CN113067603A - Power line noise suppression method for HPLC - Google Patents
Power line noise suppression method for HPLC Download PDFInfo
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- CN113067603A CN113067603A CN202110316486.XA CN202110316486A CN113067603A CN 113067603 A CN113067603 A CN 113067603A CN 202110316486 A CN202110316486 A CN 202110316486A CN 113067603 A CN113067603 A CN 113067603A
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- H—ELECTRICITY
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
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Abstract
The invention discloses a power line noise suppression method for HPLC, relating to the technical field of power communication; the method comprises the steps of extracting a pre-noise N '(N) from a power line according to a preset pre-time based on an adaptive power line noise suppressor, carrying out adaptive noise suppression on a power line signal d (N) through the pre-noise N' (N) and obtaining a noise reduction signal e (N), wherein the adaptive power line noise suppressor comprises an adaptive filter and a subtracter which are electrically connected with each other; the power line noise suppression method extracts the pre-noise N' (N) through the self-adaptive power line noise suppressor to perform self-adaptive noise suppression on the power line signal d (N) and obtain a noise reduction signal e (N) and the like, so that the power line noise suppression method is high in working efficiency and good in effect.
Description
Technical Field
The invention relates to the technical field of power communication, in particular to a power line noise suppression method for High Performance Liquid Chromatography (HPLC).
Background
High-voltage Power Line Communication (HPLC) is a novel Power Line Communication technology. At present, the HPLC technology is widely applied to the field of domestic electricity consumption information acquisition. Compared with the low-speed narrow-band power line carrier communication within the frequency band range of 3-500kHz, the HPLC works in the frequency band of 0.7-12MHz, the noise amplitude is low and relatively stable, and the channel quality is good; the Orthogonal Frequency Division Multiplexing (OFDM) technology is adopted, so that the frequency band utilization rate is high, and the anti-interference capability is strong.
According to the Q/GDW 11612 standard, 4 frequency bands can be selected for HPLC, which are respectively 1.953-11.96MHz, 2.441-5.615MHz, 0.781-2.930MHz and 1.758-2.930 MHz. In practice, the influence of electromagnetic radiation caused by HPLC on the environment is considered, the high frequency band is used less, and the most common communication frequency band is 0.781-2.930 MHz.
The conventional power line impulse noise suppression methods are noise estimation and elimination, blanking/clipping (blanking) methods, and these noise suppression methods depending on noise characteristic parameters are not ideal in time-varying power channel environments. Another non-parametric denoising method mainly utilizes the sparsity of impulse noise in a time domain, an impulse noise suppression method based on compressed sensing is proposed in the prior art, an interleaving technology based on multi-signal classification is proposed in the prior art to achieve impulse noise suppression, and an LS algorithm is used for estimating the amplitude of the impulse noise in a frequency domain. The prior art provides an impulse noise detection method based on a multilayer perceptron network, and an iterative receiver is utilized to improve the error code performance. The nonparametric method is generally combined with the modulation and coding technology of the OFDM system, and the implementation is complex and involves the overall scheme design of the receiver.
The special internet is used inside the power supply department.
The main disadvantages of the prior art solutions are: the characteristic analysis and modeling of the noise to be suppressed are needed, and the effect is often poor and the realization is difficult for the complex noise of the actual field.
Problems with the prior art and considerations:
how to solve the technical problems of lower working efficiency and poorer effect of power line noise suppression.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a power line noise suppression method for HPLC, which extracts a pre-noise N '(N) from a power line according to a preset pre-set time through an adaptive power line noise suppressor, performs adaptive noise suppression on a power line signal d (N) through the pre-noise N' (N) and obtains a noise reduction signal e (N) and the like, thereby realizing high power line noise suppression working efficiency and good effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a power line noise suppression method for HPLC is based on an adaptive power line noise suppressor, a preposed noise N '(N) is extracted from a power line according to a preset preposed time, and a power line signal d (N) is subjected to adaptive noise suppression through the preposed noise N' (N) to obtain a noise reduction signal e (N), wherein the adaptive power line noise suppressor comprises an adaptive filter and a subtracter which are electrically connected with each other.
