CN209120179U - A kind of signal coupled system of subsea DC power transmission cable - Google Patents
A kind of signal coupled system of subsea DC power transmission cable Download PDFInfo
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- CN209120179U CN209120179U CN201920063726.8U CN201920063726U CN209120179U CN 209120179 U CN209120179 U CN 209120179U CN 201920063726 U CN201920063726 U CN 201920063726U CN 209120179 U CN209120179 U CN 209120179U
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Abstract
The utility model discloses a kind of signal coupled system of subsea DC power transmission cable, which includes: DC transmission system circuit, signal modulation coupling circuit and signal demodulating circuit；The signal modulation coupling circuit, for carrying out processing modulation to systems baseband signal, high-frequency carrier signal is generated, and the high-frequency carrier signal is loaded into the direct current transportation conducting wire of the DC transmission system circuit, to give the signal demodulating circuit by the direct current transportation wire transmission；The signal demodulating circuit, high-frequency carrier signal for being transmitted to the direct current transportation conducting wire carries out frequency-division filter, obtains filtering signal, and carry out reduction treatment to the filtering signal, baseband signal after baseband signal after being restored, and the output reduction.The utility model directly transmits high-frequency carrier signal using direct current transportation conducting wire, to eliminate the cost of repeated construction signal transmission passage, reduces communication channel construction cost.
Description
Technical field
The utility model relates to a kind of couplings of the signal of electric energy transmission technology field more particularly to subsea DC power transmission cable
System.
Background technique
With the progress of high-power high voltage direct current power electronics technology of transmission of electricity, high-power high-efficiency HVDC transmission system
It is greatly promoted the development of electric energy transmission field.Wherein, HVDC transmission system is applied to the power supply of undersea system equipment,
The development of the detection of its seabed resources and research is greatly facilitated.
Currently, copper conductor cable length is up to hundreds of kms, in particular for structure in distant-range high voltage direct current transmission system
The optical fiber copper conductor of the channels such as optical fiber is built, cost is extremely expensive.Specifically, existing distant-range high voltage direct current transmission system is logical
Frequently with optical communication equipment, signal transmission is carried out by the compound copper cable of optical fiber, transmission signal data volume is big, strong interference immunity
And long transmission distance, but needing individually to establish communications circuit, communication channel construction cost is high.
Utility model content
It is existing to solve in view of this, the present invention provides a kind of signal coupled system of subsea DC power transmission cable
Technology medium and long distance subsea DC Transmission Lines problem with high costs.
In a first aspect, the utility model embodiment provides a kind of signal coupled system of subsea DC power transmission cable, packet
It includes: DC transmission system circuit, signal modulation coupling circuit and signal demodulating circuit；
The signal modulation coupling circuit generate high-frequency carrier signal for carrying out processing modulation to systems baseband signal,
And the high-frequency carrier signal is loaded into the direct current transportation conducting wire of the DC transmission system circuit, with defeated by the direct current
Electric lead is transferred to the signal demodulating circuit；
The signal demodulating circuit, the high-frequency carrier signal for being transmitted to the direct current transportation conducting wire carry out frequency dividing filter
Wave obtains filtering signal, and carries out reduction treatment to the filtering signal, the baseband signal after being restored, and output institute
Baseband signal after stating reduction.
Optionally, the DC transmission system circuit includes: that bank base power supply, under-water DC power supply and direct current transportation are led
Line；One end of the direct current transportation conducting wire connects the bank base power supply and the signal modulation coupling circuit, the direct current transportation
The other end connection under-water DC power supply of conducting wire and the signal reconcile circuit；The direct current transportation conducting wire is used for the bank
The HVDC transmission that reference power supply provides is to the under-water DC power supply；The under-water DC power supply, for the high pressure
Direct current carries out decompression processing, generates low-voltage DC, wherein the voltage of the high voltage direct current is higher than the low-voltage DC
Voltage.
Optionally, the signal modulation coupling circuit include signal modulation driving circuit, carrier generating circuit and resonance
Coupling circuit；One end of the carrier generating circuit connects the signal modulation driving circuit, the carrier generating circuit it is another
One end connects the resonant coupling circuit；The signal modulation driving circuit, for being carried out to the systems baseband signal received
Modulation generates pulse width modulating signal, and believes according to pulse width modulating signal to the carrier generating circuit output driving
Number；The carrier generating circuit, for generating carrier signal according to the driving signal, and by the carrier signal transmission to institute
State resonant coupling circuit；The resonant coupling circuit generates high frequency carrier letter for carrying out power amplification to the carrier signal
Number, and the high-frequency carrier signal is loaded into the direct current transportation conducting wire.
Optionally, the carrier generating circuit includes transistor unit, described in the control terminal connection of the transistor unit
Signal modulation driving circuit, and the output end of the transistor unit connects the resonant coupling circuit；The resonance coupling electricity
Road includes isolating transformer, and the resonant coupling circuit is connect by the isolating transformer with the direct current transportation conducting wire.
Optionally, the signal demodulating circuit includes: signal block isolating circuit, signal selective frequency filter circuit and signals revivification electricity
Road；One end of the signal block isolating circuit connects the direct current transportation conducting wire, and the other end of the signal block isolating circuit connects institute
Signal selective frequency filter circuit is stated, the high-frequency carrier signal for being transmitted the direct current transportation conducting wire is transferred to the signal choosing
Frequency filter circuit；The signal selective frequency filter circuit, for carrying out frequency-division filter, production filtering letter to the high-frequency carrier signal
Number, and the filtering signal is exported to the signals revivification circuit；The signals revivification circuit, for the filtering signal
Carry out reduction treatment, the baseband signal after the baseband signal after being restored, and the output reduction.
