CN201548635U - Monitoring device for pollution source of power quality - Google Patents
Monitoring device for pollution source of power quality Download PDFInfo
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- CN201548635U CN201548635U CN2009202713008U CN200920271300U CN201548635U CN 201548635 U CN201548635 U CN 201548635U CN 2009202713008 U CN2009202713008 U CN 2009202713008U CN 200920271300 U CN200920271300 U CN 200920271300U CN 201548635 U CN201548635 U CN 201548635U
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Abstract
The utility model relates to a monitoring device, in particular to a monitoring device for a pollution source of power quality, the structural key points of which lie in that the monitoring device comprises a signal acquisition device, a signal processing module, a first storage device and a second storage device, wherein an output end of the signal acquisition device is connected with the first storage device; and the signal processing module comprises a harmonic analysis processing device, a flickering analysis processing device and a voltage swell and dip processing device, receives signals of the first storage device for processing and analyzing, and leads the processed result to be stored into the second storage device. The monitoring device is characterized by realizing online orientating function of the pollution source of power quality for the first time, providing effective centralized processing for a power supply system, avoiding pollution signals from being spread within a large scope, improving the power supply quality of a power grid, providing unified standard and theoretical foundation for the method of solving the pollution source of power quality, and having important significance for the technical development of monitoring and orientating the pollution source of the power grid.
Description
Technical field
The utility model relates to the monitoring device of a kind of monitoring device, particularly a kind of pollution sources of electrical energy quality.
Background technology
Along with the application of a large amount of non-linear power electric components and the appearance of nonlinear-load, disturb more and more from the user side feedthrough system such as waveforms such as voltage interruption, impact in short-term, flickering and traps, the normal operation of electric system is caused interference.In addition, various faults and oscillatory occurences that insulator arc-over that thunderbolt causes or discharge, power system device cause all may be brought out power system accident, cause the temporary transient interruption of power supply, reduce power supply reliability.
The quality of power supply is bad multiple situation, and the user also has nothing in common with each other to the sensitivity of the quality of power supply, and along with the variation of various consumers to quality of power supply susceptibility, the scope of the quality of power supply further enlarges, and it is thinner to classify, and requires higher.The limit value of present most qualities of power supply is independent at voltage or electric current, is mainly used to assess certain power supply node quality of power supply grade in certain time period of electric power system.Yet, monitor power quality index merely and only provided a plurality of summations that influence that meet electrical network, can not point out the source that the quality of power supply is polluted, can not instruct the optimum of determining the quality of power supply to administer the place.
An important indicator---the flickering of the quality of power supply, it is meant that voltage fluctuation hinders the normal operation that is connected other electric equipments on the points of common connection, that is: the parameter generating period variation of loading when high capacity, will cause node voltage fluctuation or flickering, and in electric power system, propagate, influence the normal operation of other loads.Because points of common connection often is connected with a plurality of power loads, monitors the order of severity that individual node voltage can only be assessed voltage fluctuation or flickering merely, can not judge the source that flickering is disturbed.The flickering model that adopts in the current research work is followed the relevant criterion of IEC substantially, think that flickering is because the amplitude modulated making of voltage rises, so the flickermeter that uses is all followed the agreement of which amplitude modulation at present, but in the running environment that exists flickering to disturb, the electric current of constant duty also fluctuates, and the flickering that a subharmonic and a harmonic wave cause, the flickering that the harmonic voltage modulation produces also exists, therefore refine location feature from the voltage magnitude modulation pattern merely, it is not enough calculating flickering intensity.
The voltage swells rapid drawdown is less appearance in electrical network, but harm is bigger.Along with computing machine, the application of extensive susceptibility power electronic devices such as adjustable speed driver in the control robotization, only voltage swells that continues 1/tens seconds or the rapid drawdown interruption that all may cause producing, cause enormous economic loss, the voltage swells rapid drawdown is considered to influence the most serious transient power quality problem of the normal operation of subscriber equipment.But because the voltage swells rapid drawdown duration is short, unpredictable, so its orientation difficult problem in the engineering always.
