Multichannel radio communication system for automated power line distribution networks

• US 4,199,761 A
• Filed: 08/02/1978
• Issued: 04/22/1980
• Est. Priority Date: 08/02/1978
• Status: Expired due to Term

• Current Assignee: ABB Power T&D Limited (ABB Limited)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Whyte, Ian A., Cook, Richard F.
• Primary Examiner(s): Caldwell, Sr., John W.
• Assistant Examiner(s): Crosland, Donnie L.
• Application Number:
  US05/930,294
• Time in Patent Office: 629 Days
• Field of Search: 343/225, 343/226, 179/1 GB, 179/1 GD, 179/2 E, 325/39, 325/47, 325/48, 325/54, 325/3, 325/9-11, 325/36, 325/37, 325/392, 340/310 R, 340/310 A
• US Class Current: 340/9.1
• CPC Class Codes: H02J 13/00004 characterised by the power network being locally controlled
• CPC Class Codes: H02J 13/00022 using wireless data transmission
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H04L 27/12 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

An automated electric power distribution network includes a radio communication system for transmitting multipurpose, multitone signals in one or more signaling channels over the auxiliary channel or channels of one or more commercial broadcast stations. Energy management terminals receive the signals at remote locations served by the distribution network. Radio receivers at the terminals have frequency selective detectors responsive to different multitone signals. The selective allocation of the multitone signals at different remote locations provides different communication links for effecting common or different electric energy usage related responses at grouped or separate locations. Complex address and/or function encoded signal information is reduced by providing the frequency selective reception of the several multitone signaling channels available in a radio or television station auxiliary channel.

Claims

1. A radio communication system for automated control of an electric power distribution network supplying electric energy to customer remote locations defining at least first, second and third predetermined groups of remote locations with each group being separately designated by different selected block addresses and wherein said remote locations within at least said first and second groups are designated by a common universal block address, said radio communication system comprising:

master and satellite commercial VHF-FM broadcast signal transmitting means producing electromagnetic radiations, said radiations from said master transmitting means being receivable by said first and said second groups of said remote locations and said radiations from said satellite transmitting means being receivable by said third group of said remote locations, each of said master and satellite transmitting means including a first FM carrier modulator means for modulating the electromagnetic radiations thereof with information included in a composite broadcast station channel including a broadcast program main channel having both monaural and stereo channels and an SCA auxiliary channel, each of said master and satellite transmitting means further including tone modulator means for producing plural pairs of frequency shift key modulated two tone signals in different frequency spaced signaling channels and still further including second FM carrier modulator means including a subcarrier included in said SCA auxiliary channel thereof and modulating said subcarrier with said pairs of two tone signals;

a source of plural data signals each designating preselected energy usage related command information wherein said plural data signals have either of first and second data signal formats with said first signal format including a predetermined binary coded format having a fixed number of bit intervals and with said second signal format including a continuous bit stream, said plural data signals being received by said tone modulator means of said master transmitting means for producing each of said plurality of pairs of two tone signals in response to separate ones of said plural data signals so as to define corresponding separate ones of said signaling channels;

said satellite transmitting means including radio receiver means receiving said radiations of said master transmitting means and being responsive to at least one of said signaling channels having a data signal responsive to the pair of two tone signals transmitted therein and having the tone modulator means and second FM carrier modulator means thereof responsive to the output of said receiver means for modulating said subcarrier frequency of the SCA auxiliary channel thereof with the received data signals for retransmission to said third group of said remote locations;

plural energy management terminals each located at a separate one of said customer remote locations, said terminals each including control means having energy usage related control functions, said terminals further including receiver means and tone detector means selectively responsive to predetermined ones of said signaling channels in the received one of said electromagnetic radiations of said master and satellite transmitting means, said terminals of said first group of remote locations including logic circuit means responsive to the detector means thereof when receiving at least one signaling channel including a data signal having said first signal format to activate the control means thereof, said terminals of said second group of remote locations having the control means thereof activated by the output of the detector means thereof in response to the presence of another of said signaling channels including a data signal having said second signal format, said terminals of said first and second groups of said remote locations including said common universal block address having the detector means thereof being commonly responsive to still another of said signaling channels including a data signal having said second format for concurrently activating said control means of each terminal therein, and said terminals of said third group of remote locations having the detector means thereof being responsive to a further one of said signaling channels including a data signal with one of said first and second signal formats and being retransmitted by said satellite transmitting means for activating said control means thereof.

