CN102195291A - Automatically identifying control method for main transformer overload joining-cutting load based on running mode - Google Patents
Automatically identifying control method for main transformer overload joining-cutting load based on running mode Download PDFInfo
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- CN102195291A CN102195291A CN2011101280345A CN201110128034A CN102195291A CN 102195291 A CN102195291 A CN 102195291A CN 2011101280345 A CN2011101280345 A CN 2011101280345A CN 201110128034 A CN201110128034 A CN 201110128034A CN 102195291 A CN102195291 A CN 102195291A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
An automatically identifying control method for main transformer overload joining-cutting load based on a running mode comprises the following steps of: automatically identifying the running mode of a bus according to bus connecting switch state information and separated running pressing plate information; identifying the running mode of a main transformer according to main transformer knife brake position information by combining the running mode of the bus; automatically identifying a running mode of a load circuit according to the knife brake position information of the load circuit; calculating power algebras of a main transformer medium voltage side and the load circuit running in the same bus and the corresponding node power unbalance, and checking the identification result of the running mode; detecting the main transformer overload and determining the load to be cut according to the overload degree; and cutting the load circuits from the load circuits meeting the cutting conditions according to a cutting priority. By the method, the running mode of a transformer substation is automatically identified, so that the load cutting accuracy and effectiveness of a main transformer overload joining-cutting device are ensured.
Description
Technical field
The invention belongs to power system automatic field, relate more specifically to a kind of main transformer overload connection cutting load control method of discerning automatically based on operational mode.
Background technology
Electrical network is as the tie that connects between power supply and the user, and its effect is exactly electric energy safe that power supply is sent, high-quality, is transported to the user economically.Transformer station is the circuit tie point in the electrical network, is used for the flow direction of voltage of transformation, acceptance and distribution electric energy, control electric power and the electric power facility of adjustment voltage.For the safety that guarantees to power with reliable, generally all install 2 or 3 transformers.Along with the fast development of local economy, many area power grid loads increase fast, and in order to ensure the reliability of electricity consumption, a lot of electrical networks have adopted the mode of 220kV main transformer medium voltage side paired running, are called for short many main transformers paired running mode.Therefore, cut because of internal fault or other reason when a certain transformer, load will all be transferred on the other transformer.At this moment, the serious harm device security serious overload may appear, in the transformer of residue operation.Guarantee that by restriction main transformer institute on-load the mode of device security has seriously fettered the serviceability of equipment, do not give full play to utilization rate of equipment and installations, and caused unnecessary waste.And the application of main transformer overload connection cutting load control device, can break down at any main transformer of paired running out of service after, the sub-load of urgent excision residue operation main transformer is guaranteed its safe operation.
At home and abroad the overload Union Switch Device is existing at present uses, but actual application is found shortcoming of ubiquity, i.e. adaptive system operational mode automatically, after changes of operating modes, may wrongly excise should be not cut the sub-load circuit; For avoiding excising the load circuit that should not excise, then need repeatedly artificial modification definite value or throwing to move back a large amount of pressing plates, make operation and maintenance work become very loaded down with trivial details.
Summary of the invention
In order to overcome this defective, be primarily aimed at transformer station's load side and adopt the double bus scheme mode, 2 or many main transformer medium voltage sides may be listed in the situation of same bus, the present invention proposes a kind of main transformer overload connection cutting load control method of discerning automatically based on operational mode, discern by bus running manner, technology such as identification of main transformer operational mode and the identification of load circuit operational mode, automatically judge the substation operation mode, and according to operational mode recognition result and main transformer overload situations, generate corresponding connection cutting load control strategy by the prioritization method, thereby guarantee the accuracy and the validity of main transformer overload Union Switch Device excision load.
