CN105242227A - Fiber current transformer model characteristic evaluation method based on virtual apparatus technology - Google Patents
Fiber current transformer model characteristic evaluation method based on virtual apparatus technology Download PDFInfo
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Abstract
Provided is a fiber current transformer model characteristic evaluation method based on a virtual apparatus technology. The method includes the steps: building a mathematic closed loop control model of a fiber current transformer through a virtual apparatus technology; simulating an input current signal by means of a mixed single-frequency signal generation method, and conducting frequency spectrum, step and pulse characteristic evaluation on the fiber current transformer model; merging the input current signal with a multi-harmonic current signal generated by the mixed single-frequency signal generation method, measuring the content of associated harmonic wave characteristics, and carrying out harmonic wave characteristic analysis on the fiber current transformer model; and merging a set transient current signal with the above mentioned input current signal, and achieving transient characteristic analysis on the fiber current transformer. The beneficial effects of the invention are that evaluation steps are easy, a good real-time effect and the high accuracy are exhibits, parameters of the established fiber current transformer mathematic model can be corrected and optimized conveniently, the test efficiency of the fiber current transformer can be improved, and technical support can be provided for performance evaluation of the fiber current transformer.
Description
Technical field
The present invention relates to electric power mutual-inductor assessment technology field, is a kind of optical fiber current mutual inductor model characteristics appraisal procedure based on virtual instrument technique.
Background technology
Electronic mutual inductor is a kind of important process layer devices in intelligent substation, for intelligent substation bay device provides electric current, information of voltage, realizes the functions such as relay protection of power system, electric energy metrical, failure wave-recording, status monitoring.Electronic current mutual inductor achieves real-time measurement and the monitoring of current signal, for the equipment such as relay protection of power system, electric energy metrical provides input signal.The characteristic of electronic current mutual inductor has important impact for the correct operation of relay protection of power system, when particularly electric system is broken down, in order to maintain the stable of electric system, and claimed quick acting and effectively.Along with going deep into of intelligent grid, extra-high voltage and Technology of HVDC based Voltage Source Converter, the characteristic of electronic current mutual inductor is had higher requirement.
The characteristic test assessment of prior art standard to conventional current mutual inductor has defined unified method, and less to the research of the correlation properties of optical fiber current mutual inductor.The steady-state characteristic of optical fiber current mutual inductor and transient response characteristic are the important performance indexes characterizing its reliability and environmental suitability, directly determine the range of application of optical fiber current mutual inductor.The method of evaluating characteristic of optical fiber current mutual inductor governs the raising of optical fiber current mutual inductor precision to a certain extent.Existing current transformer characteristic apparatus for evaluating mostly uses the testing equipments such as standard current transformer, current lifting device, pressure regulator, current loading case, mutual-inductor tester, the achievement data of current transformer is obtained by in-site measurement, usually the steady-state characteristic of current transformer is only conceived to, as the index such as angular difference, ratio, lack the evaluation work of other correlation properties, as transient characterisitics, response characteristic and harmonic characteristic.In actual transformer station, carry out the characteristic evaluation work of an optical fiber current mutual inductor, need to spend a large amount of energy and times, and in characteristic evaluation work, there is certain operations error and process the problems such as inaccurate, causing optical fiber current mutual inductor characteristic evaluation to there is the problem of the aspects such as accuracy is poor, test process is loaded down with trivial details, efficiency is low.
Summary of the invention
Technical matters to be solved by this invention is, a kind of optical fiber current mutual inductor model characteristics appraisal procedure based on virtual instrument technique is provided, the mathematical model of current transformer is set up by virtual instrument technique, and then carry out the characteristic evaluation work of current transformer, test process is simple, and efficiency is higher.
