CN-121984537-A - Anti-interference optimization method, system, equipment and medium for HPLC (high performance liquid chromatography) channel of station area

CN121984537ACN 121984537 ACN121984537 ACN 121984537ACN-121984537-A

Abstract

The invention discloses a method, a system, equipment and a medium for optimizing anti-interference of a HPLC (high performance liquid chromatography) channel of a station area, which comprises the steps of collecting load data through an intelligent measuring terminal and synchronizing time to generate an original load data set, generating a probe signal in a digital signal processor, injecting the probe signal into a power line after OFDM modulation, carrying out short-time Fourier transform on a carrier signal by a receiving end, dividing the full frequency band of the HPLC into a plurality of sub-channels, calculating the average interference intensity and the average signal-to-noise ratio of each sub-channel based on the power spectrum difference value of the probe signal, introducing adjacent sub-channel interference correlation factors, calculating distribution priority factors by combining the indexes, sorting, selecting high priority sub-channels to form a high quality sub-channel set, carrying out LDPC coding on the original data to generate a complete coding block sequence, distributing the number of coding blocks according to the priority proportion of each sub-channel, and determining the final transmission data quantity by taking the maximum transmission capacity of the sub-channel as a limit, thereby realizing reliable parallel transmission of the high-frequency collected data.

Inventors

JIANG XUEJIAO
FU ZHENG
CHEN LINCONG
ZHONG LEI
XU JIALONG
GAO LEI
WU MIN
WU QINGYAO
WU HAIJIE
GU TINGTING

Assignees

海南电网有限责任公司

Dates

Publication Date: 20260505
Application Date: 20251211

Claims (10)

1. The anti-interference optimization method for the HPLC channel of the station area is characterized by comprising the following steps: acquiring load data and performing time stamp synchronization to generate an original load data set; generating a probe signal in a digital signal processor based on the high frequency transmission requirement of the original load data set, and loading the probe signal to a power line through orthogonal frequency division multiplexing modulation; Performing short-time Fourier transform on the power line carrier signal at a receiving end, dividing the full frequency band of the high-speed power line carrier communication into a plurality of sub-channels, and calculating the average interference intensity and the average signal-to-noise ratio of each sub-channel based on the power spectrum difference value of the probe signal; Introducing adjacent sub-channel interference correlation factors, combining the average interference intensity and the average signal-to-noise ratio, calculating and sequencing the distribution priority factors of all sub-channels, and selecting a plurality of sub-channels with highest priorities to form a high-quality sub-channel set; And performing low-density parity check code coding on the original load data set to generate a complete coding block sequence, distributing the number of coding blocks according to the proportion of the distribution priority factors of all the sub-channels, and determining the final transmission data quantity to the limit that the maximum capacity of the sub-channels is not exceeded.
2. The method for optimizing the anti-interference performance of a district HPLC channel according to claim 1, wherein the probe signal comprises: Generating a pseudo-random baseband signal by adopting a maximum length sequence; Performing quadrature phase shift keying modulation on the baseband signal; And adapting the modulated signal to the sub-channel bandwidth and covering the full frequency band of the high-speed power line carrier communication.
3. The method for optimizing the anti-interference performance of the HPLC channel of the area according to claim 1 or 2, wherein the generating the probe signal in the digital signal processor comprises the following steps: increasing the transmitting power of the probe signal in the low frequency band; inserting probe pulses with shorter duration at random time intervals in a high frequency band; the power spectral density distribution of the probe signal is adjusted by a digital filter.
4. The method for optimizing the anti-interference performance of the HPLC channel of the area according to claim 3, wherein said calculating the average interference intensity and the average signal to noise ratio of each sub-channel based on the probe signal power spectrum difference value comprises: Subtracting the power spectral density of the known probe signal from the power spectral density of the received signal to obtain an interference and noise power spectrum; Integrating the interference and noise power spectrum over a center frequency and corresponding bandwidth range of each subchannel; and taking logarithm of the integration result to convert the logarithm into a decibel value to be used as the interference intensity of the corresponding sub-channel.
5. The method for optimizing the anti-interference of the HPLC channel of the area of claim 4, wherein the step of introducing the adjacent sub-channel interference correlation factor includes: calculating the absolute value of the difference between the average interference intensities of the current sub-channel and the previous sub-channel; calculating the absolute value of the difference between the average interference intensities of the current sub-channel and the subsequent sub-channel; and weighting and summing according to the two absolute values, and generating an interference correlation factor by combining the correlation weight coefficients.
6. The method for optimizing the anti-interference performance of a district HPLC channel of claim 5 wherein the assigning priority factor comprises: Applying an exponential decay term to the average interference intensity; weighting and fusing the average signal-to-noise ratio, the attenuated average interference intensity and the interference correlation factor; And carrying out normalization processing on the weighted results of all the sub-channels to obtain the distribution priority factor.
7. The method for optimizing the anti-interference performance of the HPLC channel of the station area of claim 6, wherein the step of allocating the number of the coding blocks according to the allocation priority factor proportion of each sub-channel comprises the following steps: multiplying the total size of the coding block sequence with the allocation priority factor of each sub-channel to obtain preliminary allocation data quantity; Dividing the preliminary distribution data amount by the size of a single coding block and rounding downwards to obtain the number of integral coding blocks; multiplying the number of the coding blocks of the corresponding sub-channel with the size of the coding blocks to obtain the data volume of the corresponding sub-channel, comparing the data volume with the maximum transmission capacity of the corresponding sub-channel, and taking a smaller value as the finally allocated data volume.
8. A district HPLC channel anti-interference optimization system applying the method of any one of claims 1-7, comprising: the data acquisition and time synchronization module is used for acquiring load data and performing time stamp synchronization to generate an original load data set; The probe signal generating and injecting module is used for generating a probe signal in the digital signal processor based on the high-frequency transmission requirement of the original load data set and loading the probe signal to a power line through orthogonal frequency division multiplexing modulation; The sub-channel interference sensing and evaluating module is used for carrying out short-time Fourier transform on the power line carrier signal at the receiving end, dividing the full frequency band of the high-speed power line carrier communication into a plurality of sub-channels, and calculating the average interference intensity and the average signal-to-noise ratio of each sub-channel based on the power spectrum difference value of the probe signal; the high-quality sub-channel optimizing module is used for introducing adjacent sub-channel interference correlation factors, combining the average interference intensity and the average signal-to-noise ratio, calculating and sequencing the distribution priority factors of all sub-channels, and selecting a plurality of sub-channels with highest priorities to form a high-quality sub-channel set; And the coded data dynamic allocation module is used for carrying out low-density parity check code coding on the original load data set to generate a complete coded block sequence, allocating the number of the coded blocks according to the allocation priority factor proportion of each sub-channel, and determining the final transmission data quantity by limiting the maximum capacity of the sub-channel.
9. An electronic device, comprising: a memory for storing a program; a processor for loading the program to perform the steps of the method according to any one of claims 1-7.
10. A computer readable storage medium storing a program, which when executed by a processor, implements the steps of the method according to any one of claims 1-7.

