阅读说明：本技术 一种电力载波通信测试模拟系统及方法 (Power line carrier communication test simulation system and method ) 是由 李汐 孙剑锋 崔胜胜 马斌 杨艳 高阳 华书蓓 刘于超 董永康 范文婧 王中敏 于 2021-07-01 设计创作，主要内容包括：一种电力载波通信测试模拟系统及方法,涉及电力载波通信技术领域,通过现场采集负荷波形、基波波形还原曲线、注入噪声影响因子、仿真还原波形、物理输出波形等步骤,实现电能表载波通信测试,建立特征库。本发明的有益效果在于：本发明搭建了一种载波模块通信现场测试环境；得出影响现场通信质量的影响因子,可以对现场环境因素进行调节得到需要的测试波形,完善载波模块通信的现场特征库。(A power carrier communication test simulation system and a method relate to the technical field of power carrier communication, and realize the power meter carrier communication test and establish a feature library by the steps of collecting a load waveform, a fundamental wave waveform reduction curve, injecting a noise influence factor, simulating a reduction waveform, physically outputting the waveform and the like on site. The invention has the beneficial effects that: the invention builds a carrier module communication field test environment; and obtaining an influence factor influencing the field communication quality, adjusting field environment factors to obtain a required test waveform, and perfecting a field characteristic library of the carrier module communication.)

1. A power line carrier communication test simulation system is characterized by comprising a wave recorder, a power quality analyzer, a D/A board card, a power source, a cable, noise factor adjusting equipment and an electric energy meter with an HPLC module; the wave recorder, the electric energy quality analyzer, the D/A board card, the power source, the cable and the electric energy meter with the HPLC module are sequentially connected, and the noise factor adjusting device is connected with the cable.

2. A power line carrier communication test simulation method, based on the power line carrier communication test simulation system of claim 1, the simulation method comprising the steps of:

the first step is as follows: acquiring a load waveform on site by using a wave recorder;

the second step is that: extracting a fundamental wave waveform by the electric energy quality analyzer, and restoring the fundamental wave waveform to obtain a fundamental wave waveform restoration curve;

the third step: converting the digital signal into an analog signal by the fundamental wave waveform reduction curve through a D/A board card, and carrying out waveform amplification through a power source to obtain a basic waveform with the same amplitude as the waveform acquired on site;

the fourth step: according to the influence of the environment on the site, corresponding noise factor adjusting equipment is loaded to the cable, and the noise influence factor is injected into the fundamental wave waveform reduction curve;

the fifth step: physically outputting a waveform, loading the reduction waveform to an electric energy meter with an HPLC module, and observing and analyzing changes of the HPLC module and the electric energy meter;

sixthly, adjusting the physical output waveform by adjusting the noise parameters and the line parameters, further obtaining a plurality of groups of analysis data, and establishing a feature library;

and seventhly, analyzing and acquiring influence factors related to success rate in a multi-dimensional manner aiming at various feature libraries.

3. The power carrier communication test simulation method of claim 2, wherein the line parameters comprise impedance parameters, phase parameters, and time-varying parameters.

4. The power carrier communication test simulation method according to claim 2, wherein the feature library comprises an impedance feature library, a load feature library, a harmonic noise feature library, and an environmental noise feature library.

5. The power line carrier communication test simulation method of claim 2, wherein the adjusting of the line parameters refers to returning to the fourth step, adjusting the line parameters, then performing physical output waveform, and sequentially completing the subsequent steps.

6. The power line carrier communication test simulation method of claim 2, wherein the adjusting the noise parameter refers to returning to the fourth step, adjusting the noise parameter when injecting the noise influence factor into the fundamental wave shape reduction curve, and sequentially completing the subsequent steps.

Technical Field

The invention relates to the technical field of power line carrier communication, in particular to a power line carrier communication test simulation system and a power line carrier communication test simulation method.

Background

At present, more than 2000 and more than 50 million intelligent electric energy meters are operated by provincial companies, and all communication modes of power line carrier (HPLC) are adopted. The quantity of carrier modules arranged in the electric energy meter and the acquisition terminal is large, and the HPLC module is purchased with more capital investment every year and used for field fault maintenance.

With the continuous promotion and application of object-oriented communication protocols and HPLC technologies in the field, the existing detection means and methods are difficult to completely adapt to the actual field needs. In daily detection work, various functions of developing the electric energy meter and collecting equipment in a laboratory are good and reliable, but the conditions of poor collecting success rate and integrity rate can occur after the equipment is deployed on site.

The reason for this is that the existing power line carrier communication test system cannot fully study the influence factors and channel conditions of the field power line carrier environment, and cannot realize the laboratory recurrence work of the field complex power line carrier environment, so that the above problems occur.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a power line carrier communication test simulation system and a power line carrier communication test simulation method.

