CN102680784A - United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers - Google Patents
United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers Download PDFInfo
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Abstract
The invention discloses a united low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers, comprising the following steps of: selecting one from the wide area measurement systems of the multiple dispatching centers as a united oscillation monitoring main station, and taking the wide area measurement systems of other dispatching centers as sub-stations; when any sub-station or main station monitors low-frequency oscillation, triggering total network united low-frequency oscillation analysis; performing spectrum analysis on respective measurement points by each sub-station, and gathering analysis results to the main station to perform modal analysis such as coherency clustering of oscillation nodes of the total network and calculation of the relative contribution degree of each node to oscillation; returning the global results of analysis to each sub-station and performing visual display in the form of renderings. By the method, the wide area measurement system of each dispatching center can timely know detailed oscillation modal information of a low-frequency oscillation event influencing own grid, such as oscillation range, node clustering situation, interface position, degree of participation of own grid unit in oscillation, and the like.
Description
Technical field
The invention belongs to the power system safety and stability analysis technical field, particularly a kind of WAMS of many dispatching centers carries out the content of associating low-frequency oscillation on-line monitoring.
Background technology
Low-frequency oscillation of electric power system be electric system after suffering disturbance, what generator amature take place to continue waves relatively, causes active power in these units and the phenomenon that connects generating period property vibration on the transmission line of electricity of these units.Whether the generator of participating in vibration can roughly be divided into two homology groups (unit in the homology group has akin orientation of oscillation) greater than 90 ° according to the absolute value of the relative phase at rotor merit angle, and the cut set of the transmission line of electricity between these two groups of units can constitute the interphase of low frequency power oscillation.
Existing WAMS only carries out the low-frequency oscillation analysis based on the information that the dispatching center, place collects.Yet; In interconnected network; Unit results of interaction in a lot of a plurality of often control areas of low-frequency oscillation incident, the unit of participating in vibration is distributed in the zone that a plurality of dispatching center is administered, and on the network of relevant dispatcher-controlled territory, all can monitor vibration.But; Whole compasss of competency of provincial dispatching center are in a certain homology group fully probably; The operations staff in zone hereto, only rely on the one's respective area information its can not know that its low-frequency oscillation that monitors is the vibration of which unit to which unit, the vibration interphase is where; The degree which unit is participated in is relatively large, therefore can't make correct control decision.And transfer for economizing the upper level dispatcher network forming of transferring, though the scope of its administration is bigger, can observe two groups of units of participating in vibration usually, often can not observe all units of participating in vibration fully.Observe infull reason; Probably there are two types; The one, the unit of subparticipation vibration is positioned at other nets with relevant transformer station circuit and transfers compass of competency; The 2nd, transfer for net, have only and deliver to the net accent on fairly large power plant and the 500kV transformer station information, transformer station and the measurement information on the circuit less when power plant's capacity and 220kV are not delivered to the net accent usually.Though therefore net is transferred because observation scope is big; Therefore vibration mode is had outside the more comprehensive understanding; But because observation information is not comprehensive; Especially lack the less unit of part low-voltage grade or capacity and participate in the vibration situation, therefore can not make evaluation, thereby also just be difficult to make concrete control decision to unit to the degree that concrete unit participates in vibrating.
In sum; It is thus clear that for big interval vibration; The wide area measurement information that often need combine other subdispatch centers and low-voltage grade dispatching center; Could confirm the mode of scope, the vibration of vibration, the relative size of vibration interphase, each unit or node degree of participation in vibration, and according to these information to concrete unit exert oneself or cut-offfing of circuit made correct control decision.Also there is not document that the problems referred to above are provided solution at present.
This patent method provides that many dispatching centers WAMS is collaborative to carry out low-frequency oscillation monitoring method, makes each dispatching center's WAMS all can in time know the situation of hiving off, vibration interphase, self electrical network unit of scope, the vibration unit of the vibration detailed vibration modal informations such as Relative Contribution degree to vibration to the low-frequency oscillation incident that has influence on self electrical network.For this reason, the characteristics to this type of low-frequency oscillation stable problem provide the information content that needs exchange between different grid dispatching center, the time requirement of exchange message; And combining the information obtained from other electrical networks, how each main website makes reasoning and judging.
