CN104779626A - Monitoring method for reactive power control of extra-high/ultrahigh-voltage direct-current convertor station - Google Patents
Monitoring method for reactive power control of extra-high/ultrahigh-voltage direct-current convertor station Download PDFInfo
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Abstract
The invention provides a monitoring method for reactive power control of an extra-high/ultrahigh-voltage direct-current convertor station. The monitoring method comprises the following steps: sampling by using a direct-current control system according to a sampling period; collecting and filtering the relevant analog quantity of reactive power control, and collecting switching values; if the first-time sampling is carried out, directly entering a normal running program; if not, entering a normal running or fault calculation program according to whether an initiation condition is met or not; checking the running state of a filter in the normal running program; when the checking result of the running state of the alternating current filter is abnormal, sending an abnormal running warning signal, not locking related control functions, and reminding workers to carry out corresponding treatment; in the fault calculation program, besides carrying out the working process of the normal running program, carrying out the logical analysis and judgment on the reason for abnormal input and removal of the alternating current filter, incident reporting, failure reporting and triggering fault recording. The method fills the blank of the industry, is very practical in practical engineering, and is easy to accept and convenient to be popularized.
Description
Technical field
The present invention relates to ultra high voltage or super high voltage direct current electricity transmission field, the supervision method of the control that is specifically related to that a kind of spy/superhigh voltage DC current conversion station is idle.
Background technology
Spy/HVDC (High Voltage Direct Current) converter substation is idle, and controlling functions is one of important controlling functions of DC control system, is the complex control function of a kind of multiple target, multi-boundary Condition.The object of idle controlling functions ensures that the reactive power exchange of ac and dc systems meets system requirements, alleviates the harm of current conversion station harmonic wave to ac and dc systems and main equipment simultaneously.Idle control is mainly through realizing the switching of the idle unit such as alternating current filter group (comprise large group of alternating current filter, large group of alternating current filter is made up of alternating current filter group).
Idle controlling functions is completed by DC control system.But DC control system only according to the control logic of setting, completes and controls the switching of alternating current filter, lack corresponding supervision for idle controlling functions, the risk hidden danger that it brings has:
1, DC control system lacks relevant alarm function to the data exception change existed in the middle of idle control or equipment deficiency, usually take to ignore after abnormal appearance, find the logics such as alternative method and carry out idle control, until the further generation caused the accident and expansion;
2, DC control system does not monitor the result of idle control, when (frequent switching exception appears in such as alternating current filter) after abnormal generation, cannot carry out supervision alarm and judgement to abnormal conditions, usually can the expansion of initiating failure.Powerless control system does not have dependent surveillance alarm function to relevant abnormalities information, and when scene finds the abnormal switching of alternating current filter, operations staff is difficult to judge fault according to field condition at once.
In addition, the idle functional configuration of each direct current system is slightly different, in the middle of operation for many years, expose various defect, owing to lacking the supervision to idle control, cause many after accident, taking anti-accident measures, and cannot before accident occurs to accident take indicate and alarm.Once repeatedly occurred in history monitoring owing to lacking idle control, cause idle control to be broken down, the accident of moving back thrown extremely by filter.
Summary of the invention
Object of the present invention does not have the deficiency of function for monitoring for existing spy/superhigh voltage DC current conversion station powerless control system, and provide the supervision method of a kind of spy/superhigh voltage DC current conversion station powerless control system, concrete technical scheme is as follows.
A supervision method for control that spy/superhigh voltage DC current conversion station is idle, it comprises the following steps:
(1) DC control system accepts Sampling interrupt by the fixing sampling period and enters sampling step;
(2) in sampling step, carry out collection and the filtering of idle control associated analog amount, the collection of switching value, sampled value is adjusted, if first time sampling, then directly enter normal working procedure, otherwise according to whether meeting starting conditions and enter normal working procedure or fault calculation process;
(3) in normal working procedure, according to the data of adjusting of step (2) to the inspection of alternating current filter running status, the inspection of alternating current filter running status comprises alternating current filter and drops into status checkout, voltage validity check and idle validity check, when alternating current filter running status check result is abnormal, send operation exception alarm signal, not locking relevant control function, reminds staff to carry out respective handling;
In fault calculation process, except carrying out the course of work of described normal working procedure, also carry out alternating current filter and drop into the abnormal logic analysis of excision and reason judgement, event report, Trouble Report and trigger fault record ripple.
