WO2002005450A1 - Procede de reception d'un signal transmis par l'intermediaire du reseau electrique et dispositif pour sa mise en oeuvre - Google Patents
Procede de reception d'un signal transmis par l'intermediaire du reseau electrique et dispositif pour sa mise en oeuvre Download PDFInfo
- Publication number
- WO2002005450A1 WO2002005450A1 PCT/FR2001/002249 FR0102249W WO0205450A1 WO 2002005450 A1 WO2002005450 A1 WO 2002005450A1 FR 0102249 W FR0102249 W FR 0102249W WO 0205450 A1 WO0205450 A1 WO 0205450A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- control signal
- frequency
- digital
- electrical signal
- Prior art date
Links
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
- 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
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
Definitions
- the present invention relates to a method of receiving a control signal transmitted via the network for the distribution of an electrical signal having a fundamental frequency and harmonic frequencies, the control signal having a main frequency different from the fundamental frequency and harmonic frequencies of the electrical signal, the method comprising converting the analog control signal into a digital signal and filtering said digital signal. It also relates to a device for implementing the method.
- the invention applies more particularly to the reception of a centralized remote control signal. For a very long time, it has been known to use an analog centralized remote control signal transmitted via the electricity distribution network in order to modify the pricing of meters, trigger a switching for the connection or disconnection of electric heaters or air conditioners at users' premises or any other electrical switching.
- the control signal is made up of pulses whose number, frequency, duration and amplitude constitute the characteristics determining the control considered.
- the electrical signal distributed by the network has a fundamental frequency, for example 50 Hz, and harmonic frequencies.
- the control signal has a main frequency generally located between two harmonic frequencies of the electrical signal. Its frequency is for example fixed at 175 Hz which is located between harmonics 3 and 4 of the electrical signal (respectively 150 Hz and 200 Hz if the fundamental frequency is equal to 50 Hz).
- a digital selective bandpass filter eliminating any frequency not contained in a narrow band (for example ranging from 173 Hz to 177 Hz) centered on the main frequency of the control signal ( for example 175 Hz).
- the control signal alone is therefore obtained at the output of the filter, which is then processed by an algorithm making it possible to determine the content of the command.
- the narrower the filter the better the rejection of harmonics.
- the rise time of the filter is inversely proportional to the width of the passband.
- reducing the width of the pass band of the filter imposes a minimum duration of the pulses constituting the control signal.
- These pulses can for example have a duration of around one second for a frame having a duration of around sixty seconds (a frame comprising around forty pulses).
- the number of different devices which it is desired to switch via the increasing control signal the number of commands contained in the control signal must also increase. This implies an increase in the number of pulses contained in a frame and therefore a reduction in their duration.
- this reduction in the duration of the pulses making up the control signal is limited by the use of a narrow band selective bandpass filter.
- the present invention provides a particularly simple solution to implementing the problem posed by the increase in the number of pulses within a frame of a control signal transmitted over the electrical network and therefore by the decrease in the duration of the pulses and their reception.
- the invention recommends selective filtering intended to eliminate at least the frequency of the electrical signal closest to the main frequency of the control signal.
- Selective filtering must be understood as acting only in a very narrow band of width equal to or less than 4 Hz.
- the width of the bands is for example measured at mid-height in a representation of the amplitude of the components of the signals as a function of their frequency.
- the selective filtering consists in carrying out a filtering intended to eliminate the two frequencies of the electrical signal framing the main frequency of the control signal.
- the fundamental frequency (and therefore the harmonic frequencies) of the electrical signal is not fixed but varies over a range of a few Hertz.
- the fundamental frequency is qualified as 50 Hz, it in fact varies in a frequency range going from 47 Hz to 53 Hz.
- the fundamental frequency of the electrical signal comprises a bandpass filtering step with a wide passband centered on the main frequency of the control signal.
- the present invention also relates to a device for implementing the method.
- the device comprises an analog / digital converter capable of delivering a digital signal and comprises at least one digital selective filter intended to eliminate the frequency of the electrical signal closest to the main frequency of the control signal.
- the device according to the invention comprises two digital selective filters intended to eliminate the harmonic frequencies of the electrical signal framing the main frequency of the control signal.
- the device according to the invention further comprises means for determining the fundamental frequency of the electrical signal; in addition, the selective filter or filters adapt the selected frequency to be filtered as a function of variations in the fundamental frequency of the electrical signal.
- the selective filter or filters are notch filters.
- the device further comprises a digital filter having a wide passband centered on the main frequency of the control signal.
- the bandpass filter comprises one or more recursive filters with infinite impulse response.
- FIG. 1 is a diagram of electricity meter capable of receiving a centralized remote control signal
- FIG. 3 schematically shows the bands of the various filters applied to the electrical and control signals according to the invention.
- FIG. 1 schematically shows an electricity meter 1 adapted to receive a centralized remote control signal.
- the signal from the network is directed on the one hand to metrological means 10 making it possible, among other things, to determine the electrical consumption and on the other hand, to the receiver 12 of the centralized remote control signal signal.
- the receiver 12 comprises an analog / digital converter 14 which converts the input signal constituted by the superposition of the electrical signal and the control signal into a digital signal.
- FIG. 2 schematically represents the distribution in amplitude of the input signal as a function of the frequency.
- a main component Hi of the electrical signal at a fundamental frequency, for example 50 Hz, and harmonic components H 2 , H 3 , H l ... (at 100 Hz, 150 Hz, 200 Hz, ...) are superimpose on the component SC of the control signal located in this example between the harmonics 3 and 4 of the electrical signal, at 175 Hz.
