CN104635114A - Positioning system and method for electric energy quality disturbance source - Google Patents

Positioning system and method for electric energy quality disturbance source Download PDF

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Publication number
CN104635114A
CN104635114A CN201510097288.3A CN201510097288A CN104635114A CN 104635114 A CN104635114 A CN 104635114A CN 201510097288 A CN201510097288 A CN 201510097288A CN 104635114 A CN104635114 A CN 104635114A
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electric energy
line monitoring
energy quality
disturbance
quality
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CN201510097288.3A
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CN104635114B (en
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庄重
徐国平
王奕
汤耀红
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江苏省电力公司常州供电公司
江苏省电力公司
国家电网公司
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Priority to CN201510097288.3A priority Critical patent/CN104635114B/en
Publication of CN104635114A publication Critical patent/CN104635114A/en
Priority claimed from PCT/CN2015/088612 external-priority patent/WO2016138750A1/en
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Abstract

The invention relates to a positioning system and a positioning method for an electric energy quality disturbance source. The positioning system comprises online electric energy quality monitoring devices, wherein each online electric energy quality monitoring device is connected between every two master electric energy quality management stations through the Ethernet. Each online electric energy quality monitoring device is arranged at a monitoring point of a power transmission line of a radiation type power distribution system, and every two online electric energy quality monitoring devices are connected through the Ethernet; when an actual disturbance event occurs in the system, one of the online electric energy quality monitoring devices detects the disturbance event, then records an occurrence moment of the disturbance source, informs the other online electric energy quality monitoring devices in the network through the Ethernet in a broadcasting way to start a disturbance wave recording system on the basis of the moment, records sampling data of N cycles before the moment and N cycles after the moment, and sends the sampling data to the master electric energy quality management stations in real time; through the mutual cooperation of all the online electric energy quality monitoring devices, a system coverage matrix and a system direction matrix are established, and then the disturbance source is positioned.

Description

A kind of power quality disturbance positioning system and localization method
Technical field
The present invention relates to pollution sources of electrical energy quality on-line monitoring field, be specifically related to positioning system and the localization method of power quality disturbance in a kind of electrical network.
Background technology
In recent years along with the develop rapidly of economy, electric load increases swift and violent, power load increasingly complex and variation, more and more non-linear, that impact, imbalance and harmonic wave are abundant application apparatus accesses electrical network in succession, all can have influence on the quality of power supply of power supply grid to some extent.In addition monitoring means imperfection and operation, external interference and various failure and other reasons, power quality problem becomes increasingly conspicuous.
Current, study hotspot relevant to the quality of power supply in electric system mainly concentrates on the following aspects: the structure, utility power quality control etc. of the identification process of electric energy quality signal, quality of power supply evaluation index, electric energy quality on-line monitoring device and system.But, after quality of power supply event occurs, the location technology of disturbing source is also very important, not only contribute to the reasonable solution of duty goal between power department and user and dispute, and the quality of power supply is formulated to power department to relax and control strategy has important guiding effect.Therefore, be necessary to set up long-range, Centralizing inspection and the analytic system of a set of quality of power supply, on the pollution source affecting the quality of power supply as voltage or electric current temporary liter, to fall and the index such as short interruptions is analyzed temporarily, find out the reason affecting pollution sources of electrical energy quality in time, ensure power grid security, reliable, economical operation.
In current power distribution network, the localization method of power quality disturbance mainly contains following two class methods:
1, based on the decision method of perturbation direction related table.According to the deployment scenarios of network structure in system and electric energy quality on-line monitoring device (PQMD), the perturbation direction relation table in pre-antecedent write through system between disturbing source position and each electric energy quality on-line monitoring device.When there is actual disturbance event in system, carrying out the judgement of perturbation direction according to the measurement data of each monitoring point, and comparing with this related table, realizing positioning function.The shortcoming of the method is: must rely on the artificial location more just carrying out disturbing source, inefficiency.Although can carry out by computer programming the automatic location that automatic analysis realizes disturbing source at present, but (disturbing source on such as other circuit is on the impact of electric energy quality on-line monitoring device in some cases, namely can not make full use of all branch road information and position judgement) when there is fuzzy object disturbing source, accurate location can not be realized, Position location accuracy and fault-tolerant ability poor.
