CN104267230B - A kind of signal reduction method of passive electronic type voltage transformer - Google Patents

A kind of signal reduction method of passive electronic type voltage transformer Download PDF

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Publication number
CN104267230B
CN104267230B CN201410551162.4A CN201410551162A CN104267230B CN 104267230 B CN104267230 B CN 104267230B CN 201410551162 A CN201410551162 A CN 201410551162A CN 104267230 B CN104267230 B CN 104267230B
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China
Prior art keywords
signal
component
electronic type
voltage transformer
passive electronic
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CN201410551162.4A
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Chinese (zh)
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CN104267230A (en
Inventor
冯宇
吴士普
廖志军
汪本进
王玲
靳邵平
邱进
徐思恩
杜砚
陈晓明
李璿
乔建光
许文龙
费烨
毛安澜
周翠娟
Original Assignee
国家电网公司
中国电力科学研究院
国网江西省电力公司
江苏西电南自智能电力设备有限公司
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Abstract

The present invention provides a kind of signal reduction method of passive electronic type voltage transformer, and methods described comprises the following steps:Step S1, filter out the DC signal component in the fibre optical sensor output signal of the passive electronic type voltage transformer;Step S2, the AC signal component in the output signal is AD converted;Step S3, digital integration is carried out to the data signal after AD conversion.This method had both improved the signals revivification precision of passive electronic type voltage transformer, while also improved its transient response and transient recovery ability, effectively improved the combination property of passive electronic type voltage transformer.

Description

A kind of signal reduction method of passive electronic type voltage transformer

Technical field:

It is in particular to a kind of for passive electronic type voltage transformer the present invention relates to a kind of signal reduction method Signal reduction method.

Background technology:

With the continuous propulsion of intelligent grid construction, its Related Supporting Technologies obtains tremendous development.To measure, controlling The electric power mutual-inductor of metrical information is provided as a kind of important transformer, its enormous amount with electrical secondary systems such as relay protections It is and widely distributed.

With traditional type electric power mutual-inductor ratio, the electronic mutual inductor in electric power mutual-inductor, have insulation system it is simple, without magnetic The advantages that saturation, transient response scope are big, the digitlization of small volume, output signal, is widely applied in power network in recent years.

Because passive electronic type voltage transformer employs fibre optical sensor, thus make it have transient characterisitics it is good, The features such as precision is high, Electro Magnetic Compatibility is excellent.To obtain primary voltage measurement signal, due to part passive electronic type voltage The current signal that the fibre optical sensor of transformer detects is differential signal, so being also needed in follow-up link by integrating it Reduction.

Integration method currently used for realizing differential signal reduction mainly has hardware integration, Software Integration and hardware integration to add Software eliminates three kinds of drift.

Hardware integration method can introduce very big error because of the discreteness of device to integral result, and because presence is very big Proportionality coefficient, be readily incorporated additional dc component, so can be impacted to the performance of system.

Software Integration method can export larger DC component and even result in integral process not because continuous number integrates Convergence, eventually deteriorate transient response and the transient recovery ability of passive electronic type voltage transformer.

The method that hardware integration plus software eliminate drift is that current passive electronic type voltage transformer manufacturer generally uses Method, though this method is easily achieved, integral accuracy susceptible and the transient response to signal and transient recovery ability Influence it is also larger, in addition, this method eliminates passive electronic type voltage mutual inductance by the way of back-end software algorithm compensation DC component in the data collecting system of device, the real-time for eliminating DC component are poor.

To sum up, in the data collecting system of passive electronic type voltage transformer, the conventional method of differential signal is reduced The influence of the DC component in data collecting system can not be effectively eliminated, so as to reduce the measurement accuracy of equipment, deteriorate nothing The transient response ability of source type electronic type voltage transformer.

The content of the invention:

In order to overcome the above-mentioned deficiency in the presence of prior art, the present invention provides one kind and is used for passive electronic type voltage The signal reduction method of transformer.

Technical scheme provided by the invention is:A kind of signal reduction method of passive electronic type voltage transformer, it changes Enter part to be:

Methods described comprises the following steps:

Step S1, filter out the direct current signal in the fibre optical sensor output signal of the passive electronic type voltage transformer Component;

Step S2, the AC signal component in the output signal is AD converted;

Step S3, digital integration is carried out to the data signal after AD conversion.