Further, described in step (2), analog quantity comprises: busbar voltage, the group's alternating current filter reactive power of sending into large group of each alternating current filter of DC control system, the through current of each group alternating current filter, the idle calculated value that ac and dc systems exchanges; Described switching value comprise each group filter switch, disconnecting link, knife-like state, alternating current filter drop into combination.
Further, step (2) judges the starting conditions entering normal working procedure or fault calculation process, specifically comprises the following steps:
(3.1) drop into data splitting according to the sample alternating current filter that obtains of step (2), contrast with last sampling the data splitting that the alternating current filter of each sampling drops into, whether judgement alternating current filter throwing occurs is moved back; If do not occur to throw setback to enter step (3.2), if occur to throw setback to enter step (3.4);
(3.2) when step (3.1) judge the data splitting of alternating current filter with last sample do not change after, calculate the throwing of this alternating current filter and move back t interval time, t=t0+T, t0 is that interval time is moved back in the alternating current filter throwing that last time, sampling calculated, if t calculates first time, then t0 gets 0, T is a sampling period, and result of calculation t is sent into step (3.3);
(3.3) this alternating current filter of step 3.2 being calculated is thrown and is moved back interval time t and the AC filter continual on-off time definite value n*T of setting and compare, n>1:
As t<n*T, calculating alternating current filter is always thrown and is moved back group number Q
total n=Q
total n-1, Q
total n-1always throw for alternating current filter when last time, sampling calculated and move back group number, if Q
total nfor first time calculates, then Q
total n-1get 0;
As t>=n*T, calculating alternating current filter is always thrown and is moved back group number Q
total n=0, wherein n>1;
This step (3.3) enters normal working procedure after calculating;
(3.4) when step (3.1) judge alternating current filter combination with last sample compare and change after, sample according to this and last time sampled data calculate the group number n that this alternating current filter drops into
throw, the group number n that exits
move back, and always throw the group number n moved back
always=n
throw+ n
move back;
(3.5) according to the n that step 3.4 calculates
throw, n
move back, n
always, calculating alternating current filter is always thrown and is moved back group number Q
always=Q
total n-1+ n
alwaysif, Q
total nfor first time calculates, then Q
total n-1get 0;
(3.6) according to the Q that step 3.5 calculates
total njudge:
Work as Q
total n<Q
total, enter normal working procedure;
Work as Q
total n>=Q
total, enter failure operation program;
Wherein, Q
totalalternating current filter for setting is frequently thrown and is moved back number of times definite value.
Further, the input status checkout of step (3) described alternating current filter checks the state of the alternating current filter being judged to have dropped into through DC control system, below for the abundant unnecessary condition of input determined by filter:
Group's alternating current filter switch co-bit or I3> definite value, and disconnecting link determination co-bit, busbar voltage is normal;
Wherein: I3 represents the through current of group's alternating current filter, busbar voltage is the ac bus voltage of this large group of alternating current filter; When group's alternating current filter of DC control system judgement is in input state, but send operation exception alarm signal when not meeting above-mentioned condition, not locking relevant control function, remind operations staff to carry out respective handling.
Further, the validity check of step (3) described voltage checks the ac bus voltage of each large group of alternating current filter, and checking process comprises the following steps:
(5.1) the bus-bar potential transformer CVT gathering each large group of alternating current filter sends into the voltage of DC control system, absolute value validity check is carried out to the busbar voltage of each large group of alternating current filter: if voltage, within the limits of setting, is judged to be effective voltage, send into step (5.2) relative value validity check; If voltage is beyond the limits of setting, it is invalid to be judged to be, triggers operation exception alarm signal, and starts record ripple;
(5.2) busbar voltage of each large group of alternating current filter by absolute value validity check is carried out relative value validity check, the busbar voltage of the busbar voltage and other each large group of alternating current filter of often organizing large group of filter is compared, judge whether the absolute value of its difference exceedes set point, if difference within the limits of setting, is judged as effectively; If difference is beyond the scope of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple.
Further, the described idle validity check of step (3) checks the idle calculated value of each group alternating current filter group feeding DC control system, and checking process comprises the following steps:
(6.1) output calculating current conversion station each group filter is gathered idle, and carry out absolute value validity check to the output of each group alternating current filter is idle, if idle within the limits of setting, be judged as effectively, sending into step (6.2) idle rate of change validity check; If idle beyond the limits of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple;
(6.2) rate of change validity check is carried out by idle for the output of each group's filter by absolute value validity check, idle for the output of the group's filter sampled value with the last time is compared, judge whether its rate of change exceedes set point (20% conduct of normal employing rated value judges definite value), if rate of change within the limits of setting, is judged as effectively; If rate of change is beyond the scope of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple.