Optionally, the signal selective frequency filter circuit includes: resonator filter circuit unit and precise rectification circuit unit；Institute
Resonator filter circuit unit is stated to connect with the signal block isolating circuit, it is miscellaneous for filtering out the route in the high-frequency carrier signal
Wave generates filtering signal, and the filtering signal is exported to the precise rectification circuit unit；The precise rectification circuit list
Member is exported for rectifying to the filtering signal, and by the filtering signal after rectification to the signals revivification circuit.
Optionally, the resonator filter circuit unit includes that resonator, filter capacitor, resonator, filter inductance and resonance adjust electricity
Resistance；One end that the resonance adjusts resistance connects the resonator, filter capacitor, and the other end that the resonance adjusts resistance connects institute
State resonator, filter inductance；First output end of the signal block isolating circuit connects resonator, filter capacitor, and signal blocking electricity
The second output terminal on road connects the resonator, filter inductance.
Optionally, the signal block isolating circuit includes capacitance and isolating transformer；The primary side of the isolating transformer
It is connect by the capacitance with direct current transportation conducting wire, the secondary side of the isolating transformer and the resonator filter circuit unit
Connection.
Optionally, the signal selective frequency filter circuit further include: conditioning filter circuit unit；The conditioning filter circuit list
The input terminal of member is connect by the resonator filter circuit unit with the signal block isolating circuit, and the conditioning filter circuit list
The output end of member is connect with precise rectification circuit unit.
Optionally, the signal modulation driving circuit includes: digital signal modulated circuit unit and signal drive circuit list
Member；The input terminal of the signal drive circuit unit connects the digital signal modulated circuit unit, the signal drive circuit
The output end of unit connects the carrier generating circuit.
The utility model carries out processing modulation to systems baseband signal by signal modulation coupling circuit, and by the height of generation
Frequency carrier signal is loaded into the direct current transportation conducting wire of DC transmission system circuit, directly to transmit height using the direct current transportation conducting wire
Frequency carrier signal reduces logical without individually building communication loop to eliminate the cost of repeated construction signal transmission passage
Believe channel build cost, that is, solves the problems, such as that existing remote subsea DC Transmission Lines are with high costs.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the signal coupled system of subsea DC power transmission cable of the utility model embodiment；
Fig. 2 is a kind of subsea DC power transmission cable suitable for the transmission of electricity of remote subsea DC in the utility model example
The structural block diagram of signal coupled system；
Fig. 3 is a kind of structural schematic diagram of DC transmission system circuit in the utility model example；
Fig. 4 is a kind of structural schematic diagram of signal modulation coupling circuit in the utility model example；
Fig. 5 is the schematic diagram of the signal modulation coupling circuit 4 road pwm signals of generation in one example of the utility model；
Fig. 6 is the process wave that the utility model one exemplary signal modulation coupling circuit are modulated and generate when coupling
The schematic diagram of shape；
Fig. 7 is the single channel decoding circuit exemplary diagram of one of the utility model example signal demodulating circuit；
Fig. 8 is the signal coupled system decoding circuit waveform of the subsea DC power transmission cable in one example of the utility model
Figure.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
With the development intelligently transmitted electricity, DC transmission system bank base power supply and underwater power source signal transmission reliability and
Real-time seems particularly significant.Therefore, a kind of cable signal coupled system suitable for the transmission of electricity of remote subsea DC is constructed
The higher academic and engineering value of research tool.
Submarine cable Transmission system signal transmission at present is primarily present two ways: one is passed through using optical communication equipment
The compound copper cable of optical fiber carries out signal transmission, transmits big signal data volume, strong interference immunity and long transmission distance, but need
Individually establish that communications circuit, communication protocol is complicated, real-time communication is poor；Another kind is carried out using power line carrier mode
Transmission, but carrier communication at present is chiefly used in short distance, low-voltage power transmission line occasion.Specifically, with power line carrier communication
Development, power line carrier communication is in low-voltage direct power transmission network using very extensive.Power line carrier generation at present is adopted mostly
Disadvantage low with carrier wave formation efficiency with the form of triode amplifier, that power consumption is big and transmission range is close.In addition, high
The difficult point that signal interference is strong, carrier communication difficulty is big, also applies as restriction carrier communication maturation is pressed in DC power transmission line.
It is with high costs in order to solve prior art medium and long distance subsea DC Transmission Lines, and realize complexity, in real time
Property it is poor the problems such as, the utility model provides a kind of signal coupled system of new subsea DC power transmission cable, logical in conjunction with carrier wave
Letter technology directly transmits signal by direct current transportation conducting wire.
Referring to Fig.1, a kind of signal coupled system of subsea DC power transmission cable of the utility model embodiment is shown
Structural block diagram.The signal coupled system of the subsea DC power transmission cable is suitably adapted for direct current transportation submarine cable signal and mutually transmits
It in occasion, can specifically include: DC transmission system circuit 110, signal modulation coupling circuit 120 and signal demodulating circuit 130.
Wherein, the output end of signal modulation coupling circuit 120 is connected to the direct current transportation conducting wire of DC transmission system circuit 110, is used for
Processing modulation carried out to systems baseband signal, generates high-frequency carrier signal, and the high-frequency carrier signal is loaded into described straight
The direct current transportation conducting wire of transmission system circuit 110 is flowed, to give the signal demodulating circuit by the direct current transportation wire transmission.
The high-frequency carrier signal that signal demodulating circuit 130 is used to transmit the direct current transportation conducting wire carries out frequency-division filter, is filtered
Wave signal, and reduction treatment is carried out to the filtering signal, after the baseband signal after being restored, and the output reduction
Baseband signal.
To sum up, the signal coupled system of the subsea DC power transmission cable in the utility model embodiment, passes through signal modulation
Coupling circuit 120 carry out processing modulation to systems baseband signal, and the high-frequency carrier signal of generation is loaded into DC power transmission system
The direct current transportation conducting wire of system circuit 110, directly to transmit high-frequency carrier signal using the direct current transportation conducting wire, without individually building
It is at high cost to solve existing remote subsea DC Transmission Lines to reduce communication channel construction cost for communication loop
High problem.
