CN104578411A - Multi-source data safety verification and failure locking method after PMU (Phasor Measurements Units) data's accessing to AGC (Automatic Generation Control) - Google Patents
Multi-source data safety verification and failure locking method after PMU (Phasor Measurements Units) data's accessing to AGC (Automatic Generation Control) Download PDFInfo
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Abstract
The invention discloses a multi-source data safety verification and failure locking method after PMU (Phasor Measurements Units) data's accessing to AGC (Automatic Generation Control). The method comprises the following steps: (1), enabling PMU measured data to be accessed to AGC; (2), invoking an AGC data processing module during each AGC execution cycle, and receiving and processing simulation and state telemeasuring data from SACDA and WAMS; (3), performing filtering processing on original measured data to filter out high-frequency component and reserving a variable part which conforms to control tracking and is matched with the response rate of a unit; (4), verifying measured data of multiple measuring points of the same data source in each AGC execution cycle, identifying ineffective measurement points and judging ineffective measurement; (5), if abnormality occurs, according to different types of abnormal conditions, carrying out corresponding locking control. According to the multi-source data safety verification and failure locking method after PMU (Phasor Measurements Units) data's accessing to AGC (Automatic Generation Control), provided by the invention, that PUM measuring information is combined with automatic generation control, so that a real-time dynamic monitoring and safety automatic control system for an electric system can be established, the safe and stable control over the electric system can be reinforced.
Description
Technical field
The present invention relates to the multi-source data safety check after a kind of PMU data access AGC and failure locking method, belong to automatic control technology of power system field.
Background technology
Net after " three China " ultra high voltage interconnected network, province adjust AGC (Automatic GenerationControl, automatic generation control) compare traditional AGC and have higher requirement, Real-time generation control not only will realize traditional meritorious " balance " and control, and will realize the cooperation control of " safety " control of gaining merit and net, province, ultra high voltage interconnection.AGC is generally from SCADA (Supervisory Control And Data Acquisition for tradition, data acquisition and watchdog subsystem) obtain frequency, unit and interconnection measurement information, SCADA is then from FES (Front EndSystem, front subsystem) obtain the initial value of these data, AGC controls the restriction being therefore subject to FES application, if FES application is broken down, it is even out of service that AGC application will enter time-out.In addition, SCADA system can only provide stable state, low sampling density, nonsynchronous power grid time section information.Along with the propelling that extra-high voltage project is built, for ensureing the safe and stable operation of the rear electrical network of ultra high voltage networking, AGC controls to have reliably correct Data Source in real time, and can provide complete data checking mechanisms and multi-data source processing method.
In recent years, endeavour PMU (the Phasor Measurements Units studied both at home and abroad, synchronous phasor measurement unit) and WAMS (Wide Area MeasurementSystem based on it, wide-area monitoring systems) make to carry out simultaneous observation to electric power system in meticulousr time scale, through development for many years, PMU is obtained in grid disturbance identification, low-frequency oscillation supervision applies widely with analysis, primary frequency modulation on-line examination.
In existing AGC control procedure, generally only utilize the metric data of SCADA, Data Source is comparatively single, is subject to the restriction of SCADA application running status, is unfavorable for the normal operation that AGC applies.
Summary of the invention
For the deficiency that prior art exists, the object of the invention is to provide the multi-source data safety check after a kind of PMU data access AGC and failure locking method, PMU measurement information is combined with automatic generation control, build Real-Time Dynamic Monitoring System of Power and automated security control system, to strengthen the security and stability control to electric power system.
To achieve these goals, the present invention realizes by the following technical solutions:
Multi-source data safety check after a kind of PMU data access AGC of the present invention and failure locking method, specifically comprise following step:
(1) by PMU metric data access AGC;
(2) within each AGC execution cycle, AGC data processing module is called, the simulation receiving and process from SACDA and WAMS and state telemetry;
(3) filtering process is carried out to original metric data (comprise mains frequency, interconnection conveying active power, unit is meritorious exerts oneself), filter high fdrequency component, retain the changing unit meeting and control tracking and match with the unit speed of response;
(4) within each AGC execution cycle, the metric data of multiple measuring points of same data source is verified, identify invalid measuring point, judge invalid measurement;
(5) if there is abnormal generation, then according to dissimilar abnormal conditions, corresponding lock-in control is taked.
In step (1), by PMU metric data access AGC, concrete grammar is as follows:
(1a) PMU metric data is delivered to WAMS application main website real-time database by PMU front subsystem;
(2a) the formula defining tool utilizing EMS platform to provide by WAMS apply under data switch to SCADA;
(3a) model expansion is carried out to AGC tester, newly-increased WAMS measuring point;
(4a) call real-time database data access interface, read the PMU metric data be forwarded under SCADA by keyword.
