CN104779626B - A kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control - Google Patents
A kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control Download PDFInfo
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Abstract
The present invention provides a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control.It comprises the following steps：DC control system enters sampling by the sampling period；Idle control relevant mode analog quantity collection and filtering are carried out, the collection of switching value if sampling for the first time, is then directly entered normal operation program, otherwise according to whether meeting starting conditions and entering normal operation or fault calculation process；Device running status inspection is filtered in normal operation program, when alternating current filter running status inspection result is abnormal, operation exception alarm signal is sent, not locking relevant control function reminds staff to carry out respective handling；In fault calculation process, in addition to carrying out the course of work of the normal operation program, also carry out the abnormal logic analysis of alternating current filter input excision and reason judges, event report, Trouble Report and triggering failure wave-recording.The present invention has filled up industry blank, very practical among Practical Project, and is easy to receive, is easy to promote.
Description
Technical field
The present invention relates to extra-high voltage or super high voltage direct current electricity transmission field, and in particular to a kind of spy/superhigh voltage DC current conversion station
The monitoring method of idle control.
Background technology
Spy/HVDC converter substation is idle, and control function is one of important control function of DC control system, is a kind of
Multiple target, the complex control function of multi-boundary Condition.The purpose of idle control function is the reactive power exchange for ensureing ac and dc systemses
System requirements is met, while mitigating harm of the current conversion station harmonic wave to ac and dc systemses and main equipment.Idle control is main by right
The idle lists such as alternating current filter group (including big group of alternating current filter, big group of alternating current filter are made up of alternating current filter group)
The switching of member is realized.
Idle control function is completed by DC control system.However, DC control system is only according to the control logic of setting,
Complete to control the switching of alternating current filter, lack corresponding monitoring for idle control function, its risk hidden danger brought has：
1st, DC control system lacks related alarm to idle control data exception change or equipment deficiency present in
Function, is usually taken after occurring extremely and ignores, the idle control of the logics such as alternative progress found, until what is caused the accident enters
One step occurs and expanded；
2nd, result of the DC control system not to idle control is monitored, (such as ac filter after occurring extremely
It is abnormal that frequent switching occurs in device), it is impossible to monitoring alarm and judgement are carried out to abnormal conditions, can usually trigger the expansion of failure.Nothing
Work(control system does not have dependent surveillance alarm function to relevant abnormalities information, when scene finds the abnormal switching of alternating current filter, fortune
Administrative staff is difficult that failure is judged according to field condition at once.
In addition, the idle functional configuration of each straight-flow system is slightly different, various lack is exposed among operation for many years
Fall into, due to lacking the monitoring to idle control, cause to take anti-accident measures after accident more, and can not be right before accident occurs
Accident is taken indication and alerted.Once repeatedly occurred in history due to lacking monitoring to idle control, caused idle control
Break down, wave filter throws the accident moved back extremely.
The content of the invention
The purpose of the present invention does not have function for monitoring not for existing spy/superhigh voltage DC current conversion station powerless control system
Foot is there is provided a kind of monitoring method of spy/superhigh voltage DC current conversion station powerless control system, and concrete technical scheme is as follows.
A kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control, it comprises the following steps：
(1) DC control system receives Sampling interrupt by the fixed sampling period and enters sampling step；
(2) collection and filtering of idle control relevant mode analog quantity, the collection of switching value, to sampling are carried out in sampling step
Value is adjusted, if sampling for the first time, then normal operation program is directly entered, otherwise according to whether meeting starting conditions and entering
Enter normal operation program or fault calculation process；
(3) in normal operation program, data is adjusted to alternating current filter running status inspection according to step (2), handed over
Flowing the inspection of wave filter running status includes alternating current filter input status checkout, voltage validity check and the inspection of idle validity
Look into, when alternating current filter running status inspection result is abnormal, send operation exception alarm signal, not locking relevant control work(
Can, remind staff to carry out respective handling；
In fault calculation process, in addition to carrying out the course of work of the normal operation program, ac filter is also carried out
The abnormal logic analysis of device input excision and reason judgement, event report, Trouble Report and triggering failure wave-recording.
Further, analog quantity includes described in step (2)：Send into big group of each alternating current filter of DC control system
Busbar voltage, group's alternating current filter reactive power, the through current of each group's alternating current filter, the nothing that ac and dc systemses are exchanged
Work(calculated value；The switching value includes each group's filter switch, disconnecting link, earthing knife-switch state, the combination of alternating current filter input.