The invention provides a power line carrier communication test simulation system, which comprises a wave recorder, a power quality analyzer, a D/A board card, a power source, a cable, noise factor adjusting equipment and an electric energy meter with an HPLC module; the wave recorder, the electric energy quality analyzer, the D/A board card, the power source, the cable and the electric energy meter with the HPLC module are sequentially connected, the noise factor adjusting device is connected with the cable,

the electric energy meter with the HPLC module is connected with an electric energy meter load.

A power line carrier communication test simulation method, the power line carrier communication test simulation system, the test simulation method includes the following steps:

the first step is as follows: acquiring a load waveform on site by using a wave recorder;

the second step is that: extracting a fundamental wave waveform by the electric energy quality analyzer, and restoring the fundamental wave waveform to obtain a fundamental wave waveform restoration curve;

the third step: converting the digital signal into an analog signal by the fundamental wave waveform reduction curve through a D/A board card, and carrying out waveform amplification through a power source to obtain a basic waveform with the same amplitude as the waveform acquired on site;

the fourth step: according to the influence of the environment on the site, corresponding noise factor adjusting equipment is loaded to the cable, and the noise influence factor is injected into the fundamental wave waveform reduction curve;

the fifth step: physically outputting a waveform, loading the reduction waveform to an electric energy meter with an HPLC module, and observing and analyzing changes of the HPLC module and the electric energy meter;

sixthly, adjusting the physical output waveform by adjusting the noise parameters and the line parameters, further obtaining a plurality of groups of analysis data, and establishing a feature library;

and seventhly, analyzing and acquiring influence factors related to success rate in a multi-dimensional manner aiming at various feature libraries.

The line parameters comprise impedance parameters, phase parameters and time-varying parameters.

And the line parameter adjustment refers to returning to the fourth step, adjusting the line parameters, then carrying out physical output waveform, and sequentially finishing the subsequent steps.

And the noise parameter adjustment refers to returning to the fourth step, adjusting the noise parameter when injecting the noise influence factor into the fundamental wave waveform reduction curve, and sequentially finishing the subsequent steps.

The invention has the beneficial effects that: the invention builds a carrier module communication field transmission environment; and obtaining an influence factor influencing the field communication quality, and adjusting field environment factors to obtain a required test waveform. And perfecting the field characteristic library of the carrier module communication by changing parameters.

According to the invention, the influence factors and channel conditions of the field power line carrier environment are fully researched, the laboratory reproduction work of the field complex power line carrier environment is smoothly completed, the field environment of carrier communication application is reproduced, the quality control level of the electric energy meter and the acquisition equipment is comprehensively improved, and the field adaptability of the equipment is practically improved by checking the state from a detection source.

Drawings

FIG. 1 is a block diagram of a test simulation system connection;

FIG. 2 is a flow chart of a test simulation method according to the present invention.

Detailed Description

The embodiment 1 provides a power line carrier communication test simulation system, which comprises a wave recorder, an electric energy quality analyzer, a D/A board card, a power source, a cable, noise factor adjusting equipment and an electric energy meter with an HPLC module; the wave recorder, the electric energy quality analyzer, the D/A board card, the power source, the cable and the electric energy meter with the HPLC module are sequentially connected, the noise factor adjusting device is connected with the cable, and the electric energy meter with the HPLC module is connected with an electric energy meter load.

A power line carrier communication test simulation method, the power line carrier communication test simulation system, the test simulation method includes the following steps:

the first step is as follows: and acquiring the load waveform on site by using a wave recorder.

The second step is that: extracting a fundamental wave waveform by the electric energy quality analyzer, and restoring the fundamental wave waveform to obtain a fundamental wave waveform restoration curve;

typical distribution areas selected by field acquisition waveforms are classified into three main categories on the aspect of power consumption attributes: rural districts, urban districts and large industrial districts. Wherein, the large industrial users are all special transformer areas, and adopt 485 local communication modes at the present stage.

The rural area generally has the conditions of user dispersion, crossed electricity utilization types, special electromagnetic environment and the like; the town area generally has the characteristics of centralized users, obvious electricity consumption peak valley, uniform electricity consumption types and the like; the large-scale industrial platform area has the conditions of large power consumption load, highly centralized power consumption area, complex power consumption and the like.

The communication frequency band of a typical distribution area is 0.6-3 MHZ, and the communication between the concentrator and the general table is RS 485. According to the field situation, the voltage, the current, the frequency, the harmonic wave and other data of a typical platform area are measured and collected by an electric energy quality analyzer.