As an example of the utility model, as shown in Fig. 2, being suitable for the subsea DC of remote subsea DC transmission of electricity
The signal coupled system of power transmission cable may include: the remote direct current transportation circuit as DC transmission system circuit 110, letter
Number modulation coupling circuit 120 and signal demodulating circuit 130.Remote direct current transportation circuit can be by bank base power supply by three-phase
AC conversion is high voltage direct current electric energy, and can be used by direct current transportation wire transmission to undersea device.Wherein, remote straight
Flowing power delivery circuit can be using copper conductor as direct current transportation conducting wire, i.e. direct current transportation in DC transmission system circuit 110 is led
Line can be direct current transportation copper conductor.
Specifically, remote direct current transportation circuit can be connected with direct current transportation copper conductor, for generating high voltage direct current
Electricity can be adjusted powering load in the underwater power source portvoltage that terminal is connected to direct current transportation copper conductor.Signal
Modulation coupling circuit 120 can be connected with the bank base power end in remote direct current transportation circuit, for systems baseband signal
Processing modulation is carried out, generates the high-frequency signal of combination frequency, and can be loaded onto straight using the high-frequency signal as high-frequency carrier signal
In stream transmission of electricity copper conductor, so as to which high-frequency carrier signal is transferred to signal demodulating circuit by the direct current transportation copper conductor
130 carry out reduction treatment.
Signal demodulating circuit 130 is by carrying out frequency-division section filtering to direct current transportation copper conductor high-frequency carrier signal, and through believing
Number processing circuit is reduced into baseband signal to get to the baseband signal after reduction and output.For example, signal demodulating circuit 130 can
To pass through signal blocking and isolation circuit, multi signal frequency-selecting and multichannel band logical active filter circuit and level comparison circuit to letter
It number is restored, the baseband signal after being restored, and the baseband signal after reduction is exported to reception signal terminal, realized and carry
Wave communication.
As it can be seen that the signal coupled system of the subsea DC power transmission cable in this example is transmitted electricity suitable for remote subsea DC
Occasion, and using coupling carrier system, building coupling channel, eliminates in the high-tension line of remote direct current transportation circuit
The cost of repeated construction signal transmission passage, to reduce remote subsea DC Transmission Lines cost.
Furthermore, the DC transmission system circuit 110 in the utility model embodiment may include: bank base power supply
111, under-water DC power supply 112 and direct current transportation conducting wire 113.One end of the direct current transportation conducting wire 113 connects the bank base
The other end of power supply 111 and the signal modulation coupling circuit 120, the direct current transportation conducting wire 113 connects under-water DC power supply
112 and the signal reconcile circuit 130.In the concrete realization, the direct current transportation conducting wire 113 is used for the bank base power supply
111 HVDC transmissions provided are to the under-water DC power supply 112.The under-water DC power supply 112, for the height
Straightening galvanic electricity carries out decompression processing, generates low-voltage DC, wherein the voltage of the high voltage direct current is higher than the low-voltage direct
The voltage of electricity.
In the concrete realization, DC transmission system circuit 110 can convert height for three-phase alternating current by bank base power supply
Direct current energy to undersea device is pressed to use.Specifically, bank base power end 111 can use AC-DC module mode, by three-phase mains
High voltage bus voltage is risen to, i.e. offer high voltage direct current supplies electricity to remote direct current transportation copper conductor；Underwater power source end 112 can pass through
Remote direct current transportation copper conductor and the current loop of sea return building are energized to undersea device, specifically, DC- can be used
DC modular manner, the high voltage direct current that high voltage bus is transmitted are depressured, and such as drop tooth to six hectovolts spy (600V), for equipment
It uses.
For example, one or more AC- can be passed through as shown in figure 3, bank base power end 111 can be used as bank base power circuit
The three-phase alternating current (Alternating Curren, AC) of access is converted to direct current (Direct by DC power module
Current, DC), and to generate high voltage direct current, and can pass through by the boost in voltage of direct current to high voltage bus voltage is risen to
Its cable power supply circuit transmission connected is to underwater power source circuit.Wherein, the remote direct current that bank base power end is connected is defeated
Electrolytic copper conducting wire can be used as a high voltage bus in cable power supply circuit, and the sea between bank base power end and underwater power source end
Water can be used as another high voltage bus in cable power supply circuit, to form sea return.In addition, as underwater power source electricity
The underwater power source end 112 on road can be adjusted the voltage of high voltage direct current by one or more DC-DC power modules, with
It is load supplying based on voltage adjusted.The load may include underwater equipment, such as undersea device, and the utility model is implemented
Example to this with no restriction.
As it can be seen that the signal coupled system of the subsea DC power transmission cable in the utility model embodiment is suitable for the direct current system
System uses, and the signal carrier mode for being applicable to the remote route of any high pressure is transmitted.For example, the utility model embodiment
In subsea DC power transmission cable signal coupled system can using digital frequency deviation key control mode transmit signal.Specifically,
Signal modulation coupling circuit in the signal coupled system of subsea DC power transmission cable can use Inductivity-Inductivity-capacitor (LLC)
Series resonance mode carries out carrier modulation, and in combination with LLC resonance topological high efficiency, transmission energy is big, high reliability and coupling
The good feature of sine degree is closed to couple the features such as sine degree is good, the high-frequency carrier signal of generation is loaded directly into direct current transportation and is led
Line 113 is transmitted, and is met remote, high voltage and high reliablity transmission demand, is overcome existing carrier communication and be only capable of using
In the short distance, low-voltage power transmission line occasion the shortcomings that, the application range of power line carrier communication mode is expanded.