2, based on the character type localization method of the disturbing source direction determining of single measuring point or multi-measuring point.According to the single or multiple electric energy quality on-line monitoring devices arranged in electric system, study the disturbing source direction determining algorithm that various event type is corresponding.Such as, when voltage dip event or harmonic wave event occur in electric system, adopt based on power of disturbance and disturbance energy, based on methods such as equiva lent impedance reals part of symbol, disturbance event can be realized and occur in monitoring point forward direction or backward judgement.Also there is at present the power quality disturbance localization method that scholar proposes based on genetic algorithm on this basis, the method is by the analysis to disturbing signal high fdrequency component mechanism of production, wavelet transformation is utilized to extract high fdrequency component, using the foundation that the polarity of high frequency components energy differentiates as perturbation direction, and according to system topology and monitoring point deployment scenarios, establish disturbance source locating Optimized model, disturbance source locating problem is transformed into Zero-one integer programming problem, adopt genetic algorithm to solve.The shortcoming of the method is: can only determine the front and rear direction of disturbing source relative to this monitoring point, when there is quality of power supply event in electric power networks, really can not realize the accurate location (as navigating to concrete certain circuit) of disturbing source, set up disturbance source locating Optimized model, adopt genetic algorithm to further increase calculated amount and the memory space of electric energy quality on-line monitoring device.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of can realize disturbing source accurately automatically location and automatically eliminate the fuzzy item of disturbing source, efficiency is high, structure is simple, with low cost, the positioning system and the localization method that are easy to the power quality disturbance realizing and dispose.
The technical scheme realizing the object of the invention is to provide a kind of positioning system of power quality disturbance, the electric energy quality on-line monitoring device comprising Power quality management main website and arrange in each monitoring point of the transmission line of electricity of radial pattern distribution system, connected by Ethernet between each electric energy quality on-line monitoring device, be connected by Ethernet between each electric energy quality on-line monitoring device with Power quality management main website; When there is actual disturbance event in system, the moment of disturbing source generation can be recorded after electric energy quality on-line monitoring device detects disturbance event and united for benchmark starts disturbance record wave system with this moment by other electric energy quality on-line monitoring device in Ethernet in a broadcast manner informing network, record the top n cycle in this moment and the sampled data of N number of cycle afterwards, N >=1, and real-time be sent to Power quality management main website; Power quality management main website stores the device number of each electric energy quality on-line monitoring device and the address of monitoring point, place.
Further, the positioning system of described a kind of power quality disturbance also comprises the Ethernet switch supporting IEEE1588 agreement, Power quality management main website supports IEEE1588 agreement, electric energy quality on-line monitoring device is provided with the Ethernet interface supporting IEEE1588 agreement, between Power quality management main website with each electric energy quality on-line monitoring device all by special shielding network connection according to networking after general international standard access network based on ethernet switch, whole system adopt IEEE1588 couple time agreement carry out clock alignment.
The localization method of the positioning system of above-mentioned a kind of power quality disturbance, comprises following several step:
1. according to known distribution system topological structure, be built with radical structural drawing, and identify the positional information of each electric energy quality on-line monitoring device layout points in whole system;
2. whole system set covering theory is set up, according to the correlative positional relation having each node of radical and electric energy quality on-line monitoring device in system, the set covering theory A of definable system l × M, A l × Mcan complete when system initialization:
A i × j = L 1 L 2 . . . L i M 1 M 2 . . . M j a 1 × 1 a 1 × 2 . . . a 1 × j a 2 × 1 a 2 × 2 . . . a 2 × j . . . . . . . . . . . . a i × 1 a i × 2 . . . a i × j ,
Wherein, L is the node total number had in system in radical, the line segment quantity in M correspondence system, is the electric energy quality on-line monitoring device quantity of installing in whole system, matrix A l × Meach data a i × jthe position relationship of a jth electric energy quality on-line monitoring device layout points and i-th electric energy quality on-line monitoring device monitoring point in expression system, the concrete assignment of initialization is: if if L ibe positioned at M jforward region, then make a ij=-1, otherwise; a ij=+1, the M described in system jbackward region refers to that a jth electric energy quality on-line monitoring device arranges the child node region of node and this node; Forward region refers to except backward other node region extra-regional;
3. detect that the electrical network quality of power supply goes wrong or electric current occurs according to the electric energy quality on-line monitoring device at moment point place a certain in system, during the disturbing source events such as voltage jump, this equipment can record moment that disturbing source occurs and by other electric energy quality on-line monitoring device OnNow fault recording system in Ethernet in a broadcast manner informing network, record the top n cycle in this moment and the sampled data of N number of cycle afterwards, N >=1, when using IEEE1588 couple in system between each electric energy quality on-line monitoring device and Power quality management main website, agreement is as the reference time of whole system,
4., after each electric energy quality on-line monitoring device equipment completes the work of record ripple, electric energy quality on-line monitoring device can confirm event type according to the noisy data detected;