Preferably, the fibre optical sensor output signal is mixed into the pure differential signal by pure differential signal and the external world DC signal component superposition composition, the pure differential signal by DC signal component and AC signal component superposition form.

Preferably, the step S1 includes:

1) signal condition is carried out to the fibre optical sensor output signal with signal conditioning circuit, and by the signal after conditioning Export to second-order low-pass filter;

2) second-order low-pass filter filters out the AC signal component in the signal received, and the direct current of reservation is believed Number component export the DC signal component that is carried to anti-phase proportional amplifier, the DC signal component by pure differential signal and The external world is mixed into the DC signal component superposition composition in the pure differential signal;

3) DC signal component received is converted into and the DC signal component pole by the anti-phase proportional amplifier The opposite direct current signal of property, and will be anti-phase after DC signal output to isolated amplifier;

4) isolated amplifier is exported to sample resistance after being amplified to the DC signal component received;

5) sample resistance collection receives the DC signal component and by the DC signal component with it is described Fibre optical sensor output signal is superimposed, and filters out the DC signal component in the fibre optical sensor output signal;

6) the fibre optical sensor output signal after DC component is filtered out to export through signal conditioning circuit.

Preferably, the step S2 includes:AD samplers reception signal nurses one's health the analog AC signal of circuit output, and will Analog AC signal, which is converted into after Digital AC signal x (i) to export, gives digital integration module, and wherein i is the sampling of AD samplers The calculation times of number, i.e. digital integration module;X (i) is the digital signal value of ith AD samplers samples, i.e. ith numeral The input value of integration module.

Preferably, the step S3 includes:Digital integration module enters line number by the way of the cumulative summation of equation below (1) The data signal y (i) being reduced is exported after word integration, the calculating cycle of the digital integration module is equal to the AD samplers Sampling period;

Y (i)=y (i-1)+x (i)-α * z1, y (0)=0 (1)

In formula (1):Y (i-1) is the output valve of the i-th -1 time digital integration module;Y (i) is ith digital integration module Output valve;z1For DC component after integration;α is attenuation coefficient, and α is the actual feelings according to voltage class of electric power system or capacity Empirical parameter depending on condition:

α=1/ (t*fs) 0.5<T < 2; (2)

In formula:T is the time, and t unit is the second;fsFor sample frequency.

Compared with immediate technical scheme, the present invention has the advantages that:

Technical scheme provided by the invention had both overcome prior art integral accuracy susceptible and the transient state to signal is rung Should and transient recovery ability influence it is also larger the defects of, also overcome by the way of back-end software algorithm compensation to eliminate nothing The poor deficiency of the real-time of DC component in the data collecting system of source type electronic type voltage transformer.

Technical scheme restores passive due to filtering out DC component and digital integration is combined using hardware The output signal of electronic type voltage transformer, the signals revivification precision of passive electronic type voltage transformer is improved, also simultaneously Transient response and the transient recovery ability of passive electronic type voltage transformer are improved, effectively improves passive electronic type electricity Press the combination property of transformer.

Brief description of the drawings:

Fig. 1 is the theory diagram of the present invention;

Fig. 2 is the control block diagram that DC component part is filtered out in Fig. 1;

Fig. 3 is that elimination process is shaken in the fibre optical sensor output signal forward direction drift of passive electronic type voltage transformer;

Fig. 4 is that elimination process is shaken in the fibre optical sensor output signal negative sense drift of passive electronic type voltage transformer.

Embodiment:

For a better understanding of the present invention, present disclosure is described further with reference to Figure of description.

The fibre optical sensor output voltage signal of passive electronic type voltage transformer is by pure differential signal and extraneous mixing Composition is superimposed to the DC signal component in pure differential signal, wherein pure differential signal is by DC signal component and AC signal point Amount superposition composition;That is fibre optical sensor output voltage signal is made up of AC signal component and DC signal component, wherein direct current The DC signal component and the extraneous DC signal component being mixed into pure differential signal that component of signal is carried by pure differential signal Superposition composition, the AC signal component that AC signal component is carried by pure differential signal form.