Summary of the invention
When low-frequency oscillation takes place on a large scale; In order to make at different levels, each subdispatch center that vibration is involved can both in time know the global mode and the degree of participation of each regional unit in integral oscillation of vibration, the invention discloses a kind of many dispatching centers WAMS of realizing and low-frequency oscillation is on a large scale carried out the method for combined monitoring and analysis.
The following technical scheme of the concrete employing of the present invention.
A kind of many dispatching centers WAMS associating low-frequency oscillation monitoring method; This method is in the WAMS of a plurality of dispatching centers; Select one for uniting vibration supervision main website; The WAMS of all the other dispatching centers is the substation, when any substation or main website monitor low-frequency oscillation when taking place, triggers the whole network associating low-frequency oscillation and analyzes; It is characterized in that, said method comprising the steps of:
Step 1: in the WAMS at the subdispatch center that all participation associating low-frequency oscillations are monitored, select 1 as associating low-frequency oscillation monitoring main website, the WAMS of all the other dispatching centers is as associating low-frequency oscillation monitoring sub-station;
Step 2: main website needs to send the measurement amount of main website to select to each substation of participating in associating low-frequency oscillation monitoring; Generally include nodal frequency, node injecting power and can equivalent be the line power of node injecting power; Vibration record threshold value, oscillating alarm threshold value and oscillating alarm to the different classes of measurement of each electric pressure finish threshold value, and lasting accordingly periodicity threshold value is configured; About being defined as follows of each threshold value:
A) vibration record threshold value: when oscillation amplitude surpassed this threshold value, the substation record was to the analysis result of vibration.
B) starting of oscillation alarm threshold: when oscillation amplitude surpassed this threshold value first, starting of oscillation information was sent to main website in the substation;
C) oscillating alarm finishes threshold value: when oscillation amplitude progressively reduces from the starting of oscillation alarm threshold, and when being lower than this threshold value, the vibration ending message is sent to main website in the substation.
Step 3: the WAMS at each subdispatch center; The low-frequency oscillation monitoring is independently carried out in i.e. associating low-frequency oscillation monitoring main website and substation; Supervision is from the real-time dynamic data of this dispatching center's basic platform; Real-time analysis measurement amount, i.e. the oscillating characteristic parameter of the monitored element electric parameters of appointment (said monitored element electric parameters is meant nodal frequency, transformer high-voltage side active power or can equivalent be the line power of node injecting power), said oscillating characteristic parameter comprises frequency, the amplitude of vibration; Phase place, damping etc.;
Step 4: WAMS when each subdispatch center; The oscillation amplitude of oscillationg component that i.e. associating low-frequency oscillation monitoring main website and substation detect a certain frequency of certain measurement amount surpasses the vibration that this classification of relevant voltage grade measures and writes down threshold value; And the duration reaches and continues the periodicity threshold value; Then low-frequency oscillation amplitude is first surpassed the initial moment of the moment of said vibration record threshold value as vibration; Each whole second subsequently, information such as the frequency of record low-frequency oscillation, amplitude, phase place, damping were to each subdispatch center real-time data base separately;
Step 5: WAMS when each subdispatch center; I.e. associating low-frequency oscillation monitoring main website and substation detect the oscillation amplitude of oscillationg component of a certain frequency of certain measurement amount above the oscillating alarm threshold value; And the duration reaches and continues the periodicity threshold value; Then produce quick low-frequency oscillation alarm on the spot and with sending associating low-frequency oscillation monitoring main website on the warning information; Before the local alarm of this vibration disappeared, this measurement amount and other measurement amounts and this mode frequency differed the vibration less than 10%, no longer repeat alarm;