5. precise time and the position of disturbing source event generation in the system location information acquisition system stored in the spectrum analysis of waveform and Power quality management main website are recorded by the system set covering theory in this moment sent to Power quality management main website in real time according to each electric energy quality on-line monitoring device in network and the product of system orientation matrix, the mutual comparison of recorded broadcast playback in multiple moment, each institute, and its concrete steps are as follows:
First, upload to the information of main website according to each electric energy quality on-line monitoring device when system set covering theory and generation disturbing source event in real time, set up the direction matrix B in this moment of system m × 1:
B M × 1 = M 1 M 2 . . . M j L 1 b 1 b 2 . . . b j ,
In formula, b jwhen in expression system there is disturbing source event in i-th line segment place, a jth electric energy quality on-line monitoring device equipment is to the result of determination in disturbing source direction, if it is determined that disturbing source is backward disturbance, namely determines after disturbing source event is positioned at a jth electric energy quality on-line monitoring device equipment, then make b j=+1; Otherwise, b j=-1; b jvalue with markers, real time data information that Power quality management main website then can be uploaded by each electric energy quality on-line monitoring device sets up the system orientation matrix that disturbing source event time occurs;
B La 2 = + 1 - 1 - 1 - 1 B La 3 = + 1 + 1 - 1 - 1 ;
Then, the system orientation matrix in system set covering theory and this moment is carried out matrix multiplication operation, obtains matrix of consequence C l × 1for:
C L × 1 = A L × M × B M × 1 = L 1 L 2 . . . L i c 1 c 2 . . . c i ,
Each element c in matrix of consequence ivalue relevant with the concrete layout situation of electric power networks topological structure and electric energy quality on-line monitoring device, according to c ithe absolute value of value whether equal the element number of the quantity of the electric energy quality on-line monitoring device arranged in system, if equal, confirm this moment this row element c icorresponding line segment L ifor power quality disturbance;
Finally, after having had preliminary disturbance source locating information, c has been passed through ivalue determine at concrete electric energy quality on-line monitoring device layout points and concrete line segment, the wave record playback function being sent to this moment of Power quality management main website again by each electric energy quality on-line monitoring device is compared and is eliminated the fuzzy item of disturbing source and precise time, then can obtain by the positional information be stored on Power quality management main website or electric energy quality on-line monitoring device equipment the specified place that disturbing source event occurs.
Further, step 1. in, the deployment scenarios of each electric energy quality on-line monitoring device in system is identified according to the device address of electric energy quality on-line monitoring device, this table is stored in the database of Power quality management main website, also can store the positional information of residing layout points as required in each electric energy quality on-line monitoring device.
Further, 4. step confirms that the concrete grammar of disturbance event type is: the transient power quality disturbance signal gathering each monitoring point in electrical network, obtains each monitoring point transient power quality disturbance voltage signal and current signal after filtering; Form un-decimated wavelet transform is adopted to carry out 2 layers of decomposition to the transient power quality disturbance voltage signal of each monitoring point, obtain second layer form un-decimated wavelet transform detail coefficients y2, if the modulus maximum of detail coefficients y2 is greater than threshold value, then this place, monitoring point branch road is defined as the branch road affected by transient power quality disturbance, and threshold value will be exceeded in the modulus maximum of detail coefficients y2 point and two of lie farthest away time points are defined as start/stop time t1, t2 that disturbance occurs; Fundamental frequency amplitude Characteristics V, wave form distortion durations number feature H, the disturbance zero crossing number of times feature O that window fourier transform extracts disturbing signal is carried out on the transient power quality disturbance voltage signal of the monitoring point on the branch road affected by transient power quality disturbance determined; S-transformation is carried out to transient power quality disturbance voltage signal, extracts maximum amplitude fluctuation characteristic Z and the disturbing signal time-frequency deviation characteristics B of disturbing signal; Irregularity of wave form threshold value when wherein extracting wave form distortion durations number feature H is set as 0.01; Compare with binary threshold matrix after these five features are carried out binary coding, identify the type of disturbing signal, types maximum for occurrence number in each monitoring point recognition result is defined as disturbance type simultaneously.
The present invention has positive effect: when (1) the invention provides one based on Ethernet pair, the distributed of multiple spot monitoring can be carried out, the electric energy quality monitoring system of Multi computer cooperation, carry out clock alignment by agreement unification during IEEE 1588 couples between each electric energy quality on-line monitoring device in system and replace traditional dependence GPRS calibrating mode, disturbed depth is carried out according to the markers that multi-measuring point electric energy quality on-line monitoring device records, system set covering theory and system orientation matrix are set up in the cooperations such as information broadcasting and record ripple coupling, Power quality management main website can according to the time in each moment, power/current direction and by simple with time target matrix algorithms (system set covering theory and with time target system orientation matrix carry out matrix multiplication), between each electric energy quality on-line monitoring device record the mutual comparison of waveform and each record waveform spectrum analysis to realize disturbing source accurately location and automatically eliminate the fuzzy item of disturbing source automatically, efficiency is high, structure is simple, with low cost, be easy to distribution network electric energy quality disturbance source locating system and the method thereof of realization and deployment.
