CN107516899B - Processing method of multi-frequency measuring point in automatic power generation control system - Google Patents
Processing method of multi-frequency measuring point in automatic power generation control system Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 12
- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 82
- 238000012795 verification Methods 0.000 claims abstract description 39
- 230000035772 mutation Effects 0.000 claims abstract description 19
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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Abstract
A processing method of multi-frequency measuring points in an automatic power generation control system comprises the following steps: establishing a control area frequency measuring point model; when the attribute of whether any frequency measuring point in the control area is a main measuring point or not or the attribute of priority is changed, arranging the frequency measuring points in the control area according to the priority to form a frequency measuring point chain table of each control area; in each AGC execution period, each control area is processed according to the following steps of initializing a frequency measuring point, acquiring a frequency measuring value and carrying out measurement quality verification, verifying the frequency data range of the measuring point, verifying the updating time of the frequency measuring point, verifying the deviation of the multi-frequency measuring point and verifying the frequency mutation of the control area.
Description
Technical Field
The invention relates to an electric energy management system, in particular to a processing method of a multi-frequency measuring point in an automatic power generation control system.
Background
An automatic generation control system (AGC) is an important component in an electric energy management system, and is responsible for important missions such as active power balance, frequency control, tie line exchange power control, and the like of a regional power grid. The automatic power generation control system calculates the regional control deviation of the power grid according to the frequency and the exchange power of the regional power grid, then calculates the total power amount required to be regulated in the region according to the deviation, distributes the side power regulating amount to the generator sets related to the region according to a certain strategy, and adjusts the active balance of the system in real time by controlling the active output of the generator sets so as to achieve the control target of maintaining the system frequency close to the rated frequency and the exchange power close to the planned exchange power.
Frequency is an important data for the operation of an automatic power generation control system. Frequency is an important component of the regional control bias, which reflects the active power balance of the power system. Ensuring that the system frequency operates in a range around the nominal frequency is an important control objective for AGC. Therefore, it is necessary to ensure that the AGC can accurately acquire the system frequency.
AGC typically acquires the system frequency through frequency measurements in a SCADA system. The clock devices at different positions of the power system send the measured frequency values to a front-end system of an electric Energy Management System (EMS) in a message mode, and then measurement is formed in the SCADA subsystem. SCADA systems may typically provide multiple frequency measurements, which may come from different power plants, substations or load sides in the power system. In order to accurately acquire the system frequency, the AGC should determine the system frequency at that moment through various checks by analyzing a plurality of different frequency measurement points in each execution cycle.
The system frequency is accurately obtained from a plurality of frequency measuring points, and the frequency measurement needs to be verified in multiple aspects:
(1) and (3) measurement quality verification: the SCADA system will form measured quality bits according to the measured data source condition, measurement change condition, etc., for example, the measured quality bits are not updated, the measurement is invalid, etc., and the AGC needs to determine the quality bits.
(2) And (3) data range checking: only frequencies within a specified range, which is a settable value, typically 49.5-50.5, are correctly available.
(3) And (4) checking the updating time: the normal frequency should be updated once in a few seconds or even changed every second, and the frequency measurement without change in the long term is abnormal. The frequency allowed constant time should be a fixed value that can be set.
(4) Mutual verification among a plurality of frequency measuring points: the frequency after the quality verification, the data range verification and the time updating verification also need to be verified mutually, namely, the deviation among the frequency measuring points is considered, and if the deviation between a certain frequency measuring point and a plurality of frequency measuring points is larger, the value of the measuring point is not used; the acceptable frequency bins should deviate less than a specified value from more than half of the frequency bins.
(5) And (3) checking frequency mutation: if the system frequency of the area changes suddenly, the frequency may be incorrect, or the area is disturbed greatly, and the AGC should pause the control when the situation is met.
In addition, different measuring points have different measurement stability due to different measurement environments of the data source, and a frequency measuring point with good measurement stability should be preferentially adopted. In special cases, it is also contemplated that frequency stations may be manually designated.