Further, step (2) judges to enter the starting conditions of normal operation program or fault calculation process, specifically includes
Following steps：
(3.1) obtained alternating current filter of being sampled according to step (2) puts into data splitting, to the ac filter sampled every time
The data splitting of device input is contrasted with last sampling, judges whether alternating current filter occurs throwing and move back；If throwing setback does not occur
Enter step (3.2), step (3.4) is entered in the event of setback is thrown；
(3.2) after step (3.1), which judges that the data splitting of alternating current filter and last time sampling are compared, not to change,
Calculate the throwing of this alternating current filter to move back interval time t, t=t0+T, t0 is that interval is moved back in the alternating current filter throwing that last time sampling is calculated
Time, if t is calculates for the first time, it is a sampling period that t0, which takes 0, T, and result of calculation t is sent into step (3.3)；
(3.3) step 3.2 is calculated to this obtained alternating current filter and throws the alternating current filter for moving back interval time t and setting
The frequent switching time, definite value n*T was compared, n>1：
Work as t<During n*T, calculating alternating current filter, always a group number Q is moved back in throwingTotal n=QTotal n-1, QTotal n-1Exchanged when sampling and calculate for last time
Wave filter is always thrown and moves back a group number, if QTotal nTo calculate for the first time, then QTotal n-1Take 0；
Work as t>During=n*T, calculating alternating current filter, always a group number Q is moved back in throwingTotal n=0, wherein n>1；
This step (3.3) calculating enters normal operation program after finishing；
(3.4) after step (3.1), which judges that alternating current filter combination is compared with last time sampling, to change, according to this
Sampling calculates the group number n of this alternating current filter input with last time sampled dataThrow, the group number n that exitsMove back, and always throw what is moved back
Group number nAlways=nThrow+nMove back；
(3.5) obtained n is calculated according to step 3.4Throw、nMove back、nAlways, calculating alternating current filter, always a group number Q is moved back in throwingAlways=QTotal n-1+
nAlwaysIf, QTotal nTo calculate for the first time, then QTotal n-1Take 0；
(3.6) obtained Q is calculated according to step 3.5Total nTo be judged：
Work as QTotal n<QIt is total to rise, into normal operation program；
Work as QTotal n>=QIt is total to rise, into failure operation program；
Wherein, QIt is total to riseNumber of times definite value is moved back for frequent throw of alternating current filter of setting.
Further, the input status checkout of step (3) described alternating current filter is to being determined as through DC control system
The state of the alternating current filter put into is checked, determines the abundant unnecessary condition of input for wave filter below：
Group's alternating current filter switch closes position or I3>Definite value, and disconnecting link determines conjunction position, busbar voltage is normal；
Wherein：I3 represents the through current of group's alternating current filter, and busbar voltage is the exchange of the big group of alternating current filter
Busbar voltage；The group's alternating current filter judged when DC control system but is unsatisfactory for sending during above-mentioned condition in input state
Operation exception alarm signal, not locking relevant control function reminds operations staff to carry out respective handling.
Further, step (3) the voltage validity check is the ac bus voltage to major groups of alternating current filters
Checked, checking process comprises the following steps：
(5.1) the bus-bar potential transformer CVT for gathering major groups of alternating current filters sends into the voltage of DC control system, right
The busbar voltage of major groups of alternating current filters carries out absolute value validity check：If voltage is within the limits of setting
It is determined as effective voltage, sends into step (5.2) relative value validity check；Sentence if voltage is beyond the limits of setting
It is invalid to be set to, and triggers operation exception alarm signal, and start record ripple；
(5.2) will be effective by the busbar voltage progress relative value of major groups of alternating current filters of absolute value validity check
Property check, the busbar voltage of every group of big group of wave filter and the busbar voltage of other major groups of alternating current filters are compared, sentenced
Whether the absolute value for its difference of breaking exceedes setting value, is judged as if difference is within the limits of setting effectively；If
It is invalid that difference is then judged as beyond the scope of setting, concurrent operation exception alarm signal, starts record ripple.
Further, step (3) the idle validity check is to send into DC control to each group's alternating current filter group
The idle calculated value of system is checked that checking process comprises the following steps：
(6.1) output of collection calculating each group's wave filter of current conversion station is idle, and to the defeated of each group's alternating current filter
Go out it is idle progress absolute value validity check, if it is idle within the limits of setting if be judged as effectively, send into step
(6.2) idle rate of change validity check；If it is idle beyond the limits of setting if be judged as invalid, concurrently run different
Normal alarm signal, starts record ripple；
(6.2) rate validity is changed by the output of each group's wave filter by absolute value validity check is idle
Check, by group's wave filter output it is idle be compared with last sampled value, judge its rate of change whether exceed set
Value (is used as frequently with the 20% of rated value and judges definite value), is judged as having if rate of change is within the limits of setting
Effect；It is invalid to be judged as if rate of change is beyond the scope of setting, concurrent operation exception alarm signal, starts record ripple.
