CN111198289A - A kind of control method of fiber optic current measuring device - Google Patents
A kind of control method of fiber optic current measuring device Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 abstract description 11
- 230000008859 change Effects 0.000 abstract description 8
- 230000032683 aging Effects 0.000 abstract description 6
- 238000012545 processing Methods 0.000 description 24
- 238000005070 sampling Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 6
- 230000010287 polarization Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
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- 230000033228 biological regulation Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/44—Modifications of instruments for temperature compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/248—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using a constant light source and electro-mechanically driven deflectors
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Abstract
The invention relates to the technical field of current detection equipment, in particular to a control method of an optical fiber type current measuring device. The method comprises the steps of obtaining actual optical power received by a detector in a current measuring device, adjusting working current of a light source according to the error between the actual optical power and standard optical power to enable the actual optical power received by the detector to fall within a set range of the standard optical power, wherein the standard optical power is optical power corresponding to the optimal signal-to-noise ratio of the matched detector, adjusting the working current of the light source according to the deviation between the actual optical power and the standard optical power to enable the emitted optical power of the light source to be increased or reduced so as to offset the influence of noise such as optical path attenuation and the like caused by aging of an optical fiber device or temperature change on signals received by the detector, improving the accuracy of a detection result of the detector and enabling the reliability of the current measuring; in addition, a manual adjustment mode is adopted when problems occur, so that the current measuring device is convenient to operate and manage.
Description
Technical Field
The invention relates to the technical field of current detection equipment, in particular to a control method of an optical fiber type current measuring device.
Background
The direct current measuring device is always a core unit in a conventional direct current and flexible power transmission system, and is mainly divided into two measuring devices, namely a shunt and an all-fiber current transformer at present. The all-fiber current transformer is widely applied to various fields due to the advantages of high response speed, large dynamic measurement range, wide frequency response range and the like. With the increasing number of all-fiber current transformers, some problems are gradually highlighted.
Especially, the failure rate of the optical fiber loop is high, and the optical fiber loop is the physical basis for realizing current transmission of the all-fiber current transformer and directly influences the operation reliability and stability of the all-fiber current transformer. With the continuous improvement of the requirements on the operation and maintenance reliability of the current measuring device in flexible power transmission and conventional direct-current power transmission systems, the online monitoring function of the active optical device and the change situation of the total optical path loss is optimized and perfected, and the method is of great importance to the popularization and application of the all-fiber current transformer. However, the current all-fiber current transformer only realizes on-line monitoring of the operation condition of the light path through the final detector at the same end of the light source, and when the output signal of the detector is abnormal or no light is output, the whole light path can be judged to be in fault, but the light source and the loss change of the light path cannot be further analyzed.
The invention patent document with Chinese patent grant publication No. CN105467188B discloses an all-fiber current sensor adopting sectional type light path fault diagnosis, wherein a first photoelectric detector connected with a first optical splitter is arranged on a return light path, the first photoelectric detector is sequentially connected with a first AD sampling circuit and a digital signal processing circuit, and a hollow arm of the first optical splitter is sequentially connected with a second photoelectric detector and a second AD sampling circuit; the light path among the light source, the first optical splitter, the first photoelectric detector and the second photoelectric detector is a light source section, and other light paths are non-light source sections; the light path state detection and processing circuit comprises a first AD sampling circuit, a second AD sampling circuit, a light source section and a non-light source section, and is characterized by further comprising a sectional type light path state detection and processing circuit, wherein the first AD sampling circuit and the second AD sampling circuit are connected with the sectional type light path state detection and processing circuit, and light path fault information is collected through the first AD sampling circuit and the second AD sampling circuit and then transmitted to the sectional type light path state detection and processing circuit to be subjected to light path state diagnosis and processing of the light source section. The all-fiber current sensor can effectively give out a fault diagnosis result and is beneficial to normal operation of the current sensor, but because a light source needs to work for a long time, the loss of an optical fiber loop can be increased or reduced due to temperature change or aging of an optical fiber, the accuracy of the measurement value of the first photoelectric detector is lower and the reliability is poorer at the moment, certain influence can be caused on the fault diagnosis result, and when the current sensor is used, the measurement error caused by the reason is larger, the measurement result is inaccurate, and the normal use of the current sensor is influenced.
Disclosure of Invention
The invention aims to provide a control method of an optical fiber type current measuring device, which is used for solving the problem that the reliability of the current measuring device is poor due to inaccurate detection results caused by temperature change or optical fiber aging of the existing all-optical fiber current measuring device.