Description

Anti-interference optimization method, system, equipment and medium for HPLC (high performance liquid chromatography) channel of station area Technical Field The invention relates to the technical field of anti-interference optimization, in particular to a method, a system, equipment and a medium for optimizing anti-interference of a HPLC channel of a station area. Background With the acceleration of the construction of a novel power system, novel flexible loads such as distributed photovoltaic, energy storage equipment and electric automobile charging piles are largely connected into a low-voltage transformer area, and the running state of a power distribution network becomes more dynamic, random and complex. In this case, the traditional data acquisition mode mainly comprising the 15 minute level and even the hour level has obviously not kept pace with the actual demands. Emerging advanced applications such as fault active early warning, electricity larceny prevention intelligent analysis, dynamic electricity price response and refined management of line loss of a platform all put stringent requirements on high frequency (such as seconds or minutes), low time delay, high reliability and high integrity on data. At present, high-speed power line carrier communication (HPLC) is widely applied to electric energy data acquisition because of the advantages of no need of extra wiring, low deployment cost, natural coverage of all power utilization nodes and the like. However, in an actual operation environment, the transformer area often has the problems of multiple load hybrid access, multiple circuit branches, frequent change of a topological structure, dense electromagnetic interference sources and the like. These factors can lead to drastic fluctuations in HPLC channel characteristics-for example, line impedance can change rapidly with load start-stop, switching power supplies can generate broadband noise, and high power equipment start-stop can also cause transient interference. As a result, the communication error rate increases, the packet loss rate increases, and even communication interruption occurs. The situation is also quite rare, so that the integrity and timeliness of the high-frequency acquisition task are difficult to guarantee, and the landing and effectiveness exertion of various real-time services of the intelligent station are severely restricted. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a method, a system, equipment and a medium for optimizing the anti-interference of the HPLC channel of the platform, which solve the problem that the stability, the integrity and the timeliness of high-frequency data acquisition are difficult to guarantee because the HPLC channel is easy to be interfered under the multi-load access and the complex electromagnetic environment. In order to solve the technical problems, the invention provides the following technical scheme: in a first aspect, the present invention provides a method for optimizing anti-interference of a HPLC channel of a cell, including: acquiring load data and performing time stamp synchronization to generate an original load data set; generating a probe signal in a digital signal processor based on the high frequency transmission requirement of the original load data set, and loading the probe signal to a power line through orthogonal frequency division multiplexing modulation; Performing short-time Fourier transform on the power line carrier signal at a receiving end, dividing the full frequency band of the high-speed power line carrier communication into a plurality of sub-channels, and calculating the average interference intensity and the average signal-to-noise ratio of each sub-channel based on the power spectrum difference value of the probe signal; Introducing adjacent sub-channel interference correlation factors, combining the average interference intensity and the average signal-to-noise ratio, calculating and sequencing the distribution priority factors of all sub-channels, and selecting a plurality of sub-channels with highest priorities to form a high-quality sub-channel set; And performing low-density parity check code coding on the original load data set to generate a complete coding block sequence, distributing the number of coding blocks according to the proportion of the distribution priority factors of all the sub-channels, and determining the final transmission data quantity to the limit that the maximum capacity of the sub-channels is not exceeded. As a preferable scheme of the anti-interference optimization method for the HPLC channel of the platform, the probe signal comprises the following components: Generating a pseudo-random baseband signal by adopting a maximum length sequence; Performing quadrature phase shift keying modulation on the baseband signal; And adapting the modulated signal to the sub-c