CN107707106B - Resolution device for harmonic invasion in power standard detection - Google Patents
Resolution device for harmonic invasion in power standard detection Download PDFInfo
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- CN107707106B CN107707106B CN201711070413.7A CN201711070413A CN107707106B CN 107707106 B CN107707106 B CN 107707106B CN 201711070413 A CN201711070413 A CN 201711070413A CN 107707106 B CN107707106 B CN 107707106B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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Abstract
The invention discloses a device for eliminating harmonic invasion based on power standard detection, which comprises an alternating current lead-in wire, a ballast and a fluorescent lamp, wherein the ballast and the fluorescent lamp are connected with the alternating current lead-in wire; the electric appliance capable of generating harmonic source is plugged in the load switching power supply board. According to the invention, by the principle, the higher harmonic and the internal harmonic of the external boundary of the standard measuring chamber are greatly reduced, and the reliability and the accuracy of standard verification are improved.
Description
Technical Field
The invention relates to the field of electric power, in particular to a resolution device for harmonic invasion in electric power standard detection.
Background
The relay protection, the gas chromatography, the high-voltage signal generator and the like used in the power network all have standard facilities and need regular verification, emergency sampling test and the like even under the fault condition, and the verification and detection work is carried out under the frequency of 50 Hz. As equipment such as a steel furnace, an electric locomotive and the like operates outside, the sine wave of the power grid is distorted, serious harmonic interference is generated, and the monitoring meter and even the standard calibration are greatly influenced. Particularly, it is important to pay attention to that in a standard detection chamber, not only external harmonic waves invade, but also a plurality of places where harmonic wave sources are generated bring great interference to the calibration work of the instrument and meter. Fig. 2 shows an ac power supply structure in which, in a commercial power inlet line 1, both power is introduced and, if there is a harmonic amount outside, the power is transmitted to a standard detection chamber without any precaution. As known to people, a standard detection room is like all offices, a fluorescent lamp 3 is installed on the ceiling, a ballast 2 is needed when the fluorescent lamp is started, the ballast works by electromagnetic conversion and triggering, and is a harmonic source.
Except for fluorescent lamps, a desk lamp is rarely used, the bulb of the existing desk lamp has eight flowers, especially the LED lamp which is proposed in recent years, although energy is saved and the service life is long, because the technology processing such as voltage reduction, rectification and the like is accompanied, a serious harmonic pollution source is formed, each person can do simple experiments, a mobile phone which is carried along with the person is turned on, a photographing key is clicked, and a lens is aligned with the turned-on LED lamp, so that the photoelectric burr shape shown in figure 3 can be seen and photographed on the screen of the mobile phone, the noise waves emitted by the LED lamp not only flicker but also radiate, therefore, the related aspects of the technology are proposed to be careful by users, and particularly middle and primary school students are not suitable to adopt the bulb, otherwise, firstly, the technology has great clear harm to eyes, secondly, has no influence on the brain and other parts, and is further detected and examined.
Similarly, in our power system, especially in the standard detection room, if a series of products such as LED table lamps are used, a harmonic source is also introduced. In addition to lighting, the detection chamber must be equipped with a constant temperature system that will generate load shock waves when it is started and stopped, and the generation of harmonic content if an inverter air conditioner or the like is introduced.
In summary, from outside to inside, there are a lot of harmonic sources that attack the standard detection chamber, how to avoid and prevent harmonic interference, and ensure the accuracy and reliability of the instrument calibration work, which is a significant problem that is not negligible.
Disclosure of Invention
The invention aims to solve the technical problem of eliminating an external harmonic source and an internal harmonic source of a standard detection chamber, and aims to provide a device for eliminating harmonic invasion in power standard detection, so that the external harmonic amount and the internal harmonic amount of the detection chamber are greatly reduced, and the reliability and the accuracy of standard verification are improved.
The invention is realized by the following technical scheme:
the elimination device based on harmonic invasion in power standard detection comprises an alternating current lead-in wire, a ballast and a fluorescent lamp, wherein the ballast and the fluorescent lamp are connected with the alternating current lead-in wire; the electric appliance capable of generating harmonic source is plugged on the load switching power supply board.
In the scheme, in order to avoid the influence of internal and external harmonic waves and enhance the anti-interference capability, on the basis of the existing single socket, a load switching power panel is adopted, an input power supply is subjected to expanded branching, and electrical appliances which can generate harmonic sources such as illumination, an air conditioner and the like are plugged on the load switching power panel; then, a specially designed harmonic elimination filter and a filter plug-in wire are also plugged on the load transfer power panel, high and low frequency harmonics are eliminated through the processing of an internal circuit, and a relatively pure 50Hz power frequency power supply is output on a self-contained filter output power socket; and then, a working power supply without harmonic interference is introduced by utilizing the standard measurement extended power panel and the plug-in wires thereof, and the detection signal instrument, the standard instrument and the detected instrument are plugged into the standard measurement extended power panel, so that the standard measurement extended power panel can smoothly carry out verification work.