For solving the problems of the technologies described above, the invention provides a kind of optical fiber current mutual inductor model characteristics appraisal procedure based on virtual instrument technique, comprising the steps;
(1) virtual instrument technique is adopted to set up the mathematical model of optical fiber current mutual inductor, for a kind of closed loop control framework, light source sends interference light wave, the change of interference signal light intensity is detected through photodetector, through amplifying circuit, the photosignal detected is amplified, carry out analog to digital conversion by filtering circuit, send into signal processing unit, form closed-loop feedback voltage signal and carry out modulation electro-optic phase modulator, complete the equal-sized nonreciprocal feedback compensation phase shift of Faraday phase shift that phase-modulator causes with foreign current in fiber optic loop, signal processing unit obtains after compensation of phase and changes to obtain the current information of optical fiber current mutual inductor through scale factor, the model closed-loop control block diagram simplified represents the conversion coefficient between tested electric current and phase differential with K1, K2 represents and photoelectric conversion factors, AD conversion coefficient and digital demodulation semiperiod adopt the forward path gain of counting relevant, K3 represents analog output digital-to-analog conversion and driving circuit thereof, the links gains such as modulator are long-pending, the parameter of setting optical fiber current mutual inductor model, comprise the Verdet constant of optical fiber, strength of current, around the optical fiber number of turn of electrical lead, set up power function Derivation according to the mutual relationship of each proportional component in mathematical model and go out ssystem transfer function,
(2) the mixing simple signal method for generation analog input conventional current signal in virtual instrument technique is adopted, the optical fiber current mutual inductor mathematical model of signal through setting up, adopts the polymorphic system of selection of virtual instrument technique to complete the assessment of optical fiber current mutual inductor model amplitude-frequency, phase frequency, step response and pusle response characteristics respectively;
(3) the combined signal method of virtual instrument technique is adopted, the multiple harmonic current signal merging input current signal and adopt the mixing simple signal method for generation in virtual instrument to produce, the frequency spectrum analysis method of virtual instrument technique is adopted to obtain amplitude and the phase angle of output current signal, calculate standard amplitude, actual magnitude, angular difference, the ratio of output current signal, complete the harmonic characteristic assessment of optical fiber current mutual inductor model;
(4) transient current signal under various working is set, the combined signal method of virtual instrument technique is adopted to merge input current signal and transient current signal, signal is by optical fiber current mutual inductor model, the polymorphic system of selection of virtual instrument technique is adopted to export final current signal, adopt element to calculate the transient characterisitics content of mutual inductor with location operating structure method, realize the transient characterisitics assessment of optical fiber current mutual inductor model.
Preferably, virtual instrument technique is adopted to set up optical fiber current mutual inductor closed loop mathematical model in step (1), each proportional component of optical fiber current mutual inductor model can be simplified by programming, the mixing simple signal method for generation adopted in step (2) produces required current signal, the method process current signal of the combined signal adopted in step (3), the polymorphic system of selection adopted, frequency spectrum analysis method completes harmonic characteristic assessment, the combined signal method described in step (3) and element is adopted to complete transient characterisitics assessment with location operating structure method in step (4).
Beneficial effect of the present invention is: assessment is simple, efficiency is high, real-time good, accuracy is high; be convenient to revise and optimize the optical fiber current mutual inductor mathematical model parameters set up; the characteristic evaluation of optical fiber current mutual inductor model under different parameters can be completed; be conducive to the testing efficiency improving optical fiber current mutual inductor; for the technical feature assessment of optical fiber current mutual inductor provides technical support, finally for the application of electronic current mutual inductor in relay protection of power system, electric energy metrical, failure wave-recording, status monitoring etc. provides strong testing and verification.
Accompanying drawing explanation
Fig. 1 is optical fiber current mutual inductor characteristic evaluation schematic diagram of the present invention.
Fig. 2 is the signal flow graph of optical fiber current mutual inductor of the present invention.
Fig. 3 is the optical fiber current mutual inductor closed-loop control block diagram after the present invention simplifies.
Fig. 4 is the composition of input current signal of the present invention.
Fig. 5 is characteristic evaluation content resolution schematic diagram of the present invention.
Fig. 6 is optical fiber current mutual inductor method of evaluating characteristic process flow diagram of the present invention.
