CN209148771U - A kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle - Google Patents

A kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle Download PDF

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Publication number
CN209148771U
CN209148771U CN201821415838.7U CN201821415838U CN209148771U CN 209148771 U CN209148771 U CN 209148771U CN 201821415838 U CN201821415838 U CN 201821415838U CN 209148771 U CN209148771 U CN 209148771U
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module
voltage
harmonics
measurement
complete cycle
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贺中桥
刘波
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State Grid Corp of China SGCC
Xuzhou Power Supply Co of Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
Xuzhou Power Supply Co of Jiangsu Electric Power Co Ltd
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Abstract

The utility model provides a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle, and the harmonic measurement device includes current transformer, voltage transformer, signal conditioning circuit, A/D conversion module, frequency multiplication of phase locked loop circuit and signal acquisition process module;The harmonic measurement device obtains electric current, information of voltage by the current transformer and the voltage transformer, the electric current, the information of voltage that detect are improved by the conditioning circuit, the digital signal input signal acquisition process module is converted by the A/D conversion module again, the signal acquisition process module can be monitored voltage fundamental frequency and current first harmonics frequency, analytical calculation, and then realize harmonic detection function, and will test result and carry out storage and show.The utility model provides a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle, effectively increases the accuracy of electric harmonic detection.

Description

A kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle
Technical field
The utility model belongs to technical field of electric power detection, in particular to a kind of power train based on synchronized sampling complete cycle System harmonic measurement device.
Background technique
Since entry into the electric era, electric power has been 21st century indispensable important energy source, not with society Disconnected progress and rapid development of economy, the production and living level of the mankind are all greatly improved, various types in electric system Number the nonlinear loads such as motor, fairing, electric arc furnaces and alternating current-direct current convertor equipment and impact load be continuously increased, Cause the electric harmonic problem in utility network more serious.The direct performance of influence of these nonlinear loads to electric system It is the Severe distortion of electric current, voltage waveform, not there is only frequency sinusoidal quantity identical with power supply, referred to as fundametal compoment, A series of sinusoidal components for the integral multiple that frequency is fundametal compoment frequency are had also appeared, a series of this component is exactly electric harmonic.
For electric system, the seriousness of harmonic pollution is very important, it will cause the production, transmission and utilization of electric energy Efficiency reduce;What it can have no sign just generates some failures, may make machine that can be burned out;It additionally can severe jamming electricity The normal work etc. of communication Instrument in Force system.In electric power and electronics industry, the harmfulness of the harmonic pollution in power grid day It is increasingly acute, it is necessary to which that the harmonic content effectively in analysis power grid selects corresponding necessary suppression according to the data cases in content respectively Method processed.In order to ensure the safety of operation of power networks, Harmfulness Caused by Harmonics don't fail to be avoided by harmonic controling within safe range It generates and expands.Therefore, problem for power system harmonics is in depth studied, harmonic carcellation pollution is allowing harmonic content control In range, to the safe and economic operation of power supply system, the protection of electric system and the safe operation of electrical equipment have great meaning Justice.Electric harmonic detection technique frequency resolution is not high at present, influences vulnerable to spectral leakage, and how to improve optimization becomes electricity One of the work of power harmonic detecting technique.
Utility model content
The utility model provides a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle, effectively increases The accuracy of electric harmonic detection.
The utility model is specially a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle, the harmonic wave Detection device includes current transformer, voltage transformer, signal conditioning circuit, A/D conversion module, frequency multiplication of phase locked loop circuit and letter The input terminal of number acquisition processing module, the current transformer and voltage transformer is connect with power grid, the current transformer and The output end of voltage transformer is connected with the input terminal of the signal conditioning circuit, the output end of the signal conditioning circuit It is connected with the input terminal of the A/D conversion module, the output end of the A/D conversion module and the signal acquisition process module Input terminal is connected, and the input terminal of the frequency multiplication of phase locked loop circuit is connect with the output end of the voltage transformer, the locking phase The output end of ring frequency multiplier circuit is connected with the signal acquisition process module;The harmonic measurement device is mutual by the electric current Sensor and the voltage transformer obtain electric current, information of voltage, by the signal conditioning circuit to electric current, the voltage detected Information, which is improved, is converted into digital data transmission to the signal acquisition process module, institute by the A/D conversion module again Stating signal acquisition process module can be monitored, analyzes and calculate to voltage fundamental frequency and current first harmonics frequency, in turn It realizes harmonic detection function, and will test result and carry out storage and show.
The signal conditioning circuit includes add circuit and filter circuit, realizes the adjustment to input signal to reach described The job requirement of A/D conversion module.
The method that the frequency multiplication of phase locked loop circuit takes in one cycle measured signal uniform sampling at equal intervals, can Realize synchronized sampling complete cycle, avoiding the acquisition link of signal, there is a phenomenon where spectral leakages;The frequency multiplication of phase locked loop circuit is adopted Use CD4046 chip as phaselocked loop, 3~18V of supply voltage range, input impedance 100M Ω were realized in a complete cycle Sample frequency is 128.
The signal acquisition process module can calculate the three-phase current of the power grid, three-phase voltage, active power, idle Power and percent harmonic distortion, the signal acquisition process module include arm processor, memory module, display module and communication Module, the arm processor are connected respectively to the memory module, the display module and the communication module;At the ARM Reason device is analyzed and processed the signal of acquisition using minimum modulus multiple signal classification algorithm, obtains the amplitude and frequency of each harmonic Rate and their parameter characteristic can obtain required parameter by relevant mathematical computations, realize harmonic detection function, And then stored by the memory module, it is shown, is realized by the communication module remote by the display module Cheng Tongxin.
Detailed description of the invention
Fig. 1 is a kind of structural representation of the Measurement of Harmonics in Power System device based on synchronized sampling complete cycle of the utility model Figure.
Specific embodiment
The Measurement of Harmonics in Power System device based on synchronized sampling complete cycle a kind of to the utility model with reference to the accompanying drawing Specific embodiment elaborate.
As shown in Figure 1, the harmonic measurement device of the utility model includes current transformer, voltage transformer, signal condition Circuit, A/D conversion module, frequency multiplication of phase locked loop circuit and signal acquisition process module, the current transformer and voltage transformer Input terminal connect with power grid, the output end of the current transformer and voltage transformer is defeated with the signal conditioning circuit Enter end to be connected, the output end of the signal conditioning circuit is connected with the input terminal of the A/D conversion module, and the A/D turns Mold changing block output end be connected with the signal acquisition process module input terminal, the input terminal of the frequency multiplication of phase locked loop circuit and The output end of the voltage transformer connects, the output end of the frequency multiplication of phase locked loop circuit and the signal acquisition process module phase Connection;The harmonic measurement device obtains electric current, information of voltage by the current transformer and the voltage transformer, passes through The signal conditioning circuit, which improves the electric current, the information of voltage that detect, is converted into number by the A/D conversion module again Word signal is transmitted to the signal acquisition process module, and the signal acquisition process module can be to voltage fundamental frequency and electricity Stream fundamental frequency is monitored, analyzes and calculates, and then realizes harmonic detection function, and will test result and carry out storage and show.
The signal conditioning circuit includes add circuit and filter circuit, realizes the adjustment to input signal to reach described The job requirement of A/D conversion module.
The method that the frequency multiplication of phase locked loop circuit takes in one cycle measured signal uniform sampling at equal intervals, can Realize synchronized sampling complete cycle, avoiding the acquisition link of signal, there is a phenomenon where spectral leakages;The frequency multiplication of phase locked loop circuit is adopted Use CD4046 chip as phaselocked loop, 3~18V of supply voltage range, input impedance 100M Ω were realized in a complete cycle Sample frequency is 128.
The signal acquisition process module can calculate the three-phase current of the power grid, three-phase voltage, active power, idle Power and percent harmonic distortion, the signal acquisition process module include arm processor, memory module, display module and communication Module, the arm processor are connected respectively to the memory module, the display module and the communication module;At the ARM Reason device is analyzed and processed the signal of acquisition using minimum modulus multiple signal classification algorithm, obtains the amplitude and frequency of each harmonic Rate and their parameter characteristic can obtain required parameter by relevant mathematical computations, realize harmonic detection function, And then stored by the memory module, it is shown, is realized by the communication module remote by the display module Cheng Tongxin.
Finally it should be noted that only illustrating the technical solution of the utility model in conjunction with above-described embodiment rather than limiting it System.Those of ordinary skills in the art should understand that arriving, those skilled in the art can be to the specific implementation of the utility model Mode is modified or replaced equivalently, but these modifications or change are being applied among pending claims.