Further, the reason for device input excision is abnormal point is filtered in fault calculation process described in step (3)
Analysis is the logic of the alternating current filter automatic control function based on DC control system to judge, its logic is specific as follows：
The automatic control function of alternating current filter is made up of many sub- switching functions, and each subfunction is according to set in advance
Priority and criterion realize the control to switching；The order that low priority subfunction is sent must meet all high preferential
Just exported in the case of the control requirement of the subfunction of level；The subfunction priority of alternating current filter control is as follows from high to low：
A. alternating voltage limitation control；
B. harmonic controling；
C. idle Schema control/ac bus voltage mode controls alternative；
A kind of monitoring method of above-mentioned spy/superhigh voltage DC current conversion station is idle control, it is characterised in that idle control function
The criterion that neutron function alternating voltage limit value is controlled is：
A. after alternating current filter busbar voltage is less than the definite value of setting, it can be delayed and automatically engage one group of group's wave filter；
If busbar voltage puts into other wave filter groups successively still less than definite value according to certain delay, until exchange is big
Group wave filter busbar voltage is more than definite value；
B. after alternating current filter busbar voltage is more than the definite value of setting, it can be delayed and automatically exit from one group of group's wave filter；
If busbar voltage exits other wave filter groups successively still above definite value according to certain delay, until exchange is big
Group wave filter busbar voltage is less than definite value.
Further, the criterion of idle control function neutron function harmonic controling is embodied as alternating current filter at the scene
The combination of input is corresponding with the size that straight-flow system conveys power, specifically straight according to the difference set in DC control system
The alternating current filter demand table of comparisons is controlled under stream power.
Further, the idle Schema control of idle control function neutron function/ac bus voltage mode control alternative,
Both of which is realized by controller, exchanges idle by the 500kV ac bus voltage reference value or ac and dc systemses of setting
Reference value is measured as controlled quentity controlled variable, two control definite values are set, by putting into group's alternating current filter, isolation group alternating current filter
Two kinds of outlet modes, control 500kV ac bus voltage or ac and dc systemses exchange idle amount in the controlling value location of setting
Between within scope.
Further, the reason for device input excision is abnormal point is filtered in fault calculation process described in step (3)
Analysis, is the change by contrasting parameters before and after wave filter switching, and analysis sends the subfunction logic of wave filter switching order,
The data for the running parameter for causing subfunction action outlet are from which further followed that, and start corresponding outlet function, including event report,
Trouble Report, failure wave-recording.
The outlet of alternating current filter out-of-step blocking function can be added according to actual conditions, that is, it is to sentence to enter fault calculation process
Determine alternating current filter to vibrate, the reactive power automatic control function of locking DC control system, it is to avoid system vibrates,
Make fault spread.
Compared with prior art, the invention has the advantages that and technique effect：The present invention is introduced into a kind of special/high straightening
The monitoring method of the idle control of current conversion station is flowed, the idle control function to DC control system is monitored, in idle control
The abnormal conditions of appearance are monitored and alerted, and the failure that idle control occurs are judged, to the cause of accident after failure
Judged, contributed to abnormal discovery before accident, and the rapid analyzing and processing after accident to accident.This method is to direct current
The idle control function of control system is monitored, the abnormal conditions occurred in idle control are monitored and alerted, to nothing
Power control is made existing failure and judged, the cause of accident after failure is judged, contributes to abnormal discovery before accident
With the rapid processing after accident to accident.
Brief description of the drawings
Fig. 1 is a kind of general flow chart of the monitoring method of the idle control of (spy) HVDC converter substation.
Fig. 2 is a kind of progress of starting sequence logic chart of the monitoring method of the idle control of (spy) HVDC converter substation.
Fig. 3 is a kind of normal program logic figure of the monitoring method of the idle control of (spy) HVDC converter substation.
Embodiment
Implementation below in conjunction with accompanying drawing and specific case to the present invention is described further, but the implementation of the present invention is not limited
In this, if being that those skilled in the art can refer to and show it is noted that the following process or symbol for having not especially detaileds description
Have what technology was realized.By a kind of monitoring method integration of spy of the present invention/superhigh voltage DC current conversion station is idle control in expensive
Wide II is returned in the DC control system of DC transmission system ± 500kV Bao'an current conversion station, and the idle control to the station is monitored.
As shown in figure 1, a kind of monitoring method of the idle control of spy/HVDC converter substation, comprises the following steps：
(1) DC control system receives Sampling interrupt by the fixed sampling period and enters sampling step；
(2) collection and filtering of idle control relevant mode analog quantity, the collection of switching value are carried out in sampling step.Wherein mould
Analog quantity includes：Busbar voltage, the group's alternating current filter reactive power of big group of each alternating current filter of DC control system are sent into,
The through current of each group's alternating current filter, the idle calculated value that ac and dc systemses are exchanged；The switching value is filtered including each group
Ripple device switch, disconnecting link, earthing knife-switch state, the combination of alternating current filter input.