(2) the present invention is in conjunction with the disturbing signal of monitoring point multiple in electrical network, detects, discriminance analysis to power quality disturbance, the output disturbance duration, the results such as disturbance type, and its result is accurately comprehensive; Simultaneously owing to monitor and analyzing the information of multiple monitoring point, the accurate location of disturbing source can be realized, be convenient to clear and definite accident responsibility side and improvement electrical energy power quality disturbance problem; The quality of power supply information that determination and analysis goes out is sent to the medium-term and long-term preservation of system main website by Ethernet, be convenient to the data comprehensively recording electrical energy power quality disturbance, administrative authority is facilitated to understand required electrical energy power quality disturbance for information about fast, intuitively, further strengthening quality of power supply restricted mechanism work, for power quality problem improvement and assessment provides truly, information accurately, for the electric power system building a large-scale high-quality provides policy-making data.
(3) the present invention is in Disturbance Detection with in identifying, adopt form un-decimated wavelet transform quick and precisely can detect the start/stop time of disturbance, and determine the branch road by disturbing influence, the scope of subsequent analysis can be reduced, make disturbing source determination method of the present invention more simple, quick, effective.Have radical and system disturbance direction matrix by setting up, simplify and calculate, electric energy quality on-line monitoring device carries out disturbance source locating automatically, and efficiency is high, can deblurring item by the mutual coordination between electric energy quality on-line monitoring device.
(4) the present invention is in disturbed depth, combined window Fourier transform (WDFT) and S-transformation, the characteristic quantity that five can reflect different transient disturbance sources feature can be extracted simultaneously, and obtain 8 vector of binary features after binary coding is carried out to it, identify disturbance event type fast by these 8 vector of binary features and binary threshold matrix being compared.Due to the recognition result in conjunction with multiple monitoring point, mistake that indivedual monitoring point in system is caused due to factors such as very noisies can be avoided the interference of miscellaneous equipment recognition result and the fuzzy item of disturbing source, many places disturbing source can be monitored simultaneously, and then guarantee the correctness of disturbance type identification.
(5) the present invention uses unified IEEE1588 agreement to carry out clock alignment between each electric energy quality on-line monitoring device and main website, and accurately location is divided into two steps: 1) system Primary Location: according to type and the orientation of the direction matrix preliminary judgement disturbing source of system set covering theory and system that disturbing source event time occurs, 2) electric energy quality on-line monitoring device physical equipment cooperates auxiliary positioning mutually: voltage sag source localization method only needs the voltage phase angle measuring monitoring point, current amplitude and phase angle, by judging that the voltage dip generation moment changed polarity of real current component determines disturbing source and monitoring point relative position, in comprehensive electrical network, multiple monitoring point is to the analysis result in this moment, each record waveform spectrum analysis and each electric energy quality on-line monitoring device positional information of system of being stored in Power quality management main website can determine the exact position in voltage Sag Disturbance source, further deblurring item, the method calculates simple, precision can reach ns rank.
Accompanying drawing explanation
Fig. 1 is system architecture topological diagram of the present invention;
Fig. 2 represents the rooted tree that the topological structure shown in Fig. 1 builds for A phase;
Fig. 3 is disturbance source locating schematic diagram of the present invention.
Embodiment
(embodiment 1)
See Fig. 1, the positioning system of the power quality disturbance of the present embodiment comprises the Power quality management main website supporting IEEE1588 agreement, with electric energy quality on-line monitoring device (PQMD) electric energy quality on-line monitoring device of the Ethernet interface of support IEEE1588 agreement, support the Ethernet switch of IEEE1588 agreement, in each monitoring point of the transmission line of electricity of radial pattern distribution system, an electric energy quality on-line monitoring device is set, connected by Ethernet between each electric energy quality on-line monitoring device, be connected by Ethernet between each electric energy quality on-line monitoring device with Power quality management main website, specifically, between Power quality management main website with each electric energy quality on-line monitoring device all by special shielding network connection according to networking after general international standard access network based on ethernet switch, what electric energy quality on-line monitoring device described in the present embodiment (PQMD) adopted is the model that Wuxi You electricity Science and Technology Ltd. manufactures is the electric energy quality on-line monitoring device of YPM-01.When there is actual disturbance event in system, the moment of disturbing source generation can be recorded after electric energy quality on-line monitoring device detects disturbance event and united for benchmark starts disturbance record wave system with this moment by other electric energy quality on-line monitoring device in Ethernet in a broadcast manner informing network, record the top n cycle in this moment and the sampled data of N number of cycle afterwards, N >=1, and real-time be sent to Power quality management main website, system set covering theory and system orientation matrix is set up by mutually cooperating between each electric energy quality on-line monitoring device, for the display of interface squiggle, the ready for analysis of deblurring item and power quality parameter during disturbance source locating.Power quality management main website stores the device number of each electric energy quality on-line monitoring device and the address of monitoring point, place, and during whole system employing IEEE1588 couple, agreement carries out clock alignment.