Disclosure of Invention
The invention aims to provide a multi-frequency measuring point processing method, which enables AGC to accurately acquire system frequency; the method can strictly judge a plurality of frequency measuring points and flexibly support priority setting and manual intervention.
The technical scheme of the invention is as follows:
a processing method of multi-frequency measuring points in an automatic power generation control system comprises the following steps:
step 2, when the key attribute of any frequency measuring point in the control area changes, arranging the frequency measuring points in the control area according to the priority to form a frequency measuring point chain table of each control area;
and 3, in each AGC execution period, carrying out initialization frequency measurement points, frequency measurement value acquisition and frequency verification processing on the multi-frequency measurement points in each control area.
Further, the key attribute in step 2 is "whether it is a main point" or "priority" attribute.
Further, the frequency verification in the step 3 includes measurement quality verification, point frequency data range verification, frequency point update time verification, multi-frequency point deviation verification, and control area frequency mutation verification.
Further, the step 1 specifically includes:
filling the control area and the frequency measuring points contained in the control area into an AGC database according to a one-to-many hierarchical relationship;
A1) the control zone includes the following attributes: (1) a control area name; (2) an upper frequency limit; (3) a lower frequency limit; (4) maximum deviation among frequency measurement points; (5) the frequency allows a constant time; (6) a current frequency; (7) the last cycle frequency; (8) a frequency mutation threshold; (9) subscripts of initial measuring points in the frequency measuring point chain table;
A2) the frequency measurement points include the following attributes: (1) measuring point names; (2) point subscript: the frequency measuring points in the same control area have unique subscripts; (2) marking the measuring points in the SCADA database; (3) frequency measurement value: measuring values of the frequency measuring points in the SCADA system; (4) a frequency value; (5) whether it is valid; (6) whether the threshold is out of limit; (7) does not change; (8) whether the main measuring point is: the frequency station set as the master station has the highest priority; (9) a priority; (10) measuring the change time; (11) subscript of next measuring point in the frequency measuring point chain table; (12) the use is prohibited.
Further, the step 2 specifically includes: when the attribute of whether any frequency measuring point in the control area is a main measuring point or not or the attribute of priority is changed, arranging the frequency measuring points in the control area according to the following method to form a frequency measuring point chain table of each control area:
B1) initializing subscript attributes of initial measuring points in a frequency measuring point chain table in a control area as set values, and initializing subscript attributes of next measuring points in the frequency measuring point chain table of each frequency measuring point as set values;
B2) traversing the frequency measuring points of the control area, and if the frequency measuring points are marked as main measuring points, recording the subscripts of the frequency measuring points as the first elements of the linked list in the attribute of the subscripts of the initial measuring points in the linked list of the frequency measuring points of the control area;
B3) if the attribute of the subscript of the initial measuring point in the frequency measuring point linked list of the control area is a set value, searching the minimum value of the priority in the frequency measuring point, taking the minimum value as the first element of the linked list, and recording the subscript in the attribute of the subscript of the initial measuring point in the frequency measuring point linked list of the control area;
B4) and adding other frequency measuring points into the frequency measuring point linked list from small to large according to the numerical values of the priority, and recording the subscript of the next measuring point in the linked list on the attribute of the subscript of the next measuring point in the frequency measuring point linked list of the frequency measuring points.