Further, to drop into the abnormal analysis of causes of excision be judge based on the logic of the alternating current filter automatic control function of DC control system to the filter that carries out in fault calculation process described in step (3), and its logic is specific as follows:
The automatic control function of alternating current filter is made up of multiple sub-switching function, and each subfunction realizes the control to switching according to the priority preset and criterion; The order that low priority subfunction sends just must be exported in the control overflow situation of subfunction meeting all high priorities; The subfunction priority that alternating current filter controls is as follows from high to low:
A. alternating voltage restriction controls;
B. harmonic controling;
C. idle Schema control/ac bus voltage mode controls alternative;
The supervision method of above-mentioned a kind of spy/superhigh voltage DC current conversion station is idle control, is characterized in that the criterion that idle controlling functions neutron function alternating voltage limit value controls is:
A., after alternating current filter busbar voltage is less than the definite value of setting, time delay one group of group's filter can automatically be dropped into; If busbar voltage is still less than definite value, then drop into other filter group successively according to certain time delay, until exchange large group filter busbar voltage to be greater than definite value;
B., after alternating current filter busbar voltage is greater than the definite value of setting, time delay one group of group's filter can automatically be exited; If busbar voltage is still greater than definite value, then exit other filter group successively according to certain time delay, until exchange large group filter busbar voltage to be less than definite value.
Further, it is corresponding with the size of direct current system transmission power that the criterion of idle controlling functions neutron function harmonic controling is embodied as the combination that alternating current filter drops at the scene, specifically controls according to the alternating current filter demand table of comparisons under the different direct current powers set in DC control system.
Further, the idle Schema control of idle controlling functions neutron function/ac bus voltage mode controls alternative, two kinds is all realized by controller, by setting 500kV ac bus voltage reference value or ac and dc systems exchange idle amount reference value as controlled quentity controlled variable, set two and control definite value, by dropping into group's alternating current filter, isolation group's alternating current filter two kinds of outlet modes, control 500kV ac bus voltage or ac and dc systems exchange idle amount within the controlling value place interval range of setting.
Further, the filter that carries out in fault calculation process described in step (3) drops into the abnormal analysis of causes of excision, it is the change by parameters before and after contrast filter switching, analyze the subfunction logic sending the order of filter switching, draw the data of the running parameter causing subfunction action to export further, and start corresponding outlet function, comprise event report, Trouble Report, failure wave-recording.
Can add the outlet of alternating current filter out-of-step blocking function according to actual conditions, namely enter fault calculation process and namely judge that alternating current filter vibrates, the reactive power automatic control function of locking DC control system, avoids system to vibrate, makes fault spread.
Compared with prior art, tool of the present invention has the following advantages and technique effect: the present invention will introduce the supervision method of the idle control of a kind of spy/HVDC (High Voltage Direct Current) converter substation, the idle controlling functions of DC control system is monitored, the abnormal conditions occurred in idle control are monitored and alarm, the idle fault controlling to occur is judged, accident cause after fault is judged, contributes to discovery abnormal before accident, and to the express analysis process of accident after accident.The idle controlling functions of the method to DC control system monitors, the abnormal conditions occurred in idle control are monitored and alarm, the idle fault controlling to occur is judged, accident cause after fault is judged, to contribute to before accident abnormal discovery and after accident to the rapid process of accident.
Accompanying drawing explanation
Fig. 1 is the general flow chart of the supervision method of the idle control of a kind of (spy) HVDC (High Voltage Direct Current) converter substation.
Fig. 2 is the starting sequence logic diagram of the supervision method of the idle control of a kind of (spy) HVDC (High Voltage Direct Current) converter substation.
Fig. 3 is the normal program logic figure of the supervision method of the idle control of a kind of (spy) HVDC (High Voltage Direct Current) converter substation.