See Fig. 3, the localization method applying the positioning system of above-mentioned power quality disturbance comprises following several step:
1. according to known distribution system topological structure, building one conventionally in electric system has radical structural drawing, and identifies the positional information of each electric energy quality on-line monitoring device layout points in whole system.In the present embodiment, the topological structure of the system according to Fig. 1, construct a rooted tree structural drawing commonly used in Power System Analysis, and identify the deployment scenarios of each electric energy quality on-line monitoring device in system according to the device address (stack address) of electric energy quality on-line monitoring device.This table is stored in the database of Power quality management main website, also can store the positional information of residing layout points as required in each electric energy quality on-line monitoring device, makes decision to analyze use for disturbance source locating.
2. whole system set covering theory is set up, according to the correlative positional relation having each node of radical and electric energy quality on-line monitoring device in system, the set covering theory A of definable system l × M, A l × Mcan complete when system initialization:
A i × j = L 1 L 2 . . . L i M 1 M 2 . . . M j a 1 × 1 a 1 × 2 . . . a 1 × j a 2 × 1 a 2 × 2 . . . a 2 × j . . . . . . . . . . . . a i × 1 a i × 2 . . . a i × j ,
Wherein, L is the node total number had in system in radical, the line segment quantity in M correspondence system, is the electric energy quality on-line monitoring device quantity of installing in whole system, matrix A l × Meach data a i × jthe position relationship of a jth electric energy quality on-line monitoring device layout points and i-th electric energy quality on-line monitoring device monitoring point in expression system, the concrete assignment of initialization is: if if L ibe positioned at M jforward region, then make a ij=-1, otherwise; a ij=+1, the M described in system jbackward region refers to that a jth electric energy quality on-line monitoring device arranges the child node region of node and this node; Forward region refers to except backward other node region extra-regional.
In the present embodiment, root node be shown in Fig. 2 in first electric energy quality on-line monitoring device on each circuit, equipment below adds this successively to be had in radical.Wherein each electric energy quality on-line monitoring device sequence number (also setting up tables of data between sequence number and device address) is consistent with the corresponding line segment sequence number in topological structure shown in Fig. 1.L airepresent the line segment sequence number in this system, P irepresent the sequence number of electric energy quality on-line monitoring device equipment.
System set covering theory is set up according to there being the relative orientation relation of each node and electric energy quality on-line monitoring device in radical.
As shown in Figure 2: at power transmission line L ainterior joint number is 9, and also namely the line segment quantity of this distribution monitoring system is 9, and sequence number is followed successively by L a1~ L a9, the electric energy quality on-line monitoring device quantity of system actual disposition is 4.Definable system set covering theory A accordingly 9 × 4, matrix A 9 × 4each a ijthe position relationship of a jth electric energy quality on-line monitoring device layout points and i-th node in expression system, if L aibe positioned at P jforward region, then make a ij=-1; Otherwise, a ij=+1.
According to the relative orientation relation having each node of radical and electric energy quality on-line monitoring device in system, can to the system set covering theory A of definition 9 × 4carry out initialize:
A 9 × 4 = + 1 + 1 + 1 + 1 - 1 + 1 + 1 + 1 - 1 - 1 + 1 + 1 - 1 - 1 - 1 + 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 .
3. detect that the electrical network quality of power supply goes wrong or electric current occurs according to the electric energy quality on-line monitoring device at moment point place a certain in system, during the disturbing source events such as voltage jump, this equipment can record moment that disturbing source occurs and by other electric energy quality on-line monitoring device OnNow fault recording system in Ethernet in a broadcast manner informing network, record the top n cycle in this moment and the sampled data of N number of cycle afterwards, N >=1, when using IEEE1588 couple in system between each electric energy quality on-line monitoring device and Power quality management main website, agreement is as the reference time of whole system, for the display of interface squiggle, eliminating the fuzzy item of disturbing source and Power quality management main website during disturbance source locating, to carry out data analysis ready.
N=8 in the present embodiment, detects disturbing source event once electric energy quality on-line monitoring device, the recording and broadcasting system in electric energy quality on-line monitoring device record this moment before the sampled data of 8 cycles and 8 cycles afterwards.