The further technical scheme is as follows: the subtractor comprises two input ends and an output end, the two input ends of the subtractor are respectively a first input end and a second input end, the output end of the adaptive filter is electrically connected with the second input end of the subtractor, the output end of the subtractor is electrically connected with the control end of the adaptive filter, and the adaptive filter and the subtractor which are electrically connected with each other form an adaptive power line noise suppressor.
The further technical scheme is as follows: the method specifically comprises the following steps:
s1 collecting power line signal
Obtaining a digitalized power line signal d (n) from a power line and inputting the digitalized power line signal d (n) to a first input end of the subtracter;
s2 obtaining pre-noise
Acquiring a pre-noise N '(N) from a power line according to a preset pre-time and inputting the pre-noise N' (N) to an input end of an adaptive filter;
s3 noise elimination
The adaptive power line noise suppressor performs subtraction calculation by using the input power line signal d (n) and the output y (n) of the adaptive filter to obtain and output a noise reduction signal e (n).
The further technical scheme is as follows: in step S1, the strong electricity is isolated by the coupler and converted by the analog-to-digital converter to obtain a digitized power line signal d (n).
The further technical scheme is as follows: in the step of S1, the power line signal d (n) includes a communication signal x (n) of the power line and noise n (n).
The further technical scheme is as follows: the lead time is 20 ms.
The further technical scheme is as follows: the noise reduction circuit also comprises a first HPLC chip used for demodulating the noise reduction signal e (n), and the output end of the subtracter is electrically connected and communicated with the first HPLC chip.
The further technical scheme is as follows: also included is a concentrator, the first HPLC chip being in electrical connection and communication with the concentrator.
The further technical scheme is as follows: the concentrator is connected to the private internet through the wireless communication device, the server is connected to the private internet through the wireless communication device, and the concentrator is connected and communicates with the server through the wireless communication device and the private internet.
The further technical scheme is as follows: also included is an electric meter, the first HPLC chip being electrically connected and in communication with the electric meter.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
a power line noise suppression method for HPLC is based on an adaptive power line noise suppressor, a preposed noise N '(N) is extracted from a power line according to a preset preposed time, and a power line signal d (N) is subjected to adaptive noise suppression through the preposed noise N' (N) to obtain a noise reduction signal e (N), wherein the adaptive power line noise suppressor comprises an adaptive filter and a subtracter which are electrically connected with each other. The power line noise suppression method extracts the pre-noise N' (N) through the self-adaptive power line noise suppressor to perform self-adaptive noise suppression on the power line signal d (N) and obtain a noise reduction signal e (N) and the like, so that the power line noise suppression method is high in working efficiency and good in effect.
See detailed description of the preferred embodiments.
Drawings
FIG. 1 is a functional block diagram of an adaptive power line noise suppressor according to the present invention;
FIG. 2 is a time domain and short time Fourier transform amplitude spectrum of power line noise in the present invention;
FIG. 3 is a graph of normalized correlation coefficients of noise in the 5-5.1ms and 25-25.1ms periods of the present invention;
FIG. 4 is a time domain waveform diagram of LMS adaptive filtering in the present invention;
fig. 5 is a graph comparing bit error rates in the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
The invention discloses a power line noise suppression method facing HPLC (high performance liquid chromatography), which is based on an adaptive power line noise suppressor, extracts pre-noise N '(N) from a power line according to preset pre-set time, performs adaptive noise suppression on a power line signal d (N) through the pre-noise N' (N) and obtains a noise reduction signal e (N), and specifically comprises the following steps:
as shown in fig. 1, the hardware portion includes an adaptive filter and a subtractor, the subtractor includes two input terminals and an output terminal, the two input terminals of the subtractor are respectively a first input terminal and a second input terminal, the output terminal of the adaptive filter is electrically connected to the second input terminal of the subtractor, the output terminal of the subtractor is electrically connected to the control terminal of the adaptive filter, and the adaptive filter and the subtractor, which are electrically connected to each other, form an adaptive power line noise suppressor.
The method comprises the following steps:
s1 collecting power line signal
Strong electricity is isolated by a coupler, and a digitalized power line signal d (n) and a communication signal x (n) of a power line and noise N (n) are obtained and input to a first input end of the subtracter after being converted by an analog-to-digital converter.