In an alternative embodiment of the utility model, above-mentioned signal modulation coupling circuit 120 may include signal tune
Driving circuit 121, carrier generating circuit 122 and resonant coupling circuit 123 processed.As shown in Fig. 2, the carrier generating circuit
122 one end connects the signal modulation driving circuit 121, and the other end of the carrier generating circuit 122 connects the resonance
Coupling circuit 123.The signal modulation driving circuit 121 generates arteries and veins for being modulated to the systems baseband signal received
Rush bandwidth modulation signals, and according to pulse width modulating signal to 122 output drive signal of carrier generating circuit.The load
Wave generation circuit 122 for generating carrier signal according to the driving signal, and gives the carrier signal transmission to the resonance
Coupling circuit 123.Resonant coupling circuit 113 can be used for carrying out power amplification to the carrier signal, generate high frequency carrier letter
Number, and the high-frequency carrier signal is loaded into the direct current transportation conducting wire.As it can be seen that the utility model embodiment can pass through load
Wave generation circuit 122 generates the carrier signal of combination frequency, and can will have high-frequency load by resonant coupling circuit 123
Wave signal (i.e. high-frequency carrier signal), which is coupled to direct current transportation conducting wire, to be transmitted, easy to accomplish, is solved existing power line and is carried
Wave generates the problem big using carrier communication difficulty caused by triode amplifier form, and the performance of antinoise and anti-attenuation
It is good, overcome that signal interference in HVDC transmission line in the prior art is strong and carrier communication difficulty caused by carrier communication
Using difficult point, expand carrier communication application range.
Optionally, the signal modulation driving circuit in the utility model embodiment may include: digital signal modulated circuit
Unit and signal drive circuit unit；The input terminal of the signal drive circuit unit connects the digital signal modulated circuit list
The output end of member, the signal drive circuit unit connects the carrier generating circuit.Wherein, digital signal modulated circuit unit
It specifically can be used for being modulated the systems baseband signal received, generate pulse width modulating signal, and can be by the arteries and veins
It rushes bandwidth modulation signals and exports and give signal drive circuit unit, allow signal drive circuit unit according to the pulse width tune
Signal output drive signal processed.Signal drive circuit unit is used for the pulse width according to the output of digital signal modulated circuit unit
Modulated signal, Xiang Suoshu carrier generating circuit output drive signal.
For example, signal modulation coupling circuit 120 can be used as transmits electricity suitable for remote subsea DC in conjunction with above-mentioned example
The signal modulation and coupling unit of the signal coupled system of cable, the signal modulation driving in the signal modulation coupling circuit 120
Circuit 121 may include digital signal modulated circuit unit 410 and signal drive circuit unit 420, and the signal modulation couples
Carrier generating circuit 122 and resonant coupling circuit 123 in circuit 120 can integrate in the same circuit unit, such as Fig. 4 institute
Show, carrier generating circuit 122 and resonant coupling circuit 123 can integrate the carrier wave in signal modulation coupling circuit 120 occur and
In isolation circuit unit 430.
In this example, signal modulation coupling circuit 120 can generate the carrier wave letter of different frequency using LLC full-bridge topology
Number be coupled to direct current transportation copper conductor, and can by shift keying modulation mode by modulates baseband signals into high frequency carrier.Tool
Body, can by the micro-control unit (Microcontroller Unit, MCU) in digital signal modulated circuit unit 410,
Systems baseband signal modulation is modulated into (Pulse Width Modulation, PWM) at the pulse width of four road down tube complementations
Signal, PWM1, PWM2, PWM3 and PWM4 as shown in Figure 4 can then pass through the core in signal drive circuit unit 420
Piece is transmitted to the control terminal of carrier wave generation and the transistor unit in isolation circuit unit 430, so that carrier wave occurs and isolation electricity
Road unit 430 generates high-frequency carrier signal, and the high-frequency carrier signal of generation is loaded into direct current transportation conducting wire and is transmitted.
Wherein, carrier wave occur and isolation circuit unit 430 in transistor unit may include one or more transistors, but such as the crystalline substance
Body pipe be metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor,
MOSFET), be also possible to other kinds of transistor, this example to this with no restriction.
Furthermore, the carrier generating circuit 122 in the utility model embodiment includes transistor unit, the crystal
The control terminal of pipe unit connects the signal modulation driving circuit 121, and the output end connection of the transistor unit is described humorous
Vibration coupling circuit 123.The resonant coupling circuit 123 may include isolating transformer Tp, and the resonant coupling circuit 123 passes through
The isolating transformer Tp is connect with the direct current transportation conducting wire 113.Specifically, the utility model embodiment can be using load
Transistor unit in wave generation circuit 122 constitutes LLC full-bridge topology, and then can use LLC full-bridge topology and generate different frequencies
The carrier signal of rate is coupled in direct current transportation conducting wire 113, and can shift keying modulation mode by modulates baseband signals into high frequency
In carrier wave, to realize that signal transmits in the way of power line carrier.
For example, the low cost that signal drive circuit unit 420 can be constituted using chip R2113 is driven in conjunction with above-mentioned example
Dynamic circuit, so as to digital signal modulation circuit unit 410 is exported by chip I R2113 pulse width modulating signal into
Row processing generates the driving signal for being transferred to carrier wave generation and isolation circuit unit 430.The driving signal can be used for driving load
Wave occurs and middle one or more transistors of isolation circuit unit 430, can specifically include and is transferred to one or more crystal
The driving signal of pipe such as may include: the control for being transmitted to the first field-effect tube Q1 in carrier wave generation and isolation circuit unit 430
The driving signal G1 at end, the driving for being transmitted to the control terminal of the second field-effect tube Q2 in carrier wave generation and isolation circuit unit 430
Signal G2, it is transmitted to the driving signal G3 of the control terminal of third field-effect tube Q3 in carrier wave generation and isolation circuit unit 430, passes
Transport to the driving signal G4 of the control terminal of the 4th field-effect tube Q4 in carrier wave generation and isolation circuit unit 430.
