阅读说明：本技术 一种电力大数据全光采集设备及采集方法 (Electric power big data all-optical acquisition equipment and acquisition method ) 是由 韦朴 许恒飞 魏峘 黄进 王翀 王传君 张震 包永强 朱昊 于 2020-12-04 设计创作，主要内容包括：本发明公开了一种电力大数据全光采集设备及采集方法,采集设备包括中心节点、N个传感节点组和云平台,所述传感节点组与中心节点通过光纤连接,所述中心节点通过以太网与云平台连接；每个传感节点组包括至少一个传感节点,若包含两个以上传感节点,所述传感节点之间通过光纤依次连接；N为大于等于1的整数。本发明基于光波波长和调制频率实现对海量传感器的寻址,采用全光形式实现对各类传感器数据的采集和传输,具有不受电磁干扰、安全、可靠的优点,可广泛应用于电力物联网和电力大数据采集中。(The invention discloses electric power big data all-optical acquisition equipment and an acquisition method, wherein the acquisition equipment comprises a central node, N sensing node groups and a cloud platform, wherein the sensing node groups are connected with the central node through optical fibers, and the central node is connected with the cloud platform through an Ethernet; each sensing node group comprises at least one sensing node, and if the sensing node group comprises more than two sensing nodes, the sensing nodes are sequentially connected through optical fibers; n is an integer of 1 or more. The system and the method realize the addressing of mass sensors based on the light wave wavelength and the modulation frequency, realize the acquisition and transmission of various sensor data in an all-optical mode, have the advantages of no electromagnetic interference, safety and reliability, and can be widely applied to the power internet of things and the acquisition of power big data.)

1. The electric power big data all-optical acquisition equipment is characterized by comprising a central node (21), N sensing node groups and a cloud platform (23), wherein the sensing node groups are connected with the central node (21) through optical fibers, and the central node (21) is connected with the cloud platform (23) through an Ethernet; each sensing node group comprises at least one sensing node (22), and if more than two sensing nodes (22) are included, the sensing nodes (22) are sequentially connected through optical fibers; n is an integer of 1 or more.

2. The electric power big data all-optical acquisition device according to claim 1, wherein the sensing node (22) comprises a second optical circulator (8), a first wavelength division multiplexer (9), a second wavelength division multiplexer (10), a broadband light source (11), an optical power divider (12), an optical transmitter (13), a second optical detector (14), a driving circuit (15), a processor (16), a first optical communication interface (17), and a second optical communication interface (18); the electrical port of the processor (16) is connected with the input port of the driving circuit (15); the drive circuit (15) controls the output of the broadband light source (11); three optical ports of the second optical circulator (8) are respectively connected with an output optical port of the broadband light source (11), an input optical port of the second wavelength division multiplexer (10) and an optical port of the first wavelength division multiplexer (9); other optical ports of the first wavelength division multiplexer (9) are respectively connected with the optical ports of the optical power splitter (12); other optical ports of the optical power splitter (12) are connected with the optical port of the optical transmitter (13); other optical ports of the second wavelength division multiplexer (10) are respectively connected with an input port of a second optical detector (14); the output port of the second light detector (14) is connected with a processor (16); a first optical communication interface (17) and a second optical communication interface (18) are respectively arranged on the processor (16).

3. The electric power big data all-optical acquisition device according to claim 2, wherein the first wavelength division multiplexer (9) has N +1 optical ports, and the first wavelength division multiplexer (9) is connected with N optical power splitters (12) through the optical ports; the second wavelength division multiplexer (10) is provided with N +1 optical ports, and the second wavelength division multiplexer (10) is connected with N second optical detectors (14) through the optical ports; each optical power splitter (12) is provided with M +1 optical ports, and each optical power splitter (12) is connected with M optical transmitters (13) through the optical ports; each optical transmitter is connected with one sensor; in use, the number of sensors to which the sensing nodes (22) are linked is M · N.

4. The electric power big data all-optical acquisition device according to claim 3, wherein, in use, the first wavelength division multiplexer (9) is configured to divide a broadband light source (11) into N channels with different wavelengths, and each channel is connected to an optical power splitter (12); the optical power divider (12) is used for dividing input light into M parts and outputting the M parts of input light to the M optical transmitters (13) respectively.

