CN110850166A - Portable harmonic detector and harmonic analysis method thereof - Google Patents
Portable harmonic detector and harmonic analysis method thereof Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a portable harmonic detector and a harmonic analysis method. The parameter sampling circuit and the power supply circuit combine the electrical parameter sampling of the instrument and the power supply part of the device into a whole, and realize the power supply of the device while collecting the voltage and current parameters. The data processing circuit realizes data acquisition by using the singlechip and a peripheral circuit thereof, and performs data interaction and storage with the electric energy quality acquisition chip to realize parameter acquisition and calculation. The power quality acquisition chip part is used for carrying out harmonic analysis by using an existing chip special for power quality acquisition, and the communication circuit consists of an RS485 interface circuit and a WiFi circuit. The harmonic analysis method comprises three parts of harmonic data classification, harmonic data calculation and harmonic data analysis. The detector greatly reduces the cost of the device, reduces the whole volume of the device and is convenient for inspection personnel to use.
Description
Technical Field
The invention relates to the technical field of intelligent detection, in particular to a portable harmonic detector applied to harmonic measurement and a harmonic analysis method thereof.
Background
The quality of electric energy in an electric power system is always paid much attention, but the current focus is mainly on a power supply end and an industrial user end, and the harmonic problem in the residential electricity utilization field is not always paid much attention. Previously, when the thyristor technology and the frequency conversion technology are not used in a large amount in the field of residential power utilization, the harmonic problem of the residential power grid is not serious, and with the continuous development of scientific technology, a large number of electrical appliances with the thyristor rectification and frequency conversion technology adjusting functions appear in the residential electrical appliances, and the harmonic problem of the residential power grid is gradually revealed. Some power electronic type switching devices burn out due to severe harmonics; zero sequence current of the power grid can be increased due to harmonic waves, and even fire can be caused by overloading of the zero sequence cable. Therefore, the harmonic problem of the residential power grid is treated at an unbearable stage.
For harmonic waves, the premise of treatment is measurement and analysis, and the conventional harmonic wave detector is large in size and high in price; or the operation and use are complex, and the inspection personnel who are the same line are difficult to master and use.
Disclosure of Invention
The invention aims to provide a portable harmonic detector applied to harmonic measurement and a harmonic analysis method thereof, wherein the detector has the advantages of low manufacturing cost, small volume and convenient grasp and use by operators; and the harmonic analysis method used by the instrument is more intelligent and specialized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a portable harmonic detector comprises a parameter sampling circuit, a data processing circuit, a communication circuit and a power supply circuit, and is characterized in that the parameter sampling circuit and the power supply circuit combine the electrical parameter sampling of an instrument and the power supply part of the device into a whole, and the power supply of the device is realized while voltage and current parameters are collected.
The data processing circuit realizes data acquisition by using the singlechip and a peripheral circuit thereof, and performs data interaction and storage with the electric energy quality acquisition chip to realize close combination of parameter acquisition and calculation.
The electric energy quality acquisition chip part is used for carrying out harmonic analysis by using an existing chip special for electric energy quality acquisition, and realizes acquisition, calculation, storage and the like of harmonic data through data interaction with the singlechip.
The communication circuit comprises an RS485 communication interface and a WiFi module circuit, and the WiFi module circuit can be in data communication and display with corresponding APP software of a user mobile phone.
A harmonic analysis method of a portable harmonic detector is characterized by comprising three parts of harmonic data classification, harmonic data calculation and harmonic data analysis.
The harmonic data classification is to integrally classify the collected harmonic data into static data and dynamic data, and each type of data is divided into three parts, namely harmonic frequency, harmonic amplitude and harmonic power.
And the harmonic data calculation is to classify the classified data in the same unit, the same time period and the same frequency period to obtain a data group for comparison.