See Fig. 1, suppose that the electric energy quality on-line monitoring device at A point place finds that the electrical network quality of power supply goes wrong or electric current occurs, during voltage jump, this equipment can be recorded the moment of disturbing source generation and be united by the timely startup separator record of other electric energy quality on-line monitoring device in Ethernet in a broadcast manner informing network wave system, after each electric energy quality on-line monitoring device receives broadcasting command, start 8 cycles before recorded broadcast function records this moment and afterwards 8 cycles sampled data and the waveform recorded is sent to Power quality management main website, in system, between each electric energy quality on-line monitoring device and Power quality management main website, unification uses IEEE1588 agreement to carry out clock alignment, this clock accuracy can reach ns level, for when the display of interface squiggle and next step disturbance source locating, power quality parameter analysis and decision is ready.
4. after each electric energy quality on-line monitoring device equipment completes the work of record ripple, electric energy quality on-line monitoring device can confirm event type according to the noisy data detected: the transient power quality disturbance signal gathering each monitoring point in electrical network, obtains each monitoring point transient power quality disturbance voltage signal and current signal after filtering; Form un-decimated wavelet transform is adopted to carry out 2 layers of decomposition to the transient power quality disturbance voltage signal of each monitoring point, obtain second layer form un-decimated wavelet transform detail coefficients y2, if the modulus maximum of detail coefficients y2 is greater than threshold value, then this place, monitoring point branch road is defined as the branch road affected by transient power quality disturbance, and threshold value will be exceeded in the modulus maximum of detail coefficients y2 point and two of lie farthest away time points are defined as start/stop time t1, t2 that disturbance occurs; Fundamental frequency amplitude Characteristics V, wave form distortion durations number feature H, the disturbance zero crossing number of times feature O that window fourier transform extracts disturbing signal is carried out on the transient power quality disturbance voltage signal of the monitoring point on the branch road affected by transient power quality disturbance determined; S-transformation is carried out to transient power quality disturbance voltage signal, extracts maximum amplitude fluctuation characteristic Z and the disturbing signal time-frequency deviation characteristics B of disturbing signal; Irregularity of wave form threshold value when wherein extracting wave form distortion durations number feature H is set as 0.01; Compare with binary threshold matrix after these five features are carried out binary coding, identify the type of disturbing signal, types maximum for occurrence number in each monitoring point recognition result is defined as disturbance type simultaneously;
5. precise time and the position of disturbing source event generation in the system location information acquisition system stored in the spectrum analysis of waveform and Power quality management main website are recorded by the system set covering theory in this moment sent to Power quality management main website in real time according to each electric energy quality on-line monitoring device in network and the product of system orientation matrix, the mutual comparison of recorded broadcast playback in multiple moment, each institute, and its concrete steps are as follows:
First, upload to the information of main website according to each electric energy quality on-line monitoring device when system set covering theory and generation disturbing source event in real time, set up the direction matrix B in this moment of system m × 1:
B M × 1 = M 1 M 2 . . . M j L 1 b 1 b 2 . . . b j ,
In formula, b jwhen in expression system there is disturbing source event in i-th line segment place, a jth electric energy quality on-line monitoring device equipment is to the result of determination in disturbing source direction, if it is determined that disturbing source is backward disturbance, namely determines after disturbing source event is positioned at a jth electric energy quality on-line monitoring device equipment, then make b j=+1; Otherwise, b j=-1.B jvalue with markers, real time data information that Power quality management main website then can be uploaded by each electric energy quality on-line monitoring device sets up the system orientation matrix that disturbing source event time occurs.
In the present embodiment, when transmission line of electricity generation electrical energy power quality disturbance event, each electric energy quality on-line monitoring device all can monitor noisy data, after disturbing source event is confirmed, each electric energy quality on-line monitoring device can determine the front and back relative position relation of disturbing source and this electric energy quality on-line monitoring device layout points according to system orientation matrix.
Accordingly, the direction matrix B of definable native system 4 × 1, matrix B 4 × 1in each data b ijrepresent system neutral section L aiduring upper generation disturbing source event, sequence number is that the electric energy quality on-line monitoring device of Pj determines disturbing source and its front and back relative position relation according to respective algorithms such as power/current directions.If forward direction disturbance, then make b j=-1; Otherwise, b j=+1.
