CN116930675A - DAS (distributed access system) target awareness technology-based cable line damage prevention monitoring system and method - Google Patents
DAS (distributed access system) target awareness technology-based cable line damage prevention monitoring system and method Download PDFInfo
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- 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
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Abstract
The application relates to the technical field of cable protection, and particularly discloses a cable line anti-damage monitoring system and method based on a DAS target perception technology, wherein the system comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring state data of a cable system submarine observation network in real time; the load management module is used for adjusting the input power of the cable system submarine observation network and judging whether the load of the submarine equipment is in an abnormal state or not; the fault analysis module is used for judging that a submarine cable section is a fault point when the current change value is abnormal while the relay state of the submarine cable section is switched. The application collects the state data of the cable system submarine observation network in real time based on the distributed optical fiber acoustic wave sensing technology, judges the running state of the cable system submarine observation network according to the collected state data, and can rapidly determine the fault position of the submarine cable so as to replace and maintain the fault submarine cable, thereby effectively preventing the submarine cable circuit from being damaged and ensuring the stability of the submarine cable circuit.
Description
Technical Field
The application particularly relates to the technical field of cable protection, in particular to a DAS (distributed access system) target perception technology-based cable line damage prevention monitoring system and method.
Background
Submarine cables are wires wrapped with insulating materials and laid on the sea and under rivers for telecommunication transmission. Modern submarine cables use fiber optics as the material to transmit telephone and internet signals. The submarine cable is divided into a submarine communication cable and a submarine power cable. Submarine communication cables are mainly used for communication services, are high in cost and have high confidentiality. The submarine power cable is mainly used for transmitting high-power electric energy underwater and has the same function as the underground power cable, but the application occasions and the laying modes are different. Since submarine cable engineering is widely recognized as a complex and difficult large-scale engineering by countries around the world, complex technology is applied from environmental detection, marine physical investigation, and design, manufacture and installation of cables, so that manufacturers of submarine cables are few in the world, mainly in countries such as norway, denmark, japan, canada, america, english, law, and the like, which provide laying technology in addition to manufacturing.
Distributed optical fiber sensing is a technology which has been developed rapidly in recent years, and uses backward scattered light transmitted by laser in an optical fiber to sense, and can measure, for example, temperature, strain, magnetic field and the like, and mainly comprises a distributed optical fiber temperature sensing technology based on backward raman scattering, a distributed optical fiber temperature strain sensing technology based on backward brillouin scattering (for measuring brillouin frequency shift) and a distributed optical fiber acoustic wave sensing system based on backward rayleigh scattering. The latter two are already applied to submarine cable monitoring due to the adoption of single-mode fibers, long monitoring distance and no need of power supply. The DAS can monitor micro vibration signals of the optical fiber in real time based on Rayleigh back scattering light, and is very suitable for the application of long-distance linear equipment of submarine optical cables (including submarine photoelectric composite cables);
because the telemetry and remote signaling modules cannot be installed in the submarine cable and the branch units thereof, the submarine cable has lower observability relative to a land power grid, and the special geographic position enables the submarine cable to have lower accessibility and be easily damaged, so that the submarine cable is difficult to monitor and is not timely to monitor, and the maintenance period is prolonged.
Disclosure of Invention
The application aims to provide a cable line anti-damage monitoring system and method based on a DAS target perception technology, which are used for solving the problems that in the background art, as a telemetry and remote signaling module cannot be installed in a submarine cable and a branch unit thereof, the submarine cable has lower observability relative to a land power grid, and a special geographic position enables the submarine cable to have lower accessibility and be easily damaged, so that the monitoring difficulty is high, the monitoring is not timely, and the maintenance period is prolonged.
In order to achieve the above purpose, the present application provides the following technical solutions:
a DAS target awareness technology-based cable line damage prevention monitoring system, comprising:
the system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring state data of a cable-based submarine observation network in real time, and the state data comprise power grid parameters based on submarine cables and real-time data based on submarine equipment;
the load management module is used for controlling the power supply on-off of each load of the submarine equipment; the system is also used for adjusting the input power of the cable-based submarine observation network, acquiring real-time data of each load of the submarine equipment based on the input voltage, comparing the real-time data of each load of the submarine equipment with a corresponding threshold value, and judging that the load of the submarine equipment with the real-time parameter is in an abnormal state when the real-time parameter exceeds the corresponding threshold value;
the fault analysis module is used for adjusting the input power of the cable-based submarine observation network to low power, switching the relay states of the main submarine cable, the branch units and the branch submarine cable sections, monitoring the change value of output current at the same time, and judging that a submarine cable section is a fault point when the current change value is abnormal while switching the relay state of a submarine cable section.
