CN105223452B - Realize electric energy quality monitoring and the electric energy quality monitor and method of pollution sources positioning - Google Patents
Realize electric energy quality monitoring and the electric energy quality monitor and method of pollution sources positioning Download PDFInfo
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Abstract
The invention discloses a kind of electric energy quality monitor and method for realizing electric energy quality monitoring and pollution sources positioning, it is related to electric energy quality monitor field.The monitor includes signal pickup assembly, signal processing apparatus, system control device and the industrial computer being sequentially connected with.In use, the A phase voltage waveforms of power network signal are formed sine wave signal by signal pickup assembly after second-order filter, sine wave signal is become by square-wave signal by Zero-cross comparator；Signal processing apparatus according to go flash removed disturb after square-wave signal cycle, sample frequency is adjusted to being sampled and being handled after external frequency synchronization；System control device carries out data analysis and obtains quality of power supply technical parameter；Industrial computer counts according to power quality analysis, generates quality of power supply form, and pollution sources of electrical energy quality is positioned according to the quality of power supply exceeded parameter.The present invention can not only effectively improve the measurement accuracy of power quality parameter, and can also realize the positioning of pollution sources of electrical energy quality.
Description
Technical field
The present invention relates to electric energy quality monitor field, is specifically that one kind realizes that electric energy quality monitoring and pollution sources are determined
The electric energy quality monitor and method of position.
Background technology
As expanding economy and the continuous improvement of industrialization degree, power grid construction scale are also increasingly complicated and huge, electricity
Power net load sharply increases.Particularly a large amount of non-linear, impact load accesses in recent years, will produce substantial amounts of harmonic injection
Power system, the whole network electric power is influenceed, cause voltage ripple of power network and flickering, so that power network quality of power supply degradation, and
Various power system accidents are induced, power system is faced " pollution " of getting worse.The quality of power supply is power industry product
Important indicator, it is related to hair, the rights and interests for, each side, the excellent quality of power supply is to ensureing power network and users' electrical equipment
Safe and reliable operation, ensure national economy all trades and professions normal production and product quality and improve people's living standard all
It is significant.
In order to carry out the quality of power supply long-term monitoring in real time, so as to reach the comprehensively handle horizontal to the whole network quality of power supply
Hold, basic data is provided for the comprehensive regulation of the quality of power supply, electric energy quality on-line monitoring device is progressively installed in transformer station and is shown
Obtain very necessary.In addition, to may the analysis of the power network as caused by power quality problem or equipment fault be also required to real-time electricity
The support of energy qualitative data.The construction and perfect in shape and function of power network Electric Power Quality On-line Monitor System, will progressively it enrich to the whole network electricity
The understanding of energy quality, the whole network quality of power supply level is understood conscientiously, is laid a solid foundation for the comprehensive regulation of the quality of power supply.
Traditional electric energy quality monitor function is simple, and typically using single CPU, measurement accuracy is not high, and in fundamental frequency
The measurement of correlation power quality parameter is inaccurate when changing, i.e., CPU sampling rates can not follow outer veil frequency to change, this
Result in the problems such as spectral leakage measurement is inaccurate.
In addition, traditional electric energy quality monitor is that each parameter of the quality of power supply of monitoring point is supervised in real time
Survey and analytic statistics is carried out to relevant historical data, ultimately generate the form of each monitoring parameters of the quality of power supply.But to causing electric energy
The pollution sources of quality problems can not be automatically positioned, it is necessary to which manually the monitoring historical data to each monitoring point is checked and analyzed
Contrast, then could tentatively judge pollution sources, this results in the waste of a large amount of manpower and materials.Simultaneously as artificial basis point
Scattered electric energy quality monitoring point judges pollution sources of electrical energy quality, and its accuracy is limited by Personnel Skill Levels, along with electric energy matter
It is professional very strong work in itself to measure pollution sources positioning.This just occurs unavoidably loses to pollution sources of electrical energy quality discriminatory analysis
By mistake, the problem of causing position inaccurate, the position selection error of power quality controlling point is resulted even in when serious, so as to cause
The economic loss of power supply enterprise.
The content of the invention
The invention aims to overcome the shortcomings of above-mentioned background technology, there is provided one kind realizes electric energy quality monitoring and dirt
The electric energy quality monitor and method of dye source positioning, the measurement accuracy of power quality parameter can be not only effectively improved, but also
The positioning of pollution sources of electrical energy quality can be realized.
To achieve the above objectives, the present invention provides a kind of quality of power supply prison realized electric energy quality monitoring and pollution sources and positioned
Survey instrument, including signal pickup assembly, signal processing apparatus, system control device and the industrial computer being sequentially connected with；
Signal pickup assembly is used for：The A phase voltage waveforms of power network signal are formed into sine wave signal after second-order filter,
Sine wave signal is become by square-wave signal by Zero-cross comparator；Square-wave signal is carried out at level conversion and deburring, Key dithering
Signal processing apparatus is input to after reason；
Signal processing apparatus is used for：Enter during each rising edge of square-wave signal and interrupt, according to interrupting twice in succession
The internal pulses number recorded, the frequent rate of net of external electrical network is calculated；By the sample frequency of signal processing apparatus adjust to
After the net frequency Frequency Synchronization of external electrical network, sampling and Temporal Data analyzing and processing are synchronized, and by the stable state waveform of sampling
Data are sent to system control device；
System control device is used for：Stable state waveform data are carried out with data analysis and obtains quality of power supply technical parameter, and will
Quality of power supply technical parameter is sent to industrial computer；
Industrial computer is used for：Power quality analysis statistics is carried out to all quality of power supply technical parameters；According to the quality of power supply point
Analysis statistics, generates various quality of power supply forms；The exceeded parameter of the quality of power supply is obtained from power quality analysis statistics, according to electric energy
The exceeded parameter of quality to pollution sources of electrical energy quality carry out location determination, pollution sources of electrical energy quality include harmonic wave/m-Acetyl chlorophosphonazo pollution sources,
It is inclined to fluctuate flickering pollution sources, voltage swells rapid drawdown pollution sources, voltage three-phase imbalance pollution sources, voltage deviation pollution sources, frequency
Poor pollution sources.