The scheme separates a power supply system and a power utilization system which contain harmonic sources and eliminate harmonic influence by the structural transformation of the branches of the power supply plate and the additional filter, so that the standard measurement plate has no harmonic pollution, and the accuracy and the reliability of the detection of the instrument and the meter are ensured.
The passive filter is mainly composed of an inductor and a capacitor, and has the advantages of low manufacturing cost, easily purchased devices, convenient installation and use, and the defects of narrow frequency band range, low impedance of a resonance point and the need of configuring a plurality of systems for complex filtering requirements. The resonance elimination filter is a passive filter.
Preferably, the passive filter is a series type passive filter.
Preferably, the harmonic elimination filter comprises a filter inductor L, a filter capacitor C, a load R1, an inductor trimmer I and a capacitor trimmer C, the filter inductor L, the filter capacitor C and the load R1 are sequentially connected in series between a live line and a zero line of a 220V alternating voltage input end Ui, two ends of the load R1 are also connected with a live line and a zero line of a voltage output end Uout, the inductor trimmer L is connected in parallel with two ends of the filter inductor L, and the capacitor trimmer C is connected in parallel with two ends of the filter capacitor C. When 220V alternating voltage is input from the Ui end, the inside contains higher harmonics which are carried in from the outside and harmonic quantity generated by a standard room lamp source and a constant temperature system, and normal power frequency voltage is output from the Uout end through the filtering of an LC element and is used for detecting by a following instrument, so that the interference of the harmonics is reduced, and the reliability and the accuracy of standard verification are improved.
Preferably, the electric appliances capable of generating a harmonic source include an air conditioner and a table lamp. Harmonic source devices such as fluorescent lamps and LED lamps are not used in the measuring room as much as possible, harmonic generation is radically reduced, incandescent lamps or energy-saving lamps are preferably adopted in lighting, stroboscopic phenomenon is basically avoided, harmonic interference is further reduced, and reliability and accuracy of standard verification are improved.
Preferably, the verification detection power supply comprises a detection signal instrument, a standard instrument and a detected instrument.
Preferably, the value of the filter inductance L is 100 mH.
Preferably, the filter capacitor C has a value of 100 μ f.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention separates the power supply system and the power system containing harmonic source and eliminating the harmonic influence by the branch of the power supply plate and the structural improvement of the additional filter, so that the standard measuring plate has no harmonic pollution, and the accuracy and the reliability of the detection of the instrument and the meter are ensured.
2. The invention is provided with the harmonic elimination filter for eliminating high and low frequency harmonic waves, and outputs a pure 50Hz power frequency power supply on the output power socket of the filter, so that the standard measuring plate has no harmonic pollution, and the accuracy and the reliability of the detection of the instrument meter are ensured.
3. The invention adopts the filtering function of the LC inductance and capacitance connected in series, avoids the mutual interference of filters with different frequencies and has better filtering effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram of a conventional power utilization structure;
FIG. 3 is a diagram of the shape of an LED clutter;
fig. 4 is a circuit diagram of a detuning filter.
Reference numbers and corresponding part names in the drawings:
1. an AC inlet wire; 2. a ballast; 3. a fluorescent lamp; 4. a power switch; 5. a power outlet socket; 6. bulb, 7 bulb holder, 8, burr and scintillation clutter; 9. a load transfer power panel; 10. an air conditioner; 11. a desk lamp; 12. the original input line power socket; 13. a load power panel patch cord; 14. a filter patch cord; 15. a resonance elimination filter; 16. a filter output power socket; 17. a standard measurement extension power panel; 18. detecting a signal instrument; 19. a standard instrument; 20. and (5) detecting the instrument.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in fig. 1-4, the invention includes a device for eliminating harmonic invasion in electric power standard detection, comprising an ac lead-in wire 1, a ballast 2 and a fluorescent lamp 3 connected with the ac lead-out wire 1, wherein the ac lead-in wire 1 is further connected with an original input wire power socket 12, a load power board plug-in wire 13 on a load transfer power board 9 is plugged on the original input wire power socket 12, a filter plug-in wire 14 on a filter plug-in board is plugged on the load transfer power board 9, a harmonic elimination filter 15 is further arranged on the filter plug-in board, a standard measurement extension power board 17 is plugged on a filter output power socket 16 on the filter plug-in board, and a check detection power supply is plugged on the standard measurement extension power board 17; the electric appliances capable of generating harmonic sources are plugged on the load transfer power panel 9.
