CN201974477U - Detecting and analyzing device for harmonic waves of power system - Google Patents
Detecting and analyzing device for harmonic waves of power system Download PDFInfo
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- CN201974477U CN201974477U CN2010206221382U CN201020622138U CN201974477U CN 201974477 U CN201974477 U CN 201974477U CN 2010206221382 U CN2010206221382 U CN 2010206221382U CN 201020622138 U CN201020622138 U CN 201020622138U CN 201974477 U CN201974477 U CN 201974477U
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Abstract
The utility model discloses a detecting and analyzing device for harmonic waves of a power system, which consists of a power system data collection module, a high voltage transient spike collection module, a harmonic wave detecting and analyzing module, and a master control computer. Data communication between the modules and the master control computer is realized and mudbus protocol is actuated through an RS485 (recommended standard) interface. As a high speed data sampling and fast Fourier transform (FFT) technology, and a wavelet transform and wavelet packet transform technology are combined to implement measurement and high precision analysis on the harmonic waves of the power system, harmonic waves with frequency reaching 100kHz can be analyzed; therefore, the detecting and analyzing device for the harmonic waves of the power system solves the analyzing problems on the ultraharmonics in electrical energy quality management, and solves the application of wavelet and wavelet packet transform method in particular, and plays a very important role of detecting and analyzing noise signals like ultraharmonics, high frequency noises, spikes, etc.
Description
Technical field
The utility model discloses a kind of Harmonic Detection analytical equipment, a kind of power grid quality analytical equipment of electrical network user side is provided.
Background technology
Along with the fast development of Power Electronic Technique, increasing opertaing device, automation equipment require responsive to the quality of power supply, and are widely used in industrial and agricultural production and daily life.These have all proposed more and more higher requirement to the quality of power supply.Vast electricity consumption client is when paying close attention to the quality of power supply, in electric system, but increased a large amount of nonlinear loads, the industry ac-dc conversion device from low pressure low capacity household electrical appliance to high-voltage large-capacity, as static converter, because static converter is with on-off mode work, can cause power network current, voltage waveform distortion, produce the harmonic pollution of electrical network.In addition, impacts such as electric arc furnaces, heavy (merchant) mill, electric locomotive, undulatory property load in servicely not only can produce a large amount of higher hamonic waves, and makes voltage fluctuation, flickering, three-phase imbalance be on the rise.Not only these adverse effects can cause the security of electricity supply and use equipment to reduce, and can seriously undermine and disturb the safety and economic operation of electrical network, cause " public hazards " of electrical network, even cause protective relaying maloperation, metering misalignment and consumer electronics device damage.
Domestic harmonic wave research work started to walk in the eighties in last century, but it is because not enough to the harm understanding of harmonic wave, particularly the harm understanding to clutters such as high-frequency higher hamonic wave (as the higher hamonic wave more than 50 times), surge, high frequency noise, spikings is not enough, and the measure dynamics of taking is little.The widespread usage of big-power transducer, electronic rectifier, light modulator, Switching Power Supply is to producing new harmonic pollution on the electrical network, so power grid quality worsens day by day, and the safety of electrical network and consumer is brought serious harm, and what have causes the accident.Show that according to foreign study the ratio of the harmfulness of the harmfulness of high-frequency higher hamonic wave and low-frequency higher hamonic wave (as 3,5,7,9 subharmonic) is 9:1.Actual China mainly is at below 25 subharmonic to the research of electric network pollution, and still is blank substantially in the research of higher hamonic wave more than 50 times.At the detection and the improvement of clutters such as high-frequency higher hamonic wave (as the higher hamonic wave more than 50 times), surge, high frequency noise, spiking, almost there are not similar technology and product.
The utility model content
The purpose of this utility model is at above-mentioned deficiency of the prior art, provide a kind of and can satisfy the requirement that the user improves constantly the power quality analysis function, based on virtual instrument technique, computer technology and bus type automatic checkout system technology, can monitor the operation of power networks situation in real time, and the power quality analysis device that carries out sampling analysis at high frequency higher hamonic wave and voltage jump.
Realize above-mentioned functions, the utility model has adopted following technical scheme: a kind of Harmonic Detection analytical equipment, form by electric network data acquisition module, high pressure transient peak signal acquisition module, harmonic wave check and analysis module, main control computer, realize data communication by the RS485 interface between module and the main control computer, carry out the mudbus agreement.
Main control computer is realized man-machine conversation by keyboard, display screen, printer, and receives the real time data of each module by the RS485 interface, and sets up corresponding database for user inquiring.
The electric network data acquisition module comprises that by one sampling hold circuit, A/D change-over circuit and LED charactron show and the Single Chip Microcomputer (SCM) system of keypad input constitutes, consumer networks inserts the electric network data acquisition module by mutual inductor, and the electric network data acquisition module shows real-time power network parameter (comprising voltage, electric current, frequency) on LED.