S2 obtaining pre-noise
And acquiring the pre-noise N' (N) on a power line according to a preset pre-time, wherein the pre-time is 20ms, and inputting the pre-noise into an input end of the adaptive filter.
S3 noise elimination
The adaptive power line noise suppressor performs subtraction calculation by using the input power line signal d (n) and the output y (n) of the adaptive filter to obtain and output a noise reduction signal e (n).
The adaptive filter and the subtractor themselves and the corresponding communication connection technology are not described in detail herein for the prior art.
The conception of the application is as follows:
based on the self-adaptive filtering principle, the method realizes the suppression of the power line noise, reduces the communication error rate and improves the communication reliability by utilizing the characteristic that the power line noise with the interval of 20ms has correlation.
The application provides a method for suppressing noise by utilizing the power line noise circulation stability characteristic of an HPLC frequency band, so that the reliability and the speed of HPLC are improved.
The method provided by the application does not need to model the noise characteristic in advance, and is simple to implement. The noise suppression not only aims at impulse noise, has better adaptability, does not need to be combined with a specific communication modulation coding scheme, and has application independence.
The purpose of the application is:
the self-adaptive noise suppression is carried out by utilizing the correlation of noise with an interval of 20ms, is insensitive to the statistical characteristic of the noise, can exist as an independent module of a communication system, and has strong adaptability.
The technical scheme of the application is as follows:
as shown in fig. 2, the time domain waveform of a power line noise and the amplitude spectrum obtained by short-time fourier transform are shown.
The noise shows a certain cyclostationarity, and has strong correlation at intervals of 20ms from the short-time Fourier transform result. The peak of the noise can reach several V. The impulse noise is composed of oscillation waveforms of a plurality of periods, and the frequency domain distribution of the impulse noise can cover the whole HPLC communication frequency band, so that adverse influence is caused on HPLC communication.
As shown in fig. 3, the normalized correlation coefficients of the two noise segments of 5-5.1ms and 25-25.1ms are shown, i.e. the interval between the two noise segments is still 20ms, and the duration of each noise segment is 0.1 ms. It can be seen from the figure that the maximum value of 0.86 occurs at a relative delay of 0.0125 ms, and the correlation is very significant. Correlation coefficient calculations at other time periods indicate that such strong correlation is ubiquitous, which also provides an important basis for the application of the adaptive noise suppression method.
As shown in fig. 1, in order to implement a power line noise suppression method based on the adaptive filtering principle, a reference signal d (N) is a superposition of power line noise N (N) and a useful communication signal x (N), and N '(N) is another noise having a correlation with N (N), specifically, N' (N) is a noise that appears 20ms earlier in time than N (N). The noise and the signal are independent from each other, and the self-adaptive filter adjusts the parameters thereof by utilizing the correlation of the noise, so that y (n) becomes the best estimation of N (n), and e (n) approaches to x (n), thereby realizing the suppression of the noise and the extraction of the signal.
The adaptive filtering algorithm may be based on existing techniques such as the Least Mean Square (LMS) algorithm, the normalized LMS (nlms) algorithm, the Recursive Least Squares (RLS) algorithm, and the like. The iteration process of the LMS algorithm mainly comprises the steps of filtering, error calculation and filter coefficient updating:
y(n)＝ωT(n)N'(n) (1)
e(n)＝d(n)-y(n) (2)
ω(n+1)＝ω(n)+2μ·e(n)N'(n) (3)
where ω is the tap coefficient vector of the filter, the number of elements is the filter length, and μ is the step size.
The normalized lms (nlms) algorithm performs adaptive filtering. The filter coefficient update formula is
Here,. mu.1Ψ is the detuning parameter for the step size.
As shown in fig. 4, the waveforms of the noise-added signal d (n) and the filtered output e (n) are shown. The amplitude of the adaptively filtered noise waveform becomes significantly smaller.
In order to further verify the improvement effect of the adaptive noise suppression method on the communication error rate, under the condition of a sampling rate of 20MS/s, an OFDM signal is constructed based on 512-point FFT, BPSK modulation is adopted for subcarriers, 18 th to 76 th subcarriers are used for transmitting data, and the corresponding frequency band is 0.7-3 MHz.