Further, the step 3 specifically includes:
C1) initializing a frequency measuring point: setting the mark of 'effective' or 'out-of-limit' or 'unchanged' of each frequency measuring point to be 0, and setting the frequency value to be an initial value;
C2) obtaining a frequency measurement value, and carrying out measurement quality verification: reading a frequency measurement point value from the SCADA system according to the mark of each measurement point in the SCADA database, comparing the value in the SCADA system at the current moment with the frequency measurement point value recorded in the AGC database, if the variation exceeds a set variation threshold, recording the current moment in the measurement variation time attribute of the frequency measurement point, and recording the measurement point value in the frequency measurement value attribute of the frequency measurement point; if the data quality problem occurs in the corresponding measuring point in the SCADA database, setting the attribute of 'effective or not' of the measuring point as no;
C3) checking the measuring point frequency data range: comparing each frequency measuring point with the upper frequency limit and the lower frequency limit set by the control area to which the frequency measuring point belongs, and if the frequency measuring point is not within the upper frequency limit and the lower frequency limit, setting the property of 'whether the frequency measuring point exceeds the limit' as yes;
C4) checking the updating time of the frequency measuring point: checking the measurement change time attribute value of each frequency measuring point, and if the difference between the time and the current time is greater than the frequency allowable constant time of the control area of the frequency measuring point, setting the 'effective' attribute of the measuring point as no;
C5) checking deviation of multiple frequency measuring points: for the frequency measuring points in each control area, carrying out frequency measuring point deviation verification according to the sequence of the frequency measuring point queues, and ensuring that the deviation between the selected frequency measuring point and most frequency measuring points does not exceed the maximum deviation between the frequency measuring points in the control area; recording the current frequency attribute of the control area in the previous period frequency attribute, and recording the frequency value of the currently selected frequency measuring point in the current frequency attribute of the control area;
C6) and (3) checking the frequency mutation of the control region: comparing the current frequency and the last period frequency of the control area, if the difference between the current frequency and the last period frequency exceeds the frequency mutation threshold of the control area, the frequency mutation of the control area is considered, a frequency mutation alarm of the control area is sent out, and the control area suspends control.
Further, the data quality problem in step C2 includes measurement invalidation and no update.
Further, the calibration of the deviation of the multiple frequency measuring points comprises the following specific steps:
D1) arranging elements with the attribute of 'effective or not' and the attribute of 'forbidden use' and the attribute of 'out-of-limit' in a frequency measuring point chain table of a control area in sequence from small to large (or from large to small) according to frequency values to form a frequency measuring point list F, wherein N is the number of frequency measuring points in F, F (i) represents the ith frequency measuring point in the list, F (i) represents the frequency value of F (i), and id (i) represents the measuring point subscript of F (i);
D2) selecting a frequency measuring point corresponding to the measuring point subscript as a current frequency measuring point f to be checked according to the subscript attribute value of the initial measuring point in the frequency measuring point linked list of the control area;
D3) for the current frequency measuring point f to be checked, if the attribute of 'whether the frequency measuring point is effective' is negative, or the attribute of 'forbid use' is positive, or the attribute of 'whether the frequency measuring point exceeds the limit' is positive, directly entering the step (D6);
D4) finding an item F (n) consistent with the subscript of F in the F, wherein n is the serial number of F in the F;
D5) if it is not
If it is
Or
Taking f as a currently selected frequency measuring point in the control area, and ending the verification process; if it is not
If it is
Or
Then f is taken as controlDistinguishing a currently selected frequency measuring point, and finishing the verification process; if none of the above is satisfied, proceeding to step (D6); wherein, Δ fmaxIs a deviation threshold value;
D6) according to the property of 'subscript of next measuring point in a frequency measuring point chain table' of a frequency measuring point f, if the value is a set value, the condition that all elements in the frequency measuring point chain table are traversed is indicated, the verification process is finished, and the condition that the deviation of the frequency measuring point in a control area is large and no effective frequency measuring point exists is reported, and the control area is paused; otherwise, according to the subscript value, selecting the frequency measuring point corresponding to the measuring point subscript as a new current frequency measuring point f to be verified, and returning to the step (D3) to continue verification.
Further, the set value is-1.
The invention has the beneficial effects that:
(1) the invention has strict logic, safe and reliable used method, and can ensure that the AGC system can correctly acquire the system frequency from a plurality of frequency measuring points by adopting a plurality of checking methods, thereby avoiding the influence of abnormal measurement on AGC control.