Embodiment
As shown in Figure 1, for optical fiber current mutual inductor method of evaluating characteristic schematic diagram, the mixing simple signal method for generation comprising employing virtual instrument technique produces input current signal, adopts virtual instrument technique to set up optical fiber current mutual inductor model, signals collecting and data processing, characteristic evaluation Four processes.
As shown in Figure 2, light source sends interference light wave, the change of interference signal light intensity is detected through photodetector, through amplifying circuit, the photosignal detected is amplified, then analog to digital conversion is carried out by filtering circuit, send into signal processing unit, form closed-loop feedback voltage signal and carry out modulation electro-optic phase modulator, complete the equal-sized nonreciprocal feedback compensation phase shift of Faraday phase shift that phase-modulator causes with foreign current in fiber optic loop, after signal processing unit obtains compensation of phase, be converted to the current information of optical fiber current mutual inductor through scale factor.
As shown in Figure 3, for the optical fiber current mutual inductor model closed-loop control block diagram after the present invention's simplification, the conversion coefficient between tested electric current and phase differential is represented respectively with K1, K2 represents and adopts the forward path gain of counting relevant with photoelectric conversion factors, AD conversion coefficient and digital demodulation semiperiod, K3 represent analog output digital-to-analog conversion and the gain of the links such as driving circuit, modulator long-pending.
As shown in Figure 4, be the composition of input current signal of the present invention, form primarily of conventional current signal, multiple harmonic current signal and transient current signal.Conventional current signal is used for the assessment of the frequency spectrum of optical fiber current mutual inductor model, step and pusle response characteristics, harmonic current signal is assessed for the harmonic characteristic of optical fiber current mutual inductor model, and transient current signal is assessed for the transient characterisitics of optical fiber current mutual inductor model.
As shown in Figure 5, be characteristic evaluation content resolution schematic diagram of the present invention, quantum evaluation is decomposed into spectral characteristic, step response characteristic, pusle response characteristics, harmonic characteristic, transient characterisitics.
(1) spectral characteristic, i.e. frequency characteristic and amplitude characteristic, measuring fiber the current transformer frequency values when-3dB frequency response bandwidth, this corresponding phase delay angle, amplitude and the situation of phase place in certain frequency range.
(2) step response characteristic, under signal excited by impact, the shock response speed of measuring fiber current transformer, total release time is worth, stationary performance situation.
(3) pusle response characteristics, under pulse excitation signal, measuring fiber current transformer step response speed, total rise time, vibration and over-control, stationary performance situation.
(4) harmonic characteristic, the information such as output current signal amplitude, frequency and the phase place of measuring fiber current transformer under multiple harmonic.
(5) transient characterisitics, mainly through calculating transient error electric current and peak-peak error, the ability of the resistance momentary current of reflection optical fiber current mutual inductor.
As shown in Figure 6, be the method for evaluating characteristic process flow diagram of optical fiber current mutual inductor model of the present invention, comprise the steps:
(1) virtual instrument technique is adopted to set up the mathematical model of optical fiber current mutual inductor, for a kind of closed loop control framework, light source sends interference light wave, the change of interference signal light intensity is detected through photodetector, through amplifying circuit, the photosignal detected is amplified, carry out analog to digital conversion by filtering circuit, send into signal processing unit, form closed-loop feedback voltage signal and carry out modulation electro-optic phase modulator, complete the equal-sized nonreciprocal feedback compensation phase shift of Faraday phase shift that phase-modulator causes with foreign current in fiber optic loop, signal processing unit obtains after compensation of phase and changes to obtain the current information of optical fiber current mutual inductor through scale factor, the model closed-loop control block diagram simplified represents the conversion coefficient between tested electric current and phase differential with K1, K2 represents and photoelectric conversion factors, AD conversion coefficient and digital demodulation semiperiod adopt the forward path gain of counting relevant, K3 represents analog output digital-to-analog conversion and driving circuit thereof, the links gains such as modulator are long-pending, the parameter of setting optical fiber current mutual inductor model, comprise the Verdet constant of optical fiber, strength of current, around the optical fiber number of turn of electrical lead, set up power function Derivation according to the mutual relationship of each proportional component in mathematical model and go out ssystem transfer function, (2) the mixing simple signal method for generation analog input conventional current signal in virtual instrument technique is adopted, the optical fiber current mutual inductor mathematical model of signal through setting up, adopts the polymorphic system of selection of virtual instrument technique to complete the assessment of optical fiber current mutual inductor amplitude-frequency, phase frequency, step response and pusle response characteristics respectively,