Claims (4)

1. a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle, which is characterized in that the harmonic detecting dress It sets including current transformer, voltage transformer, signal conditioning circuit, A/D conversion module, frequency multiplication of phase locked loop circuit and signal acquisition The input terminal of processing module, the current transformer and voltage transformer is connect with power grid, and the current transformer and voltage are mutual The output end of sensor is connected with the input terminal of the signal conditioning circuit, the output end of the signal conditioning circuit with it is described The input terminal of A/D conversion module is connected, the output end of the A/D conversion module and the signal acquisition process module input terminal It is connected, the input terminal of the frequency multiplication of phase locked loop circuit is connect with the output end of the voltage transformer, the frequency multiplication of phase locked loop The output end of circuit is connected with the signal acquisition process module;The harmonic measurement device by the current transformer and The voltage transformer obtains electric current, information of voltage, by the signal conditioning circuit to detect electric current, information of voltage into Row conditioning is converted into digital data transmission to the signal acquisition process module, the signal by the A/D conversion module again Acquisition processing module can be monitored, analyze and calculate to voltage fundamental frequency and current first harmonics frequency, and then realize humorous Wave detection function, and will test result and carry out storage and show.
2. a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle according to claim 1, feature It is, the signal conditioning circuit includes add circuit and filter circuit, realizes the adjustment to input signal to reach the A/D The job requirement of conversion module.
3. a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle according to claim 1, feature It is, the frequency multiplication of phase locked loop circuit is using CD4046 chip as phaselocked loop, 3~18V of supply voltage range, input impedance 100M Ω realizes that the sample frequency in a complete cycle is 128.
4. a kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle according to claim 1, feature It is, the signal acquisition process module includes arm processor, memory module, display module and communication module, at the ARM Reason device is connected respectively to the memory module, the display module and the communication module.
CN201821415838.7U 2018-08-31 2018-08-31 A kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle Active CN209148771U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112595892A (en) * 2020-12-24 2021-04-02 哈尔滨理工大学 Power grid harmonic detection device
CN112730975A (en) * 2020-12-28 2021-04-30 国网黑龙江省电力有限公司电力科学研究院 Electric quantity metering system and network loss evaluation system realized by adopting same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112595892A (en) * 2020-12-24 2021-04-02 哈尔滨理工大学 Power grid harmonic detection device
CN112730975A (en) * 2020-12-28 2021-04-30 国网黑龙江省电力有限公司电力科学研究院 Electric quantity metering system and network loss evaluation system realized by adopting same

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