Embodiment
Below in conjunction with accompanying drawing and concrete case, enforcement of the present invention is described further, but enforcement of the present invention is not limited thereto, if have process or the symbol of not special detailed description it is noted that following, be all that those skilled in the art can refer to existing techniques in realizing.By the supervision method integration of a kind of spy/superhigh voltage DC current conversion station is idle control that the present invention relates in the DC control system that expensive wide II returns DC transmission system ± 500kV Bao'an current conversion station, the idle control at this station is monitored.
As shown in Figure 1, the supervision method of the idle control of a kind of spy/HVDC (High Voltage Direct Current) converter substation, comprises the following steps:
(1) DC control system accepts Sampling interrupt by the fixing sampling period and enters sampling step;
(2) in sampling step, collection and the filtering of idle control associated analog amount is carried out, the collection of switching value.Wherein analog quantity comprises: busbar voltage, the group's alternating current filter reactive power of sending into large group of each alternating current filter of DC control system, the through current of each group alternating current filter, the idle calculated value that ac and dc systems exchanges; Described switching value comprise each group filter switch, disconnecting link, knife-like state, alternating current filter drop into combination.
(3) sampled value is adjusted, if first time sampling, then directly enter normal working procedure, otherwise enter normal working procedure or fault calculation process according to whether meeting starting conditions;
Judge the starting conditions entering normal working procedure or fault calculation process, as Fig. 2, its concrete logic comprises the following steps:
(3.1) drop into data splitting according to the sample alternating current filter that obtains of step (2), contrast with last sampling the data splitting that the alternating current filter of each sampling drops into, whether judgement alternating current filter throwing occurs is moved back; If do not occur to throw setback to enter step (3.2), if occur to throw setback to enter step (3.4);
(3.2) when step (3.1) judge alternating current filter combination with last sample do not change after, calculate the throwing of this alternating current filter and move back interval time, t=t0+T, t0 is that interval time is moved back in the alternating current filter throwing that last time, sampling calculated, if t calculates first time, then t0 gets 0, T is the sampling period, and result of calculation t is sent into step (3.3);
(3.3) this alternating current filter step (3.2) calculated is thrown the AC filter continual on-off time definite value n*T moving back time interval time t and setting and is compared, and n*T gets 20s:
As t<n*T, alternating current filter is always thrown and moved back the group total n=Q of number Q total n-1, Q total n-1 is that when last time, sampling calculated, alternating current filter was always thrown and moved back group number, if the total n of Q be first time calculating, then the total n-1 of Q gets 0;
As t>=n*T, alternating current filter is always thrown and is moved back the total n=0 of group number Q, wherein n>1;
Step 3.3 enters normal working procedure after calculating;
(3.4) when step (3.1) judge alternating current filter combination with last sample compare and change after, calculate this alternating current filter input group number n throwing, retreating according to this sampling with sampled data last time to go out to organize number n and move back, and always throws the group number n that moves back always=n throwing+n moves back;
(3.5) n calculated according to step (3.4) throws, n moves back, n is total, calculate alternating current filter always throw move back group number Q total=the total n-1+n of Q is total, if the total n of Q be first time calculating, then the total n-1 of Q gets 0;
(3.6) the total n of Q calculated according to step (3.5) judges:
When the total n<Q of Q always rises, enter normal working procedure;
When the total n>=Q of Q always rises, enter failure operation program;
Wherein, the Q alternating current filter always risen as setting frequently is thrown and is moved back number of times definite value, actual employing 6 times.
(4) in normal working procedure, according to the data of adjusting of step (2) to the inspection of alternating current filter running status, the inspection of alternating current filter running status comprises alternating current filter and drops into status checkout, voltage validity check and idle validity check.
The input status checkout of alternating current filter checks the state of the alternating current filter being judged to have dropped into through idle control, below for the abundant unnecessary condition of input determined by filter:
Group's alternating current filter switch co-bit or I3>0.5pu, and disconnecting link determination co-bit, busbar voltage is normal;
Wherein: I3 represents the through current of group's alternating current filter, current transformer T3 is had to gather; Busbar voltage is the ac bus voltage of this large group of alternating current filter; When the idle group's alternating current filter controlling to judge is in input state, but send operation exception alarm signal when not meeting above-mentioned condition, not locking relevant control function, remind operations staff to carry out respective handling.