- the digital signal is delivered by the converter 14 on the input of a filter 16 provided for eliminating the components of the electrical signal without affecting the component of the control signal.
- FIG. 3 schematically represents the action of the digital filter 16 on the frequency distribution of the digital signal.
- a digital bandpass filter having a wide passband LB eliminates the fundamental component of the electrical signal, its harmonic 2 and the harmonics of order greater than 4.
- the passband in this example is approximately 50 Hz to mid -height.
- Such a filter can be achieved by adding a few recursive filters with infinite impulse response.
- These filters have the advantage of being simple to implement and requiring little computation time. Indeed, these filters are of the type:
- the receiver 12 includes means for measuring the fundamental frequency of the electrical signal. These means can be achieved using a notch filter in a manner known per se. Furthermore, certain electricity meters include in their metrological elements means for measuring the main frequency of the electrical signal and it is then sufficient to transmit this information to the filter 16.
- the frequency bands FS1 and FS2 eliminated by the notch filters are therefore adapted according to variations in the fundamental frequency of the electrical signal. For this, the fundamental frequency measured continuously, for example at a frequency of a few kHz, is multiplied by the coefficients 3 and 4 to give the frequency of the harmonics 3 and 4.
- the frequencies of these harmonics are used by the notch filters as parameters indicating the centers of the selective bands FS1 and FS2 to be eliminated.
- the control signal isolated from the components of the electrical signal is delivered at the input of processing means 18 carrying out the conventional operations of smoothing, rectification, envelope detection, measurement of the duration of the pulses and their amplitude, and finally acceptance of the pulse considered as part of the control or rejection signal, if this pulse is considered noise.
- the formatted control signal is directed to control means MC, for example relays which switch or not according to the content of the command.
- control means MC for example relays which switch or not according to the content of the command.
- the various conversion, filtering and processing operations can advantageously be carried out by the microprocessor which controls the metrological means of the counter and requires only additional programming without the need to integrate other components into the counter.
- the present invention therefore makes it possible to significantly reduce the duration of the pulses composing a control signal while taking into account the fluctuations of the fundamental frequency of the electrical signal, by using only simple and inexpensive means to implement.
- no analog filtering of the incoming signal is necessary.
- the example given here for an electrical signal frequency equal to 50 Hz and for a signal frequency at 175 Hz can be transposed to other frequencies without departing from the scope of the present invention.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Networks Using Active Elements (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001276436A AU2001276436A1 (en) | 2000-07-12 | 2001-07-11 | Method for receiving a signal transmitted via a power distribution network and device therefor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/09279 | 2000-07-12 | ||
FR0009279A FR2811833B1 (fr) | 2000-07-12 | 2000-07-12 | Procede de reception d'un signal transmis par l'intermediaire du reseau electrique et dispositif pour sa mise en oeuvre |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002005450A1 true WO2002005450A1 (fr) | 2002-01-17 |
Family
ID=8852535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/002249 WO2002005450A1 (fr) | 2000-07-12 | 2001-07-11 | Procede de reception d'un signal transmis par l'intermediaire du reseau electrique et dispositif pour sa mise en oeuvre |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2001276436A1 (fr) |
FR (1) | FR2811833B1 (fr) |
WO (1) | WO2002005450A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6545631B2 (en) * | 2000-10-17 | 2003-04-08 | United Parcel Service Of America, Inc. | Integrated datalinks in a surveillance receiver |
EP1882613A1 (fr) * | 2005-05-11 | 2008-01-30 | Hitachi, Ltd. | Vehicule et dispositif de commande de communication intra-vehicule |
FR3050883A1 (fr) * | 2016-05-01 | 2017-11-03 | Ergylink | Dispositif et procede pour recevoir des telecommandes transpises par au moins deux canaux independants dans un reseau electrique |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4737658A (en) * | 1985-08-05 | 1988-04-12 | Brown, Boveri & Cie Ag | Centralized control receiver |
CH670923A5 (en) * | 1986-09-17 | 1989-07-14 | Zellweger Uster Ag | Data communications device using AC distribution network - has filter for suppression of network harmonics within received signal |
-
2000
- 2000-07-12 FR FR0009279A patent/FR2811833B1/fr not_active Expired - Fee Related
-
2001
- 2001-07-11 AU AU2001276436A patent/AU2001276436A1/en not_active Abandoned
- 2001-07-11 WO PCT/FR2001/002249 patent/WO2002005450A1/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4737658A (en) * | 1985-08-05 | 1988-04-12 | Brown, Boveri & Cie Ag | Centralized control receiver |
CH670923A5 (en) * | 1986-09-17 | 1989-07-14 | Zellweger Uster Ag | Data communications device using AC distribution network - has filter for suppression of network harmonics within received signal |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6545631B2 (en) * | 2000-10-17 | 2003-04-08 | United Parcel Service Of America, Inc. | Integrated datalinks in a surveillance receiver |
EP1882613A1 (fr) * | 2005-05-11 | 2008-01-30 | Hitachi, Ltd. | Vehicule et dispositif de commande de communication intra-vehicule |
EP1882613A4 (fr) * | 2005-05-11 | 2010-01-06 | Hitachi Ltd | Vehicule et dispositif de commande de communication intra-vehicule |
FR3050883A1 (fr) * | 2016-05-01 | 2017-11-03 | Ergylink | Dispositif et procede pour recevoir des telecommandes transpises par au moins deux canaux independants dans un reseau electrique |
Also Published As
Publication number | Publication date |
---|---|
FR2811833B1 (fr) | 2007-05-11 |
FR2811833A1 (fr) | 2002-01-18 |
AU2001276436A1 (en) | 2002-01-21 |
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