On the basis of above-mentioned technical proposal, the signal pickup assembly includes voltage current transformer, active power filtering is put
Big device, zero-crossing comparator, complex programmable logic device (CPLD) chip and analog-digital converter；The input of voltage current transformer
It is connected with power network signal, the input with active power filtering amplifier, the input of zero-crossing comparator are connected output end respectively；Zero passage
The output end of comparator is connected with the input of CPLD chips；The output end of active power filtering amplifier, the control mould of CPLD chips
The I/O port of number conversion is connected with the input of analog-digital converter；The output end of analog-digital converter connects with signal processing apparatus
Connect.
On the basis of above-mentioned technical proposal, if industrial computer is run for the first time, all quality of power supply technical parameters are to work as
Preceding quality of power supply technical parameter；If the non-first operation of industrial computer, all quality of power supply technical parameters are the current quality of power supply
The history quality of power supply technical parameter that technical parameter and whole service period preserve.
On the basis of above-mentioned technical proposal, the signal processing apparatus is also associated with the extension for preserving sampled data
Memory, and the in-circuit emulation for signal processing apparatus and the JTAG emulation interface of download program.
On the basis of above-mentioned technical proposal, the system control device is also associated with for realizing human-computer dialogue operation
LCD interfaces, keyboard interface.
The present invention also provides a kind of method for realizing electric energy quality monitoring and pollution sources positioning based on above-mentioned monitor, bag
Include following steps：
S1：Signal pickup assembly receives the power network signal of each monitoring point；The A phase voltage waveforms of power network signal are passed through into second order
Sine wave signal is formed after filtering, sine wave signal is become by square-wave signal by Zero-cross comparator；Square-wave signal is entered into line level
Signal processing apparatus is input to after conversion and deburring, de-jitter, is transferred to S2；
S2：Signal processing apparatus enters during each rising edge of square-wave signal to interrupt, according to interrupting institute twice in succession
The internal pulses number of record, the frequent rate of net of external electrical network is calculated；By the sample frequency of signal processing apparatus adjust to
After the net frequency Frequency Synchronization of external electrical network, sampling and Temporal Data analyzing and processing are synchronized, and by the Steady Wave figurate number of sampling
According to sending to system control device, S3 is transferred to；
S3：System control device carries out data analysis to stable state waveform data and obtains quality of power supply technical parameter, and by electricity
Energy quality technology parameter is sent to industrial computer, is transferred to S4；
S4：Industrial computer carries out power quality analysis statistics to all quality of power supply technical parameters；According to power quality analysis
Statistics, generates various quality of power supply forms；The exceeded parameter of the quality of power supply is obtained from power quality analysis statistics, according to electric energy matter
Measure exceeded parameter and location determination is carried out to pollution sources of electrical energy quality, wherein, pollution sources of electrical energy quality includes harmonic wave/m-Acetyl chlorophosphonazo pollution
Source, fluctuation flickering pollution sources, voltage swells rapid drawdown pollution sources, voltage three-phase imbalance pollution sources, voltage deviation pollution sources, frequency
Deviation pollution sources.
On the basis of above-mentioned technical proposal, the exceeded ginseng of the quality of power supply is obtained from power quality analysis statistics described in S4
Number, location determination is carried out to pollution sources of electrical energy quality according to the exceeded parameter of the quality of power supply, specifically includes following steps：
S401：Electric energy quality harmonic/m-Acetyl chlorophosphonazo index parameter is chosen from power quality analysis statistics, judges the quality of power supply
Whether harmonic wave/m-Acetyl chlorophosphonazo index parameter is exceeded, if it is not, being directly transferred to S402；If so, determine into harmonic wave/m-Acetyl chlorophosphonazo pollution sources
Position judges：The non-linear resistance degree DR and reactance nonlinearity DX in every loop in the range of 2~50 subharmonic are calculated, is calculated
Formula is：
In above-mentioned formula, R1 is fundamental wave resistance, and Rh is the h times fundamental wave resistance, and h is the positive integer of 2≤h≤50, and N is harmonic wave
Total degree 50, X1 is fundamental reactance, and Xh is the h times fundamental reactance；
When non-linear resistance degree DR and reactance nonlinearity DX level off to 0 when, it is linear load to illustrate the loop load, no
Harmonic wave can be produced, then the loop is not harmonic wave/m-Acetyl chlorophosphonazo pollution sources；When non-linear resistance degree DR and reactance nonlinearity DX are big
When 3, it is nonlinear-load to illustrate the loop load, then the loop is harmonic wave/m-Acetyl chlorophosphonazo pollution sources, is transferred to S402；
S402：Quality of power supply flickering index parameter is chosen from power quality analysis statistics, judges that quality of power supply flickering refers to
Whether exceeded parameter is marked, if it is not, being directly transferred to S403；If so, enter the location determination of fluctuation flickering pollution sources：Every is calculated to return
Flickering value when load is independently accessed in road, judge whether flickering value when load is independently accessed in every loop is exceeded, if so,
Then the loop is fluctuation flickering pollution sources, is transferred to S403；If it is not, then the loop is not fluctuation flickering pollution sources, S403 is transferred to；
S403：Quality of power supply voltage swells rapid drawdown index parameter is chosen from power quality analysis statistics, judges electric energy matter
Measure in voltage swells rapid drawdown index parameter and interrupt transient information with the presence or absence of voltage swells rapid drawdown, if being not present, be directly transferred to
S404；If in the presence of into the location determination of voltage swells rapid drawdown pollution sources：Judge system voltage when rising sharply rapid drawdown every
Whether front and rear 3-5 cycles electric current is synchronous change corresponding to loop, if so, then the loop is not voltage swells rapid drawdown pollution sources,
It is transferred to S404；If it is not, then the loop is voltage swells rapid drawdown pollution sources, S404 is transferred to；
S404：Quality of power supply voltage three-phase imbalance index parameter is chosen from power quality analysis statistics, judges electric energy