Step 6: associating low-frequency oscillation monitoring main website is after the local alarm of the vibration that receives substation or main website; Will with 0.5 second in zero-times of the local alarm of other vibrations that receives compare; Be as the criterion with the frequency of oscillating alarm zero-time measurement amount the earliest and generate a new vibration overall situation alarm event; The frequency of all the other local alarm events that vibrate is if differ in ± 10% with the frequency of this overall alarm event that vibrates, then think the incident that causes the local alarm of vibration actual with the incident that causes the alarm of the vibration overall situation be same vibration incident; To remaining and overall alarm event frequency difference greater than the local alarm event of ± 10% vibration; Think that these local alarm events that vibrate are not caused by the overall alarm event of aforementioned vibration; Oscillation frequency with zero-time alarm the earliest in the local alarm of these residues is as the criterion; Generate a new vibration overall situation alarm event once more; And whether differ in ± 10% with the frequency of the new vibration overall situation alarm event that generates once more according to the frequency of measurement amount in other local alarm event that vibrates; Judge whether other local alarm event that vibrates causes that by the new vibration overall situation alarm event that generates once more the local alarm event that promptly vibrates is actually by same overall vibration incident with the overall alarm event of vibration and causes.The rest may be inferred, finds out all mode of oscillation of the whole network and corresponding overall alarm event thereof, and distribute overall alarm event ID, and send the overall alarm event start information of current vibration to each subdispatch center WAMS of participating in associating low-frequency oscillation monitoring;
Step 7: each participates in substation and the main website of associating low-frequency oscillation monitoring after receiving certain overall alarm event start information that vibrates; To sending the measurement amount of main website to carry out spectrum analysis on the needs selected in the step 2; And with among the spectrum analysis result to should vibrate the initial moment of overall situation alarm and subsequently whole second constantly with overall alarm vibration frequency frequency difference ± 10% with interior and frequency difference is minimum, and the spectrum analysis result that oscillation amplitude surpasses vibration record threshold value sends to main website; Step 8: after associating low-frequency oscillation monitoring main website receives the analysis of the oscillation result who returns about each overall each measurement amount of alarm vibration incident the whole network; Immediately corresponding vibration incident is carried out the comprehensive model analysis of the whole network; Comprise the vibration node coherence grouping; And confirm the relative size of each node to the vibration contribution, comprise following substep:
A) be benchmark with the phase place of the maximum measurement amount of the corresponding mode of oscillation oscillation amplitude of nodal frequency or injection active power constantly at each; When the phase place of all the other nodal frequencies or the corresponding mode of oscillation of injection active power and reference phase differ within ± 90 °; Respective nodes belongs to same homology group, otherwise belongs to opposite homology group;
B) homology group is carried out visual playing up after, from the area between two homology groups, find the vibration interphase or the oscillation center of this mode of oscillation;
C) each node injects the amplitude size of the projection of the corresponding oscillationg component of active power on the corresponding oscillationg component of injection active power of datum node; Reflected that genset under this node is to the percentage contribution of this mode oscillation; According to the percentage contribution size of each node unit each node is sorted, estimate the relative size of each node corresponding mode of oscillation to the corresponding modes vibration.
Step 9: with the above-mentioned comprehensive modal analysis result of the whole network that calculates in main website; Comprise vibration node coherence grouping result, the percentage contribution ranking results of each node, and the lasting text description information of vibration is handed down to each associating low-frequency oscillation monitoring sub-station at once to vibrating;
Step 10: need the measurement amount of sending main website on the oscillation information for associating low-frequency oscillation monitoring sub-station in the step 7; When lasting several setting cycles of the oscillation amplitude of this measurement amount write down threshold value less than set vibration; Threshold information, the oscillation information of sending main website to measure on stopping are then write down less than vibration to the oscillation amplitude that main website sends this measurement in this substation;
Step 11:, send the overall situation alarm ending message of this vibration to each substation when associating low-frequency oscillation monitoring main website monitors each measurement amount oscillation amplitude of the whole network when all continuing some setting cycles and finishing threshold value less than set oscillating alarm or returned its oscillation amplitude less than vibration record threshold information;
Step 12: after information about certain overall situation vibration end of main website transmission is received in each substation; Stop to send the spectrum analysis result of vibration to main website; But if the oscillation amplitude of local measurement amount is during still greater than set vibration record threshold value; Then still analyze and write down the information such as frequency, amplitude, phase place, damping of whole second low-frequency oscillation constantly, during less than set vibration record threshold value, stop record the spectrum analysis result of vibration up to the oscillation amplitude of corresponding local measurement amount.
