GB2517727A - Digitally generated communication on power based on separately modulated power and data signals - Google Patents

Digitally generated communication on power based on separately modulated power and data signals Download PDF

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Publication number
GB2517727A
GB2517727A GB1315413.3A GB201315413A GB2517727A GB 2517727 A GB2517727 A GB 2517727A GB 201315413 A GB201315413 A GB 201315413A GB 2517727 A GB2517727 A GB 2517727A
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United Kingdom
Prior art keywords
power
data
bridge
signal
waveform
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Granted
Application number
GB1315413.3A
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GB201315413D0 (en
GB2517727B (en
Inventor
Silviu Puchianu
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Baker Hughes International Treasury Services Ltd
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Vetco Gray Controls Ltd
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Priority to GB1315413.3A priority Critical patent/GB2517727B/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/0017—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5475—Systems for power line communications adapted for drill or well combined with data transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5491—Systems for power line communications using filtering and bypassing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Abstract

A method of data communication on a power line in a deep sea hydrocarbon well facility where above sea a power signal half H-bridge A and a data signal half H-bridge B comprising respective DC supplies 12, 13 output respectively a power signal and data signal for combination and transmission over an umbilical line 20. Switches 15, 16, 18, 19 are independently operated by digital signal processors 14, 17 to generate AC waveforms from the DC supplies 12, 13 to form power and data signals using pulse width modulation. The low frequency power signal and high frequency data signal are combined and the voltage difference between them forms a communication signal that is transmitted to a subsea facility where data is extracted by discriminator 21 and power is provided to load 25. A data half H-bridge C at subsea level may transmit data topside using the same method. The system overcomes the problem of losses and data distortion inherent in systems using filters. Field programmable gate arrays or microcontrollers may alternatively be used as the modulation means.