As shown in Figure 1:In the fibre optical sensor output voltage signal for filtering out passive electronic type voltage transformer first DC signal component, retain AC signal component;Then AC signal component is AD converted, analog AC signal is changed For corresponding Digital AC signal, and Digital AC signal is transferred to digital integration module, digital integration module is handed over numeral Stream signal exports the signal being reduced after carrying out digital integration.

The control block diagram for filtering out DC component part in Fig. 1 is as shown in Figure 2:

1) letter is carried out to the fibre optical sensor output signal of passive electronic type voltage transformer using signal conditioning circuit Number conditioning, the size of output signal is met the input of second-order low-pass filter and AD samplers, then by the signal after conditioning Export to second-order low-pass filter;

2) second-order low-pass filter filters out the AC signal component in the signal received, and the direct current signal of reservation is divided Amount output is to anti-phase proportional amplifier;

3) DC signal component received is converted into opposite polarity with DC signal component by anti-phase proportional amplifier Direct current signal (if system contains the negative DC voltage value of positive DC component, output, if system contain negative DC component, if Export positive DC voltage value.), and will be anti-phase after DC signal output to isolated amplifier;

4) isolated amplifier is amplified to the DC signal component after anti-phase, by the straight of anti-phase scaling loop output Flow component signal is converted into corresponding DC voltage value, is then output to sample resistance;

5) the sample resistance direct current signal that receives of the collection and direct current signal passive electronic type voltage that is added to is mutual In the fibre optical sensor output signal of sensor, so as to filter out the DC signal component in fibre optical sensor output signal;

6) filter out the conditioned circuit output of fibre optical sensor output signal after DC component and carry out AD turns to AD samplers Change.

Wherein, the process for filtering out DC component be not it is instantaneous, but one concussion attenuation process.

As shown in Figure 3:The fibre optical sensor output signal forward direction drift of passive electronic type voltage transformer is (namely defeated Go out and contain positive DC component in signal) concussion eliminate process be:When system drift contains positive DC component, filter out straight The superposed signal of flow component is negative DC component, and negative direct current component value is more than fibre optical sensor output letter when being superimposed for the first time Number DC component, the drift of fibre optical sensor output signal can become negative value, negative sense overshoot process occur, but with continuing to fold After adding forward dc component, overshoot signal can return to positive axis, after being repeated several times, the zero of fibre optical sensor output signal It is 0 that drift, which can shake abatement,.

As shown in Figure 4:The fibre optical sensor output signal negative sense drift of passive electronic type voltage transformer is (namely defeated Go out in signal containing negative DC component) concussion eliminate process and be:When system drift contains negative DC component, filter out straight The superposed signal of flow component is positive DC component, and positive direct current component value is more than fibre optical sensor output letter when being superimposed for the first time Number DC component, the drift of fibre optical sensor output signal can become on the occasion of there is positive overshoot process, but with continuing to fold After adding negative sense DC component, overshoot signal can return to negative semiaxis, after being repeated several times, the zero of fibre optical sensor output signal It is 0 that drift, which can shake abatement,.

DC component filters out module and eliminates DC component in fibre optical sensor output signal, improves data acquisition system The transient response of system and transient recovery ability.

Digital integration module is carried out by the way of cumulative summation, shown in its integral formula such as formula (1):

Y (i)=y (i-1)+x (i)-α * z1 (1)

Y (0)=0;

Wherein:The calculation times of i-digital integration module, the input value of x (i)-ith digital integration module;

The output valve of y (i)-ith digital integration module, y (i-1)-the i-th -1 time digital integration mould

The output valve of block;

z1--- DC component after integration;

α --- attenuation coefficient;

Wherein, the calculating cycle of digital integration module is equal with the sampling period of AD samplers, z in calculating process1Value Essentially 0;α is then the empirical parameter depending on the actual conditions of voltage class of electric power system or capacity, as shown in formula (2):

α=1/ (t*fs) 0.5<T < 2 (2)

Wherein, t is the time, and t unit is the second, fsFor sample frequency.

Embodiments of the invention are these are only, are not intended to limit the invention, it is all in the spirit and principles in the present invention Within, any modification, equivalent substitution and improvements done etc., applying within pending scope of the presently claimed invention.