At 500kV in the middle of the idle controlling functions of western current conversion station, as the I3>0.5pu of group's alternating current filter, this station is idle, and controlling functions is and judges that this group filter is in input state.By electric current criterion, group's filter judges whether it drops into, emerged in operation switch can be prevented, disconnecting link auxiliary node fault causes by mistake cutting of filter, but simultaneously for maintenance in the uncharged situation of filter brings risk, if be added beyond 0.5pu electric current to the filter of inspecting state, control system can be caused to judge filter by accident put into operation, affect the correctness of idle control.On March 5th, 2014,500kV was from western current conversion station carrying out, in the middle of maintenance process, being added beyond 0.5pu electric current to it to certain group alternating current filter, caused control system to judge this group filter by accident and put into operation, affect the correctness of idle control.
If this station adopts the supervision method of a kind of spy/superhigh voltage DC current conversion station the is idle control described in this patent, the method can check alternating current filter running status.The alternating current filter related in above-mentioned event does not meet input status condition according to the criterion of this method, different from the idle result controlling to judge of DC control system, will trigger operation exception alarm signal, reminds operations staff to carry out respective handling.
(5) voltage validity check checks the ac bus voltage of each large group of alternating current filter, and checking process comprises the following steps:
(5.1) the bus-bar potential transformer CVT gathering each large group of alternating current filter sends into the voltage of DC control system, absolute value validity check is carried out to the busbar voltage of each large group of alternating current filter: if voltage is within the limits 300kV-800kV of setting, then be judged to be effective voltage, send into step (5.2) relative value validity check; If voltage is beyond the limits of setting, it is invalid to be judged to be, triggers operation exception alarm signal, and starts record ripple;
(5.2) busbar voltage of each large group of alternating current filter by absolute value validity check is carried out relative value validity check, the busbar voltage of the busbar voltage and other each large group of alternating current filter of often organizing large group of filter is compared, judge whether the absolute value of its difference exceedes set point, if difference within the limits 15kV of setting, is then judged as effectively; If difference is beyond the scope of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple.
In the idle control logic of 500kV Bao'an current conversion station DC control system, when three organize greatly the busbar voltage of alternating current filter all within 300kV-800kV, get the reference value of maximum wherein as idle control, its hidden danger existed is: when three group filter all drops into greatly, raise when certain large group of filter busbar voltage is abnormal, three large group busbar voltage maximums are greater than the set point of surgical filtering device, voltage can be caused to limit controlling functions response, even can cause under serious conditions excising group's filter continuously, AC system voltage is reduced.History upper strata repeatedly occurs the situation that alternating current filter bus PT sampling is abnormal there is the possibility of this accident.After adopting the supervision method of a kind of spy/superhigh voltage DC current conversion station the is idle control described in this patent, when fluctuation appears in large group alternating current filter busbar voltage, all can check its absolute value and relative value, invalid when occurring that exception is then judged as, concurrent running abnormality alarming signal, start record ripple, remind operations staff to carry out respective handling.
(6) idle validity check checks the idle calculated value of each group alternating current filter group feeding DC control system, and checking process comprises the following steps:
(6.1) output calculating current conversion station each group filter is gathered idle, and carry out absolute value validity check to the output of each group alternating current filter is idle, if idle within the limits (50%-150% of rated value 175MW) of setting, be judged as effectively, sending into step (6.2) idle rate of change validity check; If idle beyond the limits of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple;
(6.2) rate of change validity check is carried out by idle for the output of each group's filter by absolute value validity check, idle for the output of the group's filter sampled value with the last time is compared, judge whether its rate of change exceedes set point (20% of rated value 175MW), if rate of change within the limits of setting, is judged as effectively; If rate of change is beyond the scope of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple.
500kV Bao'an current conversion station once occurred that losing due to a certain large group of alternating current filter phase voltage collection capacity all idle calculated values of group's alternating current filter dropping into causing this large group was 66% of actual value for several times, due in the idle control logic of our station DC control system, when the group's alternating current filter reactive power value calculating gained is all determined effectively between 50%-150%, causing all being used by mistake without work value of this large all group's alternating current filter dropping into of group, under extreme case, there is the risk of direct current limit power.After adopting the supervision method of a kind of spy/superhigh voltage DC current conversion station the is idle control described in this patent, when certain occurs above-mentioned fluctuation at the idle calculated value of the group's filter dropped into, it is invalid that idle control monitors this group of judgement idle calculated value of filter, concurrent running abnormality alarming signal, start record ripple, remind operations staff's process.
(7) in fault calculation process, except carrying out the course of work of described normal working procedure, also carry out alternating current filter and drop into the abnormal logic analysis of excision and reason judgement, event report, Trouble Report and trigger fault record ripple.