The field data acquisition uses a daily recorder accepted in the industry and an electric energy quality analyzer of the Fuluke company, sinusoidal fundamental wave and harmonic wave distribution are extracted through field recording and analysis, fundamental wave frequency and amplitude parameters, harmonic noise distribution and content of the harmonic noise are given, and therefore laboratory field simulation reduction is guided.

The third step: converting the digital signal into an analog signal by the fundamental wave waveform reduction curve through a D/A board card, and carrying out waveform amplification through a power source to obtain a basic waveform with the same amplitude as the waveform acquired on site;

the fourth step: according to the influence of the environment on the site, corresponding noise factor adjusting equipment is loaded to the cable, and the noise influence factor is injected into the fundamental wave waveform reduction curve;

according to the environmental influence of the site, noise influence factors are injected into the fundamental wave waveform reduction curve. The noise source (including a three-phase coupler) is added with a noise coupler in order to simulate the influence of the actual complex environment on the field on the impedance of a power line channel and the influence on the communication performance, the noise is connected to the power line through the coupler, one side of a coupler port is a BNC interface and is connected with a signal source, and one section of the coupler port is a strong electric terminal and is connected with the power line. The influence of noise in a line on a broadband carrier in practical application is simulated by coupling noise to a power carrier line.

The noise mainly comprises harmonic noise and environmental noise, wherein the harmonic noise comprises harmonic content, harmonic distribution and harmonic attenuation characteristics. The environmental noise comprises pulse signals, electromagnetic interference and lightning interference.

The fifth step: physically outputting a waveform, loading the reduction waveform to an electric energy meter with an HPLC module, and observing and analyzing changes of the HPLC module and the electric energy meter;

sixthly, adjusting the physical output waveform by adjusting the noise parameters and the line parameters, further obtaining a plurality of groups of analysis data, and establishing a feature library;

(1) impedance parameter

The power line is regarded as a transmission line, various complex loads are connected on the power line, the loads and the characteristic impedance of the power line are combined into a plurality of resonance loops, and a low impedance area is formed at the resonance frequency and nearby frequency points, so that the phenomenon that the impedance changes suddenly along with the increase of the frequency in a local frequency band is caused. Therefore, the more complex the electricity utilization characteristics and the network structure of the low-voltage distribution network, the more complex the impedance characteristics. Although the loads are switched on or off randomly on the power line, due to the numerous loads and the combined action, the characteristic that the input impedance of a certain measuring point of the low-voltage distribution network changes along with time is relatively stable, and the characteristic of a field is shown, but the characteristic of a road is not shown, and is determined by the whole network structure of the low-voltage distribution area.

(2) Phase parameter

In the signal transmission process of the low-voltage power line carrier communication channel, due to the influence of various factors such as time delay and the like, phase shift can be generated in the signal transmission process. Because the signals transmitted by the low-voltage power line carrier communication channel are mostly sinusoidal signals or combinations of sinusoidal signals with different frequencies, phases and amplitudes, the signals are often very complex, the attenuation of the signals can be very unstable under the influence of various transmission factors, and the signals transmitted by the low-voltage power line carrier communication channel can generate certain phase shift due to the influence of time delay characteristics, so that the complexity and difficulty degree of signal receiving and recovery are further increased, and the low-voltage power line carrier communication is very unfavorable.

(3) Time varying parameter

The loads of the power grid are repeatedly switched on and off by corresponding equipment in the power system due to continuous access and cut-out in a period of time, the loads which are randomly accessed and cut-out are not regular, namely, randomness exists in the loads, and then the characteristics of the power transmission channel are time-varying. Generally, during voltage transmission, the attenuation degree of a power line to a power signal with certain frequency in 1s time due to time variation may reach a high degree, and the high-intensity attenuation causes voltage detection, so that scientific determination of a circuit signal cannot be reasonably realized. In particular, the time-varying channel characteristics during power transmission may cause the transmitted power signal to be superimposed on the time-varying channel characteristics, resulting in time-selective characteristics of the transmitted signal, resulting in signal distortion.

According to data feature extraction, 4 basic feature libraries are established: impedance feature library, load feature library, harmonic noise feature library and environment noise feature library.

And seventhly, analyzing and acquiring influence factors related to success rate in a multi-dimensional manner aiming at various feature libraries.

Feature library and influencing factors

Feature library	Influencing factor
		Library of impedance features	(1) NetA hierarchy of links; (2) conducting wire parameters; (3) the transmission distance.
Load characteristic library	(1) A load type; (2) a load power characteristic; (3) and (4) load behavior.
		Harmonic noise feature library	(1) The total content of harmonic waves; (2) harmonic distribution: (3) an attenuation characteristic;
ambient noise feature library	(1) A pulse signal; (2) electromagnetic interference; (3) and (4) lightning interference.