Above-mentioned associating low-frequency oscillation monitoring and analytical approach, make related each dispatching center of trans-regional vibration can canbe used on line to the real-time perception of trans-regional vibration mode, know role and degree of participation that the one's respective area is born in trans-regional vibration.For the dispatching center, upper strata of provincial dispatching center, promptly net is transferred, and unites vibration monitoring and analysis; Can be so that the electrical network scope that they observe; From 500kV trunk electrical network and the big genset of minority, extend to numerous genset that 220kV that provincial power network administers and following electrical network and provincial power network are managed, therefore help their macroscopic perspective from electrical network; Make the control that concrete unit increase and decrease is exerted oneself, realize effectively suppressing fast of low-frequency oscillation.Overcome each dispatching center and independently carried out low-frequency oscillation when monitoring; When running into trans-regional vibration; Each dispatching center is difficult to understand the global mode of vibration; Do not know the role of unit in vibration of own institute compass of competency, net transfers the vibration that is difficult to according to 500kV to measure the problem that plan is omited in the control of vibrating specific to the inhibition of low-voltage grade unit of making.
Description of drawings
Many dispatching centers of Fig. 1 WAMS associating low-frequency oscillation monitoring system block diagram.
Embodiment
1) the present invention is further detailed explanation below in conjunction with accompanying drawing and instance.In actual electric network according to the scope and the rank of the related dispatching center of associating low-frequency oscillation; Usually select the WAMS of the dispatching center of highest level to realize the main website that the associating low-frequency oscillation is monitored; For example national dispatching center (being called for short state transfers); When not relating to state's timing, then select a certain important big regional power grid dispatching center (be called for short net and transfer, for example the dispatching center, North China).The substation of associating low-frequency oscillation monitoring is generally province's compromise network and transfers.Below embodiment in be example with 3 associating low-frequency oscillation monitoring sub-stations and 1 each main website, implementation method of the present invention is described.Concrete steps are following: in the WAMS at the subdispatch center that all participation associating low-frequency oscillations are monitored, select 1 as associating low-frequency oscillation monitoring main website.The WAMS of all the other dispatching centers is as associating low-frequency oscillation monitoring sub-station.The original low-frequency oscillation monitoring function in each subdispatch center, still complete reservation is to realize quick low-frequency oscillation alarm function.
2) initialization and parameter configuration: main website participates in the substation to each to be needed to send the measurement amount of main website to select; Generally include nodal frequency, node injecting power and can equivalent be the line power of node injecting power; Vibration record threshold value, oscillating alarm threshold value and vibration to the different classes of measurement of each electric pressure (comprising active power or frequency) finish alarm threshold, and lasting accordingly periodicity is configured.The definition of these three kinds of threshold values is following:
I. threshold value is write down in vibration: when oscillation amplitude surpasses this threshold value, and substation record testing result, for example 10MW.
Ii. starting of oscillation alarm threshold: when oscillation amplitude surpassed this threshold value first, starting of oscillation information, for example 50MW were sent to main website in the substation;
Iii. vibration finishes alarm threshold: when oscillation amplitude progressively reduces from the starting of oscillation alarm threshold, and when being lower than this threshold value, vibration ending message, for example 30MW are sent to main website in the substation.
The starting of oscillation alarm threshold is maximum in these three kinds of threshold values, and vibration finishes alarm threshold takes second place, and it is minimum that threshold value is write down in vibration, and they can measure the electric pressure difference at place and stipulate different threshold values based on vibration.
3) WAMS at each subdispatch center independently carries out the low-frequency oscillation monitoring; Supervision from the real-time dynamic data of this dispatching center's basic platform promptly by dynamic datas such as the phasor of delivering to dispatching center's WAMS on the PMU, frequency, power; The time interval between its data section is generally 10ms ~ 100ms; The oscillating characteristic parameter of the monitored element measurement amount of real-time analysis appointment (be generally nodal frequency, transformer high-voltage side active power or can equivalent be the line power of node injecting power); The frequency, the amplitude that comprise vibration, phase place, parameter of oscillation information such as damping.
4) oscillation amplitude of oscillationg component that detects a certain frequency of certain measurement amount when each subdispatch center (comprising associating low-frequency oscillation monitoring main website and substation) WAMS surpasses " the vibration record threshold value " that this classification of relevant voltage grade measures; And the duration reaches and continues periodicity threshold value (being made as 5 cycles usually); Then low-frequency oscillation amplitude is first surpassed the initial moment of the moment of said vibration record threshold value as vibration; Each whole second subsequently, information such as the frequency of record low-frequency oscillation, amplitude, phase place, damping were to each subdispatch center real-time data base separately.