The analysis of causes that filter drops into excision abnormal judges based on idle control automatic function logic, and its logic is specific as follows:
The controlling functions of alternating current filter is made up of multiple sub-switching function, and each subfunction realizes the control to switching according to the priority preset and criterion; The order that low priority subfunction sends just must be exported in the control overflow situation of subfunction meeting all high priorities; The subfunction priority that alternating current filter controls is as follows from high to low:
A. alternating voltage restriction controls;
B. harmonic controling;
C. idle control model;
(8) criterion that alternating voltage limit value controls is:
A., after alternating current filter busbar voltage is less than the definite value 490kV of setting, one group of group's filter can automatically be dropped into by time delay 3s; If busbar voltage is still less than definite value, then drop into other filter group successively according to the time delay interval of time delay 150ms mono-group, until exchange large group filter busbar voltage to be greater than definite value;
B., after alternating current filter busbar voltage is greater than the definite value 580kV of setting, one group of group's filter can automatically be exited by time delay 3s; If busbar voltage is still greater than definite value, then exit other filter group successively according to the time delay interval of time delay 150ms mono-group, until exchange large group filter busbar voltage to be less than definite value.
(9) criterion of idle controlling functions neutron function harmonic controling be embodied as at the scene alternating current filter drop into combination corresponding with the size of direct current system transmission power, specifically according to the alternating current filter demand table of comparisons under the different direct current powers set in DC control system carry out control alternating current filter drop into combination corresponding with the size of direct current system transmission power, the idle throwing met in DC control system is moved back and is required that the table of comparisons is as follows.
(10) idle Schema control is realized by controller, by setting 500kV ac bus voltage reference value as controlled quentity controlled variable, set two and control definite value 0Mvar ,-200Mvar, by dropping into group alternating current filter, isolation group's alternating current filter two kinds of outlet modes (wherein often organize alternating current filter and provide idle 175Mvar), ac and dc systems being exchanged idle amount and controlling between the controlling value location of setting within (0Mvar ,-200Mvar) scope.
(11) carry out filter in fault calculation process and drop into the abnormal analysis of causes of excision, by the change of parameters before and after contrast filter switching, analyze the subfunction logic sending the order of filter switching, draw the data of the running parameter causing subfunction action to export further, and start corresponding outlet function, comprise event report, Trouble Report, failure wave-recording.
Also add the outlet of alternating current filter out-of-step blocking function simultaneously, namely enter fault calculation process and namely judge that alternating current filter vibrates, if idle control frequently sends input or the order of excision alternating current filter reaches 6 times, then automatic idle control model to be retreated to " manually " by " automatically ", alternating current filter switching is manually controlled by operations staff, avoids frequent switching to affect filter apparatus safety.Locking is idle automatic control function, avoids system to vibrate, makes fault spread.
500kV once occurred to distort the AC filter continual on-off phenomenon caused due to AC system from western current conversion station.On March 30th, 2014, when Niu Congjia DC bipolar 1550MW normally runs, there is AC filter continual on-off phenomenon from western current conversion station in afternoon from 14:32:15, and causes idle control to exit " automatically " pattern at 14:41:32, enters " manually " pattern.At 15:23:45 in order to recover back " automatically " pattern, manually idle control is operating as " automatically " pattern by " manually " pattern, again occurs AC filter continual on-off phenomenon afterwards, " manually " pattern is return again in idle control.
Owing to adding alternating current filter out-of-step blocking function in the idle control function for monitoring in this station, in idle control monitors AC filter continual on-off number of times Q total=6 times, judge AC filter continual on-off, start, alternating current filter out-of-step blocking function, automatically idle control model is cut to " manually " by " automatically ", prevents unnecessary switching from occurring, ensure the safety of filter apparatus.
