compared with the closest prior art, the technical scheme provided by the utility model has the following beneficial effects:
in the prior art, power line carrier communication equipment is mainly used for data transmission, noise measurement aims at eliminating noise and reducing influence on communication, and the power line carrier communication equipment is considered to be applied to communication quality. The utility model gives full play to the signal analysis in the power line carrier communication, applies the high-frequency impedance measurement and the power line communication noise measurement results to the state identification of equipment, especially analyzes and identifies the equipment and network state information implied by the noise information, and simultaneously makes full use of the measurement function of the carrier equipment to the high-frequency impedance to measure the high-frequency impedance and the communication noise, thereby realizing the online identification of the running states of the power distribution network and the equipment.
Drawings
Fig. 1 is a flowchart of a power distribution network and device status online identification method based on power line signals according to the present invention.
Fig. 2 is a schematic diagram of the high-frequency impedance test of the power line network access of the present invention.
Fig. 3 illustrates the principle of power line noise feature extraction and classification according to the present invention.
Detailed Description
The utility model provides a power distribution network and equipment fault identification method based on combination of high-frequency impedance measurement and high-frequency noise measurement of power line carrier equipment. The system realized by the method comprises a distribution line, a high-frequency cable, coupling equipment, power line carrier communication equipment and a background master station system. The utility model provides a new technical means for the online identification of the faults of the power distribution network and the equipment.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention relates to a method for online identifying the operating status of a power distribution network and devices based on power line signals, which comprises the following steps: power line carrier communication equipment is installed at the positions of a power distribution network transformer and a power distribution switch, a background master station system coordinates to establish communication connection between the power line carrier equipment, the coordination content comprises communication between the carrier equipment and the carrier equipment, communication at any time and the like, the coordination content is distributed and controlled by the background master station system, the power line carrier communication equipment measures high-frequency impedance of the installation position, the power line carrier communication equipment measures signal noise of the installation position, the power line carrier communication equipment uploads characteristic information of the background master station system, and the background master station system identifies equipment and network running states.
As shown in fig. 2, which is a schematic diagram of a high-frequency impedance test of power line network access, a left-side power line carrier device outputs AC that can generate a signal of 30kHz to 100MHz, the signal is injected into a power line from an AB terminal through a coupler, and the access impedance of the power line can be calculated by a voltage U and a current I of a test circuit. Wherein R1 is current limiting resistor, R2 is standard resistor, Z is power line network access impedance, and voltage U is measuredA、UBThe access impedance of the power line network can be calculated by the magnitude and the phase difference of the power line network.
UB＝-IR2 (2)
Changing I to-UB/R2Substituting the formula to obtain:
the value of the access impedance Z can thus be calculated from the known quantities.
Fig. 3 is a schematic diagram of power line noise feature extraction and classification. Wherein, S (t) is a sending signal, R (t) is a receiving signal, h (t) and h (f) are converted to reflect the transmission characteristics of the channel, the noise on the power line carrier channel is difficult to be directly and quantitatively expressed, and the noise has the characteristics of continuity, periodicity, randomness, variability and the like. The characteristics presented by the power line carrier channel noise are closely related to the place, time, power grid load equipment and other interference sources, and the noises are independent from one another. There are mainly five types of noise in the power line carrier channel, summarized as follows: colored background noise, narrow-band noise, power frequency synchronous periodic impulse noise, power frequency asynchronous periodic impulse noise and asynchronous impulse noise, and analyzing and identifying the equipment running state of the power distribution network:
the colored background noise spectrum occupies the entire power line communication bandwidth and is a combined interference signal formed by the summation of a plurality of lower-power noise sources connected to the power line. The colored background noise usually remains unchanged for a few seconds or minutes, sometimes even hours. The main source of the noise is interference of frequencies up to 30MHz generated by a large number of household appliances (such as dimming lamps, computers, refrigerators, induction cookers or hair dryers).