In step (2), to receive and process comprises region metric data, interconnection metric data and unit metric data from the simulation of SACDA and WAMS and state telemetry.
In step (3), AGC supports first-order low-pass ripple mode, second-order filter mode and approach of mean filter.
In step (4), the method verified the metric data of multiple measuring points of same data source is as follows:
(1b) for multiple measuring points that each measurement is measured, according to the ordering scenario of measuring point in AGC model, each measuring point is verified one by one, whether invalidly verify current measuring point;
If (2b) current measuring point is invalid, then proceed to next measuring point;
If all measuring points (3b) corresponding to this measurement amount are all invalid, then think that this measurement is invalid;
If (4b) this measurement has two and above effective measuring point, but between measuring point, deviation exceedes the threshold value of setting, then think that this measurement is invalid.
In step (1b), verify from the following aspects:
Measuring quality code check: measurement amount is with thinking during bad quality mark that this measurement is invalid;
Measure out-of-limit verification: when measurement amount exceeds the normal range (NR) of specifying, think that this measurement is invalid;
Measure and do not change verification: measurement amount any change does not occur within the time of specifying and thinks that this measurement is invalid;
Whether dispatcher specifies can not use: think that this measurement is invalid when dispatcher specifies and can not use.
In step (5), if there is abnormal generation, then according to dissimilar abnormal conditions, take the control of unit abnormal obliteration, power plant's meritorious measurement abnormal obliteration controls and region measures abnormal obliteration control.
Described unit abnormal obliteration control comprises unit output data sudden change lock-in control and unit measurement does not refresh lock-in control;
The method of described unit output data sudden change lock-in control is as follows:
Arrange unit sudden change threshold to every platform unit, when unit output sudden change exceedes threshold value, program is automatically exited AGC and is controlled; For unit control model, corresponding PLC exits control; For full factory control model, the sudden change as long as a unit is wherein exerted oneself, then this PLC exits control.
It is as follows that described unit measures the method not refreshing lock-in control:
When unit defines startup-shutdown measuring point; and when measuring point remote signalling state is for closing, AGC detects that unit remains unchanged within continuous several execution cycle, and the time power plant that exceedes in advance setting measure not after refresh time; think that this unit measures invalid, suspend PLC and control.
Described power plant gain merit measure abnormal obliteration control method as follows:
The equilibrium relation that AGC gains merit according to plant stand outgoing line side and generated output always adds, extremely whether judge that power plant is meritorious measures, and contrast with the remote signalling value of power plant active balance, when meritorious measurement amount and remote signalling are worth inconsistent, controlled for the AGC of full factory unit is proceeded to time-out immediately, prevents the mistake of unit instruction from issuing.
The method that described region measures abnormal obliteration control is as follows:
AGC overall region controls to carry out unifying to judge according to the state quantity measurement of each critical quantity measuring point, and monitor AGC state of a control, when area control error ACE is invalid, AGC suspends control.
PMU measurement information combines with automatic generation control by the present invention, builds Real-Time Dynamic Monitoring System of Power and automated security control system, to strengthen the security and stability control to electric power system.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of PMU metric data access AGC;
Fig. 2 is the workflow diagram verified multiple measuring points of same data source;
Fig. 3 is that region measures abnormal obliteration control logic workflow diagram.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
Multi-source data safety check after a kind of PMU data access AGC of the present invention and failure locking method, PMU measurement information is combined with automatic generation control, build Real-Time Dynamic Monitoring System of Power and automated security control system, to strengthen the security and stability control to electric power system.The broad outlines of invention is the keyword increasing WAMS application-dependent data point in existing AGC model, and the unified real-time database data access interface provided by keyword and EMS system reads PMU real-time measurement data.AGC data processing module is called, the simulation receiving and process from SACDA and WAMS and state telemetry within each AGC execution cycle.For the abnormal conditions of dissimilar metric data, take corresponding lock-in control.
Multi-source data safety check after a kind of PMU data access AGC of the present invention and failure locking method, comprise the steps:
(1) by PMU metric data access AGC, see Fig. 1, concrete grammar is as follows:
(1a) PMU metric data is delivered to WAMS application main website real-time database by PMU front subsystem;
(2a) the formula defining tool utilizing EMS platform to provide by WAMS apply under data switch to SCADA;
(3a) model expansion is carried out to AGC tester, newly-increased WAMS measuring point;
(4a) real-time database data access interface is called, read the PMU metric data be forwarded under SCADA by keyword, by step 1, WAMS data are introduced in AGC control, extend the basic data source of AGC, the normal operation of AGC application is more secure;
(2) within each AGC execution cycle, AGC data processing module is called, the simulation receiving and process from SACDA and WAMS and state telemetry.Comprise:
Region measures: the ACE value etc. that system frequency, the time difference, higher level's scheduling (as network regulation) issue.