5) when each subdispatch center; The WAMS of i.e. associating low-frequency oscillation monitoring main website and substation detects the oscillation amplitude of oscillationg component of a certain frequency of certain measurement amount above " oscillating alarm threshold value "; And the duration reach and continue periodicity threshold value (being made as 5 cycles usually), then produce quick low-frequency oscillation alarm on the spot and with sending associating low-frequency oscillation monitoring main website on the warning information.Before the local alarm of this vibration disappeared, this measurement amount and other measurement amounts and this mode frequency differed the vibration less than 10%, no longer repeat alarm.On the local warning information content of the vibration sent comprise: the oscillation phase of local oscillation Alarm ID, measurement amount name, affiliated dispatching center, " the local alarm beginning of vibration " literal, oscillating alarm zero hour, the vibration start-of-record moment, oscillation frequency, active power or hunting of frequency amplitude, oscillation damping, oscillating alarm zero hour.
6) (notes: for avoiding takeing for is local oscillation, so do not use the local oscillation alarm, alarms or local alarm of vibrating and use is local after the vibration part alarm that receives substation or main website in associating low-frequency oscillation monitoring main website; To distinguish " overall oscillating alarm " and " alarm of the vibration overall situation " in addition; The former vibration is the vibration in the network-wide basis; The latter is meant the oscillation information of being accused out by low-frequency oscillation Conjoint Analysis main website; It possibly only be a local oscillation); Will with 0.5 second in zero-times of the local alarm of other vibrations that receives compare; Being as the criterion with the frequency of oscillating alarm zero-time measurement amount the earliest generates a new vibration overall situation alarm event, and the frequency of all the other local alarm events that vibrate is if differ in ± 10% with the frequency of this overall alarm event that vibrates, then think the incident that causes the local alarm of vibration actual with the incident that causes the alarm of the vibration overall situation be same vibration incident; To remaining and overall alarm event frequency difference greater than the local alarm event of ± 10% vibration; Think that these local alarm events are not caused by the overall alarm event of aforementioned vibration; Oscillation frequency with zero-time alarm the earliest in the local alarm of these residues is as the criterion; Generate a new vibration overall situation alarm event once more; And whether differ in ± 10% with the frequency of the new vibration overall situation alarm event that generates once more according to the frequency of measurement amount in other local alarm event that vibrates; Judge whether other local alarm event that vibrates causes that by the new vibration overall situation alarm event that generates once more the local alarm event that promptly vibrates is actually by same overall vibration incident with the overall alarm event of vibration and causes.The rest may be inferred; Find out all mode of oscillation of the whole network and corresponding overall alarm event thereof; And distribute overall alarm event ID; And send the overall alarm event start information of current vibration to each subdispatch center WAMS of participating in associating low-frequency oscillation monitoring, the information content comprises: the phase place of the frequency of overall Alarm ID, mode of oscillation of vibrating, the alarm zero hour, power or the hunting of frequency amplitude in network-wide basis, at first the measurement amount name of this mode of oscillation alarm, affiliated dispatching center, " vibration overall situation alarm beginning " literal, this vibration reported by local WAMS, oscillation damping, oscillation phase, alarm zero hour;
7) respectively participate in substation and the main website that the associating low-frequency oscillation is monitored; After receiving certain overall alarm event start information that vibrates; To sending the measurement amount of main website to carry out spectrum analysis on the needs selected in the step 2; And with among the spectrum analysis result, to should vibrate the overall situation alarm zero hour and subsequently whole second constantly with overall alarm vibration frequency frequency difference ± 10% with interior and frequency difference is minimum, and the spectrum analysis result that oscillation amplitude surpasses vibration record threshold value sends to main website.The content of sending comprises: the overall Alarm ID that vibrates, measurement amount name, affiliated dispatching center, the vibration overall situation alarm moment or subsequently whole second moment, oscillation frequency, power or hunting of frequency amplitude, oscillation damping, the oscillation phase in the corresponding moment.