The power grid parameters used as a further scheme of the application comprise the length of each submarine cable section in the cable system submarine observation network, the submarine cable parameters of unit length, the topological structure of the submarine power grid and protection and alarm thresholds; the real-time data includes the on-off state quantity, voltage value and current value of the subsea equipment load.
As still further aspects of the application: the cable system submarine observation network is used for continuously conveying abundant electric energy from land to a large number of equipment distributed at the sea, and comprises a coast base station, a photoelectric composite communication sea cable network, an underwater base station and an observation platform, wherein high-voltage direct-current remote supply equipment in the coast base station is used for converting power frequency alternating-current electric energy provided by the land electric network into constant-voltage high-voltage direct-current electric energy, and the photoelectric composite communication sea cable network is used for conveying the power frequency alternating-current electric energy to each underwater base station through a main sea cable, a branch unit of the main sea cable and a branch sea cable.
As still further aspects of the application: the power grid parameters based on the submarine cable are acquired by adopting a data acquisition system based on a distributed optical fiber acoustic wave sensing technology, and the data acquisition system comprises a laser, an acousto-optic modulator, an EDFA amplifier, a circulator, a coupler, a detector, an acquisition card and an industrial personal computer.
As still further aspects of the application: the line signals acquired by the data acquisition system are as follows:
X k ＝{x ki (i＝1,ΛN)}
wherein X is k For the line signals acquired in the kth acquisition period, N represents the acquisition length of the data space, and the line signals are accumulated along the time axis to construct a space-time signal response matrix AA= { x of N-dimensional space and T-dimensional time ki (k＝1,Λ,T)；i＝1,Λ,N}。
As still further aspects of the application: the system further comprises a data storage module, wherein the data storage module is used for storing state data of the cable system submarine observation network and historical values of the state data, and the data storage module is connected with the data acquisition module, the load management module and the fault analysis module.
A DAS target awareness technology-based cable line damage prevention monitoring method comprises the following steps:
s10, acquiring state data of a cable-based submarine observation network in real time, wherein the state data comprise power grid parameters based on submarine cables and real-time data based on submarine equipment;
s20, judging the running state of the cable system submarine observation network based on the state data, judging whether the load of the submarine equipment is in an abnormal state when the running state is abnormal, if so, carrying out load alarm, otherwise, carrying out step S30;
s30, when the load of the submarine equipment is in a normal working state, the submarine cable of the cable system submarine observation network is in an abnormal state, and the submarine cable section in the abnormal state is positioned to determine a fault point.
As still further aspects of the application: in step S20, the method for determining whether the load of the submarine equipment is in an abnormal state includes the following steps:
s21, adjusting the input power of the cable system submarine observation network;
s22, acquiring real-time data of each load of the submarine equipment based on the input voltage;
s23, comparing the real-time data of each load of the submarine equipment with the corresponding threshold value, judging that the load of the submarine equipment with the real-time parameters is in an abnormal state and carrying out load alarm when the real-time parameters exceed the corresponding threshold value, otherwise, carrying out step S30.
As a still further aspect of the present application; in step S20, a load management method is further included, including the following steps:
step one, before the load of the submarine equipment is started, acquiring a real-time measured value of a power grid system, and analyzing the stability of the power grid after the load is started;
step two, judging whether the load meets stability constraint, if yes, starting the load, otherwise, performing step three;
and step three, optimizing power distribution of the power grid based on a load management algorithm.
As a still further aspect of the present application; in step S30, the method for locating the submarine cable segment in the abnormal state to determine the fault point includes the following steps:
s31, adjusting the input power of the cable-based submarine observation network to low power, wherein at the moment, the equipment loads of all the underwater base stations are in a stop operation state, and the output current of the high-voltage direct-current remote supply equipment is approximately equal to a fault current value;
s32, switching the relay states of the main sea cable, the branch units and the branch sea cable sections, and simultaneously monitoring the change value of the output current;
and S33, judging that the submarine cable section is a fault point when the current change value is abnormal while the relay state of the submarine cable section is switched.