(3) sampled value is adjusted, if sampling for the first time, is then directly entered normal operation program, otherwise basis is
It is no to meet starting conditions and enter normal operation program or fault calculation process；
Judge the starting conditions into normal operation program or fault calculation process, such as Fig. 2, its specific logic includes following
Step：
(3.1) obtained alternating current filter of being sampled according to step (2) puts into data splitting, to the ac filter sampled every time
The data splitting of device input is contrasted with last sampling, judges whether alternating current filter occurs throwing and move back；If throwing setback does not occur
Enter step (3.2), step (3.4) is entered in the event of setback is thrown；
(3.2) after step (3.1), which judges that alternating current filter combination is compared with last time sampling, not to change, this is calculated
Secondary alternating current filter is thrown and moved back interval time, t=t0+T, and t0 is that the alternating current filter throwing that last time sampling is calculated is moved back interval time, such as
Fruit t is calculates for the first time, then it is the sampling period that t0, which takes 0, T, and result of calculation t is sent into step (3.3)；
(3.3) step (3.2) is calculated into obtained this alternating current filter thrown and move back time interval time t and exchanging for setting
The filter continual on-off time, definite value n*T was compared, and n*T takes 20s：
Work as t<During n*T, alternating current filter is always thrown to move back when group total n-1 of the total n=Q of number Q total n-1, Q sampled and calculated for last time and exchanged
Wave filter is always thrown and moves back a group number, if the total n of Q is calculate for the first time, the total n-1 of Q take 0；
Work as t>During=n*T, alternating current filter is always thrown and moves back group number Q a total n=0, wherein n>1；
Step 3.3 calculating enters normal operation program after finishing；
(3.4) after step (3.1), which judges that alternating current filter combination is compared with last time sampling, to change, according to this
Sampling, which with last time sampled data calculates this alternating current filter input group number n throwing, retreating and goes out a group number n, moves back, and always throws the group moved back
Number n are total=and n throwings+n moves back；
(3.5) calculate that obtained n is thrown, n is moved back, n total according to step (3.4), calculate alternating current filter always throw move back group number Q it is total=
The total n-1+n of Q are total, if the total n of Q is calculate for the first time, the total n-1 of Q take 0；
(3.6) calculate obtained total n of Q to be judged according to step (3.5)：
As the total n of Q<Q always rises, into normal operation program；
As the total n of Q>=Q always rises, into failure operation program；
Wherein, Q always rises moves back number of times definite value for frequent throw of alternating current filter of setting, actual to use 6 times.
(4) in normal operation program, data is adjusted to alternating current filter running status inspection according to step (2), handed over
Flowing the inspection of wave filter running status includes alternating current filter input status checkout, voltage validity check and the inspection of idle validity
Look into.
The input status checkout of alternating current filter is the state of the alternating current filter to being judged to having put into through idle control
Checked, determined the abundant unnecessary condition of input for wave filter below：
Group's alternating current filter switch closes position or I3>0.5pu, and disconnecting link determines conjunction position, busbar voltage is normal；
Wherein：I3 represents the through current of group's alternating current filter, there is current transformer T3 collections；Busbar voltage is big for this
The ac bus voltage of group alternating current filter；The group's alternating current filter judged when idle control but is unsatisfactory in input state
Operation exception alarm signal is sent during above-mentioned condition, not locking relevant control function reminds operations staff to carry out respective handling.
In 500kV among the idle control function of western current conversion station, as the I3 of group's alternating current filter>0.5pu, the station without
Work(control function is and judges this group wave filter in input state.Group's wave filter judges whether it throws by electric current criterion
Enter, can prevent that emerged in operation switch, disconnecting link auxiliary node failure from causing cutting by mistake for wave filter, but simultaneously for wave filter without
Maintenance brings risk in the case of electricity, if being added beyond 0.5pu electric currents to the wave filter of inspecting state, control system can be caused to miss
Sentence wave filter to put into operation, influence the correctness of idle control.On March 5th, 2014,500kV was exchanged from western current conversion station to certain group
Wave filter is carried out among maintenance process, and 0.5pu electric currents are added beyond to it, causes control system to judge this group of wave filter by accident and has put into
Operation, influences the correctness of idle control.
If this station, should using a kind of monitoring method of spy described in this patent/superhigh voltage DC current conversion station is idle control
Method can be checked alternating current filter running status.The alternating current filter being related in above-mentioned event is sentenced according to this method
According to and be unsatisfactory for put into status condition, from DC control system it is idle control judge result it is different, will triggering operation exception announcement
Alert signal, reminds operations staff to carry out respective handling.