Shown in Fig. 2, suppose respectively at circuit L a2, L a3there is electrical energy power quality disturbance event, according to aforementioned rule, to system disturbance direction matrix B corresponding in two kinds of situations la2, B la3assignment is as follows:
B La 2 = + 1 - 1 - 1 - 1 B La 3 = + 1 + 1 - 1 - 1 ;
Then, the system orientation matrix in system set covering theory and this moment is carried out matrix multiplication operation, obtains matrix of consequence C l × 1for:
C L × 1 = A L × M × B M × 1 = L 1 L 2 . . . L i c 1 c 2 . . . c i ,
Each element c in matrix of consequence ivalue relevant with the concrete layout situation of electric power networks topological structure and electric energy quality on-line monitoring device, according to c ithe absolute value of value whether equal the element number of the quantity of the electric energy quality on-line monitoring device arranged in system, if equal, confirm this moment this row element c icorresponding line segment L ifor power quality disturbance.
As in the present embodiment, on the electric energy quality on-line monitoring device at B, C and D place record wave system system all record A point place occur curtage sudden change time oscillogram and the moment, there is the moment in the disturbing source that the time in the oscillogram that main website uploads by B, C and D place electric energy quality on-line monitoring device accurately orients A point place, can obtain C according to formulae discovery l2, C l3for:
C L 2 = - 2 - 4 - 2 - 2 2 2 2 2 2 , C L 3 = 0 - 2 - 4 - 3 0 0 0 0 0 ,
Matrix of consequence C l × 1in each element c iabsolute value contain the information judging power quality disturbance.C l2in the second row and C l3the absolute value of the third line element equals the quantity of installing electric energy quality on-line monitoring device checkout equipment in system, can this moment of preliminary judgement circuit L a2, L a3upper have electrical energy power quality disturbance event to occur simultaneously.
Finally, after having had preliminary disturbance source locating information, c has been passed through ivalue determine at concrete electric energy quality on-line monitoring device layout points and concrete line segment, the wave record playback function being sent to this moment of Power quality management main website again by each electric energy quality on-line monitoring device is compared and is eliminated the fuzzy item of disturbing source and precise time, then can obtain by the positional information be stored on Power quality management main website or electric energy quality on-line monitoring device equipment the specified place that disturbing source event occurs.

Claims (5)

1. the positioning system of a power quality disturbance, it is characterized in that: the electric energy quality on-line monitoring device comprising Power quality management main website and arrange in each monitoring point of the transmission line of electricity of radial pattern distribution system, connected by Ethernet between each electric energy quality on-line monitoring device, be connected by Ethernet between each electric energy quality on-line monitoring device with Power quality management main website; When there is actual disturbance event in system, the moment of disturbing source generation can be recorded after electric energy quality on-line monitoring device detects disturbance event and united for benchmark starts disturbance record wave system with this moment by other electric energy quality on-line monitoring device in Ethernet in a broadcast manner informing network, record the top n cycle in this moment and the sampled data of N number of cycle afterwards, N >=1, and real-time be sent to Power quality management main website; Power quality management main website stores the device number of each electric energy quality on-line monitoring device and the address of monitoring point, place.
2. the positioning system of a kind of power quality disturbance according to claim 1, it is characterized in that: also comprise the Ethernet switch supporting IEEE1588 agreement, Power quality management main website supports IEEE1588 agreement, electric energy quality on-line monitoring device is provided with the Ethernet interface supporting IEEE1588 agreement, between Power quality management main website with each electric energy quality on-line monitoring device all by special shielding network connection according to networking after general international standard access network based on ethernet switch, whole system adopt IEEE1588 couple time agreement carry out clock alignment.