Compared with the prior art, the application has the beneficial effects that: the application collects the state data of the cable system submarine observation network in real time based on the distributed optical fiber acoustic wave sensing technology, judges the running state of the cable system submarine observation network according to the collected state data, judges whether the submarine equipment load is in an abnormal state when the running state is abnormal, judges that the submarine cable of the cable system submarine observation network is in an abnormal state when the submarine equipment load is in a normal state, and positions the submarine cable section in the abnormal state by observing the current change value of the relay state of the submarine cable section so as to determine the fault point, thereby quickly determining the fault position of the submarine cable, facilitating the replacement and maintenance of the fault submarine cable, effectively preventing the submarine cable circuit from being damaged and ensuring the stability of the submarine cable circuit.
Drawings
FIG. 1 is a block diagram of a DAS target awareness technology-based cabling tamper-proof monitoring system.
Fig. 2 is a block diagram of a data acquisition system based on distributed optical fiber acoustic wave sensing technology in a DAS target sensing technology-based cable line anti-damage monitoring system.
FIG. 3 is a flow chart of a DAS target awareness technology-based cabling tamper-proof monitoring method.
Fig. 4 is a flowchart of step S20 in the DAS-based target awareness technology cabling tamper-proof monitoring method.
Fig. 5 is a flowchart of step S30 in the DAS-based target awareness technology cabling tamper-proof monitoring method.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be understood that although the terms first, second, etc. may be used in embodiments of the present application to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another.
Distributed optical fiber sensing is a technology which has been developed rapidly in recent years, and uses backward scattered light transmitted by laser in an optical fiber to sense, and can measure, for example, temperature, strain, magnetic field and the like, and mainly comprises a distributed optical fiber temperature sensing technology based on backward raman scattering, a distributed optical fiber temperature strain sensing technology based on backward brillouin scattering (for measuring brillouin frequency shift) and a distributed optical fiber acoustic wave sensing system based on backward rayleigh scattering. The latter two are already applied to submarine cable monitoring due to the adoption of single-mode fibers, long monitoring distance and no need of power supply. The DAS can monitor micro vibration signals of the optical fiber in real time based on Rayleigh back scattering light, and is very suitable for the application of long-distance linear equipment of submarine optical cables (including submarine photoelectric composite cables);
because the telemetry and remote signaling modules cannot be installed in the submarine cable and the branch units thereof, the submarine cable has lower observability relative to a land power grid, and the special geographic position enables the submarine cable to have lower accessibility and be easily damaged, so that the submarine cable is difficult to monitor and is not timely to monitor, and the maintenance period is prolonged.
Based on this, referring to fig. 1, in an embodiment of the present application, a cable line anti-damage monitoring system based on DAS target awareness technology includes:
the data acquisition module 10 is configured to acquire state data of the cable-based submarine observation network in real time, where the state data includes submarine cable-based power grid parameters and real-time data based on submarine equipment, and the power grid parameters mainly include lengths of submarine cable segments and submarine cable parameters of unit lengths thereof in the cable-based submarine observation network, a topological structure of the submarine power grid, and all protection and alarm thresholds; the real-time data mainly comprise analog quantities such as a switching state quantity, a voltage value, a current value and the like of a load of the submarine equipment;
in the embodiment of the application, the cable-based submarine observation network is used for continuously transmitting more abundant electric energy from land to a large number of devices distributed at the sea bottom, and mainly comprises a coast base station, a photoelectric composite communication submarine cable network, an underwater base station and an observation platform, wherein after high-voltage direct-current remote supply devices in the coast base station convert power frequency alternating-current electric energy provided by the land electric network into constant-voltage high-voltage direct-current electric energy, the photoelectric composite communication submarine cable network transmits the constant-voltage high-voltage direct-current electric energy to each underwater base station through a main submarine cable, a branch unit of the main submarine cable and a branch submarine cable, and a high-voltage direct-current converter in the underwater base station converts the high-voltage electric energy (usually-2 to-10 kV) into medium-voltage distribution electric energy (usually 300-400V) required by an observation device adapter, and then the observation device adapter converts the medium-voltage electric energy into low-voltage electric energy which is directly usable by the observation device;
therefore, it can be understood that the sea cable-based power grid parameters include the topology structure of the photoelectric composite communication sea cable network, the lengths of the main sea cable, the branch units of the main sea cable and the branch sea cable and the sea cable parameters of the unit length thereof, and the protection and alarm threshold values of the photoelectric composite communication sea cable network; real-time data based on the submarine equipment comprises analog quantities such as a coast base station, an underwater base station, switching state quantities of load equipment in an observation platform, a voltage value, a current value and the like;
further, the data acquired by the data acquisition module is sent to the data acquisition module through the submarine optical fiber communication system.
