CN111426876A - Harmonic monitoring device and harmonic monitoring system based on intelligent switch - Google Patents
Harmonic monitoring device and harmonic monitoring system based on intelligent switch Download PDFInfo
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- CN111426876A CN111426876A CN202010242154.7A CN202010242154A CN111426876A CN 111426876 A CN111426876 A CN 111426876A CN 202010242154 A CN202010242154 A CN 202010242154A CN 111426876 A CN111426876 A CN 111426876A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 74
- 238000012806 monitoring device Methods 0.000 title claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 41
- 238000012545 processing Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/17—Spectrum analysis; Fourier analysis with optical or acoustical auxiliary devices
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Abstract
The invention relates to a harmonic monitoring device, comprising: the current acquisition module is used for acquiring the current of the load; the harmonic wave monitoring module is connected with the current acquisition module; the harmonic monitoring module comprises a filtering unit and an alarm unit connected with the filtering unit in series, the filtering unit is used for filtering basic current of preset multiple in a branch where the filtering unit is located, and the alarm unit is used for giving an alarm when the current of the branch where the alarm unit is located is larger than the basic current of the preset multiple. The harmonic monitoring device and the harmonic monitoring system based on the intelligent switch can give an alarm when the load generates an excessive harmonic condition, so that the harmonic monitoring device and the harmonic monitoring system have an important guiding function on further prevention and improvement of the harmonic.
Description
Technical Field
The invention relates to the technical field of power quality harmonic detection, in particular to a harmonic monitoring device and a harmonic monitoring system based on an intelligent switch.
Background
With the rapid development of national economy and the development of smart grids, electric power plays an extremely important role in the industrial field and people's life, and whether the stable operation of an electric power system can be effectively guaranteed, the electric energy quality can be improved, and electric equipment and personal safety can be protected becomes a problem which people generally pay attention to. The monitoring of the power quality is also highly regarded by people, and along with the increasing of nonlinear loads in a power system, harmonic current is generated and injected into a power grid, so that the voltage waveform in the power grid is distorted, the harmonic pollution is further caused to the power grid, and the power quality is deteriorated. Therefore, the harmonic wave monitoring can further develop the power quality, and an accurate detection result has a significant guiding effect on the prevention and treatment of the harmonic wave. However, the monitoring system of the current power system cannot effectively monitor the harmonic waves in the power grid.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a harmonic monitoring device and a harmonic monitoring system based on an intelligent switch.
A harmonic monitoring device comprising:
the current acquisition module is used for acquiring the current of the load; and
the harmonic monitoring module is connected with the current acquisition module; the harmonic monitoring module comprises a filtering unit and an alarm unit connected with the filtering unit in series, the filtering unit is used for filtering basic current of preset multiple in a branch where the filtering unit is located, and the alarm unit is used for giving an alarm when the current of the branch where the alarm unit is located is larger than the basic current of the preset multiple.
In one embodiment, the number of the harmonic monitoring modules is multiple, and the harmonic monitoring modules are connected in parallel.
In one embodiment, when the harmonic monitoring device is used for monitoring odd harmonics, the filtering unit is a second-order filtering unit, and the preset multiple is 2.
In one embodiment, the filter unit comprises an inductor and a capacitor connected in series.
In one embodiment, the alarm unit comprises a light sensor and an alarm lamp which are connected in series, the alarm lamp is used for emitting light when the current of a branch in which the alarm lamp is located is larger than the basic current of the preset multiple, and the light sensor is used for triggering an alarm when the alarm lamp emits light.
In one embodiment, the current collection module comprises a current transformer.
In one embodiment, the current transformer is of the SCT254FK type.
In one embodiment, the harmonic monitoring device further comprises a protection resistor connected in parallel with the harmonic monitoring module.
A smart switch based harmonic monitoring system comprising:
the intelligent switch comprises an intelligent switch body and the harmonic wave monitoring device;
the harmonic monitoring feedback module is connected with the intelligent switch and is used for sending a trigger signal when the current detected by the harmonic monitoring device contains harmonics;
and the processing module is connected with the harmonic wave monitoring feedback module and used for sending alarm information after receiving the trigger signal.