(5) voltage validity check is that the ac bus voltage of major groups of alternating current filters is checked, checking process
Comprise the following steps：
(5.1) the bus-bar potential transformer CVT for gathering major groups of alternating current filters sends into the voltage of DC control system, right
The busbar voltage of major groups of alternating current filters carries out absolute value validity check：If voltage is in the limits 300kV- of setting
Within 800kV, then it is determined as effective voltage, sends into step (5.2) relative value validity check；If voltage is in the definite value of setting
It is invalid to be then determined as beyond scope, triggers operation exception alarm signal, and start record ripple；
(5.2) will be effective by the busbar voltage progress relative value of major groups of alternating current filters of absolute value validity check
Property check, the busbar voltage of every group of big group of wave filter and the busbar voltage of other major groups of alternating current filters are compared, sentenced
Whether the absolute value for its difference of breaking exceedes setting value, if difference is within the limits 15kV of setting, is judged as effectively；
It is invalid to be judged as if difference is beyond the scope of setting, concurrent operation exception alarm signal, starts record ripple.
In the idle control logic of 500kV Bao'an current conversion station DC control system, when the bus of three big group alternating current filters
Voltage takes maximum therein as the reference value of idle control, its hidden danger existed is within 300kV-800kV：When
When three big group wave filter is put into, when certain big group of wave filter busbar voltage is raised extremely, three big group busbar voltage maximums are big
In the setting value of surgical filtering device, voltage can be caused to limit under control function response, serious conditions and result even in continuous excision
Group's wave filter, makes the reduction of AC system voltage.Repeatedly there is the abnormal situation of alternating current filter bus PT samplings in history upper strata,
There is this accident.Using a kind of monitoring side of spy described in this patent/superhigh voltage DC current conversion station is idle control
After method, when group alternating current filter busbar voltage greatly is fluctuated, its absolute value and relative value can be checked, it is different when occurring
It is invalid that Chang Ze is judged as, concurrent operation exception alarm signal, starts record ripple, reminds operations staff to carry out respective handling.
(6) idle validity check is that the idle calculated value that each group's alternating current filter group sends into DC control system is entered
Row checks that checking process comprises the following steps：
(6.1) output of collection calculating each group's wave filter of current conversion station is idle, and to the defeated of each group's alternating current filter
Go out idle progress absolute value validity check, if the idle limits (rated value 175MW 50%-150%) in setting
Within be then judged as effectively, send into step (6.2) idle rate of change validity check；If the idle limits in setting with
It is outer then be judged as invalid, concurrent operation exception alarm signal, start record ripple；
(6.2) rate validity is changed by the output of each group's wave filter by absolute value validity check is idle
Check, by group's wave filter output it is idle be compared with last sampled value, judge its rate of change whether exceed set
It is worth (the 20% of rated value 175MW), is judged as if rate of change is within the limits of setting effectively；If rate of change exists
It is invalid to be then judged as beyond the scope of setting, concurrent operation exception alarm signal, starts record ripple.
Losing due to a certain big group of alternating current filter phase voltage collection capacity once occurred for several times in 500kV Bao'an current conversion station to be made
All idle calculated values of group's alternating current filter in input of big group of cost are the 66% of actual value, due in our station direct current control
In the idle control logic of system processed, when group's alternating current filter reactive power value obtained by calculating between 50%-150%
It is determined effectively, causes this to organize being used without work value by mistake for all group's alternating current filters in input, extreme case greatly
It is lower to there is the risk that direct current limits power.Using a kind of monitoring of spy described in this patent/superhigh voltage DC current conversion station is idle control
After method, when certain in the idle calculated value of group's wave filter of input above-mentioned fluctuation occurs, idle control monitoring will determine that small
The idle calculated value of group wave filter is invalid, concurrent operation exception alarm signal, starts record ripple, reminds operations staff's processing.
(7) in fault calculation process, in addition to carrying out the course of work of the normal operation program, exchange filter is also carried out
The abnormal logic analysis of ripple device input excision and reason judgement, event report, Trouble Report and triggering failure wave-recording.