5. The electric power big data all-optical acquisition device according to claim 2, wherein the optical transmitter (13) comprises a first optical circulator (1), a reflective optical modulator (2), a first optical detector (3), a filter (4), a switch (5), a signal conditioner (6) and a sensor (7), and an optical port of the first optical circulator (1) is connected with an input optical port of the first optical detector (3) and an output optical port of the optical power splitter (12); the output electric port of the first optical detector (3) is connected with the input interface of the filter (4), and the output interface of the filter (4) is connected with the input interface of the switch (5); two interfaces of the signal conditioner (6) are respectively connected with an output interface of the sensor (7) and an input interface of the switch (5); the input interface of the reflection type optical modulator (2) is connected with the output electrical interface of the switch (5), and the optical port of the reflection type optical modulator (2) is connected with the optical port of the first optical circulator (1).

6. The electric power big data all-optical acquisition device according to claim 5, characterized in that the optical transmitter (13) is provided with a set frequency ω, and the set frequencies of M optical transmitters (13) linked by one optical power splitter (12) are different and are sequentially set to ω₁～ω_M(ii) a The frequencies which can be passed by the filter (4) are all set frequencies.

7. The electric power big data acquisition device according to any of claims 3-6, characterized in that the sensor (7) is an electric signal sensor.

8. An electric power big data all-optical acquisition method, characterized in that the sensing signal acquisition method of the sensing node (22) in claims 1-7 comprises the following steps:

step one, the processor (16) converts a frequency into omega₁The sine modulation signal is sent to a drive circuit (15), the drive circuit (15) drives a broadband light source (11) to emit light wave power with the frequency of omega₁Sinusoidally varying broadband light waves;

step two, the second optical circulator (8) sends the received broadband light wave to a first wavelength division multiplexer (9), and separates the broadband light wave into N channels with different wavelengths, and the N channels are respectively sent to optical power splitters (12) with corresponding wavelengths; the optical power divider (12) divides the light wave equal power into M equal parts, and the M equal parts are respectively sent into an optical transmitter (13); then the processor (16) controls the drive circuit (15) to drive the broadband light source (11) to emit a direct current light wave without modulation;

thirdly, when the set frequency of the optical transmitter (13) is the same as the frequency of the incident light, the optical transmitter (13) reflects the sensing information collected by the sensor (7) back to the optical power divider (12) in a primary circuit, and the reflected signals are separated into N channels with different wavelengths in the second wavelength division multiplexer (10) after sequentially passing through the first wavelength division multiplexer (9) and the second optical circulator (8) and are sent to the second optical detector (14) with corresponding wavelengths; the light waves are converted into electric signals in a second light detector (14) and are sent into a processor (7);

step four, the processor (7) sends out the sensing data through a first optical communication interface (17); meanwhile, the second optical communication interface (18) receives the sensing data of other sensing nodes (22) and forwards the sensing data through the first optical communication interface (17); the data finally reach a central node (21), and the central node (21) sends the data to a remote cloud platform through the Ethernet;

fifthly, the processor adjusts the frequency of the sine modulation signal, the sine modulation signal with the changed frequency is sent to the driving circuit (15), and the driving circuit (15) drives the broadband light source (11) to emit broadband light waves with the light wave power changing in a sine mode; and repeating the second step to the fifth step until the data acquisition of all the sensors is completed.

9. The electric power big data all-optical acquisition method according to claim 8, wherein the processor adjusts the frequency of the sinusoidal modulation signal and sends the sinusoidal modulation signal with the changed frequency to the driving circuit (15), and specifically includes:

processor according to omega₂～ω_MSequentially adjusts the frequency of the sinusoidal modulation signal, and sends the sinusoidal modulation signal with the changed frequency to the drive circuit (15).

10. The electric power big data all-optical acquisition method according to claim 8, wherein the optical transmitter (13) reflects the sensing information collected by the sensor (7) back to the optical power splitter (12) in a primary path, and specifically comprises the following steps:

the method comprises the following steps that firstly, a first optical circulator (1) sends a received light wave signal into a first optical detector (3) to be converted into an electric signal; sending the electric signal into a filter (4), if the modulation frequency omega of the light wave is the same as the set frequency of the optical transmitter (13), the filter (4) outputs a signal to a switch (5), and the switch (5) is conducted;

step two, the sensing information of the sensor (7) is sent to an input port of the switch (5) after being conditioned by the signal conditioner (6), when the switch (5) is conducted, the conditioned sensing signal is sent to the reflection-type optical modulator (2), the reflection-type optical modulator (2) modulates the optical power of the optical wave, and the output optical power of the optical wave is in direct proportion to the incident sensing signal; the light waves are output outwards after passing through the first optical circulator (1).