Referring to fig. 2, in the embodiment of the present application, a data acquisition system based on a distributed optical fiber acoustic wave sensing (DAS) is used to acquire a power grid parameter based on a submarine cable, where the data acquisition system includes a laser, an acousto-optic modulator, an EDFA amplifier, a circulator, a coupler, a detector, an acquisition card and an industrial personal computer, where the laser emits pulse light, shifts the frequency by 200MHz through the acousto-optic modulator, and amplifies the pulse light to the circulator 1 in 2 out into a detection optical fiber through the EDFA amplifier; the backward Rayleigh back scattered light of the detection fiber returns to the circulator 2 to enter and exit from the circulator 3 to reach the coupler; one coupler inputs backward Rayleigh scattered light, the other coupler splits the light by a laser, and the two split light forms beat light; the beat frequency light enters the detector to perform photoelectric conversion, then enters the acquisition card to perform sampling, and finally reaches the industrial personal computer to perform data processing so as to complete the whole data acquisition period;
further, in an embodiment of the present application, the line signal acquired by the data acquisition system is:
X k ＝{x ki (i＝1,ΛN)}
wherein X is k For the line signals acquired in the kth acquisition period, N represents the acquisition length of the data space, and the line signals are accumulated along the time axis to construct a space-time signal response matrix AA= { x of N-dimensional space and T-dimensional time ki (k＝1,Λ,T)；i＝1,Λ,N}。
The load management module 20 is used for controlling the power supply on-off of each load of the submarine equipment; the method is also used for adjusting the input power of the cable-based submarine observation network, acquiring real-time data of each load of the submarine equipment based on the input voltage, comparing the real-time data of each load of the submarine equipment with a corresponding threshold value, judging that the load of the submarine equipment with the real-time parameter is in an abnormal state when the real-time parameter exceeds the corresponding threshold value, otherwise, in a normal working state, wherein the condition that the load exceeds the threshold value represents that an electric power system of the observation network has abnormal states such as overvoltage, overcurrent and overtemperature, and the like, and sending out a warning or issuing a corresponding control instruction is needed;
the fault analysis module 30 is configured to adjust an input power of the cable-based submarine observation network to a low power, switch relay states of a main submarine cable, a branch unit and a branch submarine cable segment, monitor a change value of an output current at the same time, and determine that the submarine cable segment is a fault point when the change value of the current is abnormal while switching the relay state of the submarine cable segment.
Further, in the embodiment of the present application, the DAS-target-awareness-technology-based cable line damage prevention monitoring system further includes a data storage module 40, where the data storage module 40 is configured to store status data of the cable-based submarine observation network and a history value of the status data, and it is understood that the data storage module 40 is connected to the data acquisition module 10, the load management module 20, and the fault analysis module 30.
Referring to fig. 3-5, the application also discloses a cable line anti-damage monitoring method based on DAS target perception technology, comprising the following steps:
s10, acquiring state data of a cable-based submarine observation network in real time, wherein the state data comprise power grid parameters based on submarine cables and real-time data based on submarine equipment;
s20, judging the running state of the cable system submarine observation network based on the state data, judging whether the load of the submarine equipment is in an abnormal state when the running state is abnormal, if so, carrying out load alarm, otherwise, carrying out step S30;
further, in step S20 of the embodiment of the present application, the method for determining whether the load of the subsea equipment is in an abnormal state includes the following steps:
s21, adjusting the input power of the cable system submarine observation network;
s22, acquiring real-time data of each load of the submarine equipment based on the input voltage;
s23, comparing real-time data of each load of the submarine equipment with a corresponding threshold value, judging that the load of the submarine equipment with the real-time parameters is in an abnormal state and carrying out load alarm when the real-time parameters exceed the corresponding threshold values, otherwise, carrying out step S30;
still further, in step S20 of the embodiment of the present application, it should be noted that, the input power of the cable-based submarine observation network is the input power of the submarine power system, that is, the output power of the high-voltage direct-current remote-supply device in the coastal base station, and since the total length of the submarine cable is longer, the voltage loss and the power loss on the submarine cable must be considered, in order to ensure the stability of the electric power system of the observation network and to transmit as much electric energy to the seabed as possible, if the highest output voltage of the high-voltage direct-current remote-supply device is us, the range of the input voltage of the normal operation of the submarine converter is about 0.5 us-us; therefore, it is necessary to ensure that the input voltages of all the underwater base stations meet the limit condition;
assuming that the output power of the high-voltage direct-current far-supply device and the current carrying capacity of the submarine cable are not limiting factors, the carrying capacity of the cable submarine observation network is mainly determined by the output voltage of the high-voltage direct-current far-supply device, the power grid topology and the submarine cable resistance, and as the observation network is expanded and the load capacity is increased, or when the carrying capacity of the electric power system is reduced due to the fact that part of submarine cable segments are isolated due to faults, stability constraint cannot be met when the carrying capacity of the electric power system is reduced, and therefore limited energy of the observation network is utilized efficiently and a wider submarine observation area is covered as much as possible, and in step S20, a load management method is further included, comprising the following steps:
step one, before the load of the submarine equipment is started, acquiring a real-time measured value of a power grid system, and analyzing the stability of the power grid after the load is started;
step two, judging whether the load meets stability constraint, if yes, starting the load, otherwise, performing step three;
and step three, optimizing power distribution of the power grid based on a load management algorithm.