The reason for wave filter input excision is abnormal analysis controls automatic function logic to judge based on idle, its logic
It is specific as follows：
The control function of alternating current filter is made up of many sub- switching functions, and each subfunction is according to set in advance preferential
Level and criterion realize the control to switching；The order that low priority subfunction is sent must meet all high priorities
Just exported in the case of the control requirement of subfunction；The subfunction priority of alternating current filter control is as follows from high to low：
A. alternating voltage limitation control；
B. harmonic controling；
C. idle control model；
(8) criterion that alternating voltage limit value is controlled is：
A. after alternating current filter busbar voltage is less than the definite value 490kV of setting, the 3s that can be delayed automatically engages one group of group
Wave filter；If busbar voltage puts into other filters successively still less than definite value according to mono- group of 150ms of delay time delay interval
Bo Qi groups, until the big group wave filter busbar voltage of exchange is more than definite value；
B. after alternating current filter busbar voltage is more than the definite value 580kV of setting, the 3s that can be delayed automatically exits from one group of group
Wave filter；If busbar voltage exits other filters successively still above definite value according to mono- group of 150ms of delay time delay interval
Bo Qi groups, until the big group wave filter busbar voltage of exchange is less than definite value.
(9) criterion of idle control function neutron function harmonic controling is embodied as alternating current filter input at the scene
Combine corresponding with the size that straight-flow system conveys power, specifically according to the different dc powers set in DC control system
The lower alternating current filter demand table of comparisons is controlled combination and the size phase of straight-flow system conveying power of alternating current filter input
Correspondence, meets the idle throwing in DC control system and moves back and require that the table of comparisons is as follows.
(10) idle Schema control is realized by controller, is made by the 500kV ac bus voltage reference value of setting
For controlled quentity controlled variable, two control definite value 0Mvar, -200Mvar are set, are filtered by putting into group's alternating current filter, the exchange of isolation group
Ac and dc systemses are exchanged idle amount control by two kinds of outlet modes of ripple device (wherein every group alternating current filter provides idle 175Mvar)
Within interval (0Mvar, -200Mvar) scope where making the controlling value in setting.
(11) it is filtered the reason for device input excision is abnormal in fault calculation process to analyze, by contrasting wave filter switching
The change of front and rear parameters, analysis sends the subfunction logic of wave filter switching order, and from which further following that causes subfunction to be moved
The data of running parameter for export, and start corresponding outlet function, including event report, Trouble Report, failure wave-recording.
The outlet of alternating current filter out-of-step blocking function is additionally added simultaneously, i.e., be to judge ac filter into fault calculation process
Device vibrates, automatic by idle control if idle control frequently sends input or excision alternating current filter order reaches 6 times
Pattern is retreated to " manual " by " automatic ", and alternating current filter switching is controlled manually by operations staff, it is to avoid frequent switching influences
Filter apparatus safety.Locking is idle automatic control function, it is to avoid system vibrates, and makes fault spread.
500kV once occurred due to AC filter continual on-off phenomenon caused by AC system distortion from western current conversion station.
Afternoon on March 30th, 2014, when Niu Congjia DC bipolars 1550MW is normally run, from 14:32:15 start to occur from western current conversion station
AC filter continual on-off phenomenon, and cause idle control 14:41:32 exit " automatic " pattern, into " manual " pattern.
15:23:45 in order to be restored back to " automatic " pattern, by controlling to be operated as " automatic " mould by " manual " pattern by idle manually
, there is AC filter continual on-off phenomenon again afterwards in formula, and " manual " pattern is retracted in idle control again.
Due to adding alternating current filter out-of-step blocking function in the idle control function for monitoring in the station, when idle control monitoring
Middle AC filter continual on-off number of times Q is total=and 6 times, judge AC filter continual on-off, start, alternating current filter vibration is closed
Lock function, is cut to " manual " by idle control model by " automatic " automatically, prevents that unnecessary switching from occurring, it is ensured that wave filter is set
Standby safety.
Claims (10)
1. a kind of spy/the monitoring method of superhigh voltage DC current conversion station is idle control, it is characterised in that comprise the following steps：
(1) DC control system receives Sampling interrupt by the sampling period of setting and enters sampling step；
(2) collection and filtering of idle control relevant mode analog quantity are carried out in sampling step, the collection of switching value is entered to sampled value
Row is adjusted, if sampling for the first time, is then directly entered normal operation program, otherwise according to whether meeting starting conditions and entering just
Normal operation program or fault calculation process；The analog quantity includes：Send into big group of each alternating current filter of DC control system
Busbar voltage, group's alternating current filter reactive power, the through current of each group's alternating current filter, the nothing that ac and dc systemses are exchanged
Work(calculated value；The switching value includes each group's filter switch, disconnecting link, earthing knife-switch state, the combination of alternating current filter input；
(3) in normal operation program, data are adjusted to alternating current filter running status inspection, exchange filter according to step (2)
The inspection of ripple device running status includes alternating current filter input status checkout, voltage validity check and idle validity check,
Alternating current filter running status inspection result for it is abnormal when, send operation exception alarm signal, not locking relevant control function,
Staff is reminded to carry out respective handling；
In fault calculation process, in addition to carrying out the course of work of the normal operation program, alternating current filter throwing is also carried out
Enter the abnormal logic analysis of excision and reason judges, event report, Trouble Report and triggering failure wave-recording.