A kind of main transformer overload connection cutting load control method of discerning automatically based on operational mode, being used for the transformer station load side adopts double bus scheme mode, 2 or many main transformer medium voltage sides to be listed in the situation of same bus, it is characterized in that described method comprises the steps:
One, discerns bus running manner automatically according to bus connection switch state information and fanout operation pressing plate information;
Two, according to main transformer disconnecting link positional information, the bus running manner recognition result that integrating step one obtains is discerned the main transformer operational mode automatically;
Three, according to load circuit disconnecting link positional information, the main transformer operational mode of bus running manner that while integrating step one obtains and step 2 identification, identification load circuit operational mode automatically;
Four, calculate main transformer medium voltage side of discerning according to step 1 to three that runs on same bus and the power algebraical sum of loading circuit, the i.e. pairing node power amount of unbalance of this bus, by judging that whether the power amount of unbalance is less than the uneven locking definite value of the power of setting, recognition result to step 1 to three is checked, if described power algebraical sum is less than the power amount of unbalance locking definite value of setting, then the recognition result of determining step one to three is correct;
Five, main transformer overload detection and determine load to be excised according to the overload degree, power deducted main transformer operating power definite value when load described to be excised equaled main transformer overload action;
Six, from the overload main transformer run on same bus and with the load circuit of overload main transformer connection bus parallel running select the cutting load circuit according to predefined excision priority.
Further, in step 1, when mother's connection " fanout operation pressing plate " dropped into, then bus running manner was a fanout operation.If female connection " fanout operation pressing plate " withdraws from, then judge bus running manner according to the closing position contact information of bus connection switch, HWJ is 0 when bus connection switch closing position contact point signal, and bus connection switch trip position contact point signal TWJ is 1 o'clock, then bus running manner is a fanout operation, otherwise is bus paired running mode.
In step 2, if being in, the disconnecting link of main transformer and I parent phase connection closes the position, then this main transformer runs on mother I, otherwise runs on mother II; In conjunction with the automatic recognition result of bus running manner, judge the main transformer that has the paired running relation.
In step 3, close the position if the disconnecting link that load circuit and I parent phase connect is in, and be in the branch position with II parent phase disconnecting link even, then this load circuit runs on mother I, otherwise runs on mother II; In conjunction with the automatic recognition result of bus running manner and main transformer operational mode, judge the load circuit that runs under the paired running main transformer.The invention has the beneficial effects as follows by automatic identification the substation operation mode; select tripping and overload main transformer to be in the load circuit of same bus; the accuracy and the validity of main transformer overload Union Switch Device excision load have finally been guaranteed; avoid the mistake cutting load, thereby will protect the cost of main transformer to be reduced to minimum.
Description of drawings
Fig. 1 is based on the operational mode main transformer overload connection cutting load control method flow chart of identification automatically;
Fig. 2 is certain many main transformers paired running system wiring schematic diagram;
Fig. 3 is bus running manner decision logic figure;
Fig. 4 is that the load circuit can excise decision logic figure;
Fig. 5 is that the main transformer overload starts and action logic figure.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
The inventive method is primarily aimed at transformer station's load side and adopts double bus scheme mode (being designated as female and mother II of I respectively), 2 or many main transformer medium voltage sides may be listed in the situation of same bus, use bus fanout operation pressing plate information, (abbreviation closes the position and connects bus connection switch closing position contact, be designated as HWJ) and the trip position contact (be called for short jumping the position connects, be designated as TWJ) signal, the main transformer medium voltage side first and second disconnecting link positional informations, the load line first and second disconnecting link positional informations, discern by bus running manner, technology such as identification of main transformer operational mode and the identification of load circuit operational mode, automatically judge the substation operation mode, and, generate corresponding connection cutting load control strategy by the prioritization method according to operational mode recognition result and main transformer overload situations.
Fig. 1 is based on the operational mode main transformer overload connection cutting load control method flow chart of identification automatically.Variation along with system operation mode, device can adapt to the variation of operational mode automatically, when main transformer generation overload can determine accurately under this main transformer with load line which is arranged, when taking control measure excision load line, can effectively control, be unlikely to excise eliminating the useless load line of overload.