Wherein, carrier wave occur and isolation circuit unit 430 in inductance Lp, capacitor Cp and isolating transformer Tp may be constructed
One classical LLC resonant tank.Carrier wave generation and isolation circuit unit 430 are loaded into the high frequency carrier letter of direct current transportation conducting wire
Number frequency can be determined by inductance Lp, capacitor Cp and isolating transformer Tp, can such as be determined according to following system equations:
It should be noted that the Lm in system equations can be the magnetizing inductance of isolating transformer Tp, Lr can be transformation
The equivalent leakage inductance of device primary side, f1 can be high level signal carrier frequency, and f2 can be low level signal carrier frequency, and fm can be
Emergency parachute carrier frequency.For example, can be 250kHz in f1 frequency, f2 frequency can be 1MHz, and fm frequency can be
500kHz etc..
In the concrete realization, systems baseband signal can pass through the Digital Logic in digital signal modulated circuit unit 410
Circuit selection needs the frequency of carrier signal that issues, it can MCU controller in digital signal modulated circuit unit 410 can be with
Based on above system formula, the systems baseband signal received is modulated, generates 4 road pwm signals, and drive by signal
This corresponding driving signal of 4 road pwm signal is transferred to each crystal into carrier wave generation and isolation circuit unit 430 by circuit unit
The control terminal of pipe is transmitted to the first field-effect tube Q1, the second field-effect tube Q2, third field-effect tube Q2 and the 4th field-effect
The control terminal of pipe Q4 generates corresponding high-frequency carrier signal to trigger carrier wave generation and isolation circuit unit 430, and is loaded into straight
Stream transmission pressure is transmitted.
For example, the signal modulation coupling circuit in the utility model embodiment can use switching mode Inductivity-Inductivity-capacitor
(LLC) series resonant converter, by modulates baseband signals at the high_frequency sine wave of different frequency range；And it can be isolated by high-frequency and high-voltage
The carrier signal is loaded onto remote submarine cable by transformer.Specifically, as shown in figure 5, including in systems baseband signal
Low level " 0 ", high level " 1 ", in emergency parachute " EM " in the case where the frequency signal of corresponding three kinds of different conditions, baseband signal
The frequency of carrier signal for needing to issue can be selected by the Digital Logical Circuits in MCU controller, then be generated using PWM
Circuit is divided into the control terminal that 4 road pwm signals reach Q1-Q4, is carried with forming corresponding inversion by inverter bridge composed by Q1-Q4
Wave, also that is, passing through in low level " 0 ", high level " 1 ", emergency parachute " EM " when the frequency signal of corresponding three kinds of different conditions
The carrier wave that respective characteristic can be respectively formed after high frequency carrier modulation forms respective square wave through inverter bridge Q1-Q4 and exports, such as Fig. 6 institute
Show, the carrier frequency of low level " 0 " can be f2, and the carrier frequency of high level " 1 " can be f1, the carrier wave of emergency parachute " EM "
Frequency can be fm.The inversion carrier wave of inverter bridge Q1-Q4 output is through the LLC resonance in carrier wave generation and isolation circuit unit 430
After transformation, it is converted into sine wave, the waveform of the sine wave can be become as shown in the transformer primary side waveform in Fig. 6 by isolation
Depressor Tp couples the sine wave wave on high voltage dc bus, to carry out signal transmission by the high voltage dc bus.It needs
Illustrate, for the signal which is transmitted as high-frequency carrier signal, signal waveform is high as shown in Figure 6
Voltage DC bus waveform.
As it can be seen that LLC mode, which can be used, in the signal coupled system of the subsea DC power transmission cable in the present embodiment carries out carrier wave
Modulation, and the feature that LLC resonance topological high efficiency, transmission energy is big, high reliability and coupling sine degree are good is combined, it can
Meet in remote subsea DC transmission of electricity occasion that distance is remote, voltage is high and the application demand of high reliablity.
In addition, the signal coupled system of the subsea DC power transmission cable in the utility model embodiment can use multicarrier
The independent loop filter of frequency and the method for processing are decoded, and eliminate the design difficulty of filtering, and improving that system is decoded can
By property.
In the concrete realization, it can successively include signal blocking and transformer isolation circuit, more strings that signal, which reconciles circuit 130,
Join LC frequency-selective network, multiband second order active band logical frequency-selecting filter and voltage comparator and digital signal processing circuit,
And carrier signal can be detected using multi-resonant and frequency selection method, and can restore by level comparison circuit to signal.
In one optional embodiment, above-mentioned signal demodulating circuit 130 may include: signal block isolating circuit 131, signal choosing
Frequency filter circuit 132 and signals revivification circuit 133.One end of the signal block isolating circuit 131 connects the direct current transportation conducting wire,
The other end of the signal block isolating circuit 131 connects the signal selective frequency filter circuit 132, is used for the direct current transportation conducting wire
The high-frequency carrier signal transmitted is transferred to the signal selective frequency filter circuit 132.The signal selective frequency filter circuit 132 is used
In carrying out frequency-division filter to the high-frequency carrier signal, filtering signal is produced, and the filtering signal is exported to the signal
Also primary circuit 133.The signals revivification circuit 133, for carrying out reduction treatment to the filtering signal, the base after being restored
Baseband signal after band signal, and the output reduction.
Specifically, the high-voltage direct-current busbar voltage for being loaded with carrier signal can be by signal block isolating circuit 131
Capacitance Cdc and isolating transformer Ts are reduced into high-frequency carrier signal, as shown in Fig. 2, then can be through signal frequency-selective filtering electricity
Series resonant circuit in road 132 filters out the route clutter in the high-frequency carrier signal, with defeated to signals revivification circuit 133
The filtering signal obtained after filtering out, then can export the signal selective frequency filter circuit 132 by signals revivification circuit 133
Filtering signal carries out reduction treatment, to export the baseband signal after reduction, realizes the decoding function of cable signal coupled system.