As shown in fig. 5, the bit error rate is compared for different signal-to-noise ratios. Therefore, compared with the error rate without adaptive filtering, the adaptive noise suppression method based on the NLMS algorithm can obviously reduce the error rate.
Description of the technical solution:
1. the signals of the power lines are collected in real time (strong electricity is isolated through a coupler and is converted into digital signals through an analog-to-digital converter, and the digital signals representing the voltage are focused and processed in the application). When no communication signal exists, the noise of the power line is collected; in the presence of a communication signal, signal plus noise is collected.
2. Storing the noise data in real time as adaptive noise suppressed N' (N); when a communication signal arrives, the communication signal is input into an adaptive power line noise suppressor as d (N) together with a noise signal N' (N) before 20ms (the whole block diagram is called that the adaptive power line noise suppressor comprises an adaptive filter and a subtracter).
3. The adaptive power line noise suppressor uses real-time input d (N) and stored N' (N) to perform repeated iterative calculation continuously, and simultaneously outputs e (N) in real time, wherein e (N) is an approximation of the useful communication signal x (N) in d (N) according to the adaptive filtering principle, so that the noise N (N) is eliminated in d (N).
4. The adaptive filter requires that N' (N) and N (N) have a certain correlation, and fig. 2 is a time domain representation of the correlation, i.e. exhibits a cyclostationary characteristic at intervals of 20 ms; fig. 3 is a specific calculation of this correlation, and the two figures are for the purpose of illustrating the feasibility of the adaptive noise suppression method, and not the method itself.
5. There are many specific adaptive algorithms, and the present application describes two algorithms, namely a Least Mean Square (LMS) algorithm and a normalized LMS (nlms) algorithm, and what is desired to be protected is not limited to a specific algorithm, but rather to the idea. Different algorithms relate to different parameters and selection methods of optimal parameters, and the part is the prior art, and the details are not repeated in the application.
6. Specific several iterative formulas are as follows:
y(n)＝ωT(n)N'(n) (1)
e(n)＝d(n)-y(n) (2)
ω(n+1)＝ω(n)+2μ·e(n)N'(n) (3)
where ω is the tap coefficient vector of the filter, the number of elements is the filter length, and μ is the step size.
The normalized lms (nlms) algorithm performs adaptive filtering. The filter coefficient update formula is
Here,. mu.1Ψ is the detuning parameter for the step size.
It should be noted that: the first two steps of the iteration formula of the NLMS method are the same as the LMS, except that the filter tap coefficient calculation method in the last step is different. The small n in the formula represents discrete time, i.e. the nth data. d (n), y (n), e (n) are digital samples representing voltage in units of V. ω (n), μ, Ψ, etc. are coefficients, which have no unit per se.
Fig. 4 and 5 are diagrams for explaining the effect of the method, suppressing noise and reducing the communication error rate.
After the application runs secretly for a period of time, the feedback of field technicians has the advantages that:
the method provided by the application does not need to model the noise characteristic in advance, and is simple to implement. The noise suppression not only aims at impulse noise, has better adaptability, does not need to be combined with a specific communication modulation coding scheme, and has application independence.
The adaptive filtering algorithm used in the method is not limited to the method described herein, and all algorithms based on the adaptive filtering principle can be used.
Compared with the embodiment, the noise reduction device further comprises a first HPLC chip for modulating the noise reduction signal e (n), wherein the output end of the subtracter is electrically connected and communicated with the first HPLC chip, and the noise reduction signal e (n) is demodulated through the first HPLC chip for transmission.
Compared with the embodiment, the device further comprises a concentrator, the first HPLC chip is electrically connected with and communicates with the concentrator, and the first HPLC chip demodulates the noise reduction signal e (n) and then sends the demodulated noise reduction signal e (n) to the concentrator.
With respect to the above embodiment, the concentrator further includes a server and a wireless communication device, the concentrator is connected to the private internet through the wireless communication device, the server is connected to the private internet through the wireless communication device, and the concentrator is connected to and communicates with the server through the wireless communication device and the private internet. The concentrator receives the demodulated signal and forwards it to the server via the wireless communication means and the private internet.
With respect to the above embodiment, further comprising an electric meter, the first HPLC chip is electrically connected and in communication with the electric meter. The concentrator and the electric meter carry out data transmission through the power line based on respective HPLC chips, and the self-adaptive power line noise suppressor can be used as an independent part to assist the demodulation work of the HPLC chip and can also be embedded into the HPLC chip, so that the effect of reducing the communication error rate is finally achieved.