3. the localization method of the positioning system of a kind of power quality disturbance as claimed in claim 2, is characterized in that comprising following several step:
1. according to known distribution system topological structure, be built with radical structural drawing, and identify the positional information of each electric energy quality on-line monitoring device layout points in whole system;
2. whole system set covering theory is set up, according to the correlative positional relation having each node of radical and electric energy quality on-line monitoring device in system, the set covering theory A of definable system l × M, A l × Mcan complete when system initialization:
Wherein, L is the node total number had in system in radical, the line segment quantity in M correspondence system, is the electric energy quality on-line monitoring device quantity of installing in whole system, matrix A l × Meach data a i × jthe position relationship of a jth electric energy quality on-line monitoring device layout points and i-th electric energy quality on-line monitoring device monitoring point in expression system, the concrete assignment of initialization is: if if L ibe positioned at M jforward region, then make a ij=-1, otherwise; a ij=+1, the M described in system jbackward region refers to that a jth electric energy quality on-line monitoring device arranges the child node region of node and this node; Forward region refers to except backward other node region extra-regional;
3. detect that the electrical network quality of power supply goes wrong or electric current occurs according to the electric energy quality on-line monitoring device at moment point place a certain in system, during the disturbing source events such as voltage jump, this equipment can record moment that disturbing source occurs and by other electric energy quality on-line monitoring device OnNow fault recording system in Ethernet in a broadcast manner informing network, record the top n cycle in this moment and the sampled data of N number of cycle afterwards, N >=1, when using IEEE1588 couple in system between each electric energy quality on-line monitoring device and Power quality management main website, agreement is as the reference time of whole system,
4., after each electric energy quality on-line monitoring device equipment completes the work of record ripple, electric energy quality on-line monitoring device can confirm event type according to the noisy data detected;
5. precise time and the position of disturbing source event generation in the system location information acquisition system stored in the spectrum analysis of waveform and Power quality management main website are recorded by the system set covering theory in this moment sent to Power quality management main website in real time according to each electric energy quality on-line monitoring device in network and the product of system orientation matrix, the mutual comparison of recorded broadcast playback in multiple moment, each institute, and its concrete steps are as follows:
First, upload to the information of main website according to each electric energy quality on-line monitoring device when system set covering theory and generation disturbing source event in real time, set up the direction matrix B in this moment of system m × 1:
In formula, b jwhen in expression system there is disturbing source event in i-th line segment place, a jth electric energy quality on-line monitoring device equipment is to the result of determination in disturbing source direction, if it is determined that disturbing source is backward disturbance, namely determines after disturbing source event is positioned at a jth electric energy quality on-line monitoring device equipment, then make b j=+1; Otherwise, b j=-1; b jvalue with markers, real time data information that Power quality management main website then can be uploaded by each electric energy quality on-line monitoring device sets up the system orientation matrix that disturbing source event time occurs;
B La 2 = + 1 - 1 - 1 - 1 , B La 3 = + 1 + 1 - 1 - 1 ;
Then, the system orientation matrix in system set covering theory and this moment is carried out matrix multiplication operation, obtains matrix of consequence C l × 1for:
C L × 1 = A L × M × B M × 1 = L 1 L 2 . . . L i c 1 c 2 . . . c i ,
Each element c in matrix of consequence ivalue relevant with the concrete layout situation of electric power networks topological structure and electric energy quality on-line monitoring device, according to c ithe absolute value of value whether equal the element number of the quantity of the electric energy quality on-line monitoring device arranged in system, if equal, confirm this moment this row element c icorresponding line segment L ifor power quality disturbance;
Finally, after having had preliminary disturbance source locating information, c has been passed through ivalue determine at concrete electric energy quality on-line monitoring device layout points and concrete line segment, the wave record playback function being sent to this moment of Power quality management main website again by each electric energy quality on-line monitoring device is compared and is eliminated the fuzzy item of disturbing source and precise time, then can obtain by the positional information be stored on Power quality management main website or electric energy quality on-line monitoring device equipment the specified place that disturbing source event occurs.
4. the localization method of the positioning system of a kind of power quality disturbance according to claim 3, it is characterized in that: step 1. in, the deployment scenarios of each electric energy quality on-line monitoring device in system is identified according to the device address of electric energy quality on-line monitoring device, this table is stored in the database of Power quality management main website, also can store the positional information of residing layout points as required in each electric energy quality on-line monitoring device.
5. the localization method of the positioning system of a kind of power quality disturbance according to claim 3, it is characterized in that: 4. step confirms that the concrete grammar of disturbance event type is: the transient power quality disturbance signal gathering each monitoring point in electrical network, obtains each monitoring point transient power quality disturbance voltage signal and current signal after filtering; Form un-decimated wavelet transform is adopted to carry out 2 layers of decomposition to the transient power quality disturbance voltage signal of each monitoring point, obtain second layer form un-decimated wavelet transform detail coefficients y2, if the modulus maximum of detail coefficients y2 is greater than threshold value, then this place, monitoring point branch road is defined as the branch road affected by transient power quality disturbance, and threshold value will be exceeded in the modulus maximum of detail coefficients y2 point and two of lie farthest away time points are defined as start/stop time t1, t2 that disturbance occurs; Fundamental frequency amplitude Characteristics V, wave form distortion durations number feature H, the disturbance zero crossing number of times feature O that window fourier transform extracts disturbing signal is carried out on the transient power quality disturbance voltage signal of the monitoring point on the branch road affected by transient power quality disturbance determined; S-transformation is carried out to transient power quality disturbance voltage signal, extracts maximum amplitude fluctuation characteristic Z and the disturbing signal time-frequency deviation characteristics B of disturbing signal; Irregularity of wave form threshold value when wherein extracting wave form distortion durations number feature H is set as 0.01; Compare with binary threshold matrix after these five features are carried out binary coding, identify the type of disturbing signal, types maximum for occurrence number in each monitoring point recognition result is defined as disturbance type simultaneously.
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