Technical Field

The invention relates to the field of electric power big data acquisition, in particular to electric power big data all-optical acquisition equipment and an electric power big data all-optical acquisition method.

Background

With the development of power system automation and smart grids, the applications of smart electronic devices and monitoring sensors in power transmission and transformation equipment are increasingly widespread. In order to accurately monitor various physical quantities of electrical equipment, a large number of sensor nodes of various types are densely distributed in an area to be measured. The existing sensors and systems are mainly implemented based on electrical sensors, and the basic principle is to finally convert various types of physical quantities into analog or digital electrical signals, and finally transmit the electrical signals in a wired or wireless manner.

However, such a technical solution still has some defects, such as the electromagnetic environment of the power system is complex, and the reliability of the power system is difficult to guarantee by adopting the traditional wired or wireless communication mode. Although the all-fiber sensing technology adopts the optical fiber as a sensing and communication means, the all-fiber sensing technology can not be interfered by electromagnetism, and effectively solves the problems of an electronic sensing system, the optical fiber sensing system is expensive, difficult to be widely applied in a large scale in a short time, incapable of monitoring various physical quantities and incapable of realizing effective integration. Therefore, it is not feasible to replace the existing electronic sensors with optical fiber sensors on a large scale.

Therefore, an acquisition device and an acquisition method capable of realizing all-optical transmission of signals of various electric sensors through electric big data and a large number of electronic sensors applied in an electric internet of things are urgently needed.

Disclosure of Invention

Aiming at the defects, the invention provides the electric power big data all-optical acquisition equipment and the acquisition method, which realize data acquisition through the traditional electric signal sensor, but transmit through the optical fiber, ensure high reliability of acquisition in an electric power system and avoid the interference of an electromagnetic environment.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

on one hand, the embodiment of the invention provides electric power big data all-optical acquisition equipment which comprises a central node, N sensing node groups and a cloud platform, wherein the sensing node groups are connected with the central node through optical fibers, and the central node is connected with the cloud platform through an Ethernet; each sensing node group comprises at least one sensing node, and if the sensing node group comprises more than two sensing nodes, the sensing nodes are sequentially connected through optical fibers; n is an integer of 1 or more.

Preferably, the sensing node includes a second optical circulator, a first wavelength division multiplexer, a second wavelength division multiplexer, a broadband light source, an optical power splitter, an optical transmitter, a second optical detector, a driving circuit, a processor, a first optical communication interface, and a second optical communication interface; the electric port of the processor is connected with the input port of the driving circuit; the driving circuit controls to output a broadband light source; three optical ports of the second optical circulator are respectively connected with an output optical port of the broadband light source, an input optical port of the second wavelength division multiplexer and an optical port of the first wavelength division multiplexer; other optical ports of the first wavelength division multiplexer are respectively connected with the optical ports of the optical power splitters; other optical ports of the optical power splitter are connected with the optical port of the optical transmitter; other optical ports of the second wavelength division multiplexer are respectively connected with the input port of the second optical detector; the output port of the second optical detector is connected with the processor; the first optical communication interface and the second optical communication interface are respectively arranged on the processor.

Preferably, the first wavelength division multiplexer has N +1 optical ports, and the first wavelength division multiplexer is connected with the N optical power splitters through the optical ports; the second wavelength division multiplexer is provided with N +1 optical ports, and the second wavelength division multiplexer is connected with the N second optical detectors through the optical ports; each optical power splitter is provided with M +1 optical ports, and is connected with M optical transmitters through the optical ports; each optical transmitter is connected with one sensor; when the sensor node is used, the number of the sensors linked to the sensor node is M.N.

Preferably, when in use, the first wavelength division multiplexer is used for dividing the broadband light source into N channels with different wavelengths, and each channel is connected with one optical power splitter; the optical power divider is used for dividing input light into M parts and outputting the M parts of the input light to the M optical transmitters respectively.