In order to realize the light source control of the optical fiber type current measuring device and solve the problem that the current measuring device has poor reliability due to inaccurate detection result caused by the influence of temperature change or optical fiber aging of the existing all-optical fiber current measuring device; the invention provides a control method of an optical fiber type current measuring device, which comprises the following steps:
1) at least acquiring actual optical power received by a detector in the current measuring device;
2) and adjusting the working current of the light source according to the error between the actual optical power and the standard optical power, so that the actual optical power received by the detector is within the set range of the standard optical power, wherein the standard optical power is the optical power corresponding to the optimal signal-to-noise ratio of the matched detector.
The method has the advantages that the working current of the light source is adjusted according to the deviation of the actual optical power and the standard optical power, so that the transmitting optical power of the light source is increased or reduced, the influence of noise such as optical path attenuation and the like caused by aging of an optical fiber device or temperature change on the received signal of the detector is counteracted, the optimal signal-to-noise ratio of the matched detector is realized, the accuracy of the detection result of the detector is improved, and the reliability of the current measuring device is obviously improved; in addition, a manual adjustment mode is adopted when problems occur, so that the current measuring device is convenient to operate and manage.
Further, in order to ensure that the light source is in a normal working temperature state and the light emitting center wavelength of the light source is stable, the control method also obtains the actual temperature of the light source in the current measuring device, and adjusts the temperature of the light source according to the error between the actual temperature and the standard temperature so that the temperature of the light source is in the set range of the standard temperature.
Further, in order to simply and accurately realize that the actual optical power falls within the set range of the standard optical power, the operating current of the light source is adjusted according to the error between the actual optical power and the standard optical power in step 2), and the actual optical power received by the detector falls within the set range of the standard optical power through PID control.
Further, in order to simply and accurately realize that the temperature of the light source falls within the set range of the standard temperature, the temperature of the light source is adjusted according to the error between the actual temperature and the standard temperature, and the temperature of the light source is controlled to be within the set range of the standard temperature through PID control.
The invention provides an optical fiber type current measuring device which comprises a light source, a polarization-maintaining optical fiber beam splitter, a detector and a sensing optical path for measuring current, wherein the light source is connected with an optical signal input end of the polarization-maintaining optical fiber beam splitter; the signal output end of the detector is connected with the processor, the signal output end of the processor is connected with the light source, and the working current of the light source is adjusted according to the error between the actual optical power and the standard optical power, so that the actual optical power received by the detector is within the set range of the standard optical power, wherein the standard optical power is the optical power corresponding to the optimal signal-to-noise ratio of the matched detector; the working current of the light source is adjusted according to the deviation of the actual optical power and the standard optical power, so that the transmitting optical power of the light source is increased or reduced, the influence of noise such as optical path attenuation and the like caused by the aging of an optical fiber device or temperature change on a signal received by the detector is counteracted, the optimal signal-to-noise ratio of the detector is matched, the accuracy of a detection result of the detector is improved, and the reliability of the current measuring device is obviously improved; in addition, a manual adjustment mode is adopted when problems occur, so that the current measuring device is convenient to operate and manage.
Furthermore, in order to ensure that the light source is in a normal working temperature state, so that the light-emitting center wavelength of the light source is stable, and the reliability of the device is improved, the current measuring device further comprises a temperature sensor for detecting the actual temperature of the light source and a temperature control device for adjusting the temperature of the light source, the signal input end of the processor is connected with the temperature sensor, the signal output end of the processor is also connected with the temperature control device, and the temperature of the light source is adjusted according to the error between the actual temperature and the standard temperature so that the temperature of the light source is in a set range of the standard temperature.
Further, in order to be better suitable for the existing detector, the control is carried out under the condition that the existing current measuring device is not changed as much as possible, and the processor comprises an AD module, a signal processing circuit and a storage module; the signal output end of the detector is connected with the AD module, the AD module is used for converting an optical power signal into an optical power digital quantity, the digital signal output end of the AD module is connected with the first input end of the signal processing circuit, the second input end of the signal processing circuit is connected with the storage module, and the signal output end of the AD module is used for acquiring a standard optical power digital quantity stored in the storage module and a set range of standard optical power; the output end of the signal processing circuit is connected with the light source.
Further, in order to ensure the reliability of the optical signal of the current measuring device and improve the service life of the current measuring device, the light source is an SLD light source, and the SLD light source comprises a controller, an SLD driving circuit and an SLD connected with the SLD driving circuit; the output end of the signal processing circuit is connected with the controller, and the output end of the controller is connected with the SLD driving circuit so as to realize the current regulation of the SLD.
Further, in order to simply realize the control of the SLD light source, the controller is a PID controller.