8) after associating low-frequency oscillation monitoring main website receives the analysis of the oscillation result who returns about each overall each measurement amount of alarm vibration incident the whole network; Immediately corresponding vibration incident is carried out the comprehensive model analysis of the whole network; Comprise the vibration node coherence grouping, (be about to measure the close node of vibration trend that scale reveals and be classified as same a group, for example each is with the generator on the point of adjustment; Meritorious the increasing simultaneously or minimizing simultaneously that sends; And with its not people having the same aspiration and interest and the generator of participating in vibration, it sends meritoriously then shows opposite situation, promptly reduces simultaneously accordingly or increases simultaneously.), and confirm the relative size of each node to the contribution of vibration.The method of node coherence grouping and percentage contribution evaluation has some kinds, and according to the information feature of this patent, the method below adopting realizes that node coherence grouping and percentage contribution calculate:
I. be benchmark (its place node is a datum node) with the phase place of the maximum measurement amount of the corresponding mode of oscillation oscillation amplitude of nodal frequency or injection active power constantly at each; When the phase place of all the other nodal frequencies or the corresponding mode of oscillation of injection active power and reference phase differ within ± 90 °; Respective nodes belongs to same homology group, otherwise belongs to opposite homology group.
Ii. after homology group being carried out visual playing up, can find the vibration interphase or the oscillation center of this mode oscillation from the area between two homology groups.
Iii. each node injects the amplitude size of the projection of the corresponding oscillationg component of active power on the corresponding oscillationg component of injection active power of datum node, has reflected that genset under this node is to the percentage contribution of this mode oscillation.Based on the percentage contribution size of each node unit each node is sorted, can estimate the relative size of each node corresponding oscillation mode to the corresponding modes vibration.
9), comprise vibration node coherence grouping result, the percentage contribution ranking results of each node, and the lasting text description information of vibration is handed down to each associating low-frequency oscillation monitoring sub-station at once to vibrating with the above-mentioned comprehensive modal analysis result of the whole network that calculates in main website.The text description information content that vibration continues comprises: the peak power of the mode frequency of vibrate overall Alarm ID, vibration, full swing element or section measurement amount name, this measurement or hunting of frequency amplitude, oscillation damping, oscillation phase, the whole second corresponding moment of phase place, " oscillating alarm continues " literal.The duration can adopt the situation of hiving off and the oscillation intensity of method node that respectively vibrates of discontinuity surface during with each of playing up figure to carry out visual presentation in vibration, substation and main website can per 1 second (can be provided with) refresh The above results once on the visual figure of playing up.。
10) need the measurement amount of sending main website on the oscillation information for associating low-frequency oscillation monitoring sub-station in the step 7; When lasting several setting cycles (being made as 5 cycles usually) of the oscillation amplitude of this measurement amount write down threshold value less than set vibration; Threshold information is write down less than vibration to the oscillation amplitude that main website sends this measurement amount in this substation; The information content comprises: the overall Alarm ID that vibrates, measurement amount name, affiliated dispatching center, " measurement amount failure of oscillations record " literal, the time that stops to write down.Then, the oscillation information of sending main website to measure on the substation stops,
11) monitor each measurement amount oscillation amplitude of the whole network when all continuing some setting cycles (being made as 5 cycles usually) and finishing threshold value or returned " measurement amount failure of oscillations record " information when associating low-frequency oscillation monitoring main website less than set oscillating alarm; Send the overall situation alarm ending message of this vibration to each substation, the information content comprises: the overall Alarm ID that vibrates, " alarm of the vibration overall situation finishes " literal, concluding time
12) after information about certain overall situation vibration end of main website transmission is received in each substation, stop to send the spectrum analysis result of vibrating to main website.But if the oscillation amplitude of local measurement amount is still greater than set " vibration record threshold value "; Then still analyze and write down the information such as frequency, amplitude, phase place, damping of whole second low-frequency oscillation constantly; When the oscillation amplitude of corresponding local measurement amount writes down threshold value less than set vibration, stop record to the spectrum analysis result of vibration.
At last; What should explain is; Each dispatching center that participates in associating low-frequency oscillation monitoring can still keep original quick low-frequency oscillation supervision and message alert based on local information; Because it can experience the advantage that low-frequency oscillation has quick alarm to the one's respective area, although its can not know usually its vibration of experiencing specifically involved two ways with and concrete vibration mode what kind of is.When the operations staff inquires about carry out detailed mode based on the quick low-frequency oscillation message alert of local information, should be automatically associated to corresponding associating low-frequency oscillation warning information and visual content.Associating low-frequency oscillation monitoring and regional low-frequency oscillation monitoring can realize the complementation on performance and the function like this.