2. a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control according to claim 1, it is characterised in that step
Suddenly (2) judge to enter the starting conditions of normal operation program or fault calculation process, specifically include following steps：
(3.1) obtained alternating current filter of being sampled according to step (2) puts into data splitting, and the alternating current filter sampled every time is thrown
The data splitting entered is contrasted with last sampling, judges whether alternating current filter occurs throwing and move back；If throwing setback does not occur enters step
Suddenly (3.2), step (3.4) is entered in the event of throwing setback；
(3.2) after step (3.1), which judges that the data splitting of alternating current filter and last time sampling are compared, not to change, calculate
This alternating current filter is thrown and moved back interval time t, t=t0+T, and t0 is that interval time is moved back in the alternating current filter throwing that last time sampling is calculated,
If t is calculates for the first time, it is a sampling period that t0, which takes 0, T, and result of calculation t is sent into step (3.3)；
(3.3) step (3.2) is calculated to obtained this alternating current filter throwing and moves back interval time t and the alternating current filter set frequently
Numerous switching time definite value n*T is compared, n>1：
Work as t<During n*T, calculating alternating current filter, always a group number Q is moved back in throwingTotal n=QTotal n-1, QTotal n-1Alternating current filter when being calculated for last time sampling
Total throw moves back a group number, if QTotal nTo calculate for the first time, then QTotal n-1Take 0；
Work as t>During=n*T, calculating alternating current filter, always a group number Q is moved back in throwingTotal n=0, wherein n>1；
This step (3.3) calculating enters normal operation program after finishing；
(3.4) after step (3.1), which judges that alternating current filter combination is compared with last time sampling, to change, according to this sampling
The group number n of this alternating current filter input is calculated with last time sampled dataThrow, the group number n that exitsMove back, and always throw the group number moved back
nAlways=nThrow+nMove back；
(3.5) obtained n is calculated according to step (3.4)Throw、nMove back、nAlways, calculating alternating current filter, always a group number Q is moved back in throwingAlways=QTotal n-1+nAlways,
If QTotal nTo calculate for the first time, then QTotal n-1Take 0；
(3.6) obtained Q is calculated according to step (3.5)Total nTo be judged：
Work as QTotal n<QIt is total to rise, into normal operation program；
Work as QTotal n>=QIt is total to rise, into failure operation program；
Wherein, QIt is total to riseNumber of times definite value is moved back for frequent throw of alternating current filter of setting.
3. a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control according to claim 1, it is characterised in that step
Suddenly the input status checkout of (3) described alternating current filter is the alternating current filter to being judged to having put into through DC control system
State is checked, determines the abundant unnecessary condition of input for wave filter below：
Group's alternating current filter switch closes position or I3>Definite value, and disconnecting link determines conjunction position, busbar voltage is normal；
Wherein：I3 represents the through current of group's alternating current filter, and busbar voltage is the ac bus of the big group of alternating current filter
Voltage；The group's alternating current filter judged when DC control system but is unsatisfactory for sending operation during above-mentioned condition in input state
Abnormality alarming signal, not locking relevant control function reminds operations staff to carry out respective handling.
4. a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control according to claim 1, it is characterised in that step
Suddenly (3) described voltage validity check is that the ac bus voltage of major groups of alternating current filters is checked, checking process bag
Include following steps：
(5.1) the bus-bar potential transformer CVT for gathering major groups of alternating current filters sends into the voltage of DC control system, to major
The busbar voltage of group alternating current filter carries out absolute value validity check：Judge if voltage is within the limits of setting
For effective voltage, step (5.2) relative value validity check is sent into；It is determined as if voltage is beyond the limits of setting
It is invalid, operation exception alarm signal is triggered, and start record ripple；
(5.2) relative value validity inspection will be carried out by the busbar voltage of major groups of alternating current filters of absolute value validity check
Look into, the busbar voltage of every group of big group of wave filter and the busbar voltage of other major groups of alternating current filters are compared, it is judged
Whether the absolute value of difference exceedes setting value, is judged as if difference is within the limits of setting effectively；If difference
It is invalid to be then judged as beyond the scope of setting, concurrent operation exception alarm signal, starts record ripple.