(3) the combined signal method of virtual instrument technique is adopted, the multiple harmonic current signal merging input current signal and adopt the mixing simple signal method for generation in virtual instrument to produce, the frequency spectrum analysis method of virtual instrument technique is adopted to obtain amplitude and the phase angle of output current signal, calculate standard amplitude, actual magnitude, angular difference, the ratio of output current signal, complete the harmonic characteristic assessment of optical fiber current mutual inductor model;
(4) transient current signal under various working is set, the combined signal method of virtual instrument technique is adopted to merge input current signal and transient current signal, signal is by optical fiber current mutual inductor model, the polymorphic system of selection of virtual instrument technique is adopted to export final current signal, adopt element to calculate the transient characterisitics content of mutual inductor with location operating structure method, realize the transient characterisitics assessment of optical fiber current mutual inductor model.
Although the present invention illustrates with regard to preferred implementation and describes, only it will be understood by those of skill in the art that otherwise exceed claim limited range of the present invention, variations and modifications can be carried out to the present invention.
Claims (2)
1., based on an optical fiber current mutual inductor model characteristics appraisal procedure for virtual instrument technique, it is characterized in that, comprise the steps:
(1) virtual instrument technique is adopted to set up the mathematical model of optical fiber current mutual inductor, for a kind of closed loop control framework, light source sends interference light wave, the change of interference signal light intensity is detected through photodetector, through amplifying circuit, the photosignal detected is amplified, analog to digital conversion is carried out by filtering circuit, send into signal processing unit, form closed-loop feedback voltage signal and carry out modulation electro-optic phase modulator, complete the equal-sized nonreciprocal feedback compensation phase shift of Faraday phase shift that phase-modulator causes with foreign current in fiber optic loop, signal processing unit obtains after compensation of phase and changes to obtain the current information of optical fiber current mutual inductor through scale factor, the model simplified represents the conversion coefficient between tested electric current and phase differential with K1, K2 represents and photoelectric conversion factors, AD conversion coefficient and digital demodulation semiperiod adopt the forward path gain of counting relevant, K3 represents analog output digital-to-analog conversion and driving circuit thereof, the links gains such as modulator are long-pending, the parameter of setting optical fiber current mutual inductor model, comprise the Verdet constant of optical fiber, strength of current, around the optical fiber number of turn of electrical lead, set up power function Derivation according to the mutual relationship of each proportional component in mathematical model and go out ssystem transfer function,
(2) the mixing simple signal method for generation analog input conventional current signal of virtual instrument technique is adopted, the optical fiber current mutual inductor mathematical model of signal through setting up, the polymorphic system of selection of employing virtual instrument technique completes the assessment of the amplitude-frequency of optical fiber electricity current transformer model, phase frequency, step response and pusle response characteristics respectively;
(3) the combined signal method of virtual instrument technique is adopted, the multiple harmonic current signal merging input current signal and adopt the mixing simple signal method for generation in virtual instrument to produce, the frequency spectrum analysis method of virtual instrument technique is adopted to obtain amplitude and the phase angle of output current signal, calculate standard amplitude, actual magnitude, angular difference, the ratio of output current signal, complete the harmonic characteristic assessment of optical fiber current mutual inductor model;
(4) transient current signal under various working is set, the combined signal method of virtual instrument technique is adopted to merge input current signal and transient current signal, signal is by optical fiber current mutual inductor model, the polymorphic system of selection of virtual imitative technical device is adopted to export final current signal, adopt element to calculate the transient characterisitics content of mutual inductor with location operating structure method, realize the transient characterisitics assessment of optical fiber current mutual inductor model.