The data analysis is to analyze the classified and calculated data according to a given analysis method so as to obtain an analysis result, and the result obtained in the process is the characteristic analysis result of the harmonic wave of the test point, and comprises the following steps: harmonic source type estimation, harmonic damage index and treatment urgency index.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the portable harmonic detector, the special electric energy quality acquisition chip is adopted to acquire harmonic data, the acquisition, calculation, storage and the like of the harmonic data are realized through data interaction with the single chip microcomputer, the parameter sampling circuit and the power supply circuit of the device are integrated, and the power supply of the device is realized while the voltage and current signal parameters are acquired; after the two measures are adopted, the cost of the device is greatly reduced, and the whole volume of the device is reduced.
2. The communication circuit of the portable harmonic detector adopts two circuits, namely an RS485 communication interface and a WiFi module chip, so that the device can not only carry out conventional data communication service with equipment such as an external PC (personal computer) and the like, but also can carry out communication with external wireless equipment through the WiFi circuit, for example, the device can carry out wireless data transmission and communication with corresponding APP software of a user mobile phone, and a user can see the working condition of the detector through the mobile phone.
3. According to the portable harmonic detector, the single chip microcomputer chip is matched with the electric energy quality acquisition chip to perform intelligent analysis on the harmonic source characteristics of the inherent characteristics of the harmonic frequency spectrum, so that three parts of work of classifying the harmonic source type, judging the harmonic damage index and evaluating the governance urgency index are completed. The device has the characteristics of small volume and self-contained analysis function, can perform real-time test and analysis, gives harmonic damage grades and is convenient for inspection personnel to use.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the portable harmonic detector of the present invention.
FIG. 2 is a schematic diagram of a power supply circuit of the detector.
Fig. 3 is a schematic diagram of a voltage detection circuit of the detector.
Fig. 4 is a schematic diagram of a current detection circuit of the detector.
Fig. 5 is a schematic circuit diagram of the data processing unit of the detector.
FIG. 6 is a schematic diagram of a WiFi circuit of the detector of the present invention.
FIG. 7 is a block flow diagram of a harmonic analysis method of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1 to 6, the portable harmonic detector of the present invention is composed of a parameter sampling circuit, a data processing circuit, a communication circuit, and a power supply circuit. The parameter sampling circuit and the power supply circuit combine the electrical parameter sampling of the instrument and the power supply part of the device into a whole, and realize the power supply of the device while collecting the voltage and current parameters. The parameter sampling circuit is divided into a voltage sampling circuit 1 and a current sampling circuit 2; the voltage sampling circuit 1 can be divided into a switch power supply module 1-1 and a voltage detection module 1-2, the switch power supply module 1-1 can provide power for the detector device through a power supply management module 13, and meanwhile, the device is also provided with a backup battery (lithium battery) 12 for storing data; the voltage detection module 1-2 part can provide a voltage detection signal to finish the voltage sampling process; the current sampling circuit 2 can be divided into a current detection module 2-1 and a current energy-taking module 2-2, the current detection module 2-1 converts current data into voltage through a resistor while collecting the current data, and then the current energy-taking module 2-2 stores energy to form a support power supply 3 and achieve the auxiliary support effect on the power supply of the device. The acquired voltage and current signals are sent to the electric energy quality acquisition chip 4 through a voltage channel and a current channel, and the electric energy quality acquisition chip 4 adopts an ADE7880 data processing chip. The data processing circuit consists of a singlechip 5 and peripheral devices thereof, wherein the singlechip 5 adopts STM32F103RCT6, and the peripheral devices comprise a clock circuit 6, a data storage circuit 7, a key and reset circuit 8, an LCD display screen circuit 9 and the like; the communication circuit comprises an RS485 communication interface circuit 10 and a WiFi module chip circuit 11, so that the device can not only carry out conventional data communication service with equipment such as an external PC (personal computer), but also communicate with external wireless equipment through the WiFi circuit, and if the device can carry out wireless data transmission and communication with corresponding APP software of a user mobile phone, a user can see the working condition of the detector through the mobile phone. After the data processed by the electric energy quality acquisition chip 4 enters the circuit of the singlechip 5, the data is processed by the circuit of the singlechip 5 and then is sent to the memory circuit 7 for storage, and meanwhile, the singlechip 5 can also send instructions and data to the electric energy quality acquisition chip 4 according to the requirement to realize data interaction and communication, and finally, the analysis and calculation of the measured harmonic signals are realized.