Whether quality voltage three-phase imbalance index parameter is exceeded, if it is not, being directly transferred to S405；If so, into voltage three-phase imbalance
The location determination of pollution sources：Analyze the value and three-phase current unbalance degree of the three-phase current in every loop, if a phase in loop or
The load current value of two-phase is more than the 90% of oepration at full load electric current, and three-phase current unbalance degree is more than 60%, then judging should
Loop is voltage three-phase imbalance pollution sources, is transferred to S405；
S405：Quality of power supply voltage deviation index parameter is chosen from power quality analysis statistics, judges quality of power supply electricity
Press Deviation Indices parameter whether exceeded, if it is not, being directly transferred to S406；If so, the location determination into voltage deviation pollution sources：Sentence
Disconnected every loop exceedes system nominal capacity with the presence or absence of apparent energy S or load power factor is less than the situation of rated value, if
In the presence of then the loop is voltage deviation pollution sources, is transferred to S406；If being not present, the loop is not voltage deviation pollution sources, is turned
Enter S406；
S406：Quality of power supply electric voltage frequency index parameter is chosen from power quality analysis statistics, judges quality of power supply electricity
Whether voltage-frequency rate index parameter is exceeded, if it is not, directly terminating；If so, the location determination into frequency departure pollution sources：Judge every
It is specified electricity that bar loop exceeds the situation of corresponding rated capacity or actual motion electric current with the presence or absence of active-power P, apparent energy S
The big situation of 95% and current fluctuation of stream, if in the presence of the loop is frequency departure pollution sources；If being not present, this time
Road is not frequency departure pollution sources, is terminated.
Flickering when load is independently accessed in every loop is calculated on the basis of above-mentioned technical proposal, described in S402
Value, specifically includes following steps：
S402a：Voltage pulsation curve U (t), the current fluctuation curve I (t) in every loop are calculated, is transferred to S402b；
S402b：Bring the voltage pulsation curve U (t) being calculated, current fluctuation curve I (t) into instantaneous apparent energy S
(t) calculation formula, obtain voltage and float angleAngle is floated with electric currentS (t) calculation formula is：
ω is electrical angle in formula, and t is instantaneous time, is transferred to S402c；
S402c：Angle is floated according to voltageAngle is floated with electric currentDerive that load uses impedance model：ZL=R+JX, wherein,
R is resistance, and JX is reactance, is transferred to S402d；
S402d：If system voltage is Us, system short circuit capacity Sd, is then derived according to load using impedance model and be
Unite impedance Z s=Us2/Sd, is transferred to S402e；
S402e：According to resistance R, reactance JX, system impedance Zs and system voltage Us, calculate when load is independently accessed
Points of common connection voltage Ud, calculation formula are：Ud=[(R+JX)/(Zs+R+JX)] × Us, is transferred to S402f；
S402f：Points of common connection voltage Ud when being independently accessed according to load, calculate load in every loop and individually connect
Fashionable flickering value, terminate.
The beneficial effects of the present invention are：
(1) signal processing apparatus is provided with electric energy quality monitor of the invention, the signal processing apparatus can pass through
Sine, which turns to enter during each rising edge of the square-wave signal in the reflection net frequency cycle after circuit and square-wave conversion, to interrupt, according to continuous
Recorded internal pulses number is interrupted twice, and the frequent rate of net of external electrical network is calculated；Pass through the net frequency frequency adjusting signals
The initial value of the sample clock generator of processing unit so that the sample frequency of signal processing apparatus and the frequent rate of the net of external electrical network are same
Step, avoid that spectral leakage occurs.The sample frequency of the present invention can follow outer net net frequency to change when net frequency fluctuates, and realize sampling frequency
Rate is synchronous, solves the problems, such as that single CPU sample frequencys can not follow outer net net frequency to change in the prior art, so as to improve electric energy
The measurement accuracy of mass parameter.
(2) electric electric energy quality monitor of the invention can not only meet that the general user of electric energy quality monitoring and state's net are public
The requirement (such as historical data analysis counts, the function such as quality of power supply report generation) of the general electric energy quality monitoring of department, also simultaneously
Possess pollution sources of electrical energy quality positioning function, can accurately distinguish pollution sources of electrical energy quality and uncontamination source.The electric energy quality monitoring
The pollution sources positioning function of instrument includes harmonic wave/m-Acetyl chlorophosphonazo pollution sources, fluctuation flickering pollution sources, voltage swells rapid drawdown pollution sources, electricity
Press the positioning of six kinds of pollution sources such as three-phase imbalance pollution sources, voltage deviation pollution sources, frequency departure pollution sources.Use this electric energy
Quality monitor, user can accurately have found pollution sources of electrical energy quality, not only be provided effectively for electric power system and power consumer
Comprehensive power quality management, and a wide range of propagation of pollution sources of electrical energy quality is effectively prevent, grid supply quality is improved,
A large amount of manpower and materials have been saved simultaneously, have improved the economic benefit of power supply enterprise and power consumer.
Brief description of the drawings
Fig. 1 is the structure that electric energy quality monitoring and the electric energy quality monitor of pollution sources positioning are realized in the embodiment of the present invention
Block diagram；
Fig. 2 is the flow chart for the method that electric energy quality monitoring and pollution sources positioning are realized in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of electric energy matter for realizing electric energy quality monitoring and pollution sources positioning
Measure monitor, including signal pickup assembly, signal processing apparatus, system control device and the industrial computer being sequentially connected with；
Signal pickup assembly is used for：The A phase voltage waveforms of power network signal are formed into good sine after second-order filter
Ripple signal, sine wave signal is become by square-wave signal by Zero-cross comparator；Square-wave signal is subjected to level conversion and deburring, gone
Signal processing apparatus is input to after dithering process.