2. as claimed in claim 1 based on the optical fiber current mutual inductor model characteristics appraisal procedure of virtual instrument technique, it is characterized in that, virtual instrument technique is adopted to set up optical fiber current mutual inductor closed loop mathematical model in step (1), each proportional component of optical fiber current mutual inductor model can be simplified by programming, the mixing simple signal method for generation adopted in step (2) produces required current signal, the method process current signal of the combined signal adopted in step (3), the polymorphic system of selection adopted, frequency spectrum analysis method completes harmonic characteristic assessment, the combined signal method described in step (3) and element is adopted to complete transient characterisitics assessment with location operating structure method in step (4).
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Cited By (10)
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| CN105548942A (en) * | 2016-01-18 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | System and method for analyzing transient characteristics of electronic current transformer |
| CN106324545A (en) * | 2016-10-14 | 2017-01-11 | 哈尔滨理工大学 | Fiber and grating current transformer with nonlinear correction treatment function |
| CN106772199A (en) * | 2017-01-05 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of DC current transformer frequency response characteristic check system and method |
| CN108445289A (en) * | 2018-03-09 | 2018-08-24 | 北京四方继保自动化股份有限公司 | A kind of high voltage direct current optical harmonic measuring device |
| CN109490813A (en) * | 2018-12-06 | 2019-03-19 | 国网四川省电力公司电力科学研究院 | A kind of current transformer characteristic appraisal procedure and system |
| CN110045308A (en) * | 2018-01-16 | 2019-07-23 | 中国电力科学研究院有限公司 | All -fiber direct current measuring devices step response test macro and method |
| CN111123186A (en) * | 2019-12-20 | 2020-05-08 | 中国电力科学研究院有限公司 | Device and method for testing broadband characteristics of optical fiber current sensor |
| CN112731257A (en) * | 2021-01-12 | 2021-04-30 | 中国电力科学研究院有限公司 | Step response simulation method and system of all-fiber current transformer |
| CN113625216A (en) * | 2021-10-12 | 2021-11-09 | 国网江西省电力有限公司电力科学研究院 | Direct current transformer flying spot closed loop testing device and method |
| CN113720321A (en) * | 2021-11-02 | 2021-11-30 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Temperature compensation system of fiber-optic gyroscope |
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| CN105548942A (en) * | 2016-01-18 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | System and method for analyzing transient characteristics of electronic current transformer |
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| CN106772199A (en) * | 2017-01-05 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of DC current transformer frequency response characteristic check system and method |
| CN110045308A (en) * | 2018-01-16 | 2019-07-23 | 中国电力科学研究院有限公司 | All -fiber direct current measuring devices step response test macro and method |
| CN108445289A (en) * | 2018-03-09 | 2018-08-24 | 北京四方继保自动化股份有限公司 | A kind of high voltage direct current optical harmonic measuring device |
| CN109490813A (en) * | 2018-12-06 | 2019-03-19 | 国网四川省电力公司电力科学研究院 | A kind of current transformer characteristic appraisal procedure and system |
| CN111123186A (en) * | 2019-12-20 | 2020-05-08 | 中国电力科学研究院有限公司 | Device and method for testing broadband characteristics of optical fiber current sensor |
| CN111123186B (en) * | 2019-12-20 | 2023-05-09 | 中国电力科学研究院有限公司 | Device and method for testing broadband characteristics of optical fiber current sensor |
| CN112731257A (en) * | 2021-01-12 | 2021-04-30 | 中国电力科学研究院有限公司 | Step response simulation method and system of all-fiber current transformer |
| CN113625216A (en) * | 2021-10-12 | 2021-11-09 | 国网江西省电力有限公司电力科学研究院 | Direct current transformer flying spot closed loop testing device and method |
| CN113720321A (en) * | 2021-11-02 | 2021-11-30 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Temperature compensation system of fiber-optic gyroscope |
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