Each link specific design step of the inventive method is as follows:
The position connects the HWJ signal to female the closing of joining of the inventive method collection and the jumping position connects the TWJ signal, and the branch paired running situation of medium voltage side bus is judged in combination " fanout operation pressing plate " jointly.When " fanout operation pressing plate " dropped into, device was judged as the female and II mother stock row operation of I.When device " fanout operation pressing plate " when withdrawing from, judge with the state of the HWJ of mother's connection and TWJ to be as the criterion, as HWJ with TWJ exists or when not existing, press the female and female processing side by side of II of I and alarm decision logic such as Fig. 2.The specific implementation step is described below:
(1), judges whether female connection " fanout operation pressing plate " drops into;
(2) if " fanout operation pressing plate " drops into, then bus running manner is the female and II mother stock row operation of I, and deterministic process finishes; If " fanout operation pressing plate " withdraws from, then the position of closing according to bus connection switch meets HWJ and jumps the position and connects TWJ information and judge, changes step 3;
(3) if HWJ be 0 and TWJ be 1, then bus running manner is the female and II mother stock row operation of I, other situations are the female and II mother paired running of I;
(4) if HWJ and TWJ are all 1 or be all 0, then send alarm simultaneously.
With certain many main transformers paired running system shown in Figure 3 is embodiment, and bus " fanout operation pressing plate " withdraws from, and bus connection switch closes the position to meet HWJ be 0 and jumps the position to meet TWJ be 1, shows that bus is in the female and II mother stock row operational mode of I.
The inventive method judges that according to main transformer disconnecting link positional information the main transformer medium voltage side operates in mother I/II, and in conjunction with the operational mode of bus, judges the concrete condition of 3 main transformer medium voltage side paired runnings, sees Table 1, and the specific implementation step is described below:
(1), obtains the disconnecting link positional information of respectively moving main transformer respectively;
(2) if be in the disconnecting link of I parent phase connection and close the position, then this main transformer runs on mother I, otherwise runs on mother II;
(3) in conjunction with the automatic recognition result of bus running manner, judge the main transformer that has the paired running relation.
Table 1 main transformer operational mode table
In conjunction with transformer station's winding diagram shown in Figure 3, the first disconnecting link of 1# main transformer closes in mother I, and the second disconnecting link of 2# main transformer closes in mother II, and the first disconnecting link of 3# main transformer closes in mother I, judges that then 1# main transformer and 3# main transformer run on mother I, and the 2# main transformer runs on mother II.Load will be transferred on another operation main transformer when the tripping operation fault takes place for one of 1# main transformer and 3# main transformer, may cause this residue main transformer seriously to transship, and need excision load in time, can keep safe operation to guarantee the residue main transformer.
The inventive method judges that according to load circuit disconnecting link positional information the load circuit operates in mother I/II, and in conjunction with the operational mode of main transformer, judges the load circuit situation that links to each other with main transformer, sees Table 2, and the specific implementation step is described below:
(1), obtains the disconnecting link positional information of each operating load circuit respectively;
(2) if be in the disconnecting link of I parent phase connection and close the position, then this load circuit runs on mother I, otherwise runs on mother II;
(3) in conjunction with the automatic recognition result of bus running manner and main transformer operational mode, judge the load circuit that runs under the paired running main transformer.
Table 2 load line operational mode table
Load circuit operational mode recognition result can be used for judging whether the load circuit possesses the condition of can excising, and as Fig. 4, specifically describes as follows:
(1), when definition load circuit active power direction flows out the medium voltage side bus when being positive direction, the power of measurement device is greater than 0.
(2), load line put into operation (power is greater than a certain power definite value, and preferred here this definite value is 5MW).
(3), this load line should hang over same bus with the overload main transformer during middle pressure bus fanout operation, press the bus paired running in perhaps.
In conjunction with transformer station shown in Figure 3 winding diagram, the first disconnecting link of 1# load circuit closes in mother I, and the second disconnecting link of 2# load circuit closes in mother II, judge that then 1# load circuit runs on mother I with 1# main transformer and 3# main transformer, and 2# load circuit runs on mother II with the 2# main transformer.Excision 1# load circuit will help elimination to transship when 1# main transformer or 3# main transformer appearance overload, and excision 2# load circuit does not have effect for eliminating to transship.Equally, if 2# main transformer overload then excises 2# load circuit and will help to eliminate overload, and excision 1# load circuit does not have effect for eliminating overload.
For preventing wrong excision load line, when load line is judged to be when putting into operation, device detects the first disconnecting link of load line and the second disconnecting link exists simultaneously or do not exist simultaneously, and phenomenon continues 5 seconds, device is sent out this load line disconnecting link malposition alarm, but gets rid of this line in the cutting load circuit.