S30, when the load of the submarine equipment is in a normal working state, the submarine cable of the cable system submarine observation network is in an abnormal state, and the submarine cable section in the abnormal state is positioned to determine a fault point;
in step S30 of the embodiment of the present application, a method for locating a submarine cable segment in an abnormal state to determine a fault point includes the following steps:
s31, adjusting the input power of the cable-based submarine observation network to low power, wherein at the moment, the equipment loads of all the underwater base stations are in a stop operation state, and the output current of the high-voltage direct-current remote supply equipment is approximately equal to a fault current value;
s32, switching the relay states of the main sea cable, the branch units and the branch sea cable sections, and simultaneously monitoring the change value of the output current;
and S33, judging that the submarine cable section is a fault point when the current change value is abnormal while the relay state of the submarine cable section is switched.
The electrical faults can be divided into ground faults and open circuits, wherein the ground faults can be divided into low-resistance faults and high-resistance faults; when the ground fault occurs, a certain fault current is formed at the fault point, and particularly when the low-resistance fault occurs, the high-voltage direct-current remote supply equipment can reduce the output voltage due to output current limiting, so that automatic protection is realized.
Further, some embodiments may include a storage medium having a program for executing the method described in the present specification on a computer, on which at least one instruction, at least one program, a code set, or an instruction set is stored, which when loaded and executed by a processor, implements the steps of the above-described method embodiments, examples of the computer-readable recording medium include hardware devices specifically configured for storing and executing program commands, magnetic media such as hard disks, floppy disks, and magnetic tape, optical recording media such as CD-ROMs, DVDs, magneto-optical media such as floppy disks, and ROMs, RAMs, flash memories, and the like. Examples of program commands may include machine language code written by a compiler, high-level language executed by a computer using an interpreter, or the like.
Those of ordinary skill in the art will appreciate that implementing all or a portion of the processes of the above-described embodiments may be accomplished by at least one instruction, at least one program, code set, or instruction set that may be executed by associated hardware, the at least one instruction, at least one program, code set, or instruction set may be stored in a non-transitory computer-readable storage medium, the at least one instruction, at least one program, code set, or instruction set, when executed, may comprise processes of embodiments of the above-described methods. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory.
In summary, the application collects the state data of the cable system submarine observation network in real time based on the distributed optical fiber acoustic wave sensing technology, judges the running state of the cable system submarine observation network according to the collected state data, judges whether the submarine equipment load is in an abnormal state when the running state is abnormal, judges that the submarine cable of the cable system submarine observation network is in an abnormal state when the submarine equipment load is in a normal state, and positions the submarine cable section in the abnormal state by observing the current change value of the relay state of the submarine cable section so as to determine the fault point, thereby quickly determining the fault position of the submarine cable, facilitating the replacement and maintenance of the fault submarine cable, effectively preventing the submarine cable circuit from being damaged and ensuring the stability of the submarine cable circuit.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (9)
1. DAS target awareness technology-based cable line damage prevention monitoring system is characterized by comprising:
the system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring state data of a cable-based submarine observation network in real time, and the state data comprise power grid parameters based on submarine cables and real-time data based on submarine equipment;
the load management module is used for controlling the power supply on-off of each load of the submarine equipment; the system is also used for adjusting the input power of the cable-based submarine observation network, acquiring real-time data of each load of the submarine equipment based on the input voltage, comparing the real-time data of each load of the submarine equipment with a corresponding threshold value, and judging that the load of the submarine equipment with the real-time parameter is in an abnormal state when the real-time parameter exceeds the corresponding threshold value;
the fault analysis module is used for adjusting the input power of the cable-based submarine observation network to low power, switching the relay states of the main submarine cable, the branch units and the branch submarine cable sections, monitoring the change value of output current at the same time, and judging that a submarine cable section is a fault point when the current change value is abnormal while switching the relay state of a submarine cable section.