Preferably, the optical transmitter includes a first optical circulator, a reflective optical modulator, a first optical detector, a filter, a switch, a signal conditioner, and a sensor, where an optical port of the first optical circulator is connected to an input optical port of the first optical detector and an output optical port of the optical power splitter; the output electric port of the first optical detector is connected with the input interface of the filter, and the output interface of the filter is connected with the input interface of the switch; two interfaces of the signal conditioner are respectively connected with an output interface of the sensor and an input interface of the switch; the input interface of the reflection type optical modulator is connected with the output electrical interface of the switch, and the optical port of the reflection type optical modulator is connected with the optical port of the first optical circulator.

Preferably, the optical transmitter is provided with a set frequency ω, and the set frequencies of the M optical transmitters linked to one optical power splitter are different and are sequentially set to ω₁～ω_M(ii) a The frequencies which can be passed by the filter are all set frequencies.

Preferably, the sensor is an electrical signal sensor.

On the other hand, the embodiment of the invention also provides an electric power big data all-optical acquisition method, which comprises the following steps:

step one, the processor converts a frequency into omega₁The sine modulation signal is sent to a driving circuit, and the driving circuit drives a broadband light source to emit light wave power with the frequency of omega₁Sinusoidally varying broadband light waves;

step two, the second optical circulator sends the received broadband light wave to the first wavelength division multiplexer, and separates the broadband light wave into N channels with different wavelengths, and the N channels are respectively sent to optical power splitters with corresponding wavelengths; the optical power divider divides the light wave equal power into M equal parts, and the M equal parts are respectively sent into an optical transmitter; then the processor controls the drive circuit to drive the broadband light source to emit a direct current light wave without modulation;

thirdly, when the set frequency of the optical transmitter is the same as the frequency of the incident light, the optical transmitter reflects the sensing information collected by the sensor back to the optical power divider in an original circuit, and the reflected signal is separated into N channels with different wavelengths again in the second wavelength division multiplexer after sequentially passing through the first wavelength division multiplexer and the second optical circulator and is sent to a second optical detector with the corresponding wavelength; the light waves are converted into electric signals in the second optical detector and are sent into the processor;

the processor sends the sensing data out through a first optical communication interface; meanwhile, the second optical communication interface receives sensing data of other sensing nodes and forwards the sensing data through the first optical communication interface; the data finally reach a central node, and the central node sends the data to a remote cloud platform through the Ethernet;

fifthly, the processor adjusts the frequency of the sine modulation signal and sends the sine modulation signal with changed frequency to the driving circuit, and the driving circuit drives the broadband light source to emit broadband light waves with light wave power changing frequency in a sine mode; and repeating the second step to the fifth step until the data acquisition of all the sensors is completed.

Further, the processor adjusts the frequency of the sinusoidal modulation signal and sends the sinusoidal modulation signal with the changed frequency to the driving circuit, and the method specifically includes:

processor according to omega₂～ω_MSequentially adjusting the frequency of the sinusoidal modulation signals, and sending the sinusoidal modulation signals with changed frequency to the driving circuit.

Further, the optical transmitter reflects the sensing information collected by the sensor back to the optical power splitter in the original way, and specifically includes the following steps:

the method comprises the following steps that firstly, a first optical circulator sends a received optical wave signal into a first optical detector to be converted into an electric signal; sending the electric signal into a filter, and if the modulation frequency omega of the light wave is the same as the set frequency of the optical transmitter, outputting a signal to a switch by the filter to switch on the switch;

step two, the sensing information of the sensor is sent to an input port of the switch after being conditioned by the signal conditioner, when the switch is conducted, the conditioned sensing signal is sent to the reflection-type optical modulator, the reflection-type optical modulator modulates the optical power of the optical wave, and the output optical power of the optical wave is in direct proportion to the incident sensing signal; the light wave is output outwards after passing through the first optical circulator.

Compared with the prior art, the electric power big data all-optical acquisition equipment and the electric power big data all-optical acquisition method can realize data acquisition through a traditional electric signal sensor, but transmit through optical fibers, ensure high reliability of acquisition in an electric power system, and are not interfered by an electromagnetic environment. The electric power big data all-optical acquisition equipment and the acquisition method comprise a central node, N sensing node groups and a cloud platform, wherein the sensing node groups are connected with the central node through optical fibers, and the central node is connected with the cloud platform through an Ethernet; each sensing node group comprises at least one sensing node, and if the sensing node group comprises more than two sensing nodes, the sensing nodes are sequentially connected through optical fibers; n is an integer of 1 or more. By improving the sensing node, a novel optical transmitter is adopted to convert the analog or digital electric signal output by the sensor into an optical signal and transmit the optical signal through an optical fiber. Meanwhile, a double addressing mode based on the wavelength of the light wave and the modulation frequency is provided, and the problem of addressing a large number of sensors is solved. The scheme adopts optical fibers to realize all-optical data acquisition and transmission for a large number of existing sensors in the power system. Compared with an electronic sensing system, the scheme has the advantages of electromagnetic interference resistance, long transmission distance, safety, reliability and the like. Compared with an optical fiber sensing system, the scheme has the advantages of low cost and realization of sensing of various types of physical quantities.