Whether step 4, calculating run on the main transformer medium voltage side of same bus and the pairing node power amount of unbalance of power algebraical sum of load circuit,, less than locking power threshold value the operational mode recognition result is checked by judging the power amount of unbalance.
For preventing that the disconnecting link positional fault from causing device mistake excision load circuit, the present invention uses the node power amount of unbalance that the operational mode recognition result is carried out verification.According to Kirchhoff's current law (KCL) as can be known, the injection current sum of same node is 0.Be generalized to the power notion, when definition power outflow bus was positive direction, the injecting power algebraical sum that node is then arranged was 0.In case transformer station's mode of connection misjudgment, then causing the injecting power algebraical sum is not 0, and shows as bigger power amount of unbalance of existence.
But because the existence of measure error, node injecting power algebraical sum is not 0, shows as to have a less power amount of unbalance yet.Therefore when using the power amount of unbalance that the operational mode recognition result is tested power amount of unbalance locking definite value need be set rationally, representative value is preferably 10% of load line power algebraical sum here.
In the middle of when pressing the side bus fanout operation, the inventive method is calculated the power amount of unbalance of the power algebraical sum correspondence of main transformer medium voltage side power on mother I (mother II) and all load line powers in real time, when mother I (mother II) power amount of unbalance more than or equal to " mother I (mother II) power uneven locking definite value ", and continue 5 second time, to send out " mother I (mother II) power amount of unbalance is unusual " alarm, and locking device.The specific implementation step is described below:
(1), utilize the recognition result of bus, main transformer and load circuit operational mode, calculate the main transformer medium voltage side power and the algebraical sum of load line power, i.e. mother I (mother II) the power amount of unbalance that run on mother I (mother II);
(2), compare mother I (mother II) power amount of unbalance and " the uneven locking definite value of mother I (mother II) power ";
(3) if, showing the operational mode recognition result less than the uneven locking definite value of power, the power amount of unbalance can use;
(4) if the power amount of unbalance more than or equal to the uneven locking definite value of power, shows that the operational mode recognition result is unavailable, device will send alarm and locking.
Step 5, main transformer overload detection are also determined load to be excised according to the overload degree.
The inventive method detects the main transformer running status in real time, and determines load accordingly to be excised according to the different orders of severity of overload, and as Fig. 5, concrete implementation step is as follows:
(1), determine positive direction overload, in the other direction overload, do not declare overload detection mode such as direction overload.
(2), overload starts, criterion is
Wherein: I is an element primary current value; Iqd is a starting current value definite value; P is real-time active power; Pqd is a power starting setting value; T is a time counter; Tqd is definite value start-up time.
(3), determine load to be excised, power P-main transformer operating power definite value Pdz when waiting to excise load Pt=main transformer overload action.
In the present embodiment, suppose that main transformer overload action moment power is P=660MW, overload operating power definite value is Pdz=500MW, then waits to excise load Pt=660-500=160MW.
Step 6, from the load circuit that satisfies the condition of to excise, select the cutting load circuit according to excision priority.
Because measure error causes occurring two groups of these problems of cutting load strategy that difference is very big under stabilized control system two covering devices, the inventive method is preferably used the method for carrying out combination selection by circuit priority in order to overcome.Concrete steps are as follows:
(1), determine load circuit priority 1～N, priority 1 is represented cut at first, priority 2 secondly, priority N represents cut at last, and the circuit of will loading according to priority sorts, and then its priority is put 0 for circuit that can not be cut;
(2), obtaining step five obtains waits to excise load Pt;
(3), actual excision amount Psum=0, i=1;
(4) but, from the tangent line road tabulation after the ordering, select the power P i of i circuit, Psum=Psum+Pi;
(5), if Psum 〉=Pt, then stop to calculate, excision is numbered the load circuit of 1～i; Otherwise i=i+1 changes step 4.
In the present embodiment, suppose operate power and the priority such as the table 3 of load circuit.
Table 3 load line power and priority list
| The load |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| The priority of adjusting | 1 | 0 | 1 | 2 | 3 | 3 | 4 | 5 | 6 | 0 |
| Load power (MW) | 20 | 20 | 40 | 35 | 30 | 40 | 30 | 36 | 25 | 40 |
In the present embodiment, load=the 160MW to be excised that obtains according to step 5, the load line number of selecting by excision priority method is 1,3,4,5,6, and corresponding actual excision power is 20+40+35+30+40=165MW, and load excision back main transformer overload phenomenon is eliminated.