Claims (5)
1. dispatching center's WAMS more than a kind is united low-frequency oscillation monitoring method; This method is in the WAMS at a plurality of subdispatches center; Select one to be associating low-frequency oscillation monitoring main website; The WAMS of all the other dispatching centers is the substation, when any substation or main website monitor low-frequency oscillation when taking place, triggers the whole network associating low-frequency oscillation and analyzes; It is characterized in that, said method comprising the steps of:
Step 1: in the WAMS at the subdispatch center that all participation associating low-frequency oscillations are monitored, select 1 as associating low-frequency oscillation monitoring main website, the WAMS of all the other dispatching centers is as associating low-frequency oscillation monitoring sub-station;
Step 2: main website needs to send the measurement amount of main website to select to each substation of participating in associating low-frequency oscillation monitoring; Vibration record threshold value, oscillating alarm threshold value and oscillating alarm to the different classes of measurement of each electric pressure finish threshold value, and lasting accordingly periodicity threshold value is configured;
Step 3: the WAMS at each subdispatch center; The low-frequency oscillation monitoring is independently carried out in i.e. associating low-frequency oscillation monitoring main website and substation, keeps watch on the real-time dynamic data from dispatching center, one's respective area basic platform, real-time analysis measurement amount; The oscillating characteristic parameter of the monitored element electric parameters of i.e. appointment; Said oscillating characteristic parameter comprises frequency, the amplitude of vibration, phase place, damping etc.;
Step 4: WAMS when each subdispatch center; The oscillation amplitude of oscillationg component that i.e. associating low-frequency oscillation monitoring main website and substation detect a certain frequency of certain measurement amount surpasses the vibration that this classification of relevant voltage grade measures and writes down threshold value; And the duration reaches and continues the periodicity threshold value; Then low-frequency oscillation amplitude is first surpassed the initial moment of the moment of said vibration record threshold value as vibration; Each whole second subsequently, information such as the frequency of record low-frequency oscillation, amplitude, phase place, damping were to each subdispatch center real-time data base separately;
Step 5: WAMS when each subdispatch center; I.e. associating low-frequency oscillation monitoring main website and substation detect the oscillation amplitude of oscillationg component of a certain frequency of certain measurement amount above the oscillating alarm threshold value; And the duration reaches and continues the periodicity threshold value; Then produce the local alarm of quick low-frequency oscillation on the spot, and with giving associating low-frequency oscillation monitoring main website on the warning information, before the local alarm of this vibration disappears; This measurement amount and other measurement amounts and this mode frequencey differ the vibration less than 10%, no longer repeat alarm;
Step 6: associating low-frequency oscillation monitoring main website is after the local alarm of the vibration that receives substation or main website; Will with 0.5 second in zero-times of the local alarm of other vibrations that receives compare; Be as the criterion with the frequency of oscillating alarm zero-time measurement amount the earliest and generate a new vibration overall situation alarm event; The frequency of all the other local alarm events that vibrate is if differ in ± 10% with the frequency of this overall alarm event that vibrates, then think the incident that causes the local alarm of vibration actual with the incident that causes the alarm of the vibration overall situation be same vibration incident; To remaining and overall alarm event frequency difference greater than the local alarm event of ± 10% vibration; Think that these local alarm events that vibrate are not caused by the overall alarm event of aforementioned vibration; Oscillation frequency with zero-time alarm the earliest in the local alarm of these residue vibrations is as the criterion; Generate a new vibration overall situation alarm event once more; And whether differ in ± 10% with the frequency of the new vibration overall situation alarm event that generates once more according to the frequency of measurement amount in other local alarm event that vibrates; Judge that whether other local alarm event that vibrates is caused by the new vibration overall situation alarm event that generates once more, causes that promptly the incident of the local alarm of vibration and the incident that causes the alarm of the vibration overall situation are actually same vibration incident; The rest may be inferred, finds out all mode of oscillation of full electric network and corresponding overall alarm event thereof, and distribute overall alarm event ID, and send the overall alarm event start information of current vibration to the substation and the main website that participate in associating low-frequency oscillation monitoring;