Drawings

Fig. 1 is a schematic overall structural diagram of an all-optical acquisition device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a sensor node according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an optical transmitter according to an embodiment of the present invention.

The figure shows that: the system comprises a first optical circulator 1, a second reflective optical modulator 2, a first optical detector 3, a filter 4, a switch 5, a signal conditioner 6, a sensor 7, a second optical circulator 8, a first wavelength division multiplexer 9, a second wavelength division multiplexer 10, a broadband light source 11, an optical power divider 12, an optical transmitter 13, a second optical detector 14, a driving circuit 15, a processor 16, a first optical communication interface 17, a second optical communication interface 18, a central node 21, a sensing node 22 and a cloud platform 23.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the electric power big data all-optical acquisition device according to the embodiment of the present invention includes a central node 21, N sensing node groups and a cloud platform 23, where the sensing node groups are connected to the central node 21 through an optical fiber, and the central node 21 is connected to the cloud platform 23 through an ethernet; each sensing node group comprises at least one sensing node 22, and if more than two sensing nodes 22 are included, the sensing nodes 22 are sequentially connected through optical fibers; n is an integer of 1 or more.

The sensing information of the sensing nodes 22 downstream of the sensing node group is sent to the upstream sensing nodes 22 through optical fibers, the optical fibers between the sensing nodes 22 are only used for forwarding the sensing information to the central node 21, and no processing is performed on the sensing information in the forwarding process.

In the electric power big data all-optical acquisition device of the above embodiment, as shown in fig. 2, preferably, the sensing node 22 includes a second optical circulator 8, a first wavelength division multiplexer 9, a second wavelength division multiplexer 10, a broadband light source 11, an optical power splitter 12, an optical transmitter 13, a second optical detector 14, a driving circuit 15, a processor 16, a first optical communication interface 17, and a second optical communication interface 18; the electrical port of the processor 19 is connected with the input port of the driving circuit 15; the driving circuit 15 controls the output broadband light source 11; three optical ports of the second optical circulator 8 are respectively connected with an output optical port of the broadband light source 11, an input optical port of the second wavelength division multiplexer 10 and an optical port of the first wavelength division multiplexer 9; the other optical ports of the first wavelength division multiplexer 9 are respectively connected with the optical ports of the optical power splitter 12; the other optical ports of the optical power splitter 12 are connected with the optical port of the optical transmitter 13; the other optical ports of the second wavelength division multiplexer 10 are respectively connected with the input port of the second optical detector 14; an output port of the second photodetector 14 is connected to a processor 16; a first optical communication interface 17 and a second optical communication interface 18 are respectively provided on the processor 16.

Preferably, the first wavelength division multiplexer 9 has N +1 optical ports, and the first wavelength division multiplexer 9 is connected to the N optical power splitters 12 through the optical ports; the second wavelength division multiplexer 10 has N +1 optical ports, and the second wavelength division multiplexer 10 is connected with N second optical detectors 14 through the optical ports; each optical power splitter 12 has M +1 optical ports, and each optical power splitter 12 is connected to M optical transmitters 13 through an optical port; each optical transmitter 13 is connected with one sensor 7; in use, the number of sensors 7 to which the sensing node 22 is linked is M · N.

The processor 16 can simultaneously link the M · N optical transmitters 13, that is, the M · N sensors 7, through the N +1 optical ports of the wavelength division multiplexer and the M +1 optical ports of the optical power splitter 12, so that the sensing node 22 can simultaneously acquire sensing information of the M · N sensors 7. It should be noted that, in the prior art, the wavelength division multiplexer can be simultaneously connected to 512 optical power splitters 12; the optical power splitter 12 can be connected to 128 optical transmitters 13 at the same time. Therefore, one sensing node 22 can simultaneously acquire the sensing information of 512 × 128 sensors 7, and the effect of large data acquisition is achieved.