The working principle of the scheme is as follows: after the specially designed harmonic elimination filter is installed at the position of 14-15, the extension power panel 17 of the standard detection load is plugged into the filter output power socket 16 on the filter plug board, and the power lines of the signal instrument 18, the standard instrument 19 and the calibrated instrument 20 are plugged into the standard measurement extension power panel 17. After connection, the power supply facility is started for verification, the detection signal instrument 18 sends the same detection signal to the standard instrument 19 and the detected instrument 20, the two instruments carry out comparison test, verification data is recorded, an error value is obtained through calculation, whether the instrument to be verified works normally or not is judged, and a conclusion whether the instrument to be verified works normally or not is made.
As shown in fig. 3, in the present state of photoelectric burrs, 6 is a bulb composed of a plurality of LED light emitting diodes, 7 is a bulb holder, and 8 is burrs and flickering noise emitted from LEDs. The clutter emitted by the LED lamp not only has burr twinkling, but also has radiation, so that the user has cautions in the relevant aspect, and particularly middle and primary school students are not suitable for adopting the bulb, otherwise, the first definition has great harm to eyes, and the second definition has no influence on brain and other parts, and further detection and examination are carried out.
Similarly, in our power system, especially in the standard detection room, if a series of products such as LED table lamps are used, a harmonic source is also introduced. In addition to lighting, the measurement room must be equipped with a constant temperature system that will generate load shock waves when it is started and stopped, and with the introduction of variable frequency air conditioners and the like, the generation of harmonic waves is also accompanied.
In the scheme, in order to avoid the influence of internal and external harmonic waves and enhance the anti-interference capability, on the basis of the single socket 5 in the figure 2, a load switching power panel 9 in the figure 1 is adopted, an input power supply is subjected to expanded branching, and electrical appliances which can generate harmonic sources such as lighting, air conditioners and the like are plugged on the load switching power panel 9; then, a specially designed harmonic elimination filter 15 and a filter plug-in wire 14 are also plugged in the load transfer power panel 9, high-frequency and low-frequency harmonics are eliminated through internal circuit processing, and a pure 50Hz power frequency power supply is output on a filter output power socket 16; and then, a working power supply without harmonic interference is introduced by using the standard measurement extended power panel and the plug-in wires thereof, and the detection signal instrument 18, the standard measurement instrument 19 and the detected instrument 20 are plugged into the 17 standard measurement extended power panel to smoothly carry out verification work.
The scheme separates a power supply system and a power utilization system which contain harmonic sources and eliminate harmonic influence through the structural transformation of the branches of the power supply plate and the additional filter, so that the standard measurement plate has no harmonic pollution, is more pure, and ensures the accuracy and the reliability of the detection of the instrument and the meter.
Example 2:
the present embodiment is preferably as follows based on embodiment 1: the passive filter is mainly composed of an inductor and a capacitor, and has the advantages of low manufacturing cost, easily purchased devices, convenient installation and use, and the defects of narrow frequency band range, low impedance of a resonance point and the need of configuring a plurality of systems for complex filtering requirements. Therefore, the detuning filter 15 is selected to be a passive filter, since the patent only needs 50Hz to pass and other noise is filtered out, i.e. it is sufficient to implement a set of band-pass.
Passive filters can be divided into parallel filters and series filters. The parallel filter needs to set different components for harmonic waves of different section positions to complete filtering in sections, the filters with different frequencies can interfere with each other, and due to the difference of impedance, when certain frequency bands are filtered out, other frequencies are amplified, which is unfavorable for harmonic elimination, while the series filter has a much smaller contradiction, so the passive filter in the scheme is selected as the series passive filter.
As shown in fig. 4, the harmonic elimination filter 15 includes a filter inductor L, a filter capacitor C, a load R1, an inductor trimmer I, and a capacitor trimmer C, the filter inductor L, the filter capacitor C, and the load R1 are sequentially connected in series between the live line and the zero line of the 220V ac voltage input end Ui, the live line and the zero line of the voltage output end Uout are further connected to both ends of the load R1, the inductor trimmer L is connected in parallel to both ends of the filter inductor L, and the capacitor trimmer C is connected in parallel to both ends of the filter capacitor C.