(2) Besides the conventional data checking method, a mutual checking mechanism among multiple frequency measuring points is introduced, when the deviation among the frequency measuring points is large, the frequency measuring points with high reliability close to the multiple measuring points are selected, so that the adverse effect caused by frequency measurement with large difference with other measuring points due to inaccurate measurement is avoided, and the AGC system can still accurately acquire the system frequency without pausing or quitting control.
(3) The method can automatically screen the frequency measuring points, can flexibly respond to manual extra intervention, allows a user to designate the frequency measuring points which are selected preferentially by setting the priority, the main measuring points and the like, and helps the system to process the frequency measuring points more accurately through manual experience. When individual frequency measuring point data sources need to be maintained or overhauled, the adverse effect on the system can be avoided in a manual intervention mode.
(4) The multi-frequency measuring point processing method provided by the invention is not influenced by the number of frequency measuring points, has good calculation efficiency, can meet the requirements of AGC real-time calculation and control, and has good universality and practicability.
In a word, the invention can process different numbers of frequency measuring points, the used method has strict logic, safety and reliability, can flexibly respond to manual intervention, and has good safety, flexibility, universality and practicability.
Drawings
FIG. 1 is a flow chart of forming a control zone frequency measurement point linked list;
FIG. 2 is a general flow diagram of a multi-frequency measurement point process;
FIG. 3 is a flow chart of mutual verification of measurement points.
Detailed Description
The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings.
Before processing the frequency measuring points, a mathematical model of the frequency measuring points in the control area needs to be established, and the model has the following characteristics:
1 can describe a one-to-many hierarchical relationship between a control region and the frequency measurement points it contains.
2 the control zone needs to have at least the following properties: (1) a control area name; (2) an upper frequency limit; (3) a lower frequency limit; (4) maximum deviation among frequency measurement points; (5) the frequency allows a constant time; (6) a current frequency; (7) the last cycle frequency; (8) a frequency mutation threshold; (9) subscripts of the starting measurement points in the frequency measurement point chain table.
The 3 frequency measurement points need to have at least the following properties: (1) measuring point names; (2) point subscript: frequency measuring points in the same control area have unique subscript (2) marks of the measuring points in an SCADA database; (3) frequency measurement value: measuring values of the frequency measuring points in the SCADA system; (4) a frequency value; (5) whether it is valid; (6) whether the threshold is out of limit; (7) does not change; (8) whether the main measuring point is: the frequency station set as the master station has the highest priority; (9) a priority; (10) measuring the change time; (11) subscript of next measuring point in the frequency measuring point chain table; (12) the use is prohibited.
As shown in fig. 1, when the attribute of "whether the frequency measurement point is a main measurement point" or "priority" of any frequency measurement point in the control area changes, the frequency measurement points in each control area are arranged according to the following method to form a frequency measurement point chain table of each control area:
(1) the attribute of the subscript of the initial measuring point in the frequency measuring point chain table in the initialization control area is-1, and the attribute of the subscript of the next measuring point in the frequency measuring point chain table in each frequency measuring point is initialized to-1;
(2) traversing the frequency measuring points of the control area, and if the frequency measuring points are marked as main measuring points, recording the subscripts of the frequency measuring points as the first elements of the linked list in the attribute of the subscripts of the initial measuring points in the linked list of the frequency measuring points of the control area;
(3) if the attribute of the subscript of the initial measuring point in the frequency measuring point linked list in the control area is-1, searching the minimum value of the priority in the frequency measuring point, taking the minimum value as the first element of the linked list, and recording the subscript in the attribute of the subscript of the initial measuring point in the frequency measuring point linked list in the control area;
(4) and adding other frequency measuring points into the frequency measuring point linked list from small to large according to the numerical values of the priority, and recording the subscript of the next measuring point in the linked list on the attribute of the subscript of the next measuring point in the frequency measuring point linked list of the frequency measuring points.