Drawings
FIG. 1 is a schematic connection diagram of an optical fiber type current measuring device according to the present invention;
FIG. 2 is a schematic view showing the connection of a temperature control part of a light source in an optical fiber type current measuring apparatus according to the present invention;
in the figure, 1, SLD; 2. a polarization maintaining fiber beam splitter; 3. a detector; 4. a first AD module; 5. a signal processing circuit; 6. a first PID controller; 7. an SLD drive circuit; 8. a monitoring module; 9. a thermistor; 10. a temperature acquisition bridge circuit; 11. a second AD module; 12. a second PID controller; 13. a TEC drive circuit; 14. and (4) TEC.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Method embodiment
The invention provides a control method of an optical fiber type current measuring device, which comprises the following steps:
1) at least acquiring actual optical power received by a detector in the current measuring device;
2) and adjusting the working current of the light source according to the error between the actual optical power and the standard optical power, so that the actual optical power received by the detector is within the set range of the standard optical power, wherein the standard optical power is the optical power corresponding to the optimal signal-to-noise ratio of the matched detector.
The standard optical power is the corresponding optical power when the detector is in the optimal signal-to-noise ratio, and according to different detectors or different light path structures, the standard optical power is different, and the optical power corresponding to the optimal signal-to-noise ratio under the current detector is obtained by testing after the measurement light path is built, namely the standard optical power.
The control method can directly regulate the working current of the light source by comparing the standard light power with the actual light power, so that the light power of the light source is changed to reach the standard of normal work; in addition, the control method can convert the acquired standard optical power and the actual optical power into digital quantity to be compared under the current measuring device. Wherein, the control can adopt PID control.
In addition, the control method also acquires the actual temperature of the light source in the current measuring device, and adjusts the temperature of the light source according to the error between the actual temperature and the standard temperature to enable the temperature of the light source to be within the set range of the standard temperature, such as 25 ℃, so that the light emitting center wavelength of the light source is stable. Wherein, the control can adopt PID control.
Device embodiment
The method in the above method embodiment of the present invention can be applied to most of the optical fiber type current measuring devices, and the present invention provides an optical fiber type current measuring device to use the above method, but the above method is not limited to the present device.
The invention provides an optical fiber type current measuring device, as shown in fig. 1, which comprises a light source, a polarization maintaining optical fiber beam splitter 2, a detector 3 and a sensing light path for measuring current, wherein the light source is connected with an optical signal input end of the polarization maintaining optical fiber beam splitter 2, an optical signal at a first optical signal output end of the polarization maintaining optical fiber beam splitter 2 passes through the sensing light path and returns, and the returned optical signal is transmitted to the detector 3 from a second optical signal output end of the polarization maintaining optical fiber beam splitter 2; the signal output end of the detector 3 is connected with the processor, the signal output end of the processor is connected with the light source, the working current of the light source is adjusted according to the error between the actual optical power and the standard optical power, so that the actual optical power received by the detector 3 is within the set range of the standard optical power, wherein the standard optical power is the optical power corresponding to the optimal signal-to-noise ratio of the matched detector 3.
The preferred processor comprises a first AD module 4, a signal processing circuit 5 and a memory module; the signal output end of the detector 3 is connected with a first AD module 4, the first AD module 4 is used for converting an optical power signal into an optical power digital quantity, the digital signal output end of the first AD module 4 is connected with the first input end of a signal processing circuit 5, the second input end of the signal processing circuit 5 is connected with a storage module, and the signal output end of the first AD module is used for acquiring a standard optical power digital quantity stored in the storage module and a set range of standard optical power; the output end of the signal processing circuit 5 is connected with the light source.
Preferably, the light source is an SLD light source, which includes a controller, an SLD driving circuit 7, and an SLD 1 connected to the SLD driving circuit 7; the output end of the signal processing circuit 5 is connected with a controller, and the output end of the controller is connected with an SLD driving circuit 7 so as to realize the current regulation of the SLD 1, wherein the controller is a first PID controller 6.
The current measuring device further comprises a monitoring module 8, and the digital quantity can be displayed on a visual interface in real time through the monitoring module 8.
The overall adaptive control method of the power supply of the device is explained as follows:
the method comprises the steps that an initial value of working current of an SLD 1 is set firstly, a signal processing circuit 5 drives an SLD driving circuit 7 to apply the initial value of the working current to the SLD 1 through a first PID controller 6, the SLD 1 emits light, the light emitted by the SLD 1 returns to a polarization maintaining optical fiber beam splitter 2 after current information is collected through a sensing light path, the light is converted into an original digital quantity through a detector 3 and a first AD module 4 and enters the signal processing circuit 5, the digital quantity is displayed on a visual interface in real time through a monitoring module 8 by the signal processing circuit 5, wherein the original digital quantity is in linear relation with the receiving light power of the detector 3 and is related to a photoelectric conversion coefficient of the detector 3 and a gain coefficient of a preposed amplifying circuit.