Traditional monitoring to the quality of power supply mainly is the monitoring at harmonic pollution source, mainly uses critical impedance method and power flow direction method, and the critical impedance method is through theory hypothesis, is difficult to obtain actual parameter, is not easy to online application, does not have practical value.What often use now is the power flow direction method, it is based on the hypothesis of " pollution source are outside conveying capacities ", and in fact, in the multi resonant wave source supply network of complexity, the simple consumption of linear load and can not inject harmonic power, but harmonic source might absorb harmonic power, and " failing to judge " situation just takes place easily for this, therefore can not use " whether injecting harmonic power to network " basis for estimation as harmonic source.
The utility model content
But the purpose of this utility model is to provide according to the deficiencies in the prior art part monitoring device of the pollution sources of electrical energy quality of various pollution source in a kind of comprehensive monitoring electrical network.
The utility model is realized by following approach:
The monitoring device of pollution sources of electrical energy quality, its structural feature is, include signal pickup assembly, signal processing module, first memory storage and second memory storage, the output terminal of signal pickup assembly connects first memory storage, signal processing module includes frequency analysis treating apparatus, flickering APU and voltage swells rapid drawdown treating apparatus, it receives the signal of first memory storage, carry out analyzing and processing after, result is stored in second memory storage.
Signal pickup assembly is gathered the voltage and current waveform signal in the electrical network in real time, and this waveform signal stored in first memory storage as raw data, the voltage and current data-signal of each circuit that signal processing module is then gathered according to signal pickup assembly, calculate and analyze, obtain the related data of pollution source at last, store in second memory storage.
Monitoring device under the utility model is from the Conjoint Analysis of two electrical network important parameters of voltage and current, monitoring and directed various pollution source, avoided utilizing merely in the prior art voltage to carry out the defective of identification pollution source, seek various pollution source comprehensively and effectively, and monitor in real time and orientation, has good online application power, can determine the position of pollution source, focus on thereby can provide effectively, avoid polluting the propagation on a large scale of signal, improved grid supply quality, the basis of unified standard and theory is provided for the settling mode of the various pollution source of electrical network, pollution source monitoring and directed technical development to electrical network have great significance, and administer the electric energy pollution source for electric power system good basis is provided.
The utility model can further be specially:
Signal pickup assembly includes analog-digital commutator, frequency overlapped-resistable filter and programmable digital collector, and is connected in series in regular turn.
Analog-digital commutator is for conversion into digital signal with the waveform signal of electric current and voltage through high precision, carries out filtering via frequency overlapped-resistable filter then, carries out the high-speed real-time collection by the programmable digital collector at last.Data after the collection can stick into line data exchange by usb data bus and Industry Control, are sent to carry out real-time analysis in the signal processing module and handle the system centre that the result that real-time analysis is handled can upload by Ethernet interface.
Analog-digital commutator can be selected A/D conversion chip AD7656, the FPGA singlechip chip that frequency overlapped-resistable filter and programmable digital collector can select ALTERA company to produce, and model is EP1K30QC208.
First memory storage can adopt the dual port RAM chip, and model is CY7C025.
The work schedule of AD7656 is provided by fpga chip EP1K30QC208, and behind the A/D EOC, FPGA reads transformation result, and transformation result is stored into dual port RAM.
The model that signal processing module can select Ti company to produce is the DSP process chip of TMS320VC33.
Second memory storage is with first memory storage, and employing can be adopted the dual port RAM chip, and model is CY7C025.
In addition, second memory storage also includes growth data memory storage and program storage device.
Be specially the ram space of growth data and the FLASH of procedure stores.
System can also provide a kind of auxiliary administration module:
Form the system supplymentary administration module by ARM9 processor and CF card.ARM9CPU is based on a LPC2292 microcontroller of supporting 16/32 of real-time simulation and embedded tracking, has the high speed Flash storer that 256KB embeds.