Wherein, signal pickup assembly include be used for receive power network signal voltage current transformer, for realize second order filter
The active power filtering amplifier of ripple, the zero-crossing comparator for sine wave signal to be become to square-wave signal, for realizing level conversion
With deburring, CPLD (Complex Programmable Logic Device, the complicated programmable logic device of de-jitter
Part) chip and the analog-digital converter for simulating grid signal to be converted into data signal；The input of voltage current transformer
It is connected with power network signal, the input with active power filtering amplifier, the input of zero-crossing comparator are connected output end respectively；Zero passage
The output end of comparator is connected with the input of CPLD chips；The output end of active power filtering amplifier, the control mould of CPLD chips
The I/O port of number conversion is connected with the input of analog-digital converter；The output end of analog-digital converter connects with signal processing apparatus
Connect.
Signal processing apparatus is used for：Enter during each rising edge of square-wave signal and interrupt, according to interrupting twice in succession
The internal pulses number recorded, the frequent rate of net of external electrical network is calculated；By the sample frequency of signal processing apparatus adjust to
After the net frequency Frequency Synchronization of external electrical network, sampling and Temporal Data analyzing and processing are synchronized, and by the stable state waveform of sampling
Data are sent to system control device.
Wherein, signal processing apparatus is also connected with extended menory, JTAG emulation interface, and extended menory is adopted for preservation
Sample data (including recorder data of temporary sample data and the of short duration state of voltage)；JTAG emulation interface is connected to realize at signal
Manage in-circuit emulation and the download program of device.Also, signal processing apparatus is sent steady state data to system control by dual port RAM
Device processed.
System control device is used for：Stable state waveform data are carried out with data analysis and obtains quality of power supply technical parameter, and will
Quality of power supply technical parameter is sent to industrial computer.
Wherein, system control device also with the LCD interfaces for realizing human-computer dialogue operation, keyboard interface is connected.Also,
System control device is sent quality of power supply technical parameter to industrial computer by RS485 interfaces or RJ45 interfaces.
Industrial computer is used for：Power quality analysis statistics is carried out to all quality of power supply technical parameters；According to the quality of power supply point
Analysis statistics, various quality of power supply forms are generated in a manner of render history curve, and (quality of power supply form generated can be electric energy
The control of toatal quality control(TQC) and the quality of power supply provides decision-making foundation and the technical support of science)；And divide from the quality of power supply
The exceeded parameter of the quality of power supply is obtained in analysis statistics, carrying out positioning to pollution sources of electrical energy quality according to the exceeded parameter of the quality of power supply sentences
Disconnected, pollution sources of electrical energy quality includes harmonic wave/m-Acetyl chlorophosphonazo pollution sources, fluctuation flickering pollution sources, voltage swells rapid drawdown pollution sources, voltage
Three-phase imbalance pollution sources, voltage deviation pollution sources, frequency departure pollution sources.
Wherein, if industrial computer is run for the first time, all quality of power supply technical parameters are current quality of power supply technical parameter；
If the non-first operation of industrial computer, when all quality of power supply technical parameters are current quality of power supply technical parameter and whole service
Between section preserve history quality of power supply technical parameter.
It is shown in Figure 2, the embodiment of the present invention also provide it is a kind of based on above-mentioned monitor realize electric energy quality monitoring and
The method of pollution sources positioning, comprises the following steps：
S1：Signal pickup assembly receives the power network signal of each monitoring point；The A phase voltage waveforms of power network signal are passed through into second order
Sine wave signal is formed after filtering, sine wave signal is become by square-wave signal by Zero-cross comparator；Square-wave signal is entered into line level
Signal processing apparatus is input to after conversion and deburring, de-jitter, is transferred to S2.
S2：Signal processing apparatus enters during each rising edge of square-wave signal to interrupt, according to interrupting institute twice in succession
The internal pulses number of record, the frequent rate of net of external electrical network is calculated；Pass through the sample clock generator of Regulate signal processing unit
Initial value, the sample frequency of signal processing apparatus is adjusted to the net frequency Frequency Synchronization with external electrical network, synchronizes and adopts
Sample and Temporal Data analyzing and processing, and the stable state waveform data of sampling are sent to system control device, it is transferred to S3.
S3：System control device carries out data analysis to stable state waveform data and obtains quality of power supply technical parameter, and by electricity
Energy quality technology parameter is sent to industrial computer, is transferred to S4.
S4：Industrial computer carries out power quality analysis statistics to all quality of power supply technical parameters；According to power quality analysis
Statistics, generates various quality of power supply forms in a manner of render history curve；Electric energy matter is obtained from power quality analysis statistics
Exceeded parameter is measured, location determination is carried out to pollution sources of electrical energy quality according to the exceeded parameter of the quality of power supply；Wherein, the quality of power supply is exceeded
Parameter of the parameter for power quality index parameter after exceeded, power quality index parameter refer to including electric energy quality harmonic/m-Acetyl chlorophosphonazo
It is uneven to mark parameter, quality of power supply flickering index parameter, quality of power supply voltage swells rapid drawdown index parameter, quality of power supply voltage three-phase
Weigh index parameter, quality of power supply voltage deviation index parameter and quality of power supply electric voltage frequency index parameter；Pollution sources of electrical energy quality
Including harmonic wave/m-Acetyl chlorophosphonazo pollution sources, fluctuation flickering pollution sources, voltage swells rapid drawdown pollution sources, voltage three-phase imbalance pollution sources,
Voltage deviation pollution sources, frequency departure pollution sources.