As shown in fig. 2, in each AGC execution cycle, the multiple frequency measurement points are processed for each control zone according to the following steps:
1) initializing a frequency measuring point: the mark of ' effective or not ', ' out-of-limit ' or not changed ' of each frequency measuring point is set to 0, and the frequency value is set to 0.
2) Obtaining a frequency measurement value, and carrying out measurement quality verification: reading a frequency measurement point value from the SCADA system according to the mark of each measurement point in the SCADA database, comparing the value in the SCADA system at the current moment with the frequency measurement point value recorded in the AGC database, if the variation exceeds a variation threshold (usually 0.0001), recording the current moment in the measurement variation time attribute of the frequency measurement point, and recording the measurement point value in the frequency measurement value attribute of the frequency measurement point; and if the data quality problem (generally comprising measurement invalidity, no updating and the like) occurs to the corresponding measuring point in the SCADA database, setting the attribute of 'validity' of the measuring point to be no.
3) Checking the measuring point frequency data range: and comparing each frequency measuring point with the upper frequency limit and the lower frequency limit set in the control area to which the frequency measuring point belongs, and if the frequency measuring point is not within the upper frequency limit and the lower frequency limit, setting the property of 'whether the frequency measuring point exceeds the limit' as yes.
4) Checking the updating time of the frequency measuring point: and checking the measurement change time attribute value of each frequency measuring point, and if the difference between the time and the current time is greater than the frequency allowable constant time of the control area of the frequency measuring point, setting the 'effective' attribute of the measuring point as 'no'.
5) Checking deviation of multiple frequency measuring points: for the frequency measuring points in each control area, carrying out frequency measuring point deviation verification according to the sequence of the frequency measuring point queues, and ensuring that the deviation between the selected frequency measuring point and most frequency measuring points does not exceed the maximum deviation between the frequency measuring points in the control area; and recording the current frequency attribute of the control area in the previous period frequency attribute, and recording the frequency value of the currently selected frequency measuring point in the current frequency attribute of the control area.
6) And (3) checking the frequency mutation of the control region: comparing the current frequency and the last period frequency of the control area, if the difference between the current frequency and the last period frequency exceeds the frequency mutation threshold of the control area, the frequency mutation of the control area is considered, a frequency mutation alarm of the control area is sent out, and the control area suspends control.
The multi-frequency measuring point deviation checking is carried out according to the following steps:
D1) arranging the elements with the attribute of 'effective' or not, the attribute of 'forbidden use' or not and the attribute of 'out-of-limit' or not in the frequency measuring point chain table of the control area from small to large (or from large to small) according to the frequency values to form a frequency measuring point list F, wherein N is the number of frequency measuring points in F, F (i) represents the ith frequency measuring point in the list, F (i) represents the frequency value of F (i), and id (i) represents the measuring point subscript of F (i).
D2) And selecting the frequency measuring point corresponding to the measuring point subscript as the current frequency measuring point f to be verified according to the 'subscript of the initial measuring point in the frequency measuring point linked list' attribute value in the control area.
D3) For the current frequency measuring point f to be checked, if the attribute of "whether the frequency measuring point is valid" is no, or the attribute of "forbid use" is yes, or the attribute of "whether the frequency measuring point exceeds the limit" is yes, the procedure directly goes to step (D6).
D4) And finding an item F (n) consistent with the subscript of F in the F, wherein n is the serial number of F in the F.
D5) If it is not
If it is
Or
Taking f as a currently selected frequency measuring point in the control area, and ending the verification process; if it is not
If it is
Or
And f is used as the currently selected frequency measuring point in the control area, and the verification process is finished. If none of the above is satisfied, step (D6) is entered.
D6) According to the property of 'subscript of next measuring point in a frequency measuring point chain table' of a frequency measuring point f, if the value is-1, the condition that all elements in the frequency measuring point chain table are traversed is indicated, the verification process is ended, and the condition that the frequency measuring point deviation of a control area is large and no effective frequency measuring point exists is reported, and the control area is paused to control is reported; otherwise, according to the subscript value, selecting the frequency measuring point corresponding to the measuring point subscript as a new current frequency measuring point f to be verified, and returning to the step (D3) to continue verification.