2. The DAS-target-awareness-technology-based cabling anti-damage monitoring system of claim 1, wherein the grid parameters include lengths of sea cable segments in the cable-based submarine observation network and sea cable parameters per unit length thereof, a topological structure of the submarine grid, and protection and alarm thresholds; the real-time data includes the on-off state quantity, voltage value and current value of the subsea equipment load.
3. The DAS-target-awareness-technology-based cable line anti-damage monitoring system according to claim 2, wherein the cable-based submarine observation network is used for continuously conveying abundant electric energy from land to a large number of devices distributed at the sea bottom, including coast base stations, photoelectric composite communication submarine cable networks, underwater base stations and observation platforms, and after the high-voltage direct-current remote supply devices in the coast base stations convert power frequency alternating-current electric energy provided by the land electric network into constant-voltage high-voltage direct-current electric energy, the photoelectric composite communication submarine cable networks are conveyed to each underwater base station through main submarine cables, branch units of the main submarine cables and branch submarine cables.
4. The DAS-target-awareness-technology-based cable line anti-damage monitoring system according to claim 3, wherein the submarine cable-based power grid parameters are acquired by a distributed fiber acoustic wave sensing-based data acquisition system, and the data acquisition system comprises a laser, an acousto-optic modulator, an EDFA amplifier, a circulator, a coupler, a detector, an acquisition card and an industrial personal computer.
5. The DAS-target-awareness-technology-based cable line damage prevention monitoring system of claim 4, wherein the line signals acquired by the data acquisition system are:
X k ＝{x ki (i＝1,ΛN)}
wherein X is k For the line signals acquired in the kth acquisition period, N represents the acquisition length of the data space, and the line signals are accumulated along the time axis to construct a space-time signal response matrix AA= { x of N-dimensional space and T-dimensional time ki (k＝1,Λ,T)；i＝1,Λ,N}。
6. The DAS-target-awareness-technology-based cabling tamper-resistant monitoring system of claim 1, further comprising a data storage module configured to store status data of the cable-based subsea observation network and historical values of the status data, wherein the data storage module is coupled to the data acquisition module, the load management module, and the failure analysis module.
7. A DAS target perception technology-based cable line damage prevention monitoring method is characterized by comprising the following steps:
s10, acquiring state data of a cable-based submarine observation network in real time, wherein the state data comprise power grid parameters based on submarine cables and real-time data based on submarine equipment;
s20, judging the running state of the cable system submarine observation network based on the state data, judging whether the load of the submarine equipment is in an abnormal state when the running state is abnormal, if so, carrying out load alarm, otherwise, carrying out step S30;
s30, when the load of the submarine equipment is in a normal working state, the submarine cable of the cable system submarine observation network is in an abnormal state, and the submarine cable section in the abnormal state is positioned to determine a fault point.
8. The DAS-target-awareness-technology-based cabling tamper-proof monitoring method of claim 7, wherein the method for determining whether the subsea equipment load is in an abnormal state in step S20 comprises the steps of:
s21, adjusting the input power of the cable system submarine observation network;
s22, acquiring real-time data of each load of the submarine equipment based on the input voltage;
s23, comparing the real-time data of each load of the submarine equipment with the corresponding threshold value, judging that the load of the submarine equipment with the real-time parameters is in an abnormal state and carrying out load alarm when the real-time parameters exceed the corresponding threshold value, otherwise, carrying out step S30.
9. The DAS-target-awareness-technology-based cabling tamper-evident monitoring method of claim 8, wherein in step S30, the submarine cable segment in an abnormal state is located to determine a failure point, comprising the steps of:
s31, adjusting the input power of the cable-based submarine observation network to low power, wherein at the moment, the equipment loads of all the underwater base stations are in a stop operation state, and the output current of the high-voltage direct-current remote supply equipment is approximately equal to a fault current value;
s32, switching the relay states of the main sea cable, the branch units and the branch sea cable sections, and simultaneously monitoring the change value of the output current;
and S33, judging that the submarine cable section is a fault point when the current change value is abnormal while the relay state of the submarine cable section is switched.
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