Interconnection measures: Tie line Power etc.
Unit measures: power output, unit regulate upper lower limit value, unit operation/stoppages in transit, the control of a unit AGC distant place drops into/exits, whether unit operated in upper and lower bound, unit whether in sliding pressure operation etc.
(3) filtering mode set by system carries out filtering to ACE data, to filter high fdrequency component.
(4) verify multiple measuring points of same data source, see Fig. 2, concrete steps are as follows:
(1b) for multiple measuring points that each measurement is measured, according to the ordering scenario (measuring point 1, measuring point 2, measuring point 3) of measuring point in AGC model, each measuring point is verified one by one, mainly carries out from the following aspects:
Measuring quality code check: measurement amount is with thinking during bad quality mark that this measurement is invalid.
Measure out-of-limit verification: when measurement amount exceeds the normal range (NR) of specifying, think that this measurement is invalid.
Measure and do not change verification: measurement amount any change does not occur within the time of specifying and thinks that this measurement is invalid.
Whether dispatcher specifies can not use: think that this measurement is invalid when dispatcher specifies and can not use.
If (2b) this measuring point is invalid, then proceed to next measuring point.
If all measuring points (3b) corresponding to this measurement amount are all invalid, then think that this measurement is invalid.
If (4b) this measurement has multiple (two and more than) effectively measuring point, but between measuring point, deviation exceedes the threshold value of setting, then think that this measurement is invalid.
(5) if there is abnormal generation, then according to dissimilar abnormal conditions, take corresponding lock-in control, mainly comprise following several step:
(1c) unit abnormal obliteration controls
Unit output data sudden change lock-in control: arrange unit sudden change threshold to every platform unit, when unit output sudden change exceedes threshold value, program is automatically exited AGC and is controlled.For unit control model, corresponding PLC exits control; For full factory control model, the sudden change as long as a unit is wherein exerted oneself, then this PLC exits control.
Unit measures and does not refresh lock-in control: when unit defines " startup-shutdown measuring point "; and when measuring point remote signalling state is " conjunction "; AGC detects that unit remains unchanged within continuous several execution cycle; and after the time exceedes " power plant measures not refresh time " of in advance setting; think that this unit measures invalid, suspend PLC and control.
(2c) the meritorious abnormal obliteration that measures of power plant controls
The meritorious abnormal obliteration that measures of power plant controls: the equilibrium relation that AGC gains merit according to plant stand outgoing line side and generated output always adds, extremely whether judge that power plant is meritorious measures, and contrast with the remote signalling value of power plant active balance, when meritorious measurement amount and remote signalling are worth inconsistent, controlled for the AGC of full factory unit is proceeded to time-out immediately, prevents the mistake of unit instruction from issuing.
(3c) region measures abnormal obliteration control:
On the basis that above-mentioned measurement processes, AGC overall region controls to carry out unifying to judge according to the state quantity measurement of each critical quantity measuring point again, and monitor AGC state of a control, when area control error ACE is invalid, AGC suspends control.Concrete steps are: whether first determination frequency measures effective, then judge that whether contact interconnection is effective.If all normal, AGC normal operation.If it is invalid that frequency measures, for employing FFC (Flat Frequency Control, constant frequency controls) and TBC (Tie-line and Frequency Bias Control, order wire frequency Deviation Control) AGC of control model, judge whether exceed given invalid time delay (such as 4 seconds) ineffective time again, if exceeded, then think that the calculating ACE of AGC is invalid, judge whether available remote measurement ACE again, if there is no available remote measurement ACE, then judge that the ACE of AGC is invalid, AGC suspends.If it is invalid that interconnection measures, for employing FTC (Flat Tie-line Control, constant dominant eigenvalues controls) and TBC (Tie-line andFrequency Bias Control, order wire frequency Deviation Control) AGC of control model, judge whether exceed given invalid time delay (such as 4 seconds) ineffective time again, if exceeded, then think that the calculating ACE of AGC is invalid, judge whether available remote measurement ACE again, if there is no available remote measurement ACE, then judge that the ACE of AGC is invalid, AGC suspends.
By step (4), more perfect judgement can be carried out to the correctness of the metric data after the multiple measuring point of introducing, more effectively can ensure the correctness that AGC runs.Control logic flow chart as shown in Figure 3.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (10)
1. the multi-source data safety check after PMU data access AGC and a failure locking method, is characterized in that, specifically comprises following step:
(1) by PMU metric data access AGC;
(2) within each AGC execution cycle, AGC data processing module is called, the simulation receiving and process from SACDA and WAMS and state telemetry;
(3) filtering process is carried out to original metric data, filter high fdrequency component, retain the changing unit meeting and control to follow the tracks of and the unit speed of response matches;
(4) within each AGC execution cycle, the metric data of multiple measuring points of same data source is verified, identify invalid measuring point, judge invalid measurement;
(5) if there is abnormal generation, then according to dissimilar abnormal conditions, corresponding lock-in control is taked.