Three APUs of signal processing module can further be specially:
Voltage swells rapid drawdown APU analyzing and processing is as follows: the voltage and current data-signal of each passage of gathering according to signal pickup assembly;
Based on the wavelet transformation in cycle, extract the voltage magnitude change curve;
Whether the floating voltage amplitude surpasses 10% of setting value in the setting-up time that continues;
If voltage magnitude surpasses setting value in setting-up time, then calculate the electric current on the circuit of every on the bus in the corresponding region, and extract the current amplitude change curve based on the wavelet transformation in cycle;
Contrast potential amplitude change curve and current amplitude change curve, if the two lifting simultaneously, then this circuit is that non-voltage swells rapid drawdown is polluted, if the two is one rise and one drop, then this circuit is voltage swells rapid drawdown pollution source.
Analysis and processing procedure and result are stored in second memory storage into the basic value of handling as pollution source.
Duration of voltage collapse is short, and time of origin randomness is big, traditional Fourier transform, short time discrete Fourier transform time window are long, and time domain is differentiated rate variance, to powerless such as the detection of the jump signal of the qualities of power supply such as voltage dip, voltage swells and non-stationary signal.Native system adopts Wavelet Transform, and is effective especially for the transient signals of analyzing sudden change.Because rising sharply of line current can cause the rapid drawdown of points of common connection voltage, the rapid drawdown meeting of line current causes rising sharply of points of common connection voltage, when voltage rises sharply rapid drawdown, the line current of non-interference source also can fluctuate, but after filtering rose sharply the transient process of rapid drawdown, the electric current of interference source changed the different relation that presents with node voltage.Therefore can judge the source of voltage swells rapid drawdown by the monitoring load impedance.Native system has been studied the monitoring and the orientation of voltage swells rapid drawdown, use wavelet analysis method to catch the voltage swells rapid drawdown from the real-time voltage waveform, in case monitor corresponding transient state process, effective value change curve with regard to the Monitoring Line electric current, judge whether the voltage swells rapid drawdown is relevant with this circuit, thereby reach the monitoring and the directed purpose of voltage swells rapid drawdown.
The frequency analysis treating apparatus carries out analyzing and processing to the original signal data in first memory storage: according to the nonlinearity NLR of voltage and current waveform signal in frequency domain definition and calculated load, and the reference value of NLR and default compared, the NLR value is greater than setting value in the time of setting, and then place, the source of the pairing voltage and current waveform signal of this NLR value is harmonic pollution source.
The analyzing and processing process of frequency analysis treating apparatus is specific as follows:
The voltage and current data-signal of each passage of gathering according to signal pickup assembly carries out transformation calculations to the voltage and the current signal of a fundamental frequency cycles, obtains voltage magnitude, current amplitude and voltage-phase and the current phase of each harmonic; Further rated output factor;
Harmonic current limit value according to systematic parameter and load protocol capacity calculated load compares the current amplitude of conversion gained and the harmonic current limit value of load, seeks the harmonic wave that surpasses current limit;
At the harmonic wave of current amplitude above limit value, calculate its harmonic impedance,
Define and calculate the corresponding nonlinearity NLR that loads at frequency domain, and compare according to the reference value of setting, the NLR value is greater than setting value in the time of setting, and then place, the source of the pairing voltage and current waveform signal of this NLR value is harmonic pollution source.
This is a kind of analysis orientation method of harmonic pollution source, realize the online orientation of harmonic pollution source by the nonlinearity of definition impedance, solve conventional art and can only find the fractional harmonic source, also can't carry out directed technical matters to it, the person liable that can clearly pollute sets up rational Power Market.
Harmonic problem mainly is to be caused by the nonlinear-load in the supply network, so harmonic pollution source orientation problem is exactly the discriminating of nonlinear-load in fact.The utility model is monitored the fluctuation status of load impedance parameter under the operating condition that exists waveform to pollute, and then can be by calculating the influence degree that its nonlinearity come the comparison different load that system's waveform is polluted.In above-mentioned analyzing and processing, the load that parameter fluctuation is bigger, NLR is bigger for its nonlinearity, and is also just bigger to the waveform pollution effect of electrical network.The real-time Monitoring Line voltage and current of monitoring described in the utility model and orientation system waveform, and analyze and handle, the nonlinearity index that obtains loading, with this basis for estimation as harmonic pollution source, avoided harmonic power to flow to the theoretical defects of method, comprehensively harmonic pollution source in monitoring and the directed electrical network.