FIG. 7 is a block flow diagram of a method of classifying harmonic sample data and analyzing a harmonic source. The analysis method is divided into three steps:
step one, data classification method
The grouping of static and dynamic data is done according to the natural classification of voltage and current. The static data refers to a data group which does not change within a unit time Δ T, and the dynamic data refers to a data group which changes within the unit time Δ T. Each data group is divided into two parts of frequency and amplitude, and forms an integral database with harmonic power, which is a result of the product of harmonic voltage and harmonic current in the same data acquisition time point.
Step two, data calculation is carried out
And classifying the classified data in the same unit, the same time period and the same frequency band to obtain a data group for comparison, and adding the time t into a database structure to enable the data to have time scale characteristics. And meanwhile, the dynamic data is subjected to variable time constant calculation, and the calculation method uses reciprocal average to calculate.
The data after the second step is completed form the following table
Step three, performing data analysis
And analyzing the classified and calculated data according to a specified analysis method, wherein the result obtained after the process is finished is the characteristic analysis result of the harmonic wave of the test point. The method comprises three category indexes of harmonic source type discrimination, harmonic damage index and treatment urgency index.
(1) Harmonic source type discrimination
Carrying out amplitude and frequency two-dimensional sequencing on all harmonic test data according to a voltage and current data group, wherein the frequency of the sequenced first three-bit data conforms to the rule of (np +/-1) f (n is a natural number, P is 6, 12), and then judging the group of data as a rectifier load, wherein the pulse number is P; if the frequency of the sorted front three-bit data conforms to the rule of (n +1) f (n is a natural number), judging the group of data as a smelting load; if the frequency of the sorted front three-bit data accords with a 3n (n is a natural number) rule, judging the group of data as a three-phase unbalanced load; if the frequency of the sorted front three-bit data accords with a 2n (n is a natural number) rule, judging the group of data as positive and negative half-wave asymmetric loads; if the data simultaneously conforms to the given rule, the load is judged to be other loads.
(2) Harmonic damage index K
The index of damage of harmonic waves to equipment is evaluated, and the calculation method comprises the following steps:
K＝∫t√∑n(Pfn*fn)2
wherein, PfnIs the effective value of single harmonic power
fn is the frequency of the harmonic wave,
t is the variation time.
The greater the K value, the greater the injury.
(3) Governing urgency index KJ
First, calculate the voltage urgency index KU：
Ku＝∫t√∑n(Ufn*fn)2
Wherein Ufn is the single harmonic voltage effective value.
fn is the harmonic frequency.
t is the variation time.
An index Ka is calculated:
Ka＝∫t√∑n(Afn*fn)2
wherein A isfnIs the effective value of the single harmonic current.
fn is the harmonic frequency.
t is the variation time.
The third is the index Kt:
Kt＝∫t√∑n(Tnu)2
wherein, TnuIs the single harmonic voltage distortion rate.
fn is the harmonic frequency.
t is the variation time.
Treating the urgent index as KUThe product of Ka and Kt, i.e.:
KJ＝Ku*Ka*Kt
calculated KJThe larger the value, the higher its urgency.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the portable harmonic detector, the special electric energy quality acquisition chip is adopted to acquire harmonic data, the acquisition, calculation, storage and the like of the harmonic data are realized through data interaction with the single chip microcomputer, the parameter sampling circuit and the power supply circuit of the device are integrated, and the power supply of the device is realized while the voltage and current signal parameters are acquired; after the two measures are adopted, the cost of the device is greatly reduced, and the whole volume of the device is reduced.