Preferably, when in use, the first wavelength division multiplexer 9 is configured to divide the broadband light source 11 into N channels with different wavelengths, and each channel is connected to one optical power splitter 12; the optical power splitter 12 is configured to split input light into M parts, and output the M parts to M optical transmitters 13, respectively.

By arranging the first wavelength division multiplexer 9 and the N optical power splitters 12, a two-layer addressing mode is formed, different optical power splitters 12 can be addressed through different wavelengths, and then the corresponding optical transmitters 13 can be addressed through different frequencies. The dual addressing can realize the addressing of a large number of sensors 7, ensure that any sensor 7 can be accurately addressed under the condition of linking a large number of sensors 7, and collect the sensing information of all linked sensors 7.

As shown in fig. 3, preferably, the optical transmitter 13 includes a first optical circulator 1, a reflective optical modulator 2, a first optical detector 3, a filter 4, a switch 5, a signal conditioner 6, and a sensor 7, where an optical port of the first optical circulator 1 is connected to an input optical port of the first optical detector 3 and an output optical port of the optical power splitter 12; an output electric port of the first optical detector 3 is connected with an input interface of a filter 4, and an output interface of the filter 4 is connected with an input interface of a switch 5; two interfaces of the signal conditioner 6 are respectively connected with an output interface of the sensor 7 and an input interface of the switch 5; the input interface of the reflective optical modulator 2 is connected with the output electrical interface of the switch 5, and the optical port of the reflective optical modulator 2 is connected with the optical port of the first optical circulator 1.

The first optical detector 3 is arranged to convert the light wave signals received from the first optical circulator 1 into electrical signals; the signal conditioner 6 is arranged to condition the sensing information acquired by the sensor 7; the reflective optical modulator 2 is used to output a light wave whose output optical power is proportional to the incident signal. The analog or digital signal output by the sensor 7 is conditioned and sent to the switch 5. When the switch 5 is opened, a signal is sent. If the switch 5 is closed, the signal is not sent out.

Preferably, the optical transmitter 13 is provided with a set frequency ω, and the set frequencies of M optical transmitters 13 linked to one optical power splitter 12 are different from each other and are sequentially set to ω₁～ω_M(ii) a The frequencies that the filter 4 can pass are all set frequencies.

By setting the frequency omega₁～ω_MM optical transducers 13 are distinguished as the basis for addressing. The electrical signal output by the first photodetector 3 passes through a filter 4, and turns on a switch 5 if the frequency is a set frequency. It should be noted that the set frequency of the optical transmitter 13 in each wavelength channel is different; the set frequency of optical transmitter 13 may be the same in different wavelength channels.

Preferably, the sensor 7 is an electrical signal sensor 7. By adopting the electric signal sensor 7, the arranged electric signal sensor 7 can be transformed, the arrangement cost is low, and the operation is convenient. Meanwhile, it should be noted that, in this embodiment, a mode of converting analog or digital signals output by various sensors 7 into optical power signals is adopted, so that transmission from optical fibers to the sensing node 22 is solved, and all-optical data acquisition and transmission are realized for a large number of existing sensors 7 in the power system by adopting optical fibers, so that the method has the advantages of electromagnetic interference resistance, long transmission distance, safety, reliability and the like. Meanwhile, the scheme of the embodiment has low cost and can realize sensing of various physical quantities.

Regarding the above all-optical acquisition device for big electric data, an embodiment of the present invention employs an all-optical acquisition method for big electric data, which includes the following steps:

step one, the processor 16 converts a frequency into ω₁The sine modulation signal is sent to the driving circuit 15, and the driving circuit 15 drives the broadband light source 11 to emit light wave power with the frequency of omega₁Sinusoidally varying broadband light waves;

step two, the second optical circulator 8 sends the received broadband light wave to the first wavelength division multiplexer 9, and separates the broadband light wave into N channels with different wavelengths, and sends the channels into optical power splitters 12 with corresponding wavelengths respectively; the optical power divider 12 divides the light wave equal power into M equal parts, and the M equal parts are respectively sent into an optical transmitter 13; the processor 16 then controls the driving circuit 15 to drive the broadband light source 11 to emit a non-modulated direct current light wave;