Claims (10)
1. An HPLC-oriented power line noise suppression method is characterized in that: the method comprises the steps of extracting a pre-noise N '(N) from a power line according to a preset pre-time based on an adaptive power line noise suppressor, carrying out adaptive noise suppression on a power line signal d (N) through the pre-noise N' (N) and obtaining a noise reduction signal e (N), wherein the adaptive power line noise suppressor comprises an adaptive filter and a subtracter which are electrically connected with each other.
2. An HPLC-oriented power line noise suppression method according to claim 1, characterized in that: the subtractor comprises two input ends and an output end, the two input ends of the subtractor are respectively a first input end and a second input end, the output end of the adaptive filter is electrically connected with the second input end of the subtractor, the output end of the subtractor is electrically connected with the control end of the adaptive filter, and the adaptive filter and the subtractor which are electrically connected with each other form an adaptive power line noise suppressor.
3. An HPLC-oriented power line noise suppression method according to claim 2, characterized in that: the method specifically comprises the following steps:
s1 collecting power line signal
Obtaining a digitalized power line signal d (n) from a power line and inputting the digitalized power line signal d (n) to a first input end of the subtracter;
s2 obtaining pre-noise
Acquiring a pre-noise N '(N) from a power line according to a preset pre-time and inputting the pre-noise N' (N) to an input end of an adaptive filter;
s3 noise elimination
The adaptive power line noise suppressor performs subtraction calculation by using the input power line signal d (n) and the output y (n) of the adaptive filter to obtain and output a noise reduction signal e (n).
4. An HPLC-oriented power line noise suppression method according to claim 3, characterized in that: in step S1, the strong electricity is isolated by the coupler and converted by the analog-to-digital converter to obtain a digitized power line signal d (n).
5. An HPLC-oriented power line noise suppression method according to claim 3, characterized in that: in the step of S1, the power line signal d (n) includes a communication signal x (n) of the power line and noise n (n).
6. An HPLC-oriented power line noise suppression method according to claim 1, characterized in that: the lead time is 20 ms.
7. An HPLC-oriented power line noise suppression method according to claim 2, characterized in that: the noise reduction circuit also comprises a first HPLC chip used for demodulating the noise reduction signal e (n), and the output end of the subtracter is electrically connected and communicated with the first HPLC chip.
8. An HPLC-oriented power line noise suppression method according to claim 7, characterized in that: also included is a concentrator, the first HPLC chip being in electrical connection and communication with the concentrator.
9. An HPLC-oriented power line noise suppression method according to claim 8, characterized by: the concentrator is connected to the private internet through the wireless communication device, the server is connected to the private internet through the wireless communication device, and the concentrator is connected and communicates with the server through the wireless communication device and the private internet.
10. An HPLC-oriented power line noise suppression method according to claim 7, characterized in that: also included is an electric meter, the first HPLC chip being electrically connected and in communication with the electric meter.
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| WO2007109945A1 (en) * | 2006-03-29 | 2007-10-04 | Huawei Technologies Co., Ltd. | A method and device for reducing surrounding coupled noise |
| CN105227214A (en) * | 2014-06-27 | 2016-01-06 | 无锡汉兴电子有限公司 | A kind of power line communication receiving system and method for reseptance |
| CN108649997A (en) * | 2018-04-19 | 2018-10-12 | 国网重庆市电力公司电力科学研究院 | A kind of self adaptive elimination method of multiple-input, multiple-output power line communication narrow-band noise, system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007109945A1 (en) * | 2006-03-29 | 2007-10-04 | Huawei Technologies Co., Ltd. | A method and device for reducing surrounding coupled noise |
| CN105227214A (en) * | 2014-06-27 | 2016-01-06 | 无锡汉兴电子有限公司 | A kind of power line communication receiving system and method for reseptance |
| CN108649997A (en) * | 2018-04-19 | 2018-10-12 | 国网重庆市电力公司电力科学研究院 | A kind of self adaptive elimination method of multiple-input, multiple-output power line communication narrow-band noise, system |
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Application publication date: 20210702 |