During practical operation, the exceeded parameter of the quality of power supply is obtained from power quality analysis statistics described in S4, according to electric energy
The exceeded parameter of quality carries out location determination to pollution sources of electrical energy quality, specifically includes following steps：
S401：Electric energy quality harmonic/m-Acetyl chlorophosphonazo index parameter is chosen from power quality analysis statistics, judges the quality of power supply
Whether harmonic wave/m-Acetyl chlorophosphonazo index parameter is exceeded (to exceed the corresponding standard value that has set, standard value is according to the states of different voltage class
Scale value determines), if it is not, be directly transferred to S402；If so, the location determination into harmonic wave/m-Acetyl chlorophosphonazo pollution sources：Calculate every
Non-linear resistance degree DR and reactance nonlinearity DX, calculation formula in loop in the range of 2~50 subharmonic are：
In formula, R1 is fundamental wave resistance, and Rh is the h times fundamental wave resistance, and h is the positive integer of 2≤h≤50, and N is the total of harmonic wave
Number 50, X1 are fundamental reactance, and Xh is the h times fundamental reactance；
When non-linear resistance degree DR and reactance nonlinearity DX level off to 0 when, it is linear load to illustrate the loop load, no
Harmonic wave can be produced, then it is not anharmonic wave/m-Acetyl chlorophosphonazo pollution sources to judge the loop；As non-linear resistance degree DR and reactance nonlinearity
When DX is all higher than 3, it is nonlinear-load to illustrate the loop load, then it is harmonic wave/m-Acetyl chlorophosphonazo pollution sources to judge the loop, is transferred to
S402。
S402：Quality of power supply flickering index parameter is chosen from power quality analysis statistics, judges that quality of power supply flickering refers to
Whether mark parameter is exceeded (to exceed the corresponding standard value set, standard value is according to state's scale value of different voltage class come really
It is fixed), if it is not, being directly transferred to S403；If so, enter the location determination of fluctuation flickering pollution sources：Calculate load list in every loop
Solely flickering value during access, judges whether flickering value when load is independently accessed in every loop is exceeded, if so, then the loop is
Flickering pollution sources are fluctuated, are transferred to S403；If it is not, then the loop is not fluctuation flickering pollution sources, S403 is transferred to.
Wherein, flickering value when load is independently accessed in every loop is calculated in S402, specifically includes following steps：
S402a：Voltage pulsation curve U (t), the current fluctuation curve I (t) in every loop are calculated, is transferred to S402b；
S402b：Bring the voltage pulsation curve U (t) being calculated, current fluctuation curve I (t) into instantaneous apparent energy S
(t) calculation formula, obtain voltage and float angleAngle is floated with electric currentInstantaneously apparent energy S (t) calculation formula is：
ω is electrical angle in formula, and t is instantaneous time, is transferred to S402c；
S402c：Angle is floated according to voltageAngle is floated with electric currentDerive that load uses impedance model：ZL=R+JX, wherein,
R is resistance, and JX is reactance, is transferred to S402d；
S402d：If system voltage is Us, system short circuit capacity Sd, is then derived according to load using impedance model and be
Unite impedance Z s=Us2/Sd, is transferred to S402e；
S402e：According to resistance R, reactance JX, system impedance Zs and system voltage Us, calculate when load is independently accessed
Points of common connection voltage Ud, calculation formula are：Ud=[(R+JX)/(Zs+R+JX)] × Us, is transferred to S402f；
S402f：Points of common connection voltage Ud when being independently accessed according to load, calculate load in every loop and individually connect
Fashionable flickering value.
S403：Quality of power supply voltage swells rapid drawdown index parameter is chosen from power quality analysis statistics, judges electric energy matter
Measure in voltage swells rapid drawdown index parameter and interrupt transient information with the presence or absence of voltage swells rapid drawdown, if being not present, be directly transferred to
S404；If in the presence of into the location determination of voltage swells rapid drawdown pollution sources：Judge system voltage when rising sharply rapid drawdown every
Whether front and rear 3-5 cycles electric current corresponding to loop is synchronous change (i.e. voltage x current increases or synchronously reduced to be synchronous), if so,
Then the loop is not voltage swells rapid drawdown pollution sources, is transferred to S404；If it is not, then the loop is voltage swells rapid drawdown pollution sources, turn
Enter S404.
S404：Quality of power supply voltage three-phase imbalance index parameter is chosen from power quality analysis statistics, judges electric energy
Whether quality voltage three-phase imbalance index parameter is exceeded (to exceed the corresponding standard value set, standard value is according to different voltages
State's scale value of grade determines), if it is not, being directly transferred to S405；If so, the positioning into voltage three-phase imbalance pollution sources is sentenced
It is disconnected：The value and three-phase current unbalance degree of the three-phase current in every loop are analyzed, if a phase in loop or the load current of two-phase
90% of value more than oepration at full load electric current, and three-phase current unbalance degree is more than the 60% of respective standard value, then judges this time
Road is voltage three-phase imbalance pollution sources (otherwise, not then being voltage three-phase imbalance pollution sources), is transferred to S405.
S405：Quality of power supply voltage deviation index parameter is chosen from power quality analysis statistics, judges quality of power supply electricity
Whether pressure Deviation Indices parameter is exceeded (to exceed the corresponding standard value that has set, standard value is according to state's scale values of different voltage class
To determine), if it is not, being directly transferred to S406；If so, the location determination into voltage deviation pollution sources：Whether judge every loop
There is a situation where to exceed system nominal capacity or load power factor by apparent energy S that (rated value is according to specifically bearing less than rated value
Lotus feature situation is set), if in the presence of the loop is voltage deviation pollution sources, is transferred to S406；If being not present, the loop
It is not voltage deviation pollution sources, is transferred to S406.