Description

Digitally generated communication on power based on separately modulated power and data signals
Field of the Invention
This invention relates to transmitting data by communication on power, for example in a control system for a subsea hydrocarbon well facility.
Background of the Invention
Communication on power systems (COPS) are electrical power and data transmission systems where an analogue data waveform is superimposed on a power waveform at one end and, at another other end, power and data filters are used to separate the power waveform from the data waveform.
For long offset power and data transmission systems (for example tens or hundreds of miles), this method allows for bi-directional transmission of power and data on the same copper wires.
These systems are widely used in control systems for subsea hydrocarbon well facilities.
A known system is illustrated in Fig. 1 and uses hardware analogue filters. These filters are not accurate, they are space intensive and they introduce distortions, noise and power losses. Furthermore transients on the power source can corrupt the data transmission.
More particularly, at a topside end of a long COP line 1 electrical power is supplied by a transformer 2 and a power filter 3 to a combiner 4 where data from a modem 5 and a data filter 6 is combined with the power waveform for transmission via line 1. Also, data received from subsea can be extracted from line 1 via the filter 6 and the modem 5. At the other, subsea end of line 1, electrical power is extracted from a combiner 7 via a power filter 8 and a transformer 9 and data is extracted via a data filter 10 and a modem 11. Also, data can be sent to the topside end via modem 11 and filter 10 for extraction from combiner 4.
As prior art, there may be mentioned US-A-4 398 178, WO 00/46923, EP-A-2 104 240, GB-A-2 441 811, WO 2004/028064, EP-A-0 463 341, US 2006/079971 and GB-A-2 352 376.
Summary of the Invention
According to the present invention from one aspect, there is provided a communication on power system for transmitting electrical power and data from a first end of a transmission line to a second end of the transmission line, the apparatus comprising, at said first end: a power signal half H-bridge having a power signal output for outputting a power signal; a data signal half H-bridge having a data signal output for outputting a data signal; a first DC supply means for supplying direct current to the power signal half H-bridge; a second DC supply means for supplying direct current to the data signal half H-bridge; and supply means for supplying direct current signal to a power signal half H-bridge and a data signal half H-bridge, wherein the voltage differential between the outputs of the power signal half H-bridge and data signal half H-bridge is used to form a communication on power signal at the first end of said transmission line for the transmission of said communication on power signal to said second end of the transmission line, and a first modulator means is coupled with the power signal half H-bridge for modulating a direct current signal with a power waveform, and a second modulator means is coupled with the data signal half H-bridge for modulating a direct current signal with a data waveform.
The first and I or second modulator means may optionally operate the switches of the half H-bridges to modulate the DC current with pulse width modulation.
Said power waveform could optionally be a square wave or a sine wave, and said data waveform could optionally be an analogue data waveform.
Said first and second modulator means could comprise digital signal processors, field programmable gate arrays or micro-controllers.
A control system for a subsea hydrocarbon well facility could comprise a system according to the invention, said first end being located topside and said second end being located subsea.
According to the invention from another aspect, there is provided a method of transmitting electrical power and data from a first end of a transmission line to a second end of the transmission line, the method comprising, at said first end: supplying a direct current signal to a power signal half H-bridge and a data signal half H-bridge, using the voltage differential between the outputs of the power signal halt H-bridge and data signal half H-bridge to form a communication on power signal at the first end of said transmission line for the transmission of said communication on power signal to said second end of the transmission line, characterised in that said outputs are produced by a first modulator means coupled with the power signal half H-bridge for modulating a direct current signal with a power waveform, and a second modulator means coupled with the data signal half H-bridge for modulating a direct current signal with a data waveform.
Brief Description of the Drawings
Fig. 1 is a block diagram of a known COP system; and Fig. 2 is a block diagram of a COP system according to an embodiment of the invention.
Detailed Description of the Invention
Fig. 2 schematically shows a COP system in accordance with an embodiment of the present invention, and in particular shows surface or topside" apparatus linked to subsea apparatus by a transmission line in the form of an umbilical cable.
A first direct current (DC) supply 12 is provided for a power signal half H-bridge A and a second DC supply 13 is provided for a data signal half H-bridge B. A half H-bridge is a single-direction configuration of an H-bridge controller, comprising a pair of independently operable gates. In this example, the first DC supply 12 is 600V and the second DC supply is 30V. It is generally preferable to have a lower DC supply for the data signal half H-bridge, as this signal will be modulated at a higher frequency than the power signal. Consequently, the losses associated with frequent switching of the voltage from positive to negative will be reduced with a lower voltage on the data signal half H-bridge.
The first DC supply 12 is modulated with a power waveform, by a first digital signal processoi (DSP) 14 which operates gates 15, 16 of the power signal half H-bridge. In this example, the DSP operates the gates 15, 16 to produce a power waveform having an applied modulation. In this embodiment, the modulation applied is pulse width modulation (PWM), although any appropriate technique may be used. The resultant power waveform is an alternating waveform, for example a square or sine waveform, with a relatively low frequency in the region of approximately 50Hz.
The second DC supply 13 is modulated with a data waveform, by a second DSP 17 which operates the gates 18, 19 of the data signal half H-bridge. The DSP operates the gates 18, 19 to produce a modulated data waveform on the DC signal. The resultant data waveform is an alternating waveform, for example an analogue waveform of relatively high frequency compared to the frequency of the power waveform. In this embodiment, data is sent on the modulated data waveform using pulse width modulation (PWM), although any appropriate technique may be used.
The midpoints of the DC supplies 12, 13 on each half H-bridge are connected to ground.
Alternatively, the midpoints of each half H-bridge may be connected to each other to ensure that these points remain at the same voltage.
The outputs of each half H-bridge are connected at the first end of the transmission line of the umbilical 20, and the differential between the outputs forms a communication on power signal which may be transmitted from the first end of the umbilical to a second end. In this embodiment the first end is at a topside location and the second end is at a subsea location.
At the subsea end, the modulated data waveform is demodulated by a discriminator 21. The data may then be fed to subsea equipment. Power is fed to the subsea load 25, which may be used to power subsea equipment. Signals may also be returned from subsea equipment to the MCS topside by sending a modulated data waveform back up the umbilical. For this, a subsea data halt H-bridge C is disposed at the subsea end of the umbilical. A DC supply 22 is fed to the subsea data half H-bridge and the gates 23, 24 of the subsea data half H-bridge are operated by a DSP 26 to produce a return data waveform. Note that no half-H bridge for power is required subsea, as the power signal is already modulated by the half H-bridge for power A located topside. The return data waveform may be demodulated topside by a modem 27 or other appropriate discriminator.
The above described embodiment is exemplary only, and other possibilities will be apparent to those skilled in the art. For example, although the above embodiment uses DSPs as the first and second modulator means, these may alternatively comprise field programmable gate arrays or micro-controllers.
Advantages of using the Invention 1) The physical size of the new COPS MCS is reduced by approximately half due to the replacement of hardware analogue filters with DSPs.
2) The reduced number of components may lead to a significantly lower cost.
3) Off-the-shelf standard components may be used, again reducing cost.
4) Higher reliability, availability and maintainability are possible, due to the potential for a higher level of redundancy: only one transformer for the old design versus the potential of using more than one half H-bridge in parallel on each modulator.
5) The absence of a transformer, communications block filter and diplexer as compared with known systems means there are no high voltage transients (generated by the switching on and off of inductive networks).
6) Total control of power characteristics: voltage, frequency, power duty-cycle, etc. 7) Higher power efficiency: the present invention permits the use of a square power waveform, which contains more energy than a sine waveform.
8) Since the present invention dispenses with a diplexer, and furthermore due to the availability of a constant value reference for the data signal, the resulting method for the detection of the TX signal subsea and the RX signal topside is simplified.
9) The present invention provides a very high potential for standardisation.