In the present embodiment, optionally, above-mentioned signal selective frequency filter circuit 132 may include: resonator filter circuit unit
With precise rectification circuit unit.Wherein, resonator filter circuit unit can be connect with the signal block isolating circuit, for filtering out
The route clutter in high-frequency carrier signal is stated, generates filtering signal, and the filtering signal can be exported to the precision rectifying
Circuit unit.The precise rectification circuit unit for rectifying to the filtering signal, and can believe the filtering after rectification
Number output to the signals revivification circuit.
In the concrete realization, resonator filter circuit unit may include resonator, filter capacitor Cs1, resonator, filter inductance Ls1
Resistance R1 is adjusted with resonance.One end that the resonance adjusts resistance R1 connects the resonator, filter capacitor Cs1, and the resonance is adjusted
The other end of resistance R1 connects the resonator, filter inductance Ls1；First output end of the signal block isolating circuit 131 connects resonance
Filter capacitor Cs1, and the second output terminal of the signal block isolating circuit 131 connects the resonator, filter inductance Ls1.Wherein, humorous
Vibration, which adjusts resistance R1, can be used for resonant tank quality factor value Q, i.e., in debugging process, can adjust electricity by adjusting resonance
The Q of resonance circuit value in R1 adjusting resonator filter circuit unit is hindered, so as to adjust system filter sensitivity.
Further, signal block isolating circuit 131 may include having capacitance Cdc and isolating transformer Ts.The isolation
The primary side of transformer Ts is connect by the capacitance Cdc with direct current transportation conducting wire, the secondary side of the isolating transformer Ts with
The connection of resonator filter circuit unit.In the concrete realization, the primary side of isolating transformer Ts can be by capacitance Cdc and straight
Transmission pressure connection is flowed, the secondary side of isolating transformer Ts can pass through resonator filter circuit unit and signal selective frequency filter circuit
132 connections.For example, as shown in Fig. 2, one end of capacitance Cdc can connect the primary side of isolating transformer Ts, capacitance
The end b for the under-water DC power supply that the other end of Cdc may be coupled to；For another example, as shown in fig. 7, one end of capacitance Cdc can be with
Connect the primary side of isolating transformer Ts, the end a for the under-water DC power supply that the other end of capacitance Cdc may be coupled to and straight
Flow the other end etc. of transmission pressure.
As an example of the utility model, a channel decoding circuit in signal demodulating circuit 130 may include
Sequentially connected signal block isolating circuit 131, signal selective frequency filter circuit 132 and signals revivification circuit 133.As shown in fig. 7, signal
Capacitance Cdc, isolating transformer Ts in block isolating circuit 131 can be with the resonator, filter capacitors in resonator filter circuit unit
Cs1, resonator, filter inductance Ls1 and resonance adjust resistance R1 and are integrated in same circuit unit, as shown in fig. 7, can be by resonance
Filter capacitor Cs1, resonator, filter inductance Ls1, resonator, filter capacitor Cs1, resonator, filter inductance Ls1 and resonance adjust resistance R1
Constitute blocking and resonator filter circuit unit 710.
Optionally, the signal selective frequency filter circuit 132 in the utility model embodiment can also include conditioning filter circuit
Unit.The input terminal of the conditioning filter circuit unit can be connect by resonator filter circuit unit with signal block isolating circuit 131,
And the output end of the conditioning filter circuit unit can be connect with precise rectification circuit unit.
In the concrete realization, as shown in fig. 7, conditioning filter circuit unit 720 can be used as subsea DC power transmission cable
Circuit conditioning and active filter circuit in signal coupled system, can form difference by transport and placing device A1 and its peripheral circuit and put
Big device, the filtered amplitude size of regulating system, the interference of filtering appts bring difference, the signal that will be removed after checking the mark interference are defeated
Precision rectifying is carried out to precise rectification circuit unit 730 out, forms the carrier signal for having high frequency ripple, it then can be by the band
Filtering signal is obtained after having the carrier signal of high frequency ripple to be used as filtering and is transferred to signals revivification circuit 133, to pass through the signal
Signal processing circuit also in primary circuit 133 carries out reduction treatment.
By taking signal frequency f1 as an example, it is loaded with the high-voltage direct-current busbar voltage of carrier signal, capacitance Cdc can be passed through
And isolating transformer Ts is reduced into carrier signal, is concatenated resonance circuit and filters out route clutter.Circuit parameter Cs1 and Ls1
Between relationship such as formulaIt is shown, also that is, the size of circuit parameter Cs1 and Ls1 can be according toIt determines.
In this example, the value of R1 can be used for adjusting the Q of resonance circuit in blocking and resonator filter circuit unit 710
Value, to adjust system filter sensitivity in debugging process.Transport and placing device A1 and its peripheral circuit can form difference amplifier, tool
Body can be used for the filtered amplitude size of regulating system, with the interference of filtering appts bring difference.The differential amplification implement body is put
Big multiple A and circuit parameter can be as follows shown in formula 1.
Formula 1:
Wherein, the A in formula 1 indicates the amplification factor of differential loop；R2 can be used to indicate that transport and placing device A1 input terminal institute
The value of the resistance R2 of connection；R3 can be used to indicate that the value for the resistance R3 that transport and placing device A1 input terminal is connected；R4 can be used for table
Show the value for the resistance R4 that transport and placing device A1 is connected；R5 can be used to indicate that the value for the resistance R5 that transport and placing device A1 is connected.
Transport and placing device A2 and its peripheral circuit can form Second-Order Active Filters, low-passing part filter cutoff frequency fL
It can be as follows shown in formula 2 with high-pass part filter cutoff frequency fH.
Formula 2:
Wherein, the C1 in formula 1 can indicate the value for the first capacitor C1 that transport and placing device A2 input terminal is connected；C2 can be with table
Show the value for the second capacitor C2 that transport and placing device A2 input terminal is connected；R7 can be used to indicate that the resistance R7 that the second capacitor C2 is connected
Value；R9 can be used to indicate that the value for the resistance R9 that transport and placing device A2 is connected.