S406：Quality of power supply electric voltage frequency index parameter is chosen from power quality analysis statistics, judges quality of power supply electricity
Whether voltage-frequency rate index parameter is exceeded (to exceed the corresponding standard value that has set, standard value is according to state's scale values of different voltage class
To determine), if it is not, directly terminating；If so, the location determination into frequency departure pollution sources：Judge that every loop whether there is
95% and the electric current that active-power P, apparent energy S exceed the situation of corresponding rated capacity or actual motion electric current is rated current
The big situation of fluctuation, if in the presence of the loop is frequency departure pollution sources；If being not present, the loop is not frequency departure
Pollution sources, terminate.
In order to be better understood from the present invention, the principle to the positioning of six kinds of pollution sources and according to carrying out labor below：
(1) positioning of harmonic wave/m-Acetyl chlorophosphonazo pollution sources：In it the power network of harmonic pollution be present, individually according to the voltage to distort
Waveform and current waveform can not judge that some load is the pollution sources for causing harmonic wave, such as have harmonic pollution in itself in public network
In the case of, the voltage current waveform of constant-impedance is all distortion, when fundamental voltage is added in the load of constant impedance, its electric current
And fundamental frequency, harmonic current will not be produced on load.When load is nonlinear-load, electric current is with applying caused by load
The voltage waveform added is different, forms the harmonic current of distortion, and distortion current will produce voltage drop in line impedance, and cause public affairs
Voltage distortion on tie point altogether.Therefore it can judge whether load is harmonic source according to the linearity of load impedance.
(2) positioning of flickering pollution sources is fluctuated：When load power fluctuates, pressure drop of the load current in system impedance
It will and then fluctuate, so as to cause the fluctuation of the voltage on points of common connection, and then cause voltage flicker.It is however, commonly connected
The electric current of constant load is also fluctuation during voltage pulsation on point, and therefore, the simple voltage monitored on points of common connection can not
Judge the source of interference source.And load fluctuation is the immediate cause of voltage pulsation, the detection of flickering pollution sources is fluctuated actually
It is exactly the discriminating of fluctuating load, therefore, whether flickering value when can be independently accessed according to load is exceeded to be judged the load
Whether it is fluctuation flickering pollution sources.
(3) positioning of voltage swells rapid drawdown pollution sources：Voltage swells rapid drawdown is very big to the harm of user equipment normal operation
, with computer, all kinds of microprocessors and adjustable-speed driver in automatic field application constantly extension, tens milliseconds
Voltage swells rapid drawdown can cause the interruption of production or the product that processes is unqualified causes huge economic losses to user.Voltage
The rapid drawdown that rises sharply is considered as in the industry cycle that the transient power quality for the most serious for influenceing equipment normal operation and service life is asked always
Topic, but because voltage swells rapid drawdown general duration is short, its signal is difficult to catch, so the positioning is always a difficulty
Topic.
According to the mathematical modeling Ug=Us-Is*Rs of foundation, Δ Us=Δ Is*Rs, (in formula, Ug is points of common connection electricity
Pressure, Is are system power, and Rs is system resistance, and Us is system voltage, and Δ Us is points of common connection voltage variety, and Δ Is is to be
System current change quantity) understand：System power and then increases when load current increases, system when load current reduces
Electric current and then reduces.Therefore, corresponded to when being occurred according to voltage swells rapid drawdown event the curent change trend of time come
The judgement of voltage swells rapid drawdown pollution sources is carried out, that is, judges that system voltage is front and rear several corresponding to each loop when rising sharply rapid drawdown
Whether cycle electric current is synchronous change, if so, then this loop is not voltage swells rapid drawdown pollution sources；If it is not, then this loop is electricity
Press the rapid drawdown pollution sources that rise sharply.
(4) positioning of voltage three-phase imbalance pollution sources：The judgement of voltage three-phase imbalance pollution sources is exactly to analyze every
The value of circuit three-phase current and the tri-phase unbalance factor of three-phase current.Specifically, the three-phase current in every loop need to be analyzed
Value and three-phase current unbalance degree, if the three-phase current unbalance degree in certain loop is very big, and the load of a phase or two-phase electricity
Flow valuve is more than the 90% of single-phase oepration at full load electric current, then judges the loop for voltage three-phase imbalance pollution sources.But need
It is bright, when certain circuit three-phase load electric current is smaller, even if current three-phase degree of unbalancedness is larger, or three-phase load electric current
When larger but three-phase current unbalance degree is smaller, it is not voltage three-phase imbalance pollution sources still to judge the loop.
(5) positioning of voltage deviation pollution sources：The main reason for causing voltage deviation larger is that apparent energy exceedes system
The factor such as not enough of system capacity caused by rated capacity or load power factor are relatively low causes.Therefore, judgement can be passed through
Every loop exceedes system nominal capacity with the presence or absence of apparent energy or load power factor is less than the situation of rated value, to judge
Whether it is voltage deviation pollution sources.If in the presence of it is voltage deviation pollution sources to judge the loop；If being not present, this time is judged
Road is not voltage deviation pollution sources.