2. the multi-source data safety check after PMU data access AGC according to claim 1 and failure locking method, is characterized in that,
In step (1), by PMU metric data access AGC, concrete grammar is as follows:
(1a) PMU metric data is delivered to WAMS application main website real-time database by PMU front subsystem;
(2a) the formula defining tool utilizing EMS platform to provide by WAMS apply under data switch to SCADA;
(3a) model expansion is carried out to AGC tester, newly-increased WAMS measuring point;
(4a) call real-time database data access interface, read the PMU metric data be forwarded under SCADA by keyword.
3. the multi-source data safety check after PMU data access AGC according to claim 1 and failure locking method, is characterized in that,
In step (2), to receive and process comprises region metric data, interconnection metric data and unit metric data from the simulation of SACDA and WAMS and state telemetry.
4. the multi-source data safety check after PMU data access AGC according to claim 1 and failure locking method, is characterized in that,
In step (3), AGC supports first-order low-pass ripple mode, second-order filter mode and approach of mean filter.
5. the multi-source data safety check after PMU data access AGC according to claim 1 and failure locking method, is characterized in that,
In step (4), the method verified the metric data of multiple measuring points of same data source is as follows:
(1b) for multiple measuring points that each measurement is measured, according to the ordering scenario of measuring point in AGC model, each measuring point is verified one by one, whether invalidly verify current measuring point;
If (2b) current measuring point is invalid, then proceed to next measuring point;
If all measuring points (3b) corresponding to this measurement amount are all invalid, then think that this measurement is invalid;
If (4b) this measurement has two and above effective measuring point, but between measuring point, deviation exceedes the threshold value of setting, then think that this measurement is invalid.
6. the multi-source data safety check after PMU data access AGC according to claim 5 and failure locking method, is characterized in that,
In step (1b), verify from the following aspects:
Measuring quality code check: measurement amount is with thinking during bad quality mark that this measurement is invalid;
Measure out-of-limit verification: when measurement amount exceeds the normal range (NR) of specifying, think that this measurement is invalid;
Measure and do not change verification: measurement amount any change does not occur within the time of specifying and thinks that this measurement is invalid;
Whether dispatcher specifies can not use: think that this measurement is invalid when dispatcher specifies and can not use.
7. the multi-source data safety check after PMU data access AGC according to claim 1 and failure locking method, is characterized in that,
In step (5), if there is abnormal generation, then according to dissimilar abnormal conditions, take the control of unit abnormal obliteration, power plant's meritorious measurement abnormal obliteration controls and region measures abnormal obliteration control.
8. the multi-source data safety check after PMU data access AGC according to claim 7 and failure locking method, is characterized in that,
Described unit abnormal obliteration control comprises unit output data sudden change lock-in control and unit measurement does not refresh lock-in control;
The method of described unit output data sudden change lock-in control is as follows:
Arrange unit sudden change threshold to every platform unit, when unit output sudden change exceedes threshold value, program is automatically exited AGC and is controlled; For unit control model, corresponding PLC exits control; For full factory control model, the sudden change as long as a unit is wherein exerted oneself, then this PLC exits control.
It is as follows that described unit measures the method not refreshing lock-in control:
When unit defines startup-shutdown measuring point; and when measuring point remote signalling state is for closing, AGC detects that unit remains unchanged within continuous several execution cycle, and the time power plant that exceedes in advance setting measure not after refresh time; think that this unit measures invalid, suspend PLC and control.
9. the multi-source data safety check after PMU data access AGC according to claim 7 and failure locking method, is characterized in that,
Described power plant gain merit measure abnormal obliteration control method as follows:
The equilibrium relation that AGC gains merit according to plant stand outgoing line side and generated output always adds, extremely whether judge that power plant is meritorious measures, and contrast with the remote signalling value of power plant active balance, when meritorious measurement amount and remote signalling are worth inconsistent, controlled for the AGC of full factory unit is proceeded to time-out immediately, prevents the mistake of unit instruction from issuing.
10. the multi-source data safety check after PMU data access AGC according to claim 7 and failure locking method, is characterized in that,
The method that described region measures abnormal obliteration control is as follows:
AGC overall region controls to carry out unifying to judge according to the state quantity measurement of each critical quantity measuring point, and monitor AGC state of a control, when area control error ACE is invalid, AGC suspends control.
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| C06 | Publication | ||
| PB01 | Publication | ||
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