High pressure transient peak signal acquisition module keeps module, A/D change-over circuit and Single Chip Microcomputer (SCM) system to form by voltage input sample end, sampling, described voltage input sample end adopts resistor voltage divider circuit, and input end adjunction building-out capacitor is to improve the ability of sampling transient signal.
Harmonic wave check and analysis module is by voltage input sample end, electric current input sample end, the signal condition module, A/D change-over circuit and Single Chip Microcomputer (SCM) system are formed, described voltage input sample end adopts electric resistance partial pressure and building-out capacitor circuit, electric current input sample end adopts the electric current pliers of corresponding wideband, voltage after the sampling, current signal is through conditioning, carry out analog to digital conversion and carry out digital signal Processing by high-speed a/d converter respectively by selector switch, harmonic wave check and analysis module is handled the high and low frequency part of signal respectively, for the radio-frequency component that comprises noise and unusual information, utilize small echo and wavelet package transforms to determine the generation moment and the amplitude of sign mutation point and high-frequency resonant; By FFT, determine the content of each harmonic for low-frequency component.
The utility model combines the high-speed data sampling with fast Fourier transform (FFT) technology, wavelet transformation and wavelet package transforms technology, mains by harmonics is measured and high accuracy analysis, can analyze harmonic wave up to 100kHz, solved in quality of power supply management problem analysis to higher hamonic wave, especially the application of small echo and wavelet package transforms method has been brought into play vital role for the detection and the analysis of noise signals such as higher hamonic wave, high frequency noise, spiking.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the structural representation of electric network data acquisition module.
Fig. 3 is the structural representation of high pressure transient peak signal acquisition module.
Fig. 4 is the structural representation of harmonic wave check and analysis module.
Embodiment
In order to make technological means of the present invention, creation characteristic, to reach purpose and effect is easy to understand,, further set forth the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, Harmonic Detection analytical equipment of the present utility model is made up of electric network data acquisition module, high pressure transient peak signal acquisition module, harmonic wave check and analysis module, main control computer, realize data communication by the RS485 interface between module and the main control computer, carry out the mudbus agreement.
As shown in Figure 2, the electric network data acquisition module comprises that by one sampling hold circuit, A/D change-over circuit and LED charactron show and the Single Chip Microcomputer (SCM) system of keypad input constitutes, consumer networks inserts the electric network data acquisition module by mutual inductor, the electric network data acquisition module shows real-time power network parameter (comprising voltage, electric current, frequency etc.) on LED, pass through keyboard, the electric network data acquisition module can be provided with spacing value, exceed spacing value in case the real-time grid parameter occurs, electric network data acquisition module output alarm signal.
As shown in Figure 3, high pressure transient peak signal acquisition module is made up of voltage input sample end, sampling hold circuit, A/D change-over circuit and Single Chip Microcomputer (SCM) system, voltage input sample end adopts resistor voltage divider circuit, input end adjunction building-out capacitor is to improve the ability of sampling transient signal, make equipment can collect the spiking of 2500V high pressure, 1 μ s, the change of height that again can detection of grid voltage.Voltage signal after the sampling is stored in the nonvolatile memory (as solid state hard disc, CF card etc.) after carrying out analog to digital conversion, and can be sent in the main control computer of automatic checkout system through sampling maintenance, A/D converter.
As shown in Figure 4, harmonic wave check and analysis module is made up of voltage input sample end, electric current input sample end, signal conditioning circuit, A/D change-over circuit and Single Chip Microcomputer (SCM) system, voltage input sample end adopts electric resistance partial pressure and building-out capacitor circuit, improved the bandwidth of sampled signal, helped spectrum analysis high-frequency signal; Electric current input sample end adopts the corresponding electric current pliers that reaches the wideband of 100kHz of frequency, and the voltage after the sampling, current signal carry out analog to digital conversion by high-speed a/d converter respectively by selector switch, and carry out digital signal Processing through conditioning.
Module adopts different wave filters that the high and low frequency of signal is partly separated, and handles respectively.For the radio-frequency component that comprises noise and unusual information, utilize small echo and wavelet package transforms, set up enough little time domain or frequency-domain analysis mathematical model, obtain best resolution, determine the generation moment of sign mutation point and high-frequency resonant then, and calculate the energy state of harmonic wave by the amplitude of resonance; For relative continuity preferably low-frequency component then by the FFT(fast fourier transform), determine the content of each harmonic.