Claims (14)

  1. CLAIMS: 1. A communication on power system for transmitting electrical power and data from a first end of a transmission line to a second end of the transmission line, the apparatus comprising, at said first end: a power signal half H-bridge having a power signal output for outputting a power signal; a data signal half H-bridge having a data signal output for outputting a data signal; a first DC supply means for supplying direct current to the power signal half H-bridge; a second DC supply means for supplying direct current to the data signal half H-bridge; and supply means for supplying direct current signal to a power signal half H-bridge and a data signal half H-bridge, wherein the voltage differential between the outputs of the power signal half H-bridge and data signal half H-bridge is used to form a communication on power signal at the first end of said transmission line for the transmission of said communication on power signal to said second end of the transmission line, and a first modulator means is coupled with the power signal half H-bridge for modulating a direct current signal with a power waveform, and a second modulator means is coupled with the data signal half H-bridge for modulating a direct current signal with a data waveform.
  2. 2. A system according to claim 1, wherein said first and / or second modulator means operate the switches of the half H-bridges to modulate the DC current with pulse width modulation.
  3. 3. A system according to any preceding claim, wherein said power waveform is a square wave or a sine wave.
  4. 4. A system according to any preceding claim, wherein said data waveform is an analogue data waveform.
  5. 5. A system according to any preceding claim, wherein said first and second modulator means comprise digital signal processors.
  6. 6. A system according to any preceding claim, wherein said first and second modulatormeans comprise field programmable gate arrays.
  7. 7. A system according to any preceding claim, wherein said first and second modulator means comprise micro-controllers.
  8. 8. A control system for a subsea hydrocarbon well facility system comprising a system according to any preceding claim, wherein said first end is located topside and said second end is located subsea.
  9. 9. A method of transmitting electrical power and data from a first end of a transmission line to a second end of the transmission line, the method comprising, at said first end: supplying a direct current signal to a power signal half H-bridge and a data signal half H-bridge, using the voltage differential between the outputs of the power signal halt H-bridge and data signal half H-bridge to form a communication on power signal at the first end of said transmission line for the transmission of said communication on power signal to said second end of the transmission line, wherein said outputs are produced by a first modulator means coupled with the power signal half H-bridge for modulating a direct current signal with a power waveform, and a second modulator means coupled with the data signal half H-bridge for modulating a direct current signal with a data waveform.
  10. 10. A method according to claim 9, wherein said first and I or second modulator means operate the switches of the half H-bridges to modulate the DC current with pulse width modulation.
  11. 11. A method according to any of claims 9 or 10, wherein said power waveform is a square wave or a sine wave.
  12. 12. A method according to any of claims 9 to 11, wherein said data waveform is an analogue data waveform.
  13. 13. A method according to any of claims 9 to 12, wherein said first and second modulator means complise digital signal piocessois, field piogrammable gate arrays or micro-controlleis.
  14. 14. A method according to any of claims 9 to 13, performed in a control system for a subsea hydrocarbon well facility, said first end being topside and said second end being subsea.
GB1315413.3A 2013-08-29 2013-08-29 Digitally generated communication on power based on separately modulated power and data signals Active GB2517727B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170111086A1 (en) * 2014-06-30 2017-04-20 Changjoon Choi Direct current power line communication control device using h-bridge circuit
GB2546766A (en) * 2016-01-28 2017-08-02 Ge Oil & Gas Uk Ltd DC communication on power
GB2557062B (en) * 2015-06-22 2021-04-28 Baker Hughes A Ge Co Llc Power transmission and communication between processors and energy industry devices
EP4131848A1 (en) * 2021-08-05 2023-02-08 Turck Holding GmbH Method and circuit for operating a network or network section

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639717A (en) * 1985-07-15 1987-01-27 Electronics Corporation Of America Method and apparatus for monitoring flame condition
EP2482468A1 (en) * 2011-01-31 2012-08-01 Vetco Gray Controls Limited Communications on power systems
EP2523357A1 (en) * 2011-05-12 2012-11-14 Siemens Aktiengesellschaft Subsea data communication system and method
EP2602941A1 (en) * 2011-12-07 2013-06-12 Vetco Gray Controls Limited Transmitting electrical power and communication signals
EP2645587A1 (en) * 2012-03-29 2013-10-02 Vetco Gray Controls Limited Transmitting data by communication on power

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639717A (en) * 1985-07-15 1987-01-27 Electronics Corporation Of America Method and apparatus for monitoring flame condition
EP2482468A1 (en) * 2011-01-31 2012-08-01 Vetco Gray Controls Limited Communications on power systems
EP2523357A1 (en) * 2011-05-12 2012-11-14 Siemens Aktiengesellschaft Subsea data communication system and method
EP2602941A1 (en) * 2011-12-07 2013-06-12 Vetco Gray Controls Limited Transmitting electrical power and communication signals
EP2645587A1 (en) * 2012-03-29 2013-10-02 Vetco Gray Controls Limited Transmitting data by communication on power

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170111086A1 (en) * 2014-06-30 2017-04-20 Changjoon Choi Direct current power line communication control device using h-bridge circuit
US10298292B2 (en) * 2014-06-30 2019-05-21 TinyPowers Co., Ltd. Direct current power line communication control device using H-bridge circuit
GB2557062B (en) * 2015-06-22 2021-04-28 Baker Hughes A Ge Co Llc Power transmission and communication between processors and energy industry devices
GB2546766A (en) * 2016-01-28 2017-08-02 Ge Oil & Gas Uk Ltd DC communication on power
EP4131848A1 (en) * 2021-08-05 2023-02-08 Turck Holding GmbH Method and circuit for operating a network or network section

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Publication number Publication date
GB201315413D0 (en) 2013-10-16
GB2517727B (en) 2016-05-11

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