The filter rate mu-factor Auf and passband amplification factor Aup of circuit conditioning and active filter circuit can be as
Shown in formula 3.
Formula 3:
Analyzed according to formula 2 and formula 3: when fH such as being scheduled carrier frequency -3dB gain, carrier signal is through amplifier
After will not significantly alter, when design high-pass part cutoff frequency 1.5dB decay when, the gain can be effectively improved, pressed simultaneously
The signal of communication decaying of this design is constant.
In the concrete realization, the close rectification circuit unit 730 in this example can be used as the letter of subsea DC power transmission cable
Precise rectification circuit in number coupled system.As shown in fig. 7, can be using the prime transport and placing device A3 in precise rectification circuit as half
Wave precise rectification circuit, when diode D1 cut-off, rear class transport and placing device A4 can be reverse phase summing circuit.Precise rectification circuit can
To realize the absolute value output of result, input/output relation can be as shown in formula 4.
Formula 4:
Wherein, the Vrout in formula 4 can indicate the output voltage values of precise rectification circuit；Vrin can indicate accurate
The output voltage values of rectification circuit；R11 can be used to indicate that the value for the resistance R11 that transport and placing device A4 is connected；R12 can be used for table
Show the value for the resistance R12 that transport and placing device A3 is connected；R15 can be used to indicate that the value for the resistance R15 that transport and placing device A4 is connected；R17
It can be used to indicate that the value for the resistance R17 that transport and placing device A4 is connected.
After precision rectifying, the signal coupled system of subsea DC power transmission cable can pass through signals revivification circuit 133
Reduction treatment is carried out, and can be by the over-voltage comparator A5 in the signals revivification circuit 133, by the baseband signal after reduction
It is sent into signal processing circuit and carries out being in communication with each other between signal.
For example, as shown in figure 8, in low level " 0 ", high level " 1 ", corresponding three kinds of different conditions in emergency parachute " EM "
In the case where frequency signal, as the high-voltage direct-current bus waveform for being loaded with carrier signal in high voltage dc bus, it can pass through
After bandpass filtering in high frequency transformer Ts, capacitance Cdc and signal selective frequency filter circuit 132, high frequency carrier is restored
The corresponding resonator, filter waveform of signal.The resonator, filter waveform can form after precise rectification circuit with high frequency line
The carrier signal of wave, the corresponding signal of precision rectifying waveform as shown in Figure 8.For traditional magnitude demodulator mode,
The signal energy that signal demodulation mode in this example obtains is bigger, and signal time delay is shorter, basic after over-voltage comparator
It is reduced to baseband signal and is fed into signal processing circuit.
Further, the signal coupled system of the subsea DC power transmission cable in this example can self-built emergency channel, with
An emergency situation is encountered, the lower emergency for directly carrying out switch magnitude by emergency channel is shut down.Specifically, encountering urgent feelings
Under condition, the emergency that the signal coupled system of subsea DC power transmission cable can directly carry out switch magnitude is shut down, and increases system
Safety and stability.
As it can be seen that the utility model embodiment is by providing a kind of signal coupled system of new subsea DC power transmission cable,
Realize signal of communication high-power remote transmitted in both directions in high-voltage undersea cable, and the signal transmission of the signal coupled system
Power is big, strong interference immunity, carrier wave formation efficiency are high, and signal delay time is short；And by individually establishing subsea DC transmission of electricity
The emergency flight control channel of the signal coupled system of cable, improves the real-time of system response.
Wherein, signal modulation coupling circuit can be used as the signal modulation of the signal coupled system of subsea DC power transmission cable
And coupling circuit, it can specifically include signal modulation and driving circuit, carrier generating circuit, LLC resonance and high_voltage isolation circuit.
Bank base power information processing system can be coupled by the signal modulation in the signal coupled system of the subsea DC power transmission cable
Circuit carries out information to be encoded into base band signal transmission extremely modulation and driving circuit, and can pass through LLC resonant converter signal frequency
The load of baseband signal is realized in the change of rate.It should be noted that two resonance points of LLC resonant converter can be followed successively by f1
And f2；Wherein, f1 can be resonance frequency of the sum with resonant capacitance of static exciter inductance, leakage inductance and resonant inductance；F2 can
Think resonance frequency of the sum with resonant capacitance of transformer leakage inductance and resonant inductance.In the concrete realization, f1 can be successively selected,
F2, and frequency fm among it, as high level, low level and emergency parachute frequency, and can be by controlling LLC resonant transformation
The driving signal of device realizes the modulation of baseband signal.Specifically, can use two resonance points of LLC resonance circuit realizes that high frequency carries
The high efficiency of wave generates, and can construct resonance point and high_voltage isolation circuit by high frequency transformer.
In addition, the signal demodulating circuit in the utility model embodiment can pass through building multiselect frequency signal network and filtering
Network the signal-to-noise ratio of signal is effectively reduced, and can realize the quick of data by comparator and number holding and processing circuit
Processing in real time, while the emergency channel that can be constructed can quickly block bank base power supply, protect transmission system.Specifically, signal solution
It adjusts circuit to can be used as signal decoding circuit, can specifically include signal blocking and isolation circuit, multi signal frequency-selecting and filtered electrical
Road, level comparison circuit.High-frequency carrier signal is filtered by multi signal frequency-selecting and filter circuit, then can be through over level ratio
Baseband signal is reduced into compared with circuit, and by digital signal processing circuit.
To sum up, the utility model embodiment is by using the method progress in the independent loop filter of multiple radio frequency and processing
Decoding, eliminates the design difficulty of filtering, improves the decoded reliability of system；And it can be by individually establishing emergency flight control letter
Road improves the real-time of system response；And reception system, underwater building emission system progress can be constructed in bank base simultaneously
Signal transmission, realizes signal transmitted in both directions.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
It above are only the preferred embodiment and institute's application technology principle of the utility model.It will be appreciated by those skilled in the art that
The utility model is not limited to specific embodiment described here, is able to carry out various apparent changes for a person skilled in the art
Change, readjust and substitutes without departing from the protection scope of the utility model.Therefore, although by above embodiments to this reality
It is described in further detail with novel, but the utility model is not limited only to above embodiments, it is practical not departing from
It can also include more other equivalent embodiments in the case where novel design, and the scope of the utility model is by appended right
Claimed range determines.