2. The communication circuit of the portable harmonic detector adopts two circuits, namely an RS485 communication interface and a WiFi module chip, so that the device can not only carry out conventional data communication service with equipment such as an external PC (personal computer) and the like, but also can carry out communication with external wireless equipment through the WiFi circuit, for example, the device can carry out wireless data transmission and communication with corresponding APP software of a user mobile phone, and a user can see the working condition of the detector through the mobile phone.
3. According to the portable harmonic detector, the single chip microcomputer chip is matched with the electric energy quality acquisition chip to perform intelligent analysis on the harmonic source characteristics of the inherent characteristics of the harmonic frequency spectrum, so that three parts of work of classifying the harmonic source type, judging the harmonic damage index and evaluating the governance urgency index are completed. The device has the characteristics of small volume and self-contained analysis function, can perform real-time test and analysis, gives harmonic damage grades and is convenient for inspection personnel to use.
Claims (8)
1. A portable harmonic detector comprises a parameter sampling circuit, a data processing circuit, a communication circuit and a power supply circuit, and is characterized in that the parameter sampling circuit and the power supply circuit combine the electrical parameter sampling of an instrument and the power supply part of the device into a whole, and the power supply of the device is realized while voltage and current parameters are collected.
2. The portable harmonic detector of claim 1, wherein the data processing circuit uses a single chip microcomputer and peripheral circuits thereof to realize data acquisition and data interaction and storage with the power quality acquisition chip, so as to realize tight combination of parameter acquisition and calculation.
3. The portable harmonic detector according to claim 2, wherein the power quality acquisition chip part is a chip dedicated for power quality acquisition and used for harmonic analysis, and the chip interacts with the data of the single chip to acquire, calculate and store harmonic data.
4. The portable harmonic detector of claim 1, wherein the communication circuit comprises an RS485 communication interface and a WiFi module circuit.
5. A harmonic analysis method of a portable harmonic detector is characterized by comprising three parts of harmonic data classification, harmonic data calculation and harmonic data analysis.
6. The harmonic analysis method of claim 5, wherein the classification of the harmonic data is to classify the collected harmonic data into two types, namely static data and dynamic data, and each type of data is further divided into three parts, namely harmonic frequency, harmonic amplitude and harmonic power.
7. The harmonic analysis method of claim 5, wherein the harmonic data calculation is to classify the classified data in the same unit, the same time period and the same frequency period to obtain a data set for comparison.
8. The harmonic analysis method of claim 5, wherein the data analysis is performed by analyzing the data after the classification calculation according to a given analysis method to obtain an analysis result, and the result obtained by the analysis is a characteristic analysis result of the harmonic at the test point, and the method comprises: harmonic source type estimation, harmonic damage index and treatment urgency index.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866628A (en) * | 2021-11-19 | 2021-12-31 | 国网辽宁省电力有限公司鞍山供电公司 | Switch state analysis method based on current and voltage two-phase sequence comparison |
| CN114441865A (en) * | 2022-02-10 | 2022-05-06 | 北京为准智能科技有限公司 | Portable electromagnetic wave intensity distributed detection system based on smart phone |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866628A (en) * | 2021-11-19 | 2021-12-31 | 国网辽宁省电力有限公司鞍山供电公司 | Switch state analysis method based on current and voltage two-phase sequence comparison |
| CN113866628B (en) * | 2021-11-19 | 2023-12-19 | 国网辽宁省电力有限公司鞍山供电公司 | Switch state analysis method based on current and voltage double-phase sequence comparison |
| CN114441865A (en) * | 2022-02-10 | 2022-05-06 | 北京为准智能科技有限公司 | Portable electromagnetic wave intensity distributed detection system based on smart phone |
| CN114441865B (en) * | 2022-02-10 | 2022-08-05 | 北京为准智能科技有限公司 | Portable electromagnetic wave intensity distributed detection system based on smart phone |
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