The analyzing and processing process of flickering APU is specific as follows:
The voltage and current data-signal of each passage of gathering according to signal pickup assembly, the amplitude and the phase place of following the tracks of first-harmonic, and then calculate impedance of fundamental frequency, the variation tendency of following the tracks of impedance of fundamental frequency;
When calculated load inserts separately then, the change in voltage curve of points of common connection;
Do spectrum analysis in the quantitative time according to transformation calculations, obtain the flickering intensity in the setting-up time;
The flickering intensity level that obtains and the benchmark flickering intensity level of default are compared, and when obtaining the flickering intensity level greater than setting value, then the signal source with this passage is decided to be the flickering pollution source;
Analysis and processing procedure and result are stored in second memory storage.
An important indicator---the flickering of the quality of power supply, it is meant that voltage fluctuation hinders the normal operation that is connected other electric equipments on the points of common connection, that is: the parameter generating period variation of loading when high capacity, will cause node voltage fluctuation or flickering, and in electric power system, propagate, influence the normal operation of other loads.Because points of common connection often is connected with a plurality of power loads, monitors the order of severity that individual node voltage can only be assessed voltage fluctuation or flickering merely, can not judge the source that flickering is disturbed.The flickering model that adopts in the current research work is followed the relevant criterion of IEC substantially, think that flickering is because the amplitude modulated making of voltage rises, so the flickermeter that uses is all followed the agreement of which amplitude modulation at present, but in the running environment that exists flickering to disturb, the electric current of constant duty also fluctuates, and the flickering that a subharmonic and a harmonic wave cause, the flickering that the harmonic voltage modulation produces also exists, therefore refine location feature from the voltage magnitude modulation pattern merely, it is not enough calculating flickering intensity.
Wavelet Transform has been adopted in the monitoring of electrical network flickering, gathers the voltage and current Wave data of circuit in real time, effective change curve of floating voltage and electric current, and the characteristic parameter of further identification contaminative load, and obtain the pollution intensity that contaminative is loaded.This system has realized the Conjoint Analysis of voltage, current signal first, differentiates the source of the flickering pollutant component that contains in load voltage or the electric current, thereby reaches monitoring of flickering pollution source and directed purpose.
In fact, because voltage is the coefficient result of a plurality of loads in the zone, the voltage waveform in the simple analyzed area can not judge still which the flickering pollution source load from.The utility model is the electrical parameter by direct detection load, comprise that the voltage and current parameter analyzes, calculates and handle, and the flickering intensity level that obtains corresponding load is judged, so just can find pollution source directly, accurately, be further clear and definite pollution source responsibility, administer the electric network pollution source data basis is provided.
In sum, characteristics of the present utility model are, a kind of monitoring device of pollution sources of electrical energy quality is provided, this device has been realized the online orientating function of pollution sources of electrical energy quality first, focus on for electric power system provides effectively, avoid polluting the propagation on a large scale of signal, improve grid supply quality, for the settling mode of electric energy pollution source provides unified standard and theoretical basis, the pollution source monitoring and the directed technical development of electrical network had great significance.This device provides the monitoring and the orientation in three kinds of electric network pollution sources: the monitoring and the orientation that at first are the voltage swells rapid drawdown, use wavelet analysis method to catch the voltage swells rapid drawdown from the real-time voltage waveform, in case monitor corresponding transient state process, effective value change curve with regard to the Monitoring Line electric current, judge whether the voltage swells rapid drawdown is relevant with this circuit, thereby reach the monitoring and the directed purpose of voltage swells rapid drawdown; Next is the monitoring and the orientation of harmonic pollution source, the theoretical defects that it has avoided traditional harmonic power to flow to, and analyzing and processing is simple and reliable, has good online application power; Be the monitoring and the orientation of flickering pollution source at last, it has realized the Conjoint Analysis of voltage, current signal first, differentiates the flickering pollutant component source of containing in load voltage or the electric current, reaches flickering and pollutes directed technical purpose.