5. a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control according to claim 1, it is characterised in that step
Suddenly (3) described idle validity check is that the idle calculated value that DC control system is sent into each group's alternating current filter group is carried out
Check, checking process comprises the following steps：
(6.1) output of collection calculating each group's wave filter of current conversion station is idle, and to the output nothing of each group's alternating current filter
Work(carry out absolute value validity check, if it is idle within the limits of setting if be judged as effectively, feeding step (6.2)
Idle rate of change validity check；If it is idle beyond the limits of setting if be judged as invalid, concurrent operation exception is accused
Alert signal, starts record ripple；
(6.2) the idle rate validity that is changed of the output of each group's wave filter by absolute value validity check is examined
Look into, be compared the output of group's wave filter is idle with last sampled value, whether judge its rate of change more than setting value,
It is judged as if rate of change is within the limits of setting effectively；It is judged as if rate of change is beyond the scope of setting
Invalid, concurrent operation exception alarm signal starts record ripple.
6. a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control according to claim 1, it is characterised in that step
Suddenly the reason for device input excision the is abnormal analysis that is filtered in fault calculation process described in (3) is to be based on DC control system
Alternating current filter automatic control function logic come what is judged, its logic is specific as follows：
The automatic control function of alternating current filter is made up of many sub- switching functions, and each subfunction is according to set in advance preferential
Level and criterion realize the control to switching；The order that low priority subfunction is sent must meet all high priorities
Just exported in the case of the control requirement of subfunction；The subfunction priority of alternating current filter control is as follows from high to low：
A. alternating voltage limit value is controlled；
B. harmonic controling；
C. idle Schema control/ac bus voltage mode controls alternative.
7. the monitoring method of a kind of spy/superhigh voltage DC current conversion station is idle control according to claim 6, it is characterised in that hand over
The criterion that controls of subfunction neutron function alternating voltage limit value of stream FILTER TO CONTROL is：
A. after alternating current filter busbar voltage is less than the definite value of setting, it can be delayed and automatically engage one group of group's wave filter；If
Busbar voltage then puts into other wave filter groups successively still less than definite value according to certain delay, until the big group filter of exchange
Ripple device busbar voltage is more than definite value；
B. after alternating current filter busbar voltage is more than the definite value of setting, it can be delayed and automatically exit from one group of group's wave filter；If
Busbar voltage then exits other wave filter groups successively still above definite value according to certain delay, until the big group filter of exchange
Ripple device busbar voltage is less than definite value.
8. the monitoring method of a kind of spy/superhigh voltage DC current conversion station is idle control according to claim 6, it is characterised in that hand over
The criterion for flowing the subfunction neutron function harmonic controling of FILTER TO CONTROL is embodied as the group of alternating current filter input at the scene
Close corresponding with the size that straight-flow system conveys power, specifically according under the different dc powers set in DC control system
The alternating current filter demand table of comparisons is controlled.
9. a kind of monitoring method of spy/superhigh voltage DC current conversion station is idle control according to claim 6, it is characterised in that institute
Stating idle Schema control/ac bus voltage mode control alternative is specifically：Joined by the 500kV ac bus voltage of setting
Examine value or ac and dc systemses exchange idle amount reference value as controlled quentity controlled variable, set two control definite values, exchanged by putting into group
Wave filter, isolation group two kinds of outlet modes of alternating current filter, control 500kV ac bus voltage or ac and dc systemses exchange nothing
Within interval range where controlling value of the work(amount in setting.
10. the monitoring method of a kind of spy/superhigh voltage DC current conversion station is idle control according to claim 1, it is characterised in that
The reason for device input excision is abnormal that be filtered in fault calculation process described in step (3) is analyzed, and is by contrasting filtering
The change of parameters before and after device switching, analysis sends the subfunction logic of wave filter switching order, and from which further following that causes son
The data of the running parameter of function action outlet, and start corresponding outlet function, including event report, Trouble Report, failure record
Ripple.
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| CN107578118B (en) * | 2017-07-21 | 2022-10-11 | 中国电力科学研究院 | Optimization method and device for switching strategy of filter of direct-current power transmission system |
| CN109462240B (en) * | 2018-11-15 | 2023-03-17 | 许继电气股份有限公司 | Reactive power coordination control method and device for extra-high voltage direct current layered access |
| CN109586317B (en) * | 2018-12-05 | 2022-04-08 | 国网辽宁省电力有限公司检修分公司 | Novel reactive power compensation device control strategy |
| CN109738749B (en) * | 2019-01-04 | 2020-11-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for detecting primary circuit disconnection and no current of direct current filter in direct current transmission project |
| CN110829420B (en) * | 2019-11-15 | 2024-06-04 | 中国南方电网有限责任公司超高压输电公司广州局 | Switching state judging device for alternating current filter of converter station group |
| CN113315099B (en) * | 2021-05-20 | 2022-10-21 | 国网宁夏电力有限公司检修公司 | Fault early warning method, medium and system for converter station alternating current filter circuit breaker |
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