In one embodiment, the processing module is in communication connection with the mobile terminal through a cloud server, the processing module sends the alarm information to the cloud server after receiving the trigger signal, and the mobile terminal acquires the alarm information through the cloud server.
Above-mentioned harmonic monitoring devices and harmonic monitoring system based on intelligence switch, the filtering unit is greater than the basic current of predetermineeing the multiple at the branch road filtering basic current that the filtering unit place, and the alarm unit sends out the police dispatch newspaper when the current of alarm unit place branch road is greater than the basic current of predetermineeing the multiple to can report to the police when the excessive situation of harmonic takes place to the load, thereby have important guide effect to further prevention and the improvement of harmonic.
Drawings
Fig. 1 is a block diagram of a harmonic monitoring apparatus in an embodiment.
Fig. 2 is a circuit diagram of a harmonic monitoring device in an embodiment.
Fig. 3 is a block diagram of an embodiment of an intelligent switch based harmonic monitoring system.
FIG. 4 is a system architecture diagram of an intelligent switch based harmonic monitoring system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a block diagram of a harmonic monitoring apparatus in an embodiment. As shown in fig. 1, the harmonic monitoring apparatus 100 includes a current collection module 110 and a harmonic monitoring module 120.
The current collecting module 110 is used for collecting the current of the load. The harmonic monitoring module 120 is connected to the current collecting module 110, and the harmonic monitoring module 120 includes a filtering unit 121 and an alarm unit 122 connected in series to the filtering unit 121. The filtering unit 121 is configured to filter a basic current of a preset multiple in a branch where the filtering unit 121 is located, and the alarm unit 122 is configured to send an alarm when a current of the branch where the alarm unit 122 is located is greater than the basic current of the preset multiple.
Specifically, the current collecting module 110 collects the current of the load and outputs the current to the harmonic monitoring module 120, the filtering unit 121 in the harmonic monitoring module 120 filters the current of the branch where the current is located, and the magnitude of the filtering current is a preset multiple of the basic current. The basic current is the normal working current of the load, and the size of the preset multiple can be set according to the actual requirement. When the filtering unit 121 does not completely filter the current of the branch where the filtering unit 121 is located, that is, the current of the branch where the filtering unit 121 is located is greater than the basic current of the preset multiple, the alarm unit 122 sends an alarm.
In the harmonic monitoring device 100, the filtering unit 121 filters the basic current of the preset multiple in the branch where the filtering unit 121 is located, so as to determine whether the current of the branch where the filtering unit 121 is located is the basic current of the preset multiple, and the alarm unit 122 gives an alarm when the current of the branch where the alarm unit 122 is located is greater than the basic current of the preset multiple, so that the alarm can be given when the harmonic excess condition occurs to the load, and therefore, an important guiding effect is provided for further prevention and improvement of the harmonic.
In one embodiment, the number of the harmonic monitoring modules 120 is multiple, and multiple harmonic monitoring modules are connected in parallel. The preset multiple may be set to be the same or different for the filtering units 121 in each harmonic monitoring module 120.
The following description specifically describes the harmonic monitoring apparatus 100 as an example for monitoring odd harmonics. In this embodiment, the filtering unit 121 is a second-order filtering unit, and the preset multiple is 2. Specifically, referring to fig. 2, the current collecting module 110 includes a current transformer CT, and the current transformer CT may be connected to the load so as to collect the current of the load. For example, the current transformer CT is a current transformer of SCT254FK type. The load can refer to electric equipment in the power system, and can also be a power grid and the like.
When the load current passes through the first harmonic monitoring module 120, the filtering unit 121 in the second harmonic monitoring module 120 filters twice the basic current, if the load current comprises a third harmonic, the alarm unit 122 in the first harmonic monitoring module 120 sends alarm information, if the load current passes through the second harmonic monitoring module 120, the filtering unit 121 in the second harmonic monitoring module 120 filters twice the basic current, if the load current comprises a fifth harmonic, the alarm unit 122 in the second harmonic monitoring module 120 sends alarm information, if the load current passes through the third harmonic monitoring module 120, the filtering unit 121 in the third harmonic monitoring module 120 filters twice the basic current, and if the load current comprises a seventh harmonic, the alarm unit 122 in the third harmonic monitoring module 120 sends alarm information.