The LC series filter is formed by an inductor and a capacitor connected in series and connected in series between the power supply and the load, so the "series" of the series filter has a double meaning: the first is to show that the inductor is connected with the capacitor in series, and the second is to show that the inductor is connected in series in a circuit for use. When 220V alternating voltage is input from the Ui end, the inside contains higher harmonics which are carried in from the outside and harmonic quantity generated by a standard room lamp source and a constant temperature system, and normal power frequency voltage is output from the Uout end through the filtering of an LC element and is used for detecting by a following instrument, so that the interference of the harmonics is reduced, and the reliability and the accuracy of standard verification are improved.
The frequency required to pass in the scheme is 50Hz power frequency, and the impedance of the selected inductance and capacitance elements is preferably controlled within a range of dozens of ohms, so that the power frequency can pass, and the effect of blocking other harmonic frequencies can be exerted.
Electric appliances capable of generating a harmonic source include an air conditioner 10 and a table lamp 11. Harmonic source devices such as fluorescent lamps and LED lamps are not used in the measuring room as much as possible, harmonic generation is radically reduced, incandescent lamps or energy-saving lamps are preferably adopted in lighting, stroboscopic phenomenon is basically avoided, harmonic interference is further reduced, and reliability and accuracy of standard verification are improved.
The verification detection power supply comprises a detection signal instrument 18, a standard instrument 19 and a detected instrument 20.
Example 3:
the present embodiment is preferably as follows on the basis of the above-described embodiment: the frequency required to pass in the scheme is 50Hz power frequency, and the impedance of the selected inductance and capacitance elements is preferably controlled within a range of dozens of ohms, so that the power frequency can pass, and the effect of blocking other harmonic frequencies can be exerted. If the value of the filter inductance L is 100mH, the 5A-level inductor is selected to work. The calculation formula according to the inductive reactance Xl is as follows:
Xl＝2лfL
＝2×3.14×50×100×10-3
＝31400×10-3
＝31(Ω)；
according to the formula, the inductance value is larger and the inductance value is higher when the inductance value is larger when the inductance value X1 is changed after the frequency is fixed, but the value of the metering harmonic wave has a certain range, the normal use of the original electric appliance can be influenced by the overlarge inductance, the effect of filtering the harmonic wave cannot be achieved by the undersize inductance, and the value of the filter inductance L selected by the scheme is determined to be 100mH through multiple times of test comparison.
According to the calculation formula of the inductive reactance X1, the change of the inductive reactance Xl is that the higher the frequency is, the higher the Xl is, and conversely, the lower the frequency is, the lower the Xl is, so that the harmonic resistance to the higher frequency is stronger after the inductor is selected, and the harmonic elimination effect is better. But the resistance to interference below 50Hz is increasingly poor, so that the people still need to take another remedial measure, namely, to serially connect a filter capacitor.
The value of the filter capacitance C is taken to be 100 μ f in this solution. The calculation formula according to the capacitive reactance Xc is as follows:
Xc＝1/2лfc
＝1÷(2×3.14×50×100×10-6)
＝1÷(31400×10-6)
＝1÷0.314
＝32(Ω)；
after the 50Hz frequency is determined, the capacitance C, namely the value of the obtained capacitive reactance, needs to be considered comprehensively, the normal use of the original electric appliance can be influenced by the overlarge capacitive reactance, the harmonic filtering effect can not be achieved by the undersize capacitive reactance, and 100 muf is selected through multiple tests. According to the formula, the capacitive reactance Xc changes in such a way that the higher the frequency is, the lower the Xc is, and conversely, the lower the frequency is, the higher the Xc is, so that the capacitor has stronger resistance to low-order harmonics and even direct-current components, and is complementary to the inductance action, and the capacitive reactance Xc and the inductance component are connected in series to realize better filtering effect.
Inductance L is 100mH, electric capacity C is 100 mu f, filter impedance value Z, because the series connection, so I add the main body inductance Xl that sets up and the capacitive reactance Xc, just obtained total newly-increased filter impedance value Z, promptly:
Z＝Xl+Xc＝31+32＝63(Ω)；
it can be seen that 50Hz frequency impedance is not large, so the power frequency is easy to pass, and other harmonic frequencies are high in inductive resistance and low in capacitive limitation according to the structural and functional characteristics of inductive resistance and capacitive resistance, so that a good band-pass effect is obtained.
Finally, in figure 4, beside the main inductor L and the main capacitor C, there are attached in parallel a variable inductor L and a variable capacitor C, which are incorporated in the circuit in the magnitude of 10% of the main component L, C as a function of the fine-tunable parameters, which is more advantageous for improving the selection effect of the band-pass filter.