step three, when the set frequency of the optical transmitter 13 is the same as the frequency of the incident light, the optical transmitter 13 reflects the sensing information collected by the sensor 7 back to the optical power splitter 12, and the reflected signal passes through the first wavelength division multiplexer 9 and the second optical circulator 8 in sequence, and is separated into N channels with different wavelengths again in the second wavelength division multiplexer 10, and is sent to the second optical detector 14 with the corresponding wavelength; the light waves are converted into electrical signals in the second photodetector 14 and sent to the processor 16;

step four, the processor 16 sends out the sensing data through the first optical communication interface 17; meanwhile, the second optical communication interface 18 receives the sensing data of other sensing nodes 22 and forwards the sensing data through the first optical communication interface 17; the data finally reach the central node 21, and the central node 21 sends the data to the remote cloud platform 23 through the ethernet;

step five, the processor 16 adjusts the frequency of the sine modulation signal, and sends the sine modulation signal with changed frequency to the driving circuit 15, and the driving circuit 15 drives the broadband light source 11 to emit the broadband light wave with the light wave power changing in a sine way; and repeating the second step to the fifth step until the data acquisition of all the sensors 7 is completed.

The processor 16 circularly drives the broadband light source 11 to emit variable broadband light waves and unmodulated direct current light waves according to different frequencies, and sequentially addresses all the optical transmitters 13; the method can ensure that only the sensing information returned by the optical transmitter 13 with the same set frequency is received at each time, and simultaneously the set frequencies of the optical transmitters 13 linked with the same optical power divider 12 are different, thereby ensuring that only the sensing information transmitted by one optical transmitter 13 under the same optical power divider 12 is acquired at each time. Finally, according to the circulation, all the sensing information can be collected.

Further, the processor 16 adjusts the frequency of the sinusoidal modulation signal, and sends the sinusoidal modulation signal with the changed frequency to the driving circuit 15, which specifically includes:

processor 16 according to omega₂～ω_MThe frequency of the sinusoidal modulation signal is sequentially adjusted, and the sinusoidal modulation signal with the changed frequency is sent to the drive circuit 15.

By following omega₂～ω_MThe sequence of (a) and (b) can ensure that all optical transmitters 13 can be addressed and all sensing information can be collected.

Further, the optical transmitter 13 reflects the sensing information collected by the sensor 7 back to the optical power splitter 12, which specifically includes the following steps:

step one, the first optical circulator 1 sends the received optical wave signal into a first optical detector 3 to be converted into an electric signal; sending the electric signal into the filter 4, if the modulation frequency omega of the light wave is the same as the set frequency of the optical transmitter 13, the filter 4 outputs a signal to the switch 5, and the switch 5 is turned on;

step two, the sensing information of the sensor 7 is sent to an input port of the switch 5 after being conditioned by the signal conditioner 6, when the switch 5 is conducted, the conditioned sensing signal is sent to the reflective light modulator 2, the reflective light modulator 2 modulates the light power of the light wave, and the output light power of the light wave is in direct proportion to the incident sensing signal; the light wave is output outwards after passing through the first optical circulator 1.

The analog or digital signal output by the sensor 7 is conditioned and sent to the switch 5. This part of the operation is independent and is related to the operating state of the sensor 7, when the switch 5 is open, a signal is sent out, and if the switch 5 is closed, a signal is not sent out.

Compared with the prior art, the electric power big data all-optical acquisition equipment and the acquisition method thereof convert analog or digital electric signals output by the sensor into optical signals by improving the sensing node and adopting a novel optical transmitter, and transmit the optical signals through optical fibers. Meanwhile, a double addressing mode based on the wavelength of the light wave and the modulation frequency is provided, and the problem of addressing a large number of sensors is solved. The scheme adopts the optical fiber to realize all-optical data acquisition and transmission of a large number of existing sensors in the power system, and has the advantages of electromagnetic interference resistance, long transmission distance, safety, reliability and the like compared with an electronic sensing system. Compared with an optical fiber sensing system, the optical fiber sensing system has the advantages of low cost and realization of sensing of various physical quantities.

The foregoing shows and describes the general principles, features and advantages of the present invention. It will be understood by those skilled in the art that the present design is not limited to the embodiments described above, which are merely illustrative of the principles of the design, but that various changes and modifications may be made without departing from the spirit and scope of the design, which fall within the scope of the claimed design. The scope of the invention is defined by the appended claims and equivalents thereof.