Description of drawings
Figure 1 shows that the structural representation of the monitoring device of pollution sources of electrical energy quality described in the utility model;
Below in conjunction with embodiment the utility model is described further.
Specific embodiment
Most preferred embodiment:
With reference to accompanying drawing 1, the monitoring device of pollution sources of electrical energy quality includes signal pickup assembly, signal processing module, first memory storage and second memory storage; The output terminal of signal pickup assembly connects first memory storage, signal processing module includes frequency analysis treating apparatus, flickering APU and voltage swells rapid drawdown treating apparatus, it receives the signal of first memory storage, after carrying out analyzing and processing, result is stored in second memory storage.
Signal pickup assembly includes analog-digital commutator, frequency overlapped-resistable filter and programmable digital collector, and is connected in series in regular turn.Analog-digital commutator is for conversion into digital signal with the waveform signal of electric current and voltage through high precision, carries out filtering via frequency overlapped-resistable filter then, carries out the high-speed real-time collection by the programmable digital collector at last.Data after the collection can stick into line data exchange by usb data bus and Industry Control, are sent to carry out real-time analysis in the signal processing module and handle the system centre that the result that real-time analysis is handled can upload by Ethernet interface.
Analog-digital commutator can be selected A/D conversion chip AD7656, the FPGA singlechip chip that frequency overlapped-resistable filter and programmable digital collector can select ALTERA company to produce, and model is EP1K30QC208.First memory storage can adopt the dual port RAM chip, and model is CY7C025.
The work schedule of AD7656 is provided by fpga chip EP1K30QC208, and behind the A/D EOC, FPGA reads transformation result, and transformation result is stored into dual port RAM as first memory storage.
The model that signal processing module can select Ti company to produce is the DSP process chip of TMS320VC33.Second memory storage includes growth data memory storage and program storage device, is specially the ram space of growth data and the FLASH of procedure stores.With first memory storage, second memory storage adopts can adopt the dual port RAM chip, and model is CY7C025.
Form the system supplymentary administration module by ARM9 processor and CF card.ARM9 CPU is based on a LPC2292 microcontroller of supporting 16/32 of real-time simulation and embedded tracking, has the high speed Flash storer that 256KB embeds.
Describe the concrete principle of work and the workflow of the utility model monitoring device below in detail:
1, signal pickup assembly is gathered the voltage and current waveform signal in the electrical network in real time, and this waveform signal stored in first memory storage as raw data, include voltage swells rapid drawdown APU in the signal processing module, frequency analysis treating apparatus and flickering APU;
2, voltage swells rapid drawdown APU, its analyzing and processing process is as follows:
The voltage and current data-signal of each passage of gathering according to signal pickup assembly;
Based on the wavelet transformation in cycle, extract the voltage magnitude change curve;
Whether the floating voltage amplitude surpasses 10% of setting value in the setting-up time that continues;
If voltage magnitude surpasses setting value in setting-up time, then calculate the electric current on the circuit of every on the bus in the corresponding region, and extract the current amplitude change curve based on the wavelet transformation in cycle;
Contrast potential amplitude change curve and current amplitude change curve, if the two lifting simultaneously, then this circuit is that non-voltage swells rapid drawdown is polluted, if the two is one rise and one drop, then this circuit is voltage swells rapid drawdown pollution source.
Analysis and processing procedure and result are stored in second memory storage.