Step 7: each participates in substation and the main website of associating low-frequency oscillation monitoring after receiving certain overall alarm event start information that vibrates; To sending the measurement amount of main website to carry out spectrum analysis on the needs selected in the step 2; And with among the spectrum analysis result to should vibrate the initial moment of overall situation alarm and subsequently whole second constantly with overall alarm vibration frequency frequency difference ± 10% with interior and frequency difference is minimum, and the oscillating characteristic parameter that oscillation amplitude surpasses the oscillationg component of vibration record threshold value sends to associating low-frequency oscillation monitoring main website;
Step 8: after associating low-frequency oscillation monitoring main website receives the spectrum analysis result who returns about each measurement amount of full electric network of each overall alarm event that vibrates; Corresponding vibration incident is carried out the comprehensive model analysis of full electric network; Comprise the vibration node coherence grouping, and confirm the relative size of each node the vibration contribution;
Step 9: the comprehensive modal analysis result of full electric network that calculates in associating low-frequency oscillation monitoring main website that obtains in the step 8 is handed down to each associating low-frequency oscillation monitoring sub-station at once; Wherein said comprehensive modal analysis result comprises vibration node coherence grouping result, the percentage contribution ranking results of each node to vibrating, and vibration continues text description information;
Step 10: need the measurement amount of sending main website on the oscillation information for associating low-frequency oscillation monitoring sub-station in the step 7; When lasting several predetermined cycles of the oscillation amplitude of this measurement amount are write down threshold value less than set vibration; Then this substation send oscillation amplitude from this measurement to main website less than vibration record threshold information, send the oscillation information that associating low-frequency oscillation monitoring main website should the measurement amount on stopping then;
Step 11: all continue predetermined some cycles when finishing threshold value less than set oscillating alarm or having returned its oscillation amplitude less than vibration record threshold information when associating low-frequency oscillation monitoring main website monitors each measurement amount oscillation amplitude of full electric network, sending to each substation should vibration overall situation alarm ending message;
Step 12: after the information about certain vibration overall situation alarm end of main website transmission is received in each substation; Stop to send the spectrum analysis result of vibration to main website; But if the oscillation amplitude of local measurement amount is during still greater than set vibration record threshold value; Then still analyze and write down the information such as frequency, amplitude, phase place, damping of whole second low-frequency oscillation constantly, during less than set vibration record threshold value, stop record the spectrum analysis result of vibration up to the oscillation amplitude of corresponding local measurement amount.
2. associating low-frequency oscillation monitoring method according to claim 1 is characterized in that:
In step 2, said oscillating alarm threshold value finishes threshold value greater than said oscillating alarm, and said oscillating alarm finishes threshold value greater than said vibration record threshold value, and stipulates different threshold values according to the electric pressure difference.
3. associating low-frequency oscillation monitoring method according to claim 1 is characterized in that:
In step 2, said amount is measured as monitored element electric parameters, and said monitored element electric parameters is nodal frequency, transformer high-voltage side active power or can equivalent be the line power of node injecting power.
4. associating low-frequency oscillation monitoring method according to claim 1 is characterized in that:
To vibration incident the whole network comprehensive model analysis, and confirm that each node is following to the method for the relative size of vibration contribution in the step 8:
A) be benchmark with the phase place of the maximum measurement amount of the corresponding mode of oscillation oscillation amplitude of nodal frequency or injection active power constantly at each; When the phase place of all the other nodal frequencies or the corresponding mode of oscillation of injection active power and reference phase differ within ± 90 °; Respective nodes belongs to same homology group, otherwise belongs to opposite homology group;
B) homology group is carried out visual playing up after, from the area between two homology groups, find the vibration interphase or the oscillation center of this mode of oscillation;
C) each node injects the amplitude size of the projection of the corresponding oscillationg component of active power on the corresponding oscillationg component of injection active power of datum node; Reflected that genset under this node is to the percentage contribution of this mode oscillation; According to the percentage contribution size of each node unit each node is sorted, estimate the relative size of each node corresponding mode of oscillation to the corresponding modes vibration.
5. associating low-frequency oscillation monitoring method according to claim 1 is characterized in that:
In step 2,4,5,10,11, continue the periodicity threshold value and be made as 5 cycles.
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