Claims (10)
1. a supervision method for control that spy/superhigh voltage DC current conversion station is idle, is characterized in that comprising the following steps:
(1) DC control system accepts Sampling interrupt by the sampling period of setting and enters sampling step;
(2) in sampling step, carry out collection and the filtering of idle control associated analog amount, the collection of switching value, sampled value is adjusted, if first time sampling, then directly enter normal working procedure, otherwise according to whether meeting starting conditions and enter normal working procedure or fault calculation process; Described analog quantity comprises: busbar voltage, the group's alternating current filter reactive power of sending into large group of each alternating current filter of DC control system, the through current of each group alternating current filter, the idle calculated value that ac and dc systems exchanges; Described switching value comprise each group filter switch, disconnecting link, knife-like state, alternating current filter drop into combination;
(3) in normal working procedure, according to the data of adjusting of step (2) to the inspection of alternating current filter running status, the inspection of alternating current filter running status comprises alternating current filter and drops into status checkout, voltage validity check and idle validity check, when alternating current filter running status check result is abnormal, send operation exception alarm signal, not locking relevant control function, reminds staff to carry out respective handling;
In fault calculation process, except carrying out the course of work of described normal working procedure, also carry out alternating current filter and drop into the abnormal logic analysis of excision and reason judgement, event report, Trouble Report and trigger fault record ripple.
2. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 1, is characterized in that step (2) judges to enter the starting conditions of normal working procedure or fault calculation process, specifically comprises the following steps:
(3.1) drop into data splitting according to the sample alternating current filter that obtains of step (2), contrast with last sampling the data splitting that the alternating current filter of each sampling drops into, whether judgement alternating current filter throwing occurs is moved back; If do not occur to throw setback to enter step (3.2), if occur to throw setback to enter step (3.4);
(3.2) when step (3.1) judge the data splitting of alternating current filter with last sample do not change after, calculate the throwing of this alternating current filter and move back t interval time, t=t0+T, t0 is that interval time is moved back in the alternating current filter throwing that last time, sampling calculated, if t calculates first time, then t0 gets 0, T is a sampling period, and result of calculation t is sent into step (3.3);
(3.3) this alternating current filter of step 3.2 being calculated is thrown and is moved back interval time t and the AC filter continual on-off time definite value n*T of setting and compare, n>1:
As t<n*T, calculating alternating current filter is always thrown and is moved back group number Q
total n=Q
total n-
1, Q
total n-1always throw for alternating current filter when last time, sampling calculated and move back group number, if Q
total nfor first time calculates, then Q
total n-1get 0;
As t>=n*T, calculating alternating current filter is always thrown and is moved back group number Q
total n=0, wherein n>1;
This step (3.3) enters normal working procedure after calculating;
(3.4) when step (3.1) judge alternating current filter combination with last sample compare and change after, sample according to this and last time sampled data calculate the group number n that this alternating current filter drops into
throw, the group number n that exits
move back, and always throw the group number n moved back
always=n
throw+ n
move back;
(3.5) according to the n that step 3.4 calculates
throw, n
move back, n
always, calculating alternating current filter is always thrown and is moved back group number Q
always=Q
total n-1+ n
alwaysif, Q
total nfor first time calculates, then Q
total n-1get 0;
(3.6) according to the Q that step 3.5 calculates
total njudge:
Work as Q
total n<Q
total, enter normal working procedure;
Work as Q
total n>=Q
total, enter failure operation program;
Wherein, Q
totalalternating current filter for setting is frequently thrown and is moved back number of times definite value.
3. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 1, it is characterized in that the input status checkout of step (3) described alternating current filter checks the state of the alternating current filter being judged to have dropped into through DC control system, below for the abundant unnecessary condition of input determined by filter:
Group's alternating current filter switch co-bit or I3> definite value, and disconnecting link determination co-bit, busbar voltage is normal;
Wherein: I3 represents the through current of group's alternating current filter, busbar voltage is the ac bus voltage of this large group of alternating current filter; When group's alternating current filter of DC control system judgement is in input state, but send operation exception alarm signal when not meeting above-mentioned condition, not locking relevant control function, remind operations staff to carry out respective handling.
4. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 1, it is characterized in that the validity check of step (3) described voltage checks the ac bus voltage of each large group of alternating current filter, checking process comprises the following steps:
(5.1) the bus-bar potential transformer CVT gathering each large group of alternating current filter sends into the voltage of DC control system, absolute value validity check is carried out to the busbar voltage of each large group of alternating current filter: if voltage, within the limits of setting, is judged to be effective voltage, send into step (5.2) relative value validity check; If voltage is beyond the limits of setting, it is invalid to be judged to be, triggers operation exception alarm signal, and starts record ripple;
(5.2) busbar voltage of each large group of alternating current filter by absolute value validity check is carried out relative value validity check, the busbar voltage of the busbar voltage and other each large group of alternating current filter of often organizing large group of filter is compared, judge whether the absolute value of its difference exceedes set point, if difference within the limits of setting, is judged as effectively; If difference is beyond the scope of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple.
5. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 1, it is characterized in that the described idle validity check of step (3) checks the idle calculated value of each group alternating current filter group feeding DC control system, checking process comprises the following steps:
(6.1) output calculating current conversion station each group filter is gathered idle, and carry out absolute value validity check to the output of each group alternating current filter is idle, if idle within the limits of setting, be judged as effectively, sending into step (6.2) idle rate of change validity check; If idle beyond the limits of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple;
(6.2) rate of change validity check is carried out by idle for the output of each group's filter by absolute value validity check, idle for the output of the group's filter sampled value with the last time is compared, judge whether its rate of change exceedes set point, if rate of change within the limits of setting, is judged as effectively; If rate of change is beyond the scope of setting, it is invalid to be judged as, concurrent running abnormality alarming signal, starts record ripple.
6. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 1, to drop into the abnormal analysis of causes of excision be judge based on the logic of the alternating current filter automatic control function of DC control system to the filter that carries out in fault calculation process that it is characterized in that described in step (3), and its logic is specific as follows:
The automatic control function of alternating current filter is made up of multiple sub-switching function, and each subfunction realizes the control to switching according to the priority preset and criterion; The order that low priority subfunction sends just must be exported in the control overflow situation of subfunction meeting all high priorities; The subfunction priority that alternating current filter controls is as follows from high to low:
A. alternating voltage limit value controls;
B. harmonic controling;
C. idle Schema control/ac bus voltage mode controls alternative.
7. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 6, is characterized in that the criterion that idle controlling functions neutron function alternating voltage limit value controls is:
A., after alternating current filter busbar voltage is less than the definite value of setting, time delay one group of group's filter can automatically be dropped into; If busbar voltage is still less than definite value, then drop into other filter group successively according to certain time delay, until exchange large group filter busbar voltage to be greater than definite value;
B., after alternating current filter busbar voltage is greater than the definite value of setting, time delay one group of group's filter can automatically be exited; If busbar voltage is still greater than definite value, then exit other filter group successively according to certain time delay, until exchange large group filter busbar voltage to be less than definite value.
8. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 6, it is characterized in that the criterion of idle controlling functions neutron function harmonic controling be embodied as at the scene alternating current filter drop into combination corresponding with the size of direct current system transmission power, specifically control according to the alternating current filter demand table of comparisons under the different direct current powers set in DC control system.
9. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 6, it is characterized in that described idle Schema control/ac bus voltage mode controls alternative specifically: exchange idle amount reference value as controlled quentity controlled variable by the 500kV ac bus voltage reference value of setting or ac and dc systems, set two and control definite value, by dropping into group's alternating current filter, isolation group's alternating current filter two kinds of outlet modes, control 500kV ac bus voltage or ac and dc systems exchange idle amount within the controlling value place interval range of setting.
10. the supervision method of control that a kind of spy/superhigh voltage DC current conversion station is idle according to claim 1, it is characterized in that the filter that carries out in fault calculation process described in step (3) drops into the abnormal analysis of causes of excision, it is the change by parameters before and after contrast filter switching, analyze the subfunction logic sending the order of filter switching, draw the data of the running parameter causing subfunction action to export further, and start corresponding outlet function, comprise event report, Trouble Report, failure wave-recording.
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| CN107578118A (en) * | 2017-07-21 | 2018-01-12 | 中国电力科学研究院 | A kind of optimization method and its device of DC transmission system wave filter switching strategy |
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| CN109462240A (en) * | 2018-11-15 | 2019-03-12 | 许继电气股份有限公司 | A kind of reactive coordination control method and device of extra-high voltage direct-current layer-specific access |
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| CN109586317A (en) * | 2018-12-05 | 2019-04-05 | 国网辽宁省电力有限公司检修分公司 | A kind of new reactive power compensator control strategy |
| 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 |
| CN109738749A (en) * | 2019-01-04 | 2019-05-10 | 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 | A kind of DC transmission engineering DC filter primary circuit broken string is without stream detection method |
| CN110829420A (en) * | 2019-11-15 | 2020-02-21 | 中国南方电网有限责任公司超高压输电公司广州局 | Switching-on/off state judgment device for AC filter of convertor station group |
| 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 |
| CN113315099A (en) * | 2021-05-20 | 2021-08-27 | 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 |
| 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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