(6) positioning of frequency departure pollution sources：It is mainly that system active power output and load are active to cause system frequency deviation
(particularly load is run beyond power system capacity) caused by unbalanced power.Therefore, can be by judging that every loop whether there is
95% and the electric current that active-power P, apparent energy S exceed the situation of corresponding rated capacity or actual motion electric current is rated current
The big situation of fluctuation, to determine whether frequency departure pollution sources.If in the presence of it is frequency departure pollution to judge the loop
Source；If being not present, it is not frequency departure pollution sources to judge the loop.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (8)
- A kind of 1. electric energy quality monitor for realizing electric energy quality monitoring and pollution sources positioning, it is characterised in that：Including sequentially connecting Signal pickup assembly, signal processing apparatus, system control device and the industrial computer connect；Signal pickup assembly is used for：The A phase voltage waveforms of power network signal are formed into sine wave signal after second-order filter, passed through Sine wave signal is become square-wave signal by Zero-cross comparator；After square-wave signal is carried out into level conversion and deburring, de-jitter It is input to signal processing apparatus；Signal processing apparatus is used for：Enter during each rising edge of square-wave signal and interrupt, remembered according to interrupting twice in succession The internal pulses number of record, the frequent rate of net of external electrical network is calculated；By the sample frequency of signal processing apparatus adjust to it is outer After the net frequency Frequency Synchronization of portion's power network, sampling and Temporal Data analyzing and processing are synchronized, and by the stable state waveform data of sampling Send to system control device；System control device is used for：Data analysis is carried out to stable state waveform data and obtains quality of power supply technical parameter, and by electric energy Quality technology parameter is sent to industrial computer；Industrial computer is used for：Power quality analysis statistics is carried out to all quality of power supply technical parameters；United according to power quality analysis Meter, generates various quality of power supply forms；The exceeded parameter of the quality of power supply is obtained from power quality analysis statistics, according to the quality of power supply Exceeded parameter carries out location determination to pollution sources of electrical energy quality, and pollution sources of electrical energy quality includes harmonic wave/m-Acetyl chlorophosphonazo pollution sources, fluctuation Flickering pollution sources, voltage swells rapid drawdown pollution sources, voltage three-phase imbalance pollution sources, voltage deviation pollution sources, frequency departure are dirty Dye source.
- 2. the electric energy quality monitor as claimed in claim 1 for realizing electric energy quality monitoring and pollution sources positioning, its feature exist In：The signal pickup assembly includes voltage current transformer, active power filtering amplifier, zero-crossing comparator, complex programmable and patrolled Collect device CPLD chips and analog-digital converter；The input of voltage current transformer is connected with power network signal, output end respectively with The input connection of the input, zero-crossing comparator of active power filtering amplifier；The output end of zero-crossing comparator and CPLD chips Input connects；The output end of active power filtering amplifier, the control analog-to-digital conversion of CPLD chips I/O port and analog-to-digital conversion The input connection of device；The output end of analog-digital converter is connected with signal processing apparatus.
- 3. the electric energy quality monitor as claimed in claim 1 for realizing electric energy quality monitoring and pollution sources positioning, its feature exist In：If industrial computer is run for the first time, all quality of power supply technical parameters are current quality of power supply technical parameter；If industrial computer is non- First operation, all quality of power supply technical parameters are to preserve current quality of power supply technical parameter and whole service period History quality of power supply technical parameter.
- 4. electric energy quality monitoring and the electric energy quality monitoring of pollution sources positioning are realized as claimed any one in claims 1 to 3 Instrument, it is characterised in that：The signal processing apparatus is also associated with the extended menory for preserving sampled data, and for believing Number in-circuit emulation of processing unit and the JTAG emulation interface of download program.
- 5. electric energy quality monitoring and the electric energy quality monitoring of pollution sources positioning are realized as claimed any one in claims 1 to 3 Instrument, it is characterised in that：The system control device is also associated with LCD interfaces, keyboard interface for realizing human-computer dialogue operation.
- 6. it is a kind of based on monitor any one of claim 1 to 5 realize electric energy quality monitoring and pollution sources positioning Method, it is characterised in that comprise the following steps：S1：Signal pickup assembly receives the power network signal of each monitoring point；The A phase voltage waveforms of power network signal are passed through into second-order filter After form sine wave signal, sine wave signal is become by square-wave signal by Zero-cross comparator；Square-wave signal is subjected to level conversion Signal processing apparatus is input to after deburring, de-jitter, is transferred to S2；S2：Signal processing apparatus enters during each rising edge of square-wave signal to interrupt, and is recorded according to interrupting twice in succession Internal pulses number, the frequent rate of net of external electrical network is calculated；By the sample frequency of signal processing apparatus adjust to outside After the net frequency Frequency Synchronization of power network, sampling and Temporal Data analyzing and processing are synchronized, and the stable state waveform data of sampling are sent out System control device is delivered to, is transferred to S3；S3：System control device carries out data analysis to stable state waveform data and obtains quality of power supply technical parameter, and by electric energy matter Amount technical parameter is sent to industrial computer, is transferred to S4；S4：Industrial computer carries out power quality analysis statistics to all quality of power supply technical parameters；Counted according to power quality analysis, Generate various quality of power supply forms；The exceeded parameter of the quality of power supply is obtained from power quality analysis statistics, is surpassed according to the quality of power supply Mark parameter to pollution sources of electrical energy quality carry out location determination, wherein, pollution sources of electrical energy quality include harmonic wave/m-Acetyl chlorophosphonazo pollution sources, It is inclined to fluctuate flickering pollution sources, voltage swells rapid drawdown pollution sources, voltage three-phase imbalance pollution sources, voltage deviation pollution sources, frequency Poor pollution sources.