Further, the alarm unit 122 includes a light sensor S and an alarm lamp L ED., an alarm lamp L ED connected in series for emitting light when the current of the branch where the alarm lamp L ED is located is greater than the base current of the preset multiple, and the light sensor S is used for triggering an alarm when the alarm lamp L ED emits light.
Optionally, the harmonic monitoring apparatus 100 further includes a protection resistor R connected in parallel with the harmonic monitoring module 120, so as to prevent the electrical components in the harmonic monitoring module 120 connected in parallel from being burned.
Fig. 3 is a block diagram of a harmonic monitoring system based on an intelligent switch (hereinafter referred to as a harmonic monitoring system) in an embodiment. As shown in fig. 3, the harmonic monitoring system 300 includes an intelligent switch 310, a harmonic monitoring feedback module 320, and a processing module 330.
Specifically, the smart switch 310 includes a smart switch body and the harmonic monitoring device 100 as in any of the above embodiments, the harmonic monitoring feedback module 320 is connected to the smart switch 310, and the harmonic monitoring feedback module 320 is configured to send out a trigger signal when the current detected by the harmonic monitoring device 100 includes a harmonic wave, and the harmonic monitoring feedback module 320 may correspondingly send out different trigger signals when the harmonic monitoring device 100 detects different harmonic waves.
In an embodiment, the harmonic monitoring system 300 may further include a switch monitoring unit 340 connected between the intelligent switch 310 and the processing module 330, where the switch monitoring unit 340 is configured to detect an operating state of the intelligent switch 310 and feed back the operating state of the intelligent switch 310 to the processing module 330, so that the processing module 330 may issue a corresponding prompt when the state of the intelligent switch 310 is abnormal. For example, the switch monitoring unit 340 may include at least one of a temperature monitoring sensor 341, a phase monitoring sensor 342, and a frequency detecting sensor 343.
In an embodiment, the harmonic monitoring system 300 may further include a voltage/current sampling module 350 and a signal conditioning module 360, wherein the voltage/current sampling module 350, the signal conditioning module 360, and the processing module 330 are connected in sequence. The voltage/current sampling module 350 is configured to collect voltage and current of the load, convert the collected voltage and current into digital values through the signal conditioning module 360, and transmit the digital values to the processing module 330, so as to guide a user in monitoring the operating state of the load.
In an embodiment, in conjunction with fig. 4, both the harmonic detection device 100 and the processing module 330 may be integrated in the smart switch 310, and the harmonic monitoring device 100 in the smart switch 310 is connected to the load 410 to monitor the harmonics in the load 410. The processing module 330 in the intelligent switch 310 is in communication connection with the mobile terminal 440 through the cloud server 430. For example, the processing module 330 in the smart switch 310 is communicatively connected to the cloud server 430 through the gateway 420 by using a wireless network, and the cloud server 430 may be communicatively connected to the mobile terminal 440 through the wireless network or a 2G, 3G, 4G, 5G network, or the like. The processing module 330 sends alarm information to the cloud server 430 after receiving the trigger signal sent by the harmonic monitoring feedback module 320, and the user acquires the alarm information through the cloud server by using the mobile terminal 440, so that the alarm is given when the excessive harmonic condition occurs in the load, and an important guiding function is provided for further preventing and improving the harmonic.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A harmonic monitoring device, comprising:
the current acquisition module is used for acquiring the current of the load; and
the harmonic monitoring module is connected with the current acquisition module; the harmonic monitoring module comprises a filtering unit and an alarm unit connected with the filtering unit in series, the filtering unit is used for filtering basic current of preset multiple in a branch where the filtering unit is located, and the alarm unit is used for giving an alarm when the current of the branch where the alarm unit is located is larger than the basic current of the preset multiple.
2. The harmonic monitoring device according to claim 1, wherein the number of the harmonic monitoring modules is plural, and plural harmonic monitoring modules are connected in parallel.