Under the normal condition mentioned in the above method embodiment, by adjusting the working current of the SLD 1, the optical power of the optical signal that reaches the detector 3 after going back and forth through the optical fiber loop can match the optimal snr receiving value of the detector 3, and the corresponding standard optical power or standard optical power digital quantity V0 at this time is obtained, and V0 is used as the operating point of the optical power adaptive system.
The set optical power standard value is V0, and when the return optical power changes due to the optical path loss, the signal processing circuit 5 compares the received changed digital quantity with V0 to obtain an optical power error signal. The first PID controller 6 drives the SLD drive circuit 7 to correct the working current of the SLD 1, and adjusts the luminous power of the SLD 1, so that the receiving light power of the detector 3 is servo-controlled to be close to V0, and the self-adaptive control of the light power is realized.
The current measuring device further comprises a temperature sensor for detecting the actual temperature of the light source and a temperature control device for adjusting the temperature of the light source, the signal input end of the processor is connected with the temperature sensor, the signal output end of the processor is further connected with the temperature control device, and the temperature of the light source is adjusted according to the error between the actual temperature and the standard temperature to enable the temperature of the light source to be within the set range of the standard temperature.
As shown in fig. 2, the processor further includes a second AD module 11, the second AD module 11 is connected to the signal processing circuit 5, the temperature sensor is composed of a thermistor 9 and a temperature acquisition bridge circuit 10, the thermistor 9 is close to the die of the SLD light source, the resistance value of the temperature acquisition bridge circuit 10 is reduced along with the rise of the temperature, the temperature acquisition bridge circuit 10 is connected with the thermistor 9, real-time temperature information is converted into digital signals through the second AD module 11 and fed back to the signal processing circuit 5, the signal processing circuit 5 obtains a temperature error signal through the comparison and analysis of the standard temperature, namely the set temperature and the actual temperature, and the second PID controller 12 drives the TEC drive circuit 13 to apply a forward (cooling) or reverse (heating) current to the TEC 14, thereby accurately controlling the temperature of the SLD light source and operating the SLD light source within a predetermined range, for example, around 25 ℃.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. The technical means in the above embodiments are changed, replaced, modified in a manner that will be easily imaginable to those skilled in the art, and the functions of the technical means are substantially the same as those of the corresponding technical means in the present invention, and the objectives of the invention are also substantially the same, so that the technical solution formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (4)
1. A control method of an optical fiber type current measuring device is characterized by comprising the following steps:
1) at least acquiring actual optical power received by a detector in the current measuring device;
2) and adjusting the working current of the light source according to the error between the actual optical power and the standard optical power, so that the actual optical power received by the detector is within the set range of the standard optical power, wherein the standard optical power is the optical power corresponding to the optimal signal-to-noise ratio of the matched detector.
2. The method of claim 1, further comprising obtaining an actual temperature of the light source in the current measuring device, and adjusting the temperature of the light source according to a difference between the actual temperature and the standard temperature to make the temperature of the light source within a predetermined range of the standard temperature.
3. The method for controlling the optical fiber type current measuring device according to claim 1 or 2, wherein the operating current of the light source is adjusted according to the error between the actual optical power and the standard optical power in step 2), and the actual optical power received by the detector is controlled by PID to fall within the set range of the standard optical power.
4. The method of claim 2, wherein the light source temperature is adjusted according to the difference between the actual temperature and the standard temperature, and the light source temperature is controlled to be within the set range of the standard temperature by PID control.
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Cited By (5)
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| CN112433082A (en) * | 2020-10-30 | 2021-03-02 | 国网山东省电力公司青岛供电公司 | Optical fiber voltage measuring system and method |
| CN112651498A (en) * | 2020-09-22 | 2021-04-13 | 杭州杭越传感科技有限公司 | Method and device for improving temperature stability of self-learning current sensor |
| CN113960346A (en) * | 2021-09-23 | 2022-01-21 | 国网江苏省电力有限公司电力科学研究院 | Light source timely constant power control device and method applied to optical fiber current transformer |
| CN114860002A (en) * | 2022-05-19 | 2022-08-05 | 国网智能电网研究院有限公司 | Temperature control method and device for semiconductor light source in optical fiber current transformer |
| CN115309230A (en) * | 2022-08-23 | 2022-11-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for controlling return light power of closed-loop all-fiber current transformer |
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| CN112651498A (en) * | 2020-09-22 | 2021-04-13 | 杭州杭越传感科技有限公司 | Method and device for improving temperature stability of self-learning current sensor |
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| CN115309230A (en) * | 2022-08-23 | 2022-11-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for controlling return light power of closed-loop all-fiber current transformer |
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Application publication date: 20200526 |