- 7. the method as claimed in claim 6 for realizing electric energy quality monitoring and pollution sources positioning, it is characterised in that：Described in S4 The exceeded parameter of the quality of power supply is obtained from power quality analysis statistics, according to the exceeded parameter of the quality of power supply to pollution sources of electrical energy quality Location determination is carried out, specifically includes following steps：S401：Electric energy quality harmonic/m-Acetyl chlorophosphonazo index parameter is chosen from power quality analysis statistics, judges that the quality of power supply is humorous Whether ripple/m-Acetyl chlorophosphonazo index parameter is exceeded, if it is not, being directly transferred to S402；If so, the positioning into harmonic wave/m-Acetyl chlorophosphonazo pollution sources Judge：The non-linear resistance degree DR and reactance nonlinearity DX in every loop in the range of 2~50 subharmonic are calculated, is calculated public Formula is：<mrow> <mi>D</mi> <mi>R</mi> <mo>=</mo> <msqrt> <mrow> <munderover> <mi>&Sigma;</mi> <mrow> <mi>h</mi> <mo>=</mo> <mn>2</mn> </mrow> <mi>H</mi> </munderover> <msup> <mrow> <mo>|</mo> <mrow> <mi>R</mi> <mi>h</mi> <mo>/</mo> <mi>R</mi> <mn>1</mn> <mo>-</mo> <mn>1</mn> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> <mo>/</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </msqrt> </mrow><mrow> <mi>D</mi> <mi>X</mi> <mo>=</mo> <msqrt> <mrow> <munderover> <mi>&Sigma;</mi> <mrow> <mi>h</mi> <mo>=</mo> <mn>2</mn> </mrow> <mi>H</mi> </munderover> <msup> <mrow> <mo>|</mo> <mrow> <mi>X</mi> <mi>h</mi> <mo>/</mo> <mi>X</mi> <mn>1</mn> <mo>-</mo> <mn>1</mn> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> <mo>/</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </msqrt> </mrow>In above-mentioned formula, R1 is fundamental wave resistance, and Rh is the h times fundamental wave resistance, and h is the positive integer of 2≤h≤50, and N is the total of harmonic wave Number 50, X1 are fundamental reactance, and Xh is the h times fundamental reactance；When non-linear resistance degree DR and reactance nonlinearity DX level off to 0 when, it is linear load to illustrate the loop load, will not be produced Raw harmonic wave, then the loop is not harmonic wave/m-Acetyl chlorophosphonazo pollution sources；When non-linear resistance degree DR and reactance nonlinearity DX are all higher than 3 When, it is nonlinear-load to illustrate the loop load, then the loop is harmonic wave/m-Acetyl chlorophosphonazo pollution sources, is transferred to S402；S402：Quality of power supply flickering index parameter is chosen from power quality analysis statistics, judges that quality of power supply flickering index is joined Whether number is exceeded, if it is not, being directly transferred to S403；If so, enter the location determination of fluctuation flickering pollution sources：Calculate in every loop Flickering value when load is independently accessed, judge whether flickering value when load is independently accessed in every loop is exceeded, if so, then should Loop is fluctuation flickering pollution sources, is transferred to S403；If it is not, then the loop is not fluctuation flickering pollution sources, S403 is transferred to；S403：Quality of power supply voltage swells rapid drawdown index parameter is chosen from power quality analysis statistics, judges quality of power supply electricity Press in the rapid drawdown index parameter that rises sharply and interrupt transient information with the presence or absence of voltage swells rapid drawdown, if being not present, be directly transferred to S404；If In the presence of into the location determination of voltage swells rapid drawdown pollution sources：Judge system voltage every loop pair when rising sharply rapid drawdown Whether the front and rear 3-5 cycles electric current answered is synchronous change, if so, then the loop is not voltage swells rapid drawdown pollution sources, is transferred to S404；If it is not, then the loop is voltage swells rapid drawdown pollution sources, S404 is transferred to；S404：Quality of power supply voltage three-phase imbalance index parameter is chosen from power quality analysis statistics, judges the quality of power supply Whether voltage three-phase imbalance index parameter is exceeded, if it is not, being directly transferred to S405；If so, polluted into voltage three-phase imbalance The location determination in source：The value and three-phase current unbalance degree of the three-phase current in every loop are analyzed, if a phase or two-phase in loop Load current value be more than oepration at full load electric current 90%, and three-phase current unbalance degree be more than 60%, then judge the loop It is voltage three-phase imbalance pollution sources, is transferred to S405；S405：Quality of power supply voltage deviation index parameter is chosen from power quality analysis statistics, judges that quality of power supply voltage is inclined Whether poor index parameter is exceeded, if it is not, being directly transferred to S406；If so, the location determination into voltage deviation pollution sources：Judge every Bar loop exceedes system nominal capacity with the presence or absence of apparent energy S or load power factor is less than the situation of rated value, if in the presence of, Then the loop is voltage deviation pollution sources, is transferred to S406；If being not present, the loop is not voltage deviation pollution sources, is transferred to S406；S406：Quality of power supply electric voltage frequency index parameter is chosen from power quality analysis statistics, judges quality of power supply voltage frequency Whether rate index parameter is exceeded, if it is not, directly terminating；If so, the location determination into frequency departure pollution sources：Judge that every is returned Road is rated current with the presence or absence of active-power P, apparent energy S situation or the actual motion electric current for exceeding corresponding rated capacity 95% and the big situation of current fluctuation, if in the presence of the loop is frequency departure pollution sources；If being not present, the loop is not It is frequency departure pollution sources, terminates.
- 8. the method as claimed in claim 7 for realizing electric energy quality monitoring and pollution sources positioning, it is characterised in that：Institute in S402 Flickering value when load is independently accessed in every loop of calculating is stated, specifically includes following steps：S402a：Voltage pulsation curve U (t), the current fluctuation curve I (t) in every loop are calculated, is transferred to S402b；S402b：Bring the voltage pulsation curve U (t) being calculated, current fluctuation curve I (t) into instantaneous apparent energy S (t) Calculation formula, obtain voltage and float angleAngle is floated with electric currentS (t) calculation formula is：ω is electrical angle in formula, and t is instantaneous time, is transferred to S402c；S402c：Angle is floated according to voltageAngle is floated with electric currentDerive that load uses impedance model：ZL=R+JX, wherein, R is Resistance, JX are reactance, are transferred to S402d；S402d：If system voltage is Us, system short circuit capacity Sd, then derive that system hinders using impedance model according to load Anti- Zs=Us2/Sd, is transferred to S402e；S402e：According to resistance R, reactance JX, system impedance Zs and system voltage Us, calculate public when load is independently accessed Tie point voltage Ud, calculation formula are：Ud=[(R+JX)/(Zs+R+JX)] × Us, is transferred to S402f；S402f：Points of common connection voltage Ud when being independently accessed according to load, when calculating that load is independently accessed in every loop Flickering value, terminate.
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