The narrow-band noise is noise similar to a sinusoidal amplitude modulation signal appearing in a power line carrier communication frequency range, the power spectral density of the noise is high, and the noise is mainly caused by crosstalk of medium-wave and short-wave radio signals on corresponding frequency domains, and in addition, the scanning synchronous signals of a television and a computer also generate the narrow-band noise.
Typical asynchronous impulse noise is caused by switching events on medium and low voltage grids, which are generally shaped like damped sine waves or superimposed damped sine waves. The pulse strength is related to the strength of the noise source, as well as the distance of the noise source from the receiving device.
The power frequency synchronous periodic impulse noise is mainly caused by switching of a switching device and a silicon controlled device in a switching power supply on a power grid, the repetition frequency of the impulse noise is 50Hz (60 Hz in America, Japan and the like) or integral multiple thereof, the noise duration is longer, the power is larger, the frequency coverage range is wider, and the power spectral density is reduced along with the rise of the frequency.
The repetition frequency of the power frequency asynchronous periodic impulse noise is generally 50-200kHz and is mainly generated by a computer display and a television receiver. The periodic frequency of the noise depends on the scanning frequency standard of computer displays and television receivers, and the frequencies are higher and higher as people pursue high-resolution image quality.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (2)
1. A power distribution network and equipment running state on-line identification method based on power line signals is characterized in that power line carrier communication equipment is installed at a power distribution network transformer and a power distribution switch, a background master station system coordinates to establish communication connection between the power line carrier equipment, the power line carrier communication equipment measures high-frequency impedance and signal noise at the installation position, the high-frequency impedance characteristic information and the noise characteristic information obtained by measurement are uploaded to a background master station system, the background master station system identifies equipment and network faults according to the high-frequency impedance characteristic information and the noise characteristic information, the background master station system stores the high-frequency impedance and noise information measured by each carrier equipment, analyzes the time change characteristics of the high-frequency impedance characteristic information and the noise characteristic information, and judges the running states of the power distribution network and the equipment according to the relevance of the high-frequency impedance characteristic information and the noise characteristic information between adjacent nodes;
the power distribution network transformer and the power distribution switch are provided with power line carrier communication equipment, the carrier communication equipment arranged at the power distribution transformer is respectively connected with 7 carrier signal coupling equipment consisting of three phases at the high-voltage side and three phases at the low-voltage side of the transformer, and the carrier communication equipment arranged at the power distribution switch is respectively connected with six carrier signal coupling equipment consisting of three-phase incoming lines and three-phase outgoing lines of the switch;
the high-frequency impedance of the installation position is measured, the power line carrier communication equipment is used for scanning the impedance of discrete frequency points configured in the range of 30kHz-100MHz, the signal noise of the installation position is measured, the noise frequency band of the installation position is analyzed by the power line carrier communication equipment, the running state of equipment in the power distribution network is obtained through analysis and identification, the analysis result is uploaded to a background master station system, and the background master station system analyzes the noise incidence relation among all points.
2. The power distribution network and equipment operation state online identification method based on power line signals as claimed in claim 1, wherein the background master station system coordinates power line carrier communication to establish communication connection, manages the power line carrier communication network, is used for device remote configuration and network networking setting, monitors equipment operation state, and coordinates the power line carrier communication equipment through the background master station system to establish communication connection.
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| CN112232381B (en) * | 2020-09-25 | 2024-03-01 | 国网上海市电力公司 | Model parameter post-processing method and device for dominant load parameter noise identification |
| CN113093049B (en) * | 2021-03-19 | 2023-10-03 | 威胜集团有限公司 | Fault arc location diagnosis method, device and computer readable storage medium |
| CN115128415B (en) * | 2022-08-26 | 2022-11-22 | 北京鼎诚鸿安科技发展有限公司 | Power distribution station room state testing platform and method |
| CN117559456B (en) * | 2024-01-11 | 2024-03-26 | 南京信息工程大学 | Method for identifying working state of power distribution network by using power distribution network measuring unit |
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