Claims (10)
1. a kind of signal coupled system of subsea DC power transmission cable characterized by comprising DC transmission system circuit, letter
Number modulation coupling circuit and signal demodulating circuit；
The signal modulation coupling circuit generate high-frequency carrier signal, and will for carrying out processing modulation to systems baseband signal
The high-frequency carrier signal is loaded into the direct current transportation conducting wire of the DC transmission system circuit, to be led by the direct current transportation
Line is transferred to the signal demodulating circuit；
The signal demodulating circuit, the high-frequency carrier signal for being transmitted to the direct current transportation conducting wire carry out frequency-division filter,
Filtering signal is obtained, and reduction treatment is carried out to the filtering signal, the baseband signal after being restored, and output are described also
Baseband signal after original.
2. system according to claim 1, which is characterized in that the DC transmission system circuit includes: bank base power supply, water
Lower DC power supply and direct current transportation conducting wire；
One end of the direct current transportation conducting wire connects the bank base power supply and the signal modulation coupling circuit, the direct current transportation
The other end connection under-water DC power supply of conducting wire and the signal reconcile circuit；
The direct current transportation conducting wire, the HVDC transmission for providing the bank base power supply is to the under-water DC electricity
Source；
The under-water DC power supply generates low-voltage DC, wherein institute for carrying out decompression processing to the high voltage direct current
The voltage for stating high voltage direct current is higher than the voltage of the low-voltage DC.
3. system according to claim 1, which is characterized in that the signal modulation coupling circuit include signal modulation driving
Circuit, carrier generating circuit and resonant coupling circuit；
One end of the carrier generating circuit connects the signal modulation driving circuit, and the other end of the carrier generating circuit connects
Connect the resonant coupling circuit；
The signal modulation driving circuit generates pulse width modulation for being modulated to the systems baseband signal received
Signal, and according to pulse width modulating signal to the carrier generating circuit output drive signal；
The carrier generating circuit for generating carrier signal according to the driving signal, and the carrier signal transmission is given
The resonant coupling circuit；
The resonant coupling circuit generates high-frequency carrier signal, and will be described for carrying out power amplification to the carrier signal
High-frequency carrier signal is loaded into the direct current transportation conducting wire.
4. system according to claim 3, which is characterized in that
The carrier generating circuit includes transistor unit, and the control terminal of the transistor unit connects the signal modulation driving
Circuit, and the output end of the transistor unit connects the resonant coupling circuit；
The resonant coupling circuit includes isolating transformer, and the resonant coupling circuit passes through the isolating transformer and described straight
Flow transmission pressure connection.
5. system according to claim 1, which is characterized in that the signal demodulating circuit includes: signal block isolating circuit, letter
Number selective frequency filter circuit and signals revivification circuit；
One end of the signal block isolating circuit connects the direct current transportation conducting wire, and the other end of the signal block isolating circuit connects institute
Signal selective frequency filter circuit is stated, the high-frequency carrier signal for being transmitted the direct current transportation conducting wire is transferred to the signal choosing
Frequency filter circuit；
The signal selective frequency filter circuit produces filtering signal, and will for carrying out frequency-division filter to the high-frequency carrier signal
The filtering signal is exported to the signals revivification circuit；
The signals revivification circuit, for carrying out reduction treatment to the filtering signal, the baseband signal after being restored, and
Baseband signal after exporting the reduction.
6. system according to claim 5, which is characterized in that the signal selective frequency filter circuit includes: resonator, filter electricity
Road unit and precise rectification circuit unit；
The resonator filter circuit unit is connect with the signal block isolating circuit, for filtering out the line in the high-frequency carrier signal
Road clutter generates filtering signal, and the filtering signal is exported to the precise rectification circuit unit；
The precise rectification circuit unit is exported for rectifying to the filtering signal, and by the filtering signal after rectification
To the signals revivification circuit.
7. system according to claim 6, which is characterized in that the resonator filter circuit unit includes resonator, filter electricity
Hold, resonator, filter inductance and resonance adjust resistance；
One end that the resonance adjusts resistance connects the resonator, filter capacitor, and the other end that the resonance adjusts resistance connects institute
State resonator, filter inductance；
First output end of the signal block isolating circuit connects resonator, filter capacitor, and the second output of the signal block isolating circuit
End connects the resonator, filter inductance.
8. system according to claim 7, which is characterized in that the signal block isolating circuit includes that capacitance and isolation become
Depressor；
The primary side of the isolating transformer is connect by the capacitance with direct current transportation conducting wire, the pair of the isolating transformer
Side is connect with the resonator filter circuit unit.
9. system according to claim 6, which is characterized in that the signal selective frequency filter circuit further include: conditioning filtering
Circuit unit；
The input terminal of the conditioning filter circuit unit is connected by the resonator filter circuit unit and the signal block isolating circuit
It connects, and the output end of the conditioning filter circuit unit is connect with precise rectification circuit unit.
10. system according to claim 3, which is characterized in that the signal modulation driving circuit includes: digital signal tune
Circuit unit and signal drive circuit unit processed；
The input terminal of the signal drive circuit unit connects the digital signal modulated circuit unit, the signal drive circuit
The output end of unit connects the carrier generating circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920063726.8U CN209120179U (en) | 2019-01-15 | 2019-01-15 | A kind of signal coupled system of subsea DC power transmission cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920063726.8U CN209120179U (en) | 2019-01-15 | 2019-01-15 | A kind of signal coupled system of subsea DC power transmission cable |
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