Claims (2)

  1. A kind of 1. signal reduction method of passive electronic type voltage transformer, it is characterised in that:
    Methods described comprises the following steps:
    Step S1, filter out the direct current signal point in the fibre optical sensor output signal of the passive electronic type voltage transformer Amount;
    Step S2, the AC signal component in the output signal is AD converted;
    The step S2 includes:AD samplers reception signal nurses one's health the analog AC signal of circuit output, and analog AC is believed Number it is converted into after Digital AC signal x (i) to export and gives digital integration module, wherein i is the sampling number of AD samplers, i.e. numeral The calculation times of integration module;X (i) is the digital signal value of ith AD samplers samples, i.e. ith digital integration module Input value;
    Step S3, digital integration is carried out to the data signal after AD conversion;
    The step S1 includes:
    1) signal condition is carried out to the fibre optical sensor output signal with signal conditioning circuit, and by the signal output after conditioning To second-order low-pass filter;
    2) second-order low-pass filter filters out the AC signal component in the signal received, and the direct current signal of reservation is divided The DC signal component and the external world that amount output is carried to anti-phase proportional amplifier, the DC signal component by pure differential signal The DC signal component superposition composition being mixed into the pure differential signal;
    3) DC signal component received is converted into and the DC signal component polarity phase by the anti-phase proportional amplifier Anti- direct current signal, and will be anti-phase after DC signal output to isolated amplifier;
    4) isolated amplifier is exported to sample resistance after being amplified to the DC signal component received;
    5) sample resistance collection receives the DC signal component and by the DC signal component and the optical fiber Sensor output signal is superimposed, and filters out the DC signal component in the fibre optical sensor output signal;
    6) the fibre optical sensor output signal after DC component is filtered out to export through signal conditioning circuit;
    The step S3 includes:Digital integration module is defeated after digital integration is carried out by the way of equation below (1) adds up summation Go out the data signal y (i) being reduced, the calculating cycle of the digital integration module is equal to the sampling period of the AD samplers;
    Y (i)=y (i-1)+x (i)-α * z1, y (0)=0 (1)
    In formula (1):Y (i-1) is the output valve of the i-th -1 time digital integration module;Y (i) is the defeated of ith digital integration module Go out value;z1For DC component after integration;α is attenuation coefficient, α be the actual conditions according to voltage class of electric power system or capacity and Fixed empirical parameter:
    α=1/ (t*fs) 0.5<T < 2; (2)
    In formula:T is the time, and t unit is the second;fsFor sample frequency.
  2. A kind of 2. signal reduction method of passive electronic type voltage transformer as claimed in claim 1, it is characterised in that:
    The fibre optical sensor output signal is by pure differential signal and the extraneous direct current signal being mixed into the pure differential signal Component superposition composition, the pure differential signal are made up of DC signal component and AC signal component superposition.
CN201410551162.4A 2014-10-17 2014-10-17 A kind of signal reduction method of passive electronic type voltage transformer CN104267230B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101320501A (en) * 2008-07-17 2008-12-10 北京航空航天大学 Method and apparatus for implementing optical fiber perimeter alarm
CN101770861A (en) * 2010-01-19 2010-07-07 深圳市科陆电子科技股份有限公司 Protective electronic transformer
CN102790596A (en) * 2011-05-20 2012-11-21 杭州中科微电子有限公司 Automatic gain control amplifier for canceling direct current offset
CN202648677U (en) * 2012-03-29 2013-01-02 扬州永阳光电科贸有限公司 Reflecting interference type optical fiber sensor system
CN103941069A (en) * 2013-12-30 2014-07-23 上海大郡动力控制技术有限公司 Method for removing DC bias voltage in AC current sampling process

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103095233B (en) * 2013-01-23 2015-10-28 电子科技大学 The amplifier of cancellation of DC offset

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101320501A (en) * 2008-07-17 2008-12-10 北京航空航天大学 Method and apparatus for implementing optical fiber perimeter alarm
CN101770861A (en) * 2010-01-19 2010-07-07 深圳市科陆电子科技股份有限公司 Protective electronic transformer
CN102790596A (en) * 2011-05-20 2012-11-21 杭州中科微电子有限公司 Automatic gain control amplifier for canceling direct current offset
CN202648677U (en) * 2012-03-29 2013-01-02 扬州永阳光电科贸有限公司 Reflecting interference type optical fiber sensor system
CN103941069A (en) * 2013-12-30 2014-07-23 上海大郡动力控制技术有限公司 Method for removing DC bias voltage in AC current sampling process

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