Above embodiment is in order to illustrate that the inventive method is by technology such as bus running manner identification, the identification of main transformer operational mode and the identifications of load circuit operational mode, automatically judge the substation operation mode, and according to operational mode recognition result and main transformer overload situations, generate corresponding connection cutting load control strategy by the prioritization method, guaranteed the accuracy and the validity of main transformer overload Union Switch Device excision load.
Claims (7)
1. a main transformer overload of discerning automatically based on operational mode joins the cutting load control method, being used for the transformer station load side adopts double bus scheme mode, 2 or many main transformer medium voltage sides to be listed in the situation of same bus, it is characterized in that described method comprises the steps:
One, discerns bus running manner automatically according to bus connection switch state information and fanout operation pressing plate information;
Two, according to main transformer disconnecting link positional information, the bus running manner recognition result that integrating step one obtains is discerned the main transformer operational mode automatically;
Three, according to load circuit disconnecting link positional information, the main transformer operational mode of bus running manner that while integrating step one obtains and step 2 identification, identification load circuit operational mode automatically;
Four, calculate main transformer medium voltage side of discerning according to step 1 to three that runs on same bus and the power algebraical sum of loading circuit, the i.e. pairing node power amount of unbalance of this bus, by judging that whether the power amount of unbalance is less than the uneven locking definite value of the power of setting, recognition result to step 1 to three is checked, if described power algebraical sum is less than the power amount of unbalance locking definite value of setting, then the recognition result of determining step one to three is correct;
Five, main transformer overload detection and determine load to be excised according to the overload degree, power deducted main transformer operating power definite value when load described to be excised equaled main transformer overload action;
Six, from the overload main transformer run on same bus and with the load circuit of overload main transformer connection bus parallel running select the cutting load circuit according to predefined excision priority.
2. the main transformer overload connection cutting load control method of discerning automatically based on operational mode according to claim 1 is characterized in that: in step 1, when mother's connection " fanout operation pressing plate " drops into, judge that then bus running manner is a fanout operation.
3. the main transformer overload connection cutting load control method of discerning automatically based on operational mode according to claim 2, it is characterized in that: if female connection " fanout operation pressing plate " withdraws from, then judge bus running manner according to the closing position contact information of bus connection switch, HWJ is 0 when bus connection switch closing position contact point signal, and bus connection switch trip position contact point signal TWJ is 1 o'clock, then bus running manner is a fanout operation, otherwise is bus paired running mode.
4. the main transformer overload connection cutting load control method of discerning automatically based on operational mode according to claim 1, it is characterized in that: in step 2, close the position if the disconnecting link of main transformer and I parent phase connection is in, then this main transformer runs on mother I, otherwise runs on mother II; In conjunction with the automatic recognition result of bus running manner, judge the main transformer that has the paired running relation.
5. the main transformer overload connection cutting load control method of discerning automatically based on operational mode according to claim 1, it is characterized in that: in step 3, if being in, the disconnecting link that load circuit and I parent phase connect closes the position, and be in the branch position with II parent phase disconnecting link even, then this load circuit runs on mother I, otherwise runs on mother II; In conjunction with the automatic recognition result of bus running manner and main transformer operational mode, judge the load circuit that runs under the paired running main transformer.
6. the main transformer overload connection cutting load control method of discerning automatically based on operational mode according to claim 1, it is characterized in that: in step 4, if described power algebraical sum is greater than the power amount of unbalance locking definite value of setting, then the recognition result of determining step one to three is unavailable, and stability control device will send alarm and locking controlled function.
7. according to claim 1 or the 6 described main transformer overload connection cutting load control methods of discerning automatically based on operational mode, it is characterized in that: described power amount of unbalance locking definite value is preferably 10% of load line power algebraical sum.
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| CN104638769A (en) * | 2015-02-12 | 2015-05-20 | 广东电网有限责任公司电力调度控制中心 | Load shedding method and system for safety automatic device based GOOSE information |
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