3, the analyzing and processing process of frequency analysis treating apparatus is specific as follows:
The voltage and current data-signal of each passage of gathering according to signal pickup assembly carries out transformation calculations to the voltage and the current signal of a fundamental frequency cycles, obtains voltage magnitude, current amplitude and voltage-phase and the current phase of each harmonic; Further rated output factor;
Harmonic current limit value according to systematic parameter and load protocol capacity calculated load compares the current amplitude of conversion gained and the harmonic current limit value of load, seeks the harmonic wave that surpasses current limit;
At the harmonic wave of current amplitude above limit value, calculate its harmonic impedance,
Define and calculate the corresponding nonlinearity NLR that loads at frequency domain, and compare according to the reference value of setting, the NLR value is greater than setting value in the time of setting, and then place, the source of the pairing voltage and current waveform signal of this NLR value is harmonic pollution source.
4, the flickering APU carries out analyzing and processing to the raw data that receives:
The voltage and current data-signal of each passage of gathering according to signal pickup assembly, the amplitude and the phase place of following the tracks of first-harmonic, and then calculate impedance of fundamental frequency, the variation tendency of following the tracks of impedance of fundamental frequency;
When calculated load inserts separately then, the change in voltage curve of points of common connection;
Do spectrum analysis in the quantitative time according to transformation calculations, obtain the flickering intensity in the setting-up time;
The flickering intensity level that obtains and the benchmark flickering intensity level of default are compared, and when obtaining the flickering intensity level greater than setting value, then the signal source with this passage is decided to be the flickering pollution source;
Analysis and processing procedure and result are stored in second memory storage.
It is same as the prior art that the utility model is not stated part.
Claims (4)
1. the monitoring device of pollution sources of electrical energy quality, it is characterized in that: include signal pickup assembly, signal processing module, first memory storage and second memory storage, the output terminal of signal pickup assembly connects first memory storage, signal processing module includes frequency analysis treating apparatus, flickering APU and voltage swells rapid drawdown treating apparatus, it receives the signal of first memory storage, after carrying out analyzing and processing, result is stored in second memory storage.
2. the monitoring device of pollution sources of electrical energy quality according to claim 1 is characterized in that, signal pickup assembly includes analog-digital commutator, frequency overlapped-resistable filter and programmable digital collector, and is connected in series in regular turn.
3. the monitoring device of pollution sources of electrical energy quality according to claim 1, it is characterized in that, analog-digital commutator is selected A/D conversion chip AD7656, the FPGA singlechip chip that frequency overlapped-resistable filter and programmable digital collector select ALTERA company to produce, and model is EP1K30QC208.
4. the monitoring device of pollution sources of electrical energy quality according to claim 1 is characterized in that, signal processing module is that the model that a kind of Ti company produces is the DSP process chip of TMS320VC33.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202713008U CN201548635U (en) | 2009-11-30 | 2009-11-30 | Monitoring device for pollution source of power quality |
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| CN2009202713008U CN201548635U (en) | 2009-11-30 | 2009-11-30 | Monitoring device for pollution source of power quality |
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| CN201548635U true CN201548635U (en) | 2010-08-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692574A (en) * | 2012-05-22 | 2012-09-26 | 福建省电力有限公司电力科学研究院 | Method for detecting injection level of flickering pollution of interference load |
| CN103778341A (en) * | 2014-01-27 | 2014-05-07 | 福州大学 | Method for estimating probabilistic load flow of harmonic pollution user |
| CN104267295A (en) * | 2014-10-20 | 2015-01-07 | 国网山西省电力公司晋城供电公司 | Electric network pollution data star-shaped collection system based on PQDIF standard |
-
2009
- 2009-11-30 CN CN2009202713008U patent/CN201548635U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692574A (en) * | 2012-05-22 | 2012-09-26 | 福建省电力有限公司电力科学研究院 | Method for detecting injection level of flickering pollution of interference load |
| CN103778341A (en) * | 2014-01-27 | 2014-05-07 | 福州大学 | Method for estimating probabilistic load flow of harmonic pollution user |
| CN103778341B (en) * | 2014-01-27 | 2017-02-15 | 福州大学 | Method for estimating probabilistic load flow of harmonic pollution user |
| CN104267295A (en) * | 2014-10-20 | 2015-01-07 | 国网山西省电力公司晋城供电公司 | Electric network pollution data star-shaped collection system based on PQDIF standard |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20161130 |