3. The harmonic monitoring device according to claim 2, wherein when the harmonic monitoring device is used for monitoring odd harmonics, the filtering unit is a second-order filtering unit, and the preset multiple is 2.
4. The harmonic monitoring device of claim 1 wherein the filtering unit comprises an inductor and a capacitor in series.
5. The harmonic monitoring device according to claim 1, wherein the alarm unit comprises a light sensor and an alarm lamp connected in series, the alarm lamp is configured to emit light when the current of the branch in which the alarm lamp is located is greater than the basic current of the preset multiple, and the light sensor is configured to trigger an alarm when the alarm lamp emits light.
6. The harmonic monitoring device of claim 1 wherein the current collection module comprises a current transformer.
7. The harmonic monitoring device of claim 6 wherein the current transformer is of the SCT254FK type.
8. The harmonic monitoring device of claim 1 further comprising a protection resistor in parallel with the harmonic monitoring module.
9. A harmonic monitoring system based on intelligent switches, comprising:
a smart switch comprising a smart switch body and the harmonic monitoring device of any one of claims 1 to 8;
the harmonic monitoring feedback module is connected with the intelligent switch and is used for sending a trigger signal when the current detected by the harmonic monitoring device contains harmonics;
and the processing module is connected with the harmonic wave monitoring feedback module and used for sending alarm information after receiving the trigger signal.
10. The harmonic monitoring system according to claim 9, wherein the processing module is in communication connection with a mobile terminal through a cloud server, the processing module sends the alarm information to the cloud server after receiving the trigger signal, and the mobile terminal obtains the alarm information through the cloud server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242154.7A CN111426876A (en) | 2020-03-31 | 2020-03-31 | Harmonic monitoring device and harmonic monitoring system based on intelligent switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010242154.7A CN111426876A (en) | 2020-03-31 | 2020-03-31 | Harmonic monitoring device and harmonic monitoring system based on intelligent switch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466553A (en) * | 2021-06-18 | 2021-10-01 | 国网宁夏电力有限公司电力科学研究院 | Harmonic monitoring system based on intelligent switch |
| US11313930B1 (en) | 2020-11-13 | 2022-04-26 | Rohde & Schwarz Gmbh & Co. Kg | Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060249A (en) * | 2007-06-06 | 2007-10-24 | 华中科技大学 | Hybrid power filter |
| CN202004457U (en) * | 2011-02-18 | 2011-10-05 | 湖南金丹电气有限公司 | Filtering cabinet |
| CN206401896U (en) * | 2017-01-16 | 2017-08-11 | 中冶华天南京电气工程技术有限公司 | A kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling |
| CN107276090A (en) * | 2017-07-07 | 2017-10-20 | 华中科技大学 | A kind of series hybrid active power filter |
| CN208350896U (en) * | 2018-06-26 | 2019-01-08 | 国网山西省电力公司电力科学研究院 | A kind of measuring device of harmonic wave |
-
2020
- 2020-03-31 CN CN202010242154.7A patent/CN111426876A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060249A (en) * | 2007-06-06 | 2007-10-24 | 华中科技大学 | Hybrid power filter |
| CN202004457U (en) * | 2011-02-18 | 2011-10-05 | 湖南金丹电气有限公司 | Filtering cabinet |
| CN206401896U (en) * | 2017-01-16 | 2017-08-11 | 中冶华天南京电气工程技术有限公司 | A kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling |
| CN107276090A (en) * | 2017-07-07 | 2017-10-20 | 华中科技大学 | A kind of series hybrid active power filter |
| CN208350896U (en) * | 2018-06-26 | 2019-01-08 | 国网山西省电力公司电力科学研究院 | A kind of measuring device of harmonic wave |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11313930B1 (en) | 2020-11-13 | 2022-04-26 | Rohde & Schwarz Gmbh & Co. Kg | Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors |
| CN113466553A (en) * | 2021-06-18 | 2021-10-01 | 国网宁夏电力有限公司电力科学研究院 | Harmonic monitoring system based on intelligent switch |
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