2. A radio communication system as claimed in claim 1 wherein said third group of remote locations include said energy management terminals being designated by said common universal block address of said first and second groups of remote locations and being responsive to said still another of said signaling channels in common with both said first and second groups, saidlast named terminals being further responsive to said another signaling channel in common with only said second group, and being still further responsive to said further one of said signaling channels exclusive of the signaling channel responses of said terminals at said first and second groups.

3. A radio communication system as claimed in claim 1 wherein said control means of said energy management terminals include two different load controlling functions and wherein said still another signaling channel produces said data signal having said second format concurrently at said terminals of said first and second groups of remote locations effective to activate one load control function at said first group and the other load control function at said second group.

4. A radio communication system as claimed in claim 3 wherein one of said two different load controlling functions is effective to switch an associated electric load from an off to an on condition at said first group of remote locations and the other of said two load controlling functions is effective to concurrently switch an associated electric load from an on to an off condition, respectively, at said second group of remote locations.

5. A radio communication system as claimed in claim 3 wherein said still another signaling channel produces said common data signal to be applied to said control means at the management terminals of said first group of remote locations so as to switch electric heater devices at said first group of remote locations between connected and disconnected states with said distribution network, and for said data signal to be applied to said control means at the management terminals of said second group of remote locations so as to switch electric air conditioner devices thereat between connected and disconnected states with said distribution network.

6. A radio communication system as claimed in claim 1 wherein said plural data signals include one data signal having a predetermined data bit rate and said tone modulator means produces a single pair of two tone signals having each of said pair of two tone frequencies alternately occurring in response to the two binary levels occurring at said data bit rate of said one data signal with each of the pair of two tone frequencies being harmonically related to each other and to the predetermined data rate.

7. A radio communication system as claimed in claim 1 wherein one of said master and satellite transmitting means includes a stored source of said data signals designating preprogrammed energy usage related command functions with said stored source of data signals being activated for receipt by said tone modulator means thereof in response to a remote command signal.

8. A radio communication system for automated control of an electric power distribution network supplying electric energy to customer remote locations, said radio communication system comprising:

commercial VHF-FM broadcast signal transmitting means producing electromagnetic radiations extending to said remote locations;

first modulation means for modulating the transmitted broadcast signal with information included in a composite broadcast channel including both a broadcast station program main channel and an SCA auxiliary channel;

a source of binary data signals designating energy usage related command functions, said data signals varying between two binary levels at a rate defining a predetermined data bit rate with said data signals including either of two signal formats wherein a first signal format includes a predetermined number of data bits with at a portion thereof having a function code and a second signal format includes a continuous bit stream;

second modulation means for producing a pair of two tone signals having frequencies harmonically related to each other and to said predetermined data bit rate when produced to shift between the two tone signals in response to changes between the two levels of one of said data signals, said second modulation means including means for phase synchronizing the transitions occurring in the shifts between each of said pair of two tone frequencies in response to changes in the two levels of said one data signal;

third modulation means including a subcarrier included in said auxiliary channel with said subcarrier having a predetermined frequency wherein the subcarrier frequency is harmonically related to both the frequency values of said two tone signals of said one data signal, said third modulation means modulating said subcarrier with said pair of two tone signals of said second modulation means, the output of said third modulation means being applied to said first modulation means for modulating the information of said auxiliary channel on said transmitted broadcast signal; and

energy management terminal means located at said customer remote locations and including radio receiver means receiving said electromagnetic radiations, two tone detector means for detecting said one binary data signal, and control means having an energy usage related control function at an associated remote location with said control means being activated by said one of said data signals.

9. A radio communication system as claimed in claim 8 wherein said second modulation means includes a clock frequency source and first and second divider circuits responsive to signals produced by said clock frequency source to generate said pair of two tone signals at the outputs of said first and second divider circuits, and solid state switch means having two signal inputs separately receiving said pair of two tone signals, a signal output alternately connected to said inputs and further having a control input being operative in response to the two levels of said one data signal to alternately produce said two tone signals at the signal output thereof so that the end of one of the pair of tone signals has the same phase as the beginning of the other of the pair of tone signals to produce phased synchronized transitions between said pair of two tone signals at the output of said second modulation means.

10. A radio communication system as claimed in claim 9 wherein said second modulation means includes means producing pulses at a rate equal to said predetermined data bit rate in response to signals produced from said clock frequency source at a predetermined frequency divided value thereof and further includes circuit means for receiving said pulses and said one data signal and sequentially applying the level corresponding to the binary state of each bit of said one data signal to said control input of said solid state switch means at the rate of said pulses.