This method is illustrated in fig. 3.
The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A processing method of multi-frequency measuring points in an automatic power generation control system is characterized by comprising the following steps:
step 1, establishing a frequency measuring point model of a control area, comprising the following steps:
filling the control area and the frequency measuring points contained in the control area into an AGC database according to a one-to-many hierarchical relationship;
A1) the control zone includes the following attributes: (1) a control area name; (2) an upper frequency limit; (3) a lower frequency limit; (4) maximum deviation among frequency measurement points; (5) the frequency allows a constant time; (6) a current frequency; (7) the last cycle frequency; (8) a frequency mutation threshold; (9) subscripts of initial measuring points in the frequency measuring point chain table;
A2) the frequency measurement points include the following attributes: (1) measuring point names; (2) point subscript: the frequency measuring points in the same control area have unique subscripts; (3) marking the measuring points in the SCADA database; (4) frequency measurement value: measuring values of the frequency measuring points in the SCADA system; (5) a frequency value; (6) whether it is valid; (7) whether the threshold is out of limit; (8) does not change; (9) whether the main measuring point is: the frequency station set as the master station has the highest priority; (10) a priority; (11) measuring the change time; (12) subscript of next measuring point in the frequency measuring point chain table; (13) forbidding use
Step 2, when the key attribute of any frequency measuring point in the control area changes, the frequency measuring points in the control area are arranged according to the priority to form a frequency measuring point chain table of each control area, which comprises the following steps:
when the attribute of whether any frequency measuring point in the control area is a main measuring point or not or the attribute of priority is changed, arranging the frequency measuring points in the control area according to the following method to form a frequency measuring point chain table of each control area:
B1) initializing subscript attributes of initial measuring points in a frequency measuring point chain table in a control area as set values, and initializing subscript attributes of next measuring points in the frequency measuring point chain table of each frequency measuring point as set values;
B2) traversing the frequency measuring points of the control area, and if the frequency measuring points are marked as main measuring points, recording the subscripts of the frequency measuring points as the first elements of the linked list in the attribute of the subscripts of the initial measuring points in the linked list of the frequency measuring points of the control area;
B3) if the attribute of the subscript of the initial measuring point in the frequency measuring point linked list of the control area is a set value, searching the minimum value of the priority in the frequency measuring point, taking the minimum value as the first element of the linked list, and recording the subscript in the attribute of the subscript of the initial measuring point in the frequency measuring point linked list of the control area;
B4) adding other frequency measuring points into the frequency measuring point linked list from small to large according to the numerical value of the priority, and recording the subscript of the next measuring point in the linked list on the attribute of the subscript of the next measuring point in the frequency measuring point linked list of the frequency measuring points;
and 3, in each AGC execution period, carrying out initialization frequency measurement points, frequency measurement value acquisition and frequency verification processing on the multi-frequency measurement points in each control area.
2. The method for processing multiple frequency stations in an automatic power generation control system as claimed in claim 1, wherein the key attribute in step 2 is "whether it is a main station" or "priority" attribute.
3. The method for processing multiple frequency measuring points in an automatic power generation control system as claimed in claim 1, wherein the frequency verification in step 3 comprises measurement quality verification, measuring point frequency data range verification, frequency measuring point update time verification, multiple frequency measuring point deviation verification, and control area frequency mutation verification.