According to the inductance, the capacitance and the impedance calculation formula, in practical operation, if the impedance Z needs to be increased, the adjustment of the inductance l is mainly performed, and the adjustment of the capacitance c is mainly performed when the impedance Z needs to be reduced; the selection of specific l and c values can be carried out in observation and monitoring by combining with measurement and display instruments such as a frequency meter, an oscilloscope and the like until the measurement and display instruments are satisfied, and then the determination is carried out.
In addition, in the scheme, because the voltage resistance of the capacitor has a fixed grade, the power standard detection is to work in a 220V voltage system, two power capacitors with the rated voltages of 230V and 400V can be selected, and for safety, a margin is required to be reserved, so that the 400V capacitor is selected to work.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The device for eliminating harmonic invasion based on power standard detection comprises an alternating current lead-in wire (1), a ballast (2) and a fluorescent lamp (3), wherein the ballast (2) and the fluorescent lamp (3) are connected with the alternating current lead-in wire (1), the alternating current lead-in wire (1) is further connected with an original input wire power socket (12), a load power board plug-in wire (13) on a load transfer power board (9) is plugged on the original input wire power socket (12), a filter plug-in wire (14) on the filter plug-in board is plugged on the load transfer power board (9), a harmonic elimination filter (15) is further arranged on the filter plug-in board, a standard measurement extended power board (17) is plugged on a filter output power socket (16) on the filter plug-in board, and a verification detection power supply is plugged on the standard measurement extended power board (17); the electric appliance capable of generating harmonic source is plugged on the load switching power supply board (9).
2. The device for eliminating harmonic attacks in the power standard detection according to claim 1, wherein the detuning filter (15) is a passive filter.
3. The elimination apparatus for harmonic invasion in power standard detection according to claim 2, wherein the passive filter is a series passive filter.
4. The elimination device based on harmonic invasion in power standard detection according to claim 3, characterized in that the harmonic elimination filter (11) comprises a filter inductor L, a filter capacitor C, a load R1, an inductor trimmer I and a capacitor trimmer C, wherein the filter inductor L, the filter capacitor C and the load R1 are connected in series between the live line and the zero line of the 220V alternating voltage input end Ui in sequence, the live line and the zero line of the voltage output end Uout are also connected at two ends of the load R1, the inductor trimmer L is connected in parallel at two ends of the filter inductor L, and the capacitor trimmer C is connected in parallel at two ends of the filter capacitor C.
5. The elimination apparatus for harmonic invasion based on power standard detection according to claim 1, wherein the electric appliances capable of generating harmonic sources comprise an air conditioner (10) and a desk lamp (11).
6. The elimination device based on harmonic invasion in power standard detection of claim 1, wherein the verification detection power supply comprises a detection signal instrument (18), a standard instrument (19) and a detected instrument (20).
7. The elimination apparatus based on harmonic invasion in power standard detection according to claim 4, wherein the value of the filter inductance L is 100 mH.
8. The elimination apparatus for harmonic invasion in power standard detection according to claim 4, wherein the value of the filter capacitor C is 100 μ f.
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| US20150035467A1 (en) * | 2005-06-17 | 2015-02-05 | Ctm Magnetics, Inc. | Permanent magnet inductor filter apparatus and method of use thereof |
| CN2930007Y (en) * | 2006-07-08 | 2007-08-01 | 董学娟 | Harmonic suppression power socket |
| CN201247867Y (en) * | 2008-04-07 | 2009-05-27 | 张方 | Environment protection energy-saving type filtering power socket |
| CN201352653Y (en) * | 2008-11-05 | 2009-11-25 | 夏勇军 | Power saving socket |
| CN202872066U (en) * | 2012-11-15 | 2013-04-10 | 浙江工业大学 | Combined type terminal plate |
| CN203273749U (en) * | 2013-06-19 | 2013-11-06 | 梅达平 | Fluorescent lamp bracket with power supply switch and socket |
| CN103516397B (en) * | 2013-09-17 | 2016-05-04 | 深圳市共进电子股份有限公司 | A kind of signal of telecommunication separation method and system based on power line carrier |
| CN103746381A (en) * | 2013-12-27 | 2014-04-23 | 华中科技大学 | Hybrid passive power filter |
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| WO2012130004A1 (en) * | 2011-03-28 | 2012-10-04 | 荣信电力电子股份有限公司 | Device for eliminating voltage harmonics in power system |
| KR20140148265A (en) * | 2013-06-22 | 2014-12-31 | 주식회사 세빅코리아 | a power saving equipment having function of reducting high harmonics and blocking standby power |
| CN104253465A (en) * | 2013-06-28 | 2014-12-31 | 比亚迪股份有限公司 | Electric vehicle and charging control system thereof |
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