The real-time sampling data of each module comprise that the data of harmonic wave check and analysis all deposit in the corresponding nonvolatile memory, and main control computer can receive the real time data of each module with instruction calls by the RS485 interface, and sets up corresponding database.RS485 interface band infrared ray optocoupler is isolated, and scurries into the antijamming capability of computing machine and raising system communication to prevent high pressure.Main control computer is realized man-machine conversation by keyboard, display screen, printer, and the operator can pass through keyboard input inquiry information, perhaps carries out data analysis.
More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (6)
1. Harmonic Detection analytical equipment, it is characterized in that, form by electric network data acquisition module, high pressure transient peak signal acquisition module, harmonic wave check and analysis module, main control computer, realize data communication by the RS485 interface between module and the main control computer, carry out the mudbus agreement.
2. Harmonic Detection analytical equipment according to claim 1, it is characterized in that, described main control computer is realized man-machine conversation by keyboard, display screen, printer, receives the real time data of each module by the RS485 interface, and sets up corresponding database for user inquiring.
3. Harmonic Detection analytical equipment according to claim 1, it is characterized in that, described electric network data acquisition module is made of a Single Chip Microcomputer (SCM) system that comprises digital display tube of sampling hold circuit, A/D change-over circuit and LED and keypad input, consumer networks inserts described electric network data acquisition module by mutual inductor, and described electric network data acquisition module shows the real-time power network parameter on LED.
4. Harmonic Detection analytical equipment according to claim 1, it is characterized in that, described high pressure transient peak signal acquisition module keeps module, A/D change-over circuit and Single Chip Microcomputer (SCM) system to form by voltage input sample end, sampling, described voltage input sample end adopts resistor voltage divider circuit, and input end adjunction building-out capacitor is to improve the ability of sampling transient signal.
5. Harmonic Detection analytical equipment according to claim 1, it is characterized in that, described harmonic wave check and analysis module is made up of voltage input sample end, electric current input sample end, signal condition module, A/D change-over circuit and Single Chip Microcomputer (SCM) system, described voltage input sample end adopts electric resistance partial pressure and building-out capacitor circuit, and electric current input sample end adopts the electric current pliers of corresponding wideband.
6. Harmonic Detection analytical equipment according to claim 1 is characterized in that, described RS485 interface band infrared ray optocoupler is isolated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206221382U CN201974477U (en) | 2010-11-24 | 2010-11-24 | Detecting and analyzing device for harmonic waves of power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206221382U CN201974477U (en) | 2010-11-24 | 2010-11-24 | Detecting and analyzing device for harmonic waves of power system |
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| CN201974477U true CN201974477U (en) | 2011-09-14 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305892A (en) * | 2011-07-13 | 2012-01-04 | 上海仪器仪表研究所 | Novel power grid harmonic detection analysis device |
| CN104360153A (en) * | 2014-10-22 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Method for detecting and analyzing harmonic waves of power grids in online manner |
| CN104764931A (en) * | 2015-01-27 | 2015-07-08 | 贵州大学 | Harmonic detection device based on DSP and detection method thereof |
| CN105044457A (en) * | 2015-06-30 | 2015-11-11 | 西安理工大学 | Anti-noise electric power system harmonic detection method |
| CN111398660A (en) * | 2020-04-09 | 2020-07-10 | 华北电力大学（保定） | Alternating current harmonic detection system based on converter transformer network side winding |
| CN114062761A (en) * | 2021-11-12 | 2022-02-18 | 国网河南省电力公司检修公司 | Transformer grounding wire AC/DC component detection device |
-
2010
- 2010-11-24 CN CN2010206221382U patent/CN201974477U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305892A (en) * | 2011-07-13 | 2012-01-04 | 上海仪器仪表研究所 | Novel power grid harmonic detection analysis device |
| CN104360153A (en) * | 2014-10-22 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Method for detecting and analyzing harmonic waves of power grids in online manner |
| CN104764931A (en) * | 2015-01-27 | 2015-07-08 | 贵州大学 | Harmonic detection device based on DSP and detection method thereof |
| CN104764931B (en) * | 2015-01-27 | 2017-06-23 | 贵州大学 | A kind of harmonic measurement device and its detection method based on DSP |
| CN105044457A (en) * | 2015-06-30 | 2015-11-11 | 西安理工大学 | Anti-noise electric power system harmonic detection method |
| CN105044457B (en) * | 2015-06-30 | 2018-02-23 | 西安理工大学 | A kind of antimierophonic trend of harmonic detection method of power |
| CN111398660A (en) * | 2020-04-09 | 2020-07-10 | 华北电力大学（保定） | Alternating current harmonic detection system based on converter transformer network side winding |
| CN114062761A (en) * | 2021-11-12 | 2022-02-18 | 国网河南省电力公司检修公司 | Transformer grounding wire AC/DC component detection device |
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Granted publication date: 20110914 Termination date: 20111124 |