4. The method as claimed in claim 1, wherein the step 3 comprises:
C1) initializing a frequency measuring point: setting the mark of 'effective' or 'out-of-limit' or 'unchanged' of each frequency measuring point to be 0, and setting the frequency value to be an initial value;
C2) obtaining a frequency measurement value, and carrying out measurement quality verification: reading a frequency measurement point value from the SCADA system according to the mark of each measurement point in the SCADA database, comparing the value in the SCADA system at the current moment with the frequency measurement point value recorded in the AGC database, if the variation exceeds a set variation threshold, recording the current moment in the measurement variation time attribute of the frequency measurement point, and recording the measurement point value in the frequency measurement value attribute of the frequency measurement point; if the data quality problem occurs in the corresponding measuring point in the SCADA database, setting the attribute of 'effective or not' of the measuring point as no;
C3) checking the measuring point frequency data range: comparing each frequency measuring point with the upper frequency limit and the lower frequency limit set by the control area to which the frequency measuring point belongs, and if the frequency measuring point is not within the upper frequency limit and the lower frequency limit, setting the property of 'whether the frequency measuring point exceeds the limit' as yes;
C4) checking the updating time of the frequency measuring point: checking the measurement change time attribute value of each frequency measuring point, and if the difference between the time and the current time is greater than the frequency allowable constant time of the control area of the frequency measuring point, setting the 'effective' attribute of the measuring point as no;
C5) checking deviation of multiple frequency measuring points: for the frequency measuring points in each control area, carrying out frequency measuring point deviation verification according to the sequence of the frequency measuring point queues, and ensuring that the deviation between the selected frequency measuring point and most frequency measuring points does not exceed the maximum deviation between the frequency measuring points in the control area; recording the current frequency attribute of the control area in the previous period frequency attribute, and recording the frequency value of the currently selected frequency measuring point in the current frequency attribute of the control area;
C6) and (3) checking the frequency mutation of the control region: comparing the current frequency and the last period frequency of the control area, if the difference between the current frequency and the last period frequency exceeds the frequency mutation threshold of the control area, the frequency mutation of the control area is considered, a frequency mutation alarm of the control area is sent out, and the control area suspends control.
5. The method as claimed in claim 4, wherein the data quality problem in step C2 includes measurement invalidation and no update.
6. The method for processing the multiple frequency measuring points in the automatic power generation control system as claimed in claim 4, wherein the calibration of the deviation of the multiple frequency measuring points comprises the following steps:
D1) arranging elements with the attribute of 'effective or not' and the attribute of 'forbidden use' and the attribute of 'out-of-limit' in a frequency measuring point chain table of a control area in sequence from small to large (or from large to small) according to frequency values to form a frequency measuring point list F, wherein N is the number of frequency measuring points in F, F (i) represents the ith frequency measuring point in the list, F (i) represents the frequency value of F (i), and id (i) represents the measuring point subscript of F (i);
D2) selecting a frequency measuring point corresponding to the measuring point subscript as a current frequency measuring point f to be checked according to the subscript attribute value of the initial measuring point in the frequency measuring point linked list of the control area;
D3) for the current frequency measuring point f to be checked, if the attribute of 'whether the frequency measuring point is effective' is negative, or the attribute of 'forbid use' is positive, or the attribute of 'whether the frequency measuring point exceeds the limit' is positive, directly entering the step (D6);
D4) finding an item F (n) consistent with the subscript of F in the F, wherein n is the serial number of F in the F;
D5) if it is not
If it is
Or
Taking f as a currently selected frequency measuring point in the control area, and ending the verification process; if it is not
If it is
Or
Taking f as a currently selected frequency measuring point in the control area, and ending the verification process; if none of the above is satisfied, proceeding to step (D6); wherein, Δ fmaxIs a deviation threshold value;
D6) according to the property of 'subscript of next measuring point in a frequency measuring point chain table' of a frequency measuring point f, if the value is a set value, the condition that all elements in the frequency measuring point chain table are traversed is indicated, the verification process is finished, and the condition that the deviation of the frequency measuring point in a control area is large and no effective frequency measuring point exists is reported, and the control area is paused; otherwise, according to the subscript value, selecting the frequency measuring point corresponding to the measuring point subscript as a new current frequency measuring point f to be verified, and returning to the step (D3) to continue verification.
7. The method for processing multiple frequency measurement points in an automatic power generation control system as claimed in any one of claims 1 or 6, wherein said set value is-1.
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